Abstract:
A vehicle an electric parking brake mechanism including a power source, unshielded power wires connected to the power source and covered by an outer sheath, and a brake caliper configured to receive a power from the power source via the unshielded power wires, and an ABS mechanism including an ABS sensor detecting a rotation speed of a wheel, unshielded signal wires connected to the ABS sensor and covered by the outer sheath together with the unshielded power wires, and a control unit for conducting an ABS control based on a signal input from the ABS sensor via the unshielded signal wires.

Description:
[0001]    The present application is a Continuation Application of U.S. patent application No. 13/865,881, filed on Apr. 18, 2013, which is based on and claims priority from Japanese patent application Nos. 2012-096729 and 2012-215636 filed on Apr. 20, 2012 and Sep. 28, 2012, respectively, the entire contents of which are incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The invention relates to a complex harness for a vehicle. 
         [0004]    2. Description of the Related Art 
         [0005]    An ABS sensor used in an ABS (Anti-lock Brake System) of a vehicle is conventionally known. The ABS sensor is to measure a rotation speed of a wheel and a sensor portion (sensor head) of the ABS sensor is provided in the vicinity of the wheel. The sensor portion provided in the vicinity of the wheel is connected to a control device (electronic control unit) provided on a vehicle body via an ABS sensor cable. 
         [0006]    In recent years, an electric brake in which braking is controlled by electricity in place of hydraulic pressure is becoming popular. An electric parking brake (EPB) which is a motorized parking brake is also known and, in the present specification, the electric brake is meant to include also the electric parking brake. In the electric brake, a brake caliper (actuator) provided on a wheel is connected to a control device provided on a vehicle body via an electric brake cable (see, e.g., JP-A-2003-92028). 
       SUMMARY OF THE INVENTION 
       [0007]    The conventional ABS sensor cable and the electric brake cable are separately installed even though both cables are connected to substantially the same positions. Thus, the installation thereof is desired to be improved since the wiring space of the vehicle may be limited and the wiring work thereof may be thereby complicated. 
         [0008]    Accordingly, it is an object of the invention to provide a complex harness that allows the efficient use of the wiring space of a vehicle and the facilitation of the wiring work. 
         [0000]    (1) According to one embodiment of the invention, a complex harness comprises a composite cable comprising an electric brake cable, an ABS sensor cable and an outer sheath, 
         [0009]    wherein the electric brake cable and the ABS sensor cable are integrated by being commonly covered with the outer sheath. 
         [0010]    In the above embodiment (1) of the invention, the following modifications and changes can be made. 
         [0011]    (i) The complex harness further comprises a connector at an end portion of at least one of the electric brake cable and the ABS sensor cable, 
         [0012]    wherein the electric brake cable and the ABS sensor cable are separated at an end portion of the composite cable. 
         [0013]    (ii) The ABS sensor cable comprises two signal wires and an inner sheath to collectively cover the two signal wires. 
         [0014]    (iii) The outer sheath comprises a thermoplastic resin, and wherein the inner sheath comprises a crosslinked thermoplastic resin. 
         [0015]    (iv) The outer sheath comprises a thermoplastic urethane, and wherein the inner sheath comprises a crosslinked thermoplastic urethane. 
         [0016]    (v) The crosslinked thermoplastic urethane is formed by crosslinking the thermoplastic urethane with a silane coupling agent added thereto, and wherein the ABS sensor cable comprises a sensor portion of an ABS sensor integrated at an end of the ABS sensor cable by a resin mold. 
         [0017]    (vi) The complex harness further comprises a separator between the outer and inner sheaths to reduce a fusion-adhesion therebetween. 
         [0018]    (vii) The separator comprises a metal and is disposed covering the ABS sensor cable. 
         [0019]    (viii) The complex harness further comprises a shield conductor disposed covering a power wire of the electric brake cable. 
         [0020]    (ix) The electric brake cable is used as a conducting path for passing an electric current to operate a mechanism of preventing rotation of wheels after stopping a vehicle. 
       EFFECTS OF THE INVENTION 
       [0021]    According to one embodiment of the invention, a complex harness can be provided that allows the efficient use of the wiring space of a vehicle and the facilitation of the wiring work. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]    Next, the present invention will be explained in more detail in conjunction with appended drawings, wherein: 
           [0023]      FIGS. 1A and 1B  are diagrams illustrating a complex harness in an embodiment of the present invention, wherein  FIG. 1A  is a plan view and  FIG. 1B  is a cross sectional view taken on line  1 B- 1 B; 
           [0024]      FIG. 2  is a cross sectional view showing a complex harness in another embodiment of the invention; 
           [0025]      FIGS. 3A and 3B  are cross sectional views showing complex harnesses in another embodiment of the invention; and 
           [0026]      FIGS. 4A and 4B  are diagrams illustrating a complex harness in a modification of the invention, wherein  FIG. 4A  is a plan view and  FIG. 4B  is a cross sectional view taken on line  4 B- 4 B. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0027]    The embodiment of the invention will be described below in conjunction with the appended drawings. 
