JP2007085439A - Disc brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent each engaging ratchet from being damaged by preventing an outer shim plate from being shifted at the time of braking as much as possible with a simple structure, and also by preventing an inner shim plate from getting into contact with an engagement piece of the outer shim plate and a position restricting projection of a back plate in the braking. <P>SOLUTION: The inner shim plate 8 and the outer shim plate 9 are placed to overlap each other and attached to the back surface of a back plate 6b. A stopper piece 9c extending to the vicinity of the torque transmission surface of the back plate 6b is formed on both sides of the disc of the outer shim plate 9 in the circumferential direction. While the back plate 6b, the inner shim plate 8, and the outer shim plate 9 are disposed to overlap one another and attached to a caliper body, the clearance L1 between the stopper piece 9c and a torque receiver 3h is formed smaller than the sum of the clearance L2 between an engagement piece 9e of the adjoining outer shim plate 9 and an engagement piece 8e of the inner shim plate 8, and the clearance L3 between the adjoining position restricting projection 6g and the engagement piece 8e of the inner shim plate 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disc brake mounted on a vehicle such as an automobile or a motorcycle, and more particularly to an assembly structure of a friction pad, an outer shim plate, and an inner shim plate used in the disc brake.

A caliper support arm of a caliper bracket is formed by connecting a caliper body in which a working portion disposed on one side of a disc rotor and a reaction portion disposed on the other side are integrally connected by a bridge portion straddling the outside of the disc rotor. In a disc brake in which a pair of friction pads are opposed to each other with a disc rotor sandwiched between the action portion and the reaction portion, the friction pads are dragged to the disc delivery side during braking. In order to prevent brake squealing, there is one in which two shim plates are mounted on the back surface of the friction pad back plate. These two shim plates are composed of an inner shim plate coated with an elastic material and disposed on the back plate side, and a metal outer shim plate covering the inner shim plate and the back plate. The shim plate and the outer shim plate are each formed with a locking piece that engages with the back plate, and the back plate is provided with a position restricting projection that prevents displacement of the inner shim plate and the outer shim plate. (For example, refer to Patent Document 1).
No. 7-751

  However, in the above-described case, the position of the friction pad, the inner shim plate, and the outer shim plate is shifted in the circumferential direction of the disk by repeated use over many years, and the locking pieces of the inner shim plate and the outer shim plate come into contact with each other. There was a case. In this state, when the brake is suddenly applied, if the friction pad is dragged strongly to the disk rotor delivery side by sliding contact with the disk rotor, a large force acts on the contact portion of the engaging claw, and the engagement There was a risk of damage to the nail.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle disc brake that has a simple structure so that the inner shim plate and the locking piece of the outer shim plate do not come into contact with each other and can prevent damage to the engaging claws. Yes.

  In order to achieve the above object, a first aspect of the present invention is a bridge portion straddling the outside of a disk rotor between an action portion arranged on one side portion of the disk rotor and a reaction portion arranged on the other side portion of the disk rotor. The caliper body that is integrally connected to the vehicle body is slidably supported by a pair of caliper support arms that straddle the outer periphery of the disc rotor in the disc axial direction of the caliper bracket that is fixed to the vehicle body, and between the action portion and the reaction portion. A pair of friction pads are arranged opposite to each other with the disk rotor interposed therebetween, and an outer shim plate and an inner shim plate are arranged on the back surface of the back plate of the friction pad, and the outer shim plate and the inner shim plate A locking piece is formed on each of the inner and outer circumferential sides of the disk, and the locking piece of the outer shim plate and the locking piece of the inner shim plate on one side are adjacent to each other and engaged with the back plate. On the back plate In the vehicle disc brake comprising: a torque transmission surface that transmits a braking torque by contacting the torque receiving portion of the caliper support arm during braking; and a position restricting protrusion that prevents the inner shim plate from being displaced. The outer shim plate has stopper pieces extending to the vicinity of the torque transmission surface of the back plate on both sides in the circumferential direction of the disk, and a friction pad with the inner shim plate and the outer shim plate attached to the back plate is attached to the caliper bracket. In this state, the separation distance between the stopper piece and the torque receiving portion is the separation distance between the engagement piece of the adjacent outer shim plate and the engagement piece of the inner shim plate, the adjacent position restricting protrusion, and the inner shim. It is characterized by being smaller than the sum of the separation distances between the plate and the locking piece.

  According to a second aspect of the invention, the locking piece of the outer shim plate and the locking piece of the inner shim plate on the other side are adjacent to each other and engaged with the back plate, respectively, and the inner shim plate and the outer shim are connected to the back plate. With the friction pad mounted with the plate attached to the caliper bracket, the distance between the stopper piece and the torque receiving portion is determined by the engagement piece of the outer shim plate on the other side and the engagement piece of the inner shim plate. It is characterized by being smaller than the separation distance.

