JPH1061696A - Disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly press a pair of friction pads even if there is a difference in height in the peripheral edge of an opening part of a caliper body by making an engaging part of a pad spring engage with the caliper body in such a manner as to stride over the butt parts of a pair of caliper half bodies. SOLUTION: Friction pads 4, 4 are suspended by a hanger pin 9 mounted on a caliper body 3 in such a manner as to move in the axial direction of a disc. A pad spring 10 for pressing the friction pads 4, 4 is installed in an opening part 3b. An engaging part 10a engaged with the peripheral edge of the opening part 3b is formed on one end of the pad spring 10. The engaging part 10a is formed to have such a size that even if the disc outer peripheral side heights of the connecting parts 5b, 6b of the caliper main body are varied by accumulation of manufacturing allowance, tilting is not caused. Accordingly, the pad spring 10 is not tilted even if the height of the peripheral edge of the opeing part 3b is varied, so that the pressing part 10b can uniformly press a pair of friction pads 4, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake for a vehicle, and more particularly, to an arrangement structure of a pad spring in a disc brake for a vehicle having an opposed piston type caliper.

[0002]

2. Description of the Related Art In a disk brake for a vehicle, a pair of friction pads arranged on both sides of a disk rotor are pressed by a pad spring to prevent rattling of the friction pad during running or braking, thereby preventing generation of noise. In a disk brake for a vehicle having an opposed piston type caliper body in which a pair of caliper halves are opposed to each other to form a caliper body, as disclosed in Japanese Utility Model Publication No. 6-11368, for example, A plate-shaped pad spring is attached to an opening formed in the bridge portion of the present invention. The pad spring engages with the peripheral edge of the opening to screw the center engaging portion serving as a pressing fulcrum to the outer peripheral surface of the bridge portion of the pair of caliper halves, and presses the friction pad with the pressing portions at both ends. I have.

However, in such a structure, when a slight difference in height occurs between the outer peripheral surfaces of the bridge portions of the pair of calipers due to accumulation of manufacturing tolerances or the like, the height of the pressing fulcrum of the pad spring is reduced. The difference in the pressing force of the pressing portion due to the difference makes it impossible to uniformly press the pair of friction pads. For example, as shown in Japanese Patent Application Laid-Open No. 5-180250, two pad springs are stacked. There is one in which a pair of friction pads are separately pressed by each pressing portion.

[0004]

However, the production of a double pad spring requires a lot of work and is disadvantageous in terms of cost.

Therefore, the present invention can easily press the pair of friction pads even if it is easy to manufacture and even if there is a difference in the height of the periphery of the opening of the caliper body with which the engaging portion engages. It is an object of the present invention to provide a vehicle disk brake equipped with a pad spring.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a caliper body comprising a pair of caliper halves each having a cylinder hole facing each other and forming a caliper body. A disc brake for a vehicle in which a plate-shaped pad spring having an engaging portion engaging with the periphery of the opening portion and a pressing portion for pressing a friction pad is attached to an opening formed in the portion; The invention is characterized in that the engaging portion is engaged across the butting portion of the pair of caliper halves.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. FIGS. 1 to 4 show a first embodiment of the present invention, in which a vehicle disk brake 1 includes a disk rotor 2 rotating in the direction of arrow A, and a caliper disposed across the disk rotor 2. It is composed of a body 3 and a pair of friction pads 4, 4 arranged on both sides of the disk rotor 2.

The caliper body 3 is constituted by a pair of caliper halves 5 and 6 facing each other and joined together by four connecting bolts 7. The caliper half 5 is provided on the outer peripheral side of the disk of the action portion 5 a disposed on the side of the disk rotor 2 and at both ends in the disk circumferential direction, and is connected to the caliper half 6 by projecting toward the disk rotor 2. 5b, 5b, and the caliper half 6 is disposed on the outer peripheral side of the disk of the action portion 6a disposed on the side of the disk rotor 2 and at both ends in the disk circumferential direction.
A connecting portion 6b projecting in the direction to connect with the caliper half 5;
6b, the bridge portion 3a of the caliper body 3 is formed by connecting the one connecting portion 5b and the connecting portion 6b and the other connecting portion 5b and the connecting portion 6b so as to face each other. An opening 3b for mounting the friction pads 4 and 4 to the caliper body 3 is formed at the center of the bridge 3a.

In the caliper half 5, two cylinder holes 5c are formed in the action portion 5a in parallel, and the caliper half 6
Two cylinder holes 6c are formed in parallel in the action portion 6a, and the piston 8 is inserted into each of the cylinder holes 5c, 6c so as to be liquid-tight and movable.

The friction pad 4 includes a back plate 4a and a lining 4
b, and the friction pads 4, 4 inserted from the opening 3b penetrate through the opening 3b in the disk axial direction and attach the hanger pins 9 mounted on the caliper body 3 to the back plates 4a, 4b.
The disk 4a is inserted into the outer peripheral side of the disk, and is suspended by the caliper body 3 so as to be movable in the disk axial direction.

