JP2015148318A - Vehicle disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle disc brake provided with a pad retainer capable of reliably pulling back a friction pad when braking is released from a side surface of a disc rotor. A pad retainer 10 straddles a pair of retainer portions 10a, a connecting piece 10c that connects the retainer portions 10a and 10a across an outer edge of a disc rotor 2, and an ear piece 6b to bring the friction pad 6 into an anti-disc. And a pad return portion 10b for urging the rotor. The retainer portion 10a includes an outer piece 10d, a rear piece 10e, and an inner piece 10f, and the pad return portion 10b has an elongated piece 10m provided on the outer side in the radial direction of the disc with respect to the retainer portion 10a in the disc rotor direction. After extending, the elastic portion 10n formed by bending back in the inner side direction and in the direction opposite to the disk rotor, and formed at the tip of the elastic portion 10n, is brought into contact with the disk rotor side surface 6g of the ear piece 6b. Ear piece contact portion 10p. [Selection] Figure 1

Description

  The present invention relates to a vehicle disc brake used in vehicles such as automobiles and motorcycles, and more particularly, to a pad retainer that is disposed in a pad guide groove formed in a caliper support arm and supports an ear piece of a back plate of a friction pad. Concerning structure.

  Conventionally, a vehicle in which the ear pieces projecting on both sides of the back plate of the friction pad are supported by the pad guide groove formed on the caliper support arm of the caliper bracket so that the friction pad can be moved in the disk axis direction. In the disc brake for use, a pad retainer formed of a thin metal plate is interposed between the pad guide groove and the ear piece so as to prevent the generation of abnormal noise.

  As this pad retainer, there is one that integrally has a pad return portion that abuts against the ear piece, presses the ear piece against the disc rotor side when braking is released, and forcibly separates the friction pad from the side surface of the disc rotor. The pad return part is an elastic loop part obtained by bending an elongated piece extending in the direction opposite to the disk rotor from the back side piece of the retainer part mounted in the pad guide groove into an arc shape from the outside in the disk radial direction toward the disk rotor. And a return spring piece extending in the direction of the disk rotor from the bent return end of the elastic loop portion (see, for example, Patent Document 1).

JP 2000-9162 A

  However, in the above-mentioned Patent Document 1, the ear piece of the friction pad is attached to the pad guide groove in contact with the return spring piece, and the ear piece presses the return spring piece to the back side one side during braking. While moving in the pad guide groove, when releasing the brake, the elastic loop part and the return spring piece return to the initial shape, thereby pressing the ear piece against the disc rotor side and the friction pad on the side surface of the disc rotor. However, if foreign matter or the like is mixed between the return spring piece and the back side piece, the operability of the return spring piece may be affected.

  Accordingly, an object of the present invention is to provide a vehicle disc brake including a pad retainer that can reliably pull back the friction pad when the brake is released from the side surface of the disc rotor.

  In order to achieve the above object, a vehicle disc brake according to the present invention includes a caliper bracket fixed to a vehicle body, and a pair of caliper support arms extending across the outer edge of the disc rotor in the disc axial direction. The pad guide grooves are provided opposite to each other, and the ear pieces respectively protruding from both side portions of the back plate of the pair of friction pads arranged with the disk rotor interposed therebetween are supported by the pad guide grooves via the pad retainers. In the vehicle disc brake, the pad retainer includes a pair of retainer portions that are respectively attached to pad guide grooves on both sides of the disc rotor, and a connecting piece that connects the pair of retainer portions across the outer edge of the disc rotor. A pad returning portion that abuts against the ear piece and biases the friction pad toward the disc rotor side, Is an elastic part formed by extending the elongated piece provided on the outer side in the disk radial direction of the retainer part in the disk rotor direction, and then bending back in the disk radial direction inner side and in the anti-disk rotor direction; An ear piece abutting portion formed at the tip of the elastic portion and abutting against the disk rotor side surface of the ear piece is provided.

  Further, the pad guide groove is formed in a U-shape having a disk radial direction outer surface, a disk radial direction inner surface, and a facing surface connecting the disk radial direction outer surface and the disk radial direction inner surface, The retainer portion includes an outer piece disposed along a disk radial direction outer surface of the pad guide groove, a rear side piece disposed along the opposing surface, and a disk radial inner end portion of the rear piece. The pad return portion is preferably provided via a protruding piece protruding outward in the disk radial direction from the tip of the outer piece. Furthermore, it is preferable that the ear piece abutting portion is disposed on an orthogonal plane that is orthogonal to a disc radial line passing through the center of gravity of the friction pad and that passes through the center of gravity. Further, it is preferable that the pair of elastic portions facing each other with the disc rotor interposed therebetween are formed at positions shifted from each other in the disc rotation direction. In addition, it is preferable that the ear piece abutting portion has an indicator portion that protrudes toward the disc rotor side at the tip portion and that slides against the disc rotor when the friction pad is fully worn.

