Patent Publication Number: US-2017350461-A1

Title: Disc brake device

Description:
TECHNICAL FIELD 
     The present invention relates to a disc brake apparatus. 
     BACKGROUND ART 
     As a disc brake apparatus incorporating a floating caliper in which braking torque of an outer pad is borne via pins which are fixed to a support member, disc brake apparatuses are known which are configured as disclosed in Patent Document 1 and Patent Document 2. 
     The disc brake apparatus disclosed in Patent Document 1 adopts a configuration in which an inner pad is supported by a support member and an outer pad is supported by anchor pins. The outer pad is supported by the anchor pins being inserted through through holes provided in lug portions of a pressure plate which makes up the outer pad. When the brakes are applied, pulling force is applied to the anchor pin which is situated on the rotor entrance side, while pushing force is applied to the anchor pin which is situated on the rotor exit side of the support member. 
     The disc brake apparatus disclosed in Patent Document 2 adopts a configuration in which an inner pad and an outer pad are both supported by anchor pins. The supporting form of the pads by the anchor pins is similar to that of the configuration disclosed in Patent Document 1, and the anchor pins are inserted through through holes provided in a pressure plate. In the disc brake apparatus configured in this way, when the brakes are applied, pulling force, pushing force or both the pulling force and the pushing force are applied to the inner pad and the outer pad. 
     PRIOR ART LITERATURES 
     Patent Documents 
     
         
         [Patent Document 1] JP-A-2012-172741 
         [Patent Document 2] WO2014/020941 
       
    
     SUMMARY OF THE INVENTION 
     Problem that the Invention is to Solve 
     In both the disc brake apparatuses having the characteristics described above, the configuration of the support members is simplified, which can realize the reduction in both size and weight of the disc brake apparatuses as a whole. 
     In the disc brake apparatus disclosed in Patent Document 1, however, when the brakes are applied, the braking torque of the outer pad is borne by the anchor pins, and in the disc brake apparatus disclosed in Patent Document 2, the braking torque of both the inboard and outer pads is borne by the anchor pins. Due to this, there is a possibility that the anchor pins and the support member which supports the anchor pins are deformed. Then, in the event that the anchor pins and the support member are deformed, there is caused a change in caliper posture (a tilting phenomenon), leading to a problem that in the caliper whose posture is changed, the linings which make up the pads tend to be worn in an eccentric fashion. 
     Then, the invention has been made in these situations and an object thereof is to provide a disc brake apparatus which can prevent pins and a support member from being deformed while realizing the bearing of braking torque by the pins by solving the problem described above and simplifying the configuration of the support member. 
     Means for Solving the Problem 
     The above object of the invention is achieved by the following configurations. 
     (1) A disc brake apparatus having: a support member; a slide member disposed along an axial direction of a rotor and having an inner slide portion on an inner side of the support member and an outer slide portion on an outer side of the support member; and a caliper which is held so that tangential force of an outer pad is transmitted to a claw portion and which is supported on the slide member, in which the caliper includes: an outer transmission surface which transmits braking torque generated in the outer pad to the outer slide portion; and an inner transmission surface which transmits the braking torque to the inner slide portion. 
     (2) The disc brake apparatus configured as described under (1) above, in which the slide member is made up of the inner slide portion and the outer slide portion which are separate members, and in which a constituent member of the inner slide portion and a constituent member of the outer slide portion are fastened together with the support member held therebetween. 
     Even when the support member is formed thin, it is possible to ensure a sufficient fastening margin and fix the slide members, by this configuration. 
     (3) The disc brake apparatus configured as described under (1) or (2) above, in which the outer slide portion is made up, of a large diameter portion and a small diameter portion which are provided along an axial direction of the slide member, of the large diameter portion. 
     By adopting this configuration, a distance can be made constant which is defined between a portion where the outer slide portion and the caliper are brought into contact with each other (that is, a connecting portion of the outer transmission surface with the outer slide portion) and the support member. Namely, even in the event that the pad wears, causing the caliper to deflect in the axial direction of the rotor, there is caused no change in the distance between the contact portion and the support member and the contact range thereof. Thus, the application of the braking torque can be maintained constant. 
