JPH0719267A - Disc brake for vehicle - Google Patents

Abstract

PURPOSE:To improve durability through prevention of thermal deterioration of a shim plate owing to a brake heat by a method wherein when a friction pad on the reaction part side is assembled to a caliper body, the drop of the shim plate is prevented from occurring and the shim plate is prevented from being left non-mounted. CONSTITUTION:A recessed groove 6n is formed radially of a disc throughout the inner surface of a reaction force claw 6f and the surface on the reaction part side of a ceiling opening part 12 connected flush with the outside thereof. Caliper mounting arms 15a and 15a are extended from the two side parts of a shim plate. When the half body 6a on the operation part side and the half body 6b on the reaction part side of a caliper body 6 are intercoupled through a coupling bolt 9, the caliper mounting arms 15a and 15a are nipped between butt surfaces 6i parted into the disc turning-in side and turning-out side. By inserting each coupling bolt 9 in the bolt insertion hole 15b of the caliper mounting arm 15a, the caliper mounting arms 15a and 15a are nipped between the butt surfaces 6i, and a shim plate 15 is attached to the caliper body 6.

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 mounted on a vehicle such as an automobile or a motorcycle, and more specifically, a reaction pad side of a floating type caliper body with a back surface of a back plate of a friction pad. The present invention relates to a mounting structure for a shim plate provided so as to cover it.

[0002]

2. Description of the Related Art In some disc brakes used in automobiles and motorcycles, a shim plate is attached to a friction pad to prevent a brake squeal during braking. This shim plate is made of a thin metal plate such as a stainless steel plate, and a plurality of locking claws bent to the outer edge are attached to the back surface of the back plate by sandwiching the side surface of the back plate and the inner and outer surfaces in the disk radial direction. Attached (eg, actual fair 5-16
415).

[0003]

In such a structure, the shim plate is easily detached from the friction pad, and when the friction pad is reassembled to the caliper body for maintenance or pad replacement, the shim plate is removed. You may forget to attach.

Therefore, the present invention is directed to the friction pad on the reaction portion side, which has a high brake squeal prevention effect by mounting the shim plate when the caliper body is a floating type that moves in the disc axial direction to perform a braking action. It is an object of the present invention to provide a vehicle disc brake in which the shim plate does not drop off from the friction pad or is not forgotten to be attached, and the heat deterioration of the shim plate is prevented to improve durability.

[0005]

In order to achieve the above object, in the first aspect of the present invention, the acting portion side half body and the reaction portion side half body, which are separately arranged on both sides of the disc rotor, are provided outside the disc rotor. The caliper body integrally abutted with each other is supported by a caliper bracket fixed to the vehicle body so as to be movable in the disc axial direction via a pair of slide pins, and the caliper body and the piston of the acting portion side half body In a vehicle disc brake in which a pair of friction pads are disposed between the reaction portion side half body and a reaction force claw with a disc rotor interposed therebetween, and a back plate rear surface of the reaction portion side friction pad is covered with a shim plate. The caliper mounting arm is integrally formed on the shim plate, and the caliper mounting arm is sandwiched between the abutting surfaces of the action part side half body and the reaction part side half body, and the shim plate is attached to the caliper body.

In the second invention, a gap for heat radiation is formed between the shim plate and the back plate and / or the reaction force claw, and in the third invention, the shim plate and the caliper mounting arm. A torque receiving piece is formed between the back side surface of the friction pad on the reaction portion side and the torque receiving surface of the caliper body that supports the back side surface during braking. To wear.

[0007]

According to each of the above configurations, the shim plate is always attached to the caliper body, and in the reaction unit side half body, only the friction pad is detached from the caliper body at the time of maintenance or pad replacement. When the friction pad of is attached to the caliper body, the shim plate is overlaid on the back surface of the back plate. In addition, the braking heat transmitted from the friction pad to the shim plate is quickly dispersed by the large area including the caliper mounting arm.

Furthermore, by forming a gap between the shim plate and the back plate and / or the reaction force claw, the braking heat transmitted to the shim plate is dissipated into the atmosphere in the gap. Further, the torque receiving piece formed between the shim plate and the caliper mounting arm prevents damage due to direct contact between the back plate side surface of the friction pad on the reaction portion side and the torque receiving surface of the caliper body.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of the present invention, in which a disc brake 1 is fixed to a vehicle body by a disc rotor 2 rotating in a direction of an arrow A and one side portion of the disc rotor 2. A caliper bracket 3, a caliper body 6 movably supported by the bracket 3 via a pair of slide pins 4 and 5 in the disc axial direction, a piston 7 of the caliper body 6 and a reaction force claw 6f. And a pair of friction pads 8 which are opposed to each other with the disc rotor 2 interposed therebetween.

