Multi-brake-shoe drum brake and working method

Abstract

The invention discloses a multi-brake-shoe drum brake and a working method. The multi-brake-shoe drum brake comprises internal expansion type brake mechanisms, a brake bottom plate, external bundling type brake mechanisms and a brake drum. The inner expansion type brake mechanisms and the outer bundling type brake mechanisms both comprise a rectangular sealing ring and a piston, an annular groove is formed in the inner wall of the brake bottom plate, the rectangular sealing rings are embedded into the annular groove, friction plates are installed at the top ends of the pistons, the outer side of a hydraulic brake wheel cylinder is connected with an oil pipeline, the oil pipeline is filled with oil, and the oil pipeline communicates with an inner cavity of the brake bottom plate. Partition plates are installed at the positions, on one sides of the pistons, in the brake bottom plate, the oil and the pistons are located on the two sides of the partition plates correspondingly, and one-way valves and back pressure valves are installed on the partition plates. According to the multi-brake-shoe drum brake and the working method, the brake drum is tightly pressed by using the internal expansion type brake mechanisms and the external bundling type brake mechanisms, and friction force is applied; and meanwhile, through the plurality of groups of back pressure valves with different opening pressures and the friction plates with different friction coefficients, the plurality of groups of internal expansion type brake mechanisms and external bundling type brake mechanisms can act in sequence.

Description

Technical field: [0001] The invention relates to a multi-brake shoe drum brake and a working method thereof, which belong to the technical field of automobile chassis brake systems. Background technique: [0002] The brake is a component in the braking system that is used to generate a force that hinders the movement or movement tendency of the vehicle. It usually uses the friction between the fixed element and the working surface of the rotating element to generate the braking torque. Friction brakes used in various types of vehicles can be divided into two categories: disc type and drum type. [0003] At present, drum brakes have been widely used because of their low price and high braking force. However, there are many problems, such as the poor braking performance and heat dissipation of drum brakes; if the brakes of internal tension and external beams are not realized at the same time; if the friction plate is worn out, maintenance and adjustment are required; if the f...

AI Technical Summary

Problems solved by technology

However, there are many problems, such as the poor braking performance and heat dissipation of drum brakes; if the brakes of internal tension and external beams are not realized at the same time; if the friction plate is worn out, maintenance and adjustment are required; if the friction coefficient is fixed and cannot be changed, Cannot rapidly increase braking force, etc.

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