JP2002257164A - Disk brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk brake for a vehicle capable of controlling inclination of a friction pad to the side surface of a disk rotor as far as possible and also effectively preventing partial wear of a lining even though partial load from a piston and a counter-force claw is applied to the friction pad when braking. SOLUTION: Flanged portions 17a and 17a with a full length L2 adding both the thickness T of the back plate 17 and a projected length L1 are formed at both side portions of a back plate 17. The friction pad 6 is movably suspended in a disk-axis direction by accommodating the flanged portions 17a and 17a in a pad guide grooves 8 and 8 of a caliper supporting arms 3a and 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used for various traveling vehicles such as automobiles and motorcycles. More specifically, the present invention relates to a friction pad for a friction pad when a caliper body has a C-shape due to a braking reaction force. The present invention relates to a disc brake structure in which the lining is prevented from being unevenly worn as much as possible.

[0002]

2. Description of the Related Art As a general brake used in automobiles and the like, there is one disclosed in Japanese Patent Application Laid-Open No. H11-63041, for example. In this disc brake, a pair of caliper support arms extending parallel to the outer periphery of the disc rotor with a bridge portion of the caliper body interposed therebetween are extended on a caliper bracket fixed to the vehicle body at one side of the disc rotor. The caliper body is supported movably in the disk axial direction via a pair of slide pins inserted through the support arm.

[0003] On both sides of the disk rotor, a working portion and a reaction portion of the caliper body are located, and a pair of friction pads are arranged between the working portion and the reaction portion so as to face each other with the disk rotor interposed therebetween. The lugs projecting straight from the back plate of the friction pad from the back plate to the disc inflow side and the outflow side are housed in the pad receiving recesses facing the caliper support arm, and both friction pads are moved in the disc axial direction. When the brake is applied, both friction pads are pushed in the direction of the disc rotor by the piston on the action part side and the reaction force claw on the reaction part side, and the linings of the friction pads are brought into sliding contact with both side faces of the disc rotor. The braking action is performed.

[0004]

In such a disk brake, the braking reaction force from the disk rotor acts on the piston and the reaction force claw through the friction pad, and furthermore, the action portion and the reaction portion are separated from each other by the anti-disc. The caliper body is tilted so that the inner circumferential side of the disk of the action portion and the reaction portion is opened more outward than the outer circumference of the disk, and the caliper body is deformed in a C-shape with the bridge portion as a fulcrum.

[0005] As a result, the friction pad is pressed against the disc rotor by the piston and the reaction force claw which are inclined in the same manner as the action portion and the reaction portion, and the disc inner periphery is weakly pressed against the disc rotor. As in the case of the piston or the reaction claw, the lining is inclined to cause uneven wear of the lining.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle disc brake which can prevent uneven wear of a lining of a friction pad as much as possible even when the caliper body has a C-shape.

[0007]

SUMMARY OF THE INVENTION According to the present invention, according to the above-mentioned object, an action portion and a reaction portion provided on one side and the other side of a disk rotor are provided across the outer periphery of the disk rotor. Caliper body connected with the bridge part to be set up,
A caliper bracket fixed to the vehicle body at one side of the disc rotor, and a pair of caliper support arms extending parallel to the outer periphery of the disc rotor with the bridge portion interposed therebetween. The caliper body is movably supported in the disk axial direction via a pair of slide pins inserted through the caliper support arm, and a pair of friction pads are opposed to each other with the disk rotor interposed between the working portion and the reaction portion. The ear pads provided on the back plate of the friction pad on the disk reversing side and the revolving side of the friction pad are accommodated in a pad receiving recess in the disk axial direction opposed to the pair of caliper supporting arms, and A disc brake for a vehicle that supports a friction pad so as to be movable in a disc axial direction, wherein the lugs project from the back plate in the pad receiving recess in the disc axial direction. It is characterized in that the.

