CN210371759U - Drum brake - Google Patents

Abstract

The utility model discloses a drum brake, which comprises a bottom plate, an S-shaped cam shaft, two brake shoes, wherein one ends of the two brake shoes are respectively connected with the brake bottom plate through bolts, and the other ends of the two brake shoes are respectively attached to and act on two concave surfaces of the S-shaped cam shaft; a return spring is arranged at one end, attached to the S-shaped cam shaft, of the brake shoe and is of a semi-closed arch structure, two ends of the return spring are respectively inserted into an inner cavity of the brake shoe, a plurality of stop pins are arranged on the brake shoe, and the inner side of the return spring is clamped on the stop pins. Use a drum brake, return spring is semi-enclosed hunch column structure, is connected through backing pin and bolt and bottom plate and brake shoe, can realize return spring and install the structure inside the brake shoe, fundamentally has solved the motion interference risk that outer dress spring arouses to dismantle simply easy maintenance.

Description

Drum brake

Technical Field

The utility model relates to an automobile parts, especially a drum brake.

Background

Drum brakes are the most commonly used automotive brakes, and due to their simple structure and low cost, drum brakes are used for almost 95% or more, particularly in the commercial vehicle sector. The structure of the brake shoe is that a bottom plate is provided with two brake shoes which are arranged in bilateral symmetry, and the brake shoes are opened through the rotation of a cam during braking to be actuated to be expanded outwards to rub with a brake drum product, so that the rotating speed of the brake drum or the running speed of the whole vehicle is reduced. After the brake pedal is released, the two brake shoes return through the return springs to keep a gap between the two brake shoes and the brake drum. The spring is an important part in the drum brake, and poor performance of the spring can cause the brake shoe to be unsmooth in return, so that the brake shoe is dragged with a brake drum, and the brake heating causes the reduction of the brake performance.

At present, the spring of the domestic drum brake basically adopts a steel wire spiral spring structure, the installation space of the spring is narrow and small, the working position of the spring is constantly changed, particularly, the radial size of the spring and the radial size of a bridge shaft are along with the abrasion of a brake drum and a friction plate and the requirement of the motion range of the brake, the size of the spring is reduced, the spring is interfered with parts in the drum, the damage of the spring is further caused, the bad hidden danger of braking is further brought, and even the safety accident that the brake is not returned and locked is caused.

Disclosure of Invention

The utility model aims at providing a drum brake has cancelled former spiral spring structure of adorning outward and has installed inside the brake shoe, and fundamentally has solved the motion and has interfered the risk. And is easy to disassemble.

In order to solve the technical problem, the technical scheme of the utility model as follows: a drum brake comprises a bottom plate, an S-shaped cam shaft, two brake shoes, a brake block and a brake block, wherein one ends of the two brake shoes are respectively connected with the brake bottom plate through bolts, and the other ends of the two brake shoes are respectively attached to and act on two concave surfaces of the S-shaped cam shaft; the one end of the attached S type camshaft of brake shoe is provided with return spring, its characterized in that: the brake shoe is characterized in that the return spring is of a semi-closed arch structure, two ends of the return spring are respectively inserted into an inner cavity of the brake shoe, a plurality of stop pins are arranged on the brake shoe, and the inner side of the return spring is clamped on the stop pins.

The improvement of the technical scheme is as follows: the brake shoe is inserted and clamped on the bottom plate along the direction of the return spring, the number of the stop pins is four, and the four stop pins are symmetrically arranged on the brake shoe.

The technical scheme is further improved as follows: and clamping grooves are formed in the inner sides of two ends of the return spring.

Has the advantages that:

use a drum brake, return spring is semi-enclosed hunch column structure, is connected through backing pin and bolt and bottom plate and brake shoe, can realize return spring and install the structure inside the brake shoe, fundamentally has solved the motion interference risk that outer dress spring arouses to dismantle simply easy maintenance.

Drawings

FIG. 1 is a production drawing of a return spring

Fig. 2 is a schematic diagram of a product diagram structure.

In the figure: the brake shoe comprises a brake shoe 1, a bottom plate 2, an S-shaped cam shaft 3, a stop pin 4, a return spring 5, a bolt 6 and a clamping groove 7.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Referring to fig. 1 and 2, the drum brake of the present invention comprises a bottom plate 2, an S-shaped camshaft 3, and two brake shoes 1, one end of each of which is connected to the bottom plate 2 through a bolt 6, and the other end of each of which is attached to and acts on two concave surfaces of the S-shaped camshaft 3; a return spring 5 is arranged at one end of the brake shoe 1, which is attached to the S-shaped cam shaft 3, the return spring 5 is of a semi-closed arch structure, two ends of the return spring 5 are respectively inserted into an inner cavity of the brake shoe 1, a plurality of stop pins 4 are arranged on the brake shoe 1, and the inner side of the return spring 5 is clamped on the stop pins 4; and clamping grooves 7 are formed in the inner sides of two ends of the return spring 5.

In the structure shown in fig. 2, a return spring 5 is fixed on a bottom plate 2 through a bolt 6, a brake shoe is inserted into and clamped on the bottom plate along the spring direction, and four stop pins 4 are inserted, so that the brake shoe can be pressed towards the center.

The foregoing embodiments have shown and described the principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (3)

1. A drum brake comprises a bottom plate, an S-shaped cam shaft, two brake shoes, a brake block and a brake block, wherein one ends of the two brake shoes are respectively connected with the brake bottom plate through bolts, and the other ends of the two brake shoes are respectively attached to and act on two concave surfaces of the S-shaped cam shaft; the one end of the attached S type camshaft of brake shoe is provided with return spring, its characterized in that: the brake shoe is characterized in that the return spring is of a semi-closed arch structure, two ends of the return spring are respectively inserted into an inner cavity of the brake shoe, a plurality of stop pins are arranged on the brake shoe, and the inner side of the return spring is clamped on the stop pins.

2. A drum brake according to claim 1, in which: the brake shoe is inserted and clamped on the bottom plate along the direction of the return spring, the number of the stop pins is four, and the four stop pins are symmetrically arranged on the brake shoe.

3. A drum brake according to claim 1 or 2, in which: and clamping grooves are formed in the inner sides of two ends of the return spring.

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