JPH0821463A - Disc brake for vehicle - Google Patents

Abstract

PURPOSE:To sufficiently develop the function of a pad retainer by exceedingly preventing the interference between a frictional pad and a pad retainer by installing the pad retainer in a shiftable manner in the disc radial direction and the disc axis direction by a screw means. CONSTITUTION:Since the boss part 2f of a retainer installation hole 14 is projected higher than the plate thickness of the installation piece 13c of a pad retainer 13, the pad retainer 13 can shift the gap portion which is generated by subtracting the thickness of the installation piece 13c from the boss part 2f towards the disc axis direction. Since the through hole 13d of the installation piece 13c has the larger diameter than the boss part 2f, the pad retainer 13 can shift the gap of the large diameter portion of the through hole 13d in the disc radial direction. Accordingly, each pad retainer 13 is prevented from being applied with the forcible tightening of a fitting screw 18, and installed in a shiftable state in the disc axis direction and the disc radial direction, the deformation of the pad retainer 13 and the fixation in a tilt state can be prevented, even if error exists at the working position of a female screw hole 15.

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 in vehicles such as automobiles and motorcycles, and more particularly, to mounting a pad retainer for guiding a friction pad in the disc axial direction on a torque receiving surface of a caliper body. Regarding

[0002]

2. Description of the Related Art For example, a disc brake in which a pad retainer is laid on the torque receiving surface of a caliper body that supports a friction pad during braking so that the friction pad is guided in the disc axial direction by, for example, actual opening. Sho 6
There are those disclosed in JP-A-2-136638 and JP-A-63-135623.

In these disc brakes, the working portions of the caliper body connected by the bridge portion are arranged on both sides of the disc rotor, and the torque receiving surfaces of the working portions of the working portions face the entry side and the exit side of the disc. Forming a pad mounting recess between both torque receiving surfaces, arranging a friction pad in each pad mounting recess, laying a pad retainer on each torque receiving surface, and braking with the pad retainer. While guiding the friction pad in the direction of the disc axis,
The braking torque from the friction pad is supported between itself and the torque receiving surface.

The pad retainer includes a separate type which is independently mounted on each of the four torque receiving surfaces,
There is an integral type in which two adjacent discs are sandwiched between the disc entry and exit sides with the disc rotor sandwiched between them. The former disc brake shows an integral pad retainer. A typical pad retainer, such as the former pad retainer, is formed of a thin metal plate such as a stainless steel plate, and a plurality of locking claws protruding from the side edges are elastically locked at appropriate places on the caliper body. Mounted on the body.

By the way, in recent disc brakes,
It is known to use a lightweight aluminum alloy for the caliper body to reduce the weight of the vehicle body and reduce the unsprung load.
Since the back plate of the friction pad is made of a steel plate that is harder than aluminum alloy, if you repeatedly use the former disc brake in a race etc., excessive braking torque from the friction pad will occur.
The torque receiving surface of the caliper body is applied to the caliper body through the thin pad retainer, which causes inconveniences such as indentations on the soft torque receiving surface and deformation of the pad retainer.

Therefore, it is conceivable to form the pad retainer to a thickness that can withstand deformation even when a large braking torque is applied from the friction pad. However, in the thick plate pad retainer, the locking claws are made to have elastic force. Since it is difficult to assemble it to the caliper, the latter disc brake pad retainer has a mounting piece that extends on each pad retainer and is evenly attached to the two surfaces, the disc circumferential direction and the disc axial direction. It is fixed with a set screw to the retainer mounting surface of the caliper body that tilts at an angle.

[0007]

However, when fixing the pad retainer with a set screw, if there is a manufacturing error in processing on the caliper body side such as the processing position of the female screw hole for screwing, the set screw will be damaged. The pad retainer may be distorted by tightening and fixing, or the pad retainer may be inclined and fixed without being brought into close contact with the torque receiving surface. And
Part of the pad retainer protrudes into the pad mounting recess to restrict the space between the pad mounting recesses, causing the friction pad and the pad retainer to interfere with each other and hindering the movement of the friction pad that moves in the disc axial direction during braking. When the brake is released, the friction pad cannot be fully pulled back from the disc rotor, which may cause uneven wear of the lining and dragging noise.These problems are noticeable in the integrated type with a long mounting span. Was there.