  By configuring the present invention as described above, according to the first aspect of the present invention, even if the positions of the friction pad, the inner shim plate, and the outer shim plate are shifted in the disk circumferential direction during braking, the outer shim plate The stopper piece formed on the outer side shim plate is not displaced by a predetermined amount or more by contacting the torque receiving portion of the caliper bracket, and the stopper piece of the outer shim plate and the inner shim plate is the above-mentioned stopper piece. In this way, when the contact is made with the caliper bracket, the engagement claws can be prevented from being damaged because they are formed at positions where they do not contact each other.

  In the second invention, each shim plate can be reliably locked by the back plate while preventing damage to each locking piece.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is an enlarged explanatory view of a main part of a disc brake showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of a friction pad, an inner shim plate, and an outer shim plate, FIG. 3 is a front view of the disc brake, and FIG. FIG. 5 is a partial cross-sectional rear view of the disc brake, and FIG. 6 is a partial cross-sectional plan view of the disc brake. An arrow A in the figure indicates the rotational direction of the disc rotor during forward traveling of the vehicle, and the disc brake turn-in side and the outlet side used in the following description are for forward travel of the vehicle.

  The disc brake 1 includes a caliper bracket 3 attached to the vehicle body on one side of the disc rotor 2, a caliper body 5 supported by the caliper bracket 3 so as to be movable in the disc axial direction via slide pins 4 and 4, A pair of friction pads 6, 6 disposed opposite to each other with the disk rotor 2 interposed between the action part 5 a and the reaction part 5 b of the caliper body 5 are provided.

  The caliper bracket 3 includes a vehicle body fixing portion 3a disposed on one side surface portion of the disk rotor 2, and a pair of members extending from both ends of the vehicle body fixing portion 3a and straddling the outer periphery of the disk rotor 2 in the disk axial direction. The caliper support arms 3b and 3b each have a pair of friction pad holding portions 3c on the vehicle body fixing portion side, and straddle the outer side of the disc rotor 2 from the tip end portions of the friction pad holding portions 3c. And a pair of caliper support portions 3d protruding in the disk rotor axial direction. Fastening bolt mounting portions 3e for screwing connection bolts for mounting the vehicle body are provided at both end portions of the vehicle body fixing portion 3a. Each friction pad holding portion 3c has a U-shaped pad guide groove 3f formed in the disk axial direction, and each caliper support portion 3d has a bag-like pin insertion hole 3g through which the slide pin 4 is inserted. Each opening is provided on the action part side. In addition, a torque receiving portion 3h that receives the braking torque when the friction pad 6 abuts at the time of braking is formed on the caliper support portion 3d on the inner circumferential side of the disk from the pad guide groove 3f.

  The caliper body 5 includes the above-described action portions 5 a and reaction portions 5 b that are disposed opposite to both sides of the disk rotor 2 and a bridge portion 5 c that connects the outer sides of the disk rotor 2. Car body mounting arms 5d and 5d are projected along one side surface of the disk rotor 2 on the disk rotor turn-in side and the turn-out side of the action portion 5a. 4 protrudes in parallel with the disk axis.

  Both slide pins 4 are respectively inserted into pin insertion holes 3g of the caliper support arm 3b, and the caliper body 5 is disposed so as to be movable in the disc rotor axial direction via these slide pins 4 and 4. A cup-shaped piston 7 is inserted in the cylinder hole 5e formed in the action part 5a, and a reaction force claw 5f is provided in the reaction part 5b on the opposite side. The friction pads 6 and 6 are provided between 5f.

  Each friction pad 6 is formed by joining a lining 6a that is in sliding contact with the disk rotor 2 and a back plate 6b that is held by the caliper bracket 3. A back surface of the back plate 6b is used to prevent brake noise during braking. Two shim plates, an inner shim plate 8 coated with an elastic material and an outer shim plate 9 formed of a thin metal plate, are assembled. The back plate 6b, the inner shim plate 8, and the outer shim plate 9 are , And are formed in line-symmetric shapes with respect to the pad center line CL in the disk radial direction.

  The back plate 6b is provided with ear pieces 6c, 6c protruding on both sides, and by inserting the ear pieces 6c, 6c into the pad guide grooves 3f, 3f of the caliper bracket 3, the friction pad 6 is moved in the disk axial direction. It can be slidably attached to. In addition, torque transmission surfaces 6d and 6d that contact the torque receiving portions 3h and 3h at the time of braking and transmit the braking torque are formed on the inner peripheral side of the ear pieces 6c and 6c. The disc outer peripheral side surface 6e of the back plate 6b is formed by a curved surface substantially along the outer periphery of the disc rotor 2, and the inner shim plate 8 is misaligned at the central portion of the disc inner peripheral side surface 6f formed substantially linearly. Position restricting projections 6g are provided to prevent the above.

