JP2005155656A - Vehicular disk brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the assembling performance of a retainer and to prevent the retainer from shaking during traveling by surely mounting the retainer to a pad guide groove. <P>SOLUTION: Recessed parts 3d, 3d are formed to the inner/outer faces in the radial direction of a disk at the back part of the pad guide groove 3c provided to a caliper bracket 3. Protruding parts 7b, 7b to be fitted to the recessed parts 3d, 3d respectively are formed to the retainer 7 mounted to the pad guide groove 3c. Protruding pieces 15d, 15d to be fitted to the recessed parts 3d, 3d, in which the protruding parts 7b, 7b are mounted, are formed to a lug piece 15b protruded to the back plate 15 of a friction pad 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle disc brake mounted on various vehicles such as an automobile, a motorcycle, and a motorcycle, and more specifically, a pair of friction pads sandwiching a disc rotor is supported in a pad guide groove via a retainer. In addition, the present invention relates to a structure for supporting the friction pad so as to be movable in the disk axial direction.

  Conventionally, ear pieces protruding from the back plates of a pair of friction pads arranged opposite to each other with a disc rotor interposed therebetween are supported via a retainer in a pad guide groove formed in either a caliper body or a caliper bracket, In a vehicle disk brake that supports the friction pad so as to be movable in the disk axial direction, a U-shaped retainer guide portion is inserted into a U-shaped pad guide groove, and the guide portion On the inner side, an ear piece formed in a substantially rectangular shape is attached.

The retainer is attached by simply inserting the guide portion into the pad guide groove (for example, refer to Patent Document 1), or attaching the guide portion to the pad guide groove using an adhesive (for example, Patent Document 1). 2).
JP 2000-110862 A Japanese Utility Model Publication No. 54-97678

  However, when the above-described retainer guide portion is simply inserted into the pad guide groove, the retainer may fall off during assembly work or may rattle during running. Further, when the retainer is attached to the pad guide groove using an adhesive, the assembling work is troublesome, and the adhesive may be peeled off due to running vibration or the like, and the retainer may be rattled.

  SUMMARY OF THE INVENTION The present invention provides a vehicle disc brake that has a simple structure, can securely mount the retainer in the pad guide groove, improves the assembly of the retainer, and does not rattle the retainer during traveling. The purpose is that.

  In order to achieve the above object, in the present invention, an ear piece protrudes from the back plate of a pair of friction pads arranged opposite to each other with a disc rotor interposed therebetween, and the ear piece is formed on either the caliper body or the caliper bracket. In a vehicle disc brake supported by a pad guide groove via a retainer and supporting the friction pad so as to be movable in the disc axial direction, recesses are respectively formed in the inner and outer surfaces of the pad guide groove in the inner radial direction of the disc, Each of the retainers is formed with a protrusion that fits into the recess, and the ear piece is formed with a protrusion that is inserted inside the protrusion.

  In the present invention, the protrusion of the retainer and the recess of the pad guide groove are fitted to each other, so that the retainer can be prevented from dropping during the assembly operation. In addition, when the friction pad is mounted in the pad guide groove with the retainer attached, the protrusion of the retainer abuts the recess of the pad guide groove and the protrusion formed on the ear piece of the friction pad with almost no gap. There is no risk of rattling due to, for example.

  Further, since the braking torque generated by the braking operation performed when the vehicle moves forward or backward can be received even at the contact portion between the concave portion of the pad guide groove and the protrusion formed on the ear piece of the friction pad, it is conventionally set. It is possible to reduce the load on the torque receiving surface.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show a first embodiment in which the present invention is applied to a motorcycle disc brake. The disc brake 1 rotates integrally with a wheel (not shown) in the direction of arrow A when the vehicle travels forward. The disc rotor 2, the caliper bracket 3 fixed to the vehicle body on one side of the disc rotor 2, and the bracket 3 are supported by the bracket 3 so as to be movable in the disc rotor axial direction via a pair of slide pins 4 and 4. A pin slide type caliper body 5 and a pair of friction pads 6, 6 disposed opposite to both sides of the disk rotor 2.

  The caliper bracket 3 includes a plate-like portion 3a disposed along one side of the disc rotor 2, and a pad that protrudes toward the other side across the outer side of the disc rotor 2 on the disc delivery side of the caliper body 5. And a support arm 3b. A pair of pad guide grooves 3 c are provided on the caliper body 5 side of the pad support arm 3 b with the disc rotor 2 interposed therebetween. Each pad guide groove 3c is formed in a substantially U-shape that opens to the caliper body 5 side, and recesses 3d and 3d are provided on the inner and outer surfaces in the inner radial direction of the disk, and a retainer 7 is provided in each pad guide groove 3c. Is inserted.

