JP2006336784A - Vehicular disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the looseness of a friction pad during braking and prevent the generation of abnormal noises and uplift of the friction pad. <P>SOLUTION: A caliper bracket 3 has a pair of caliper supporting arms 3a, 3b extending over the outer edge of a disc rotor 2 and pad guide grooves 3c, 3d opposed to each other and provided on both caliper supporting arms 3a, 3b. Ear pieces 6b, 6c of the friction pad 6 are borne in the pad guide grooves 3c, 3d via pad retainers 9, 10. The pad retainer 9 is arranged between the pad guide groove 3c and the ear piece 6b on a disc turn-in side during forward movement of a vehicle, and it has an elastic thrust portion 9a provided at an abutting portion of the ear piece 6b on a disc turn-in side end face 6e and curved and protruded to the disc turn-in side. The elastic thrust portion 9a consists of an outer periphery side elastic thrust portion 9e for abutting on the disc outer periphery side of the ear piece 6b and an inner periphery side elastic thrust portion 9f for abutting on the disc inner periphery side of the ear piece 6b. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 from both sides of the friction pad back plate are supported by pad guide grooves formed on the caliper support arm of the caliper bracket, and the friction pad is suspended so as to be movable in the disk axis direction. In the disc brake to be held, 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.

The pad retainer is arranged between the pad guide groove on the disk delivery side and the disk delivery side end face of the ear piece when the vehicle moves forward, and brake torque is supplied from the disk delivery side end face of the ear piece to the pad guide. Some have an elastic member that elastically transmits to the groove, and the elastic member absorbs the vibration of the friction pad to prevent the generation of abnormal noise (see, for example, Patent Document 1).
JP-A-4-107330

  However, in the above, when the friction pad is dragged to the disk delivery side during braking and the disk delivery side end surface of the friction pad ear piece is pressed against the pad guide groove, the ear piece and the pad guide on the disk delivery side are pressed. There was a possibility that a gap was formed between the grooves and the friction pad would be loose.

  Accordingly, an object of the present invention is to provide a vehicle disc brake that can prevent the friction pad from rattling during braking, and can prevent the generation of abnormal noise and the lifting of the friction pad.

  In order to achieve the above object, a first invention provides a caliper bracket fixed to a vehicle body with a pair of caliper support arms extending across the outer edge of the disc rotor in the disc axial direction, and pad guides on both caliper support arms. Vehicles that are provided with grooves facing each other, projecting ear pieces on both sides of the back side of the friction pad disposed across the disk rotor, and supporting the ear pieces in the pad guide groove via a pad retainer In the disc brake for a vehicle, the pad retainer disposed between the pad guide groove on the disk insertion side and the ear piece when the vehicle moves forward is provided on a contact surface of the ear piece with the disk insertion side end surface. An elastic pressing portion that curves and protrudes toward the disk delivery side is provided.

  According to a second aspect of the invention, the elastic pressing portion includes an outer peripheral elastic pressing portion that contacts the outer peripheral side of the disk of the ear piece, and an inner peripheral elastic pressing portion that contacts the inner peripheral side of the disk of the ear piece. It is characterized by being.

  With this configuration, according to the first aspect of the present invention, even when the friction pad is dragged to the disk delivery side when the vehicle is moving forward, the friction pad on the disk entry side is affected by the elasticity of the elastic pressing portion of the pad retainer. Since the ear piece is pressed to the disk delivery side, the friction pad can be prevented from rattling, and the generation of abnormal noise and the friction pad can be prevented from rising.

  In the second aspect of the invention, the outer peripheral side elastic pressing portion and the inner peripheral side elastic pressing portion press the ear piece on the disk insertion side to the disk outlet side and are generated by the inner peripheral side elastic pressing portion during braking. It is possible to effectively prevent the friction pad from lifting.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is an enlarged sectional view of a main part of a disc brake showing an embodiment of the present invention, FIG. 2 is a perspective view of a pad retainer, FIG. 3 is a front view of the disc brake, and FIG. 4 is a sectional view taken along line IV-IV in FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4, and FIG. 6 is a 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 insertion side and the outlet side used in the following description are for forward traveling of the vehicle.

  The disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel, a caliper bracket 3 that is fixed to the vehicle body at one side of the disc rotor 2, and a pair of caliper support arms 3a and 3b of the caliper bracket 3. The caliper body 5 supported so as to be movable in the disk axial direction via the slide pins 4a and 4b, 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.

