JPH01157071U

JPH01157071U -

Info

Publication number: JPH01157071U
Application number: JP5433488U
Authority: JP
Priority date: 1988-04-22
Filing date: 1988-04-22
Publication date: 1989-10-30
Also published as: JPH0439090Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る流体アクチユエータとし
てマスタシリンダを示した断面図、第２図はその
マスタシリンダの環状シールの一部を拡大して示
した断面図、第３図はそのマスタシリンダの作用
を説明するための部分拡大断面図、第４図は従来
の流体アクチユエータのシール部を示した断面図
、第５図はその環状シールの一部を拡大して示し
た断面図、第６図はその環状シールを備えたマス
タシリンダの作用を示した部分拡大断面図である
。１０……マスタシリンダ、１１……シリンダハ
ウジング、１４，１５……ピストンガイド、１６
，１７……ピストン、１８，１９……圧力室、２
３，２４……通孔、２５，２６……孔、２７，２
８……通路、２９，３０……環状シール、２９ａ
，３０ａ……環状凹部、２９ｂ，３０ｂ……内側
環状部、２９ｃ，３０ｃ……フランジ部、２９ｄ
，３０ｄ……環状突部、３１……オイルリザーバ
、３２，３３……通路、３４，３５……孔。 Fig. 1 is a sectional view showing a master cylinder as a fluid actuator according to the present invention, Fig. 2 is an enlarged sectional view of a part of the annular seal of the master cylinder, and Fig. 3 is an operation of the master cylinder. 4 is a sectional view showing the seal portion of a conventional fluid actuator, FIG. 5 is an enlarged sectional view of a part of the annular seal, and FIG. FIG. 3 is a partially enlarged cross-sectional view showing the operation of the master cylinder equipped with the annular seal. 10... Master cylinder, 11... Cylinder housing, 14, 15... Piston guide, 16
, 17... Piston, 18, 19... Pressure chamber, 2
3,24...through hole, 25,26...hole, 27,2
8... Passage, 29, 30... Annular seal, 29a
, 30a... annular recessed part, 29b, 30b... inner annular part, 29c, 30c... flange part, 29d
, 30d... Annular protrusion, 31... Oil reservoir, 32, 33... Passage, 34, 35... Hole.

Claims

[Scope of utility model registration request]

The pressure chamber is communicated with the reservoir through a through hole formed in the circumferential surface of the piston, the piston is moved inward of the pressure chamber, and the through hole of the piston passes through an annular seal, thereby reducing the pressure. In a fluid actuator that disconnects communication between a chamber and the reservoir and moves the piston inward of the pressure chamber to forcefully transfer fluid in the pressure chamber to an actuated device, the annular seal has one end surface. has an annular recess in the recess, and protrudes inward at a portion of the piston sliding surface of the inner annular wall forming the side wall of the recess, which corresponds to the thick part of the flange forming the bottom wall of the recess. an annular protrusion is formed, and when the annular seal is placed with the annular recess facing into the pressure chamber and the piston is inserted through the annular seal, the annular protrusion presses the piston. A fluid actuator characterized in that the force is greater than that of other parts of the piston sliding surface.