JP2006038135A - Vehicular disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent as much as possible brake noises by stably operating a friction pad while preventing the concentration of braking torque via an angle portion on the inside of a lug piece of a friction pad in a disc radial direction onto a corner portion on the inside of the corner end wall of a pad guide groove in the disc radial direction. <P>SOLUTION: The pad guide groove 3c is formed in a caliper supporting arm 3a of a caliper bracket 3. The lug pieces 13a, 13b are provided projecting on the side of a back plate 13 of the friction pad 11. In such a manner that the projection of the end face 13b on the disc turn-out/turn-in side of each lug piece 13a to the inside in the disc radial direction is shorter than the projection to the outside in the disc radial direction, the lug piece 13a is formed in a stepped shape with the end face 13b having a non-abutting face 13c on the inside in the disc radial direction. The non-abutting face 13c forms a cavity portion E between the angle portion 13f of the lug piece 13a and the corner portion 3g of the corner end wall 3f of the pad guide groove 3d. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle disc brake used in a vehicle such as an automobile or a motorcycle, and more specifically, ear pieces projecting on both sides of a back plate of a friction pad, and the ear pieces are supported and the ear pieces. The present invention relates to the structure of a pad guide groove that receives more braking torque.

Conventionally, a vehicular disc brake in which an ear piece projecting on both sides of a back plate is supported in a pad guide groove provided on either a caliper bracket or a caliper body so as to be movable in the disc axial direction is formed in a U shape. An ear piece formed in a substantially rectangular shape is fitted into the pad guide groove, and the inner wall of the pad guide groove and the outer surface of the ear piece are in contact with each other with a substantially no gap through the pad retainer. This friction pad is dragged in the rotational direction of the disk rotor by the braking torque generated by sliding contact with the disk rotor during braking, and the end surface of the ear piece on the disk delivery side is pressed against the back end wall of the pad guide groove, The braking torque is transmitted from the rear end wall to the caliper bracket or the caliper body (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-63041 (page 3, FIG. 4, FIG. 5)

  However, since the braking torque applied to the friction pad is directed in the rotational direction of the disk rotor, in the above-described friction pad, the braking torque from the corner of the ear piece in the radial direction of the disk to the back of the pad guide groove where the corner abuts. Concentrated at the corner of the end wall in the radial direction of the disk, it is transmitted to the caliper bracket, which becomes an unbalanced load, causing the friction pad to vibrate and generating brake noise.

  Therefore, the present invention prevents the braking torque from concentrating on the corner portion of the back end wall of the pad guide groove through the corner portion of the ear piece, and forms the braking torque on either the caliper bracket or the caliper body. An object of the present invention is to provide a vehicular disc brake capable of stably operating the friction pad and preventing the occurrence of brake squealing as much as possible by receiving it over a wide range of the back end wall of the pad guide groove.

  In order to achieve the above object, the present invention provides a pad guide groove extending in the disk axial direction on either the caliper bracket or the caliper body so as to face both sides of the back plate of the friction pad disposed with the disk rotor interposed therebetween. Ear pieces projecting from each other, the ear pieces are fitted into the pad guide grooves to support the friction pad so as to be movable in the disk axial direction, and braking torque is transmitted from the ear pieces through the pad guide grooves. In a vehicle disc brake received by either a caliper bracket or a caliper body, a gap is provided between a corner on the inner side in the disc radial direction of the ear piece and a corner on the inner side in the disc radial direction of the pad guide groove. In addition, the gap is formed by a recess formed at an inner end of the ear piece in the radial direction of the disk or a disk half of the pad guide groove. It is characterized by being provided by a recess formed at the inner end in the direction, or by a recess formed at the inner end in the disk radial direction of the ear piece and the inner end in the disk radial direction of the pad guide groove, respectively. .