  The caliper body 5 includes the above-described action part 5 a and reaction part 5 b disposed on both sides of the disk rotor 2, and a bridge part 5 c that connects them across the outer peripheral side of the disk rotor 2. A cylinder hole 7 having an opening on the disk rotor 2 side is provided in the action portion 5a. The bottomed cylindrical piston 8 is accommodated in the cylinder hole 7, and the piston 8 is moved in the direction of the disk rotor by the pressurized liquid supplied to the hydraulic chamber at the bottom of the cylinder hole. . 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. .

  The caliper support arm 3a on the disk feed-in side and the caliper support arm 3b on the disk feed-out side straddle the outer edge of the disk rotor 2 from both sides of the caliper bracket 3 across both sides of the bridge portion 5c in the disc axial direction. Further, the other side of the disk rotor 2 has a shape extending toward the center of the disk along the side wall of the reaction portion 5b. Both of the caliper support arms 3a and 3b are provided with a disk guide-side pad guide groove 3c and a disk-feed-side pad guide groove 3d facing each other on the respective sides of the disk rotor 2. The pad guide grooves 3c and 3d are orthogonal to the torque receiving surfaces 3e and 3f parallel to the center line CL connecting the center of the disc rotor 2 and the center of the cylinder hole, and orthogonal to the inner peripheral side of the torque receiving surfaces 3e and 3f. It is formed in the step shape provided with the pad support surfaces 3g and 3h which protrude in a direction, respectively. Each friction pad 6 includes a disc insertion-side ear piece 6b protruding from both side portions of the back plate 6a and a disc delivery-side ear piece 6c. The disc guide-side and delivery-side pad guide grooves 3c, 3d is supported via pad retainers 9 and 10, respectively.

  Each friction pad 6 includes a lining 6d that is in sliding contact with the disk rotor 2, and a back plate 6a that is held by the caliper bracket 3. The ear pieces 6b and 6c are provided on both sides of the back plate 6a. . The friction pad 6 on the action part 5a side is provided with a spring mounting part protruding substantially at the center of the back surface of the back plate 6a. The piston 8 and the friction pad 6 on the action part 5a side are connected to the spring attachment part. A pad hold spring 11 is attached. A pad spring 12 is provided between each friction pad 6 and the bridge portion 5c to urge each friction pad 6 toward the disc inner periphery.

  The pad retainer 9 on the disk entry side is laid on the torque receiving surfaces 3e, 3e of the pad guide grooves 3c, 3c on both sides of the disk rotor, and the disk entry side end surfaces 6e of the ear pieces 6b, 6b of the friction pads 6, 6 are provided. A pair of elastic pressing portions 9a, 9a that abut against 6e, a pair of retainer portions 9b, 9b that are laid on the pad support surfaces 3g, 3g and abut against the disc inner peripheral end surfaces 6f, 6f of the ear pieces 6b, 6b; A connecting portion 9c that connects the upper portions of the elastic pressing portions 9a and 9a across the outer edge of the disk rotor 2 and a mounting portion 9d that is locked in the rotor groove of the caliper support arm 3a are provided.

  The elastic pressing portion 9a includes an outer peripheral elastic pressing portion 9e that comes into contact with the outer peripheral side of the disc on the disk insertion side end surface 6e of the ear piece 6b, and an inner peripheral elastic pressing portion 9f that comes into contact with the inner peripheral side of the disc. . The outer peripheral side elastic pressing part 9e and the inner peripheral side elastic pressing part 9f are formed by curved surfaces protruding to the disk delivery side, and are formed continuously in parallel with the connecting part 9c.

  The disk delivery-side pad retainer 10 is laid on the torque receiving surfaces 3f, 3f of the pad guide grooves 3d, 3d, and a pair of flat plate-like contact portions 10a that contact the disk delivery-side end surface 6g of the ear piece 6c. 10a, a pair of retainer portions 10b, 10b that are laid on the pad support surfaces 3h, 3h and abut against the inner peripheral end surface 6h of the ear piece 6c, and the abutting portions 10a, 10a across the outer edge of the disc rotor 2. A connecting portion 10c that connects the upper portions of the calipers, and a mounting portion 10d that is locked to the rotor groove of the caliper support arm 3b.

  Each friction pad 6 is always pressed to the disk delivery side by the pad retainer 9 on the disk delivery side, and the disk delivery side end surface 6g of the disk delivery-side ear piece 6c is connected to the disk delivery side pad retainer 10. The contact portion 10a is in contact with the torque receiving surface 3f of the pad guide groove 3d.