  According to the vehicle disc brake of the present invention, at the time of braking, the ear piece of the friction pad moves to the disc rotor side while deforming the pad return portion, and when the brake is released, the pad return portion returns to the initial shape. Then, the ear piece is pressed against the disc rotor side, and the friction pad is forcibly separated from the side surface of the disc rotor. At this time, since the ear piece of the friction pad does not slide on the pad return portion as in the prior art, the pad return portion can be operated reliably, and dragging of the friction pad can be prevented.

  In addition, since the pad return portion is provided via a protruding piece that protrudes outward in the disk radial direction from the tip portion of the outer piece, the pad return portion can be favorably formed. Furthermore, the ear piece contact portion formed at the tip of the elastic portion of the pad retainer is disposed on the orthogonal plane passing through the center of gravity of the friction pad and perpendicular to the disk radial direction line and passing through the center of gravity. At the time of release, the ear piece abutting portion can press the ear piece to the side opposite to the disk rotor, and the friction pad can be well separated from the side surface of the disk rotor. Moreover, by forming the pair of opposing elastic portions at positions shifted from each other in the disk rotation direction, the material can be efficiently taken from one plate material while ensuring the length of the elastic portion, Cost reduction can be achieved. Furthermore, since the ear piece contact portion is provided with an indicator portion at the tip, it can be provided with an indicator function for notifying the pad retainer of the wear state of the friction pad, and the number of parts can be reduced.

1 is a partially sectional rear view of a vehicle disc brake showing a first embodiment of the present invention. It is a principal part expanded sectional view of the disk brake for vehicles similarly. It is a perspective view of a pad return spring similarly. It is a top view of a pad return spring similarly. It is VV sectional drawing of FIG. It is explanatory drawing when a friction pad carries out full wear. 1 is a front view of a vehicle disc brake showing a first embodiment of the present invention. It is VIII-VIII sectional drawing of FIG. 1 is a plan view of a vehicle disc brake showing a first embodiment of the present invention. It is principal part sectional drawing of the disc brake for vehicles which shows the 2nd form example of this invention. It is a perspective view of a pad return spring similarly.

  FIG. 1 to FIG. 9 are views showing a first embodiment of the vehicle disc brake of the present invention. An arrow A indicates the rotation direction of the disc rotor that rotates integrally with the wheel when the vehicle moves forward. The side and the disk entry side shall be when the vehicle is moving forward.

  The vehicle disc brake 1 includes a caliper bracket 3 fixed to a vehicle body at one side of a disc rotor 2 that rotates integrally with a wheel, and a pair of slide pins on caliper support arms 3 a and 3 a of the caliper bracket 3. A caliper body 5 supported so as to be movable in the disk axial direction via 4 and 4 and a pair of friction pads 6 and 6 disposed to face each other with the disk rotor 2 interposed therebetween.

  The caliper body 5 includes an action part 5a and a reaction part 5b disposed on both sides of the disk rotor 2, and a bridge part 5c that connects these parts across the outer edge of the disk rotor 2, and the action part 5a includes A cylinder hole 5d having an opening on the disk rotor 2 side is provided. The cylinder hole 5d accommodates a bottomed cylindrical piston 7, and the piston 7 is supplied by a hydraulic pressure supplied to a hydraulic chamber 8 defined between the bottom side of the cylinder hole 5d and the piston 7. The cylinder hole 5d is moved toward the disk rotor. Further, vehicle body mounting arms 5e and 5e project from both sides of the acting portion 5a in the disk rotation direction, and the above-mentioned slide pins 4 are respectively attached to the tips of the vehicle body mounting arms 5e via mounting bolts 9. Projecting.

  The caliper support arms 3a and 3a straddle the outer edge of the disc rotor 2 in the disc axial direction while sandwiching both sides of the bridge portion 5c from both sides of the caliper bracket 3 in the disc rotation direction, and further react on the other side of the disc rotor 2. The shape extends along the side wall of the portion 5b toward the center of the disk. Further, the tip portions of the caliper support arms 3a and 3a are connected by a tie rod 3b to enhance the rigidity of both the caliper support arms 3a and 3a to which a braking torque is applied.

