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Master cylinder

一种储液箱、压力室的技术，应用在液压制动传动装置、制动器、运输和包装等方向，能够解决难以提高阀体安装精度等问题，达到提高安装精度的效果

Active Publication Date: 2009-01-28
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this existing master cylinder is structured such that a valve seat member is fixedly installed inside the valve housing hole, and since the valve seat on which the valve body is mounted and the guide portion for freely slidingly guiding the valve body are constituted by separate parts, it is difficult in actual conditions. Improve the installation accuracy of the valve body

Method used

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Embodiment Construction

[0054] Hereinafter, various embodiments of the present invention will be described based on the drawings. In addition, in each embodiment described below, the same code|symbol is attached|subjected to the same part, and repeated description is abbreviate|omitted.

[0055] First, the description of Fig. 1 to Figure 11 The first embodiment shown.

[0056] In the drawings, reference numeral 1 denotes a master cylinder of the present invention, and reference numeral 2 denotes a liquid storage tank mounted on the upper portion of the master cylinder 1 . The master cylinder 1 of this embodiment is applied to a brake device of a vehicle, and supplies hydraulic fluid to a brake circuit in conjunction with a brake operation of a driver's seat. In addition, a control pump (hydraulic device) for traction control (not shown) is provided in the brake circuit, and hydraulic fluid is sucked into the control pump from the master cylinder 1 differently from the driver's brake operation acco...

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PUM

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Abstract

An object of the present invention is to make it possible to easily improve precision with which the valve body is seated on the valve seat of the check valve, and provide a master cylinder which can be easily manufactured and in which high precision is realized. In a master cylinder, a supply passage for supplying operating liquid from a reservoir 2 to a pressure chamber 6 is provided in a cylinder body 3 coupled with the reservoir 2. A bypass passage 37 for bypassing the supply passage and connecting the reservoir 2 and the pressure chamber 6 is further provided, and a check valve 34 adapted to open when a pressure in the pressure chamber 6 is lower than that in the reservoir 2 is disposed in the bypass passage 37. A valve case 38 containing a valve body 41 of the check valve 34 comprises a valve seat 40 which the valve body 41 is seated on and moves away from, and a cylindrical wall 45 for slidably guiding the valve body 41 which are integrally formed as a single member.

Description

technical field [0001] The present invention relates to a master cylinder used in a vehicle braking device and the like. Background technique [0002] In this master cylinder, a piston is slidably fitted in a cylinder body that introduces working fluid from a reservoir tank, and a pressure chamber that pressurizes the working fluid in accordance with the movement of the piston is formed inside the cylinder body. The pressure chamber is connected to a hydraulic device such as a brake device through piping, and operates the hydraulic device in response to the movement of the piston. In addition, in order to prevent the pressure in the pressure chamber from becoming negative pressure during the return operation of the piston, a supply passage for supplying working fluid from the reservoir tank to the pressure chamber is provided in the cylinder body. [0003] In recent years, a traction control system that automatically applies wheel braking force in response to the slipping s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T11/20
CPCB60T11/232
Inventor 荻原贵人木下岳之
Owner HITACHI LTD