Therefore, the present invention can prevent the friction between the friction pad and the pad retainer as much as possible, regardless of the thickness of the pad retainer and the material of the caliper body, and can fully exert the function of the pad retainer. Intended to provide brakes.

[0009]

In order to achieve the above-mentioned object, a first aspect of the present invention is to dispose both working portions of a caliper body connected to a bridge portion on both sides of a disc rotor, and to disc the respective working portions. A friction pad is provided between the torque receiving surfaces provided on the inflow side and the outflow side, and the torque transmitting surface of the friction pad is supported on each of the torque receiving surfaces. In a vehicle disc brake in which a pad retainer that guides the disc in the disc axial direction is laid, the pad retainer is attached to the caliper body by a screw means so as to be movable in the disc radial direction and the disc axial direction.

According to the second aspect of the invention, both working portions of the caliper body connected to the bridge portion are arranged on both sides of the disc rotor, and the working portions of the caliper body are provided so as to face the disc entry side and the entry side. A vehicle in which a friction pad is disposed between the torque receiving surfaces, and a pad retainer that supports the torque transmitting surface of the friction pad and guides the friction pad in the disc axial direction is laid on each of the torque receiving surfaces. In the disc brake for vehicle, two pad retainers facing each other with the disc rotor interposed therebetween are connected across the outer side of the disc rotor, and at least one of the connected pad retainers is attached to the caliper body with a disc radius by a screw means. Mounted so that it can move in the direction of the disk and the disk axis.

[0011]

According to this structure, the pad retainer is attached in a floating state in the disk axial direction and the disk radial direction, including manufacturing errors such as the pad retainer, the torque receiving surface, and the pitch of the female screw hole. Since the pad retainer is not subjected to the forced tightening of the set screw, the free shape of the pad retainer that has been formed is not deformed by a manufacturing error or is fixed by being tilted. And
If a part of the pad retainer protrudes into the pad mounting recess, the protruding part of the pad retainer is pushed outward by the friction pad assembled in the pad mounting recess, and the pad retainer keeps its free shape by molding. As it is, the torque receiving piece is corrected to a regular position where it is in close contact with the torque receiving surface.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on.

The caliper body 2 used for the disc brake 1 has two large and small caliper halves 2a and 2b, which are divided from the outer central portion of the disc rotor 3 rotating in the direction of arrow A, to the disc rotor side. It is a 4-pot piston facing type in which cylinder holes 4 and 5 are provided so as to face each other, and cylindrical pistons 6 and 7 having a bottom are inserted in the cylinder holes 4 and 5 so as to be liquid-tight and movable. , 2b
Are integrally connected by screwing six connecting bolts 8, 8 on the disc turn-in and turn-out sides of the bridge portion 2c, and the disc turn-in and turn-out sides of one caliper half 2a are connected to the discs. Mounting bolts are inserted into the vehicle body mounting holes 2d, 2d that are formed through the radial direction, and are screwed and fixed to the vehicle body.

Pad mounting recesses 9 are formed on the front surfaces of the cylinder holes 4 and 5 adjacent to each other on each side of the disk rotor 3. 2e, 2e, and friction pads 10 are provided in the pad mounting recesses 9, respectively. The friction pad 10 includes a lining 11 and a back plate 12, and ear pieces 12 projecting from both sides of the back plate 12.
The a and 12a are locked to the pad receiving pieces 13b of the pad retainer 13 laid on the torque receiving surfaces 2e and 2e and supported so as to be movable in the disc axial direction. The braking torque generated in the friction pad 10 by the sliding contact with is supported by the torque receiving surface 2e via the pad retainer 13.

On both sides of the pad mounting recess 9, rectangular retainer mounting holes 14, 14 are recesses shallower than the pad mounting recess 9 and are formed continuously with the torque receiving surfaces 2e, 2e. Each retainer mounting hole 14 has a small diameter boss 2
f protrudes higher than the thickness of a mounting piece 13d of a pad retainer 13 described later, and a female screw hole 15 is formed from the boss portion 2f to the inside of the caliper halves 2a and 2b. There is.

