JPS63141305U

JPS63141305U -

Info

Publication number: JPS63141305U
Application number: JP3335587U
Authority: JP
Priority date: 1987-03-06
Filing date: 1987-03-06
Publication date: 1988-09-19

Description

[Brief explanation of the drawing]

第１図は第３図の要部拡大図である。第２図は
第３図のピストンシールの要部拡大図であつて、
取付前の状態を示す図である。第３図は本考案が
適用されたピストンシールを有するホイールシリ
ンダを備えたドラムブレーキの要部を示す正面図
であつて、一部を断面にして示す図である。２２：ホイールシリンダ（液圧シリンダ）、２
６：シリンダボア、３０：ピストン、３４：環状
溝、３６：ピストンシール、３８：内周側リング
部、４０：外周側リング部、４２：連結部。 FIG. 1 is an enlarged view of the main part of FIG. 3. FIG. 2 is an enlarged view of the main parts of the piston seal shown in FIG.
It is a figure which shows the state before attachment. FIG. 3 is a front view showing the main parts of a drum brake equipped with a wheel cylinder having a piston seal to which the present invention is applied, and is a partially sectional view. 22: Wheel cylinder (hydraulic cylinder), 2
6: cylinder bore, 30: piston, 34: annular groove, 36: piston seal, 38: inner ring section, 40: outer ring section, 42: connection section.

Claims

[Claims for Utility Model Registration] In a hydraulic cylinder in which a piston is slidably fitted into a cylinder bore, the annular groove formed on the outer peripheral surface of the piston and the inner peripheral surface of the cylinder bore form an annular shape. A piston seal that fluid-tightly seals between the outer circumferential surface of the piston and the inner circumferential surface of the cylinder bore by being installed in a pinched state between the two pistons, the inner circumferential surface of which is brought into pressure contact with the bottom of the annular groove. an inner circumferential ring portion; and an outer circumferential side having an axial length smaller than the width of the annular groove and provided on the outer circumferential side of the inner circumferential ring portion, the outer circumferential surface of which is brought into pressure contact with the inner circumferential surface of the cylinder bore. A piston seal for a hydraulic cylinder, comprising: a ring portion; and a connecting portion that connects the inner ring portion and the outer ring portion to each other at an axially intermediate portion thereof.