JPH0454377U

JPH0454377U -

Info

Publication number: JPH0454377U
Application number: JP9669190U
Authority: JP
Priority date: 1990-09-14
Filing date: 1990-09-14
Publication date: 1992-05-11
Anticipated expiration: 2005-09-14
Also published as: JP2543000Y2

Description

[Brief explanation of the drawing]

第１図は本考案の実施例断面図；第２図は第１
図の主要部を取出して示した説明図；第３図は第
３のバイパス通路を設けていない時の第１の切換
位置での流体の流れを示した説明図；第４図は第
３図の右側のタンク室の流れを拡大した説明図；
第５図は第３のバイパス通路を設けていない時の
第２の切換位置での流体の流れを示した説明図；
第６図は第５図の右側のタンク室の流れを拡大し
た説明図；第７図は本願考案者等が既に提案して
いる電磁切換弁の断面図である。図中、１……弁本体、２，２′……ソレノイド
、３，３′……コイル、４，４′……アマチユア
、５……スプール、６，６′……スプリングシー
ト、７，７′……スプリング、８，８′……スプ
リング室、９……第１のバイパス通路、１０，１
０′……タンク室、１１，１１′……プツシユピ
ン、１２……第２のバイパス通路、１４，１４′
……ランド、１５……シリンダ、１６……タンク
、１８……ポンプ、２０，２０′……テーパ面、
２４……第３のバイパス通路。 Figure 1 is a sectional view of an embodiment of the present invention; Figure 2 is a cross-sectional view of an embodiment of the present invention;
An explanatory diagram showing the main parts of the figure; Figure 3 is an explanatory diagram showing the fluid flow at the first switching position when the third bypass passage is not provided; Figure 4 is an explanatory diagram showing the fluid flow at the first switching position when the third bypass passage is not provided; An enlarged explanatory diagram of the flow in the tank room on the right side of
FIG. 5 is an explanatory diagram showing the fluid flow at the second switching position when the third bypass passage is not provided;
FIG. 6 is an enlarged explanatory diagram of the flow in the tank chamber on the right side of FIG. 5; FIG. 7 is a sectional view of an electromagnetic switching valve already proposed by the inventors of the present invention. In the figure, 1... Valve body, 2, 2'... Solenoid, 3, 3'... Coil, 4, 4'... Armature, 5... Spool, 6, 6'... Spring seat, 7, 7 '... Spring, 8, 8'... Spring chamber, 9... First bypass passage, 10, 1
0'... Tank chamber, 11, 11'... Push pin, 12... Second bypass passage, 14, 14'
... Land, 15 ... Cylinder, 16 ... Tank, 18 ... Pump, 20, 20' ... Tapered surface,
24...Third bypass passage.

Claims

[Claims for Utility Model Registration] A valve body having a spool hole that communicates with a pump port, a tank port, and at least first and second load ports; a valve body that is slidably incorporated into the spool hole of the valve body;
a spool that connects or disconnects the first and second load ports with the pump port and the tank port; a pair of springs that are incorporated in spring chambers formed at both ends of the spool hole and that hold the spool in a neutral position; and; disposed on both sides of the valve body, and by energizing either side, the spool is moved from the neutral position to the first position.
a pair of solenoids driven to a switching position or a second switching position; a first bypass passage communicating between spring chambers at both ends of the spool hole; a second tank chamber partitioned by a land of the spool; a second bypass passage that communicates a first tank chamber formed on the opposite side with the tank port through the electromagnetic switching valve, wherein the land end surface of the spool on the tank chamber side is a tapered surface. The electromagnetic switching valve further comprises a third bypass passage that directly communicates the first tank chamber with a tank port, and is provided at a position symmetrical to the second bypass passage.