Abstract:
Disclosed is a structure such that when pad clips are to be mounted, it is possible to handle return springs and the pad clips as integral articles, thereby facilitating mounting work. Constraining sections are provided at both axial ends of each of the pad clips. Furthermore, the return springs are composed of inner spring elements and outer spring elements. These two types of spring elements are helical torsion springs provided with helical sections. Abutting sections are provided on the spring elements, respectively. The abutting sections are pressed against the inner surfaces of the constraining sections by elastic restoring forces. Moreover, the central axes of the coil sections are substantially oriented in the rotational direction of the rotor.

Description:
TECHNICAL FIELD 
     The invention relates to a floating disc brake, a method of assembling the same and an assembly of a pad clip and a return spring capable of smoothly returning a pad upon braking release to thus prevent friction between a lining of the pad and a side surface of a rotor upon non-braking, efficiently reducing a drag of the rotor upon non-braking and wear of the lining, improving assembling performance and reducing assembling cost. 
     BACKGROUND ART 
     Regarding a disc brake for braking a vehicle such as automobile, a floating disc brake has been widely known and has been actually used which supports a caliper so that it can displace in an axial direction (in the specification and the claims, an ‘axial direction’, a ‘diametrical direction’ and a ‘circumferential direction’ means an ‘axial direction’, a ‘diametrical direction’ and a ‘circumferential direction’ of a rotor, respectively) with respect to a support. 
       FIG. 57  shows a floating disc brake, which is a first example of the prior art disclosed in PTL1. The floating disc brake displaces a caliper  2  with respect to a rotor  1  rotating together with a wheel (not shown), upon braking. At a state where the brake is mounted to a vehicle, a support  3  that is provided in the vicinity of one side of the rotor  1  in an axial direction is fixed to a vehicle body (not shown). Also, the caliper  2  is supported to the support  3  so as to be axially displaceable. 
     Therefore, a pair of guide pins  4  that is provided at both end portions of the caliper  2  in a circumferential direction and a pair of guide holes  5  that is provided at both end portions of the support  3  in a circumferential direction are provided in parallel with a central axis of the rotor  1 , respectively. The guide pins  4  are axially slidably inserted into the guide holes  5 . Boots  6 ,  6 , for dust-proof are provided between outer peripheries of base end portions of the guide pins  4  and openings of the guide holes  5 . 
     Also, at both end portions of the support  3 , rotation input side and rotation output side engaging sections  7 ,  8  are respectively provided at parts spaced from the rotor  1  in the circumferential direction. Both circumferential end portions of pressure plates  10   a ,  10   b  configuring pads  9   a ,  9   b  are engaged with the engaging sections  7 ,  8 . Also, the caliper  2  having a cylinder section  11  and a claw section  12  is arranged so that it extends over the both the pads  9   a ,  9   b . Also, the cylinder section  11  is fluid-tightly fitted with a piston  13  that presses the inner (upper side in  FIG. 57  at a widthwise inner side of the vehicle) pad  9   a  to the rotor  1 . 
     When braking the vehicle, a pressure oil is supplied into the cylinder section  11 , so that a lining  14   a  of the inner pad  9   a  is pressed to an inner surface of the rotor  1  from the upper to the lower in  FIG. 57  by the piston  13 . Thus, as a reaction to the pressing force, the caliper  2  is displaced upward in  FIG. 57 , based on the sliding between the guide pins  4  and the guide holes  5 , and the claw section  12  presses a lining  14   b  of the outer (lower side in  FIG. 57  at a widthwise outer side of the vehicle) pad  9   b  to an outer surface of the rotor  1 . As a result, the rotor  1  is strongly held from both inner and outer side surfaces, so that the braking is made. 
     Upon the non-braking of the disc brake configured and operating as described above, when the linings  14   a ,  14   b  of the respective pads  9   a ,  9   b  and the inner and outer side surfaces of the rotor  1  rub each other, drag torque (rotation resistance) of the rotor  1  is increased, so that the gas mileage performance is lowered and the linings  14   a ,  14   b  are unnecessarily worn. The unnecessary wear of the linings  14   a ,  14   b  lowers a mileage until the respective pads  9   a ,  9   b  are replaced, so that the driving cost is increased. 
     In order to solve the above problem, for example, PTLs 2 to 4 disclose a structure where a return spring is provided between the inner and outer pads and friction surfaces of the linings of the pads are separated from both side surfaces of the rotor as the braking is released.  FIG. 58  shows a second example of the prior art disclosed in PTL2. 
     In the second example, between the support  3  and the pads  9   a ,  9   b , a pad clip  15  for preventing the pads  9   a ,  9   b  from rattling is provided and a return spring  16  for applying an elastic urging force (returning force) to the pads  9   a ,  9   b  in a direction getting away from each other is provided. The return spring  16  has a substantial M shape that is a whole shape, and has a coil section  17  at a central portion thereof in an axial direction. Both end portions of the return spring  16  are engaged into engaging holes  18 ,  18  that are formed on outer peripheral edges of circumferential end portions of the pressure plates  10   a ,  10   b , and the coil section  17  is engaged to a protruding pin  19  extending from an upper end edge of the pad clip  15 . By the configuration as described above, the elastic urging force is applied to the pads  9   a ,  9   b  in the direction getting away from each other. Hence, upon the braking release, friction surfaces of the linings  14   a ,  14   b  of the pads  9   a ,  9   b  are separated from both side surfaces of the rotor  1 . 
     In the second example of the prior art, upon the non-braking, it is possible to prevent the friction between the linings  14   a ,  14   b  of the pads  9   a ,  9   b  and the side surfaces of the rotor. However, the assembling operation is troublesome and the assembling cost is thus increased. That is, in the second example, it is not possible to support the return spring  16  to the pad clip  15  with sufficient support force. Hence, when mounting the pad clip  15 , it is not possible to handle the pad clip  15  and the return spring  16  as an integral article, so that it is necessary to separately perform the mounting operations. Also, just after mounting the return spring  16 , the elastic urging force is applied to the pads  9   a ,  9   b  in the direction getting away from each other. Hence, it is necessary to configure the pads  9   a ,  9   b  so that they are not separated and deviated from the support  3  in the axial direction. Also, even when separating the caliper upon the replace of the pads  9   a ,  9   b , since the elastic urging force of the return spring  16  is being applied to the respective pads  9   a ,  9   b , it is necessary to configure the respective pads  9   a ,  9   b  so that they are not separated. Such assembling operation or replacing operation is troublesome, so that the assembling cost is increased. 
     Also, in the second example, both end portions of the return spring  16  are engaged to the outer peripheral edges of the respective pads  9   a ,  9   b . Hence, at a state where the braking is released, the pads  9   a ,  9   b  are more apt to be inclined in a direction coming close to the rotor at the inner diameter sides (inner peripheral edges). Therefore, the side surfaces of the rotor and the inner peripheral edges of the linings  14   a ,  14   b  of the pads  9   a ,  9   b  easily rub each other. 
     Also, the magnitudes of the elastic urging force applied to the pads  9   a ,  9   b  by the return spring  16  are the same. Therefore, an amount of wear of the lining  14   b  of the outer pad  9   b  of the pads  9   a ,  9   b  may be larger than that of the lining  14   a  of the inner pad  9   a . That is, upon the braking release, the supply of the pressure oil into the cylinder section is stopped, so that the force of pressing the inner pad  9   a  toward the rotor is lost. Therefore, the inner pad  9   a  can be relatively easily displaced in a direction getting away from the inner side surface of the rotor. Compared to this, while the outer pad  9   b  is displaced in a direction getting away from the outer side surface of the rotor, the friction (for example, sliding friction to be applied between the guide pin and the guide hole) that is applied to the sliding section of the caliper acts as resistance. Accordingly, the outer pad  9   b  is difficult to be displaced in a direction getting away from the outer side surface of the rotor. As a result, as described above, an amount of wear of the lining  14   b  of the outer pad  9   b  may be larger than that of the lining  14   a  of the inner pad  9   a . Also, a thickness of the rotor may be varied due to the wear, which causes judder. 
     PTLs 2 to 4 do not describe or suggest a configuration for solving the above problems. 
     Also, as shown in  FIG. 59 , PTL5 discloses a structure where a return spring  56 , which is formed by bending a wire rod and has a pair of coil sections  55 ,  55  at a central portion thereof, is engaged to an anti-rattle spring  57 . In the structure disclosed in PTL5, each of the coil sections  55 ,  55  is provided so that a direction of a central axis and a diametrical direction are substantially matched. Therefore, as the coil sections  55 ,  55  are put on, a size of the support  3  in a circumferential direction is increased, so that it is difficult to secure a gap between the support  3  and an inner periphery of a wheel (not shown), regarding a layout. Also, outer end portions of the pads  9   a ,  9   b  in the diametrical direction are pressed by pressing sections (engaging sections)  58 ,  58  provided to the return spring  56 . Thereby, as the braking is released, the diametrically outer sides are widened each other, i.e., the pads  9   a ,  9   b  are easily fallen. Even when it is intended to press the diametrically central portions of the respective pads  9   a ,  9   b , a length (whole length) from each of the coil sections  55 ,  55  to each of the pressing sections  58 ,  58  is lengthened and the coil sections  55 ,  55  and the pressing sections  58 ,  58  are largely deviated in the diametrical direction (a diametrical length is increased). Hence, it is not possible to effectively use the elastic deformation of the coil sections  55 ,  55  as the returning force of separating the pads  9   a ,  9   b  from the rotor. Also, in the structure disclosed in PTL5, after the anti-rattle spring  57  is mounted to the support  3  and the respective pads  9   a ,  9   b  are then mounted thereto, the return spring  56  is simply mounted. That is, PTL5 does not consider at all that the return spring  56  is mounted to the anti-rattle spring  57  before the respective pads  9   a ,  9   b  are mounted and that the anti-rattle spring  57  and the return spring  56  are handled as an integral article (assembly). 
     CITATION LIST 
     Patent Literatures 
     
         
         [PTL1] JP-Y-61-21619 
         [PTL2] JP-U-5-36141 
         [PTL3] JP-U-5-14679 
         [PTL4] JP-U-2-92130 
         [PTL5] JP-A-56-127830 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     The invention has been made to solve the above problems. The invention implements a structure where when mounting a pad clip, it is possible to handle the pad clip and a return spring as an integral article (subassembly), thereby facilitating a mounting operation. Also, the invention implements a structure where it is possible to effectively use elastic deformation of a coil section configuring the return spring as a returning force of separating a pad from a rotor. Also, the invention implements a structure where the returning force, which is applied to an inner pad and an outer pad upon braking release, is made to be different, as required. 
     Solution to Problem 
     The invention provides a floating disc brake, a method of assembling the same and an assembly of a pad clip and a return spring. Like the floating disc brake that has been well known and has been described above, the floating disc brake of the invention has a support, a pair of pads, a caliper, pad clips and return springs. 
     The support is fixed to a vehicle body in the vicinity of a rotor rotating together with wheels. 
     Also, each of the pads has a lining provided on a surface (surface of both axial side surfaces facing an axial side surface of the rotor) of a pressure plate (it doesn&#39;t care whether the pressure plate and the lining are separate members or integrally formed). Both the pads are arranged at both axial sides of the rotor and are moveably guided in an axial direction of the rotor by the support. 
     Also, the caliper is axially displaceable in the axial direction of the rotor with being supported to the support. 
     Also, the pad clips are provided between the respective pads and the support and prevent the respective pads from moving with respect to the support. 
     Also, the return springs press the pad toward a direction getting away from the rotor. 
     Particularly, in the floating disc brake of the invention, at a state before both the pads are mounted, a part of the pad clip is provided with a constraining section receiving an elastic urging force of the return spring to thus support the return spring so as to enable the return spring to be mounted to the pad clip. 
     Also, the pad clip is arranged between the support and the pressure plate configuring the pad and has a leg section having the constraining section provided at a part thereof. 
     Also, the return spring is formed by bending a wire rod and has an abutting section that is abutted to the constraining section by an elastic restoring force thereof, an extension arm section extending toward the rotor-side, a returning section provided at a rotor-side end portion of the extension arm section, an engaging section that is engaged to a part of the pad clip and receives a reactive force to the pressing of the returning section to the pad and a coil section that is provided between the returning section and the engaging section and has a central axis substantially oriented in a rotational direction of the rotor. 
     The returning section contacts a surface of a part of a circumferential end portion of the pressure plate, the part protruding in a circumferential direction more than a circumferential end edge of the lining, and the surface facing a side surface of the rotor. 
     In the meantime, a trajectory of the returning section is preferably parallel with the central axis of the rotor as much as possible until the pads (linings) are almost worn from a state of new products. To this end, for example, when mounting the pads, the extension arm section can be arranged to be substantially parallel with the central axis of the rotor. In the meantime, the configuration of “substantially parallel” means a state close to parallel so that the elastic urging force of the return spring can be efficiently transferred to the pressure plate of the pad. An angle of the extension arm section changes as the lining of the pad is worn. Thus, the configuration of “substantially parallel” is not limited to the completely parallel configuration. For example, at a state close to parallel, i.e., at a state of the pad mounting, irrespective of a thickness (a degree of the wear) of the lining, the configuration of “substantially parallel” means a state where an inclined angle of the extension arm section with respect to the central axis is within ±15°, preferably within ±10°, more preferably within ±50. 
     Also, the state where the central axis of the coil section is substantially oriented in the rotational direction of the rotor means a state where the rotational direction (tangential direction) at the circumferentially central portion of the pad and the central axis are matched. However, the state is not limited to a case where the rotational direction and the direction of the central axis are completely matched and includes a case where the directions are slightly deviated (for example, within ±20°, preferably within ±10°). 
     According to the floating disc brake configured as described above, when mounting the pad clips, it is possible to handle the pad clips and the return springs as integral articles (assemblies, subassemblies), thereby facilitating the mounting operation. 
