JPH02110782U

JPH02110782U -

Info

Publication number: JPH02110782U
Application number: JP1845789U
Authority: JP
Priority date: 1989-02-21
Filing date: 1989-02-21
Publication date: 1990-09-05

Description

[Brief explanation of the drawing]

第１図は、本考案に従う電磁パイロツト制御弁
の一具体例を示す断面図。第２図は、第１図の電
磁パイロツト制御弁の第１のパイロツト圧力室の
近傍を拡大して示す断面図。第３―Ａ図及び第３
―Ｂ図は、夫々、第１図の電磁パイロツト制御弁
を用いた場合におけるスプール及び出力ロツドの
変位と時間との関係、並びに従来の電磁パイロツ
ト制御弁を用いた場合におけるスプール及び出力
ロツドの変位と時間との関係を示す図。２…弁本体、８…スプール、１８…第１のパイ
ロツト圧力室、２６…第２のパイロツト圧力室、
３８…流体圧シリンダ機構、５０…メインポンプ
、５４…第１のパイロツト流路、５６…第２のパ
イロツト流路、５８…補助ポンプ、６４及び６６
…電磁比例弁、６８及び７０…電磁開閉弁、８８
…スプール、１２２…ボール弁、１３２…入力手
段、１３４…加算器、１３６，１３７，１３８及
び１３９…制御手段、１４０…検出手段。 FIG. 1 is a sectional view showing a specific example of an electromagnetic pilot control valve according to the present invention. 2 is an enlarged sectional view showing the vicinity of the first pilot pressure chamber of the electromagnetic pilot control valve of FIG. 1; FIG. Figure 3-A and 3
- Diagram B shows the relationship between the displacement of the spool and output rod and time when using the electromagnetic pilot control valve shown in Fig. 1, and the displacement of the spool and output rod when using the conventional electromagnetic pilot control valve, respectively. A diagram showing the relationship between and time. 2... Valve body, 8... Spool, 18... First pilot pressure chamber, 26... Second pilot pressure chamber,
38...Fluid pressure cylinder mechanism, 50...Main pump, 54...First pilot flow path, 56...Second pilot flow path, 58...Auxiliary pump, 64 and 66
... Solenoid proportional valve, 68 and 70 ... Solenoid on-off valve, 88
... Spool, 122 ... Ball valve, 132 ... Input means, 134 ... Adder, 136, 137, 138 and 139 ... Control means, 140 ... Detection means.

Claims

[Claims for Utility Model Registration] 1. A valve body, a pilot pressure chamber defined in the valve body, and a spool movably attached to the valve body and moved by the fluid pressure of the pilot pressure chamber. , an electromagnetic pilot comprising a pilot pressure source for supplying pilot pressure fluid and a pilot flow path for guiding pressure fluid from the pilot pressure source to the pilot pressure chamber, the flow path being switched by the movement of the spool. In the control valve, an electromagnetic proportional valve and an electromagnetic on-off valve are arranged in parallel in the pilot flow path, and the feed amount of the pilot pressure fluid is controlled by the action of the electromagnetic proportional valve and the electromagnetic on-off valve. An electromagnetic pilot control valve featuring: 2 A first pilot pressure chamber is defined at one end of the spool, and a second pilot pressure chamber is defined at the other end of the spool, and the pilot pressure fluid from the pilot pressure source is transferred to the first pilot pressure chamber. A first pilot flow path leading to the pressure chamber and a second pilot flow path leading pilot pressure fluid from the pilot pressure source to the second pilot pressure chamber are provided, and the first pilot flow path and the second pilot flow path lead to the second pilot pressure chamber. 2. The electromagnetic pilot control valve according to claim 1, wherein the electromagnetic proportional valve and the electromagnetic on-off valve are arranged in parallel in each of the two pilot flow paths.