     (4) The disc brake apparatus configured as described under any one of (1) to (3) above, in which the caliper is allowed to slide in the axial direction of the rotor via the inner slide portion, and in which the inner slide portion has a sleeve which is interposed between a sliding portion of the caliper and the inner slide portion. 
     By adopting this configuration, it is possible to prevent the wear of the inner slide portion itself. In addition, in the event that the sleeve wears, only the sleeve can be replaced with another sleeve. 
     (5) The disc brake apparatus configured as described under any one of (1) to (4) above, in which a first gap is provided between the outer slide portion and the outer transmission surface, a second gap is provided between the inner slide portion and the inner transmission surface, and the second gap is set to be wider than the first gap. 
     In the event that this configuration is adopted, braking torque is transmitted to the outer slide portion via the outer transmission surface, whereafter the braking torque is transmitted to the inner slide portion via the inner transmission surface. 
     (6) The disc brake apparatus configured as described under any one of (1) to (5) above, in which a first gap is provided between the outer slide portion and the outer transmission surface, a second gap is provided between the inner slide portion and the inner transmission surface, and in each of the first gap and the second gap, a gap situated on an exit side of the caliper where the rotor exits when it rotates is set to be wider than a gap situated on an entrance side where the rotor enters when it rotates. 
     In the event that this configuration is adopted, when braking torque is inputted into the support member, the anchoring is executed from the pull anchor to the pull anchor and then to the push anchor in that order both on the outer side and the inner side of the support member. 
     (7) The disc brake apparatus configured as described under any one of (1) to (6) above, in which the outer transmission surface is an enclosing portion which encloses an outer circumference of the outer slide portion, and the enclosing portion encloses the outer circumference of the outer slide portion over a range of 180 degrees or greater including a braking torque transmission point to the outer slide portion. 
     By adopting this configuration, even in the event that the enclosing portion is formed thin in thickness, the outer slide portion can be held by part of the caliper in an ensured fashion. Thus, a good holding performance of the caliper can be maintained. 
     (8) The disc brake apparatus configured as described under any one of (1) to (7) above, in which the outer pad is fastened to the claw portion. 
     By adopting this configuration, the outer pad and the claw portion can be treated as an integral part. Thus, the braking torque which in inputted into the outer pad can be transmitted to the outer slide portion and the inner slide portion via the caliper. 
     Advantageous Effect of Invention 
     According to the disc brake apparatus configured as described heretofore, even in the event that the configuration of the support member is simplified and that the torque bearing construction is adopted in which the braking torque is borne by the pins, it is possible to prevent the deformation of the pins and the support member. Thus, it is also possible to suppress the occurrence of eccentric wear that would otherwise be caused by the deformed pins or support member. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a front view of a disc brake apparatus according to an embodiment of the invention showing a front configuration thereof. 
         FIG. 2  is a plan view of the disc brake apparatus shown in  FIG. 1  showing a top configuration thereof. 
         FIG. 3  is a right side view of the disc brake apparatus shown in  FIG. 1  showing a right side configuration thereof. 
         FIG. 4  is a sectional view of the disc brake apparatus according to the embodiment of the invention taken along a line B-B shown in  FIG. 2 . 
         FIG. 5  is an exploded perspective view of the disc brake apparatus shown in  FIG. 1 . 
         FIG. 6  is a sectional view of the disc brake apparatus according to the embodiment taken along a line A-A shown in  FIG. 1 . 
         FIG. 7  is a sectional view corresponding to the sectional view taken along the line A-A shown in  FIG. 1 , which shows a first modified example of the disc brake apparatus according to the embodiment of the invention. 
         FIG. 8  is a sectional view corresponding to the sectional view taken along the line A-A shown in  FIG. 1 , which shows a second modified example of the disc brake apparatus according to the embodiment of the invention. 
     
    
    
     Mode For Carrying Out The Invention 
     Hereinafter, a disc brake apparatus according to an embodiment of the invention will be described in detail by reference to the drawings. 
     According to a basic configuration of a disc brake apparatus  10  of this embodiment, the disc brake apparatus  10  has a support member  12 , slide members  22  which are supported by this support member  12 , and a caliper  30  which is supported via the slide members  22 . 
