JP2565874Y2 - Disc brakes for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake mounted on a vehicle such as an automobile or a motorcycle.

[0002]

2. Description of the Related Art As a disk brake for performing a braking action by moving a caliper body in a disk axial direction, there is one disclosed in, for example, JP-A-63-203933. The caliper body used in this disc brake has a working portion and a reaction portion disposed on both sides of the disc rotor connected by a bridge portion that straddles the outer periphery of the disc rotor, and is accommodated in a cylinder hole of the working portion. With the piston, the friction pad on the working part side is pressed against one side of the disk rotor, and the caliper body is moved toward the working part by this braking reaction force. Is pressed against the other side of the disk rotor.

[0003] The above-mentioned piston is formed in a ring shape, and the reaction force claw is formed in a bifurcated shape in which a central portion is cut out from the lower side. When these pistons and the reaction force claw press the friction pad,
Since each part only contacts a part of the back plate, warpage and uneven wear easily occur on the friction pad due to local pressing force, so the back plate was formed with a thickness that resists warpage and uneven wear .

[0004]

When the braking action is performed in such a configuration, the caliper body is opened in a C-shape around the bridge portion by the reaction force from the friction pad. Since the corner portion from the reaction claw to the bridge portion is thinner than other portions, it is necessary to minimize stress concentration.

For this reason, a countermeasure to increase the thickness of the reaction portion is conceivable. However, when the caliper body is mounted on the vehicle body, the wheel covers the outside of the reaction portion from the bridge portion to restrict the space. However, it was difficult to secure sufficient rigidity of the reaction portion.

Accordingly, the present invention provides a disk brake for a vehicle having a sufficient thickness for a reaction portion without increasing the size of the caliper body, and having sufficient rigidity for the opening force of the caliper body during braking. It is intended to be.

[0007]

In order to achieve the above object, a caliper of a disc brake for a vehicle according to the present invention comprises a cylinder for accommodating a piston in a working portion of a caliper body disposed on one side of a disc rotor. A hole is provided on each of the reaction portions provided on the other side of the disk rotor with reaction force claws, and a pair of friction pads are opposed to each other between the operation portion and the reaction portion with the disk rotor interposed therebetween. In the vehicle disc brake, the reaction claw has a pressing surface portion having a size that covers substantially the entire reaction portion-side friction pad,
In addition, the back plate of the reaction portion side friction pad is formed to be thinner than the back plate of the action portion side friction pad.

[0008]

According to the above construction, a space is created between the reaction force claw and the friction pad on the reaction portion side, and this space is used to cover the inside of the reaction force claw and the inside of the corner portion continuous from the reaction force claw to the bridge. Perform the overlay.

Alternatively, the length of the bridge portion is shortened by moving the entire reaction portion toward the disk rotor side by the space, so that the rigidity of the reaction portion is increased, and the opening force of the caliper body during braking is suppressed to a small value. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The disk brake 1 includes a disk rotor 2
On one side, a caliper body 4 is supported by a caliper bracket 3 fixed to the vehicle body via a slide pin 5 so as to be movable in the disk axial direction.

The caliper body 4 is configured such that an operating part piece 4a and a reaction part piece 4b, which are divided on both sides of the disk rotor 2, are connected to four connecting bolts 6 near one outer side of the disk rotor 2. These pieces are integrated with each other.
a and 4b can be cast by aluminum alloy or cast iron,
The sintered alloy is formed into a material.

The working portion side piece 4a is provided with a cylinder hole 4c opening toward the disk rotor 2, and the cup-shaped piston 7 is accommodated in the cylinder hole 4c. The reaction portion side piece 4b includes the entire bridge portion 4d straddling the outer periphery of the disk rotor 2 and a reaction portion 4f having a reaction force claw 4e. The reaction force claw 4e is a face plate having no irregularities on the inner surface side of the disk, that is, a so-called solid claw.
Alternatively, it has a size that covers substantially the entire surface of the back plate 9b.

Action part side piece 4a and reaction part side piece 4
b, a pair of friction pads 8 and 9 are opposed to each other with the disk rotor 2 interposed therebetween. Friction pads 8, 9
Is a lining 8 that is in sliding contact with the side surface of the disk rotor 2.
a, 9a and a back plate 8b held by the caliper body 4;
9b. A hydraulic chamber 10 is defined at the bottom of the cylinder hole 4c by accommodating the piston 7,
When the hydraulic pressure generated by a known hydraulic master cylinder (not shown) is supplied to the hydraulic chamber 10, the piston 7 advances through the cylinder hole 4c, and the tip 7a of the piston 7 8b, the lining 8a is pressed against one side of the disk rotor 2. Next, by this reaction, the caliper body 4 is moved in the direction of the working portion side piece 4a while being guided by the slide pin 5, and the reaction portion side piece 4b is moved.
The reaction force claw 4e presses the substantially entire surface of the back plate 9b of the friction pad 9 with the pressing surface portion 4g, and the lining 9a is pressed against the other side surface of the disk rotor 2 to perform a braking action.