[0008] The friction pad at the time of braking receives different pressing forces from the piston and the reaction force claw on the disk outer peripheral side and the disk inner periphery side due to the C-shaped deformation of the caliper body, and like the piston and the reaction force claw, The outer circumference of the disk approaches the disk rotor, and the inner circumference of the disk tilts away from the disk rotor.However, each friction pad uses a caliper bracket whose ears on the back plate are not affected by the braking reaction force. The pad is supported by the length of the plate thickness plus the protruding part in the disk axis direction, so the friction pad can well withstand the uneven load from the piston and reaction claw, facing the side of the disk rotor. Will be maintained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The disc brake 1 includes a disc rotor 2 rotating in the direction of arrow A,
A caliper bracket 3 fixed to the vehicle body at one side of the
A pin slide type caliper body 5 supported on the caliper bracket 3 via a pair of slide pins 4 and 4 so as to be movable in the axial direction of the disc, and a disc between the action portion 5a and the reaction portion 5b of the caliper body 5 It is composed of a pair of friction pads 6 and 6 that are opposed to each other with the rotor 2 interposed therebetween.

The caliper bracket 3 has a pair of caliper support arms 3a, 3a which straddle the outer periphery of the disk rotor 2 in parallel.
The caliper support arm 3a is provided with a pin hole 7 having a bottom and opening on one side of the disk rotor 2 inside the caliper support arm 3a. Pad guide grooves 8, 8, 8, 8 in the disk axial direction are provided on the side surfaces of the bridge portions of the caliper support arms 3a, 3a at four positions on one side and the other side across the disk rotor 2. Have been. The pad guide grooves 8, 8, 8, 8 are vertically rectangular in cross section having upper and lower jaws, and are formed along the disk axis direction with their openings facing each other.

The caliper body 5 is provided with the above-mentioned working portion 5a and the reaction portion 5b which are arranged on both sides of the disk rotor 2.
And a bridge portion 5c for connecting these members across the outer periphery of the disk rotor 2 between the caliper support arms 3a. On both sides of the action portion 5a, a pair of vehicle body mounting arms 5d, 5d are provided so as to protrude in parallel with one side surface of the disk rotor 2, and the above-mentioned slide pin protruded from the tip of the vehicle body mounting arms 5d, 5d. The caliper body 5 is supported so as to be movable in the axial direction of the disk by inserting the caliper 4 and 4 into the pin holes 7 of the caliper support arm 3a.

The working portion 5a is provided with a bottomed cylinder hole 10 opened to the disk rotor 2 side, and a bottomed cylindrical piston 11 is provided in the cylinder hole 10 by using a piston seal 12 and a dust seal 13. The pair of reaction force claws 5e, 5e,
5e are provided side by side in the disk circumferential direction. Piston 11
A hydraulic chamber 14 is defined between the hydraulic chamber 14 and the bottom wall 5f of the cylinder hole 10, and a union hole 15 is provided in the bottom wall 5f so as to communicate with the hydraulic chamber 14. The hydraulic fluid pressurized by the master cylinder is supplied from the union hole 15 to the hydraulic chamber 1
4 is introduced.

The friction pad 6 includes a lining 16 that slides on the side surface of the disk rotor 2 and a back plate 17 that holds the lining 16.
Ear pieces 17a, 17a protrude from both sides of the back plate 17 which is disposed on the disk revolving side and the revolving side at the time of mounting on the discs a, 3a. Each back plate 17 is formed by punching a metal plate such as a steel plate with a press machine, and rectangularly folding a long piece having the same width as the pad guide groove 8 protruding on both sides in a direction opposite to the lining attachment surface. Ear pieces 17a, 17a having a total length L2 obtained by adding the projection length L1 to the thickness T of the plate 17 are formed.

The lugs 17a, 17a of the back plate 17 are accommodated in the pad guide grooves 8, 8 of the caliper support arms 3a, 3a in the axial direction of the disk on the working portion side and the reaction portion side of the disk rotor 2. Then, each of the friction pads 6 is suspended so as to be movable in the disk axial direction.