     That is, according to the invention, the pad clips are provided at parts thereof with the constraining sections, so that it is possible to receive the elastic urging force of the return springs and to thus support the return springs to the pad clips with the sufficient supporting force corresponding to the elastic urging force. Therefore, it is possible to handle the pad clips and the return springs as integral articles, so that it is possible to perform the operations of mounting the pad clips and the return springs at the same time, thereby facilitating the mounting operation. As a result, it is possible to improve the assembling performance, thereby reducing the assembling cost. 
     Also, it is possible to easily handle the assemblies of the pad clips and the return springs, and the burden on the management in the assembling factory of the disc brake is reduced by a half, compared to a case where the pad clips and the return springs are handled as separate articles. Also, it is possible to reduce the number of preparing processes, to prevent the mounting mismatch and to reduce the number of mounting processes. Also, it is possible to easily sale a part for replacement and the like in markets. 
     Also, according to the invention, since the return spring is provided with the coil section, it is possible to lower a constant of spring, compared to a configuration where the return spring is configured by a wire spring having no coil section. Therefore, even when amounts of wear of the linings of the pads are varied and amounts of axial movement of the pads are thus varied upon the braking, it is possible to lower the change in the elastic urging force to be applied to the pads. Also, since the central axis of the coil section is arranged in the rotational direction of the rotor, the coil section can be provided in a gap between an end portion of the pressure plate of the pad and the support. Also, it is possible to efficiently transfer the elastic urging force of the coil section to the returning section and engaging section of the return spring. Therefore, it is possible to further lower the elastic coefficient of the return spring, so that it is possible to further suppress the change in the elastic urging force with which the returning section presses the pad, which change is caused as the lining of the pad undergoes the wear. 
     When implementing the floating disc brake as described above, preferably, at least a part of the returning section is positioned on a virtual plane passing through the coil section of virtual planes orthogonal to the central axis of the coil section. In other words, the circumferential positions of the coil section and the part of the returning section are matched (the positions are made to overlap each other in the circumferential direction). 
     According to this configuration, the circumferential positions of the coil section and the part of the returning section are matched, so that the coil section is elastically deformed in a torsion direction (rolling-in direction). Therefore, it is possible to effectively use the elastic deformation (elastic urging force) of the coil section as a restoring force separating the pad from the rotor. 
     Also, when implementing the floating disc brake of the invention, preferably, the coil section and the returning section overlap each other in the axial direction of the rotor. More preferably, the central axis of the coil section and the returning section are made to overlap each other in the axial direction of the rotor. In this case, at a state where a new pad is mounted, the coil section and the returning section preferably overlap each other in the axial direction of the rotor. 
     According to this configuration, an operating direction of the returning force by the returning section is substantially matched with the axial direction that is a moving direction of the rotor. Therefore, it is possible to effectively separate the pad from the rotor. 
     Also, when implementing the floating disc brake of the invention, preferably, a diametrical position of the returning section substantially matches with a friction center of the pad. In this case, the configuration “substantially match” is not limited to a completely matched state, although the completely matched state is most preferable. That is, a state where the position is deviated from the completely matched state in the diametrical direction within ±10% (more preferably, ±5%) of a width size of a friction surface (surface of the lining, which is frictionally engaged with the side surface of the rotor upon the braking) of the pad in the diametrical direction is also the substantially matched state. Actually, a diametrical position of the returning section is constrained so that it is within a range of a protruding part (engaging protruding piece) that is provided at a circumferential end portion of the pressure plate and circumferentially protrudes more than a circumferential end edge of the lining (more specifically, the diametrical position of the returning section is constrained to a diametrically inner position of the most circumferentially protruding part of the engaging protruding piece). When the diametrical position is constrained as described above, the diametrical position of the returning section is substantially matched with the friction center of the pad. 
     According to the above configuration, at a state where the braking is released, it is possible to effectively prevent the pad from being inclined to the rotor and any one peripheral edge of inner and outer peripheral edges of the pad from rubbing with the side surface of the rotor. 
     Also, when implementing the invention, preferably, a position at which the returning section and the pressure plate contact and a position of the engaging section substantially match in a circumferential direction of the rotor. Meanwhile, in this case, the configuration “substantially match” means that both the positions are matched in the circumferential direction so that the moment of a direction rotating about the diametrical axis of the rotor is not caused in the return spring by a couple of force of a force that is applied to the return spring from a contact part between the returning section and the pressure plate and a force that is applied to the return spring from an engaged part of the engaging section and the pad clip or the moment is negligibly small even though it is caused. For example, the returning section and the pressure plate contact within a somewhat length range in the circumferential direction. Therefore, when the position of the engaging section is within the length range, the moment is not caused. This state is a state where the contact position and the position of the engaging section are matched. 
     According to the above configuration, the elastic urging force in a direction getting away from the rotor is applied to the pad by the return spring, so that the moment of a direction rotating about the diametrical axis is not caused in the return spring or the moment is negligibly small even though the moment occurs. Therefore, even when the return spring is configured by the inner spring element and the outer spring element, which are separate elements, it is possible to prevent both the spring elements from inadvertently separating from the pad clip. 
     Also, when implementing the invention, preferably, a direction along which the returning section presses the pressure plate and a direction along which the engaging section presses the pad clip are the substantially axial direction of the rotor and are the opposite directions each other. Meanwhile, in this case, the substantially axial direction includes a case where the direction of the force with which the respective sections press the other sections completely matches with the axial direction of the rotor and also a case where a difference between the pressing direction and the axial direction is small (45° or smaller, preferably 30° or smaller) and an axial component force of component forces of the force with which the respective sections press the other sections is large (70% or larger, preferably 85% or larger). 
     According to the above configuration, it is possible to effectively transfer the elastic urging force of the return spring to the pad, as the force separating the pads from the rotor (separating both the pads). Therefore, even though a return spring (for example, a thick wire rod) having particularly high elastic urging force is not used, it is possible to securely separate the pads. Since it is not necessary to particularly increase the elastic urging force of the return spring, it is possible to suppress the processing cost of the return spring and to facilitate the mounting operation of the return spring. This invention is also effective in a case where it is combined with the structure where the return spring is configured by the inner spring element and the outer spring element, which are separate elements. 
     Also, when implementing the invention, preferably, the leg section of the pad clip is provided at a diametrically central portion thereof with a positioning step section having a substantially U-shaped section and protruding toward the pad in a circumferential direction, and the positioning step section is elastically fitted onto an outer side of a protrusion section formed on a part of the support. The positioning step section holds the protrusion section, thereby positioning the pad clip in a diametrical direction. Also, the engaging section of the return spring is engaged into an engaging hole that is formed at a part of a leading end portion of the positioning step section, the part protruding more than a leading end surface of the protrusion section. That is, instead of a configuration where both inner surfaces (both diametrically side surfaces) of the positioning step section and both outer surfaces (both diametrically side surfaces) of the protrusion section are contacted over the substantial entire width in the axial direction of the rotor, the leading end portion of the positioning step section is made to protrude in the circumferential direction of the rotor slightly more than the leading end portion of the protrusion section, so that a gap is formed between the inner surface of the leading end portion of the positioning step section and the leading end surface of the protrusion section. The engaging section is inserted into the gap through the engaging hole. 
     According to the above configuration, it is possible to bring the positioning step section of the pad clip-side into contact with the protrusion section of the support-side over the substantial entire width. Therefore, it is possible to increase the support rigidity of the pad clip to the support. Also, it is possible to bring the provision position of the engaging section of the return spring close to the circumferentially central portion of the support, thereby easily implementing the structure of the invention. 
     Also, when implementing the invention, preferably, a concave recess in which the returning section can be housed is formed on the surface of the circumferential end portion of the pressure plate to which surface the returning section is contacted. Then, the returning section is housed in the concave recesses. 
     According to the above configuration, even when an amount of wear of the lining configuring each pad is increased (until the lining is completely worn), it is possible to reduce the sliding between the returning section and the side surface of the rotor, so-called the drag. Therefore, while effectively using (source saving) the lining, it is possible to reduce the relative sliding, thereby reducing the wear of the rotor sliding surface. 
     Also, when implementing the invention, preferably, an axially central portion of the extension arm section is inserted into the recess in the axial direction of the rotor, which recess is formed at the circumferential end edge of the pressure plate. 
     According to the above configuration, it is possible to realize a structure where the returning section is brought into contact with the circumferential end portion side surface (surface facing the rotor), without unnecessarily complicating the shapes of the return spring, the pad clip and the like. 
     Also, when implementing the invention, preferably, the constraining section and the abutting section are offset toward an opposite side to the pad in the circumferential direction more than a surface of the pad clip circumferentially facing a circumferential end surface of the pressure plate. 
     Also, when implementing the invention, preferably, the constraining section extends from a torque receiving section of the leg section toward an opposite side to the rotor in the axial direction of the rotor, the torque receiving section being provided so as to elastically press a circumferential end portion of the pad in a circumferential direction. 
     Also, when implementing the invention, preferably, the constraining section extends from a step section of the leg section toward an opposite side to the rotor in the axial direction of the rotor, the step section being provided so as to be engaged with a part of the support and thus to diametrically position the pad clip with respect to the support. 
     Also, when implementing the invention, preferably, the pad clip has a pair of leg sections each of which is arranged between the support and each of the pads. Also, the return spring has an abutting section, an extension arm section, a returning section and a coil section in a pair, respectively. 
     Also, when implementing the invention, preferably, both end portions of the pad clip are provided with constraining sections, and at a state where the abutting sections of the return spring are abutted to both the constraining sections, both the constraining sections engage a central portion of the return spring. A part of the return spring except for the returning sections is prevented from being inclined to thus protrude toward a center of the support in a circumferential direction of the rotor, so that both the pads are enabled to be easily mounted to the support (the mounting property of the pad is favorably made). 
     According to the above configurations, when mounting the pads, it is possible to effectively prevent the pressure plate, the constraining section and the abutting section from interfering with each other, so that it is possible to improve the operation efficiency of the mounting operation of the pads. 
     Also, when implementing the invention, preferably, the return spring is formed by bending one wire rod, the engaging section is omitted and the coil sections are connected by a connection arm section provided to extend over the rotor. 
     According to the above configuration, it is possible to reduce the number of parts and the number of mounting processes of the return spring to the pad clip (one mounting is sufficient). 
     Alternatively, the return spring has an inner spring element and an outer spring element, which are separate elements. Each of the inner and outer spring elements is provided with the abutting section, the extension arm section, the returning section, the engaging section and the coil section, respectively. 
     According to the above configuration, the shapes, the line diameters and the like are different between both the spring elements. Thereby, it is possible to easily make the elastic urging force to be applied to the inner pad and the outer pad different. Therefore, the elastic urging force to be applied to the outer pad is made to be larger than the elastic urging force to be applied to the inner pad, so that it is possible to lower the amount of wear of the lining of the outer pad in which the amount of wear thereof is apt to increase. 
     Also, when implementing the invention, preferably, the pad clip has an inner clip element and an outer clip element that have the constraining section, respectively, and are separate elements. 
     According to the above configuration, it is possible to make the pad clip (clip elements) smaller/lighter, compared to a configuration where the entire pad clip is integrally formed (for example, a portal in which a pair of leg sections is connected by a connection section). Therefore, it is possible to improve the handling property of the pad clip, thereby improving the mounting operability of the pad clip. Also, it is possible to reduce the material cost for forming the pad clip. Also, irrespective of the thickness (axial size) of the rotor to be combined and used, it is possible to use the pad clip (it is possible to commonalize the pad clip elements). 
     Compared to this, for a portal in which a pair of leg sections is connected by a connection section, it is possible to improve the mounting property to the support (the number of mounting operations is reduced) and to enable the mounting (clamp) to the support with good precision. For example, by using a processing surface of a part (rotor pass part) of the support, which is provided to extend over the rotor, it is possible to maintain (to position) the backside of the connection section of the pad clip with good precision. 
     Also, when implementing the invention, preferably, the return spring has a pair of coil sections, which is separated from each other in the axial direction of the rotor, and a pair of outer arm sections extending from the respective coil sections toward an opposite side to the rotor in the axial direction of the rotor and having an abutting section at a part thereof, respectively. 
     In the meantime, the pad clip is configured so that the diametrically outer end portions of the pair of leg sections are connected by a connection section having an engaging notch or engaging hole into which a part of the return spring can be engaged. Also, each leg section is provided with a step section that is engaged with a part of the support and positions the pad clip with respect to the support in the diametrical direction. 
     The abutting section that is provided at the part of each outer arm section is enabled to abut on the constraining section with the elastic urging force being applied toward the direction separating from the rotor in the axial direction of the rotor, and the engaging section (engaging section provided to the inner arm section extending from the coil section toward the rotor in the axial direction of the rotor or the connection arm section having a shape connecting a pair of the inner arm sections), which is provided between both the coil sections of the return spring in the axial direction of the rotor, is engaged into the engaging notch or engaging hole with the elastic urging force being applied in the diametrically outer side so that the engaging section cannot be axially displaced. 
     At this state, the diametrically inner end portion of each coil section is elastically pressed to the diametrically outer surface of each positioning step section toward the diametrical inner side. 
     Alternatively, when implementing the invention, preferably, the return spring has an inner spring element and an outer spring element which have a coil section and a pair of arm sections, respectively, and are separate elements. 
     Also, each leg section configuring the pad clip is provided with a step section that is engaged with a part of the support to thus position the pad clip with respect to the support in a diametrical direction and a folding section that is formed by folding a diametrically central portion of the step portion into a substantial U shape with bent at a substantial right angle from a diametrically outer surface of the step section toward a diametrically outer side. 
     The abutting section provided to a part of an outer arm section of the arm sections configuring the inner and outer spring elements is abutted to each constraining section with an elastic urging force being applied in a direction getting away from the rotor in the axial direction of the rotor, the outer arm section extending from each coil section to an opposite side to the rotor in the axial direction of the rotor. 
