JPS5942751U

JPS5942751U - master cylinder

Info

Publication number: JPS5942751U
Application number: JP13811382U
Authority: JP
Inventors: 中洲　啓; 木崎　二郎
Original assignee: トヨタ自動車株式会社
Priority date: 1982-09-11
Filing date: 1982-09-11
Publication date: 1984-03-21

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は、従来のマスクシリンダの要部断面図である。第２図は一本考案の一実施例の要部を示す一部を切欠い
た断面図である。３２：マスタシリンダ、３４：ハウジング、３６：シリ
ンダボア、３８：ピストン、４０：加圧室、４２：補償
室、４４：小径ピストン部、（ピストン部）、４６：大
径ピストン部（ピストン部）、５２：有底円穴（通路）
、６０ニガイド穴、６４：バルブガイド（弁座）、６８
：開閉弁子、７０：作用突起、７８：皿ばね（スプリン
グ）、７９：傾斜面。第１図第２図−FIG. 1 is a sectional view of a main part of a conventional mask cylinder. FIG. 2 is a partially cutaway sectional view showing the main parts of an embodiment of the present invention. 32: Master cylinder, 34: Housing, 36: Cylinder bore, 38: Piston, 40: Pressure chamber, 42: Compensation chamber, 44: Small diameter piston section, (Piston section), 46: Large diameter piston section (Piston section), 52: Bottomed circular hole (passage)
, 60 guide hole, 64: Valve guide (valve seat), 68
: Opening/closing valve element, 70: Working protrusion, 78: Disc spring (spring), 79: Inclined surface. Figure 1 Figure 2-

Claims

[Claims for Utility Model Registration] A housing provided with a cylinder bore, a pressurizing chamber that is fluid-tightly fitted into the cylinder bore to generate brake fluid pressure in the cylinder bore, and a pressurizing chamber that generates brake fluid pressure in the pressurizing chamber. a piston comprising piston portions each forming a compensation chamber to be compensated; a reservoir tank supplying brake fluid to the compensation chamber;
In a mask cylinder equipped with an opening/closing device that opens a passage connecting the compensation chamber and a reservoir tank when the piston is in a non-operating position, the opening/closing device is configured to include an opening/closing valve element that opens and closes the passage, and the opening/closing valve element. a valve seat on which the valve is seated, and a valve seal made of an elastic body attached to the opening/closing valve element and/or the valve seat; - an operating protrusion protruding from the opening/closing valve element into the compensation chamber; a guide hole in which the operating protrusion is slidably fitted and guides the opening/closing valve element in the axial direction of the operating protrusion; a spring that seats the valve element on the valve seat; and a spring that is provided on the piston and acts on the tip of the operating protrusion in the vicinity of the non-operating position of the piston, so that the piston is not close to the non-operating position (accordingly, the opening/closing valve is closed). an inclined surface for moving the valve element against the biasing force of the spring, so that when the opening/closing device is opened, the opening/closing valve element and the valve seat are reliably separated over the entire circumference. A mask cylinder characterized by: