JPH0284915U

JPH0284915U -

Info

Publication number: JPH0284915U
Application number: JP16232188U
Authority: JP
Priority date: 1988-12-13
Filing date: 1988-12-13
Publication date: 1990-07-03

Description

[Brief explanation of drawings]

第１〜３図は本考案に係る液圧制御弁の一実施
例を示す図であり、第１図はその正面断面図、第
２図はそのスプールのストロークに対する各ポー
トの開口面積の変化を示す特性図、第３図はその
流量と差圧の関係を示す特性図、第４〜７図は従
来の液圧制御弁を示す図であり、第４図はその正
面断面図、第５図はその要部断面図、第６図はそ
のスプールのストロークに対する各ポートの開口
面積の変化を示すその特性図、第７図はシステム
の応答性を示すその特性図である。２１……バルブハウジング、２２……バルブ室
、２３……１次圧ポート、２４……２次圧ポート
、２５……ドレインポート、２６……スプール、
２７……調圧室、２８……フイードバツク室、３
２……絞り部。 Figures 1 to 3 are diagrams showing an embodiment of the hydraulic control valve according to the present invention. Figure 1 is a front sectional view thereof, and Figure 2 shows changes in the opening area of each port with respect to the stroke of the spool. FIG. 3 is a characteristic diagram showing the relationship between flow rate and differential pressure, FIGS. 4 to 7 are diagrams showing a conventional hydraulic pressure control valve, FIG. 4 is a front sectional view thereof, and FIG. 6 is a sectional view of the main part thereof, FIG. 6 is a characteristic diagram showing changes in the opening area of each port with respect to the stroke of the spool, and FIG. 7 is a characteristic diagram showing the responsiveness of the system. 21... Valve housing, 22... Valve chamber, 23... Primary pressure port, 24... Secondary pressure port, 25... Drain port, 26... Spool,
27...Pressure control room, 28...Feedback room, 3
2... Aperture section.

Claims

[Scope of utility model registration request]

A hydraulic control valve that regulates primary pressure input to a primary pressure port according to a command pressure and outputs it as secondary pressure from the secondary pressure port, the primary pressure port and the secondary pressure port being open. A valve housing is provided with a valve housing formed with a valve chamber and a drain port opening into the valve chamber, and is slidably housed in the valve chamber so as to define a pressure regulating chamber and a feedback chamber communicating with the secondary pressure port. A hydraulic control valve comprising: a spool capable of receiving pressure and communicating the pressure regulation chamber with the primary pressure port, and receiving pressure of the feedback chamber and communicating the pressure regulation chamber with the drain port; has a constriction part that slides inside the valve chamber to vary the opening degree of the secondary pressure port, and in response to command pressure, communicates the pressure regulating chamber with the primary pressure port, and also uses the constriction part to control the secondary pressure. A hydraulic control valve characterized by reducing the opening degree of a port.