     The engaging section, which is provided to a part of an inner arm section extending from each coil section toward the rotor in the axial direction of the rotor, is engaged to a part of the pad clip with an elastic urging force being applied toward the rotor in the axial direction of the rotor. 
     Also, at the above state, each coil section is mounted to a part surrounded by the diametrically outer surface of each step portion and each folding section. 
     According to the above configuration, it is possible to stabilize a posture (shape) of the return spring. Therefore, it is possible to effectively prevent the return spring from separating from the pad clip or the mounting position from deviating. Therefore, it is possible to improve the operability of the mounting operation of the pad clip and the return spring to the support. Also, at a state where the pad clip and the return spring are mounted to the support, it is possible to easily apply the desired elastic urging force (returning force) to the pad by the return spring. 
     Also, when implementing the invention, preferably, the engaging section provided to the leading end portion of each inner arm section is engaged into the engaging hole formed on the diametrically outer surface of each step section. 
     Also, a method of assembling a floating disc brake according to the invention is a method of assembling the floating disc brake. After elastically deforming the return spring, the elastic deformation is released to abut the abutting section provided to a part of the return spring to a constraining section of the pad clip by an elastic restoring force of the return spring, and the return spring is mounted to the pad clip. After that, the pad clip and the return spring are mounted to the support at the same time. Then, both the pads are mounted to the support. 
     Also, an assembly of a pad clip and a return spring according to the invention includes a pad clip and a return spring. 
     The pad clip has a leg section that is arranged between a support and a pad configuring a disc brake and a constraining section that is formed at a part of the leg section. 
     Also, the return spring is formed by bending a wire rod and has a coil section, an abutting section that is provided at a part of an arm section extending from the coil section and a returning section that is provided at a leading end portion of the arm section and contacts a part of the pad to thus press the pad in a direction getting away from the rotor. 
     The coil section is arranged so that a central axis thereof is substantially perpendicular to both surfaces (a surface facing the pad in the circumferential direction and an opposite surface thereto) of the leg section, and the abutting section is abutted to the constraining section by an elastic restoring force of the return spring. Thereby, the return spring is supported (mounted) to the pad clip, thereby configuring the assembly of the pad clip and the return spring. 
     Meanwhile, in the assembly of the pad clip and the return spring, the return spring may be supported to the pad clip, and the return spring may be supported at a state before the pad clip is mounted to the support or after the pad clip is mounted to the support. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a floating disc brake according to a first embodiment of the invention, which is seen from an outer diameter side and an outer side with a caliper being omitted. 
         FIG. 2  is an orthographic view of the floating disc brake shown in  FIG. 1 , which is seen from an outer diameter side. 
         FIG. 3  is an orthographic view of the floating disc brake shown in  FIG. 1 , which is seen from an inner side. 
         FIG. 4  is a perspective view showing a state (assembly) where a return spring is mounted to a pad clip shown in  FIG. 1 , which is seen from an outer diameter side and a front side. 
         FIG. 5  is a perspective view showing a state (assembly) where the return spring is mounted to the pad clip shown in  FIG. 1 , which is seen from an inner diameter side and a backside. 
         FIGS. 6A to 6C  show a state (assembly) where the return spring is mounted to the pad clip shown in  FIG. 1 , in which  FIG. 6A  is a front view,  FIG. 6B  is a plan view and  FIG. 6C  is a side view. 
         FIGS. 7A to 7C  show only one spring element configuring the return spring shown in  FIG. 1  and elastically deformed to a mounted state to the pad clip, in which  FIG. 7A  is a front view,  FIG. 7B  is a plan view and  FIG. 7C  is a side view. 
         FIGS. 8A and 8B  show two examples of a recess that is formed at an engaging protruding piece of a pressure plate shown in  FIG. 1 . 
         FIG. 9  is a perspective view showing a state (assembly) where a return spring according to a second embodiment of the invention is mounted to the pad clip, which is seen from an outer diameter side and a front side. 
         FIG. 10  is a perspective view of a floating disc brake according to a third embodiment of the invention, which is seen from an outer diameter side and an inner side with a caliper being omitted. 
         FIG. 11  is an orthographic view of the floating disc brake shown in  FIG. 10 , which is seen from an outer diameter side. 
         FIG. 12  is an orthographic view of the floating disc brake shown in  FIG. 10 , which is seen from an inner side. 
         FIG. 13  is a perspective view showing the floating disc brake shown in  FIG. 10  before a pad is mounted. 
         FIG. 14  is an orthographic view of the floating disc brake shown in  FIG. 10 , which is seen from an outer diameter side. 
         FIG. 15  is an orthographic view of the floating disc brake shown in  FIG. 10 , which is seen from an inner side. 
         FIG. 16  is a perspective view showing a state (assembly) where a return spring is mounted to a pad clip shown in  FIG. 10 , which is seen from an outer diameter side and a front side. 
         FIGS. 17A and 17B  show a state (assembly) where the return spring is mounted to the pad clip shown in  FIG. 10 , in which  FIG. 17A  is a front view and  FIG. 17B  is a plan view. 
         FIGS. 18A and 18B  show two examples of one spring element configuring the return spring shown in  FIG. 10 . 
         FIG. 19  is a perspective view of a floating disc brake according to a fourth embodiment of the invention, which is seen from an outer diameter side and an inner side with a caliper being omitted. 
         FIG. 20  is an orthographic view of the floating disc brake shown in  FIG. 19 , which is seen from an outer diameter side. 
         FIG. 21  is an orthographic view of the floating disc brake shown in  FIG. 19 , which is seen from an inner side. 
         FIG. 22  is a perspective view showing a state (assembly) where a return spring is mounted to a pad clip shown in  FIG. 19 , which is seen from an outer diameter side and a front side. 
         FIG. 23  is a perspective view showing only one spring element configuring the return spring shown in  FIG. 19  and elastically deformed to a mounted state to the pad clip. 
         FIG. 24  is a perspective view showing a floating disc brake according to a fifth embodiment of the invention before a pad is mounted, which is seen from an outer diameter side and an inner side. 
         FIG. 25  is a perspective view showing a state (assembly) where one spring element configuring a return spring is mounted to one clip element configuring a pad clip shown in  FIG. 24 . 
         FIGS. 26A to 26C  show a state (assembly) where one spring element is mounted to one clip element shown in  FIG. 25 , in which  FIG. 26A  is a front view,  FIG. 26B  is a plan view and  FIG. 26C  is a side view. 
         FIG. 27  is a perspective view of a floating disc brake according to a sixth embodiment of the invention, which is seen from an outer side and a diametrically outer side with a rotor being omitted. 
         FIG. 28  is a perspective view showing a caliper of  FIG. 27  with a part thereof being cut. 
         FIG. 29  is a perspective view showing a state where each spring element is elastically deformed to a mounted state to a pad except for the caliper and pad shown in  FIG. 27 . 
         FIG. 30  is an enlarged view of an X part shown in  FIG. 29 . 
         FIG. 31  is a sectional view taken along a line Y-Y of  FIG. 29 , which shows the return spring of  FIG. 29  before it is mounted to a pad. 
         FIG. 32  is a sectional view taken along a line Y-Y of  FIG. 29 , which shows the return spring of  FIG. 29  after the return spring is elastically deformed as it is mounted to the pad. 
         FIG. 33  is a view corresponding to a left side of  FIGS. 31 and 32 , which shows that the return spring is elastically deformed as it is mounted to the pad. 
         FIG. 34  is an orthographic view showing a state where the pad is mounted to the support to which the pad clip and the return spring shown in  FIG. 27  are mounted, which is seen from a diametrically outer side. 
         FIG. 35  is an orthographic view showing a state where the pad is mounted to the support to which the pad clip and the return spring shown in  FIG. 27  are mounted, which is seen from an outer side. 
         FIG. 36  is an orthographic view showing a state where the pad is mounted to the support shown in  FIG. 35 , which is seen from a left side. 
         FIG. 37  is a front view showing an assembly of the pad clip and return spring shown in  FIG. 27 . 
         FIG. 38  is a perspective view of a floating disc brake according to a seventh embodiment of the invention, which is seen from an outer diameter side and an outer side with a pad and a caliper being omitted. 
         FIG. 39  is a perspective view showing the floating disc brake shown in  FIG. 38 , which is seen from an outer diameter side and an inner side. 
         FIG. 40  is an orthographic view showing the floating disc brake shown in  FIG. 38 , which is seen from an outer diameter side. 
         FIG. 41  is an orthographic view showing the floating disc brake shown in  FIG. 38 , which is seen from an outer side. 
         FIG. 42  is a partially enlarged view of  FIG. 38 . 
         FIG. 43  is a perspective view showing an assembly of the pad clip (element) and return spring (element) shown in  FIG. 38 . 
         FIG. 44  is a perspective view of a floating disc brake according to an eighth embodiment of the invention, which is seen from an outer diameter side and an outer side with a pad and a caliper being omitted. 
         FIG. 45  is a perspective view showing the floating disc brake shown in  FIG. 44 , which is seen from an outer diameter side and an inner side. 
         FIG. 46  is an orthographic view showing the floating disc brake shown in FIG.  44 , which is seen from an outer diameter side. 
         FIG. 47  is an orthographic view showing the floating disc brake shown in  FIG. 44 , which is seen from an outer side. 
         FIG. 48  is a partially enlarged view of  FIG. 44 . 
         FIG. 49  is a perspective view showing an assembly of the pad clip and return spring shown in  FIG. 44 . 
         FIG. 50  is a perspective view of a floating disc brake according to a ninth embodiment of the invention, which is seen from an outer diameter side and an outer side with a pad and a caliper being omitted. 
         FIG. 51  is a perspective view showing the floating disc brake shown in  FIG. 50 , which is seen from an outer diameter side and an inner side. 
         FIG. 52  is an orthographic view showing the floating disc brake shown in  FIG. 50 , which is seen from an outer diameter side. 
         FIG. 53  is an orthographic view showing the floating disc brake shown in  FIG. 50 , which is seen from an outer side. 
         FIG. 54  is an orthographic view showing the floating disc brake shown in  FIG. 53 , which is seen from a right side. 
         FIG. 55  is a partially enlarged view of  FIG. 50 . 
         FIG. 56  is a perspective view showing an assembly of the pad clip (element) and return spring (element) shown in  FIG. 50 . 
         FIG. 57  is a partially sectional view of a first example of a floating disc brake according to the prior art, which is seen from an outer diameter side. 
         FIG. 58  is a partially cut perspective view of a second example of the prior art. 
         FIG. 59  is a perspective view of a third example of the prior art with parts being removed. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
       FIGS. 1 to 9  show a first embodiment of the invention. In the meantime, a feature of the invention relates to a structure of a pad clip  15   a  and a return spring  16   a  so as to easily perform a mounting operation of the pad clip  15   a  and the return spring  16   a , including a structure of the first embodiment. The other structures and operational effects are the substantially same as those of the first example of the prior art. Thus, the illustration and description of the equivalent parts will be omitted or simplified. Hereinafter, features of the first embodiment of the invention will be described. 
     Also in the first embodiment, engaging protruding pieces  21 ,  21  that are provided at both circumferential end portions of pressure plates  10   a ,  10   b  configuring inner and outer pads  9   a ,  9   b  are engaged to engaging recesses  20 ,  20  that are formed at rotation input side and rotation output side engaging sections  7 ,  8 , which are provided at both circumferential end portions of a support  3 . Thereby, the pads  9   a ,  9   b  are axially displaceably supported. Also, the pad clips  15   a ,  15   b  are respectively interposed between the respective engaging recesses  20 ,  20  and the respective engaging protruding pieces  21 ,  21 . Each of the pad clips  15   a ,  15   a  is formed by bending a metal plate having elasticity and corrosion resistance such as stainless spring steel and has a pair of axially spaced leg sections  22 ,  22  and a connection section  23  connecting diametrically outer end portions of the leg sections. 
     Each leg section  22  has a positioning step section  36 , a torque receiving section  37  and a bent section  38 , which are continuous in the diametrical direction. The positioning step section  36  circumferentially protrudes at a diametrically central portion of the leg section  22  toward each pad  9   a ,  9   b , has a substantially U-shaped section and is engaged with a protrusion section  39  formed at a part of the support  3  (the protrusion section  39  is elastically fitted/held at an outer side of the positioning step section) to thus position each pad clip  15   a  in the diametrical direction. Also, the torque receiving section  37  is bent at a substantially right angle from a diametrically inner surface of the positioning step section  36  toward a diametrically inner side and elastically presses each engaging protruding piece  21  provided at the circumferential end portion of each of the pads  9   a ,  9   b . Also, the bent section  38  is circumferentially bent from a diametrically inner end portion of the torque receiving section  37  toward each of the pads  9   a ,  9   b  and elastically contacts a diametrically inner surface of each engaging protruding piece  21 . 
     In particular, in the first embodiment of the invention, both axial end portions of each of the pad clips  15   a ,  15   a  are provided with a pair of constraining sections  24 ,  24  at parts more axially spaced from the rotor  1  (refer to  FIG. 2 ) than the pressure plates  10   a ,  10   b  configuring the respective pads  9   a ,  9   b . Each of the constraining sections  24 ,  24  is formed by bending a central portion of the torque receiving section toward each of the pads  9   a ,  9   b  in the circumferential direction with extending in a direction axially separating from each of the torque receiving sections  37 ,  37  provided at inner-diametrically biased parts of the respective leg sections  22 ,  22 . The constraining sections  24 ,  24  having the above configuration are provided so as to mount the return spring  16   a  to each pad clip  15   a  (so as to configure an assembly of the pad clip  15   a  and the return spring  16   a ) before both pads  9   a ,  9   b  are mounted, receive an elastic urging force (returning force) of each return spring  16   a  and supports each return spring  16   a . Also, protruding pieces  25 ,  25  are provided at outer-diametrically biased parts of the leg sections  22 ,  22 , i.e., at parts bent at a substantially right angle from diametrically outer surfaces of the respective positioning step sections  36 ,  36  toward a diametrically outer side. Each of the protruding pieces  25 ,  25  is formed by forming a U-shaped slit at the outer-diametrically biased part of each of the leg sections  22 ,  22  and bending an inner side of the slit toward the caliper (direction coming close to each other). 