  Each caliper support arm 3a is provided with a guide hole 3c for receiving the above-described slide pin 4, and the four caliper support arms 3a and 3a are respectively opposed to each other at the respective sides of the disc rotor 2. Pad guide grooves 3d and 3d are provided. Each pad guide groove 3d is formed in a U-shape having a disk radial direction outer side surface 3e, a disk radial direction inner side surface 3f, and an opposing surface 3g connecting the both side surfaces 3e, 3f. Ear pieces 6b and 6b protruding from both sides of 6a are supported by pad guide grooves 3d and 3d on the disk insertion side and the extraction side via pad retainers 10, respectively.

  Each friction pad 6 has ear pieces 6b and 6b protruding from both sides of the back plate 6a, and a lining 6c is attached to one side of the back plate 6a. Each ear piece 6b is formed in a substantially rectangular shape that can be inserted into the pad guide grooves 3d and 3d, and includes an outer surface 6d in the radial direction of the disk, an inner surface 6e in the radial direction of the disk, and an outer end surface 6f on the outer side in the rotational direction of the disk. ing.

  The pad retainer 10 is formed by pressing a single plate material, and a pair of retainer portions 10a mounted on the pad guide grooves 3d, 3d on both sides of the disk rotor on the disk insertion side or the disk extraction side. 10a, pad return portions 10b, 10b provided on the disk radial direction outer side of the retainer portions 10a, 10a, and a connecting piece 10c connecting the pair of retainer portions 10a, 10a across the outer edge of the disk rotor 2. Yes.

  Each retainer portion 10a includes an outer piece 10d arranged along the disk radial direction outer surface 3e of the pad guide groove 3d, a rear piece 10e arranged along the opposing surface 3g, and a disk of the rear piece 10e. An inner piece 10f is provided so as to extend from the radially inner end of the rotor toward the outer side in the disk radial direction, and the outer piece 10d and the inner piece 10e are connected at right angles.

  Each of the inner pieces 10f protrudes from the base end side toward the tip end side in the disk axial direction center of the base end portion so as to incline toward the inside of the disk radial direction, and the inner surface 3f of the pad guide groove 3d in the disk radial direction. A tongue piece 10g with which the tip abuts is cut and raised. Further, an ear piece support portion 10h that is curved convexly toward the outer side in the disk radial direction and supports the inner surface 6e in the disk radial direction of the ear piece 6b is formed on the distal end side of the inner piece 10f. In addition, insertion guide pieces 10i are provided on the outer side of the outer piece 10d and the inner piece 10e on the opposite side of the disk rotor so that the ear pieces 6b of the friction pad 6 can be easily inserted. Further, a positioning piece 10j for positioning the pad retainer 10 in contact with the rotor groove 3h formed on the caliper support arm 3a is formed at the center of the connecting piece 10c.

  Each pad return portion 10b includes a protruding piece 10k protruding outward in the disk radial direction from the tip of the outer piece 10d, and an elongated piece 10m extending from the protruding piece 10k to the disk rotor side in the inner one direction, and An elastic portion 10n formed by bending back in an arc shape in the anti-disk rotor direction, and an ear piece abutting portion 10p formed at the tip of the elastic portion 10n and brought into contact with the disk rotor side surface 6g of the ear piece 6b. I have. The elastic portion 10n is set at a predetermined position separated from the disk rotor 2 so as not to contact the side surface of the disk rotor 2 during braking from when the friction pad 6 is new to when the lining 6c is fully worn. And bent back into an arc shape. Further, the tip end sides of the pair of elastic portions 10n, 10n facing each other with the disc rotor 2 interposed therebetween are formed at positions shifted from each other in the disc rotation direction, while ensuring the length of the elastic portions 10n, 10n. Good material can be removed from the plate material.

  Each ear piece abutting portion 10p is arranged on an orthogonal plane PL1 orthogonal to the disk radial direction line L1 passing through the center of gravity G1 of the friction pad 6 and passing through the center of gravity G1, and the tip of the ear piece abutting portion 10p. Is provided with an indicator portion 10q that protrudes toward the disk rotor 2 and comes into sliding contact with the side surface of the disk rotor 2 when the lining 6c of the friction pad 6 is fully worn.

  In the pad retainer 10 formed in this way, the outer piece 10d is brought into contact with the outer surface 3e in the disk radial direction of each pad guide groove 3d, and the base end portion of each inner piece 10f is placed in the disk of each pad guide groove 3d. Each retainer portion 10a is mounted in the pad guide groove 3d and positioned by the positioning piece 10j while being in contact with the inner side of the radially inner side surface 3f, and the elastic portion 10n of each pad return portion 10b is It arrange | positions toward the disk rotor 2 side from the protrusion piece 10k, respectively.