     The support member  12  is fixed to a vehicle body and plays a role of supporting the caliper  30  slidably. In this embodiment, the support member  12  is disposed between a cylinder portion  32  (an inboard body) and a claw portion  36  (an outboard body) of the caliper  30  (in other words, within a frame of the caliper  30 ). The support member  12  includes, at least, anchors  14   a ,  14   b , a bridge  16 , mounting holes  18  and slide member mounting portions  20  (refer to  FIG. 5 ). The anchors  14   a ,  14   b  are disposed on a rotating rotor entrance side and a rotating rotor exit side of the support member  12 , respectively, where a rotor  60  enters and exits when it rotates. In this embodiment, the anchors  14   a ,  14   b  support an inner pad  46  and function as torque bearing portions which bear force which attempts to rotate the inner pad  46  together with the rotor  60  when the brakes are applied. The inner pad  46  is made up of a pressure plate  48  which is made of a sheet of steel and a lining  50  which is a frictional member. The inner pad  46  is supported on the support member  12  via part of the pressure plate  48 . 
     The bridge  16  is a connecting member which connects together the anchor  14   a  which is disposed on the rotating rotor entrance side and the anchor  14   b  which is disposed on the rotating rotor exit side of the support member  12  where the rotor  60  enters and exits when it rotates. The mounting holes  18  are holes which are provided in connecting portions between the anchors  14   a ,  14   b  and the bridge  16  for passage of bolts (not shown) which are screwed into mounting holes (not shown) provided on the vehicle body to thereby fasten the support member  12  to the vehicle body. 
     The slide member mounting portions  20  are through holes which are provided at distal ends of the pair of anchors  14   a ,  14   b  in positions which lie further radially outwards than an outer circumference of the rotor  60  when the rotor  60  is assembled to the disc brake apparatus  10 . The slide members  22  are mounted in the corresponding slide member mounting portions  20 , and torque caused in an outer pad  52 , which will be described in detail later, is transmitted to the slide members  22 . 
     The slide members  22  according to this embodiment are each made up of a guide pin  24  which makes up an inner slide portion which is situated on an inner side of the support member  12  and an anchor pin  26  which makes up an outer slide portion which is situated on an outer side of the support member  12 . In this embodiment, a sleeve  28  (refer to  FIG. 5 ), which makes up the inner slide portion, is disposed on an outer circumference of the guide pin  24 . In addition, the caliper  30 , which will be described in detail later, is configured so as to slide along an outer circumference of the sleeve  28 . The anchor pin  26  includes a small diameter portion  26   a  and a large diameter portion  26   b  which are disposed in the order from a proximal end portion to a distal end portion of the anchor pin  26 . The large diameter portion  26   b  functions as the outer slide portion. As a result of the anchor pin  26  including the large diameter portion  26   b  and the outer diameter portion  26   b  configured to function as the outer slide portion, even in the event that the outer pad  52 , which will be described in detail later, wears, a distance from a contact portion (including a contact length and a contact position) with an outer transmission surface  36   d  to the support member  12  can be maintained constant. This can stabilize the application of braking torque applied when the brakes are applied. 
     In this embodiment, the guide pin  24  and the anchor pin  26  are separate members. Then, a proximal end side internally threaded portion  26   c  of the anchor pin  26  is screwed on a proximal end side externally threaded portion  24   a  of the guide pin  24  which is inserted through the slide member mounting portion  20  provided in the support member  12 , whereby the guide pin  24  and the anchor pin  26  are fixed to the support member  12  with the support member  12  held therebetween. By adopting this configuration, even when the support member  12  is formed thin, it is possible to ensure a sufficient assembling margin between the guide pin  24  and the anchor pin  26 . 
     The caliper  30  according to this embodiment has the cylinder portion  32 , the claw portion  36  and a back body portion  34  (a bridge). The cylinder portion  32  constitutes a drive source for the disc brake apparatus  10  according to this embodiment and a piston  38  and a cylinder  32   a  which accommodates the piston  38  and from which the piston  38  is caused to project. In addition, support portions  32   b  are provided on the cylinder portion  32 , and the support portions  32   b  have through holes through which the guide pins  24  are inserted. The through holes in the support portions  32   b  are provided so as to be situated further radially outwards than the outer circumference of the rotor  60  with the caliper  30  assembled to the disc brake apparatus  10 . The reason that the through holes are so formed is that the guide pins  24  which are inserted therethrough are situated further radially outwards than the outer circumference of the rotor  60  so as to avoid the interference of the guide pins  24  with the rotor  60 . 
