JPH0198975U

JPH0198975U -

Info

Publication number: JPH0198975U
Application number: JP19648287U
Authority: JP
Priority date: 1987-12-24
Filing date: 1987-12-24
Publication date: 1989-07-03
Also published as: JPH0451264Y2

Description

[Brief explanation of the drawing]

第１図は本考案の実施例を示す油圧回路図、第
２図はクロスオーバリリーフ弁を拡大して示す縦
断面図、第３図は一次側圧力と時間との関係を示
す特性線図である。１…油圧モータ、２…油圧ポンプ、３…タンク
、４Ａ，４Ｂ…主管路、５…方向切換弁、６…ブ
レーキ弁、９，１０…クロスオーバリリーフ弁（
圧力制御弁）、１１…弁本体、１１Ａ…主弁体摺
動穴、１１Ｂ…油穴、１２…ばね室、１３…弁座
部材（主弁座）、１５…ガイド部材、１５Ａ…小
径筒部、１６…主弁体、１７…圧力設定用ばね、
１８…副弁体、１９…弱ばね、２０…第１の圧力
室、２１…ピストン、２２…第２の圧力室、２３
…補助ばね、２４…第１の絞り油路、２５…第２
の絞り油路、２６…油路、２８…ドレン油路。 Fig. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, Fig. 2 is a vertical cross-sectional view showing an enlarged cross-over relief valve, and Fig. 3 is a characteristic diagram showing the relationship between primary side pressure and time. be. DESCRIPTION OF SYMBOLS 1... Hydraulic motor, 2... Hydraulic pump, 3... Tank, 4A, 4B... Main pipe line, 5... Directional switching valve, 6... Brake valve, 9, 10... Crossover relief valve (
Pressure control valve), 11...Valve body, 11A...Main valve body sliding hole, 11B...Oil hole, 12...Spring chamber, 13...Valve seat member (main valve seat), 15...Guide member, 15A...Small diameter cylindrical part , 16... Main valve body, 17... Pressure setting spring,
18...Sub-valve body, 19...Weak spring, 20...First pressure chamber, 21...Piston, 22...Second pressure chamber, 23
...Auxiliary spring, 24...First throttle oil path, 25...Second
throttle oil passage, 26...oil passage, 28...drain oil passage.

Claims

[Scope of Claim for Utility Model Registration] (1) A valve body consisting of a cylindrical body with a main valve seat on one side and a spring chamber on the other side across the main valve body sliding hole formed in the axially intermediate portion. , a main valve body slidably inserted into a main valve body sliding hole of the valve body; and a main valve body disposed within a spring chamber of the valve body so as to seat the main valve body on the main valve seat. In the pressure control valve, the pressure control valve includes a pressure setting spring that is biased, and a cylindrical guide member provided on the spring chamber side of the valve body, and a cylindrical guide member provided on the spring chamber side of the valve body so as to be seated on and off the main valve body. one side defines a first pressure chamber within the main valve body, and the other side is slidably inserted into the guide member and defines the first pressure chamber within the main valve body.
a secondary valve element defining a second pressure chamber having a larger pressure receiving area than the pressure chamber; and a main valve element configured to guide the primary side pressure acting on the main valve element to the first pressure chamber. a first throttle oil passage bored in the auxiliary valve body so as to guide the pressure in the first pressure chamber to a second pressure chamber; The valve body is characterized by being composed of a second throttle oil passage having a small flow path area and a drain oil passage bored in the valve body so as to communicate the spring chamber of the valve body with the secondary side. Pressure control valve. (2) The pressure control valve according to claim (1), wherein a piston for expanding the inside of the second pressure chamber is slidably provided in the guide member.