Pre-split brake drum

Abstract

The invention discloses a pre-split brake drum, which comprises a cast-formed brake drum body, the brake drum body includes a mounting part and a braking part, and a transition connection part is provided between the mounting part and the braking part; There is a crack that runs through the wall thickness of the brake part on the part, and the crack extends from one end far away from the transition connection part to the transition connection part; the outer periphery of the brake part is equipped with a number of axially arranged and interference fit with the brake part steel hoop. The brake drum body is pre-cracked through cracks to form an elastic body, which improves the force effect and enhances the impact force of slow resistance; at the same time, the brake drum body only bears the rotational friction braking force; the brake drum body is heated and powerfully expanded When the tight force acts, the crack can eliminate the expansion stress in time and reduce the cracking phenomenon. The steel hoop bears the brake tension force, which enhances the tensile strength and variable stiffness of the brake drum. The use of the brake drum improves the structural strength and mechanical performance, prolongs the service life of the brake drum, has good heat dissipation and high safety in use.

Description

Technical field [0001] The invention belongs to the technical field of automobile brake systems, and particularly relates to a pre-split brake drum. Background technique [0002] The brake system is one of the important components of the automobile. At present, in the field of trucks, the more widely used one is the traditional integral cast drum brake. [0003] At this stage, a typical drum brake consists of a brake drum and brake shoes, and the brake shoes can contact 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 is used to make the driving The car slows down or stops to ensure driving safety. [0004] When the car is heavily loaded and driving at high speed, especially when going down a long or steep slope, the temperature of the inner wall of the brake drum ris...

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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