JPS6424706U

JPS6424706U -

Info

Publication number: JPS6424706U
Application number: JP11957087U
Authority: JP
Priority date: 1987-08-04
Filing date: 1987-08-04
Publication date: 1989-02-10

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る油圧シリンダ
の縦断正面図、第２図、第３図は伸長作動時の一
部切欠き断面図、第４図、第５図は従来の油圧シ
リンダの縦断正面図である。１１……シリンダ、１２……ピストン、１２ａ
……バルブボデイ、１３……ピストンロツド、１
７……スプール、１８……スペーサ、１９……チ
エツク弁、２０……通路、Ａ……反ロツド側室、
Ｂ……ロツド側室、Ｔ……タンク、Ｐ……油圧源
、ａ，ｂ，ｃ，ｄ……オリフイス。 Fig. 1 is a longitudinal sectional front view of a hydraulic cylinder according to an embodiment of the present invention, Figs. 2 and 3 are partially cutaway sectional views during extension operation, and Figs. 4 and 5 are conventional hydraulic cylinders. FIG. 11...Cylinder, 12...Piston, 12a
... Valve body, 13 ... Piston rod, 1
7... Spool, 18... Spacer, 19... Check valve, 20... Passage, A... Anti-rod side chamber,
B... Rod side chamber, T... Tank, P... Hydraulic source, a, b, c, d... Orifice.

Claims

[Claims for Utility Model Registration] (1) A piston rod is movably inserted into the cylinder via a piston, the piston divides the cylinder into a rod-side chamber and an anti-rod side chamber, and the rod-side chamber is always connected to the tank; In a hydraulic cylinder, the side chamber opposite to the rod is connected to a hydraulic power source, and the cushion is activated near the end of the piston rod.
A hollow spacer is provided in the cylinder, a hollow spool is movably inserted into the spacer, a plurality of orifices are formed in the spool in the radial direction, and a valve body is provided in the upper part of the piston. A hydraulic cylinder that is provided with a passage that opens at the top and bottom of the valve body and a check valve that opens and closes this passage. (2) When the valve body comes into contact with the spool during extension, the amount of oil in the chamber partitioned inside the spool and spacer is always increased compared to the amount of oil in the rod side chamber partitioned around the spool's outer circumference when the spool is fully extended. 1. A hydraulic cylinder according to claim 1, which is designed as a utility model. (3) The hydraulic cylinder according to claim 1, wherein the spool is always urged downward by a return spring. (4) The hydraulic cylinder according to claim 1, wherein the spacer is a part of the cylinder or cylinder head. (5) The hydraulic cylinder according to claim 1, wherein the valve body is constituted by a part of the piston.