  The inner shim plate 8 attached to the friction pad 6 on the reaction portion side is formed by coating an elastic material on both sides of the back plate of the plate body, and along the disc outer peripheral side surface 6e and the disc inner peripheral side surface 6f of the back plate 6b. The projections 8c and 8c have a curved outer edge 8a and a linear inner edge 8b, and are arranged on the inner side of the torque transmission surfaces 6d and 6d of the back plate 6b. Upper locking pieces 8d and 8d are provided at a substantially central portion of the outer edge 8a with a predetermined interval, and lower locking pieces 8e and 8e are provided with a predetermined interval at both ends of the inner edge 8b in the circumferential direction of the disk. When the inner shim plate 8 is mounted on the back surface of the back plate 6b, the lower locking pieces 8e and 8e are disposed on both sides of the position restricting projection 6g of the back plate 6b. .

  The outer shim plate 9 has a curved outer edge 9a and a linear inner edge 9b along the disk outer peripheral side surface 6e and the disk inner peripheral side surface 6f of the back plate 6b. The stopper pieces 9c, 9c extending to the vicinity of the torque transmission surfaces 6d, 6d are extended, and the entirety is formed in substantially the same shape as the back surface shape of the back plate 6b. Upper locking pieces 9d, 9d, 9d are formed at the center of the outer edge and both ends in the disk circumferential direction, and lower locking pieces 9e, 9e are formed at both ends in the disk circumferential direction of the inner edge 9b, respectively. The outer shim plate 9 is mounted on the back surface of the back plate on which the inner shim plate 8 is mounted so as to cover the inner shim plate 8, and the central upper locking piece 9 d is between the upper locking pieces 8 d and 8 d of the inner shim plate 8. The lower locking pieces 9e, 9e on both sides are engaged with the lower locking pieces 8e, 8e of the inner shim plate 8 adjacent to the outer sides in the disk circumferential direction.

  The positions where the position restricting protrusion 6g of the back plate 6b, the upper locking pieces 8d and 8d and the lower locking pieces 8e and 8e of the inner shim plate 8, and the lower locking pieces 9e and 9e of the outer shim plate 9 are formed. The inner shim plate 8 and the outer shim plate 9 are overlapped and mounted on the back surface of the back plate 6b, and the center line of the back plate 6b, the inner shim plate 8 and the outer shim plate 9 in the radial direction of the disk and the center of the pad As shown in FIG. 1, the distance L1 between the stopper piece 9c of the outer shim plate 9 and the torque receiving portion 3h of the caliper bracket 3 is set to be equal to the outer shim plate 9 in a line-symmetric state where the position with the line CL is aligned. The distance L2 between the lower locking piece 9e and the lower locking piece 8e of the inner shim plate 8 adjacent to the lower locking piece 9e, the position restricting projection 6g of the back plate 6b, and the lower locking piece 8e of the inner shim plate 8 It is set to be smaller than the sum of the separation distances L3. Further, the distance L1 between the stopper piece 9c of the outer shim plate 9 and the torque receiving portion 3h of the caliper bracket 3 is such that the upper locking piece 9d of the outer shim plate 9 and the upper locking piece of the inner shim plate 8 adjacent thereto. It is set to be smaller than the separation distance L4 of 8d.

  Further, the inner shim plate 8 and the outer shim plate 9 attached to the friction pad 6 on the working portion side are formed to be smaller than the back surface shape of the back plate 6b as a whole and are used as a conventional inner shim plate and the outer side. A shim plate 9 is used.

  The present embodiment is configured as described above, and when a brake operation is performed, the piston 7 is pushed out from the cylinder hole 5e toward the disk rotor, and the friction pad 6 on the working portion side moves toward the disk rotor. 6 is brought into sliding contact with one side surface of the disk rotor 2. Due to this reaction, the caliper body 5 slides in the direction of the action part while being guided by the slide pin 4, and the reaction force claw 5f of the reaction part 5b moves the friction pad 6 on the reaction part side in the direction of the disk rotor. The lining 6a of No. 6 is brought into sliding contact with the other side of the disk rotor 2 to perform a braking action.

