Novel drum brake wheel cylinder structure

Abstract

The invention relates to a novel drum brake wheel cylinder structure, and belongs to the technical field of automobile braking. A first wheel cylinder piston and a second wheel cylinder piston are assembled on the two sides of a wheel cylinder hole respectively, and a wheel cylinder is in clearance fit with the first wheel cylinder piston and the second wheel cylinder piston. A first sealing function piece is connected with the first wheel cylinder piston and the wheel cylinder separately, and a second sealing function piece is connected with the second wheel cylinder piston and the wheel cylinder separately. Two leather cup mounting grooves are formed in an inner hole of the wheel cylinder, the first leather cup and the second leather cup are arranged in the leather cup mounting grooves of the wheel cylinder respectively, and a wheel cylinder spring is installed between the first wheel cylinder piston and the second wheel cylinder piston. The first wheel cylinder piston and the secondwheel cylinder piston are provided with outer cylindrical surfaces. The novel drum brake wheel cylinder structure has the advantages that the structure is novel, the axial matching length of the wheel cylinder pistons and the wheel cylinder hole is increased, the guide performance of the wheel cylinder hole to the wheel cylinder pistons is kept, and the eccentric abrasion phenomenon of the wheelcylinder pistons in the braking process is relieved, so that the higher the roughness grade of the outer surfaces of the wheel cylinder pistons is, the better the dynamic sealing performance of the wheel cylinder pistons is.

Description

technical field [0001] The invention belongs to the technical field of automobile braking, in particular to an improvement to a drum brake wheel cylinder. Background technique [0002] Drum brakes are the brake actuators in the brake system and the key components in the car brake system. Its working principle is to use the hydraulic pressure generated by the brake master cylinder assembly to transmit to the wheel cylinder assembly in the rear drum brake through the brake pipeline. After the wheel cylinder piston pushes the brake shoe parts under the hydraulic pressure, the brake shoe Components that create frictional resistance against the drum to resist the wheel's rotation or tendency to rotate. Drum brakes have fewer components than disc brakes, have a simpler structure, and are less expensive to manufacture. [0003] When the vehicle is running normally, under the combined action of the clearance adjustment mechanism and the reset mechanism inside the drum brake, the f...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a novel drum brake wheel cylinder structure to solve the problem that the piston protrudes too much relative to the wheel cylinder mouth in the existing wheel cylinder structure, the matching length between the outer cylindrical surface of the piston and the cylindrical surface of the inner hole of the wheel cylinder is very small, and the piston Under the action of the hydraulic pressure and the pressure of the brake shoe parts, it is easy to deflect, resulting in increased wear of the piston and the inner hole of the wheel cylinder, deterioration of the sealing of the cup, and even the problem of the piston returning stuck.

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