In the caliper body 6, the action portion side half body 6a and the reaction portion side half body 6b, which are separately arranged on both sides of the disc rotor 2, are screwed into the disc turn-in and turn-out sides in the disc axial direction. The action portion side half body 6a is connected by four connecting bolts 9, and the action portion 6c is held by the above-mentioned slide pins 4 and 5 on one side portion of the disc rotor 2.
And a bridge portion 6e that straddles the outer circumference of the disk rotor 2 are integrally formed, and the reaction portion side half body 6b is the reaction portion 6d as a whole.

A cylinder hole 10 is provided in the center of the action portion 6c so as to open toward the disk rotor 2 side, and the piston 7 is housed in the cylinder hole 10 in a liquid-tight and movable manner. The hydraulic chamber 1 is provided between the bottom walls of the holes 10.
1 is defined, and the above-mentioned reaction force claw 6f is provided facing the piston 7 at the center of the reaction portion 6d.

A rectangular ceiling opening 12 is formed through the central portion of the bridge portion 6e.
8 is a hanger pin 1 suspended in the ceiling opening 12.
3 and 13 are movably suspended in the disc axial direction, and are also repelled inward in the disc radial direction by a pad spring 14 which is contracted between the hanger pins 13 and 13. . Each friction pad 8 is composed of a lining 8a that is in sliding contact with the side surface of the disc rotor 2 and a back plate 8b whose upper portion is held by the above-mentioned hanger pins 13 and 13. The friction pad 8 on the action portion side is The back plate 8b is housed in the pad mounting recess 3a of the caliper bracket 3, and the friction pad 8 on the reaction portion side has a torque receiving protrusion formed by the back plate 8b protruding from the inner surface of the reaction portion 6d with the reaction force claw 6f interposed therebetween. 6g,
It is housed between 6g.

Four concave grooves 6h are formed in the disk radial direction on the inner surface of the reaction force claw 6f and on the side surface of the reaction portion of the ceiling opening 12 which is flush with the outside of the reaction force claw 6f.
A shim plate 15 made of metal is provided between and the friction pad 8 on the reaction part side so as to cover the back surface of the back plate 8b. The shim plate 15 is formed to be slightly larger than the lining 8a, and has caliper mounting arms 15a, 15a having the same shape as the abutting surfaces 6i of the acting portion side half body 6a and the reaction portion side half body 6b on both upper side portions thereof. However, the caliper mounting arm 15a is provided so as to extend flush with the shim 15, and bolt insertion holes 15b and 15b are formed in each caliper mounting arm 15a.

The caliper mounting arms 15a and 15a are abutting surfaces which are divided into a disc entry side and a delivery side when the action portion side half body 6a and the reaction portion side half body 6b are connected by a connecting bolt 9. 6i, and bolt insertion hole 15b
A connecting bolt 9 for connecting the two halves 6a, 6b is inserted into each of the two, and by screwing the connecting bolt 9,
The caliper mounting arms 15a, 15a are sandwiched by the abutting surface 6i, and the shim plate 15 is integrally mounted on the caliper body 6. By this attachment, the outer surface of the shim plate 15 comes into close contact with the back surface of the back plate 8b of the friction pad 8, the inner surface comes into close contact with the inner surface of the reaction force pawl 6f, and the groove 6h is formed.
Is closed by the shim plate 15, and a gap 16 in the disk radial direction is defined between the shim plate 15 and the reaction force claw 6f.

The shim plate 15 of the present embodiment is sandwiched between the abutting surfaces 6i of the action portion side half body 6a and the reaction portion side half body 6b of the caliper body 6 as described above, and the shim plate 15 on the reaction portion side. When the friction pad 8 is assembled to the caliper body 6,
The shim plate 15 covers the back surface of the back plate 8b to effectively prevent brake squeal. The friction pad 8 on the reaction portion side is separately attached and detached with the shim plate 15 left in the caliper body 6 at the time of maintenance or pad replacement. Therefore, when the friction pad 8 is reassembled to the caliper body 6, Problems such as forgetting to attach or dropping out during assembly disappear.

Further, the braking heat generated in the friction pad 8 on the reaction portion side by the sliding contact with the disc rotor 2 is transmitted to the shim plate 15 contacting the back plate 8b. While being dispersed over a wide area including the caliper mounting arms 15a, 15a, the shim plate 15 is cooled because it is rapidly released into the atmosphere in the gap 16 defined between the caliper mounting arms 15a and 15a. It is highly efficient and has excellent durability with little deterioration due to heat.