     The pad clips  15   a ,  15   a  having the above configuration are respectively provided at an anchor side (a brake torque receiving side) of the disc brake and at an opposite side to the anchor. The leg sections  22 ,  22  configuring each of the pad clips  15   a ,  15   a  are arranged between outer surfaces of the engaging protruding pieces  21 ,  21  provided at the end portions of the respective inner and outer pads  9   a ,  9   b  and inner surfaces of the engaging recesses  20 ,  20  formed at the rotation input side and rotation output side engaging sections  7 ,  8 . By the torque receiving sections  37 ,  37  of the respective leg sections  22 ,  22 , the respective engaging protruding pieces  21 ,  21  are elastically pressed in the circumferential direction, so that the respective pads  9   a ,  9   b  are prevented from rattling with respect to the support  3 . Also, at this state, the connection section  23  is positioned at the diametrically outer side of the outer periphery of the rotor  1  and connects the diametrically outer end portions of the leg sections  22 ,  22 . 
     Also, in order to separate friction surfaces of linings  14   a ,  14   a  configuring the respective pads  9   a ,  9   b  from both side surfaces of the rotor  1  as the braking is released, the return springs  16   a ,  16   a  are provided at both circumferential end portions of the respective pads  9   a ,  9   b . In the first embodiment, each of the return springs  16   a ,  16   a  is configured by an inner spring element  26   a  and an outer spring element  26   b , which are separate elements. As shown in  FIG. 7 , each of the spring elements  26   a ,  26   b  is a torsion coil spring that is formed by bending a wire rod of stainless spring steel such as piano line and in which base sections of a pair of arm sections  28   a ,  28   b  (inner arm section  28   a , outer arm section  28   b ) continue from a coil section  27  provided at an axially central portion. 
     The coil section  27  has an inner diameter enabling the protruding piece  25  of the pad clip  15   a  to insert therein and has a central axis that is substantially oriented in a rotational direction of the rotor  1  (which is a rotational direction (tangential direction) of the rotor  1  at the circumferentially central portion of the pads  9   a ,  9   b , is perpendicular to both surfaces of the leg section  22  and is a left-right direction of  FIG. 2 ). 
     Also, a leading end portion of the inner arm section  28   a  axially extending toward the rotor  1  of both the arm sections  28   a ,  28   b  is circumferentially bent toward the pad clip  15   a  (opposite side to the pads  9   a ,  9   b ) and serves as an engaging section  29 . Also, as required, as shown with the dashed-two dotted line in  FIG. 5 , leading end portions of the respective engaging portions  29 ,  29  are folded in the diametrically outer direction to thus configure deviation preventing pieces  40 ,  40 . The respective deviation preventing pieces  40 ,  40  are engaged on a backside of the connection section  23  to thus prevent each of the return springs  16   a  from deviating from the pad clip  15   a.    
     Compared to this, the outer arm section  28   b  extending toward an opposite side to the rotor  1  has a substantial L shape, when seen from the front, and has a curved section  30 , an abutting section  31 , an extension arm section  32  and a returning section  33  in order from a base end portion-side toward a leading end portion-side thereof. The abutting section  31  is a part that abuts on a surface (inner surface) of the constraining section  24 ,  24  configuring the pad clip  15   a , which surface faces the side surface of the rotor  1 , by the elastic restoring force of each spring element  26   a  ( 26   b ). In the first embodiment of the invention, the abutting section is linear and extends perpendicularly from an inner diameter-side end portion of the curved section  30  toward the diametrically inner side. 
     Also, the extension arm section  32  is bent at a substantial right angle from a diametrically inner end portion of the abutting section  31  in a direction coming close to the rotor  1  and is oriented so that it is substantially parallel with the central axis of the rotor  1 . Therefore, in the first embodiment, in order to prevent the extension arm section  32  and an circumferential end edge of each of the pressure plates  10   a ,  10   b  from interfering with each other, the engaging protruding pieces  21 ,  21  of the respective pressure plates  10   a ,  10   b  are provided at the circumferential end edges thereof with recesses  34  ( 34   a ). An axially central portion of the extension arm section  32  is axially inserted into each recess  34  ( 34   a ). Specifically, the axially central portion of the extension arm section  32  is inserted into the recess  34  that is opened in the circumferential direction only, as shown in  FIG. 8A , or inserted into the recess  34  that is opened in the circumferential direction and diametrical direction (inner side), as shown in  FIG. 8B . Also, in the first embodiment, an axial length of the extension arm section  32  is constrained as follows. That is, the axial length of the extension arm section  32  is made to be larger than an axial thickness of each of the pads  9   a ,  9   b  and is made to be a length enabling the returning section  33  to contact the surface (inner surface) of each of the engaging protruding pieces  21 ,  21  facing the side surface of the rotor  1  with the abutting section  31  and the inner surface of the constraining section  24  being contacted each other at a state where both pads  9   a ,  9   b  are mounted (at the axial position of each of the pads  9   a ,  9   b  upon the non-braking). 
     Also, the returning section  33  is bent from a leading end portion (end portion of the rotor  1 -side) of the extension arm section  32  in a direction circumferentially separating from each pad clip  15   a  (in an opposite side to the engaging section  29 ) and contacts the inner surface of each of the engaging protruding pieces  21 ,  21 . Also, a part (a based end portion, in the shown example) of the returning section  33  is positioned on a virtual plane (refer to the dotted-dashed line Y in  FIG. 7C ) passing through the coil section  27  of virtual planes orthogonal to the central axis (refer to the dotted-dashed line X in  FIG. 7C ) of the coil section  27 . Also, the returning section  33  is located at a position (the lower part in  FIG. 7C ) overlapping with the coil section  27  in the axial direction of the rotor  1  at a state where the return spring  16   a  is mounted to the pad clip  15   a  (at the state where the pads  9   a ,  9   b  are mounted). Also, a diametrical position of the returning section  33  is the substantially same as a diametrical position of a friction center of each of the linings  14   a ,  14   b  configuring the respective pads  9   a ,  9   b.    
     Also, in the first embodiment, although not shown in the drawings, both the spring elements  26   a ,  26   b  may have different line diameters or shapes. Specifically, of the spring elements  26   a ,  26   b , it is possible to make load (returning force) of the outer spring element  26   b  (applying the elastic urging force to the outer pad  9   b ) arranged at the outer side of the rotor  1  larger than load (returning force) of the inner spring element  26   a  (applying the elastic urging force to the inner pad  9   a ) arranged at the inner side. Also, it is possible to make the load (returning force) of the spring element, which is provided at an opposite side (entrance side, rotation input side) to the anchor, larger than the load (returning force) of the spring element, which is provided at the anchor side (exit side, rotation output side). 
     In the first embodiment having the pad clips  15   a  and the return springs  16   a , when assembling the floating disc brake, the return springs  16   a  are mounted (preset) to the pad clips  15   a , as shown in  FIGS. 4 to 6 , at a state before the respective pads  9   a ,  9   b  are mounted to the support  3 . That is, as shown in  FIGS. 4 to 6 , an assembly of the pad clip  15   a  and the return spring  16   a  is configured. To this end, specifically, at a state where the arm sections  28   a ,  28   b  configuring each of the spring elements  26   a ,  26   b  are elastically deformed in the direction coming close to each other, the protruding piece  25  is inserted into the coil section  27  and then the arm sections  28   a ,  28   b  are elastically returned (the elastic deformation is released). Thereby, the engaging section  29  provided at the leading end portion of the inner arm section  28   a  is engaged on the inner peripheral edge of the connection section  23  with the elastic urging force being applied in the diametrically outer side, and the abutting section  31  provided at the outer arm section  28   b  is enabled to abut on the inner surface of the constraining section  24  with the elastic urging force being axially applied in the direction separating from the rotor  1 . In other words, both the arm sections  28   a ,  28   b  of each of the spring elements  26   a ,  26   b  extend between the inner peripheral edge of the connection section  23  configuring the pad clip  15   a  and the inner surface of the constraining section  24 . Thereby, the inner peripheral surface of the coil section  27  is pressed to the protruding piece  25  toward the rotor  1  in the diametrically inner side and axial directions. At this state, both the spring elements  26   a ,  26   b  (return spring  16   a ) are mounted to the pad clip  15   a . Also, the inner peripheral surface of the coil section  27  is pressed to the protruding piece  25 , so that the respective spring elements  26   a ,  26   b  are positioned with respect to the pad clip  15   a  in the diametrical and axial directions. 
     In the meantime, the operation of mounting the return spring  16   a  to the pad clip  15   a  may be performed at an assembling factory of the disc brake or may be performed in advance at a supply source of parts (for example, a factory at which the pad clip  15   a  and the return spring  16   a  are manufactured). When performing the mounting operation at a supply source of parts, the assemblies of the pad clips  15   a  and the return springs  16   a  are carried, prepared and assembled in the assembling factory of the disc brake. 
     After the return spring  16   a  is mounted to the pad clip  15   a  (or after the mounted assembly is prepared) as described above, the assemblies of the pad clips  15   a  and the return springs  16   a  are mounted to the support  3  and then both the pads  9   a ,  9   b  are mounted to the support  3 , as shown in  FIGS. 1 to 4 . In the first embodiment, at the state where both the pads  9   a ,  9   b  are mounted, the elastic urging force from the return springs  16   b  is not applied to both the pads  9   a ,  9   b  yet. At a state where a caliper (not shown) is being mounted, both the pads  9   a ,  9   b  are made to slightly come close to each other (for example, 1 mm or smaller) and the elastic urging force in the direction getting away from each other is applied to both the pads  9   a ,  9   b . At this state, the respective abutting sections  31 ,  31  are slightly moved upward from the respective constraining sections  24 ,  24 . 
     The floating disc brake of the first embodiment assembled as described above operates upon the braking and upon the braking release, as follows. 
     First, upon the braking, the pressure oil is supplied into a cylinder section provided to the caliper (not shown) and the lining  14   a  of the inner pad  9   a  is pressed to the inner surface of the rotor  1  from the upper to the lower in  FIG. 2 . Thus, as a reaction to the pressing force, the caliper  2  is displaced upward in  FIG. 2 , based on the sliding between both the guide pins and both the guide holes  5 ,  5 , and the claw section presses the lining  14   b  of the outer (a widthwise outer side of the vehicle and lower side in  FIG. 2 ) pad  9   b  to the outer surface of the rotor  1 . As a result, the rotor  1  is strongly held from both the inner and outer side surfaces, so that the braking is made. At this time, the returning sections  33 ,  33  configuring the respective return springs  16   a ,  16   a  are pushed by the inner surfaces of the respective engaging protruding pieces  21 ,  21  and are thus axially displaced along the direction approaching the rotor  1 . At the same time, the respective extension arm sections  32 ,  32  are axially displaced and the respective abutting sections  31 ,  31  are separated from the inner surfaces of the respective constraining sections  24 ,  24 . As a result, an amount of bending of the respective outer arm sections  28   b ,  28   b  (an amount of elastic deformation of the coil section  27 ) is increased, compared to the non-braking. 
     Upon the braking release, the respective returning sections  33 ,  33  are pressed to the inner surfaces of the respective engaging protruding pieces  21 ,  21 , based on the elastic restoring force of the respective return springs  16   a ,  16   a , and the elastic urging force is applied to both the pads  9   a ,  9   b  in the direction getting away from each other (the direction of separating the respective pads  9   a ,  9   b  from the rotor  1 ). Thereby, the friction surfaces of the linings  14   a ,  14   b  of both the pads  9   a ,  9   b  are separated from both the side surfaces of the rotor  1 . Particularly, in the first embodiment of the invention, the elastic urging force is applied to both the pads  9   a ,  9   b  until the respective abutting sections  31 ,  31  abut on the inner surfaces of the respective constraining sections  24 ,  24 , so that the elastic urging force is not applied when the abutting is made. 
     As clearly seen from the above descriptions, in the first embodiment, when mounting the respective pad clips  15   a , it is possible to handle the respective pad clips  15   a  and the respective return springs  16   a  as integral articles (assemblies, subassemblies), thereby facilitating the mounting operation. 
     That is, in the first embodiment, as described above, the respective pad clips  15   a  are provided with the constraining sections  24 ,  24 , so that it is possible to receive the elastic urging force of the respective return springs  16   a  (spring elements  26   a ,  26   b ) and to thus support the respective return springs  16   a  to the respective pad clips  15   a  with the sufficient supporting force corresponding to the elastic urging force. Therefore, it is possible to handle the respective pad clips  15   a  and the respective return springs  16   a  as integral articles (assemblies), so that it is possible to perform the operations of mounting the respective pad clips  15   a  and the respective return springs  16   a  at the same time, thereby facilitating the mounting operation. As a result, it is possible to improve the assembling performance, thereby reducing the assembling cost. Also, since it is possible to mount the respective return springs  16   a  to the respective pad clips  15   a  in a wide space in which the operation space is not limited, it is also possible to facilitate the mounting operation. 
     Also, in the first embodiment, at a state just after both the pads  9   a ,  9   b  are mounted (the caliper is not mounted yet), the elastic urging force is not applied to both the pads  9   a ,  9   b . Thus, it is not necessary to consider a configuration of preventing both the pads  9   a ,  9   b  from separating axially from the support  3 . Also, the respective constraining sections  24 ,  24  are engaged with the engaging protruding pieces  21 ,  21  of the respective pads  9   a ,  9   b , so that it is possible to prevent the respective pads  9   a ,  9   b  from separating from the support  3 . Accordingly, the assembling operation or conveying operation is not troublesome. Also, since it is possible to handle the respective pad clips  15   a  and the respective return springs  16   a  as integral articles, it is possible to reduce the part management cost. 