At the center of the bridge portion 2c, a horizontal rectangular ceiling opening 16 that is long in the disc circumferential direction is formed in a size that connects the four torque receiving surfaces 2e, and the friction pad 10 of the pad mounting recess 9 is A strength member 17 that is inserted and removed through the ceiling opening 16 and is installed in the center of the ceiling opening 16 so as to straddle the outside of the disk rotor 3.
Prevents the disc from falling out.

The pad retainer 13 is a separate type provided individually on each of the four torque receiving surfaces 2e of the caliper body 2, and is continuous from the torque receiving surface 2e to the disk entrance side or the exit side surface of the ceiling opening 16. A torque receiving piece 13a, a pad receiving piece 13b that projects from the inner end of the torque receiving piece 13a on the radial side of the disk toward the pad mounting recess 9 side, and supports the ear piece 12a of the friction pad 10, and the torque. The pad piece 13b, which is formed by cutting out one side portion of the receiving piece 13a and is bent in the opposite direction, is formed by bending a thin plate or a thick plate such as a stainless steel plate having a relatively smooth surface.

The outer side of the torque receiving piece 13a in the radial direction of the disk is tapered outward in conformity with the shape of the opening of the ceiling opening 16 on the disk entry side or the exit side, and the friction pad 10 is fixed to the ceiling. The pad 16 can be easily inserted from the opening 16 into the pad mounting recess 9. Further, the mounting piece 13c has a through hole 13d and a retainer mounting hole 1
4 has a larger diameter than the boss 2f and has a set screw 1 described later.
8 is smaller in diameter than the head portion of the pad retainer 8, and the pad retainer 13 loosely fits the through hole 13d into the boss portion 2f,
The mounting piece 13c is housed in the retainer mounting hole 14, and the torque receiving piece 13a is attached to the torque receiving surface 2e and the ceiling opening 16.
While continuously laying on the disk entry side or the exit side of the set, the male screw 18b of the set screw 18 is screwed into the female screw hole 15 of the boss portion 2f, and the set screw 18 is attached to the tip surface of the boss portion 2f.
The heads 18a are closely attached to each other and the attachment pieces 13c are prevented from coming off, so that they can be attached to the caliper halves 2a and 2b without coming off.

Since the boss portion 2f of the retainer mounting hole 14 is projected higher than the plate thickness of the mounting piece 13c of the pad retainer 13 as described above, the pad retainer 13 is formed.
However, the boss portion 2f can be moved in the disc axial direction by a gap obtained by subtracting the thickness of the mounting piece 13c, and the through hole 13d of the mounting piece 13c has a larger diameter than the boss portion 2f. Since it is a hole, the pad retainer 13 can also move in the radial direction of the disk through the large-diameter gap of the through hole 13d.

In this way, each pad retainer 13 is mounted in a floating state so as to be movable in the disc axial direction and the disc radial direction without being forcibly tightened by the set screw 18. Even if there is a manufacturing error in the processing position and the like, the free shape of the pad retainer 13 that has been formed is not deformed or fixed by being tilted. However, depending on the position of the center of gravity of the pad retainer 13, the torque receiving piece 13a may be separated from the torque receiving surface 2e, the entire pad retainer 13 may be tilted, etc. Although it may project to the mounting recessed portion 9, when the friction pad 10 is mounted to the pad mounting portion 9, the protruding portion of the pad retainer 13 is pushed outward by the friction pad 10, and the pad retainer 13 causes the torque receiving piece 13a to generate the torque. It is corrected to a regular mounting position that is in close contact with the receiving surface 2e.

As a result, the pad retainer 13 can be clamped and fixed in a deformed state as in the conventional case, and the space between the pad mounting recesses 9 is not narrowly restricted.
The interference between 0 and the pad retainer 13 is prevented. Therefore, the friction pad 10 at the time of braking can be guided well in the disc axial direction, and the friction pad 1 at the time of releasing the braking can be obtained.
Since 0 can be sufficiently pulled back from the disc rotor 3, the lining 11 is not unevenly worn or an unpleasant dragging noise is not generated, and the friction pad 10 can be easily replaced.

