Hydraulic drum brake with upper and lower double pushrods parking mechanism

Abstract

The invention provides a hydraulic drum type brake for a parking mechanism with upper and lower push rods. The hydraulic drum type brake solves the problem that the prior drum type brake is insufficient in brake friction force fundamentally, which comprises a brake base plate, a brake cylinder, an automatically adjusting device for brake clearances, a front brake shoe and a rear brake shoe. The technical points of the brake comprise that the push rods comprise a combined upper push rod and a lower push rod, the upper end of a parking draw arm is hinged together with the upper end of a supporting arm at the upper end of the rear brake shoe, and the middle part of the supporting arm is hinged with the rear brake shoe through a pin roll, a fork horn of the upper front push rod is tensioned on the front brake shoe, and a fork horn of the upper rear push rod is tensioned on the parking draw arm and the rear brake shoe; and the front end of the lower push rod is hinged on the front brake shoe, while the rear end is tensioned in an arc-shaped groove at the lower end of the supporting arm. The structural design is reasonable, the brake shoe is contacted fully with the brake surface of the brake drum to increase the brake friction force, so that the automobile needs no auxiliary parking brake when stopping at a ramp way, and the parking is safe and convenient, thereby not only improving the braking reliability of the parking mechanism, but also prolonging the service life of the brake.

Description

technical field [0001] The invention relates to an automobile hydraulic drum brake, in particular to a hydraulic drum brake with an up and down double push rod parking mechanism. It is suitable for the parking brake of all kinds of cars. Background technique [0002] At present, the parking mechanism of hydraulic drum brakes is still widely used in the domestic automobile field. The mainstream of drum brakes adopts an internal tension structure, which is mainly composed of a brake base plate fixed on the car shell by bolts, and fixed on the wheel rim by bolts. The brake drum on the brake pad, the brake wheel cylinder assembled on the brake base plate, the brake clearance self-adjusting device, the two braking devices assembled in the brake drum and connected to the brake base plate through the brake shoe tension spring and the push rod. Composed of moving hooves and other parts. Most of the existing parking mechanisms use a single push rod to push two symmetrically arrange...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a hydraulic drum brake with an upper and lower double push rod parking mechanism, which fundamentally solves the insufficient utilization of the brake shoe braking surface of the existing drum brake, the brake shoe and the brake The problem of insufficient braking friction between the drums, its structural design is reasonable, and the braking surface of the brake shoe is in full contact with the braking surface of the brake drum. Compared with similar products, under the same push rod thrust, it increases The brake friction between the brake shoe and the brake drum, the parking brake is not needed when the car is parked on a slope, the parking is safe and convenient, which not only improves the braking reliability of the parking mechanism, but also prolongs the service life of the brake

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