Hydraulic wheel cylinder allowing manual and automatic integrated adjusting of brake clearance

Abstract

The invention relates to a hydraulic wheel cylinder allowing manual and automatic integrated adjusting of brake clearance. A section of spiral groove is formed in an outer circumferential surface of a piston of the hydraulic wheel cylinder; a pin penetrating through a cylinder body from the outside in the radial direction is inserted into the spiral groove, and the piston is driven by the pin to rotate in the axial movement process of the piston; a clutch sleeve is arranged in an inner cavity of the piston, and conical end face convex teeth are arranged at the outer end of the clutch sleeve and used for being meshed with conical end face concave teeth on a drive plate for transmission. A clutch is arranged between the clutch sleeve and the piston, and the clutch state of the clutch is that the clutch sleeve and the piston are in a separation state in the braking process, and the clutch sleeve and the piston are in a connection state in the braking releasing process. The dual functions of manual adjustment and automatic adjustment can be conveniently achieved, and the requirement for disassembling a brake conveniently when a brake shoe is replaced is met; and meanwhile, stepless fine adjustment can be achieved, over-adjustment is avoided, and brake dragging abrasion and locking faults caused by over-adjustment are avoided.

Description

technical field [0001] The invention relates to an automobile hydraulic brake gap adjustment device, in particular to a hydraulic brake wheel cylinder capable of automatically adjusting the brake gap. Background technique [0002] There should be a normal and reasonable minimum gap between the brake shoe and the brake drum in the automobile service brake, that is, the brake gap to ensure the best braking effect of the brake, but this gap will be affected by the use of the brake, The wear of the shoe gradually increases, and the clearance between the four wheels cannot be maintained at the same level, resulting in braking lag, deviation, and excessive braking distance, which will bring unsafe hidden dangers to driving, and even cause traffic accidents. Therefore, it is necessary to adjust the position of the brake shoe in time to keep the normal gap between it and the brake drum. At present, most of the brake gap adjustment mechanisms used in domestic various models of hydra...

AI Technical Summary

Problems solved by technology

Manually use a screwdriver under the car to turn the dial on the adjustment mechanism at one end of the hydraulic wheel cylinder to make the threaded rod in the center of the dial stretch to lift the brake shoe close to the brake drum and reduce the gap between the shoe and the brake drum The gap, the manual defect is that it cannot be adjusted in time, because of the wear and tear caused by braking at any time, and manual adjustment cannot be carried out at any time. In addition, the manual adjustment operation needs to be carried out under the car, which is time-consuming and laborious. If you want to make accurate and fast adjustments , also need experienced people to operate

[0003] At present, most of the existing automatic adjustment technologies use a saw-tooth one-way clutch. The adjustment method is a step shifting gear type, and the adjustment is performed during the braking process. The adjustment range is large and the accuracy is not high, and over-adjustment is easy to occur. It leads to brake dragging and locking. At the same time, its structure is complex, the machining accuracy is high, and the price is high. In some technologies, it is impossible to retreat and adjust the brake clearance when the shoe needs to be replaced, resulting in the brake drum. Difficult to disassemble

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