FIGS. 5 to 8 show a second embodiment of the present invention. The pad retainer 20 used in this embodiment is arranged to face the disc turn-in side or the turn-out side with the disc rotor 3 in between. Pair of pad retainers 20a, 20a
Are connected by a connecting piece 20b to form an integral type.

Each pad retainer portion 20a is provided with a torque receiving piece 20c, a pad receiving piece 20d, and a mounting piece 20e having a through hole 20f, which is provided in substantially the same manner as the pad retainer 13 of the first embodiment. Both torque receiving pieces 2
0c, 20c one side edge upper part, both torque receiving pieces 20c,
It is connected to 20c by a connecting piece 20b that is flush with the surface. The boss portion 2f of the retainer mounting hole 14 is formed only in one caliper half 2a on the vehicle body mounting side, and the female screw hole 15 is directly drilled in the retainer mounting hole 14 of the other caliper half 2b. There is.

The integrated pad retainer 20 of this embodiment is
The connecting piece 20b is laid along the disk entrance side or the exit side surface of the ceiling opening 16 so as to straddle the outside of the disk rotor 3, and one pad retainer section 20a is mounted on the vehicle body on one caliper half. 2a retainer mounting hole 14
In the same manner as the first embodiment, the set screw 18 is attached so as to be movable in the disc axial direction and the disc radial direction.
The other pad retainer portion 20a is fastened and fixed to the retainer mounting hole 14 of the caliper half 2a with a set screw 18.

In the above-described mounting, one of the pad retainers 20a, 20a of the integrated pad retainer 20 is fixed, but the other is held in a floating state where the set screw 18 is not forcibly tightened. There is no deformation in the free shape of the retainer 20. In particular, since one of the pad retainers 20a, 20a is fixed by tightening with the set screw 18, in addition to the effect of the first embodiment, the integrated pad retainer 20 can be attached to the regular position without inclination. In addition, due to the vibration of the vehicle, the integrated pad retainer 20
Will not rattle. As a modified example of the second embodiment, both pad retainer portions 20a, 20a of the integrated pad retainer 20 may be mounted in a floating state.

In the third embodiment shown in FIGS. 9 and 10, the same separate type pad retainer 13 as in the first embodiment is used, and from the retainer mounting hole 14 of the caliper body 2 to the first and second embodiments. Instead of omitting the boss portion 2f, the pad retainer 13 is attached using a separate retainer holder 30.

The retainer holder 30 has a rectangular flange 30a having substantially the same area as the retainer mounting hole 14, a cylindrical boss having a smaller diameter than the through hole 13d of the pad retainer 13 and longer than the mounting piece 13c of the pad retainer 13. And a through hole 30c is formed therethrough. The pad retainer 13 has a flange 30.
A mounting piece 13c is loosely fitted to the boss portion 30b of the retainer holder 30 in which a is brought into close contact with the bottom wall of the retainer mounting hole 14.
From the through hole 30c of the retainer holder 30, the male screw 18b of the retainer mounting hole 14 to the male screw 18b of the set screw 18.
The head portion 18a of the set screw 18 into the boss portion 30.
It is brought into contact with the tip surface of b and is prevented from coming off by the head portion 18a.

A mounting piece 13c of the pad retainer 13,
Flange 30a of retainer holder 30 or set screw 1
8 has a gap between it and the head portion 18a, and also between the mounting piece 13c and the boss portion 30b of the retainer holder 30, there is a gap between the pad retainer 13 and the set screw 18. It is mounted with a margin to allow these gaps to move in the disc axial direction and the disc radial direction without receiving them.

In the fourth embodiment shown in FIGS. 11 and 12,
A stepped screw 40 having a large diameter portion 40c at the base end of the male screw 40b is used. The head 40a of the stepped screw 40 is larger than the through hole 13d of the mounting piece 13c of the pad retainer 13, and the large diameter portion 40c is smaller than the through hole 13d and longer than the mounting piece 13c. In the pad retainer 13, the flange 30a is loosely fitted to the large diameter portion 40c of the stepped screw 40, the male screw 40b of the screw 40 is inserted into the female screw hole 15 of the retainer mounting hole 14, and the tip of the large diameter portion 40c is retained. It is screwed in until it comes into contact with the bottom wall of the mounting hole 14, and is prevented from coming off by the head portion 40a, so that it can be mounted with an allowance for movement in the disc axial direction and the disc radial direction.

