JPS5872509U

JPS5872509U - Hydraulic cylinder damage prevention device

Info

Publication number: JPS5872509U
Application number: JP16862381U
Authority: JP
Inventors: 恒男高木; 守治武田
Original assignee: オカダ鑿岩機株式会社
Priority date: 1981-11-11
Filing date: 1981-11-11
Publication date: 1983-05-17

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はこの考案を適用した油圧シリンダの縦断面図、
第２図は第１図の要部を拡大して示す断面図、第３図は
この考案の変形例を示す油圧シリンダの縦断面図、第４
図は第３図の要部を拡大して示す断面図、第５図はこの
考案の第３変形例を示す油圧シリンダの要部縦断面図、
第６図はこの考案の第４変形例を示すピストンの要部縦
断面図、第７図ＡーＣはこの考案の第５変形例を示すバ
ルブの縦断面図、第８図はこの考案を適用した油圧シリ
ンダを有する破砕機の縦断面図、第９図は第８図の破砕
機を搭載した状態を示すパワーショベルの側面図である
。２・・・・・・油圧シリンダ、４・・・・・・チューブ
、６・・・・・・ヘッド力バー、８・・・・・・ロッド
カバー、１０・・・・・・ピストン、１２・・・・・・
ピストンロッド、１４・・・・・・締付はボルト、２０
・・・・・・ヘッド側油室、２２・・・・・・ロッド側
油室、２４．２５・・・・・・バルブ、２６・・・・・
・スプール、２８・・・・・・弁押し部、３２・・・・
・・円錐部、３６・・・・・・スプリング、４４・・・
・・・バルブ油室、４６・・・・・・通路。ｌ？Ｆ＼八　　　　　　　　　　　ム／子６図　　（ａｔ　ｉｚσ ″　　踊ｔ　／３１、ｌヂ　ｍ　ヂ゛）　　／〃／９Figure 1 is a longitudinal sectional view of a hydraulic cylinder to which this invention is applied.
2 is an enlarged sectional view of the main part of FIG. 1, FIG. 3 is a vertical sectional view of a hydraulic cylinder showing a modification of this invention, and 4.
The figure is an enlarged sectional view of the main part of Fig. 3, and Fig. 5 is a longitudinal sectional view of the main part of a hydraulic cylinder showing a third modification of this invention.
FIG. 6 is a vertical cross-sectional view of a main part of a piston showing a fourth modification of this invention, FIGS. 7A-C are longitudinal cross-sections of a valve showing a fifth modification of this invention, and FIG. FIG. 9 is a longitudinal sectional view of a crusher having an applied hydraulic cylinder, and FIG. 9 is a side view of a power shovel in which the crusher of FIG. 8 is mounted. 2...Hydraulic cylinder, 4...Tube, 6...Head force bar, 8...Rod cover, 10...Piston, 12・・・・・・
Piston rod, 14...Tighten with bolt, 20
...Head side oil chamber, 22...Rod side oil chamber, 24.25...Valve, 26...
・Spool, 28... Valve push part, 32...
... Conical part, 36 ... Spring, 44 ...
... Valve oil chamber, 46... Passage. l? F \8 M/ Child 6 figure (at izσ ″ dancet /31, l〃 m ゛) /〃 /9

Claims

[Claims for Utility Model Registration] 1. A valve is attached to at least one side wall of the cylinder cover or the side wall of the piston, and the tip of the valve pusher of the valve protrudes from the inner wall surface of the cover or the end surface of the piston,
When the piston approaches the end of its stroke, the valve pusher contacts the piston or cylinder cover and retracts it, causing the high-pressure oil in the cylinder to flow out through the valve to the low-pressure side in order to pull the valve element away from the valve seat. Features a hydraulic cylinder damage prevention device. 2. The device as claimed in claim 1, characterized in that the valve body is pressed against the valve seat by a spring. 3 Using a pair of spools in which the valve pusher and valve body are integrated,
3. The device according to claim 1, wherein each spool is attached to a head cover and a rod cover, respectively, and the oil chambers of both valves are communicated through a passage.