Brake control mechanism and tractor

Abstract

The invention discloses a brake control mechanism and a tractor, and belongs to the field of tractor brake. The brake control mechanism comprises a brake pedal, a two-stage brake pump, a brake oil pipe and a return compensation brake. A first piston cavity and a second piston cavity which communicate with each other are formed in the two-stage brake pump, piston assemblies are arranged in the two cavities, and channels communicating the two cavities are formed in the piston assemblies. The brake pedal is connected with a piston assembly of the two-stage brake pump, and an oil output port of the second piston cavity is connected with the return compensation brake through a brake oil pipe. The invention further discloses a tractor. According to the brake control mechanism, oil is supplied through the brake pedal, oil pressure needed by all stages during braking is transmitted through the two-stage brake pump, then the oil pressure is stably transmitted through the brake oil pipe and reaches the return compensation brake, and the effects of vehicle braking and return and abrasion compensation in the brake are guaranteed; and in the whole process, the braking comfort and safety are improved, the service life of the whole brake is prolonged, and the later maintenance cost is reduced.

Description

technical field [0001] The invention relates to the field of tractor braking, in particular to a brake control mechanism and a tractor. Background technique [0002] At present, the commonly used hydraulic brake control mechanism in China is a pedal brake control mechanism installed on the chassis. Specifically, the brake pedal pushes the brake pump push rod to generate oil pressure, which is transmitted through the brake hard pipe. to the brake, and then generate braking force to realize wheel braking. This type of operating mechanism is simple in structure, economical and practical. [0003] However, the current common brake pump is an ordinary dual-cavity brake pump, and the diameter of the brake pump working chamber is constant, which cannot take into account both the reduction of the brake pedal stroke and the reduction of the pedal force of the brake pedal; [0004] Brake hard pipes are mostly one-piece hard pipe structure. One end of the left / right brake hard pipe is...

AI Technical Summary

Problems solved by technology

During the driving process, since the front / rear connection is a movable connection, the cab will drive the hard pipe connected to the brake pump to vibrate. During the repeated vibration process, the service life of the brake hard pipe is reduced and the driving safety is affected;

[0005] Most of the brakes are non-self-energizing full-disc wet brakes, and the friction plate has no self-adjusting clearance function. After a long time of work, the friction plate is easy to wear and cause errors in the braking stroke, and the piston cannot return quickly after braking. Friction lining wear rate

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