JP5213818B2 - Vehicle disc brake - Google Patents

Description

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

  Conventionally, the ear pieces projecting on both sides of the back plate of the friction pad are supported by a pad guide groove formed opposite to a pair of caliper support arms to support the friction pad so as to be movable in the disk axis direction. In general, in a disc brake, a pad retainer formed of a thin metal plate is interposed between a pad guide groove and an ear piece. Some of these pad retainers include a resilient portion that urges the outer surface of the pad guide groove in the radial direction of the disk, and this resilient portion may suppress the backlash of the friction pad (for example, (See Patent Document 1).

JP 2006-46597 A

  In the above-mentioned Patent Document 1, the pad retainer can reduce the sliding resistance and backlash of the friction pad ear piece, and in the vibration generated during normal running, the friction pad ear piece is reduced. The pad retainer can be stably held at a predetermined position by the urging force of the elastic portion of the pad retainer. However, for example, when a vibration greater than normal occurs in the vehicle body, such as when climbing over a step during driving, there is a gap between the elastic part of the pad retainer and the inner surface of the pad guide groove in the disk radial direction. The friction pad temporarily moves inward in the radial direction of the disk against the urging force of the pad retainer, and then is urged outward in the radial direction of the disk by the urging force of the pad retainer, and the ear piece is padded through the pad retainer. The guide groove sometimes collided with the outer surface of the disk in the radial direction of the disk or the inner surface of the disk in the radial direction of the disk, and a cronk sound (collision sound) sometimes occurred.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle disc brake that can prevent rattling of a friction pad by a pad retainer and can prevent the generation of a crank sound.

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. A U-shaped pad guide groove having an outer surface in the radial direction of the disk, an inner surface in the radial direction of the disk, and an opposing surface connecting the both side surfaces is provided to face the back of the friction pad disposed with the disk rotor interposed therebetween. Ear pieces projecting from both sides of the plate are supported by the pad guide grooves via pad retainers, respectively, and the pad retainers are attached to the pad guide grooves on both sides of the disk rotor, and the retainers A pair of pad projecting pieces that urge the friction pads outward in the radial direction of the disk, and straddle the outer edge of the disk rotor. A vehicle disc brake comprising a connecting piece for connecting the retainer portion, the disc radially outwardly of the pad guide groove, provided the pad retainer mounting portion having a mounting surface in a direction parallel to the disk radially outer surface, said retainer The portion includes an outer piece disposed along the outer surface of the pad guide groove in the radial direction of the disk, a rear piece disposed along the opposing surface of the pad guide groove, and an inner side of the rear piece in the radial direction of the disk. A pad elastic piece extending gradually from the end toward the outer side in the radial direction of the disk, and the outer side of the outer piece has a groove rear side outside the groove opening side of the outer piece. to form a stepped portion bent stepwise to be positioned, the pad spring-piece, abuts the inner disc radially protrudes, in the disc radially inner surface of the pad guide groove Projection is formed that, with the pad retainer, the disk radially outer groove inner side of Mizooku side of the outer piece abuts against the side face abutment portion and the groove-opening-side contact portion of the groove open side, The pad retainer mounting portion is clamped at three positions, that is, the mounting piece side contact portion of the mounting piece that contacts the mounting surface between the groove back side contact portion and the groove opening side contact portion in the disk circumferential direction. The pad bullet piece protrudes from the pad guide groove along a radially inner side surface of the pad guide groove, and the protrusion is a disk of the pad bullet piece. It may be a rib in a direction parallel to the axis, or may be at least one protrusion.

  According to the vehicle disc brake of the present invention, the gap between the pad projecting piece and the inner side surface in the disc radial direction of the pad guide groove is reduced by the protrusion projecting inward in the disc radial direction provided on the pad projecting piece. In addition, since it can be eliminated, the friction pad hardly oscillates in the radial direction of the disc even if vibration larger than usual occurs in the vehicle body, and the generation of the cronk noise can be suppressed. Moreover, since the protrusion is formed by a rib extending in a direction parallel to the disk axis of the pad bullet piece or at least one hemispherical protrusion, the protrusion can be formed with a simple configuration.

It is a principal part expanded sectional view of the disc brake which shows the 1st form example of this invention. It is explanatory drawing of the state which similarly attached the pad retainer to the pad guide groove. It is a perspective view of a pad retainer similarly. It is a partial cross-section rear view of the disc brake. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG. It is a front view of a disk brake similarly. It is a perspective view of the pad retainer which shows the 2nd example of the present invention.