     Also, the operation of mounting the respective return springs  16   a  to the respective pad clips  15   a  may be performed in advance at the supply source of the parts, and the assemblies of the respective return springs  16   a  and the respective pad clips  15   a  may be delivered in the assembling factory of the disc brake. In this case, the burden on the management (delivery management, management of boxes and the like, number management, stock management, ordering management, storage place and the like) and the like is reduced by a half, compared to a case where the respective return springs  16   a  and the respective pad clips  15   a  are handled as separate articles. Also, it is possible to reduce the number of preparing processes, to prevent the mounting mismatch and to reduce the number of mounting processes. 
     Also, in the first embodiment, the inner peripheral surfaces of the respective coil sections  27  are elastically pressed to the respective protruding pieces  25 , so that it is possible to stabilize the postures (shapes) of the respective spring elements  26   a ,  26   b . Therefore, it is possible to effectively prevent the respective return springs  16   a  (spring elements  26   a ,  26   b ) from separating from the respective pad clips  15   a  or the mounting positions from deviating. Therefore, it is possible to improve the operability of the mounting operation of the respective pad clips  15   a  and the respective return springs  16   a  to the support  3 . 
     Also, it is possible to easily apply the desired returning force to both the pads  9   a ,  9   b  due to the respective return springs  16   a . Also, the respective return springs  16   a  are composed of the torsion coil springs having the respective coil sections  27 , so that it is possible to lower a constant of the spring, compared to a configuration where a wire spring having no coil section is used. Therefore, even when the amounts of wear of the linings  14   a ,  14   a  of both the pads  9   a ,  9   b  are varied and amounts of axial movement of both the pads  9   a ,  9   b  are thus increased upon the braking, it is possible to lower (stabilize) the change in the elastic urging force to be applied to both the pads  9   a ,  9   b . That is, it is possible to make the elastic urging force to be applied to both the pads  9   a ,  9   b  constant until the linings  14   a ,  14   b  are almost worn from a state of new products. Also, in the first embodiment, the part of each returning section  33  is positioned on the virtual plane Y passing through each coil section  27  of the virtual planes orthogonal to the central axis X of each coil section. Hence, the circumferential positions of the coil section  27  and the part (base end portion) of the returning section  33  are matched, so that the respective coil sections  27  are elastically deformed in a torsion direction (rolling-in direction) upon the braking. Therefore, it is possible to effectively use the elastic deformation (elastic urging force) of the respective coil sections  27  as the returning force of separating the respective pads  9   a ,  9   b  from the rotor  1 . Also, since the respective coil sections  27  and the respective returning sections  33  overlap with each other in the axial direction of the rotor  1 , it is possible to substantially match the operational direction of the returning force by the respective returning sections  33  with the axial direction of the rotor  1  that is the moving direction of the respective pads  9   a ,  9   b . Accordingly, it is possible to effectively separate the respective pads  9   a ,  9   b  from the rotor  1 . 
     Also, in the first embodiment, the respective extension arm sections  32  are oriented in substantially parallel with the central axis of the rotor  1  and the diametrical positions of the respective returning sections  33  are matched with the diametrical positions of the friction centers of the linings  14   a ,  14   b  configuring the respective pads  9   a ,  9   b . Accordingly, at the state where the braking is released, it is possible to effectively prevent both the pads  9   a ,  9   b  from being inclined to the rotor  1  and any one of both the inner and outer peripheral edges of both the pads  9   a ,  9   b  from rubbing with the side surface of the rotor  1 . Also, since the respective extension arm sections  32  are oriented in substantially parallel with the central axis of the rotor  1 , it is possible to easily make trajectories of the respective returning sections  33 ,  33  parallel until the respective pads  9   a ,  9   b  (linings  14   a ,  14   b ) are almost worn from a state of new products. Also, the circumferential end edges of the respective engaging protruding pieces  21 ,  21  are formed with the recesses  34  ( 34   a ) and the respective extension arm sections  32  are axially inserted into the respective recesses  34  ( 34   a ). Hence, it is possible to realize a structure where the respective returning sections  33 ,  33  are brought into contact with the inner surfaces of the respective engaging protruding pieces  21 ,  21 , without unnecessarily complicating the shapes of the respective return springs  16   a  (spring elements  26   a ,  26   b ), the respective pad clips  15   a  and the like. 
     Also, in the first embodiment, the respective return springs  16   a  are composed of the inner spring element  26   a  and the outer spring element  26   b . Thus, for example, it is possible to make the line diameter of the outer spring element  26   b  smaller than the line diameter of the inner spring element  26   a . Therefore, it is possible to make the elastic urging force to be applied to the outer pad  9   b  larger than the elastic urging force to be applied to the inner pad  9   a , so that it is possible to effectively lower the amount of wear of the lining  14   b  of the outer pad  9   b  in which the amount of wear thereof is apt to increase. Also, it is possible to suppress the thickness variation of the rotor  1 , so that it is possible to effectively prevent the judder from occurring. In addition to the configuration where the line diameters are different between the inner and outer spring elements  26   a ,  26   b , the shapes at a free state and the windings of the coil section  27  may be made to be different, so that it is possible to make the elastic urging force to be applied to the outer pad  9   b  and the elastic urging force to be applied to the inner pad  9   a  different. 
     Meanwhile, when implementing the invention, concave recesses may be formed on the inner surfaces of the engaging protruding pieces  21 ,  21  and the respective returning sections  33  may be housed in the concave recesses. According to this configuration, even when the amounts of wear of the linings  14   a ,  14   b  are increased (until the linings are completely worn), it is possible to prevent the respective returning sections  33 ,  33  and the side surfaces of the rotor  1  from rubbing each other. 
     Second Embodiment 
       FIG. 9  shows a second embodiment of the invention. In the second embodiment, the return spring  16   b  is integrally formed by bending one wire rod, differently from the first embodiment. The return spring  16   b  has a shape connecting the leading end portion of the inner arm section  28   a  of inner spring element  26   a  and the leading end portion of the inner arm section  28   a  (for example, refer to  FIG. 4 ) of the outer spring element  26   b  of the first embodiment. Specifically, the return spring  16   b  has a connection arm section  35  provided at an axially central portion with being put on the rotor  1  (refer to  FIG. 2 , for example), a pair of coil sections  27   a ,  27   a  continuing from both axial end portions of the connection arm section  35  and outer arm sections  28   b ,  28   b  having base portions continuing from the respective coil sections  27   a ,  27   a . The configurations of the coil section  27   a  and the outer arm section  28   b  are the same as those of the first embodiment. 
     Also in the second embodiment using the return spring  16   b  having the above configuration, when assembling the floating disc brake, the return spring  16   b  is mounted to the pad clip  15   a  by using the constraining sections  24 ,  24  provided at both axial end portions of the pad clip  15   a . That is, as shown in  FIG. 9 , an assembly of the pad clip  15   a  and the return spring  16   a  (inner spring element  26   a  and outer spring element  26   b ) is configured. To this end, specifically, at a state where both the outer arm sections  28   b ,  28   b  configuring the return spring  16   b  are elastically deformed in the approaching direction each other, the protruding pieces  25 ,  25  formed at the pad clip  15   a  are respectively inserted into the coil sections  27   a ,  27   a  without rattling and then the outer arm sections  28   b ,  28   b  are elastically returned (the elastic deformation is released). Thereby, the pair of abutting sections  31 ,  31  configuring the return spring  16   b  are elastically abutted on the inner surfaces of the respective constraining sections  24 ,  24  by the elastic restoring force of the return spring  16   b . In other words, both the abutting sections  31 ,  31  are made to extend between the inner surfaces of the respective constraining sections  24 ,  24 . At this state, the return spring  16   b  is mounted to the pad clip  15   a . Also in the second embodiment, the assemblies of the pad clips  15   a  and the return springs  16   b  are mounted to the support  3  (refer to  FIG. 1 , for example) and then both the pads  9   a ,  9   b  (refer to  FIG. 1 , for example) are mounted to the support  3 . Also in the second embodiment, as required, as shown with the dashed-two dotted line in  FIG. 9 , the axially central portion of the connection arm section  35  configuring the return spring  16   b  is made to protrude in a circumferential direction getting away from the caliper  2  (refer to  FIGS. 27 ,  28  and  57 ) and in the diametrically outer side, thereby forming a deviation preventing piece  40   a . The deviation preventing piece  40   a  is engaged on the backside of the connection section  23  configuring the pad clip  15   a  to thus prevent the return spring  16   b  from separating from the pad clip  15   a . When the deviation preventing piece  40   a  is provided, the deviation preventing piece  40   a  is inserted between the leg sections  22 ,  22 RL with being inclined with respect to the pad clip  15   a  and the posture of the return spring  16   b  is then returned to thus mount the return spring  16   b  to the pad clip  15   a.    
     In the second embodiment using the return spring  16   b  having the above described configuration and capable of performing the mounting operation as described above, the return spring  16   b  is integrally formed. Thereby, compared to the case where the separate structures are adopted, like the first embodiment, it is possible to reduce the number of parts and the number of mounting processes to the pad clip  15   a . Also, both the coil sections  27 ,  27  are connected by the connection arm section  35 , so that it is possible to omit the engaging sections  29  (refer to  FIGS. 4 to 7 , for example) for receiving the reactive force to the pressing of the returning sections  33 ,  33  to the respective pads  9   a ,  9   b . Therefore, it is possible to perform the assembling operation (the operation of mounting the pad clips  15   a  and the return springs  16   b ) more simply. 
     The other configurations and operational effects are the same as those of the first embodiment. 
     Third Embodiment 
       FIGS. 10 to 18  show a third embodiment of the invention. The features of this embodiment are that the support structure of a return spring  16   c  to the pad clip  15   b  is different from the first embodiment. Since the basic structures of the pad clip  15   b  and the return spring  16   c  are the substantially same as those of the first embodiment, the description of the common parts are omitted or simplified. Hereinafter, the features of the third embodiment are described. 
     As shown in  FIG. 16 , also in the third embodiment, the pad clip  15   b  is configured by connecting diametrically outer end portions of a pair of axially spaced leg sections  22   a ,  22   a  by a connection section  23   a . Particularly, in the third embodiment, the connection section  23   a  is formed with a pair of engaging notches  41 ,  41  for engaging parts (engaging sections  29   a  that will be described later) of the respective return springs  16   c . The respective engaging notches  41 ,  41  are opened to a diametrically inner end edge of the connection section  23   a  and are spaced in the axial direction. Also, a diametrical depth of each of the engaging notches  41 ,  41  is twice as large as the line diameter of the return spring  16   c  and an axial width thereof is slightly larger than the line diameter. In the meantime, although not shown, instead of the engaging notches  41 ,  41 , the connection section  23   a  may be formed with a pair of engaging holes penetrating the connection section  23   a  in the circumferential direction (plate thickness direction) and the engaging sections  29   a ,  29   a  that will be described later may be engaged into the respective engaging holes. 
     Also, in the third embodiment, while the connection section  23   a  are formed with the engaging notches  41 ,  41 , the outer-diametrically biased parts of the respective leg sections  22   a ,  22   a , i.e., the parts bent from the diametrically outer surfaces of the respective positioning step sections  36 ,  36  toward a diametrically outer side are configured by simple flat surfaces. That is, in the third embodiment, the protruding pieces  25  (refer to  FIGS. 1 and 7 , for example) of the first and second embodiments are omitted. 
     Also, a pair of constraining sections  24   a ,  24   a  is provided at both axial end portions of each of the pad clips  15   b  so as to mount the respective return springs  16   c  to the respective pad clips  15   b  at a state before the inner and outer pads  9   a ,  9   b  are mounted. Particularly, in the third embodiment, each of the constraining sections  24   a ,  24   a  is formed by bending a part of the torque receiving section, which is biased to the leading end side, toward an opposite side to the pads  9   a ,  9   b  in the circumferential direction with extending in a direction axially separating from each of the torque receiving sections  37 ,  37  provided at inner-diametrically biased parts of the respective leg sections  22   a ,  22   a . Thereby, in the third embodiment, the respective constraining sections  24   a ,  24   a  are provided (offset) at the opposite sides to the pads  9   a ,  9   b  in the circumferential direction than the inner surfaces (surfaces circumferentially facing the circumferential end surfaces of the engaging protruding pieces  21 ,  21 ) of the respective torque receiving sections  37 ,  37 . 
     Also, in order to separate the friction surfaces of the linings  14   a ,  14   b  configuring the respective pads  9   a ,  9   b  from both side surfaces of the rotor  1  (refer to  FIG. 11 ) as the braking is released, the respective return springs  16   c ,  16   c  are provided at both circumferential end portions of the respective pads  9   a ,  9   b . Also in the third embodiment, each of the return springs  16   c  is configured by an inner spring element  26   c  and an outer spring element  26   d , which are separate elements. As shown in  FIG. 18 , each of the spring elements  26   c ,  26   d  is a torsion coil spring that is formed by bending a wire rod of stainless spring steel such as piano line and in which base sections of a pair of arm sections  28   c ,  28   d  (inner arm section  28   c , outer arm section  28   d ) continue from a coil section  27   b  provided at an axially central portion of a diametrically outer end-biased part. 
