CN202345666U

CN202345666U - Rear brake cylinder internally provided with proportional valve

Info

Publication number: CN202345666U
Application number: CN2011204288912U
Authority: CN
Inventors: 陶能玉; 陆锐; 罗亚军; 许亮; 王大胜
Original assignee: WUHU ZHONGFA AUTOMOBILE BRAKE SYSTEM CO Ltd
Current assignee: WUHU ZHONGFA AUTOMOBILE BRAKE SYSTEM CO Ltd
Priority date: 2011-11-03
Filing date: 2011-11-03
Publication date: 2012-07-25
Anticipated expiration: 2021-11-03

Abstract

The utility model discloses a rear brake cylinder internally provided with a proportional valve. The rear brake cylinder comprises a cylinder body which is provided with an oil chamber internally, the cylinder body is provided with an oil inlet hole and an air bleed hole which are communicated with the oil chamber, the oil bleed hole is vertically arranged on the outer wall of the cylinder body, the oil chamber is internally provided with an auxiliary piston and a main piston, leather collars are sleeved outside both the auxiliary piston and the main piston, both the rear end of the auxiliary piston and the front end of the main piston are clamped with an elastic protection cover, a counterbore is arranged in the main piston and is internally provided with the proportional valve and a small piston, the small piston is provided with a step, a spring is cushioned between the step on the small piston and the bottom of the counterbore, a steel ball is placed in the proportional valve, a small spring is cushioned between the steel ball and a valve cavity, and an L-shaped valve rod arranged on a valve plug is fixedly mounted with the steel ball. As a dustproof cover is arranged at the upper end of the piston, the leather collars are arranged on the side of the piston, and a dustproof plug is arranged in the oil inlet, dust and air can be effectively prevented from entering the oil chamber, and the brake cylinder can be guaranteed to be used for a long time without causing any problem.

Description

A kind of rear braking subpump of built-in apportioning valve

Technical field

The utility model relates to brake pump field behind the automobile, relates in particular to a kind of wheel cylinder of built-in apportioning valve.

Background technology

Brake cylinder is the indispensable part of brake system, and its significant feature is to push brake facing, and brake facing friction brake drum makes speed of a motor vehicle reduction and static.Step on brake back master cylinder generation thrust hydraulic oil is overwhelmed brake cylinder, under the pressure of pump housing piston, brake oil pipe is extruded oil pipe and makes braking function to each wheel cylinder diffluence.When the releasing of brake plate.Oil outlet in the master cylinder can be closed, and oil inlet is opened, and brake solution is back in the master cylinder from each wheel cylinder, gets back to virgin state.Brake cylinder structure in the past, its cylinder body are the structure design that the top directly has oil inlet mostly, and this kind structure does not have dust keeper, and long-term use lets dust and moisture get into cylinder body easily, causes faults such as seizure of piston and leakage of oil.Therefore imagination provides a kind of equipment to solve this problem.

The utility model content

The purpose of the utility model just provides the built-in apportioning valve formula that a kind of oil inlet has dust keeper and divides pump assembly; Solve brake cylinder structure in the past; Its cylinder body is the structure design that the top directly has oil inlet mostly; This kind structure does not have dust keeper, and long-term use lets dust and moisture get into cylinder body easily, causes the problem of faults such as seizure of piston and leakage of oil.

For solving the problems of the technologies described above, the technical scheme of the utility model is following:

A kind of rear braking subpump of built-in apportioning valve includes cylinder body, has the grease chamber in the described cylinder body, has the fuel feed hole and the air bleed hole that communicate with the grease chamber on the cylinder body; Described air bleed hole is horizontally through on the outer wall of cylinder block; Auxiliary piston and main piston are installed in the described grease chamber, and auxiliary piston and main piston are respectively installed with apron outward, and the rear end of auxiliary piston and the front end of main piston all are installed with the elasticity protective cover; Have counter sink in the described main piston, be slidingly fitted with valve piston in the counter sink, valve piston is provided with step, is equipped with spring between at the bottom of the step on the valve piston and the hole of counter sink; The front end of valve piston has valve pocket; The front end of valve pocket is equipped with valve seat; Be placed with steel ball in the valve pocket, be equipped with little spring between steel ball and the valve pocket, have valve port, the oil outlet that communicates with valve pocket on valve seat, valve piston sidewall, the main piston sidewall; Valve port and steel ball are complementary, and the valve port on the valve piston sidewall is positioned at the proceeds posterolateral of steel ball.