  The retainer 7 is formed of a thin plate such as a stainless steel plate and has a guide portion 7a fitted into the pad guide groove 3c. The guide portion 7a is formed in a substantially U-shape that opens to the caliper body 5 side. Projections 7b and 7b are formed on the inner and outer surfaces in the radial direction of the inner disk so as to fit into the recesses 3d and 3d of the pad guide groove 3c, respectively.

  The caliper body 5 is connected to the action portion 5 a disposed on one side of the disk rotor 2 and the reaction portion 5 b disposed on the other side of the disk rotor 2 so as to straddle the outside of the disk rotor 2. And a bridge portion 5c. In the caliper body 5, one slide pin 4 on the caliper bracket 3 side is inserted into the pin hole 8 of the vehicle body mounting arm 5d formed on the caliper body 5, and the other slide pin 4 on the caliper body 5 side is inserted into the pad support arm 3b. The pin hole 9 is inserted and supported so as to be movable in the disk axial direction as described above.

  On the action part 5a and the reaction part 5b, hanger pin support arms 5e are provided at positions outside the outer peripheral surface of the disk rotor 2 so as to protrude from the disk rotor retraction side surface 5f of the bridge part 5c. A hanger pin 10 is installed in the disk axial direction across the outer periphery of the disk rotor 2 at 5e.

  The action portion 5a is provided with three cylinder holes 11, 11, and 11 that are open on the disk rotor 2 side, and the reaction portion 5b is provided with reaction force claws 5g that are spaced apart in the disk circumferential direction. Each cylinder hole 11 accommodates a cup-like piston 12 in a fluid-tight and movable manner, and the piston 12 is supplied to a hydraulic chamber 13 defined between the bottom of the cylinder hole 11. The cylinder hole 11 is moved toward the disc rotor 2 by the pressurized liquid.

  Each friction pad 6 includes a lining 14 that is in sliding contact with the side surface of the disk rotor 2, and a back plate 15 that is held by the caliper bracket 3 and the caliper body 5. The lining 14 has four blocks arranged in the circumferential direction of the disk. It has a configuration. The back plate 15 has a hanging portion 15a that protrudes from the inner side of the bridge portion 5c so as to bend toward the disc insertion side and the outer side in the radial direction of the disc, and an ear piece that also protrudes from the inner side of the bridge portion 5c to the disc outlet side. 15b, and two engaging protrusions 15c and 15c are provided on the outer peripheral side surface of the disk. The ear piece 15b is formed in a substantially rectangular shape that can be mounted in the pad guide groove 3c in which the retainer 7 is mounted, and projecting pieces 15d and 15d that can be inserted into the projecting portions 7b and 7b of the retainer 7 are provided on the distal end side. ing. A pad spring 16 is attached to the engaging protrusions 15c and 15c.

  In the disc brake 1 thus formed, the retainer 7 inserts the guide portion 7a into the pad guide groove 3c of the caliper bracket 3, and fits the protrusions 7b and 7b into the recesses 3d and 3d of the pad guide groove 3c. Attached. Since the retainer 7 fits both the protrusions 7b into the both recesses 3d of the pad guide groove 3c, the retainer 7 does not fall out of the pad guide groove 3c when the friction pad 6 is assembled.

  Each friction pad 6 inserts the above-mentioned hanger pin 10 at the tip of the suspension part 15a located outside the disk insertion side surface of the bridge part 5c. The ear piece 15b is inserted into the pad guide groove 3c to which the retainer 7 is attached, and the protrusion 15d is attached to the recess 3d of the pad guide groove 3c through the protrusion 7b of the retainer 7. Thereby, both friction pads 6 and 6 are suspended inside the bridge portion 5c so as to be movable in the disc axial direction with the disc rotor 2 sandwiched between the action portion 5a and the reaction portion 5b.

By attaching the friction pad 6 in this manner, the protrusion 7b of the retainer 7 abuts the recess 3d of the pad guide groove 3c and the protrusion 15d of the ear piece 15b without any substantial gap. There is no backlash. Further, when the brake operation is performed when the vehicle is reverse, the braking torque can be received even at the contact portion between the recess 3d of the pad guide groove 3c and the protrusion 15d of the ear piece 15b. The braking torque that has been reduced can be reduced, and the durability of the hanger pin 10 can be improved.
FIG. 3 shows a second embodiment in which the present invention is applied to a disc brake for an automatic four-wheel vehicle. The disc brake 20 is a disc that rotates integrally with a wheel (not shown) in the direction of arrow A when the vehicle travels forward. The rotor 21, a caliper bracket 22 fixed to the vehicle body on one side of the disk rotor 21, and a pair of caliper support arms 22a and 22a extending from the caliper bracket 22 to the outside of the disk rotor 21 in parallel in the disk axial direction. A pair of caliper bodies 24 that are supported so as to be movable in the axial direction of the disk rotor via slide pins 23, 23, and a pair of opposingly arranged discs 21 sandwiching the disk rotor 21 between the action part and the reaction part of the caliper body 24 The friction pads 25 and 25 are provided.