  FIGS. 1 to 7 are views showing one embodiment of a vehicle disc brake according to the present invention. An arrow A indicates a rotation direction of a disc rotor that rotates integrally with a front wheel when the vehicle moves forward. The disk entry side is when the vehicle is moving forward.

  The disc brake 1 for a vehicle includes a disc rotor 2 that rotates integrally with a wheel, a caliper bracket 3 that is fixed to a vehicle body at one side of the disc rotor 2, and caliper support arms 3 a and 3 a of the caliper bracket 3. The caliper body 5 supported so as to be movable in the disk axial direction via a pair of slide pins 4 and 4 and the action portion 5a and the reaction portion 5b of the caliper body 5 are opposed to each other with the disc rotor 2 interposed therebetween. It consists of a pair of friction pads 6 and 6 arranged.

  The caliper body 5 includes the above-described action part 5a and 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. Is provided with a cylinder hole 7 having an opening on the disk rotor 2 side. The cylinder hole 7 accommodates a cylindrical piston 8 with a bottom, and the piston 8 moves in the dis-axis direction through the cylinder hole 7 by the pressurized liquid supplied to the hydraulic chamber 9 at the bottom of the cylinder hole. ing. Further, vehicle body mounting arms 5d and 5d project from the side of the action portion 5a, and the above-described slide pins 4 project from the front ends of the vehicle body mounting arms 5d by mounting bolts. Yes.

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

  Each caliper support arm 3a is provided with a guide hole 3c for accommodating the slide pin 4 described above, and the four caliper support arms 3a and 3a have four pads facing each other on the respective side portions of the disc rotor 2. A guide groove 3d is 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 both side surfaces 3e, 3f, and each friction pad 6 has a back plate 6a. The ear pieces 6b and 6b projecting on both sides of the disc are respectively supported by the pad guide grooves 3d and 3d on the disk insertion side and the extraction side via the pad retainer 10, respectively. Further, pad retainer mounting portions 3i and 3i having mounting surfaces 3h parallel to the disk radial direction outer side surface 3e are provided outside the pad guide grooves 3d and 3d in the disk radial direction, respectively.

  The pad retainer 10 has a pair of retainer portions 10a, 10a mounted on the pad guide grooves 3d, 3d on both sides of the disc rotor and a pad retainer mounting portion 3i of the caliper support arm 3a on the disc entrance side or the disc exit side. , 3i and the connecting pieces 10b, 10b that contact the mounting surface 3h, and the connecting piece 10c that straddles the outer edge of the disk rotor 2 and connects the upper portions of the mounting pieces 10b, 10b. Each retainer portion 10a includes an outer piece 10d that comes into contact with the outer surface 3e in the disk radial direction of the pad guide groove 3d, a rear piece 10e that comes into contact with the opposing surface 3g of the pad guide groove 3d, and a disk radius of the rear piece 10e. A pad elastic piece 10f that is gradually inclined from the inner end in the direction toward the outer side in the radial direction of the disk, and the outer piece 10d and the rear piece 10e are connected at a right angle.

  The pad elastic piece 10f has a rib 10g in the direction parallel to the disk axis that protrudes inward in the radial direction of the disk on the base end side and can abut on the inner surface 3f in the radial direction of the pad guide groove 3d. Further, an ear piece abutting portion 10h that abuts on the ear piece 6b is formed, and the ear piece abutting portion 10h is formed so as to protrude to the side opposite to the disk rotor.

  Each outer piece 10d is bent in a step shape so that the groove rear side portion 10i of the outer piece 10d is disposed on the outer side in the disk radial direction with respect to the groove opening side portion 10k of the outer piece 10d. Is formed. Further, the front end of the groove opening side portion 10k of the outer piece 10d is bent back along the front end surface of the pad retainer mounting portion 3i and extended toward the outer surface in the disk radial direction of the pad retainer mounting portion 3i. The pad retainer mounting portion 3i is sandwiched between the mounting piece 10b and the outer strip 10d that are elastically deformed outward. In addition, insertion guide pieces 10n are provided on the outer side of the outer pieces 10d and 10d and the inner pieces 10e and 10e on the opposite side of the disc rotor so that the ear pieces 6b of the friction pads 6 can be easily inserted. ing. Further, positioning pieces 10o for positioning the pad retainer 10 with respect to the caliper bracket 3 are provided on the disk rotor side of the back side pieces 10e, 10e, respectively.