         [0028]      FIGS. 1A and 1B  are diagrams illustrating a complex harness in the present embodiment, wherein  FIG. 1A  is a plan view and  FIG. 1B  is a cross sectional view taken on line  1 B- 1 B. 
         [0029]    As shown in  FIGS. 1A and 1B , a complex harness  1  is provided with a composite cable  5  composed of an electric brake cable  2  and an ABS sensor cable  3  which are integrated by covering with a common outer sheath  4 . In addition, the complex harness  1  is configured such that the electric brake cable  2  and the ABS sensor cable  3  are separated at end portions of the composite cable  5  and a connector  6  is provided at an end portion of least at one of the cables  2  and  3 . 
         [0030]    The electric brake cable  2  is composed of two power wires  7  and is mainly used as a conducting path for passing an electric current which is caused to flow therethrough by pressing a given button after stopping a vehicle to operate a mechanism of preventing rotation of wheels (an electric parking brake (EPB) mechanism). In addition, it is obvious that the electric brake cable  2  can be a cable for a general electric brake other than for an electric parking brake (EPB) (e.g., a cable including a control signal wire, etc., in addition to the two power wires  7 ). 
         [0031]    The power wire  7  is formed by covering a center conductor  7   a  with an insulation  7   b.  The insulation  7   b  is formed of, e.g., XLPE (crosslinked polyethylene) or ETFE (tetrafluoroethylene-ethylene copolymer), etc. In the electric brake cable  2 , the two power wires  7  are generally covered with a sheath but, in the invention, the common outer sheath  4  is used in substitution for the sheath. 
         [0032]    Note that, in the present embodiment, it is defined that the composite cable  5  is composed of the electric brake cable  2  and the ABS sensor cable  3  which are integrated by covering with the common outer sheath  4  but it can be said, in other words, that the composite cable  5  is composed of the electric brake cable  2  and the ABS sensor cable  3  which is integrated therewith by being embedded into a sheath (the outer sheath  4 ) of the electric brake cable  2 . The two power wires  7  of the electric brake cable  2  extend from both end portions of the composite cable  5 . A connector  6   a  to be connected to a brake caliper (not shown) is provided at one of the end portions and a connector  6   b  to be connected to a control device (not shown) is provided at another end portion. A protector  8  formed of a tube or hose, etc., is provided around the two power wires  7  extending from the composite cable  5  on each side in order to provide a protection for the power wires  7  against chipping, etc., caused by a flipped stone. 
         [0033]    The ABS sensor cable  3  is formed by covering two signal wires  9  with an inner sheath  10  all together. The signal wire  9  is formed by covering a center conductor  9   a  with an insulation  9   b.  The insulation  9   b  is formed of, e.g., XLPE, etc. In the present embodiment, the ABS sensor cable  3  is provided so as to be in contact with the power wires  7 . 
         [0034]    In the present embodiment, the outer sheath  4  is formed of a thermoplastic resin, in more detail, a thermoplastic urethane, and the inner sheath  10  is formed of a crosslinked thermoplastic resin, in more detail, a crosslinked thermoplastic urethane. As shown in 
         [0035]      FIG. 1B , the outer sheath  4  is provided around the power wires  7  and the ABS sensor cable  3  so as to be interposed therebetween. Although the outer sheath  4  is formed by extrusion molding, it is possible to reduce melting of the inner sheath  10  due to heat and fusion-adhesion of the inner sheath  10  to the outer sheath  4  resulting therefrom at the time of forming the outer sheath  4  around the inner sheath  10  (at the time of extrusion molding) by crosslinking the inner sheath  10 . As a result, the ABS sensor cable  3  can be easily separated from and taken out of the outer sheath  4  at the end portions of the composite cable  5 . 
         [0036]    Since the thermoplastic urethane used for the outer sheath  4  and the inner sheath  10  is strong against chipping caused by a flipped stone, etc., portions covered with the sheaths  4  and  10  (around the composite cable  5  and around the ABS sensor cable  3  extruding from the composite cable  5 ) do not need to be covered with a protector. In addition, the thermoplastic urethane is easily bent and is suitable for the complex harness  1  which is used for a wiring under a spring and is repeatedly bent. 