  The caliper support arms 22a and 22a are formed with pad guide grooves 22b and 22b provided opposite to each other with the caliper body 24 interposed therebetween. One pad guide groove 22b is formed on the caliper support arm 22a on the disk rotor retraction side. The other pad guide groove 22b is provided on the caliper support arm 22a on the disk delivery side with two disk rotors 21 therebetween. These pad guide grooves 22b are formed in a substantially U-shape opening toward the caliper body 24, and recesses 22c and 22c are formed on the inner and outer surfaces in the inner radial direction of the disk, and the pad guide grooves 22b have retainers. 26 is fitted.

  The retainer 26 includes guide portions 26a and 26a mounted in the pad guide grooves 22b and 22b, and each guide portion 26a is formed in a substantially U shape that opens to the caliper body 24 side, and the inner portion thereof. Protrusions 26b and 26b are formed on the inner and outer surfaces in the disk radial direction to fit into the recesses 22c and 22c of the pad guide groove 22b, respectively.

  Each friction pad 25 is formed by joining a lining 27 slidably in contact with the side surface of the disk rotor 21 to a metal back plate 28. The pieces 28a and 28a are projected. Each ear piece 28a is formed in a substantially rectangular shape that can be mounted in the pad guide groove 22b in which the retainer 26 is mounted, and projecting pieces 28b and 28b that can be inserted into the projecting portions 26b and 26b of the retainer 26 are provided on the distal end side. It has been.

  In the disc brake 20 thus formed, the retainer 26 inserts the guide portion 26a into the pad guide groove 22b of the caliper bracket 22, and the protrusions 26b and 26b of the guide portion 26a are connected to the recess 22c of the pad guide groove 22b. It is fitted to 22c and attached. Since each retainer 26 fits both protrusions 26b into both recesses 22c of the pad guide groove 22b, the retainer 26 does not fall out of the pad guide groove 22b when the friction pad 25 is assembled.

Each friction pad 25 accommodates both ear pieces 28a, 28a in pad guide grooves 22b, 22b fitted with retainers 26, 26, and each protruding piece 28b passes through each protrusion 26b of the retainer 26 to the pad guide groove. It mounts | wears with each recessed part 22c of 22b. Thereby, both friction pads 25 and 25 are suspended inside the bridge portion 24a so as to be movable in the disk axial direction with the disk rotor 21 sandwiched between the action portion and the reaction portion. By attaching the friction pad 25 in this manner, the protrusion 26b of the retainer 26 abuts the recess 22c of the pad guide groove 22b and the protrusion 28b of the ear piece 28a without any substantial gap. There is no backlash. Further, since the protrusions 28b of the friction pad 25 are engaged with the recesses 22c of the pad guide groove 22b, the friction pad 25 can be prevented from being dragged to the disk delivery side during braking, and a stable braking force can be secured. In addition, the braking torque generated by the braking operation performed when the vehicle moves forward or backward can also be received at the contact portion between the recess 22c of the pad guide groove 22b and the protruding piece 28b of the friction pad 25. The load on the torque receiving surface set in the pad guide groove 22b can be reduced.
The present invention is not limited to being applied to a pin slide type disc brake as in the above-described embodiment, but can also be applied to an opposing type disc brake having a pad guide groove in a caliper body. Further, the retainer may be any one having at least a retainer portion fitted in the pad guide groove, and any other shape may be used.

II sectional view of FIG. 2 showing a first embodiment of the present invention II-II sectional view of FIG. 1 showing a first embodiment of the present invention Sectional front view of a disc brake showing a second embodiment of the present invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,20 ... Disc brake, 2, 21 ... Disc rotor, 3, 22 ... Caliper bracket, 3c, 22b ... Pad guide groove, 3d, 22c ... Recess, 6, 25 ... Friction pad, 7, 26 ... Retainer, 7a, 26a ... guide portion, 7b, 26b ... projection, 14,27 ... lining, 15,28 ... back plate, 15b, 28a ... ear piece, 15d, 28b ... projection piece

Claims (1)

Ear pieces project from the back plates of a pair of friction pads arranged opposite to each other across the disk rotor, and the ear pieces are supported by a pad guide groove formed in either the caliper body or the caliper bracket via a retainer. In the vehicular disc brake that supports the friction pad so as to be movable in the disc axial direction, recesses are respectively formed in the inner and outer surfaces of the pad guide groove in the inner radial direction of the disc, and protrusions that fit into the recesses are formed in the retainer. A vehicular disc brake characterized in that a protrusion is formed on each of the ear pieces and is inserted into the protrusion.

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