     An inner transmission surface  32   c  is provided on an inner circumferential surface of the through hole of each support portion  32   b  so as to transmit braking torque to the sleeve  28  (the guide pin  24  via the sleeve  28 ). Boots  40 ,  42  are provided on each support portion  32  which slides over the sleeve  28  so as to be aligned along a sliding direction, and an outer circumference (that is, a sliding surface) of the sleeve  28  are covered by these boots  40 ,  42 . By adopting this configuration, the sliding surface can be kept from dust attempting to adhere thereto. The inner transmission surface  32   c  has a bore diameter which is determined so that the inner transmission surface  32  loosely fits on the outer circumference of the sleeve  28 . Then, gaps A 1 , A 2  are defined between the sleeve  28  and the inner transmission surface  32   c  due to thicknesses of boot fixing portions  40   a ,  42   a , the sleeve  28  is located from the support portion  32   b . 
     The claw portion  36  bears reaction force generated as a result of pressing force generated by the piston  38 . A cutout portion  36   a  is provided in the claw portion  36  in a position which corresponds to a position on the cylinder portion  32  where the cylinder  32   a  is formed. This is because an inner circumference of the cylinder  32   a  of the cylinder portion  32  is worked by making use of the cutout portion  36   a . Blocks (two blocks in this embodiment) which make up the claw portion  36  each have a through hole  36   b  through which a bolt  44  is inserted. The through hole  36   b  is desirably formed as a stepped hole which keeps a bolt head of the bolt  44  used for fastening from projecting to an exterior portion. The caliper  30  is disposed in a limited space defined between the rotor  60  and an inner wall of a wheel. Due to this, the interference of the caliper  30  with the wheel can be suppressed by reducing the number of projecting portions from the caliper  30 , and the formation of a flat surface on the caliper  30  leads to an improvement in aesthetic appearance thereof. 
     The outer pad  52  is fastened to an inner side of the claw portion  36 . Similar to the inner pad  46 , the outer pad  52  is made up of a pressure plate  54  of a sheet of steel and a lining  56  which is formed of frictional material. Due to this, by fastening the outer pad  52  to the claw portion  36 , not only can the rigidity of the claw portion  36  be enhanced, but also the claw portion  36  and the outer pad  52  can be treated as an integral part. 
     By fastening the outer pad  52  to the claw portion  36 , the tangential force of the outer pad  52  is transmitted to the claw portion  36 . Due to this, braking torque generated by the frictional force of the outer pad  52  is then transmitted to the anchor pins  26  and the guide pins  24  via the caliper  30 . 
     Rear enclosing portions  36   c  for enclosing the distal end portions (the large diameter portions  26   b ) of the anchor pins  26  are provided in positions of the claw portion  36  which correspond to the support portions. The enclosing portions  36   c  make up the outer transmission surfaces  36   d  which transmit braking torque generated by the frictional force of the outer pad  52  when the brakes are applied to the anchor pins  26 . The enclosing portions  36   c  are each formed so as to cover an outer circumference of the anchor pin  26  over a range of 180 degrees or wider including a braking torque transmission point to the anchor pin  26 . By enclosing the outer circumference of the anchor pin  26  over the range of 180 degrees or greater, a good holding performance of the caliper  30  can be maintained, while reducing the thickness of the portion which makes up the enclosing portion  36   c . In order to mitigate the assembling and working accuracy at which the pair of anchor pins  26  are disposed, slight gaps B 1 , B 2  are provided between the anchor pins  26  and the corresponding rear enclosing portions  36   c  when the brakes are not applied. 
