Presplitting drum brake

Abstract

The invention discloses a presplitting drum brake, which comprises a drum brake body which is molded by casting, wherein the drum brake body comprises a mounting part and a braking part; a transition connection part is arranged between the mounting part and the braking part; a crack which penetrates through the wall thickness of the braking part is arranged on the braking part; the crack extends from one end part which is far away from the transition connection part to the transition connection part; a plurality of steel hoops which are axially arrayed and are in interference fit with the braking part sleeve the periphery of the braking part. The drum brake body is presplit by the crack to form an elastomer, the stress effect is improved, and the resistance buffering impact force is enhanced; meanwhile, the drum brake body only bears the rotation friction braking force; when the drum brake body is heated and strong tension force acts, the crack is capable of eliminating the expansion stress in time, and the fracturing phenomenon is reduced. The brake tension force is borne by the steel hoops, and the strength of extension and the anti-deformation rigidity of the drum brake are enhanced. Due to the adoption of the drum brake, the structural intensity and the mechanical performance are improved, the service life of the drum brake is prolonged, the radiating performance is good, and the use safety is high.

Description

technical field [0001] The invention belongs to the technical field of automobile brake systems, in particular to a pre-cracked brake drum. Background technique [0002] The braking system is one of the important components of the automobile. At present, in the field of trucks, the traditional integral casting drum brake is widely used. [0003] At present, a typical drum brake consists of a brake drum and a brake shoe, and the brake shoe can be in contact with the inner surface of the brake drum. The brake drum is in a rotating state when the car is running. When braking is required, the brake shoe is pressed against the brake drum under the action of the braking force, and the frictional resistance between the brake drum and the brake drum is used to make the driving The car slows down or stops to ensure driving safety. [0004] When the car is heavy-loaded and running at high speed, especially when going down a long or steep slope, the temperature of the inner wall of t...

AI Technical Summary

Problems solved by technology

[0004] When the car is heavy-loaded and running at high speed, especially when going down a long or steep slope, the temperature of the inner wall of the brake drum rises sharply due to the need for a large braking force and multiple consecutive brakes to ensure that the car is in a controllable state. The temperature difference between the inside and outside of the brake drum increases, resulting in a sharp decline in the high-temperature mechanical properties of the brake drum material and a decrease in fatigue strength

Since the traditional brake drum is made of gray cast iron, gray cast iron has the typical characteristics of low strength and high brittleness. In order to reduce the negative effects brought by these characteristics, the wall thickness of the brake drum must be made very thick to ensure braking. Drums have high structural strength

However, the greater the wall thickness of the brake drum, the greater the temperature difference between the inside and outside of the brake drum during braking. The stress cannot be eliminated in time, which will cause the inner wall of the brake drum to develop from longitudinal microcracks to cracks, so that the brake drum finally cracks

Therefore, the service life of the traditional integral casting brake drum is relatively short

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