  In each friction pad 6, the ear pieces 6b, 6b of the back plate 6a are inserted into the pad guide grooves 3d, 3d on the disk insertion / retraction side, and the disk rotor side surfaces 6g, 6g of the ear pieces 6b, 6b are connected to the pad retainer 10. And abutting the inner side surfaces 6e, 6e of the ear pieces 6b, 6b with the ear piece support portions 10h, 10h of the inner pieces 10f, 10f, The disk is biased outward in the radial direction of the disk.

  This embodiment is formed as described above, and when the pressurized hydraulic fluid is supplied to the hydraulic pressure chamber 8 by the driver's braking operation, the piston 7 moves forward through the cylinder hole 5d, and the friction on the action portion 5a side The pad 6 is pressed against one side of the disk rotor 2. Next, by this reaction force, the caliper body 5 is moved in the direction of the action portion 5a while being guided by the slide pins 4 and 4, and the reaction force claw 5f provided on the reaction portion 5b becomes the friction pad 6 on the reaction portion 5b side. Is pressed against the other side of the disk rotor 2. At this time, the ear pieces 6b, 6b of the friction pad are smoothly moved in the pad guide grooves 3d, 3d while the outer surfaces 10d, 6d of the disk radial direction are guided by the outer pieces 10d, 10d of the retainer portions 10a, 10a. The disk rotor side surfaces 6g and 6g of the ear pieces 6b and 6b press the ear piece abutting portions 10p and 10p to the disc rotor 2 side while deforming the elastic portions 10n and 10n.

  On the other hand, when the brake is released and the piston 7 and the reaction force claw 5f retreat to the initial position, the elastic portions 10n and 10n attempt to return to the initial shape, and thus contact the ear piece contact portions 10p and 10p. The ear pieces 6b, 6b are pressed against the disc rotor side, and the friction pads 6 are forcibly separated from the side surfaces of the disc rotor 2. Thereby, dragging of each friction pad 6 can be prevented.

  Further, at the time of braking when the lining 6c of the friction pad 6 is fully worn, the elastic portions 10n and 10n are deformed as the ear pieces 6b and 6b move toward the disk rotor 2 as shown in FIG. While pressing, the ear piece abutting portions 10p, 10p are pressed toward the disk rotor 2, and the indicator portions 10q, 10q are in sliding contact with the side surface of the disk rotor 2, and the wear state of the linings 6c, 6c is notified by the sliding contact sound. it can. At this time, a slight gap is formed between the elastic portions 10n and 10n and the side surface of the disk rotor 2, and the elastic portions 10n and 10n are in sliding contact with the side surface of the disk rotor 2. Absent.

  As described above, according to the vehicle disc brake 1 of the present embodiment, the ear pieces 6b and 6b of the friction pad 6 slide on the pad return portions 10b and 10b during braking and when braking is released as in the related art. Therefore, the pad return portions 10b and 10b can be reliably operated, and the friction pad 6 can be reliably prevented from being dragged. Further, the pad return portion 10b can be satisfactorily formed because the pad return portion 10b is provided via the protruding piece 10k protruding outward from the distal end portion of the outer piece 10d in the radial direction of the disk. Further, by forming the pair of opposing elastic portions 10n and 10n at positions shifted from each other in the disk rotation direction, the material can be efficiently removed from one plate material while ensuring the length of the elastic portions 10n and 10n. The cost can be reduced. Further, the ear piece abutting portion 10p is disposed on the orthogonal plane PL1 perpendicular to the disk radial direction line L1 passing through the center of gravity G1 of the friction pad 6 and passing through the center of gravity G1, so that the ear piece abutment is provided at the time of braking release. The portion 10p can favorably press the ear piece 6b to the side opposite to the disk rotor, and the friction pad 6 can be well separated from the side surface of the disk rotor 2. Further, the ear piece abutting portion 10p can be provided with an indicator function for notifying the wear state of the friction pad 6 to the pad retainer 10 by forming the indicator portion 10q at the tip portion, thereby reducing the number of parts. Can be planned.

  FIGS. 10 to 11 show a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. .

