JPS6365554U

JPS6365554U -

Info

Publication number: JPS6365554U
Application number: JP15904686U
Authority: JP
Priority date: 1986-10-17
Filing date: 1986-10-17
Publication date: 1988-04-30
Also published as: JPH0334364Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す一部切欠断面
図、第２図はその要部の断面図、第３図はそのリ
テーナの正面図、第４図はそのリテーナの縦断側
面図、第５図はそのリテーナに取り付けられるプ
ロテクタの斜視図、第６図は従来のマスタシリン
ダの一例を示す一部切欠断面図である。２１……シリンダ、２２……リザーバ、２４…
…セコンダリピストン、２７……凹所、２８……
プライマリカツプ（カツプシール）、３２……連
通路、３３……リセス溝、３４……リテーナ、３
４ｃ……環状溝、３４ｄ……環状突起、３５……
バルブ、３７……プロテクタ、３８……リングプ
レート、４０……液圧室、４１……連通溝、４２
……凸部、４３……突起。 Fig. 1 is a partially cutaway sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view of the main part thereof, Fig. 3 is a front view of the retainer, and Fig. 4 is a longitudinal sectional side view of the retainer. FIG. 5 is a perspective view of a protector attached to the retainer, and FIG. 6 is a partially cutaway sectional view showing an example of a conventional master cylinder. 21...Cylinder, 22...Reservoir, 24...
...Secondary piston, 27...Recess, 28...
Primary cup (cup seal), 32... Communication path, 33... Recess groove, 34... Retainer, 3
4c... annular groove, 34d... annular projection, 35...
Valve, 37...Protector, 38...Ring plate, 40...Hydraulic pressure chamber, 41...Communication groove, 42
...Protrusion, 43...Protrusion.

Claims

[Claims for Utility Model Registration] (1) A piston having a cup seal on the outer periphery of its tip and slidably provided in a cylinder, a recess formed at the tip of the piston, and a piston that opens into the recess and a retainer that is fixed to a distal end side of the piston and has a communication groove that communicates between the recess and a hydraulic chamber in the cylinder on its outer periphery; a protector provided between the retainer and the tip of the piston to prevent the cup seal from coming into contact with an edge of a communication groove formed in the retainer; A master cylinder characterized in that it is provided with a valve extending into the recess and opening and closing the communication passage. (2) The protector is provided with an elastically deformable convex portion extending in the diametrical direction of the ring on the inner periphery of the ring, and a protrusion is provided spaced apart from the convex portion in the circumferential direction of the ring, The convex portion is fitted into an annular groove formed in the retainer and is locked to the retainer, and the protrusion is fitted into a groove formed on the inner periphery of the piston and locked to the piston. A master cylinder according to claim 1 of the patented utility model.