This embodiment is configured as described above.
When the hydraulic fluid pressurized by the hydraulic master cylinder is supplied to the hydraulic chamber 14 of the caliper body 5 by the braking operation of the driver, the piston 11 advances through the cylinder hole 10 in the direction of the opening, and the friction pad on the action portion side. 6 and the friction pad 6
Of the disk rotor 2 in sliding contact with the lining 16 of the disk rotor 2. The caliper body 5 moves in the direction of the acting portion while being guided by the slide pins 4 and 4 due to this reaction, and the reaction force claws 5e and 5e of the reaction portion 5b push the friction pad 6 on the reaction portion side, and the friction pad 6 linings 16
Is brought into sliding contact with the side of the reaction portion of the disk rotor 2 to perform a braking action.

At the time of the above-described braking, a braking reaction force from the disk rotor 2 acts on the piston 11 and the reaction force claws 5e, 5e through the friction pads 6, 6, and furthermore, the action part 5a and the reaction part 5b are moved in the direction opposite to the disk. And the caliper body 5 is deformed in a C-shape supporting the bridge portion 5c.

As a result, the pressing force of the piston 11 and the reaction force claws 5e, 5e acts on the friction pads 6, 6 strongly on the outer peripheral side of the disk and weakly on the inner peripheral side of the disk. I try to tilt it like the claws 5e, 5e,
Each of the friction pads 6 has an ear piece 17a, 17a of the back plate 17,
The friction pads 6 are supported by the pad guide grooves 8, 8 of the caliper support arms 3a, 3a, which are not affected by the braking reaction force, with a total length L2 longer than the thickness T of the conventional back plate. It can well withstand the unbalanced load from the reaction force claws 5e, 5e, the inclination of the disk rotor 2 to the side surface is suppressed as much as possible, and the uneven wear of the lining 16 can be effectively prevented.

When the ear piece of the back plate is protruded toward the lining adhering surface, if the user continues to use the friction pad even if the usage limit of the lining is exceeded, the tip of the ear piece becomes a disc rotor. It is thought that it is desirable to protrude in the opposite direction to the lining sticking surface as in the embodiment, since the sliding contact with the side surface of A deliberate occurrence can also signal that the lining has exceeded its service limit.

Further, the ear piece may be formed separately from the back plate and attached by fixing means such as welding or riveting. When the back plate and the ear piece are separated as described above, the ear piece can be projected on both the lining sticking surface side and the anti-lining sticking surface side. The inclination of the pad can be further prevented.

[0020]

As described above, according to the vehicle disc brake of the present invention, a C-shaped deformation occurs in the caliper body due to the braking reaction force, and the piston or the reaction force claw is applied to the friction pad during braking. Even if an uneven load is applied, the inclination of the friction pad with respect to the side surface of the disk rotor can be suppressed as much as possible, and uneven wear of the lining can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of a disc brake showing one embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view of a disc brake showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 4 ... Slide pin, 5 ... Caliper body, 5a ... Working part, 5b ... Reaction part, 5c bridge part, 5e ... Reaction force claw , 6: friction pad, 7: pin hole, 8: pad guide groove, 11: piston, 14: hydraulic chamber, 16: lining, 17: back plate, 1
7a: ear piece, T: thickness of back plate 17, L1: projection length of ear piece 17a from back plate 17, L2: total length of ear piece 17a supported by pad guide groove 8

Claims (1)

[Claims] A caliper body in which an action portion and a reaction portion provided on one side and the other side of the disk rotor are connected by a bridge portion provided over the outer periphery of the disk rotor; A caliper bracket fixedly mounted on the vehicle body at one side of the disc rotor, and a pair of caliper support arms extending parallel to the outer periphery of the disc rotor with the bridge portion interposed therebetween; The caliper body is movably supported in a disk axial direction via a pair of slide pins inserted through a support arm, and a pair of friction pads are opposed to each other with the disk rotor interposed between the operating portion and the reaction portion. Then, the lugs provided on the disc reciprocating side and the revolving side of the back plate of the friction pad are accommodated in the disc receiving pad recesses in the disc axial direction facing the pair of caliper supporting arms. A vehicle disc brake for supporting the friction pad so as to be movable in the disc axis direction, wherein the lugs are formed in a shape protruding from the back plate in the pad receiving recess in the disc axis direction. For disc brakes.