     The enclosing portions  36   c  are provided so that the outer transmission surfaces  36   d  are situated further inboards (that is, closer to the rotor  60 ) than the pressure plate  54  of the outer pad  52 . By adopting this configuration, when the braking torque is transmitted to the anchor pins  26 , the braking torque is so transmitted more in the position situated inboards of the pressure plate  54  than transmitted directly from the pressure plate  54 . Due to this, a distance from the support member  12  to the torque transmission point becomes short, whereby a load applied to the anchor pins  26  is reduced. Consequently, it is possible to suppress the deformation of the anchor pins  26  and the deflection of the support member  12 . 
     The back body portion  34  is an element which straddles the rotor  60  in a position lying further radially outwards than the outer circumference thereof to connect the cylinder portion  32  and the claw portion  36 . 
     In the disc brake apparatus  10  configured in the way described above, the caliper  30  is supported on the sleeves  28  which are disposed on the outer circumferences of the guide pins  24  via the boots  40 ,  42 . In the case of this embodiment, when comparing the gaps A (A 1 , A 2 ) with the gaps B (B 1 , B 2 ), the gaps B are configured so as to be smaller than the gaps A. In the gaps A and the gaps B, the gaps (the gap A 1 , the gap B 1 ) situated closer to a rotating rotor entrance side of the caliper  30  where the rotor  60  enters when it rotates are smaller than the gaps (the gap A 2 , the gap B 2 ) situated closer to a rotating rotor exit side of the caliper  30  where the rotor  60  enters and exits when it rotates. Due to this, the relationship in terms of size of the gap A 1  to the gap B 2  can be described as B 1 &lt;B 2 &lt;A 1 &lt;A 2 . 
     In the disc brake apparatus  10  configured in the way described above, the caliper  30  is supported via the boots  40 ,  42  which are provided on the guide pins  24  when the brakes are not applied. Then, when the brakes are applied, the caliper  30  bears the tangential force of the outer pad  52  and is then caused to slide in a rotational direction (R) of the rotor  60  to thereby be brought into contact with the slide members  22 . Here, when the sizes of the gaps A 1  to B 2  are caused to differ, the number of transmission surfaces which come into contact with the slide members  22  changes in accordance to the magnitude of the braking torque. 
     Specifically, the number of transmission surfaces will change as follows. Firstly, in an initial stage of braking, the outer transmission surface  36   d  which is situated on the rotating rotor entrance side where the rotor  60  enters when it rotates is brought into contact with the anchor pin  26  (whereby the gap B 1  is eliminated). When the braking torque is applied further, the outer transmission surface  36   d  which is situated on the rotating rotor exit side where the rotor  60  exits when it rotates is brought into contact with the anchor pin  26  (whereby the gap B 2  is eliminated). 
     Then, when the braking toque applied becomes greater, the inner transmission surface  32   c  which is situated on the rotating rotor entrance side is brought into contact with the guide pin  24  (the sleeve  28 ) (whereby the gap A 1  is eliminated). When the braking torque applied becomes far greater, the inner transmission surface  32   c  on the rotating rotor exist side is brought into contact with the guide pin  24  (the sleeve  28 ) (whereby the gap A 2  is eliminated). Thus, all the four transmission surfaces are brought into function. 
     In the disc brake apparatus  10  of this embodiment, the anchor pins  26  which make up the outer slide portions and the guide pins  24  which make up the inner slide portions are disposed on the outer side and the inner side of the support member  12 , respectively. Namely, the braking torque is designed to be inputted in a dispersed fashion in accordance to the magnitude of the tangential force applied to the outer pad  52 . Due to this, even in the event that great tangential force is applied to the outer pad  52 , there are no fears that the anchor pins  26  are deformed. 
     Since the configuration is adopted in which the braking force is dispersed to the anchor pins  26  which are provided on the outer side of the support member  12  and the guide pins  24  which are provided on the inner side of the support member  12 , torsional force indicated by an arrow (A) in  FIG. 6  is mitigated, thereby making it possible to suppress the distortion of the support member  12 . 
     Consequently, it is possible to prevent the occurrence of a tilting phenomenon of the caliper  30  attributed to the deformation of the anchor pins  26  and the support member  12 . Thus, it is also possible to suppress the occurrence of eccentric wear of the pads (the inner pad  46  and the outer pad  52 ) which would otherwise be caused by the tilting phenomenon of the caliper  30 . 
