Brake master cylinder

Abstract

The invention provides a brake master cylinder, and belongs to the technical field of brake systems. The technical problem that an existing brake pump cannot achieve front-back brake synchronization under the influence of a spring is solved. The brake master cylinder comprises a pump body and a movable piston assembly. A pump cavity is formed in the pump body. The movable piston assembly is arranged in the pump cavity. A front oil inlet pipe and a rear oil inlet pipe are convexly arranged on the outer side wall of the pump body. A front overflow hole, a front oil through hole, a rear overflowhole and a rear oil through hole are formed in the outer side wall of the pump body. The pump cavity is divided into a front cavity and a rear cavity. The inner diameter of the front cavity is largerthan that of the rear cavity. The front overflow hole and the front oil through hole are communicated with the front cavity and the front oil inlet pipe respectively. The rear overflow hole and the rear oil through hole are communicated with the rear cavity and the rear oil inlet pipe respectively. A front leather cup and a rear leather cup are arranged on the piston assembly. The oil flow of thefront cavity is larger than that of the rear cavity. The distance difference generated during the movement of the front leather cup and the rear leather cup is made up. When the front overflow hole and the rear overflow hole are blocked asynchronously, the simultaneous braking of a front brake and a rear brake can also be achieved.

Description

technical field [0001] The invention belongs to the technical field of brake systems and relates to a brake master cylinder. Background technique [0002] The combined brake pump, also known as the brake master cylinder, controls the front brake and the rear brake respectively through two oil circuits in one pump body, so as to achieve the purpose of simultaneously braking the front brake and the rear brake. [0003] The existing combined brake pump includes an oil cup and a pump body that is fixedly connected with the oil cup and communicates with the oil cup. A pump chamber is opened in the pump body. The outer wall of the pump body is protruded with forward oil pipes, rear oil inlet pipes and front oil outlet pipes. 1. Rear oil outlet pipe. On the outer wall of the pump body, there are front overflow hole, front oil through hole, rear overflow hole and rear oil through hole. The rear overflow hole and the rear oil hole are respectively connected with the pump chamber and...

AI Technical Summary

Problems solved by technology

[0003] The existing combined brake pump includes an oil cup and a pump body that is fixedly connected with the oil cup and communicates with the oil cup. A pump chamber is opened in the pump body. The outer wall of the pump body is protruded with forward oil pipes, rear oil inlet pipes and front oil outlet pipes. 1. Rear oil outlet pipe. On the outer wall of the pump body, there are front overflow hole, front oil through hole, rear overflow hole and rear oil through hole. The rear overflow hole and the rear oil hole are respectively connected with the pump chamber and the rear oil inlet pipe. There is a brake piston in the pump chamber, and a front cup, a rear cup and a spring are installed on the brake piston. The rear cups are attached to the inner wall of the pump chamber respectively, the front cup is located between the front overflow hole and the front oil hole, the rear cup is located between the rear overflow hole and the rear oil hole, when the piston is in the pump chamber When moving, the front cup moves and blocks the front overflow hole, the rear cup moves and blocks the rear overflow hole, the oil in the oil cup enters the front oil outlet pipe through the front oil hole and the rear oil hole The front and rear brake calipers are controlled separately in the oil pipe to achieve the purpose of controlling the front and rear brakes. Although this combined brake pump can achieve basic braking, there are the following problems at the same time. Generally, the front and rear brakes of the brake pump need to be synchronized. To achieve front and rear brake synchronization, this kind of brake pump achieves the purpose of front and rear brake synchronization through the different moving distances of the front cup and the rear cup. Because the spring will be worn out and the expansion and contraction ability will be weakened when the spring is used for a long time, the front cup and the rear cup The moving distance of the cup has a great influence, resulting in the asynchronous blocking time of the front overflow hole and the rear overflow hole, so that the front brake and the rear brake cannot be synchronized, and this will cause the vehicle to roll over or flick during driving. danger

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