KR19980055348A - Drum brake device of automobile - Google Patents

Abstract

The present invention relates to a drum brake apparatus of a motor vehicle, and in particular, to solve the problem of the lining deviating from the brake shoe due to a large load acting in the direction of rotation of the wheel. To this end, the present invention, in the fastening structure of the lining friction with the brake drum, and the rim of the brake shoe, a projection (1b) is formed on the surface of the rim (1a) of the brake shoe 1, corresponding to the projection The groove 4a is formed in the lining 4, and the rim and lining of the brake shoe are made of a technical configuration to be bonded by the adhesive (7).

Description

Drum brake device of automobile

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum brake device of a motor vehicle, and more particularly, to a drum brake device having improved durability by improving a coupling structure of a lining of a brake drum and a rim of a brake shoe.

As is well known, the braking device of a vehicle is used to maintain a parking state at the same time as decelerating or stopping a driving vehicle, and converts kinetic energy of the vehicle into thermal energy by using frictional force, and releases the heat into the atmosphere to provide braking force. Friction brakes that generate heat are mainly used.

The basic structure of such a braking device is composed of an operation mechanism that increases and transmits the pedal effort of a pedal operated by a driver using a link or hydraulic pressure, and a brake body that receives the force to generate a braking force.

In this case, the brake main body is generally configured to have a disc brake on the front axle and a drum brake on the rear axle in a passenger car.

1 shows a conventionally known structure of a drum type brake provided on a rear axle.

The drum brake device rotates at high speed together with the wheels and tires, a brake drum (not shown) supported by the rear spindle via a hub bearing and a cap, a brake shoe 1 which is in frictional contact with the brake drum, and The wheel cylinder 2 which expands this brake shoe 1, and the back plate 3 which supports the brake shoe 1 and the wheel cylinder 2, and is fixed to the said rear spindle are comprised.

In addition, the brake shoe 1 is formed in a semicircular structure with a lining 4 attached to an outer surface thereof, one end of which is fixed to the back plate 3 via an anchor 5, and the other end of which is connected to the wheel cylinder 2. do. Both brake shoes 1 are supported by springs 6 arranged up and down, and are configured to receive a restoring force after braking.

In the drum brake device configured as described above, when the driver presses the brake pedal, the wheel cylinder 2 is expanded by the hydraulic pressure boosted by the master cylinder, and the brake shoe 1 is extended by the wheel cylinder 2, and the surface thereof. As the lining 4 attached to it comes into contact with and rubs against the brake drum, a braking force is generated.

On the other hand, when the pedal effort of the brake pedal is removed by the driver, the hydraulic pressure of the wheel cylinder 2 is removed, and both brake shoes 1 are returned by the restoring force of the spring 6, thereby stopping friction with the brake drum. And the braking force is released.

In the above drum brake device, the conventional lining 4 is adhered by simply applying an adhesive 7 to the surface of the rim 1a of the brake shoe 1, as shown in FIG.

However, since the lining 4 is subjected to a large load that is pushed in the direction of rotation of the wheel when friction with the brake drum, there is a problem that the lining 4 is easily detached when the load is caused by poor adhesion or long braking.

In order to solve the problems of the prior art, the present invention is to increase the coupling force between the rim and lining of the brake shoe, preventing the breakage of the line, to prevent the breakdown of the brake in advance of the car drum Provide a brake device.

1 is a perspective view showing a drum brake device of a typical vehicle.

Figure 2 is a front view showing a coupling structure of a conventionally known brake shoe and lining.

Figure 3 is a front sectional view showing a coupling structure of the brake shoe and the lining of the drum brake device according to the present invention.

Figure 4 is a side view showing a brake shoe of the drum brake device according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Brake shoe 1a: Rim

1b: projection 4: lining

4a: groove 7: adhesive

As a means for realizing the above object, the drum brake device of the present invention has a lining in friction with a brake drum and a fastening structure between the rim of the brake shoe, wherein a projection is formed on the rim surface of the brake shoe, and the projection Groove corresponding to the formed in the lining, the rim and the lining of the brake shoe is made of a technical configuration bonded by an adhesive.

According to this configuration, the lining of the present invention has sufficient durability against the load generated upon friction with the brake drum by the projection of the rim of the brake shoe projecting at right angles to the direction of rotation of the wheel.

Thus, the lining of the invention prevents the departure from the brake shoe.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment for implementing this invention is demonstrated in detail based on an accompanying drawing.

EXAMPLE

3 is a front sectional view showing a coupling structure of a brake shoe and a lining of the drum brake device according to the present embodiment, and FIG. 4 is a side view showing the brake shoe of FIG.

In describing the present embodiment, the same reference numerals are used for the configuration of the present embodiment, which is the same as the drawings cited in the prior art, and will not be described again for clarity.

In the drawings, reference numeral 1 denotes a brake shoe, 1a denotes a rim of the brake shoe, 4 denotes a lining, and 7 denotes an adhesive.

As described above, the lining 4 is attached to the rim 1a of the two brake shoes 1 formed in a substantially semi-circular shape, so that one end of the brake shoe 1 is supported on the back plate by the anchor, As the wheel cylinder installed at the other end is opened by being expanded, it is rubbed with the brake drum.

In this case, since the lining 4 is subjected to the load F acting in the direction of rotation of the wheel, it is structurally weak and a firm coupling force with the brake shoe 1 is required.

In order to realize this, the rim 1a of the brake shoe 1 of the present embodiment is formed with a projection 1b projecting to be perpendicular to the load F. In addition, the lining 4 is formed with a groove 4a corresponding to the protrusion 1b.

The brake shoe 1 and the lining 4 configured as described above are fastened to the protrusion 1b and the groove 4a so as to be fitted to each other, and the adhesive 7 is coated on the surface thereof.

Based on the above-described configuration, the lining 4 of the present embodiment is generated at the time of friction with the brake drum by the projection 1b of the rim 1a of the brake shoe 1 projecting at right angles to the direction of rotation of the wheel. The reaction force is applied to the load F to be applied.

Therefore, the lining 4 of the present invention is prevented from being separated from the brake shoe 1.

Through the embodiments described above, it can be seen that the drum brake device of the automobile according to the present invention substantially solves the problems of the prior art.

That is, according to the present invention, the effect of preventing the removal of the lining is obtained.

In addition, the durability of the lining is improved, so that an accident occurrence due to a breakdown of the brake is prevented in advance.

On the other hand, the present invention is not limited to the above-described specific preferred embodiment, and any person having ordinary skill in the art to which the invention belongs without departing from the gist of the invention claimed in the claims, various modifications Would be possible.

Claims (1)

A brake drum rotatably mounted to the rear spindle with a wheel, a back plate fixed to the rear spindle, a lining to be rubbed with the brake drum, two semicircular brake shoes to which the lining is bonded, and the brake shoe A wheel cylinder installed at one end to expand, a return spring connected between the two brake shoes, an anchor fixed to the other end of the brake shoe, a protrusion formed on the rim surface of the brake shoe, and the projection Comprising a groove formed in the lining corresponding to the rim and lining of the brake shoe of the automobile, characterized in that the coupling is bonded by an adhesive.