6 and 7 show a second embodiment of the present invention. The caliper body 6 is provided with a pad mounting recess 6j on the inner surface of the reaction claw 6f, and the pad mounting recess 6j is formed.
In addition, the back plate 8b of the friction pad 8 on the reaction part side is the shim plate 1
5, and a plurality of protrusions or protrusions 8c are provided on the back surface of the back plate 8b by half piercing.

Further, strip-shaped torque receiving pieces 15c are bent on both sides of the shim plate 15, and caliper mounting arms 15a similar to those of the first embodiment are attached to the outer edges of the torque receiving pieces 15c. It extends parallel to the plate 15. The caliper mounting arms 15a, 15a are sandwiched between the abutting surfaces 6i of the acting portion side half body 6a and the reaction portion side half body 6b,
While being sandwiched by the connecting bolts 9, the U-shaped portions of the shim plate 15 and the torque receiving pieces 15c, 15c are arranged in the pad mounting recess 6j.

The shim plate 15 is disposed between the inner surface of the pad mounting recess 6j and the projection or the ridge 8c of the back plate 8b, and a gap 20 is defined between the shim plate 15 and the back plate 8b. In addition, each torque receiving piece 15c is provided in close contact between the torque receiving surface 6k on the side surface of the pad mounting recess 6j and the side surface 8d of the back plate 8b.

In addition to the effects of the first embodiment, this embodiment
When the friction pad 8 on the reaction portion side moves in the disc squeezing direction during braking, the torque receiving piece 15c integrally formed with the shim plate 15 supports the side surface 8d of the back plate 8b and the torque receiving surface 6k. In order to avoid contact with the reaction part side half body 6b, damage to the torque receiving surface 6k can be prevented, especially when the reaction part side half body 6b is formed of a soft material such as an aluminum alloy.
The durability of b can be improved.

8 and 9 show the third and third aspects of the present invention, respectively.
FIG. 10 shows a fourth embodiment, both of which are shown in FIG.
The shim plate 15 shown in is commonly used. This shim board 1
In Fig. 5, a plurality of trapezoids are folded back inward and outward,
A groove 15d is formed on the inner surface side and a groove 15e is formed on the outer surface side in the disk radial direction. At both sides of the shim plate 15, a torque receiving piece 15c and a caliper mounting arm similar to those of the second embodiment are formed. 15a and 15a are extended.

In the third embodiment of FIG. 8, a pad mounting recess 6j is provided on the inner surface of the reaction force claw 6f, and the pad mounting recess 6 is formed.
Four projections or protrusions 8c are provided in the disk radial direction by half piercing on the back surface of the back plate 8b of the reaction portion side friction pad 8 housed in j. Each protrusion or ridge 8c is housed in a groove 15d on the inner surface side of the shim plate 15, and a plurality of gaps 30 are defined between the reaction force claw 6f and the shim plate 15 in the disc radial direction. .

Further, in the fourth embodiment shown in FIG. 9, three protrusions 6m are formed on the inner surface of the reaction force claw 6f in the disk radial direction. The shim plate 15 accommodates the protrusion 6m of the reaction force claw 6f in the recessed groove 15e on the outer surface side, and the inner surface is brought into close contact with the back surface of the back plate 8b of the reaction portion side friction pad 8 so that the shim plate 15 and the back plate 8b are in contact with each other. A gap 40 is defined.

In each of the above-mentioned embodiments, the caliper mounting arm integrally formed with the shim plate is described as having the same shape as the abutting surfaces of the two halves, but only a part of the abutting surfaces has a size. But it doesn't matter.

Further, in each of the embodiments, since the ceiling opening portion is provided at the center of the bridge portion, the caliper mounting arms are extended to both side portions of the shim plate, and both sides of the abutment surfaces of the halves are connected to the disc entry and exit sides. In the case of the caliper body which is sandwiched but does not have the ceiling opening, the caliper mounting arm may be extended to the outside of the shim plate in the disk radial direction. Further, the heat radiation gap may be provided both on the back plate of the friction pad and on the reaction force claw.