         [0037]    Furthermore, in the present embodiment, a thermoplastic urethane having a silane coupling agent added thereto is crosslinked and is used as the inner sheath  10 , and a sensor portion (sensor head)  11  of the ABS sensor is integrated at an end of the ABS sensor cable  3  by a resin mold. Nylon is used as the resin mold. A connector  6   c  to be connected to a control device (not shown) is provided at another end of the ABS sensor cable  3 . 
         [0038]    In case that the thermoplastic urethane is crosslinked, it is not possible to ensure adhesion to the resin mold (nylon, in the present embodiment). However, by performing the crosslinking treatment after adding the silane coupling agent to the thermoplastic urethane, silane coupling agent is activated and this allows adhesion to the resin mold to be improved. As a result, it is possible to ensure adhesion between the inner sheath  10  and the sensor portion  11 , thereby reducing water intrusion into the sensor portion  11 . Accordingly, it is possible to reduce troubles of the sensor portion  11  such as breakdown. 
         [0039]    Grommets  12  to which a clamp for attaching the composite cable  5  to a vehicle body is fixed are attached to the composite cable  5 . The grommet  12  is formed of, e.g., EPDM (ethylene propylene diene rubber). An inner diameter of the grommet  12  is expanded by air for attaching the grommet  12  to the composite cable  5 , and at this time, it is difficult to attach the grommet  12  if the surface of the outer sheath  4  is not flat. Therefore, in the present embodiment, the outer sheath  4  is formed by performing extrusion molding twice to obtain the outer sheath  4  having a flat surface, thereby forming the composite cable  5  having a substantially regular outer shape. 
         [0040]    Effects of the present embodiment will be described. 
         [0041]    The complex harness  1  in the present embodiment is provided with the composite cable  5  composed of the electric brake cable  2  and the ABS sensor cable  3  which are integrated by covering with the common outer sheath  4 . 
         [0042]    Since the electric brake cable  2  and the ABS sensor cable  3  are integrated, it is possible to effectively use wiring space in a vehicle and to facilitate wiring work. In addition, it is possible to reduce the number of wiring parts, which facilitates parts control. 
         [0043]    In addition, in the present embodiment, the ABS sensor cable  3  is formed by covering the two signal wires  9  with the inner sheath  10  all together, the outer sheath  4  is formed of a thermoplastic resin and the inner sheath  10  is formed of a crosslinked thermoplastic resin. 
         [0044]    Therefore, it is possible to reduce melting of the inner sheath  10  due to heat and fusion-adhesion of the inner sheath  10  to the outer sheath  4  resulting therefrom at the time of forming the outer sheath  4  (at the time of extrusion molding), and accordingly, the ABS sensor cable  3  can be easily separated from and taken out of the outer sheath  4  at the end portions of the composite cable  5 . 
         [0045]    Furthermore, in the present embodiment, a thermoplastic urethane having a silane coupling agent added thereto is used as a material of the inner sheath  10 , and the sensor portion  11  of the ABS sensor is integrated at an end of the ABS sensor cable  3  by the resin mold. 
         [0046]    This allows the inner sheath  10  and the resin mold to be air-tightly integrated and it is thereby possible to reduce breakdown etc., of the sensor portion  11  due to water intrusion thereinto. In addition, the number of wiring parts is further reduced by integrally providing the sensor portion  11  at an end portion of the ABS sensor cable  3  and it is thus possible to further facilitate wiring work. 
         [0047]    Meanwhile, the electric brake cable  2  is used as a conducting path for passing an electric current which is caused to flow therethrough by pressing a given button after stopping a vehicle to operate a parking brake mechanism. Therefore, the ABS sensor cable  3  which is in operation during running a vehicle does not need measures against noise from the electric brake cable  2 . Therefore, it is possible to integrate the electric brake cable  2  with the ABS sensor cable  3  without providing a noise suppression shield on at least one of the electric brake cable  2  and the ABS sensor cable  3 . 
         [0048]    Next, another embodiment of the invention will be described. 
         [0049]    A complex harness  21  shown in  FIG. 2  is based on the complex harness  1  shown in  FIG. 1  and has a separator  22  provided between the outer sheath  4  and the inner sheath  10  to reduce fusion-adhesion thereof. 
         [0050]    By providing the separator  22 , the ABS sensor cable  3  can be easily separated from and taken out of the outer sheath  4  at the end portions of the composite cable  5  even when both of the outer sheath  4  around the inner sheath  10  are formed of a thermoplastic urethane. 
         [0051]    Furthermore, in case that the separator  22  is formed of a metal and is provided so as to cover the ABS sensor cable  3 , the separator  22  serves as a shield and this allows external noise into the signal wire  9  of the ABS sensor cable  3  to be reduced. Note that, a material of the separator  22  is not limited thereto and it is possible to use, e.g., non-woven paper, non-woven fabric (formed of, e.g., PET) or resin tape, etc. 