  The elastic part 11a of the pad retainer 11 of the present embodiment includes a first inclined piece 11c in which an elongated piece 11b extending from the protruding piece 10k to the disk rotor side is gradually inclined toward the disk rotor side toward the inner side direction. A second inclined piece 11d that is gradually inclined toward the opposite disk rotor side from the front end portion of the first inclined piece 11c toward the inner side direction, and an ear piece abutting portion at the front end portion of the second inclined piece 11d. 11e and the indicator part 11f are formed.

  In addition, this invention is not restricted to each above-mentioned form example, The thing which does not provide the indicator part in the elastic part of a pad retainer may be used. Furthermore, you may form a pad return part directly on an outer side piece, without passing through a protrusion piece. Further, the shape of the connecting piece or mounting piece of the pad retainer and the shape of the insertion guide piece or positioning piece are arbitrary. Furthermore, when the friction pad lining is fully worn, the ear piece contact portion of the pad retainer is perpendicular to the disk radial direction line L1 passing through the center of gravity G1 of the friction pad and on the orthogonal plane PL1 passing through the center of gravity G1. It may be arranged.

DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Tie rod, 3c ... Guide hole, 3d ... Pad guide groove, 3e ... Disc radial direction outer surface, 3f ... Disc radius Direction inner surface, 3g ... opposing surface, 3h ... rotor groove, 4 ... slide pin, 5 ... caliper body, 5a ... action part, 5b ... reaction part, 5c ... bridge part, 5d ... cylinder hole, 5e ... body mounting arm, 5f ... Reaction force claw, 6 ... Friction pad, 6a ... Back plate, 6b ... Ear piece, 6c ... Lining, 6d ... Disc radial outer side, 6e ... Disc radial inner side, 6f ... Outer end surface, 6g ... Disc rotor Side surface, 7 ... piston, 8 ... hydraulic chamber, 9 ... mounting bolt, 10 ... pad retainer, 10a ... retainer part, 10b ... pad return part, 10c ... connecting piece, 10d ... outside Piece, 10e ... back side piece, 10f ... inner piece, 10g ... tongue piece part, 10h ... ear piece support part, 10i ... insertion guide piece, 10j ... positioning piece, 10k ... projecting piece, 10m ... elongated piece, 10n ... elastic Part, 10p ... ear piece contact part, 10q ... indicator part, 11 ... pad retainer, 11a ... elastic part, 11b ... elongated piece, 11c ... first inclined piece, 11d ... second inclined piece, 11e ... ear piece contact Part, 11f ... indicator part

Claims (5)

  A caliper bracket fixed to the vehicle body is extended with a pair of caliper support arms that straddle the outer edge of the disc rotor in the disc axial direction, and a pad guide groove is provided facing the caliper support arms, with the disc rotor interposed therebetween. In the disc brake for a vehicle, in which the ear pieces respectively projecting on both side portions of the back plate of the pair of friction pads are supported on the pad guide groove via the pad retainer, the pad retainer is disposed on both sides of the disc rotor. A pair of retainer portions respectively mounted in the pad guide grooves, a connecting piece straddling the outer edge of the disk rotor, connecting the pair of retainer portions, and abutting against the ear piece, the friction pad is placed on the side opposite to the disk rotor. A pad return portion that urges the retainer portion, and the pad return portion is provided on the outer side in the disk radial direction of the retainer portion. Is formed at the tip of the elastic portion, and is formed at the front end of the elastic portion. A disc brake for a vehicle, comprising an ear piece abutting portion that abuts on a side surface.   The pad guide groove is formed in a U-shape having a disk radial outer surface, a disk radial inner surface, and an opposing surface connecting the disk radial outer surface and the disk radial inner surface, and the retainer The portion includes an outer piece disposed along the outer surface in the disk radial direction of the pad guide groove, a rear piece disposed along the opposing surface, and an inner end in the disk radial direction of the inner piece. 2. An inner piece projecting in one direction opposite to the rear side, and the pad return portion is provided via a projecting piece projecting outward in the disk radial direction from the tip of the outer piece. Vehicle disc brakes.   3. The vehicle according to claim 1, wherein the ear piece contact portion is disposed on an orthogonal plane that passes through the center of gravity of the friction pad and that is perpendicular to a radial line of the disk that passes through the center of gravity. Disc brake.   The vehicular disc brake according to any one of claims 1 to 3, wherein the pair of elastic portions facing each other with the disc rotor interposed therebetween are formed at positions shifted from each other in the disc rotation direction.   2. The ear piece abutting portion is formed at an end portion thereof to project toward the disc rotor side, and an indicator portion is formed that slides on the disc rotor when the friction pad is fully worn. 5. The vehicle disc brake according to any one of claims 1 to 4.

Images