[0027]

According to the disc brake for a vehicle of the present invention, a caliper mounting arm is integrally formed on a shim plate which covers the back plate rear surface of the reaction portion side friction pad, and the caliper mounting arm is formed on the working portion side half body of the caliper body. Since the shim plate is attached to the caliper body by sandwiching the shim plate on the butting surface of the reaction part side half body, the friction pad on the reaction part side can be attached and detached as a single item, leaving the shim plate in the caliper body for maintenance and pad replacement. Therefore, when reassembling the friction pad to the caliper body, it is possible to eliminate problems such as forgetting to attach the shim plate or dropping the shim plate during the assembling. Further, the braking heat transmitted from the friction pad on the reaction portion side is dispersed over a wide area including the caliper mounting arm, so that the heat radiation effect is high and the heat deterioration of the shim plate is small.

Further, by forming a gap between the shim plate and the back plate and / or the reaction force claw, the braking heat of the shim plate is
Since it can be diffused into the air in the gap, the durability of the shim plate is enhanced.

Further, a torque receiving piece is formed between the shim plate and the caliper mounting arm, and the torque receiving piece is supported by the back plate side surface of the friction pad on the reaction portion side and the back plate side surface during braking. By interposing it between the torque receiving surface of the caliper body, the torque receiving piece of the shim plate can be
Since the side surface of the back plate is supported to prevent the torque receiving surface from being damaged, durability can be enhanced especially when the caliper body is formed of a soft material such as an aluminum alloy.

[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 front view of the disc brake showing the first embodiment of the present invention.

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

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view of a shim plate used in the first embodiment of the present invention.

FIG. 6 is a cross-sectional plan view of essential parts of a disc brake showing a second embodiment of the present invention.

FIG. 7 is a perspective view of a shim plate used in the second embodiment of the present invention.

FIG. 8 is a cross-sectional plan view of essential parts of a disc brake showing a third embodiment of the present invention.

FIG. 9 is a cross-sectional plan view of essential parts of a disc brake showing a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a shim plate commonly used in the third and fourth embodiments of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 4, 5 ... Slide pin 6 ... Caliper body 6a ... Working part side half of caliper body 6b ... Reaction part side half body of caliper body 6c ... Caliper body 6 Action portion 6d ... Reaction portion of caliper body 6e ... Bridge portion of caliper body 6f ... Reaction force claw formed on reaction portion 6e 6g ... Torque receiving projection 6h ... Concave groove 6i ... Reaction portion half of reaction portion 6a Butt face 6j of the side half 6b ... Pad mounting recess 6k formed on reaction force claw 6f 6 ... Torque receiving face on the side of torque receiving recess 6j 6m ... ... Friction pad 8a ... Lining of friction pad 8 8b ... Back plate 8c of friction pad 8 ... Protrusion protruding on back plate 8b of reaction portion side friction pad 8 8d ... Reaction The protruding ridge 9 of the back plate 8b of the part side friction pad 8 ... The connecting bolt connecting the acting part side half body 6a and the reaction part side half body 6b 10 ... Cylinder hole 12 ... Ceiling opening 13 ... Hanger pin 15 ... Reaction Shim plate 15a provided so as to cover the back surface of the back plate 8b of the friction pad 8 on the side of the section. ... Torque receiving piece 15d provided between the shim plate 15 and the caliper mounting arm 15a ... Recessed groove formed on the inner surface side of the shim plate 15e ... Recessed groove formed on the outer surface side of the shim plate 15, , 40 ... Gap A ... Rotation direction of disk rotor 2

Claims (3)

[Claims] 1. A caliper body in which an action part side half body and a reaction part side half body, which are separately arranged on both sides of a disk rotor, are butted against each other on the outside of the disk rotor and integrally connected, is fixed to a vehicle body. The movable caliper bracket is movably supported in the disc axial direction via a pair of slide pins, and a pair of frictions are provided between the piston of the acting portion side half body and the reaction force claw of the reaction portion side half body. In a vehicle disc brake in which pads are arranged with a disc rotor sandwiched between them, and a back plate rear surface of a friction pad on the reaction portion side is covered with a shim plate, a caliper mounting arm is integrally formed on the shim plate, and the caliper mounting arm is formed. A disc brake for a vehicle, wherein the shim plate is attached to a caliper body by sandwiching the shim plate between the acting portion side half body and the reaction portion side half body. 2. The disc brake for a vehicle according to claim 1, wherein a gap is formed between the shim plate and the back plate and / or the reaction claw. 3. A torque receiving piece is formed between the shim plate and the caliper mounting arm, and the torque receiving piece is formed between the back plate side surface of the friction pad on the reaction portion side and the back plate side surface during braking. The vehicle disc brake according to claim 1 or 2, wherein the caliper body is supported between the caliper body and the torque receiving surface.