  According to the present invention, it is possible to receive a braking torque at a wide portion of the back end wall of the pad guide groove through the disk insertion / extraction side end surface of the ear piece projecting on the back plate of the friction pad. Thus, the friction pad can be prevented from vibrating during braking, and the occurrence of brake squealing can be prevented as much as possible.

  Hereinafter, a first embodiment in which the present invention is applied to a pin slide type disc brake will be described with reference to FIGS. The arrow A in the figure indicates the direction of rotation of the disc rotor during forward traveling of the vehicle, and the disc insertion side and disc outlet side used in the following description are for the case of forward traveling of the vehicle.

  The disc brake 1 is provided with a caliper bracket 3 fixed to the vehicle body on one side surface of a disc rotor 2 that rotates in the direction of arrow A, and the outside of the disc rotor 2 extends parallel to the disc axial direction from the caliper bracket 3. A caliper body 4 is supported by a pair of extended caliper support arms 3a and 3a via a pair of sliding pins 5 and 5 so as to be movable in the disk axial direction.

  The caliper body 4 is obtained by connecting an action part 4 a arranged on one side of the disk rotor 2 and a reaction part 4 b arranged on the other side of the disk rotor 2 by a bridge part 4 c straddling the outer edge of the disk rotor 2. Thus, cylinder holes 4d and 4d are provided in the action portion 4a so as to open the disk rotor 2 side. Pistons 6 and 6 are inserted into the cylinder holes 4d and 4d in a fluid-tight and movable manner, and the pistons 6 and 6 are supplied to hydraulic chambers 7 and 7 defined at the bottoms of the cylinder holes 4d and 4d. It moves in the direction of the disk rotor 2 by the pressurized liquid. Further, vehicle body mounting arms 4e and 4e project from the side of the action portion 4a, and the above-mentioned sliding pins 5 project from mounting bolts 8 at the tips of the respective vehicle body mounting arms 4e. Has been.

  The caliper support arms 3a, 3a straddle the outer edge of the disc rotor 2 in the disc axial direction while sandwiching both sides of the bridge portion 4c from both sides of the caliper bracket 3, and further on the other side of the disc rotor 2 at the reaction portion 4b. The shape extends along the side wall toward the center of the disk. Further, the distal end portions of the caliper support arms 3a and 3a are connected by a tie rod 3b to enhance the rigidity of both the support arms 3a and 3a to which braking torque is applied.

  Both caliper support arms 3a are provided with guide holes 9 for accommodating the above-described sliding pins 5. Both the caliper support arms 3a and 3a are provided with four pad guide grooves 3c facing each other on the respective sides of the disc rotor 2. Each pad guide groove 3c is formed in a U shape having a disk radial outer wall 3d, a disk radial inner wall 3e, and a back end wall 3f connecting the walls 3d and 3e. A pad retainer 10 formed by bending a thin elastic metal material is laid in the pad guide grooves 3c, 3c.

  A pair of friction pads 11, 11 are disposed to face each other between the piston 6 and one side surface of the disk rotor 2 and between the other surface side of the disk rotor 2 and the reaction force claw 4 f of the reaction portion 4 b. Each friction pad 11 is formed by joining a lining 12 slidably in contact with the disk rotor 2 to a metal back plate 13, and a shim plate 14 is mounted on the back surface of the back plate 13.

  Ear pieces 13a and 13a projecting from both sides of the back plate 13 are fitted to the pad guide grooves 3c and 3c to support the friction pads 11 and 11 so as to be movable in the disk axial direction. Each ear piece 13a has an end surface 13b on the disk feed-out / feed-in side that abuts against the back end wall 3f of the pad guide groove 3c, a disk radial outer surface 13d that abuts against the disk radial outer wall 3d, and a disk radial direction. It has a disk radial inner surface 13e that abuts against the inner wall 3e. A pad retainer 10 is interposed between the surfaces 13b, 13d, 13e and the walls 3f, 3d, 3e.

