JPH01133077U

JPH01133077U -

Info

Publication number: JPH01133077U
Application number: JP2653588U
Authority: JP
Priority date: 1988-02-29
Filing date: 1988-02-29
Publication date: 1989-09-11

Description

[Brief explanation of the drawing]

第１図は本実施例の作動流体の流量制御装置の
全体を示す部分縦断系統図である。第２図および
第３図は第１図における要部の拡大縦断面図であ
る。第４図は従来の作動流体の流量制御装置の全
体を示す縦断系統図である。１１……収納孔、１２……供給通路、２２ａ…
…絞り通路、１３……バイパス通路、２２……流
量調整用スプール弁、２２０ａ……一端開口部、
２２０ｈ……第３弁室、２２０ｍ……第１周壁開
口部、２２０ｎ……第２周壁開口部、２２ａ……
スプール弁本体、２２ｂ……レリーフ弁、３２…
…第１弁室、３３……第２弁室。 FIG. 1 is a partial longitudinal sectional diagram showing the entirety of the working fluid flow rate control device of this embodiment. 2 and 3 are enlarged longitudinal sectional views of the main parts in FIG. 1. FIG. 4 is a longitudinal system diagram showing the entire conventional working fluid flow rate control device. 11... Storage hole, 12... Supply passage, 22a...
... Restriction passage, 13 ... Bypass passage, 22 ... Flow rate adjustment spool valve, 220a ... One end opening,
220h...Third valve chamber, 220m...First circumferential wall opening, 220n...Second circumferential wall opening, 22a...
Spool valve body, 22b... Relief valve, 32...
...first valve chamber, 33...second valve chamber.

Claims

[Claim for Utility Model Registration] A supply passage that receives the supply of pressure oil discharged from the pump, a throttle passage that communicates with the supply passage and sends the pressure oil to the hydraulic device, and a return flow to the suction side of the pump. a bypass passage that adjusts the opening degree from the supply passage to the bypass passage, and a flow rate adjustment spool valve that allows pressure oil to flow from the supply passage to the bypass passage; the spool valve is slidably housed; A first valve chamber communicating with the supply passage on the upstream side of the throttle passage at one end of the housed spool valve and a second valve chamber communicating with the downstream side of the throttle passage at the other end of the spool valve. In the working fluid flow rate control device having a storage hole, the spool valve has an opening at one end that opens into the second valve chamber, a peripheral wall opening that communicates with the bypass passage, and the one end opening and the peripheral wall opening. 3rd communicating
a spool valve body having a valve chamber, a relief valve slidably disposed in the third valve chamber of the spool valve body and opening and closing the one end opening, and the relief valve closing the one end opening. a biasing member that biases the relief valve, a first action surface that applies the fluid pressure in the second valve chamber to the distal end of the relief valve, and a biasing member that biases the fluid pressure in the third valve chamber to the rear end of the relief valve. A working fluid flow rate control device, characterized in that a second working surface is formed on which a fluid pressure of 1 is applied.