     Particularly, in the third embodiment, a diameter of the coil section  27   b  is made to be larger than the diameter of the coil section  27  ( 27   a ) configuring the return spring  16   a  ( 16   b ) used in the first and second embodiments. Thereby, at a state where the respective return springs  26   c ,  26   d  are mounted to the respective pad clips  15   b , it is possible to bring the diametrically inner end portions of the respective coil sections  27   b  into contact with the diametrically outer surfaces of the respective positioning step sections  36  provided at the diametrically central portions of the respective leg sections  22   a . In the meantime, when implementing the third embodiment, the number of windings of the respective coil sections  27   b  is not particularly problematic. As shown in  FIG. 18A , the coil section may be wound one time, or as shown in  FIG. 18B , the coil section may be wound twice or more. Also, the number of windings of the coil section  27   b  may be different between the inner spring element  26   c  and the outer spring element  26   d . In this case, preferably, the number of windings of the coil section  27   b  configuring the outer spring element  26   d  is made to be larger than that of the coil section  27   b  configuring the inner spring element  26   c  and the wire rod configuring the outer spring element  26   d  is made to be thicker than the wire rod configuring the inner spring element  26   c . Thereby, the returning force to be applied to the outer pad  9   b  is made to be larger than the returning force to be applied to the inner pad  9   a , without increasing the constant of spring. 
     Also, regarding both the arm sections  28   c ,  28   d , the leading end portion of the inner arm section  28   c  axially extending toward the rotor  1  is circumferentially bent toward the pad clip  15   b  (opposite side to the pads  9   a ,  9   b ) and thus forms the engaging section  29   a . The engaging sections  29   a  are engaged into the respective engaging notches  41  of the connection section  23   a  without the rattling. Specifically, the respective engaging sections  29   a  are engaged with the respective engaging notches  41  with the elastic urging force being applied toward the diametrically outer side so that the respective engaging sections cannot be axially displaced. Also, the leading end portion of each of the engaging sections  29   a  is bent toward the diametrically outer side, thereby forming a deviation preventing piece  40   b . The respective deviation preventing pieces  40   b  are engaged on the backside of the connection section  23   a , thereby preventing the respective return springs  16   c  from separating from the respective pad clips  15   b.    
     The outer arm section  28   d  extending toward the opposite side to the rotor  1  has a substantial U shape, when seen from the front, and has a curved section  30   a , an outer diameter-side bent section  42 , an abutting section  31   a , an inner diameter-side bent section  43 , an extension arm section  32   a  and a returning section  33   a  in order from a base end side toward the leading end portion. The curved section  30   a  has a quadrant shape and is bent in a diametrically inner direction as it is directed toward the leading end. Also, the outer diameter-side bent section  42  is circumferentially bent at a substantial right angle from an inner diameter-side end portion of the curved section  30   a  toward the opposite side to the pads  9   a ,  9   b . Also, the abutting section  31  a is a part that abuts on a surface (inner surface) of each of the constraining sections  24   a ,  24   a  configuring the respective pad clips  15   b , which surface faces the side surface of the rotor  1 , by the elastic restoring force of each spring element  26   c  ( 26   d ), is linear and extends perpendicularly from an inner diameter-side end portion of the outer diameter-side curved section  42  toward the diametrically inner side. Also, the inner diameter-side bent section  43  is bent from an inner diameter-side end portion of the abutting section  31   a  toward the respective pads  9   a ,  9   b  in the circumferential direction and toward the rotor  1  in the axial direction. By this configuration, the abutting section  31   a  is provided (offset) at the opposite side to the pads  9   a ,  9   b  in the circumferential direction than the inner surfaces (surfaces circumferentially facing the circumferential end surfaces of the engaging protruding pieces  21 ,  21 ) of the respective torque receiving sections  37 ,  37 . 
     Also, the extension arm section  32   a  is linear, extends from the leading end portion of the inner diameter-side bent section  43  in the direction coming close to the rotor  1  and is oriented in substantially parallel with the central axis of the rotor  1 . Therefore, also in the third embodiment, in order to prevent the extension arm section  32   a  and an circumferential end edge of each of the pressure plates  10   a ,  10   b  from interfering with each other, the engaging protruding pieces  21 ,  21  of the respective pressure plates  10   a ,  10   b  are provided at the circumferential end edges with the recesses  34  ( 34   a ). An axially central portion of the extension arm section  32   a  is axially inserted into each recess  34  ( 34   a ). Also, the returning section  33   a  is bent from the leading end portion of the extension arm section  32   a  in a direction (opposite side to the engaging section  29   a ) circumferentially separating from the pad clip  15   a  and is contacted on the inner surface of each of the engaging protruding pieces  21 ,  21 . Also, the diametrical position of the returning section  33   a  is the substantially same as the diametrical position of the friction center of each of the linings  14   a ,  14   b  configuring the respective pads  9   a ,  9   b.    
     In the third embodiment having the pad clips  15   b  and the return springs  16   c , when assembling the floating disc brake, the return springs  16   c  are mounted (preset) to the pad clips  15   b , as shown in  FIGS. 16 and 17 , at a state before the respective pads  9   a ,  9   b  are mounted to the support  3 . That is, as shown in  FIGS. 16 and 17 , an assembly of the pad clip  15   b  and the return spring  16   c  (inner spring element  26   c  and outer spring element  26   d ) is configured. To this end, for example, at a state where the engaging sections  29   a  provided at the leading end portions of the inner arm sections  28   c  configuring the respective spring elements  26   c ,  26   d  are inserted (engaged) into the engaging notches  41  of the connection section  23   a , the outer arm sections  28   d  are elastically deformed in the approaching direction toward the inner arm sections  28   c  and then the outer arm sections  28   d  are elastically returned (the elastic deformation is released). Thereby, the engaging section  29  is engaged into the engaging notch  41  with the elastic urging force being applied in the diametrically outer side so that the respective engaging sections cannot be axially displaced, and the abutting section  31   a  is enabled to abut on the inner surface of the constraining section  24   a  with the elastic urging force being axially applied in the direction separating from the rotor  1 . Also, at this state, the inner diameter-side end portion of the coil section  27   b  is elastically pressed to the outer diameter-side surface of each positioning step section  36  toward the diametrical inner side. As a result, in the third embodiment, both the spring elements  26   c ,  26   d  (return spring  16   c ) are mounted to the pad clip  15   b  with being positioned in the diametrical and axial directions (an assembly of the pad clip  15   b  and the return spring  16   c  is configured). Also, in the third embodiment, since the deviation preventing pieces  40   b  and the abutting sections  31   a  of both the spring elements  26   c ,  26   d  are arranged on the backside of the pad clip  15   b  and the remaining sections are arranged on the front face side, both the spring elements  26   c ,  26   d  are circumferentially positioned with respect to the pad clip  15   b.    
     After the return springs  16   c  are mounted to the pad clips  15   b  as described above, the assemblies of the pad clips  15   b  and the return springs  16   c  are mounted to the support  3  (refer to  FIGS. 13 to 15 ) and then both the pads  9   a ,  9   b  are mounted to the support  3 , as shown in  FIGS. 10 to 12 . Also, at the state where both the pads  9   a ,  9   b  are mounted to the support  3 , the elastic urging force from the return springs  16   c  is not applied to both the pads  9   a ,  9   b  yet. 
     Also in the floating disc brake of the third embodiment having the above configuration and assembled as described above, when mounting the respective pad clips  15   b , it is possible to handle the respective pad clips  15   b  and the return springs  16   c  as integral articles (assemblies, subassemblies), like the first and second embodiments. Therefore, it is possible to perform the operations of mounting the respective pad clips  15   a  and the respective return springs  16   a  at the same time, thereby facilitating the mounting operation. As a result, it is possible to improve the assembling performance, thereby reducing the assembling cost. Also, at a state just after both the pads  9   a ,  9   b  are mounted (the caliper is not mounted yet), the elastic urging force is not applied to both the pads  9   a ,  9   b . Thus, it is not necessary to consider a configuration of preventing both the pads  9   a ,  9   b  from separating axially from the support  3 . Accordingly, the assembling operation or conveying operation is not troublesome. Also, since it is possible to handle the respective pad clips  15   a  and the respective return springs  16   a  as integral articles (assemblies), it is possible to reduce the part management cost. 
     Also, in the third embodiment, the respective spring elements  26   c ,  26   d  are positioned in the axial, diametrical and circumferential directions with the respective return springs  16   c  being mounted to the respective pad clips  15   b . Therefore, it is possible to stabilize the postures (shapes) of the respective spring elements  26   c ,  26   d . Therefore, it is possible to effectively prevent the respective return springs  16   c  (spring elements  26   c ,  26   d ) from separating from the respective pad clips  15   a  or the mounting positions from deviating. As a result, it is possible to improve the operability of the mounting operation of the respective pad clips  15   a  and the respective return springs  16   a  to the support  3 . Also, it is possible to apply the stable returning force to the respective pads  9   a ,  9   b  by the respective return springs  16   c.    
     Also, the respective constraining sections  24   a ,  24   a  and the respective abutting sections  31   a ,  31   a  are circumferentially offset toward the opposite side to the pads  9   a ,  9   b  than the inner surfaces of the respective torque receiving sections  37 ,  37  (surfaces facing the circumferential end surfaces of the engaging protruding pieces  21 ,  21 ). Therefore, it is possible to perform the mounting operation of both the pads  9   a ,  9   b  just by parallel moving both the pads  9   a ,  9   b  in the axial direction. Thus, the mounting operation is easy, so that it is possible to improve the operation efficiency. 
     The other configurations and operational effects are the same as those of the first embodiment. 
     Fourth Embodiment 
       FIGS. 19 to 23  show a fourth embodiment of the invention. The features of the fourth embodiment are that the support structure of a return spring  16   d  to a pad clip  15   c  is different from the first to third embodiments. Since the basic structures of the pad clip  15   c  and the return spring  16   d  are the substantially same as those of the first embodiment, the description of the common parts are omitted or simplified. Hereinafter, the features of the fourth embodiment are described. 
     Also in the fourth embodiment, each pad clip  15   c  is configured by connecting diametrically outer end portions of a pair of axially spaced leg sections  22   b ,  22   b  by a connection section  23   b . Particularly, in the fourth embodiment, the respective leg sections  22   b ,  22   b  are provided at the diametrically outer end portions with folding sections  44 ,  44  for supporting the coil sections  27   c ,  27   c  configuring the return spring  16   d . Specifically, the folding sections  44 ,  44  are formed by circumferentially folding a diametrically central portion into a substantial U shape toward the pads  9   a ,  9   b  with being bent at a substantial right angle from the diametrically outer surfaces of the positioning step sections  36 ,  36  in the diametrically outer side. In the meantime, a diametrical size between the diametrically inner surfaces of the folding sections  44 ,  44  and the diametrically outer surfaces of the positioning step sections  36 ,  36  is slightly larger than a diameter of each coil section  27   c . Also, a gap between both side surfaces of each of the folding sections  44 ,  44 , which side surfaces face each other in the circumferential direction, is slightly larger than a thickness of each coil section  27   c.    
     Also in the fourth embodiment, a pair of constraining sections  24   b ,  24   b  is provided at both axial end portions of each of the pad clips  15   c . Particularly, in the fourth embodiment, each of the constraining sections  24   b ,  24   b  is formed by bending a leading end portion (end portion at the opposite rotor-side) toward the opposite side to the pads  9   a ,  9   b  in the circumferential direction with extending from a part biased to the diametrically outer surface of each of the positioning step sections  36 ,  36  and the diametrically inner end side of each of the folding sections  44 ,  44  toward the opposite side to the rotor in the axial direction. Also in the fourth embodiment, the respective constraining sections  24   b ,  24   b  are offset toward the opposite side to the pads  9   a ,  9   b  in the circumferential direction than the inner surfaces (surfaces facing the circumferential end surfaces of the engaging protruding pieces  21 ,  21 ) of the torque receiving sections  37 ,  37 . 
     Also, in the fourth embodiment, the diametrically outer surfaces of the positioning step sections  36 ,  36  configuring the respective leg sections  22   b ,  22   b  are formed with engaging holes  45 ,  45  for engaging parts (leading end portions of inner arm sections  28   e  of spring elements  26   e ,  26   f ) of the return springs  16   d , with penetrating in the diametrical direction. 
     Also, in order to separate the friction surfaces of the linings  14   a ,  14   a  configuring the pads  9   a ,  9   b  from both side surfaces of the rotor  1  (refer to  FIG. 20 ) as the braking is released, the respective return springs  16   d ,  16   d  are provided at both circumferential end portions of the respective pads  9   a ,  9   b . Each of the return springs  16   d ,  16   d  is composed of an inner spring element  26   e  and an outer spring element  26   f , which are separate elements. As shown in  FIG. 23 , each of the spring elements  26   e ,  26   f  is a torsion coil spring that is formed by bending a wire rod of stainless spring steel such as piano line and in which base sections of a pair of arm sections  28   e ,  28   f  continue from a coil section  27   c  provided at an axially central portion of a diametrically outer end side-biased part. 
     Particularly, in the fourth embodiment, each coil section  27   c  is mounted to a part surrounded by the diametrically outer surface of each abutting step section  36  and each folding section  44  without the rattling. Also, of both the arm sections  28   e ,  28   f , the leading end portion of the inner arm section  28   e  extending toward the rotor  1  in the axial direction and toward the inner side in the circumferential direction is bent toward the rotor  1 , thereby configuring an engaging section  46 . The respective engaging sections  46  are engaged in the engaging holes  45  formed at the positioning step sections  36  from the diametrically outer side. Also, at this state, the leading end-biased part of each inner arm section  28   e  is abutted in an opening of each engaging hole  45  with the elastic urging force being axially applied toward the rotor  1 . 
     Also, the outer arm section  28   f  extending to the opposite side to the rotor  1  has a substantial L shape, when seen from the front, and has a base end portion  47 , a curved section  48 , an extension arm section  32   b  and a returning section  33   b  in order from a base end side toward the leading end portion. The base end portion  47  has an abutting section  31   b  at its diametrically central portion and is linear. Also, the abutting section  31   b  is a part that abuts on a side edge (inner side edge) of the constraining section  24   b ,  24   b  configuring the pad clip  15   c , which edge faces the side surface of the rotor  1 , with the elastic urging force axially applied to the opposite side to the rotor  1 , by the elastic restoring force of each of the spring elements  26   e ,  26   f  (coil sections  27   c ,  27   c ). Also, the bent section  48  is bent from the inner diameter-side end portion of the base end portion  47  toward the respective pads  9   a ,  9   b  in the circumferential direction and toward the rotor  1  in the axial direction. 