In the described counter sink circlip for bore is installed; The described steel ball outside is supported with L shaped strut member, and strut member is fixed by circlip for bore.

Compared with prior art, the beneficial effect of the utility model is:

The utility model passes through in the piston upper end dust boot to be installed, and at the piston side sealing apron is installed, and the while is equipped with dust plug in oil inlet, can effectively prevent dust and air admission grease chamber, has guaranteed that long-time use of brake cylinder can not go wrong yet.

Description of drawings

Fig. 1 is the integral structure scheme drawing of the utility model.

The specific embodiment

Below in conjunction with accompanying drawing, the utility model is done further detailed explanation:

Referring to accompanying drawing, a kind of rear braking subpump of built-in apportioning valve includes cylinder body 1, has the grease chamber in the cylinder body 1, has the fuel feed hole 12 and the air bleed hole that communicate with the grease chamber on the cylinder body; Air bleed hole is horizontally through on the outer wall of cylinder block; Auxiliary piston 2 and main piston 3 are installed in the described grease chamber, and auxiliary piston and main piston are respectively installed with apron 4 outward, and the rear end of auxiliary piston and the front end of main piston all are installed with elasticity protective cover 5; Have counter sink in the described main piston, be slidingly fitted with valve piston in the counter sink, valve piston is set with cuticle circle 8 outward, and valve piston is provided with step, is equipped with spring 9 between at the bottom of the step on the valve piston and the hole of counter sink; The front end of valve piston has valve pocket; The front end of valve pocket is equipped with valve seat, is placed with steel ball 10 in the valve pocket, is equipped with little spring 11 between steel ball 10 and the valve pocket; Have valve port, the oil outlet that communicates with valve pocket on valve seat, valve piston sidewall, the main piston sidewall; Valve port and steel ball are complementary, and the valve port on the valve piston sidewall is positioned at the proceeds posterolateral of steel ball, and circlip for bore 6 is installed in the counter sink; The steel ball outside is supported with L shaped strut member 7, and strut member 7 is fixed by circlip for bore.

Claims

1. the rear braking subpump of a built-in apportioning valve includes cylinder body, it is characterized in that: have the grease chamber in the described cylinder body, have the fuel feed hole and the air bleed hole that communicate with the grease chamber on the cylinder body; Described air bleed hole is horizontally through on the outer wall of cylinder block; Auxiliary piston and main piston are installed in the described grease chamber, and auxiliary piston and main piston are respectively installed with apron outward, and the rear end of auxiliary piston and the front end of main piston all are installed with the elasticity protective cover; Have counter sink in the described main piston, be slidingly fitted with valve piston in the counter sink, valve piston is provided with step, is equipped with spring between at the bottom of the step on the valve piston and the hole of counter sink; The front end of valve piston has valve pocket; The front end of valve pocket is equipped with valve seat; Be placed with steel ball in the valve pocket, be equipped with little spring between steel ball and the valve pocket, have valve port, the oil outlet that communicates with valve pocket on valve seat, valve piston sidewall, the main piston sidewall; Valve port and steel ball are complementary, and the valve port on the valve piston sidewall is positioned at the proceeds posterolateral of steel ball.

2. according to the rear braking subpump of the described built-in apportioning valve of claim 1, it is characterized in that: in the described counter sink circlip for bore is installed; The described steel ball outside is supported with L shaped strut member, and strut member is fixed by circlip for bore.