  As shown in FIG. 2, the pad retainer 10 formed in this manner is attached to the caliper support arm 3a by inserting the attachment piece 10b and the outer piece 10d into the pad retainer attachment portion 3i. With this attachment, the outer piece 10d of each retainer portion 10a is mounted in contact with the disk radial outer surface 3e of each pad guide groove 3d, and the pad elastic piece 10f gradually moves toward the outer side in the disk radial direction. Each is arranged in a state of being inclined while being curved. Further, since the step portion 10m formed on the outer piece 10d forms a gap between the groove opening side portion 10k of the outer piece 10d and the disk radial outer surface 3e of the pad guide groove 3d, the mounting piece 10b Due to the elastic restoring force, a force toward the outer side in the disk radial direction is applied to the groove opening side part 10k of the outer piece 10d, and the groove inner side contact part A1 and the groove opening of the groove inner side part 10i contacting the disk radial direction outer surface 3e. The mounting piece side of the mounting piece 10b that contacts the mounting surface 3h between the groove opening side contact portion A2 of the side portion 10k and the groove back side contact portion A1 and the groove opening side contact portion A2 in the disk circumferential direction. The pad retainer mounting portion 3i is clamped at three locations with the contact portion A3, and when this force acts on the back side piece 10e, the inner side in the disk radial direction of the back side piece 10e is directed toward the center of the friction pad 6. For It is disposed on the inclined state Te.

  Each friction pad 6 has ear pieces 6b, 6b of the back plate 6a inserted into the pad guide grooves 3d, 3d on the disk insertion / retraction side via the retainer portions 10a, 10a of the pad retainer 10, respectively. The outer radial surfaces of the discs 6b and 6b are brought into contact with the outer pieces 10d and 10d of the retainers 10a and 10a, and the inner surfaces of the ear pieces 6b and 6b in the disc radial direction are contacted with the ear pieces of the pad elastic pieces 10f and 10f. It is attached in contact with the contact portions 10h and 10h, respectively. Thereby, as shown in FIG. 1, the pad bullet pieces 10f and 10f are in a state where the ribs 10g and 10g are in contact with the inner surfaces 3f and 3f in the disk radial direction of the pad guide grooves 3d and 3d, or slightly As a result, a gap is formed. Further, the back side pieces 10e, 10e arranged with the inner side in the disk radial direction inclined toward the center direction of the friction pad 6 are pressed by the ear pieces 6b, 6b and elastically deformed to the facing surface 3g side.

  This embodiment is formed as described above, and when the pressurized hydraulic fluid is supplied to the hydraulic pressure chamber 9 by the driver's braking operation, the piston 8 moves forward through the cylinder hole 7 to act on the action portion 5a side. The friction pad 6 is pressed against one side of the disk rotor 2 rotating in the direction of arrow A. Next, the caliper body 5 is moved in the direction of the action portion 5a by this reaction force while being guided by the slide pins 4 and 4, and the reaction force claw 5e moves the lining 6c of the friction pad 6 on the reaction portion 5b side to the disc rotor 2. Press to the other side.

  At this time, the ear pieces 6b, 6b of each friction pad 6 are pressed by the pad elastic pieces 10f, 10f on the inner side in the disk radial direction toward the outer side 3e, 3e in the disk radial direction of the pad guide grooves 3d, 3d. In this state, the disk radial direction outer surface is smoothly moved in the pad guide grooves 3d and 3d while being guided by the outer pieces 10d and 10d of the retainer portions 10a and 10a.

  In this way, the outer side surfaces of the ear pieces 6b, 6b in the disk radial direction are always pressed against the outer side surfaces 3e, 3e of the pad guide grooves 3d, 3d via the outer pieces 10d, 10d. , 6b does not rattle in the pad guide grooves 3d, 3d, so that the hitting sound of the friction pad 6 due to the rattling can be suppressed, and the brake noise can be effectively suppressed.

  Further, when vibration greater than normal occurs in the vehicle body, such as when overcoming a step during traveling, each friction pad 6 temporarily resists the urging force of the pad bullet pieces 10f, 10f in the disk radial direction. Move inward. At this time, since the ribs 10g and 10g of the pad bullet pieces 10f and 10f are in contact with the inner surfaces 3f and 3f in the radial direction of the disk or a minute gap is formed, Since the pieces 10f and 10f and the inner surface 3f and 3f in the radial direction of the disk do not come into contact with each other, the impact caused by the collision of the friction pad 6 is attenuated by the ribs 10g and 10g, thereby preventing the generation of cronk noise. Next, the friction pad is urged radially outward by the urging force of the pad elastic pieces 10f, 10f, and the ear pieces 6b, 6b are passed through the outer pieces 10d, 10d of the pad retainer 10 to the pad guide grooves 3d, 3d attempts to collide with the outer surface 3e, 3e of the disk radial direction, but the step portions 10m, 10m provided on the outer pieces 10d, 10d cause the groove back side contact portion A1 and the groove opening side contact portion A2 to contact each other. Since a gap is formed between them, the outer piece 10d is elastically deformed, and the force in the collision direction of the ear pieces 6b and 6b is absorbed, thereby preventing the generation of a cronk sound.

