JPS62149602U

JPS62149602U -

Info

Publication number: JPS62149602U
Application number: JP3711786U
Authority: JP
Priority date: 1986-03-14
Filing date: 1986-03-14
Publication date: 1987-09-22
Also published as: JPH0438087Y2

Description

[Brief explanation of the drawing]

第１図ないし第５図は本考案の第１の実施例を
示し、第１図は圧力制御弁を示す縦断面図、第２
図は第１図中の矢示―方向断面図、第３図は
第１図中に示すスプールの要部外観図、第４図は
第３図中の矢示―方向断面図、第５図は第１
図に示す圧力制御弁の特性線図、第６図ないし第
８図は本考案の第２の実施例を示し、第６図は第
４図と同様の要部外観図、第７図は第６図中の矢
示―方向断面図、第８図は第５図と同様の特
性線図、第９図ないし第１２図は従来技術を示し
、第９図はブレーキ弁を示す油圧回路図、第１０
図は第９図中に示す圧力制御弁の縦断面図、第１
１図は第１０図中の矢示―方向断面図、
第１２図は第１０図に示す圧力制御弁の特性線図
である。１１…圧力制御弁、１２…弁本体、１３Ａ，１
３Ｂ…油圧源側ポート、１４Ａ，１４Ｂ…アクチ
ユエータ側ポート、１５…スプール摺動穴、１６
Ａ，１６Ｂ，１７Ａ，１７Ｂ…油溝、１９Ａ，１
９Ｂ…油室、２４Ａ，２４Ｂ…ストツパ、２５Ａ
，２５Ｂ…ばね、４０…スプール、４１，４２Ａ
，４２Ｂ，４３Ａ，４３Ｂ…ランド、４４Ａ，４
４Ｂ…面取り部、４５Ａ，４５Ｂ，４６Ａ，４６
Ｂ…絞り通路、４８Ａ，４８Ｂ，５１Ａ，５１Ｂ
…小ノツチ部、４９Ａ，４９Ｂ…大ノツチ部。 1 to 5 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view showing a pressure control valve, and FIG.
The figure is a sectional view in the direction of the arrow in Fig. 1, Fig. 3 is an external view of the main part of the spool shown in Fig. 1, Fig. 4 is a sectional view in the direction of the arrow in Fig. 3, and Fig. 5 is the first
The characteristic diagrams of the pressure control valve shown in the figures, FIGS. 6 to 8 show the second embodiment of the present invention, FIG. 6 is an external view of the main parts similar to FIG. 4, and FIG. 6 is a cross-sectional view in the direction indicated by the arrow in FIG. 6, FIG. 8 is a characteristic diagram similar to that in FIG. 10th
The figure is a longitudinal cross-sectional view of the pressure control valve shown in Figure 9.
Figure 1 is a sectional view in the direction of the arrow in Figure 10;
FIG. 12 is a characteristic diagram of the pressure control valve shown in FIG. 10. 11...Pressure control valve, 12...Valve body, 13A, 1
3B...Hydraulic power source side port, 14A, 14B...Actuator side port, 15...Spool sliding hole, 16
A, 16B, 17A, 17B...Oil groove, 19A, 1
9B...Oil chamber, 24A, 24B...Stopper, 25A
, 25B...Spring, 40...Spool, 41, 42A
, 42B, 43A, 43B...Land, 44A, 4
4B... Chamfered portion, 45A, 45B, 46A, 46
B... Throttle passage, 48A, 48B, 51A, 51B
...Small notch part, 49A, 49B...Large notch part.

Claims

[Scope of utility model registration request]

a valve body having a hydraulic power source side port and an actuator side port; a spool that is slidably provided within the valve body and has a land that opens and closes between the respective ports; an oil chamber formed in the valve body, large and small throttle passages bored in the spool with different effective cross-sectional areas to communicate each oil chamber with the oil pressure source side port, and the oil chamber. In a pressure control valve that is provided indoors and includes a spring that biases the spool to a neutral position, the land of the spool defines a metering area that opens and closes between the ports,
A small notch portion located near the port on the hydraulic power source side and having a small effective cross-sectional area that is almost constant, and a large notch portion that communicates with the small notch portion and whose effective cross-sectional area gradually increases are provided, and the spool is When the valve is in the open state or when the ports are opened through the large notch, one of the oil chambers is opened only through the smaller throttle passage, and the other is connected to the other side of the spool. Each of the oil chambers communicates with the oil pressure source side ports through the end face, and when the spool is in a closed state or when the ports are opened through the small notch, the oil chambers are large and small. A pressure control valve characterized in that the pressure control valve is configured to communicate with each of the hydraulic pressure source side ports via the throttle passage.