JPH0462964U

JPH0462964U -

Info

Publication number: JPH0462964U
Application number: JP10484990U
Authority: JP
Priority date: 1990-10-04
Filing date: 1990-10-04
Publication date: 1992-05-28

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例を示すピストン部
の縦断面図、第２図は第１図のピストンシール部
の圧力勾配と接触面圧分布図、第３図は第１図の
ピストンシールの変形例を示す縦断面図、第４図
は第３図のピストンシール部の接触面圧分布図、
第５図は本考案の第２実施例を示すピストン部の
縦断斜視図、第６図、第７図はそれぞれ第５図の
サポートリングの変形例を示す縦断斜視図である
。第８図は従来の液圧シリンダーを示す全体縦断
面図、第９図、第１０図はそれぞれ第８図のピス
トンシールを示す部分拡大図、第１１図、第１２
図はそれぞれ従来のピストンシールを示す縦断面
図、１……シリンダーロツド、２……ピストン、３
，３ａ，３ｂ，３ｃ，３ｄ……ピストンシール、
４……バツクリング、６……シリンダーチユーブ
、８，８ａ，８ｂ……サポートリング、ｄ_１，ｄ
Ｓ……端面外径、ｄ……ピストン外径、ｈ，ｈ_１……すきま、ｈｍ……液膜厚さ、θ……圧力勾配
、Ｐ……接触面圧、Ｒ，Ｒ_１……半径、Ｋ……カ
ツト切欠部、Ｓ……接触部端面、Ｈ……はみ出し
。 Fig. 1 is a vertical sectional view of the piston section showing the first embodiment of the present invention, Fig. 2 is a pressure gradient and contact surface pressure distribution diagram of the piston seal section of Fig. 1, and Fig. 3 is a diagram of the piston shown in Fig. 1. A vertical sectional view showing a modification of the seal, FIG. 4 is a contact surface pressure distribution diagram of the piston seal portion of FIG. 3,
FIG. 5 is a longitudinal sectional perspective view of a piston portion showing a second embodiment of the present invention, and FIGS. 6 and 7 are longitudinal sectional perspective views showing modifications of the support ring shown in FIG. 5, respectively. FIG. 8 is an overall vertical sectional view showing a conventional hydraulic cylinder, FIGS. 9 and 10 are partially enlarged views showing the piston seal in FIG. 8, and FIGS. 11 and 12, respectively.
The figures are longitudinal cross-sectional views showing conventional piston seals, 1... cylinder rod, 2... piston, 3
, 3a, 3b, 3c, 3d... piston seal,
4... Back ring, 6... Cylinder tube, 8, 8a, 8b... Support ring, d ₁ , d
S... End surface outer diameter, d... Piston outer diameter, h, h ₁ ...Gap, hm...Liquid film thickness, θ...Pressure gradient, P...Contact surface pressure, R, _R1 ...Radius, K...Cut notch, S...Contact part end surface, H... Protruding.

Claims

[Scope of utility model registration request]

In a piston in which a soft annular piston seal whose outer periphery slides into contact with the inner surface of a cylinder tube via an elastic back ring is inserted into an annular groove with a rectangular cross section recessed in the outer periphery of the piston, the cross section of the outer periphery of the annular piston seal is A hydraulic piston seal structure, characterized in that the piston is formed into an arc that projects slightly outward from both ends, and the outer diameter of each of the ends is slightly smaller than the outer diameter of the piston.