Since the front plate 7b of the piston 7 abuts on a part of the back plate 8b of the working portion side friction pad 8 in a ring shape, warpage and uneven wear may occur due to a local pressing force on the friction pad 8. The thickness T1 is the same as that of the related art so as not to have the above. Also, the back plate 9b of the reaction portion side friction pad 9 has the pressing surface 4g of the reaction force claw 9b,
a or the back plate 9b is formed to have a size that covers substantially the entire surface, and the friction pad 9 is unlikely to act on an uneven load that causes warpage and uneven wear. Is formed thinner than the thickness T1 of the back plate 8b.

The reaction portion 4f uses the space formed between the back plate 9b and the back plate 9b to form the entire inner surface of the reaction force claw 4e and the reaction claw 4f. It is built up over the inner surface of the corner portion 4g continuous from 4e to the bridge portion 4d, and the portion is thicker than before. Due to this thickening, the rigidity of the reaction portion 4f, which was relatively thinner than the other portions in the past, is increased as a whole, and the caliper body 4 is opened in a C-shape around the bridge portion 4d as a fulcrum by the braking reaction force. Even if it is attempted, it can withstand this, and local concentration of load can be prevented as much as possible. In particular, since the thickness of the caliper body 4 is increased by using the space formed by making the back plate 9b of the reaction portion side friction pad 9 thinner, the entire length of the caliper body 4 can be maintained as it is. It is highly effective that the rigidity of the reaction portion 4f is increased as a whole while avoiding interference between the reaction portion 4f and the reaction portion side friction pad 9 while preventing warpage and uneven wear.

In the above-described embodiment, the rigidity is ensured by contacting the space formed by reducing the thickness of the back plate of the reaction portion-side friction pad with the build-up of the inner surface of the reaction portion. By moving the entire reaction portion toward the disk rotor side and shortening the length of the bridge portion as compared with the conventional case, the rigidity from the reaction portion to the bridge portion is increased, and the weight and size are reduced. You can also. Further, the type of the caliper body can be applied to an integral type other than the split type shown in the embodiment.

[0018]

As described above, according to the present invention, the pressing surface of the reaction force claw is formed to have a size substantially covering the friction pad on the reaction portion side, and the back plate of the reaction portion side friction pad is attached to the operation portion. By making the wall thinner than the back plate of the friction pad on the side, the reaction claw and the bridge from the reaction claw are connected to the bridge portion by utilizing the space formed between the reaction portion and the back plate of the friction pad. Since the inner surface of the corner can be overlaid, even if the caliper body receives an open load with the bridge as a fulcrum due to the braking reaction, the reaction section has sufficient rigidity to withstand this. can do. In particular, even though the reaction portion is overlaid, the entire length of the caliper body remains the same, so that interference between the caliper body and the wheel is avoided, and warpage and uneven wear of the reaction portion side friction pad are prevented. In addition, the effect is high in that the rigidity of the reaction portion is increased as a whole.

Further, by reducing the length of the bridge portion by moving the reaction portion toward the disk rotor side without increasing the size of the reaction portion, the weight and size of the caliper body can be reduced while securing the rigidity of the reaction portion. It is also possible to plan.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG.

FIG. 2 is a front view of the disc brake showing one embodiment of the present invention;

FIG. 3 is a partial cross-sectional rear view of FIG. 2;

FIG. 4 is a partial cross-sectional plan view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Bracket, 4 ... Caliper body, 4a ... Working part side piece,
4b: reaction portion side piece, 4c: cylinder hole, 4d: bridge portion, 4e: reaction force claw, 4f: reaction portion, 4g ... pressing surface portion, 4h ... corner portion, 7 ... piston, 8 ... friction pad on the action portion side , 8a ... lining of the friction pad 8, 8b
... the back plate of the friction pad 8, 9 ... the friction pad on the reaction portion side,
9a: lining of friction pad 9; 9b: friction pad 9
T1, thickness of the back plate 8b of the working portion side friction pad 8, T2: thickness of the back plate 9b of the reaction portion side friction pad 9

Claims (1)

(57) [Scope of request for utility model registration] An operating portion of a caliper body provided on one side of a disk rotor has a cylinder hole for accommodating a piston, and a reaction force claw is provided on a reaction portion provided on the other side of the disk rotor. In a vehicle disc brake, wherein a pair of friction pads are disposed opposite to each other with the disc rotor interposed between the action portion and the reaction portion, the reaction force claw covers substantially the entire surface of the reaction portion-side friction pad. A disc brake for a vehicle, comprising: a pressing surface portion having a size as described above; and a back plate of the reaction portion side friction pad is formed thinner than a back plate of the action portion side friction pad.