Compensation hole and center valve type brake master cylinder opening sealing structure

Abstract

The invention relates to a compensation hole and center valve type brake master cylinder opening sealing structure and belongs to the technical field of automobile braking systems. The inner end of a first piston is slidably connected with a master cylinder body by virtue of a first contact point and a second contact point; an oil inlet hole of the master cylinder body is positioned between the first contact point and the second contact point; a sealing ring groove is formed in the master cylinder body which is in sliding connection with the second contact point of the first piston; the outer lip of a secondary cup is hermetically connected with the sealing ring groove, and the inner lip of the secondary cup is hermetically connected with the outer diameter of the second contact point of the first piston. The sealing structure disclosed by the invention has the advantages that the structure is novel, the quantity of parts is small, the probability of a failure mode occurring is reduced, and the operational performance of the product is greatly improved; the first piston is contacted with the master cylinder body through the two contact points, and the guide distance of the first piston during moving is long, so that the motion performance of the product is stable, the sealing characteristics of the compensation hole and center valve type brake master cylinder opening are further optimized, the product sealing performance is effectively improved, and the product weight is lightened.

Description

technical field [0001] The invention belongs to the technical field of automobile brake systems, and is an improvement to the existing sealing structure of a compensation hole and a center valve type brake master cylinder mouth. Background technique [0002] The existing sealing parts used for the compensation hole of the automobile brake and the mouth of the central valve brake master cylinder include: butterfly reeds, retaining rings, O-shaped sealing rings, auxiliary cups, limit rings and spring retaining rings. The sealing parts form a mouth sealing structure with the master cylinder and the first piston. Since there are many sealed parts, once one of the parts is damaged, the brake fluid will flow from the brake master cylinder to the booster, resulting in brake failure. Loss of dynamic fluid, brake failure, seriously endangering life and safety; and the contact between the first piston and the main cylinder is short and only one, which makes the guiding distance short,...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a sealing structure of a compensation hole and a central valve type brake master cylinder mouth to solve the problem that there are many sealed parts and are easily damaged, and the contact between the first piston and the master cylinder is short and is one , so that the guide distance is short, resulting in unstable motion performance of the product, thus affecting the sealing performance

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