A drum brake shoe with protective performance

Abstract

The invention relates to the technical field of car brake shoes, in particular to a drum type brake shoe with protecting performance. A brake mechanism is mounted on the outer side of the brake shoe;during slow braking, a brake pad on a first floating plate is firstly contacted with the inner wall of a brake drum to produce brake effect, a pressure spring between the first floating plate and thebrake shoe is compressed continuously in the process of realizing the complete braking effect gradually, the braking effect is enhanced gradually, meanwhile, a second floating plate is lifted up by the first floating plate through a press plate to be close to the inner wall of the brake drum gradually, a brake pad on the second floating plate can produce the brake effect on the brake drum during complete braking, and under the condition of incomplete braking, wear, produced by the second floating plate, of the brake drum is far smaller than that, produced by the first floating plate, of the brake drum; the good brake effect can be realized under the condition of emergency braking; the problem of brake effect reduction caused by increased distance between the brake shoe and the brake hub after the inner wall of the brake drum is worn by the traditional brake shoe is solved.

Description

technical field [0001] The invention relates to the technical field of automobile brake shoes, in particular to a drum brake shoe with protective performance. Background technique [0002] Drum brakes Generally, drum brakes are composed of rotating parts and fixed parts, including brake base plates, brake wheel cylinders, brake shoes, etc. Drum brakes have a cast iron piece similar to a tambourine, called a brake drum, which is fixed to the tire. and rotate at the same speed. Drum brakes have lower cost and higher absolute braking force, and are more widely used in the rear wheels of small cars. But its wear rate is high, so the overall cost is high at the same time. The brake shoe refers to the accessories that are pushed outward by the force of the brake wheel cylinder or push rod to suppress the brake drum to perform the braking effect. It is installed on the brake drum. It is one of the key safety parts in the automobile braking system. The shape of the brake shoes is...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a drum type brake shoe with protective performance in view of the above-mentioned technical deficiencies, which adopts a brake mechanism installed on the outside of the brake shoe; The brake pads on the plate first contact the inner wall of the brake drum to produce a braking effect. In the process of gradually reaching the full braking effect, the compression spring between the first floating plate and the brake shoe is continuously compressed, and the braking effect is gradually enhanced. At the same time, the first floating plate lifts the second floating plate through the pressure plate and gradually approaches the inner wall of the brake drum. When the brake is fully braked, the brake pads on the second floating plate have a braking effect on the brake drum. In the case of dynamic braking, the wear of the second floating plate on the brake drum is far less than that of the first floating plate on the brake drum; it can have a good braking effect in the case of emergency braking; it solves the problem of traditional brake After the shoe wears on the inner wall of the brake drum, the distance between the brake shoe and the brake hub increases, resulting in a decrease in the braking effect

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