JPH0362202U

JPH0362202U -

Info

Publication number: JPH0362202U
Application number: JP12418189U
Authority: JP
Priority date: 1989-10-24
Filing date: 1989-10-24
Publication date: 1991-06-18

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの考案の一実施例の弁閉鎖状態を示
す縦断面図、第２図は同じくその弁開放状態を示
す縦断面図、第３図はこの考案によるスプール弁
を用いた保護油圧回路の一例を示す回路図、第４
図は第１図に示した実施例の絞りに異物が詰まつ
た状態を示す縦断面図、第５図は従来のノズル・
フラツパ式スプール弁を例示する縦断面図、第６
図は同じくそのノズルに異物が詰まつた状態を示
す縦断面図、第７図はそのスプール弁を用いた油
圧回路の一例を示す回路図である。１……弁ボデー、２……摺動孔、３……スプー
ル、７……ノズル、８……比例ソレノイド（アク
チユエータ）、９……フラツパ、１２……減圧弁
、１３……絞り、２０……ノズル・フラツパ式ス
プール弁、２１……位置センサ、３０……圧油源
、３１……シリンダ、３２……ピストン、３３…
…タンク、３４……負荷、３５……電磁切換弁、
４０……制御装置、Ｄ……異物。 Fig. 1 is a longitudinal sectional view showing an embodiment of this invention in a valve closed state, Fig. 2 is a longitudinal sectional view showing the valve in an open state, and Fig. 3 is a protective hydraulic circuit using a spool valve according to this invention. Circuit diagram showing an example of 4th
The figure is a longitudinal cross-sectional view showing the state in which the orifice of the embodiment shown in Figure 1 is clogged with foreign matter, and Figure 5 is a longitudinal sectional view of the conventional nozzle.
Vertical sectional view illustrating a flap type spool valve, No. 6
The figure is a longitudinal cross-sectional view showing a state in which the nozzle is clogged with foreign matter, and FIG. 7 is a circuit diagram showing an example of a hydraulic circuit using the spool valve. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Sliding hole, 3... Spool, 7... Nozzle, 8... Proportional solenoid (actuator), 9... Flutter, 12... Pressure reducing valve, 13... Throttle, 20... ...Nozzle/flap type spool valve, 21...Position sensor, 30...Pressure oil source, 31...Cylinder, 32...Piston, 33...
... Tank, 34 ... Load, 35 ... Solenoid switching valve,
40...Control device, D...Foreign object.

Claims

【実用新案登録請求の範囲】一方向へ押圧したスプールの先端に突設したノ
ズルとアクチユエータのブツシユロツドに取り付
けたフラツパとを対向配置し、絞りを介してノズ
ル・フラツパ間に導入した油圧により前記スプー
ルに前記押圧力と逆方向の力を作用させて、該ス
プールを前記フラツパに追従して変位させるよう
にしたノズル・フラツパ式スプール弁において、前記スプールの後方に、該スプールの所定スト
ローク範囲外への移動を検出し得る位置センサを
設けたことを特徴とするノズル・フラツパ式スプ
ール弁。[Claims for Utility Model Registration] A nozzle protruding from the tip of a spool that is pressed in one direction and a flapper attached to the bushing rod of the actuator are arranged facing each other, and hydraulic pressure introduced between the nozzle and the flapper through a throttle causes the spool to In a nozzle/flapper type spool valve, the spool is displaced to follow the flapper by applying a force in the opposite direction to the pressing force to the rear of the spool, out of a predetermined stroke range of the spool. A nozzle/flap type spool valve characterized by being provided with a position sensor capable of detecting movement of the nozzle/flap type spool valve.