         [0052]    Complex harnesses  31  and  32  respectively shown in  FIGS. 3A and 3B  are based on the complex harness  1  shown in  FIG. 1  and have a shield conductor  33  provided so as to cover the two power wires  7  of the electric brake cable  2 .  FIG. 3A  shows a case where the shield conductor  33  is provided so as to cover all of the two power wires  7  and the ABS sensor cable  3  and  FIG. 3B  shows a case where the shield conductor  33  is provided so as to cover only the two power wires  7 . Both structures are adoptable. Alternatively, the shield conductor  33  may be provided so as to cover only the ABS sensor cable  3 . In case that the shield conductor  33  is provided so as to cover all of the power wires  7  and the ABS sensor cable  3  as shown in  FIG. 3A , an inclusion  34  is inserted inside the shield conductor  33 , i.e., around the power wires  7  and the ABS sensor cable  3 . Meanwhile, by providing the shield conductor  33  so as to cover only the two power wires  7  as shown in  FIG. 3B , it is possible to reduce noise into the ABS sensor cable  3  which is in operation during running a vehicle even when the electric brake cable  2  is also used for passing an electric current during running a vehicle to slow down the vehicle, not only after stopping the vehicle. This allows the electric brake cable  2  and the ABS sensor cable  3  to be integrated even when the electric brake cable  2  is also used for passing an electric current during running a vehicle to slow down the vehicle, not only after stopping the vehicle. 
         [0053]    Providing the shield conductor  33  allows radiation noise from the power wires  7  to be suppressed, thereby taking EMI (electromagnetic interference) measures. In addition, when providing the shield conductor  33 , the shield conductor  33  serves as a separator which separates the ABS sensor cable  3  from the outer sheath  4 , which reduces fusion-adhesion of the inner sheath  10  to the outer sheath  4  and allows the power wires  7  and the ABS sensor cable  3  to be easily separated. 
         [0054]    Furthermore, it is possible to provide non-woven paper, non-woven fabric (formed of, e.g., PET) or resin tape, etc., in place of the shield conductor  33  in  FIG. 3A . Providing the non-woven paper or non-woven fabric in place of the shield conductor  33  allows fusion-adhesion of the inner sheath  10  to the outer sheath  4  to be reduced, and at the same time, rubbing between the power wires  7  or the ABS sensor cable  3  and the outer sheath  4  to be reduced and the power wires  7  or the ABS sensor cable  3  to easily move (slip) in the outer sheath  4 , which reduces stress due to bending and thus allows flexing endurance to be improved. 
         [0055]    It should be noted that the invention is not intended to be limited to the above-mentioned embodiments, and it is obvious that the various kinds of modifications can be added without departing from the gist of the invention. 
         [0056]    For example, the ABS sensor cable  3  is formed by covering the two signal wires  9  with the inner sheath  10  all together in the embodiments, it is possible to omit the inner sheath  10  as shown in  FIGS. 4A and 4B . In this case, the signal wires  9  extend from the end portions of the composite cable  5  and it is therefore necessary to provide protectors  42  formed of a tube or hose, etc., on the exposed portions of the signal wires  9  in order to provide a protection against chipping, etc., caused by a flipped stone. However, in this case, adhesion of the insulation  9   b  of the signal wire  9  (e.g., XLPE) to the resin mold (e.g., nylon) is not good enough and it is not possible to integrate the sensor portion  11  by the resin mold. Therefore, a connector  43  is provided on the signal wires  9  at one end and the sensor portion  11  is connected to the connector. 
         [0057]    In addition, the electric brake cable  2  may also be covered with an inner sheath in the same manner as the ABS sensor cable  3  even though it is not mentioned in the embodiments. In this case, in order to prevent fusion-adhesion of the inner sheath to the outer sheath  4 , a crosslinked thermoplastic urethane is used for the inner sheath, or, a separator is interposed between the inner sheath and the outer sheath  4 . This allows the protector  8  to be omitted and wiring work to be facilitated. 
         [0058]    Furthermore, although the outer sheath  4  formed of a thermoplastic urethane has been described in the embodiments, it is not limited thereto and the outer sheath  4  may be formed of EPDM. Since compression set (creep) is less likely occur in EPDM, forming the outer sheath  4  from the EPDM allows a clamp to be directly fixed to the outer sheath  4  without attaching the grommet  12  and it is thus possible to further facilitate wiring work. Note that, since compression set (creep) is likely occur in the thermoplastic resin, it is not possible to directly fix a clamp thereto and the grommet  12  needs to be provided. 
         [0059]    Still further, it is obviously possible to integrate another insulated wire such as disconnection detection line in addition to the electric brake cable  2  and the ABS sensor cable  3  even though it is not mentioned in the embodiments.