     Also, the extension arm section  32   b  is linear, extends from the leading end portion of the bent section  48  in the direction coming close to the rotor  1  and is oriented in substantially parallel with the central axis of the rotor  1 . Therefore, also in the fourth embodiment, in order to prevent the extension arm section  32   b  and the circumferential end edge of each of the pressure plates  10   a ,  10   b  from interfering with each other, the engaging protruding pieces  21 ,  21  of the respective pressure plates  10   a ,  10   b  are provided at the circumferential end edges thereof with the recesses  34  ( 34   a ). An axially central portion of the extension arm section  32   b  is axially inserted into each recess  34  ( 34   a ). Also, the returning section  33   b  is bent from the leading end portion of the extension arm section  32   b  in a direction circumferentially separating from each pad clip  15   a  and is contacted on the inner surface of each of the engaging protruding pieces  21 ,  21 . Also, the diametrical position of the returning section  33   b  is the substantially same as the diametrical position of the friction center of each of the linings  14   a ,  14   b  configuring the respective pads  9   a ,  9   b.    
     In the fourth embodiment having the pad clips  15   c  and the return springs  16   d , when assembling the floating disc brake, the return spring  16   d  is mounted (preset) to the pad clip  15   c , as shown in  FIG. 22 , at a state before the respective pads  9   a ,  9   b  are mounted to the support  3 . That is, as shown in  FIG. 22 , an assembly of the pad clip  15   c  and the return spring  16   d  (inner spring element  26   e  and outer spring element  26   f ) is configured. To this end, for example, the coil sections  27   c  configuring the respective spring elements  26   e ,  26   f  are mounted to the parts surrounded by the diametrically outer surfaces of the respective positioning step sections  36  and the respective folding sections  44 . Then, at a state where the engaging sections  46  provided at the leading end portions of the inner arm sections  28   e  are engaged into the engaging holes  45  formed on the diametrically outer surfaces of the positioning step sections  36 , the outer arm sections  28   f  are elastically deformed in the approaching direction toward the inner arm sections  28   e  and then the outer arm sections  28   f  are elastically returned (the elastic deformation is released). Thereby, the leading end side biased parts of the inner arm sections  28   e  are abutted in the openings of the respective engaging holes  45  with the elastic urging force being axially applied toward the rotor  1 -side, and the abutting sections  31   a  are enabled to abut on the side edges of the constraining sections  24   b  with the elastic urging force being axially applied in the direction separating from the rotor  1  and toward the diametrically outer side. As a result, in the fourth embodiment, both the spring elements  26   e ,  26   f  (return spring  16   d ) are mounted to the pad clip  15   c  with being positioned in the diametrical, circumferential and axial directions (an assembly of the pad clip  15   c  and the return spring  16   d  is configured). 
     After the return springs  16   d  are mounted to the pad clips  15   c  as described above, the assemblies of the pad clips  15   c  and the return springs  16   d  are mounted to the support  3  and then both the pads  9   a ,  9   b  are mounted to the support  3 , as shown in  FIGS. 19 to 21 . Also in the fourth embodiment, at the state where both the pads  9   a ,  9   b  are mounted to the support  3 , the elastic urging force from the return springs  16   d  is not applied to both the pads  9   a ,  9   b  yet. 
     Also in the floating disc brake of the fourth embodiment having the above configuration and assembled as described above, when mounting the respective pad clips  15   b , it is possible to handle the respective pad clips  15   b  and the return springs  16   c  as integral articles (assemblies, subassemblies), like the first to third embodiments. Therefore, it is possible to perform the operations of mounting the respective pad clips  15   a  and the respective return springs  16   a  at the same time, thereby facilitating the mounting operation. As a result, it is possible to improve the assembling performance, thereby reducing the assembling cost. Also, at a state just after both the pads  9   a ,  9   b  are mounted (the caliper is not mounted yet), the elastic urging force is not applied to both the pads  9   a ,  9   b  yet. Thus, it is not necessary to consider a configuration of preventing both the pads  9   a ,  9   b  from separating axially from the support  3 . Accordingly, the assembling operation or conveying operation is not troublesome. Also, since it is possible to handle the respective pad clips  15   a  and the respective return springs  16   a  as integral articles (assemblies), it is possible to reduce the part management cost. 
     Also, in the fourth embodiment, the respective spring elements  26   e ,  26   f  are positioned in the axial, circumferential and diametrical directions with the respective return springs  16   d  being mounted to the respective pad clips  15   c . Therefore, it is possible to stabilize the postures (shapes) of the respective spring elements  26   e ,  26   f . Therefore, it is possible to effectively prevent the respective return springs  16   d  (spring elements  26   e ,  26   f ) from separating from the respective pad clips  15   c  or the mounting positions from deviating. As a result, it is possible to improve the operability of the mounting operation of the respective pad clips  15   c  and the respective return springs  16   d  to the support  3 . Also, it is possible to apply the stable returning force to the respective pads  9   a ,  9   b  by the respective return springs  16   d  with being mounted to the support  3  as described above. Also, in the pad clips  15   c  of the fourth embodiment, since the respective constraining sections  24   c ,  24   c  are provided at the diametrically outer surface parts of the positioning step sections  36 ,  36 , it is possible to reduce the material cost, compared to the pad clips  15  ( 15   a ,  15   b ) of the first to third embodiments. That is, in the pad clips  15  ( 15   a ,  15   b ) of the first to third embodiments, the constraining sections  24 ,  24   a  are provided to axially extend from the torque receiving sections  36  in the direction getting away from each other, so that the amount of the extension is larger than that of the fourth embodiment. Therefore, the width size of the pad clip  15  ( 15   a ,  15   b ) upon the developing before bending the respective constraining sections  24 ,  24   a  is increased. Compared to this, in the pad clip  15   c  of the fourth embodiment, since it is possible to reduce the width size upon the developing, it is possible to suppress the material cost. 
     The other configurations and operational effects are the same as those of the first and third embodiments. 
     Fifth Embodiment 
       FIGS. 24 to 26  show a fifth embodiment of the invention. The features of the fifth embodiment relate to the shape of the pad clip  15   c  of the fourth embodiment. That is, a pad clip  15   d  of the fifth embodiment has a shape in which the connection section  23   b  is omitted from the pad clip  15   c  of the fourth embodiment and is configured by an inner clip element  49   a  and an outer clip element  49   b , which are separate elements and have the leg sections  22   b ,  22   b , respectively. 
     In the fifth embodiment having the pad clip  15   d , when assembling the floating disc brake, as shown in  FIGS. 25 and 26 , the inner spring element  26   e  and the outer spring element  26   f  configuring the return spring  16   d  are mounted (preset) to the inner clip element  49   a  and the outer clip element  49   b , respectively. That is, an assembly of the pad clip  15   d  (inner clip element  49   a  and outer clip element  49   b ) and the return spring  16   d  (inner spring element  26   e  and outer spring element  26   f ) is configured. Then, as shown in  FIG. 24 , an inner assembly  50   a  configured by the inner clip element  49   a  and the inner spring element  26   e  and an outer assembly  50   b  configured by the outer clip element  49   b  and the outer spring element  26   f  are mounted to the support  3  separately (or at the same time). 
     In the fifth embodiment having the above configuration, like the fourth embodiment, it is possible to make the pad clip  15   d  (inner and outer clip elements  49   a ,  49   b ) smaller/lighter, compared to the configuration where the pad clip  15   c  is integrally formed. Therefore, it is possible to improve the handling property of each pad clip  15   d , thereby improving the mounting operability of the respective pad clips  15   d . Also, it is possible to reduce the material cost for forming the respective pad clips  15   d.    
     The other configurations and operational effects are the same as those of the first and fourth embodiments. 
     Sixth Embodiment 
       FIGS. 27 to 37  show a sixth embodiment of the invention. Also in the sixth embodiment, a pair of return springs  16   d ,  16   e  that is provided at the rotation input side and the rotation output side is respectively configured by an inner spring element  26   g  and an outer spring element  26   h . Also, each of a pair of leg sections  22   c ,  22   c , which is provided to each of a pair of pad clips  15   e ,  15  mounted to the rotation input side and the rotation output side of the support  3 , is provided at a diametrically central portion thereof with a positioning step section  36   a ,  36   a  having a substantially U-shaped section and circumferentially protruding toward each of the inner and outer pads  9   a ,  9   b . The positioning step sections  36   a ,  36   a  are elastically fitted to outer sides of protrusion sections  39   a ,  39   a  formed at both circumferential end portions of an inner surface of a maintaining section that is provided to the support  3 , with a diametrically outer side thereof being opened, so as to maintain parts of the support  3 , i.e., the respective pads  9   a ,  9   b . The protrusion sections  39   a ,  39   a  are held from both diametrical sides thereof by the respective positioning step sections  36   a ,  36   a , so that the respective pad clips  15   e ,  15   e  are diametrically positioned. 
     Particularly, in the structure of the sixth embodiment, the respective protrusion sections  39   a ,  39   a  are held over the entire width thereof by the respective positioning step sections  36   a ,  36   a . That is, in the fourth and fifth embodiments, the positioning step section  36  holds the protruding section  39  (refer to  FIG. 24 ) by a pressing piece  51  (refer to  FIGS. 24 and 26C ) folded over only a part of the positioning step section  36  in the width direction. Thus, it may not be said that the support rigidity of the respective pad clips  15   c ,  15   d  to the support  3  is sufficient. Particularly, in the fifth embodiment shown in  FIGS. 24 to 26 , when the pad clip is divided into the inner and outer clip elements  49   a ,  49   b , the rigidity of the inner and outer spring elements  26   e ,  26   f  (refer to  FIGS. 19 to 26 ) may be insufficient in the applying direction of the elastic urging force of the respective spring elements  26   e ,  26   f . However, in the sixth embodiment, since the respective positioning step sections  36   a ,  36   a  holds the respective protrusion sections  39   a ,  39   a  over the entire width (the respective sections  36   a ,  36   a  contact over the entire width in the width direction with the sufficient high surface pressure), it is possible to sufficiently secure the rigidity. 
     Also, in the sixth embodiment, a protruding amount of each of the positioning step sections  36   a ,  36   a  in the circumferential direction is made to be larger than that of each of the protrusion sections  39   a ,  39   a , so that a gap  52  (refer to  FIG. 35 ) is formed between an inner surface of the leading end portion of each positioning step section  36   a ,  36   a  and a leading end surface of each protrusion section  39   a ,  39   a . Engaging sections  46   a ,  46   a , which are provided at one end portions of the inner spring element  26   g  and the outer spring element  26   h  configuring both the return springs  16   e ,  16   e , are inserted into engaging holes  45   a ,  45   a  that are formed at the leading end portions of the respective positioning step sections  36   a ,  36   a , which leading end portions are formed at parts more protruding the leading end surfaces of the respective protrusion sections  39   a ,  39   a.    
     In the structure of the sixth embodiment, by the above configuration, the mounting positions of the respective engaging sections  46   a ,  46   a  are made to come close to the circumferential central portion of the support  3 , and in the circumferential direction, positions at which returning sections  33   c ,  33   c  provided at the other end portions of the respective spring elements  26   g ,  26   h  and the pressure plates  10   a ,  10   b  of the inner and outer pads  9   a ,  9   b  contact each other and positions of the respective engaging sections  46   a ,  46   a  are substantially matched. That is, the respective returning sections  33   c ,  33   c  and the respective pressure plates  10   a ,  10   b  contact each other within a length range (length range between the dashed-dotted line α and the dashed-dotted line β shown in  FIGS. 34 and 35 ) in the circumferential direction. In the sixth embodiment, the circumferential positions of the respective engaging sections  46   a ,  46   a  (the dashed-dotted line γ shown in  FIGS. 34 and 35 ) are within the length range. That is, as shown in  FIGS. 34 and 35 , the dashed-dotted line γ lies between the dashed-dotted line α and the dashed-dotted line β. Therefore, even when the respective spring elements  26   g ,  26   h  are elastically deformed in the direction along which the returning sections  33   c ,  33   c  provided at both end portions thereof and the engaging sections  46   a ,  46   a  are made to come close to each other, as the respective pads  9   a ,  9   b  are mounted to the support  3 , the moment of a direction rotating about the diametrical axis of the rotor is not caused in the respective spring elements  26   g ,  26   h . Hence, it is possible to prevent the respective spring elements  26   g ,  26   h  from inadvertently separating from the pad clip  15   e.    
     Also, in the sixth embodiment, the direction along which the respective returning sections  33   c ,  33   c  press the respective pressure plates  10   a ,  10   a  and the direction along which the respective engaging sections  46   a ,  46   a  press the pad clips  15   e  are the substantially axial direction and are the opposite directions each other. Therefore, it is possible to effectively transfer the elastic urging force of the respective spring elements  26   g ,  26   h  to both the pads  9   a ,  9   b , as the force separating both the pads  9   a ,  9   b . Thus, even though a thick wire rod, particularly a member having high elastic urging force is not used as the respective spring elements  26   g ,  26   h , it is possible to securely separate both the pads  9   a ,  9   b . Accordingly, it is possible to suppress the processing cost of the respective spring elements  26   g ,  26   h  and to facilitate the mounting operation of the respective spring elements  26   g ,  26   h.    