     In the figures, as a preferred mode for carrying out the invention, one of the specific modes is illustrated. However, provided that the working effects described above can be obtained, there is imposed no limitation to the external appearances or forms and materials of the support member  12  and the caliper  30 . 
     In the embodiment, the relationship in terms of size of the gaps A 1  to B 2  is described as B 1 &lt;B 2 &lt;A 1 &lt;A 2 . However, the relationship can be set differently depending upon whether the anchoring of the tangential force or the braking torque when the brakes are applied is triggered by the push anchor or the pull anchor. For example, even through the relationship in terms of size of the gaps is set as B 2 &lt;B 1 &lt;A 2 &lt;A 1 , the setting can be regarded as constituting part of the invention. 
     In the disc brake apparatus  10  according to this embodiment, when the brakes are applied, the caliper  30  slides in the rotational direction (R) of the rotor  60 . Due to this, in the event that the magnitude of the gaps A (A 1 , A 2 ) is made equal to the magnitude of the gaps B (B 1 , B 2 ), the inner transmission surfaces  32   c  and the outer transmission surfaces  36   d  are brought into contact with the guide pins  24  and the anchor pins  26  at the same time. Even in the event that this configuration is adopted, the configuration can be regarded as constituting part of the invention. 
     In the embodiment, the outer pad  52  is described as being fixed to the claw portion  36  with the bolts  44 . However, other fastening means than the means using the bolts  44  may be adopted including a fitting making use of irregularities, as long as a configuration adopted can transmit the tangential force applied to the outer pad  52  to the claw portion  36 . 
     Next, referring to  FIG. 7 , a first modified example made to the disc brake apparatus according to the invention will be described.  FIG. 7  is a sectional view showing a configuration corresponding to the configuration of the embodiment shown in  FIG. 6 . In the embodiment described above, the sleeves  28  (refer to  FIG. 6 ) are provided on the outer circumferences of the guide pins  24  which make up the inner slide portions. In contrast with this, the following configuration is adopted in this modified example. The sleeves  28  are deleted, and guide pins  24  having a larger diameter are used instead. Then, support portions  32   b  slide over outer circumferences of the guide pins  24 , and inner transmission surfaces  32   c  are brought into contact with the outer circumferences of the guide pins  24 . 
     Even in the event that the inner slide portions are configured in the way described above, similar advantageous effects to those of the embodiment can be obtained. In addition, since the sleeves  28  can be deleted, the number of parts needed to be assembled and the number of assembling steps can be reduced accordingly. 
     Next, referring to  FIG. 8 , a second modified example will be described. In the modified example shown in  FIG. 8 , an inner slide portion and an outer slide portion are formed into an integral slide member  22 . 
     In the case of this modified example, the slide member  22  is screwed into a support member  12  for assemblage to the support member  12 . Due to this, an internal thread is formed on a slide member mounting portion  20  of the support member  12 . In addition, an externally threaded portion  22   c  is provided on the slide member  22  between a guide pin constituting portion  22   a  which constitutes the inner slide portion and an anchor pin constituting portion  22   b  which constitutes the outer slide portion. 
     In the slide member  22  configured as described above, a proximal end face of the guide pin constituting portion  22   a  constitutes a reference point for use in determining the length of an anchor pin  26 . Due to this, a proximal end portion of the guide pin constituting portion  22   a  is formed greater in diameter than an internally threaded hole in the slide member mounting portion  20 , and the proximal end face thereof is configured to be brought into abutment with a planar plane of the support member  12 . 
     Even in the event that the slide member  22  is formed in this way, a similar advantageous effects to those of the embodiment can be obtained. In addition, since the guide pin constituting portion  22   a  and the anchor pin constituting portion  22   b  are formed integral, the number of parts needed to be assembled and the number of assembling steps can be reduced. 
     Here, the characteristics of the embodiment of the disc brake apparatus according to the invention will be briefly summarized by item by item below. 
     [1] A disc brake apparatus having: 
     a support member; 
     a slide member disposed along an axial direction of a rotor and having an inner slide portion on an inner side of the support member and an outer slide portion on an outer side of the support member; and 
     a caliper which is held so that tangential force of an outer pad is transmitted to a claw portion and which is supported on the slide member, 
     wherein the caliper includes:
         an outer transmission surface which transmits braking torque generated in the outer pad to the outer slide portion; and   an inner transmission surface which transmits the braking torque to the inner slide portion.       

