Lever drum brake

Abstract

The invention discloses a lever drum brake. The lever drum brake comprises a brake bottom plate, an anti-meshing connecting rod, brake shoes, friction plates, a return spring and a linkage mechanism. The brake bottom plate is provided with a circular hole set and a fixing hole. Two through holes are formed in the bottom end of the brake bottom plate. The brake shoes are arranged on the two sides of the brake bottom plate and include the first brake shoe and the second brake shoe. The friction plates are arranged on the outer side of the first brake shoe and the outer side of the second brake shoe. Each of the first brake shoe and the second brake shoe is provided with two installing plates. An installing groove is formed between every two installing plates, and rotation columns and small holes are formed in the bottom ends between every two installing plates. According to the lever drum brake, the two brake shoes are connected through a braking force balance mechanism, braking force balance is achieved, a positioning block moves in the axial direction of the bottom plate, and the braking torque is fixedly adjusted.

Description

technical field [0001] The invention relates to the field of vehicle brakes, in particular to a lever drum brake. Background technique [0002] When the car brakes, the brake adjustment arm drives the camshaft to rotate under the action of the push rod of the brake air chamber, so that the two brake shoes are pressed against the brake drum to generate friction, thereby achieving a braking effect. Whether it is forward or backward, it is the same working condition when braking. Since the contact between the brake shoe grinding plate and the hub is not in the entire circular arc, the braking force cannot achieve the maximum effect, and the friction plate fits unevenly, resulting in uneven friction. , the area with strong local bonding force has high friction force, and the area with small bonding force has small friction force, so the efficiency of the overall frictional braking force cannot be fully exerted. In addition, due to structural problems, the friction force generate...

AI Technical Summary

Problems solved by technology

[0002] When the car brakes, the brake adjustment arm drives the camshaft to rotate under the action of the push rod of the brake air chamber, so that the two brake shoes are pressed against the brake drum to generate friction, thereby achieving a braking effect. Whether it is forward or backward, it is the same working condition when braking. Since the contact between the brake shoe grinding plate and the hub is not in the entire circular arc, the braking force cannot achieve the maximum effect, and the friction plate fits unevenly, resulting in uneven friction. , the area with strong local bonding force has high friction force, and the area with small bonding force has small friction force, so the efficiency of the overall frictional braking force cannot be fully exerted. In addition, due to structural problems, the friction force generated by the two brake shoes and the hub is different. Friction plates with strong force wear quickly, so the replacement cycle of friction plates is short, and friction plates that do not meet the wear requirements also need to be replaced together, wasting manpower and financial resources

Part of the friction plate is too fast and easy to wear to the wear limit, while other parts only wear a small amount, and the friction plate is scrapped prematurely, resulting in waste of materials, and the new vehicle is caused by the deviation of the brake friction plate and the brake drum due to many reasons. There is no effective way to solve the brake deviation. Therefore, due to the structural defects of the brake, in order to improve the braking performance in the industry, the air pressure of the brake cylinder is unilaterally increased, and the rotational thrust of the brake cam is increased to generate the adhesion between the brake shoe and the hub. The resultant force increases the braking torque. This effect is not ideal, and it will also cause insufficient mechanical strength and performance of other structural parts, or suppress the spatial range of the structural layout.

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