  When the pressurized hydraulic fluid is supplied to the hydraulic pressure chamber by the driver's braking operation, the disc brake 1 moves the piston 8 forward through the cylinder hole 7 so that the friction pad 6 on the acting portion 5a side is moved to the arrow A. Press against one side of the disk rotor 2 rotating in the direction. Next, the reaction force causes the caliper body 5 to move in the direction of the action portion 5 a while being guided by the slide pins 4 a and 4 b, and the reaction force claw 5 e moves the friction pad 6 on the reaction portion 5 b side to the other side of the disk rotor 2. Press. At this time, the ear piece 6c on the disk delivery side of each friction pad 6 is guided by the contact part 10a and the retainer part 10b of the pad retainer 10, and the ear piece 6b on the disk feed side is connected with the elastic pressing part 9a. Guided by the retainer portion 9b, the pad guide grooves 3c and 3d move smoothly.

  Even when the friction pad 6 is dragged to the disk delivery side by the braking torque, the outer peripheral side elastic pressing part 9e and the inner peripheral side elastic pressing part 9f of the pad retainer 9 connect the disk feeding side ear piece 6b to the disk. Since the friction pad 6 is pressed toward the outlet side, it is possible to prevent the friction pad 6 from rattling, and it is possible to effectively prevent the generation of abnormal noise and the friction pad lifting.

  Further, during braking, the friction pad 6 has a disc feeding side centered on the contact portion P between the disc outer peripheral side end of the disc feeding-side ear piece 6c and the torque receiving surface 3f of the pad guide groove 3d by braking torque. An attempt is made to rotate toward the outer periphery of the disk. However, since the inner peripheral side of the ear piece 6b on the input side of the disk is pressed toward the output side of the disk by the inner peripheral elastic pressing portion 9f, this rotation is restricted. In addition, it is possible to effectively prevent the friction pad 6 from being lifted up on the disk entry side. Further, in this embodiment, since the pad spring 12 is provided, it is possible to more reliably prevent the generation of abnormal noise and the lifting of the friction pad 6.

  In the present invention, the shape of the elastic pressing portion is not limited to the above-described embodiment, and one or a plurality of spherical protrusions may be provided.

It is a principal part expanded sectional view of the disc brake which shows one example of this invention. It is a perspective view of a pad retainer similarly. It is a front view of a disk brake similarly. It is IV-IV sectional drawing of FIG. 5 is a cross-sectional view taken along the line VV in FIG. It is a top view of a disk brake similarly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a, 3b ... Caliper support arm, 3c, 3d ... Pad guide groove, 3e, 3f ... Torque receiving surface, 3g, 3h ... Pad support surface, 4a, 4b ... slide pin, 5 ... caliper body, 5a ... action part, 5b ... reaction part, 5c ... bridge part, 5d ... body mounting arm, 5e ... reaction force claw, 6 ... friction pad, 6a ... back plate, 6b, 6c ... Ear piece, 6d ... Lining, 6e ... Disc feeding side end surface, 6f, 6h ... Disc inner peripheral side end surface, 6g ... Disc feeding side end surface, 9 ... Pad retainer, 9a ... Elastic pressing part, 9b ... Retainer part, 9c ... connecting part, 9d ... mounting part, 9e ... outer peripheral side elastic pressing part, 9f ... inner peripheral side elastic pressing, 10 ... pad retainer, 10a ... abutting part, 10b ... retainer part, 10c ... connecting part, 10d ... mounting part 11 ... pad hold spring, 12 ... pad spring

Claims (2)

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, and pad guide grooves are provided opposite to both the caliper support arms, with the disk rotor interposed therebetween. In the disc brake for a vehicle, in which ear pieces project from both sides of the back side of the friction pad to be disposed, and the ear pieces are supported by the pad guide groove via the pad retainer, the disc entry side when the vehicle advances The pad retainer disposed between the pad guide groove and the ear piece is elastically pressed so as to bend and protrude toward the disc delivery side on the contact surface with the disc entry side end surface of the ear piece. The disc brake for vehicles characterized by having a part. The elastic pressing portion includes an outer peripheral elastic pressing portion that contacts the outer peripheral side of the disk of the ear piece, and an inner peripheral elastic pressing portion that contacts the inner peripheral side of the disk of the ear piece. The disc brake for vehicles according to claim 1.

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