JPS6170663U

JPS6170663U -

Info

Publication number: JPS6170663U
Application number: JP15587484U
Authority: JP
Priority date: 1984-10-15
Filing date: 1984-10-15
Publication date: 1986-05-14
Also published as: JPH0221659Y2

Description

[Brief explanation of the drawing]

第１図はこの考案によるカウンタバランス弁の
１実施例の縦断面図、第２図は同実施例の横断面
図、第３図は同実施例のストロークと開口面積と
の関係を示す図、第４図は同実施例のストローク
と絞りとの関係を示す図、第５図は従来のカウン
タバランス弁の回路図である。３０……弁体、３２……内孔、３４，３６……
アクチユエータ流路、３８，４０……圧油給排流
路、４８……スプール、５０，５２……室、５４
，５６……ばね、５８，６０……逆止弁、６２，
６４……制御ランド、６６，６８……ノツチ、７
０，７４……第１絞り、８２，８４……第２絞り
、９０，９２……第１切欠、９４，９６……第２
切欠。 FIG. 1 is a longitudinal cross-sectional view of one embodiment of the counterbalance valve according to this invention, FIG. 2 is a cross-sectional view of the same embodiment, and FIG. 3 is a diagram showing the relationship between the stroke and opening area of the same embodiment. FIG. 4 is a diagram showing the relationship between stroke and throttle in the same embodiment, and FIG. 5 is a circuit diagram of a conventional counterbalance valve. 30... Valve body, 32... Inner hole, 34, 36...
Actuator channel, 38, 40... Pressure oil supply/discharge channel, 48... Spool, 50, 52... Chamber, 54
, 56... Spring, 58, 60... Check valve, 62,
64... Control land, 66, 68... Notsuchi, 7
0,74...first aperture, 82,84...second aperture, 90,92...first notch, 94,96...second
Notch.

Claims

[Scope of utility model registration request]

A pressure oil supply/discharge channel and an actuator channel are provided in the valve body, and a spool insertion hole is formed in the valve body,
A spool equipped with a check valve is slidably fitted into this spool fitting hole, and the spool is urged to a neutral position by springs provided at both ends, and is placed between the chamber and the pressure oil supply/discharge passage. In a counterbalance valve including a check valve and a first throttle, a passage is provided that opens in the spool insertion hole and is connected to the pressure oil supply/discharge passage, and a second throttle is interposed in this passage, and the spool a control land having a notch connecting the pressure oil supply and discharge flow path and the actuator flow path;
When the spool slides from the neutral position to the switching position, the spool is moved in the sliding direction until it reaches a position where the notch in the sliding direction connects with the pressure oil supply/discharge passage with the first opening area. a first notch connecting the chamber to the pressure oil supply/drainage channel via first and second throttles; and a notch in the sliding direction connecting the chamber in the return direction when the spool returns from the switching position to the neutral position. and a second notch connected to the pressure oil supply and discharge passage through first and second throttles to a position where the pressure oil supply and discharge passage is connected to the pressure oil supply and discharge passage through a second opening area. A counterbalance valve installed in.