JPS6421826U

JPS6421826U -

Info

Publication number: JPS6421826U
Application number: JP11650987U
Authority: JP
Priority date: 1987-07-29
Filing date: 1987-07-29
Publication date: 1989-02-03

Description

[Brief explanation of the drawing]

第１図は、この考案のシール部の一例を示す断
面図、第２図はその加圧時の作用説明用断面図、
第３図はリアクシヨンリングの変形例を示す断面
図、第４図はピストンシール単独で液封を行う従
来のシール部を示す断面図で同図のイが除圧状態
、ロが加圧状態の図、第５図はバツクアツプリン
グを追加した従来のシール部の除圧状態の断面図
である。１……シリンダ、２……ピストン、３……ピス
トンシール、４……バツクアツプリング、５……
リアクシヨンリング、５ａ……空隙、７……組付
け溝、７ａ……リング溝。 Fig. 1 is a cross-sectional view showing an example of the sealing part of this invention, Fig. 2 is a cross-sectional view for explaining its action when pressurized,
Figure 3 is a sectional view showing a modified example of the reaction ring, and Figure 4 is a sectional view showing a conventional seal that seals liquid with a piston seal alone. FIG. 5 is a cross-sectional view of a conventional seal portion in which a back-up spring is added in a depressurized state. 1...Cylinder, 2...Piston, 3...Piston seal, 4...Backup spring, 5...
Reaction ring, 5a... air gap, 7... assembly groove, 7a... ring groove.

Claims

[Scope of utility model registration request]

In the annular assembly groove between the piston, which needs to be moved back a certain amount from the forward position when the hydraulic fluid is depressurized, and the cylinder into which it is inserted, from the hydraulic fluid side, a piston seal, a back-up spring for the seal, and a reaction ring are installed. are arranged in this order, and furthermore, the reaction ring is configured to have a cross-sectional shape that forms an arbitrary gap between it and the ring groove in which the reaction ring is housed, so as to allow the back-up spring to deflect toward the reaction ring side. The sealed part of the piston.