  The end surface 13b is formed in a stepped shape with a protruding length on the inner side in the radial direction of the disk shorter than a protruding length on the outer side in the radial direction of the disk. It is said. Thus, a gap E is provided between the corner portion 13f on the inner side in the disk radial direction of the ear piece 13a and the corner portion 3g on the inner side in the disk radial direction of the back end wall 3f.

  In the present embodiment formed as described above, when the hydraulic fluid whose pressure has been increased by the braking operation is supplied to the hydraulic pressure chamber 7, the pistons 6 and 6 advance through the cylinder holes 4d and 4d, and the action portion 4a side. The friction pad 11 is pressed against one side of the disk rotor 2, and the caliper body 4 is moved in the direction of the action portion 4a while being guided by the sliding pins 5 and 5 by the reaction force of the pressing, and the reaction force claw 4f. Presses the friction pad 11 on the reaction portion 4 b side to the other side of the disk rotor 2.

  The ear pieces 13 a and 13 a of each friction pad 11 are smoothly moved in the pad guide grooves 3 c and 3 c while being guided by the pad retainer 10 during braking, and the lining 12 of the friction pad 11 is slidably contacted with the side surface of the disk rotor 2. Let Also, each friction pad 11 is dragged in the direction of arrow A by the braking torque generated by this sliding contact, and the end surface 13b of the disk delivery side of the ear piece 13a of the disk delivery side is the back end wall of the pad guide groove 3c. The braking torque is transmitted to the caliper support arm 3a of the caliper bracket 3 from the back end wall 3f by being pressed by 3f.

  At this time, the corner portion 13f on the inner side in the disk radial direction of the ear piece 13a and the corner portion 3g on the inner side in the disk radial direction of the rear end wall 3f are brought into a non-contact state by the gap portion E. It is possible to prevent torque from being concentrated on the corner 3g. Along with this, the braking torque is widely applied to the back end wall 3f of the pad guide groove 3c contacting the end surface 13b on the disk delivery side of the ear piece 13a, and the vibration of the friction pad due to the uneven load is suppressed. It is possible to suppress the occurrence of brake squealing as much as possible.

  FIG. 6 shows a second embodiment of the present invention, and FIG. 7 shows a third embodiment of the present invention. The same reference numerals are given to the same parts as the first embodiment, and the detailed description thereof is omitted. To do.

  In the second embodiment of the present invention shown in FIG. 6, the inner side in the disk radial direction of the back end wall 3i of the pad guide groove 3h is formed in a stepped shape recessed toward the outside of the bracket. In 3i, an inner wall 3k in the radial direction of the disk is disposed on the outer side of the bracket with respect to the outer wall 3j in the radial direction of the disk, and the inner wall 3k in the radial direction of the disk is a concave portion of the present invention. Further, the pad retainer 15 laid in the pad guide groove 3h has a bent portion 15a formed along the inner wall 3k in the disk radial direction.

  The ear piece 13g protruding from the back plate 13 of the friction pad 11 is formed in a substantially rectangular shape as in the prior art, and when the ear piece 13g is fitted in the pad guide groove 3h, the outer end wall 3i of the inner side in the disk radial direction is formed. The wall 3j and the end surface 13h on the disk insertion / extraction side of the ear piece 13g are in contact with each other, and a gap E is formed between the inner surface 3k in the disk radial direction of the back end wall 3i and the end surface 13h. As a result, the corner 13i on the inner side in the disk radial direction of the ear piece 13g and the corner 3m on the inner side in the disk radial direction of the pad guide groove 3h are brought into a non-contact state.

  In the third embodiment of the present invention shown in FIG. 7, the ear piece 13j has a stepped shape as in the first embodiment, and the pad guide groove 3n has a stepped shape as in the second embodiment. And the disk radial inner wall 3r form a recess according to the present invention. The disk radial outer end surface 13m of the ear piece 13j and the disk radial outer wall 3p of the pad guide groove 3n come into contact with each other. A gap E is formed between the end surface 13k on the inner side in the disc radial direction of 13j and the inner side wall 3r in the disc radial direction of the pad guide groove 3n. As a result, the corner 13n in the disk radial direction of the ear piece 13j and the corner 3q in the disk radial direction of the pad guide groove 3n are brought into a non-contact state. Further, in the pad retainer 16 of the present embodiment example, similarly to the second embodiment example, a bent portion 16a is formed along the disk radial direction inner wall 3p of the pad guide groove 3n.

