KR19980036909A - Brake shoe with drum brake - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake shoe having a stopper in a brake shoe of a drum brake system of a motor vehicle, in which a swing range can be limited, and having a diameter larger than the diameter of the support portion 6a of the piston 6 of the wheel cylinder 3. It is characterized by including a cylindrical stopper (7), by which the support (6a) of the piston (6) is accommodated in the stopper (7), thereby limiting the swing range.

Description

Brake shoe with drum brake

1 is an exploded perspective view showing a brake system of an automobile.

2 is a perspective view showing a support structure of a brake shoe by a conventional cylinder.

3 is a perspective view showing a support structure of a brake shoe by a cylinder according to the present invention.

* Description of the symbols for the main parts of the drawings *

1 drum 2 back plate

3: wheel cylinder 4: brake shoe

5: friction material 6: piston

6a: piston support portion 7: stopper

Technical Field of the Invention

The present invention relates to a drum brake of an automobile, and more particularly to a brake shoe of a drum brake having a stopper so that the swing range can be limited.

[Private Technology]

Typically, a brake system of an automobile is a device used to decelerate or stop a driving vehicle or to maintain a parking state. Such a brake system is typically used in a friction brake system that obtains a braking effect by converting kinetic energy of a vehicle into thermal energy and releasing frictional heat into the atmosphere using frictional force between the wheel and the brake member.

The friction brake system includes an operating mechanism for increasing the driver's operating force by using a link or hydraulic pressure and transmitting the same to the main body, and a brake main body generating a braking force by receiving the force transmitted from the operating mechanism.

The brake body also has a drum brake and a disk brake, and a dual drum brake is shown in FIG.

As shown in FIG. 1, the drum brake is a pair of brake shoes 4 which expand and contract by the operation of the drum 1, the back plate 2, the wheel cylinder 3 and the wheel cylinder 3 And a friction material 5 attached to the outer circumferential surface of the brake shoe 4 so as to be in close contact with the inner circumferential surface of the drum 1 when the brake shoe 4 is expanded.

The drum brake is mounted inside the disc of the tire wheel and rotates together with the wheel when the vehicle is driven. When the driver presses the brake pedal, the brake shoe 4 is drummed by the operation of the wheel cylinder 3 by hydraulic pressure transmitted from the master cylinder. As the friction material 5 extends toward (1) and comes into close contact with the inner circumferential surface of the drum 1, a braking force is generated by friction between the friction material 5 and the drum 1.

On the other hand, both brake shoes 4, which are expanded and contracted by the wheel cylinder 3, are secured by anchors at their other ends, and are connected by a plurality of springs so that the wheel cylinder 3 can be returned to its original state when the hydraulic pressure of the wheel cylinder 3 is removed. do.

[Technical problem to be achieved]

However, the brake shoe as described above is, as shown in FIG. 2, the end of the shoe contacting the support of the piston of the wheel cylinder and supported only by the tension of the spring. Therefore, when disassembling and assembling the brake system, there are many difficulties in work due to the shaking of the brake shoe, and there is a problem that the braking force may be caused when the tension of the spring changes.

Accordingly, an object of the present invention is to provide a brake shoe having a stopper so that the swing of the brake shoe is limited to a certain range in order to solve the above problems.

[Configuration and Function of Invention]

In order to achieve the above object, the brake shoe according to the present invention includes a cylindrical stopper having a diameter larger than the diameter of the support portion of the wheel cylinder piston, the support portion of the piston is accommodated in this stopper, characterized in that the swing range is limited It is done.

EXAMPLE

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the drawings.

As shown in Fig. 3, in the brake shoe having the cylindrical stopper according to the present invention, the cylindrical stopper 7 is welded and attached to one end supported by the cylinder 3. The stopper 7 has an inner diameter larger than the diameter of the support 6a of the piston 6 so that the support 6a of the piston 6 can be accommodated.

When the support part 6a of the piston 6 is accommodated in the stopper 7 as described above, and one end of the brake shoe 4 which is oscillated according to the change in the tension of the spring moves over a certain range, the inner circumferential surface of the stopper 7 moves to the piston. The movement of the brake shoe 4 is limited by touching the support part 6a of (6).

[Effects of the Invention]

As described above, according to the present invention, since the swinging range of the brake shoe is reduced by the stopper, convenience of work during maintenance of the brake system can be improved, and reliability of the brake system can be improved.

Claims (1)

A brake shoe for an automobile drum brake system, the brake shoe comprising a cylindrical stopper having a diameter larger than the diameter of the support portion of the wheel cylinder piston, wherein the support portion of the piston is accommodated in the stopper, thereby limiting the swing range.