JP2011007338A - Disk brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rattling of a friction pad at the time of braking by preventing the occurrence of abnormal noise and the lift of the friction pad.SOLUTION: Lug pieces 6b, 6c of the friction pad 6 are supported in pad guide slots 3c, 3d through pad retainers 9, 10. The pad retainer 10, which is arranged between the pad guide slot 3d of the disk turning-out side and the lug piece 6c, is equipped with a tabular contact part laid on a torque receiving face of the pad guide slot 3c. The pad retainer 9, which is arranged between the pad guide slot 3c of the disk turning-in side and the lug piece 6b, is equipped with the elastic pressing part 9a in the contact part with the disk turning-in end face 6e of the lug piece 6b. The elastic pressing part 9a is equipped with the outer circumference side elastic pressing part 9e which is curved to project to the disk turning-out side in contact with the disk outer circumference side of the lug piece 6b and the inner circumference side elastic pressing part 9f which is curved to project to the disk turning-out side in contact with the disk inner circumference side of the lug piece 6b.

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 disposed between the pad guide groove on the disk delivery side and the disk delivery side end surface of the ear piece when the vehicle moves forward, and brake torque is transmitted from the disk delivery side end surface of the ear piece to the pad guide. Some have an elastic member that elastically transmits to the groove, and this 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 pads would be loose.

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

  The present invention, a caliper bracket fixed to the vehicle body, a pair of caliper support arms extending across the outer periphery of the disk rotor in the disk axial direction, and both caliper support arms, a pad guide groove on the disk entry side, A disk guide side pad guide groove is provided facing each other, and each pad guide groove has a torque receiving surface parallel to a center line connecting the center of the disk rotor and the center of the cylinder hole, and a disk on each torque receiving surface. A pad support surface projecting in an orthogonal direction from the inner peripheral side, each of which is formed in a step shape, and ear pieces projectingly provided on both sides of the back plate of the friction pad disposed across the disk rotor, In a vehicle disc brake in which an ear piece is supported on the pad guide groove via a pad retainer, the pad guide groove on the disk delivery side when the vehicle is moving forward and the pad guide groove are supported. The pad retainers on the disk delivery side disposed between the ear pieces are laid on the torque receiving surfaces of the pad guide grooves on the disk delivery side on both sides of the disk rotor, respectively. A pair of flat plate-shaped contact portions that contact the disk delivery side end surface of the piece, and a pair of abutments that are laid on the disk support side pad support surface and contact the disk inner peripheral side end surface of the disk delivery side ear piece The pad retainer on the disk insertion side disposed between the pad guide groove on the disk insertion side and the ear piece supported on the pad guide groove. A pair of elastic pressing portions that are respectively laid on the torque receiving surface of the pad guide groove on the turn-in side and abut on the disk turn-side end surface of the ear piece on the disk turn-in side, and the disk support A pair of retainer portions that come into contact with the inner peripheral end surface of the disk of the ear piece on the side, and the elastic pressing portion is an outer peripheral elastic pressing portion that always comes into contact with the outer peripheral side of the disc on the end surface of the ear of the ear piece. And an inner circumferential elastic pressing portion that is always in contact with the inner circumferential side of the disk on the disk entry side end surface of the ear piece, and the outer circumferential elastic pressing portion and the inner circumferential elastic pressing portion are respectively provided on the disk delivery side. The curved surface of the outer peripheral side elastic pressing portion and the curved surface of the inner peripheral side elastic pressing portion are formed continuously in parallel with each other.

  With this configuration, in the present invention, even when the friction pad is dragged to the disk delivery side when the vehicle moves forward, the outer peripheral side elastic pressing portion and the inner peripheral side elastic force provided on the elastic pressing portion of the pad retainer are applied. The pressing portion presses the disc feeding-side ear piece toward the disc feeding side, and the inner circumferential elastic pressing portion can prevent the friction pad from being lifted during braking, and the friction pad It is possible to prevent sticking and abnormal noise.

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.

  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 disc rotor 2 from both sides of the caliper bracket 3 across the 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 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, 3d are orthogonal to the torque receiving surfaces 3e, 3f parallel to the center line CL connecting the center of the disc rotor 2 and the center of the cylinder hole, and the torque receiving surfaces 3e, 3f are orthogonal to the inner peripheral side of the disc. 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 delivery 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 lifting of the friction pad.

  Further, during braking, the friction pad 6 has a disc feeding side centered on a contact portion P between the disc outer peripheral 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 periphery of the disk 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. Thus, 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.

  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 part, 10 ... pad retainer, 10a ... contact part, 10b ... retainer part, 10c ... connecting part, 10d ... attachment , 11 ... pad hold spring, 12 ... pad spring

Claims (1)

A pair of caliper support arms that straddle the outer edge of the disk rotor in the disk axial direction are extended to a caliper bracket that is fixed to the vehicle body, and both caliper support arms have a pad guide groove on the disk entry side and a disk delivery side. The pad guide grooves are opposed to each other, and each pad guide groove has a torque receiving surface parallel to a center line connecting the center of the disk rotor and the center of the cylinder hole, and a disc inner side of each torque receiving surface. Ear pieces are provided on both sides of the back plate of the friction pad, which is formed in a step shape with pad support surfaces projecting in the orthogonal direction, and arranged with the disc rotor interposed therebetween, and the ear pieces are padded. In a vehicle disc brake supported on the pad guide groove via a retainer, the pad guide groove on the disk delivery side when the vehicle moves forward and before being supported on the pad guide groove The disk retainer on the disk delivery side arranged between the ear pieces is laid on the torque receiving surface of the pad guide groove on the disk delivery side on both sides of the disk rotor, and the disk of the ear piece on the disk delivery side. A pair of flat plate-shaped abutting portions that come into contact with the delivery side end surface; and a pair of retainer portions that are laid on the pad support surface on the disc delivery side and come into contact with the inner circumferential side end surface of the ear piece on the disc delivery side; The pad retainer on the disk insertion side disposed between the pad guide groove on the disk insertion side and the ear piece supported on the pad guide groove is provided on both sides of the disk rotor. A pair of elastic pressing portions that are respectively laid on the torque receiving surface of the pad guide groove and abut against the disk insertion side end surface of the disk insertion side ear piece, and the ear of the disk insertion side that is laid on the pad support surface Fragment A pair of retainer portions that contact the inner peripheral end surface of the disc, and the elastic pressing portion includes an outer peripheral elastic pressing portion that is always in contact with the outer peripheral side of the disc on the disk insertion side end surface of the ear piece; An inner circumferential elastic pressing portion that is always in contact with the inner circumferential side of the disk on the disk entry side end surface, and the outer circumferential elastic pressing portion and the inner circumferential elastic pressing portion each protrude on the disk delivery side. And the curved surface of the outer peripheral elastic pressing portion and the curved surface of the inner peripheral elastic pressing portion are formed continuously in parallel with each other.

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