  At this time, in the brake operation when the vehicle moves forward, the friction pad 6 is dragged to the disk rotor delivery side in the direction of arrow A by sliding contact with the disk rotor 2, and the torque receiving portion 3h on the delivery side and the torque transmission surface 6d are brought into contact with each other. It comes into contact. When the outer shim plate 9 and the inner shim plate 8 have been used for many years and the locking state between the locking pieces 8d, 8e, 9d, 9e and the back plate 6b has become loose, the outer shim plate 9 and the inner shim plate 8 The position of the outer shim plate 9 and the inner shim plate 8 is shifted most in the circumferential direction of the disk, for example, the stopper piece 9c on the disk insertion side of the outer shim plate 9 is moved backward. The torque receiving surface 3d of the caliper bracket 3 is brought into contact with the torque receiving portion 3h of the caliper bracket 3 because the back plate 6b and the inner shim plate 8 are dragged toward the disk discharging side. Even when the contact state is reached, the distance L1 between the stopper piece 9c of the outer shim plate 9 and the torque receiving portion 3h of the caliper bracket 3 is set to be equal to that of the lower locking piece 9e of the outer shim plate 9 and the inner side as described above. Distance L between shim plate 8 and lower locking piece 8e And the upper locking piece 9d of the outer shim plate 9 and the lower locking piece 8e of the inner shim plate 8 and the upper locking piece 9d of the outer shim plate 9 By setting it to be smaller than the separation distance L4 of the upper locking piece 8d of the inner shim plate 8, the adjacent lower locking pieces 8e, 9e do not come into contact with each other, and the adjacent upper locking piece 8d , 9d also do not come into contact with each other, so that there is no possibility that the locking pieces 8d, 8e, 9d, 9e are damaged.

  In the above-described embodiment, the inner shim plate and the outer shim plate that are attached to the friction pad on the working unit side are the conventional ones that are formed smaller than the back shape of the back plate. The present invention using the outer shim plate and the inner shim plate as in the above-described embodiments can also be applied to the respective friction pads.

It is a principal part expansion explanatory drawing of the disc brake which shows one example of this invention. It is a disassembled perspective view of a friction pad, an inner shim board, and an outer shim board similarly. It is a front view of a disk brake similarly. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a partial cross-section rear view of the disc brake. It is a partial cross section top view of a disk brake similarly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Car body fixed part, 3b ... Caliper support arm, 3c ... Friction pad holding part, 3d ... Caliper support part, 3e ... Fastening bolt mounting part, 3f ... Pad guide groove, 3g ... pin insertion hole, 3h ... torque receiving part, 4 ... slide pin, 5 ... caliper body, 5a ... action part, 5b ... reaction part, 5c ... bridge part, 5d ... body mounting arm, 5e ... cylinder Hole, 5f ... Reaction force claw, 6 ... Friction pad, 6a ... Lining, 6b ... Back plate, 6c ... Ear piece, 6d ... Torque transmission surface, 6e ... Disc outer peripheral side, 6f ... Disc inner peripheral side, 6g ... Position restriction Projection, 7 ... piston, 8 ... inner shim plate, 8a ... outer edge, 8b ... inner edge, 8c ... projection, 8d ... upper locking piece, 8e ... lower locking piece, 9 ... outer shim plate, 9a ... outer edge, 9b ... inner edge, 9c ... Stopper piece, 9d ... the upper locking pieces, 9e ... lower locking piece

Claims (2)

A caliper body that integrally connects a working part disposed on one side of the disk rotor and a reaction part disposed on the other side of the disk rotor with a bridge portion that extends outside the disk rotor is fixed to the vehicle body. The caliper bracket is slidably supported by a pair of caliper support arms that straddle the outer periphery of the disc rotor in the disc axial direction, and a pair of friction pads are disposed opposite to each other with the disc rotor interposed between the action portion and the reaction portion. An outer shim plate and an inner shim plate are superposed on the back side of the back plate of the friction pad, and the outer shim plate and the inner shim plate are respectively connected to the disc inner peripheral side and the disc outer peripheral side. A locking piece is formed, and the locking piece of the outer shim plate and the locking piece of the inner shim plate on one side are adjacent to each other and engaged with the back plate, respectively, and the caliper is attached to the back plate during braking. Support arm torque In the disc brake for a vehicle having a torque transmission surface that abuts on the portion and transmits a braking torque, and a position restricting projection that prevents a displacement of the inner shim plate, the outer shim plate is disposed on both sides of the disc circumferential direction. A stopper piece extending to the vicinity of the torque transmission surface of the back plate, and a friction pad having an inner shim plate and an outer shim plate attached to the back plate is attached to the caliper bracket. The separation distance between the receiving portion is the separation distance between the engagement piece of the adjacent outer shim plate and the engagement piece of the inner shim plate, and the separation distance between the adjacent position restricting projection and the engagement piece of the inner shim plate. A vehicle disc brake characterized by being smaller than the sum. Friction in which the engaging piece of the outer shim plate on the other side and the engaging piece of the inner shim plate are adjacently engaged with the back plate, and the inner shim plate and the outer shim plate are attached to the back plate. With the pad attached to the caliper bracket, the separation distance between the stopper piece and the torque receiving portion is smaller than the separation distance between the locking piece of the outer shim plate on the other side and the locking piece of the inner shim plate. The vehicle disc brake according to claim 1.

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