     Also, in the sixth embodiment, the pad clip  15   e  is formed at both axial end portions, which are diametrically outer end portions, with folding sections  53 ,  53  having a substantially U-shaped section, which are opened in the diametrically outer side. The coil sections  27   c ,  27   c  configuring the respective spring elements  26   g ,  26   h  are latched to the respective folding sections  53 ,  53  (the folding section  53  is inserted into the coil section  27   c ). In the sixth embodiment, since the insertion direction of the engaging sections  46   a ,  46   a  into the respective engaging holes  45   a ,  45   a  and the latching direction of the respective coil sections  27   c ,  27   c  to the respective folding sections  53 ,  53  are the same, it is possible to facilitate the mounting operation of the respective spring elements  26   g ,  26   h . In the meantime, the leading end portions of the respective folding sections  53 ,  53  are provided with curved sections, so that a width size of an opening end portion of each folding section  53 ,  53  is made to be smaller than that of each coil section  27   c ,  27   c . Therefore, at a state where the respective coil sections  27   c ,  27   c  are latched to the respective folding sections  53 ,  53 , the respective coil sections  27   c ,  27   c  are not inadvertently separated from the respective folding sections  53 ,  53 . 
     Also, in the sixth embodiment, the hook-shaped constraining sections  24   c ,  24   c  having an opened lower part are provided at both axial end portions of the pad clip  15   e , which are diametrically outer end portions (shoulder sections of the pad clip  15   e ). The leading end portions (diametrically inner half portions, lower parts in  FIGS. 30 to 33 ) of the respective constraining sections  24   c ,  24   c  are circumferentially bent in the direction coming close to the pads  9   a ,  9   b . Also, the parts of the respective spring elements  26   g ,  26   h  between the respective coil sections  27   c ,  27   c  and the respective returning sections  33   c ,  33   c  are provided with a base end side linear section  54  having an abutting section  59  at a base end side part thereof, a curved section  30   b  and an extension arm section  32   c  in order from the respective coil sections  27   c ,  27   c . As shown in  FIG. 37 , at a state where the respective return springs  16   e  (spring elements  26   g ,  26   h ) are mounted to the respective pad clips  15   e  to thus configure the assemblies of the respective pad clips  15   e  and the respective return springs  16   e , the abutting sections  59 ,  59  of the respective spring elements  26   g ,  26   h  are abutted on the respective constraining sections  24   c ,  24   c . Also, at a state before both the pads  9   a ,  9   b  are mounted after the pad clips  15   e  and the respective spring elements  26   g ,  26   h  (assemblies of the pad clips  15   e  and the return springs  16   e ) are mounted to the support  3 , the abutting sections  59 ,  59  of the respective spring elements  26   g ,  26   h  are engaged (abutted) to the respective constraining sections  24   c ,  24   c , as shown with the solid line in  FIGS. 31 and 33 . 
     At a state where the abutting sections  59 ,  59  are engaged to the respective constraining sections  24   c ,  24   c , the respective constraining sections  24   c ,  24   c  prevent the respective returning sections  33   c ,  33   c  from displacing in the direction getting away from each other more than the state shown in  FIGS. 31 and 37  and both the constraining sections  24   c ,  24   c  hold the respective abutting sections  59 ,  59 . The constraining sections prevent parts of the respective spring elements  26   g ,  26   h  except for the returning sections  33   c ,  33   c  from being inclined to protrude toward the center of the support  3  in the circumferential direction of the rotor. At this state, when axially translating and mounting both the pads  9   a ,  9   b  to the support  3 , the respective spring elements  26   g ,  26   h  do not interfere with each other, so that it is possible to facilitate the mounting operation. In order to mount both the pads  9   a ,  9   b  to the support  3 , as shown in  FIGS. 34 to 36 , the bent sections  38  of the pad clip  15   e  are elastically deformed in a crushing direction by the circumferential end portions (engaging protruding pieces  21 ) of both the pads  9   a ,  9   b , as shown in  FIGS. 34 to 36 , and the circumferential end portions are pushed in the torque receiving sections  37  of the pad clip  15   e.    
     In correspondence to the pushing-in operation, while both the circumferential end portions of the pressure plate  10   a ,  10   b  of both the pads  9   a ,  9   b  elastically deform the respective returning sections  33   c ,  33   c  from a state shown in  FIG. 31  to a state shown in  FIG. 32  and from a state shown with the solid line to a state shown with the dashed-two dotted line in  FIG. 33 , the pads are mounted to the support  3 . In the meantime, the shape of the return spring  16   e  shown in  FIGS. 29 and 30  indicates the state where the respective pads  9   a ,  9   b  (and caliper  2 ) are elastically deformed and mounted to the support  3 . 
     The other configurations and operational effects are the same as those of the first embodiment. 
     Seventh Embodiment 
       FIGS. 38 to 43  show a seventh embodiment. In the meantime, the shape of the return spring  16   e  (inner spring element  26   g , outer spring element  26   h ) shown in  FIGS. 38 to 43  indicates a state where the pads  9   a ,  9   b  (refer to  FIGS. 1 to 3 , for example) are elastically deformed and mounted to the support  3 . In the seventh embodiment, a pad clip  15   f  is used in which the connection section  23   c  is omitted from the pad clip  15   e  of the sixth embodiment. Specifically, the pad clip  15   f  is configured by an inner clip element  49   c  and an outer clip element  49   d , which have the leg sections  22   c ,  22   c , respectively, and are separate elements. 
     In the seventh embodiment having the pad clip  15   f , at a state before the respective pads  9   a ,  9   b  are mounted to the support  3 , the inner spring element  26   g  and the outer spring element  26   h  configuring the return spring  16   e  are respectively mounted (preset) to the inner clip element  49   c  and the outer clip element  49   d , as shown in  FIG. 43 . That is, an assembly of the pad clip  15   f  (inner clip element  49   c  and outer clip element  49   d ) and the return spring  16   e  (inner spring element  26   g  and outer spring element  26   h ) is configured. Then, an inner assembly  50   c  configured by the inner clip element  49   c  and the inner spring element  26   g  and an outer assembly  50   d  configured by the outer clip element  49   d  and the outer spring element  26   h  are mounted to the support  3  separately (or at the same time). 
     In the seventh embodiment having the above configuration, like the sixth embodiment, it is possible to make the pad clip  15   f  (inner and outer clip elements  49   c ,  49   d ) smaller/lighter, compared to the configuration where the pad clip  15   e  is integrally formed. Therefore, it is possible to improve the handling property of each pad clip  15   f , thereby improving the mounting operability of the respective pad clips  15   f . Also, it is possible to reduce the material cost for forming the respective pad clips  15   f.    
     The other configurations and operational effects are the same as those of the first and sixth embodiments. 
     Eighth Embodiment 
       FIGS. 44 to 49  show an eighth embodiment. In the meantime, the shape of the return spring  16   e  (inner spring element  26   g , outer spring element  26   h ) shown in  FIGS. 44 to 49  also indicates the state where the pads  9   a ,  9   b  (refer to  FIGS. 1 to 3 , for example) are elastically deformed and mounted to the support  3 . In the eighth embodiment, a pad clip  15   g  is used in which the constraining sections  24   c ,  24   c  of the pad clip  15   e  of the sixth embodiment are replaced with the constraining sections  24 ,  24  of the pad clip  15   a  of the first embodiment. That is, the constraining sections  24 ,  24  of the pad clip  15   g  of the eighth embodiment are respectively formed by bending a central portion of the torque receiving section toward each of the pads  9   a ,  9   b  in the circumferential direction with extending in a direction axially separating from each of the torque receiving sections  37 ,  37  provided at the inner-diametrically biased parts of the leg sections  22 ,  22 . 
     Also in the eighth embodiment having the pad clip  15   g , when assembling the floating disc brake, the inner spring element  26   g  and the outer spring element  26   h  configuring the return spring  16   e  are respectively mounted (preset) to the pad clip  15   g , as shown in  FIG. 49 . That is, an assembly of the pad clip  15   g  and the return spring  16   e  (inner spring element  26   g  and outer spring element  26   h ) is configured. Then, as shown in  FIGS. 44 ,  45  and the like, the assembly of the pad clip  15   g  and the return spring  16   e  is mounted to the support  3 . 
     The other configurations and operational effects are the same as those of the first and sixth embodiments. 
     Ninth Embodiment 
       FIGS. 50 to 56  show a ninth embodiment. In the meantime, the shape of the return spring  16   e  (inner spring element  26   g , outer spring element  26   h ) shown in  FIGS. 50 to 56  also indicates the state where the pads  9   a ,  9   b  (refer to  FIGS. 1 to 3 , for example) are elastically deformed and mounted to the support  3 . In the ninth embodiment, a pad clip  15   h  is used in which the connection section  23   c  is omitted from the pad clip  15   g  of the eighth embodiment. Specifically, the pad clip  15   h  is configured by an inner clip element  49   e  and an outer clip element  49   f , which have the leg sections  22   d ,  22   d , respectively, and are separate elements. 
     In the ninth embodiment having the pad clip  15   h , at a state before the respective pads  9   a ,  9   b  are mounted to the support  3 , the inner spring element  26   g  and the outer spring element  26   h  configuring the return spring  16   e  are respectively mounted (preset) to the inner clip element  49   e  and the outer clip element  49   f , as shown in  FIG. 56 . That is, an assembly of the pad clip  15   h  (inner clip element  49   e  and outer clip element  49   f ) and the return spring  16   e  (inner spring element  26   g  and outer spring element  26   h ) is configured. Then, an inner assembly  50   e  configured by the inner clip element  49   e  and the inner spring element  26   g  and an outer assembly  50   f  configured by the outer clip element  49   f  and the outer spring element  26   h  are mounted to the support  3  separately (or at the same time). 
     In the ninth embodiment having the above configuration, like the eighth embodiment, it is possible to make the pad clip  15   h  (inner and outer clip elements  49   e ,  49   f ) smaller/lighter, compared to the configuration where the pad clip  15   g  is integrally formed. Therefore, it is possible to improve the handling property of each pad clip  15   h , thereby improving the mounting operability of the respective pad clips  15   h . Also, it is possible to reduce the material cost for forming the respective pad clips  15   h.    
     The other configurations and operational effects are the same as those of the first and eighth embodiments. 
     Although the invention has been specifically described with reference to the specific embodiments, it is obvious to one skilled in the art that a variety of changed and modifications can be made without departing from the spirit and scope of the invention. 
     This application is based on Japanese Patent Application Nos. 2010-090770 filed on Apr. 9, 2010, 2010-226785 filed on Oct. 6, 2012 and 2011-055045 filed on Mar. 14, 2011, the disclosures of which are incorporated herein by way of reference. 
     INDUSTRIAL APPLICABILITY 
     In the respective embodiments, the mounting method of mounting the return spring to the pad clip (the assembly of the pad clip and the return spring is configured) and then mounting the pad clip and the return spring to the support at the same time has been described. However, when implementing the invention, a mounting method of mounting the pad clip unitary body to the support and then mounting the return spring to the pad clip may be also implemented. 
     In the respective embodiments, the leg sections configuring the pad clip are respectively arranged between the support and the inner and outer pads, and when the braking is released, both the pads are separated from the rotor by using the elastic urging force of the return spring. However, the invention is not limited thereto. That is, the leg section configuring the pad clip may be arranged between the support and only one pad, and only the one pad may be separated from the rotor by using the elastic urging force of the return spring. When such configuration is adopted, only the assembly consisting of the inner clip element (or outer clip element) and the inner spring element (or outer spring element) is mounted to the support. The mounting position of the assembly having the elements can be freely selected, such as inner side, outer side, anchor side and opposite side to the anchor. Also, regarding the assemblies to be mounted at inner side, outer side, anchor side and opposite side to the anchor, it is possible to mount the assemblies having different configurations. 
     REFERENCE SIGNS LIST 
       1 : rotor 
       2 : caliper 
       3 : support 
       4 : guide pin 
       5 : guide hole 
       6 : boots 
       7 : rotation input side engaging section 
       8 : rotation output side engaging section 
       9   a ,  9   b : pad 
       10   a ,  10   b : pressure plate 
       11 : cylinder section 
       12 : claw section 
       13 : piston 
       14   a ,  14   b : lining 
       15 ,  15   a  to  15   h : pad clip 
       16 ,  16   a  to  16   e : return spring 
       17 ,  17   a ,  17   b : coil section 
       18 : engaging hole 
       19 : protruding piece 
       20 : engaging recess 
       21 : engaging protruding piece 
       22 ,  22   a ,  22   b ,  22   c ,  22   d : leg section 
       23 ,  23   a ,  23   b ,  23   c : connection section 
       24 ,  24   a ,  24   b ,  24   c : constraining section 
       25 : protruding piece 
       26   a ,  26   c ,  26   e ,  26   g : inner spring element 
       26   b ,  26   d ,  26   f ,  26   h : outer spring element 
       27 ,  27   a ,  27   b ,  27   c : coil section 
       28   a ,  28   c ,  28   e : inner arm section 
       28   b ,  28   d ,  28   f : outer arm section 
       29 ,  29   a : engaging section 
       30 ,  30   a ,  30   b : curved section 
       31 ,  31   a ,  31   b : abutting section 
       32 ,  32   a ,  32   b ,  32   c : extension arm section 
       33 ,  33   a ,  33   b ,  33   c : returning section 
       34 ,  34   a : recess 
       35 : connection arm section 
       36 ,  36   a : positioning step section 
       37 : torque receiving section 
       38 : bent section 
       39 ,  39   a : protrusion section 
       40 ,  40   a ,  40   b : deviation preventing section 
       41 : engaging notch 
       42 : outer diameter-side bent section 
       43 : inner diameter-side bent section 
       44 : folding section 
       45 ,  45   a : engaging hole 
       46 ,  46   a : engaging section 
       47 : base end portion 
       48 : bent section 
       49   a ,  49   c ,  49   e : inner clip element 
       49   b ,  49   d ,  49   f : outer clip element 
       50   a ,  50   c : inner assembly 
       50   b ,  50   d : outer assembly 
       51 : pressing piece 
       52 : gap 
       53 : folding section 
       54 : based end side linear section 
       55 : coil section 
       56 : return spring 
       57 : anti-rattle spring 
       58 : pressing section 
       59 : abutting section