A pad spring 10 for pressing the friction pads 4 and 4 is mounted in the opening 3b. As shown in FIG. 4, the pad spring 10 is formed by stamping and bending a single thin metal plate, and has at one end an engaging portion 10a which engages with the periphery of the opening 3b and the other end. A pressing portion 10b for pressing the outer peripheral side of the disk of the back plates 4a, 4a of the friction pads 4, 4 abuts on an intermediate portion of the inner peripheral side of the hanger pin 9 with the engaging portion 10a and the pressing portion 10b. Abutment portion 10 for generating a biasing force in the inner circumferential direction of the disk at the same time
c are formed respectively. In addition, 10d, 10d, 10
Reference numerals e and 10e denote covers which cover the outer peripheral side of the friction pads 4 and 4 to prevent entry of mud and the like.

The engaging portion 10a engages across the outer peripheral surface of the disk at the abutting portion of the connecting portions 5b and 6b, which are the peripheral edges of the opening 3b in the disk circumferential direction. As shown in FIG. Even if the heights of the portions 5b and 6b on the outer peripheral side of the disk are different due to accumulation of manufacturing tolerances or the like, the portions are formed so as not to be inclined.

Therefore, the pad spring 10 does not tilt even if the height of the periphery of the opening 3b with which the engaging portion 10a engages is different due to accumulation of manufacturing tolerances and the like.
The pressing portion 10b can uniformly press the pair of friction pads 4 and 4. In addition, since one metal sheet is punched and bent, the manufacturing is easy.

FIGS. 5 to 8 show a second embodiment of the present invention. In the caliper body 20, a pair of caliper halves 21 and 22 are integrally connected by four connecting bolts 23. Friction pads 24, 24 are provided at the center of the bridge 20a.
Is formed in the caliper body 20 to form an opening 20b.

The friction pads 24, 24 are provided with the caliper half 2
1, a pad supporting portion 21a formed on the inner peripheral side of the disc,
The inner side of the disk of the back plate 24a is supported by a pad support portion (not shown) of the caliper half 22a and is mounted on the caliper body 20 so as to be movable in the disk axial direction.

The opening 20b has friction pads 24, 24
Is mounted. This pad spring 25, as shown in FIG.
A single thin metal plate is punched and bent, and presses the engaging portions 25a, 25a engaging with the peripheral edge of the opening 20b and the disk outer peripheral side of the back plates 24a, 24a of the friction pads 24, 24. The pad spring 25 has pressing portions 25b, 25b, and the engaging portions 25a, 25a are formed on the protrusions 20c, 20c formed at the center of the peripheral edge of the opening 20b in the disk circumferential direction from the disk inner peripheral side. The friction pads 24 are engaged with each other, are contracted between the back plates 24a of the friction pads 24, 24 and the outer peripheral side of the disk, and are attached to the openings 20b.

The projecting portion 20c is formed at the butting portion of the connecting portion 21b of the caliper half 21 and the connecting portion 22b of the caliper half 22, and the engaging portion 2 of the pad spring 25 is formed.
5a, as shown in FIG. 7, engages across the connecting portions 21b, 22b forming the convex portion 20c, and engages with the connecting portions 21b,
Even if the inner circumferential height of the disk 22b is different due to the accumulation of manufacturing tolerances or the like, it is formed in a size that does not cause inclination.

Accordingly, since the pad spring 25 does not tilt even if the height of the periphery of the opening 20b with which the engaging portion 25a engages is different due to accumulation of manufacturing tolerances, etc., the pressing portions 25b, 25b , A pair of friction pads 24,
24 can be pressed uniformly. In addition, since one metal sheet is punched and bent, the manufacturing is easy.

[0019]

As described above, the disc brake for a vehicle according to the present invention is formed in a bridge portion of a so-called split caliper body which constitutes a caliper body by opposing and abutting a pair of caliper halves. Since a pad spring having an engaging portion that is engaged across the butted portion of the pair of caliper halves is attached to the opening, there is a difference in the height of the opening portion peripheral edge of the caliper body with which the engaging portion is engaged. Even so,
The pair of friction pads can be pressed uniformly.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and shows II in FIG.
It is sectional drawing.

FIG. 2 is a plan view of the disk brake.

FIG. 3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is a perspective view of the pad spring.

FIG. 5 is a sectional view taken along line VV of FIG.
It is sectional drawing.

FIG. 6 is a plan view of the disk brake.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5;

FIG. 8 is a perspective view of the pad spring.

[Explanation of symbols]

1. Disc brakes for vehicles 2. Disc rotors
3, 20 ... caliper body, 3a, 20a ... bridge portion of caliper body 3, 3b, 20b ... caliper body 3
Openings, 4, 24 ... friction pads, 5, 6, 21, 22
... caliper half, 10, 25 ... pad spring, 10
a: engaging portion of pad spring 10, 10b: pressing portion of pad spring 10, 25a: pad spring 25
Engaging portion, 25b ... pressing portion of pad spring 25

Claims (1)

[Claims] 1. A caliper body comprising a pair of caliper halves each having a cylinder hole facing each other to form a caliper body. The caliper body is engaged with an opening formed in a bridge portion of the caliper body and a periphery of the opening. In a vehicle disc brake equipped with a plate-shaped pad spring having an engaging portion to be engaged and a pressing portion for pressing a friction pad, the engaging portion of the pad spring straddles the butting portion of the pair of caliper halves. A disc brake for a vehicle, wherein the disc brake is engaged.