     [2] The disc brake apparatus configured as described under [1] above, wherein the slide member is made up of the inner slide portion and the outer slide portion which are separate members, and wherein 
     the constituent member of the inner slide portion and the constituent member of the outer slide portion are fastened together with the support member held therebetween. 
     [3] The disc brake apparatus configured as described under [1] or [2] above, wherein the outer slide portion is made up, of the large diameter portion and the small diameter portion which are provided along the axial direction of the slide member, of the large diameter portion. 
     [4] The disc brake apparatus configured as described under any one of [1] to [3] above, wherein 
     the caliper is allowed to slide in the axial direction of the rotor via the inner slide portion, and wherein 
     the inner slide portion has the sleeve which is interposed between the sliding portion of the caliper and the inner slide portion. 
     [5] The disc brake apparatus configured as described under any one of [1] to [4] above, wherein 
     the first gap is provided between the outer slide portion and the outer transmission surface, wherein 
     the second gap is provided between the inner slide portion and the inner transmission surface, and wherein 
     the second gap is set to be wider than the first gap. 
     [6] The disc brake apparatus configured as described under any one of [1] to [5] above, wherein 
     the first gap is provided between the outer slide portion and the outer transmission surface, wherein 
     the second gap is provided between the inner slide portion and the inner transmission surface, and wherein 
     in each of the first gap and the second gap, the gap situated on the exit side of the caliper where the rotor exits when it rotates is set to be wider than the gap situated on the entrance side where the rotor enters when it rotates. 
     [7] The disc brake apparatus configured as described under any one of [1] to [6] above, wherein 
     the outer transmission surface is the enclosing portion which encloses the outer circumference of the outer slide portion, and wherein 
     the enclosing portion encloses the outer circumference of the outer slide portion over the range of 180 degrees or greater including the braking torque transmission point to the outer slide portion. 
     [8] The disc brake apparatus configured as described under any one of [1] to [7] above, wherein the outer pad is fastened to the claw portion. 
     The disc brake apparatus of the invention is not limited to the embodiment described heretofore and hence can be modified or improved as required. In addition, the materials, shapes, dimensions, numbers, arranging positions and the like of the constituent elements of the embodiment are arbitrary and are not limited thereto, provided that the invention can be attained by those constituent elements. 
     This patent application is based on Japanese Patent Application (No. 2014-233810) filed on Nov. 18, 2014, the contents of which are incorporated herein by reference. 
     INDUSTRIAL APPLICABILITY 
     According to the disc brake apparatus of the invention, even in the event that the configuration of the support member is simplified and that the torque bearing construction is adopted in which the braking torque is borne by the pins, it is possible to prevent the deformation of the pins and the support member. Thus, it is also possible to suppress the occurrence of eccentric wear that would otherwise be caused by the deformed pins or support member. 
     DESCRIPTION OF REFERENCE NUMERALS AND SIGNS 
       10 : disc brake apparatus;  12 : support member;  14   a : anchor;  14   b : anchor;  16 : bridge;  18 : mounting hole;  20 : slide portion mounting portion;  22 : slide member;  22   a : guide pin constituting portion;  22   b : anchor pin constituting portion;  22   c : externally threaded portion;  24 : guide pin;  24   a : proximal end side externally threaded portion;  26 : anchor pin;  26   a : small diameter portion;  26   b : large diameter portion;  28 : sleeve;  30 : caliper;  32 : cylinder portion;  32   a : cylinder;  32   b : support portion;  32   c : inner transmission surface;  34 : back body portion;  36 : claw portion;  36   a : cutout portion;  36   b : through hole;  36   c : rear enclosing portion;  36   d : outer transmission surface;  38 : piston;  40 : boot;  40   a : boot fixing portion;  42 : boot;  42   a : boot fixing portion;  44 : bolt;  46 : inner pad;  48 : pressure plate;  50 : lining;  52 : outer pad;  54 : pressure plate;  56 : lining;  60 : rotor.