JPS59141205U

JPS59141205U - Protection circuit of hydraulic cylinder cushioning device

Info

Publication number: JPS59141205U
Application number: JP3448983U
Authority: JP
Inventors: 黒島　一雄; 克己冨岡; 雅一井上; 隆博小林; 平川　浩己
Original assignee: 株式会社ナブコ; 株式会社神戸製鋼所
Priority date: 1983-03-10
Filing date: 1983-03-10
Publication date: 1984-09-20

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 the drawing]

第１図はクッション装置を有する油圧シリンダの縦断面
図、第２図は第１図の部分拡大縦断面図、第３図はこの
考案の油圧シリンダのクッション装置の保護回路の第１
の実施例の油圧回路図、第４図はこの考案の油圧シリン
ダのクッション装置の保護回路の第２の実施例の油圧回
路図をそれぞれ示す。２・・・油圧シリンダ、３．１０・・・シリンダ室、４
・・・ピストン、６．１１・・・油日、１２．１３・・
・油圧回路、１７・・・リリーフバルブ、１８・・・油
圧制御回路、１９・・・クッションバルブ。FIG. 1 is a vertical cross-sectional view of a hydraulic cylinder having a cushion device, FIG. 2 is a partially enlarged vertical cross-sectional view of FIG. 1, and FIG.
FIG. 4 shows a hydraulic circuit diagram of the second embodiment of the protection circuit for the cushion device of the hydraulic cylinder of this invention. 2... Hydraulic cylinder, 3.10... Cylinder chamber, 4
... Piston, 6.11... Oil day, 12.13...
- Hydraulic circuit, 17... Relief valve, 18... Hydraulic control circuit, 19... Cushion valve.

Claims

[Scope of utility model registration request]

When the piston reaches near the end of its stroke, until it reaches the final end of its stroke, it provides a cushioning effect to the piston by restricting the flow rate of oil discharged from the cylinder chamber on the side in the direction of piston movement. In a hydraulic cylinder having a cushioning device, a hydraulic control circuit equipped with a relief valve connects the cylinder chamber on the side where the cushioning device is installed and the hydraulic circuit on the side that discharges oil during the cushioning action. Cushion device protection circuit.