Self-adjustable manually-driven drum brake

Abstract

The invention relates to a self-adjustable manually-driven drum brake. The problems that in an existing manually-driven drum brake, a brake gap cannot be automatically adjusted, and a friction plate needs to be frequently replaced are mainly solved. The self-adjustable manually-driven drum brake is characterized in that the other ends of two brake shoe plates (2) are provided with racks (5) which vertically correspond to each other respectively, a brake shoe actuating device (3) comprises a gear (31), a gear shaft (32) and a swing arm (7), the gear shaft (32) is installed on a brake base plate (1) in a penetrating mode, an automatic gap adjusting device (8) is connected between the two brake shoe plates (2) and comprises a casing pipe (81) and a ratchet bar (82), and the two brake shoe plates (2) are each provided with a brake gap limiting hole (84). According to the drum brake, automatic compensation of the brake gap is achieved on the manually-driven drum brake, the service life is prolonged, the repairing and maintaining cost is reduced, and the advantages of being free of adjustment and easy to assemble are achieved.

Description

technical field [0001] The invention relates to a vehicle brake device, in particular to a self-adjusting human-driven drum brake. Background technique [0002] Drum brakes are a common vehicle braking device. Drum brakes are mainly divided into: human-driven drum brakes and dynamic brake drum brakes according to the driving source. The existing human-driven drum brake includes a brake base plate, two symmetrical brake shoes, a brake shoe actuator and a return spring. One end of the two brake shoes is hinged on the brake base plate. The corresponding surface of the other end of the moving shoe is provided with a brake shoe actuating device and a return spring. The brake shoe actuating device includes a cam, a camshaft and a swing arm. The cam is placed between the two brake shoes. The swing arm is connected to the brake pedal through a transmission mechanism such as a crank arm and a pull rod. When braking, the brake pedal is stepped on by manpower, and the camshaft drives ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the brake gap of the existing human-driven drum brake cannot be automatically adjusted and the friction lining needs to be replaced frequently, the present invention provides a self-adjusting human-driven drum brake, which is based on the prior art The automatic adjustment device for the brake gap with the rack and pawl structure is added, and the structure of the brake shoe actuator is changed at the same time, and then the automatic compensation of the brake gap is realized on the human-driven drum brake, which improves the service life and reduces maintenance. and maintenance costs, and also has the characteristics of free debugging and easy assembly

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