JPH037585U

JPH037585U -

Info

Publication number: JPH037585U
Application number: JP6775989U
Authority: JP
Priority date: 1989-06-09
Filing date: 1989-06-09
Publication date: 1991-01-24

Description

[Brief explanation of drawings]

第１図は本考案の一実施例における電磁ソレノ
イドバルブのプランジヤ構造を部分的に示す要部
斜視図、第２図は実施例のプランジヤの作用を説
明するための説明図、第３図は従来例を示す断面
図、第４図は従来例の問題点を説明するためプラ
ンジヤと磁性体部分の構造を模式的に示した説明
図である。図中の符号、１；バルブボデイ、２；スプール
、３；入力ポート、４；出力ポート、５，１７；
リターンスプリング、６；パイロツト液圧切換機
構、７；電磁ソレノイド、８；パイロツト液室、
９；固定スプール、１０，１１；バルブシート、
１２；ジヨイントピン、１３；プランジヤ、１４
；電磁コイル、１５；磁極面、１６；磁性体、２
３；端部、２４；穴、２５；座ぐり、２６；溝。 Fig. 1 is a perspective view of a main part partially showing the plunger structure of an electromagnetic solenoid valve according to an embodiment of the present invention, Fig. 2 is an explanatory diagram for explaining the action of the plunger of the embodiment, and Fig. 3 is a conventional FIG. 4 is a sectional view showing an example, and is an explanatory view schematically showing the structure of the plunger and the magnetic body portion to explain the problems of the conventional example. Codes in the figure: 1; Valve body; 2; Spool; 3; Input port; 4; Output port; 5, 17;
Return spring, 6; Pilot fluid pressure switching mechanism, 7; Electromagnetic solenoid, 8; Pilot fluid chamber,
9; Fixed spool, 10, 11; Valve seat,
12; Joint pin, 13; Plunger, 14
; Electromagnetic coil, 15; Magnetic pole surface, 16; Magnetic material, 2
3; end, 24; hole, 25; counterbore, 26; groove.

Claims

[Scope of Claim for Utility Model Registration] A spool that is slidably provided in a valve body and switches input and output ports on and off, a pilot fluid chamber formed at one end of the spool, and a plunger in a first position. When the plunger is switched to the second position, the pilot fluid pressure is cut off from the pilot fluid chamber and communicated with the drain port, and when the plunger is switched to the second position, the pilot fluid chamber is cut off from the drain port and at the same time, the pilot fluid pressure is supplied. A pilot hydraulic pressure switching mechanism and a plunger of the pilot hydraulic pressure switching mechanism are opposed to the magnetic pole surface via a return spring, and when the electromagnetic coil is not energized, the return spring holds the plunger in the first position and the electromagnetic coil is An electromagnetic solenoid valve comprising an electromagnetic solenoid that strokes the plunger to the second position when energized, wherein a counterbore is formed in the abutting end surface of at least one of the plunger and the magnetic body.