  FIG. 8 shows 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 pad retainer 11 according to the present embodiment protrudes inward in the radial direction of the disk on the pad elastic piece 10f instead of the rib 10g according to the first embodiment, and can contact the inner surface 3f in the radial direction of the disk of the pad guide groove 3d. Three hemispherical projections 10p are arranged in parallel in the direction parallel to the disk axis.

  The present invention is not limited to the above-described embodiments, and the shape of the connecting piece and the mounting piece formed on the pad retainer, the shape and forming position of the insertion guide piece are arbitrary, and the stepped portion is formed on the outer piece. There is no problem even if it is not formed.

  Furthermore, as in the second embodiment, in the case where the protrusion is provided on the pad bullet piece, the number of protrusions may be one or more, and it is preferable to provide three or more protrusions. Further, the shape of the protrusion is not limited to a hemispherical shape, and is arbitrary.

  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 Directional inner surface, 3g ... opposing surface, 3h ... mounting surface, 3i ... pad retainer mounting portion, 4 ... slide pin, 5 ... caliper body, 5a ... action portion, 5b ... reaction portion, 5c ... bridge portion, 5d ... body attachment Arms, 5e ... reaction force claws, 6 ... friction pads, 6a ... back plate, 6b ... ear pieces, 6c ... linings, 7 ... cylinder holes, 8 ... pistons, 9 ... hydraulic chambers, 10 ... pad retainers, 10a ... retainers Part, 10b ... mounting piece, 10c ... coupling piece, 10d ... outer piece, 10e ... back piece, 10f ... pad impact piece, 10g ... rib, 10h ... ear piece contact part, 10i ... groove back side part, 0k ... groove open side, 10 m ... stepped portion, 10n ... insertion guide piece, 10o ... positioning piece, 10p ... projection, 11 ... pad retainer

Claims (4)

A pair of caliper support arms that straddle the outer edge of the disk rotor in the disk axial direction is extended to a caliper bracket that is fixed to the vehicle body. The caliper support arms include a disk radial outer surface, a disk radial inner surface, and both U-shaped pad guide grooves having opposing surfaces connecting the surfaces are provided to face each other, and ear pieces respectively protruding from both side portions of the back plate of the friction pad arranged with the disc rotor interposed therebetween are interposed via pad retainers. The pad retainers are respectively supported in the pad guide grooves, and the pad retainers are formed in a pair of retainer portions to be mounted in the pad guide grooves on both sides of the disk rotor, and urge the friction pads outward in the disk radial direction. A vehicle disk brake comprising: a pad bullet piece to be connected; and a connecting piece connecting the pair of retainer portions across the outer edge of the disk rotor Stomach,
A pad retainer mounting portion having a mounting surface in a direction parallel to the outer surface in the disk radial direction is provided on the outer side in the disk radial direction of the pad guide groove,
The retainer portion includes an outer piece disposed along a disk radial direction outer surface of the pad guide groove, a rear piece disposed along a facing surface of the pad guide groove, and a disk radius of the rear piece. A pad bullet piece extending from the inner end portion in the direction toward the outer side in the radial direction of the disk and gradually inclined.
In the outer piece, forming a step portion bent in a step shape so that the groove back side portion is disposed on the outer side in the disk radial direction than the groove opening side portion of the outer piece,
The pad projecting piece protrudes inward in the radial direction of the disk and forms a protrusion that contacts the inner surface of the pad guide groove in the radial direction of the disk,
The pad retainer includes a groove back side contact portion on the groove back side portion and a groove opening side contact portion on the groove opening side portion of the outer piece that contacts the disk radial direction outer surface, and the groove back side in the disk circumferential direction. The pad retainer mounting portion is clamped at three positions of the mounting piece side contact portion of the mounting piece that contacts the mounting surface between the side contact portion and the groove opening side contact portion . Disc brake. 2. The disc brake for a vehicle according to claim 1, wherein the pad bullet piece protrudes from the pad guide groove along a radially inner side surface of the pad guide groove. 3. The vehicle disc brake according to claim 1, wherein the protrusion is a rib in a direction parallel to the disc axis of the pad bullet piece. The vehicle disc brake according to claim 1, wherein the protrusion is at least one protrusion.

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