  In the second and third embodiments, as in the first embodiment, the braking torque is not concentrated on the inner corner of the pad guide groove in the radial direction of the disk due to the presence of the gap E. Vibration can be suppressed.

  In the second and third embodiments described above, the pad retainer is formed with a bent portion along the shape of the back end wall of the pad guide groove, but a conventional pad retainer that does not have a bent portion is used. Even when a conventional pad retainer is used, the corner of the ear piece in the radial direction of the disk does not press the corner of the pad guide groove in the radial direction of the disk during braking. Can be fully exhibited.

  Further, the present invention is not limited to the case where the ear piece or the pad guide groove is formed in a stepped shape to form the recess as in the above-described embodiments, but the end of the ear piece on the inner side in the disk radial direction is inclined obliquely. The corners on the inner side of the disk radial direction of the ear piece and the inner wall of the pad guide groove on the inner side of the disk radial direction Any shape can be used as long as a gap is formed between the inner corners. Furthermore, the present invention is not limited to being applied to a pin slide type disc brake as in the above-described embodiment, but can also be applied to an opposing type disc brake having a caliper body provided with a pad guide groove. It is not limited to a U-shape, but may be an L-shape with an open upper surface.

It is principal part sectional drawing of the disc brake which shows the 1st example of this invention. 1 is a partially sectional rear view of a disc brake showing a first embodiment of the present invention. 1 is a plan view of a disc brake showing a first embodiment of the present invention. It is IV-IV sectional drawing of FIG. 1 is a front view of a disc brake showing a first embodiment of the present invention. It is principal part sectional drawing of the disc brake which shows the 2nd form example of this invention. It is principal part sectional drawing of the disc brake which shows the 3rd example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3c, 3h, 3n ... Pad guide groove, 3f ... Back end wall, 3g, 3m, 3q ... Corner, 4 ... Caliper body 4a ... action part, 4b ... reaction part, 4c ... bridge part, 4d ... cylinder hole, 4e ... body mounting arm, 5 ... sliding pin, 6 ... piston, 7 ... hydraulic chamber, 11 ... friction pad, 12 ... Lining, 13 ... back plate, 13a, 13g, 13n ... ear piece, 13b, 13h, 13m ... end face on the disk entry / exit side, 13c, 13k ... end face in the disk radial direction, 13f, 13i, 13n ... corner Part, E ... void

Claims (4)

A pad guide groove extending in the disk axial direction is formed oppositely on either the caliper bracket or the caliper body, and ear pieces are provided on both sides of the back side of the friction pad disposed with the disk rotor interposed therebetween. Is mounted on the pad guide groove to support the friction pad so as to be movable in the disc axial direction, and receives braking torque from the ear piece through the pad guide groove by either the caliper bracket or the caliper body. A disc brake for a vehicle, wherein a gap portion is provided between a corner portion on the inner side in the disc radial direction of the ear piece and a corner portion on the inner side in the disc radial direction of the pad guide groove. 2. The vehicle disc brake according to claim 1, wherein the gap portion is provided by a concave portion formed at an end portion on the inner side in the disc radial direction of the ear piece. 2. The vehicle disc brake according to claim 1, wherein the gap portion is provided by a concave portion formed at an end portion in the disc radial direction of the pad guide groove. 2. The vehicle according to claim 1, wherein the gap is provided by a concave portion formed at each of an end portion in the disk radial direction of the ear piece and an end portion in the disk radial direction of the pad guide groove. Disc brake.

Images