JPS5895369U

JPS5895369U - Flow control device for power steering device

Info

Publication number: JPS5895369U
Application number: JP19141881U
Authority: JP
Inventors: 数藤　聰; 隆一山田
Original assignee: 豊田工機株式会社
Priority date: 1981-12-22
Filing date: 1981-12-22
Publication date: 1983-06-28
Also published as: JPH0114542Y2

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図は流量制御装置におけるポンプ回転数に対する流
量特性を示すグラフ、第２図は本考案に係る流量制御装
置の一例を示す断面図、第３図は同流量制御装置の要部
を示す拡大部分断面図、第４図は同流量制御装置におけ
る制御スプールの変位完了状態を示す拡大部分断面図で
ある。符号の説明、１０・・・・・・ポンプハウジング、１１
・・・・・・収納孔、１２・・・・・・供給通路、１３
・・・・・・バイパス通路、２０・・・・・・流量制御
装置、２１・・・・・・ユニオン、２２・・・・・・ス
プール弁、２３・四・制御スプール、２３Ｃ・・・・・
・突起部、２３ｄ・・・・・・環状面、２４・・・・・
・オリフィス形成部材、２４ａ・・・・・・第１オリフ
イス、２４ｂ・・・・・・第２オリフイス、２４ｄ・・
・・・・環状面、３１・・・・・・絞り通路、３２．３
３・・・・・・弁室。Fig. 1 is a graph showing the flow rate characteristics with respect to the pump rotation speed in a flow control device, Fig. 2 is a sectional view showing an example of the flow control device according to the present invention, and Fig. 3 is an enlarged view showing the main parts of the flow control device. FIG. 4 is an enlarged partial sectional view showing a state in which the displacement of the control spool in the same flow rate control device is completed. Explanation of symbols, 10... Pump housing, 11
... Storage hole, 12 ... Supply passage, 13
...Bypass passage, 20...Flow rate control device, 21...Union, 22...Spool valve, 23.4.Control spool, 23C...・・・
・Protrusion, 23d... Annular surface, 24...
- Orifice forming member, 24a...first orifice, 24b...second orifice, 24d...
...Annular surface, 31... Throttle passage, 32.3
3... Valve chamber.

Claims

[Scope of utility model registration request]

An orifice forming member interposed in a supply passage for feeding working fluid supplied from a fluid pump to a power steering device; a flow rate adjustment spool valve that is displaced to adjust the opening of a bypass passage that returns surplus working fluid to the suction side of the fluid pump;
and a throttle passage is formed upstream of the orifice in the supply passage, and a control spool that is displaced according to the pressure difference generated before and after the throttle passage is disposed coaxially on the upstream side of the orifice. In the control device, a step is formed at the shaft end of the control spool to form a protrusion facing the orifice of the orifice forming member and having an outer diameter smaller than that, and an annular surface facing the orifice surrounding surface of the orifice forming member. and an opening that forms a second orifice when the protrusion of the step protrudes into the orifice and the annular surface of the step abuts the peripheral surface of the orifice due to displacement of the control spool. A flow control device for a power steering device, characterized in that an orifice forming member or a contact portion between the orifice forming member and the stepped portion is provided.