In the screw means of the present invention, as shown in each of the above-mentioned embodiments, the pad retainer may be prevented from coming off while allowing it to move in the disc axial direction and the disc radial direction. It does not matter depending on the form.

[0031]

In the vehicle disc brake of the present invention, since the pad retainer is attached by the screw means so as to be movable in the disc radial direction and the disc axial direction, there is a manufacturing error in the machining position of the female screw hole or the like. However, the pad retainer can be attached to the proper position without being deformed or fixed by being inclined. As a result, the pad retainer is not clamped and fixed in a deformed state as in the conventional case, and the gap between the pad mounting recesses is not restricted so that the friction pad and the pad retainer are prevented from interfering with each other. This will allow good guidance in the disc axis direction. Further, since the friction pad at the time of releasing the braking can be sufficiently pulled back from the disc rotor, uneven wear of the lining and unpleasant dragging noise are prevented, and the friction pad can be easily replaced. Further, in the present invention, the pad retainer can be used for both thin and thick plates, and the material of the caliper body is not selected.

[Brief description of drawings]

FIG. 1 is a partially sectional plan view of a disc brake showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

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

FIG. 4 is an exploded perspective view of essential parts of the disc brake according to the first embodiment of the present invention.

FIG. 5 is a partially sectional plan view of a disc brake showing a second embodiment of the present invention.

6 is a sectional view taken along line VI-VI of FIG.

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

FIG. 8 is a perspective view of a pad retainer used in a second embodiment of the present invention.

FIG. 9 is a sectional view of an essential part of a disc brake showing a third embodiment of the present invention.

FIG. 10 is an exploded perspective view of essential parts of a disc brake showing a third embodiment of the present invention.

FIG. 11 is a sectional view of a main part of a disc brake showing a fourth embodiment of the present invention.

FIG. 12 is an exploded perspective view of essential parts of a disc brake showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1 ... Disc brake 2 ... Caliper body 2a, 2b ... Caliper half 2c ... Bridge portion 2e ... Torque receiving surface 2f ... Boss portion 3 ... Disc rotor 9 ... Pad mounting recess 10 ... Friction pad 11 ... Lining 12 ... Back plate 13 ... Separate type pad retainer 13a ... torque receiving piece 13b ... pad receiving piece 13c ... mounting piece 13d ... through hole 14 ... retainer mounting hole 15 ... female screw hole 16 ... ceiling opening 18 ... set screw 18a ... head 18b ... male thread 20 ... Integrated pad retainer 20a ... Pad retainer portion 20b ... Connecting piece 20c ... Torque receiving piece 20d ... Pad receiving piece 20e ... Mounting piece 20f ... Through hole 30 ... Retainer holder 30a ... Flange 30b ... Boss portion 30c ... Through hole 40 ... Stepped screw 40a ... Head 40b ... Male thread 40c ... Large diameter part

Claims (2)

[Claims] 1. A torque receiving surface provided with both working portions of a caliper body connected to a bridge portion on both sides of a disc rotor, and facing each other on the disc turn-in side and turn-out side of each action portion. A disc brake for a vehicle, in which a friction pad is disposed between the friction pads and a torque transmitting surface of the friction pad is supported on each of the torque receiving surfaces to lay a pad retainer for guiding the friction pad in the disc axial direction. A disc brake for a vehicle, wherein the pad retainer is attached to the caliper body so as to be movable in a disc radial direction and a disc axial direction by a screw means. 2. A torque receiving surface provided with both working portions of a caliper body connected to a bridge portion on both sides of a disc rotor, and facing the disc entry side and delivery side of each action portion. A disc brake for a vehicle, in which a friction pad is disposed between the friction pads and a torque transmitting surface of the friction pad is supported on each of the torque receiving surfaces to lay a pad retainer for guiding the friction pad in the disc axial direction. , Two pad retainers facing each other across the disc rotor are connected across the outside of the disc rotor, and at least one of the connected pad retainers is screwed to the caliper body in the disc radial direction and the disc shaft. A disc brake for vehicles, which is mounted so that it can move in any direction.