JPS62200874U

JPS62200874U -

Info

Publication number: JPS62200874U
Application number: JP8857886U
Authority: JP
Priority date: 1986-06-12
Filing date: 1986-06-12
Publication date: 1987-12-21
Also published as: JPH03613Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る電磁弁におけるプランジ
ヤ変位に対する吸引力及びリターンスプリングの
バネ定数の関係を示すグラフ、第２図イは本考案
の第１実施例における駆動電流と出力圧との関係
を示すグラフ、第２図ロは本考案の第２実施例に
おける駆動電流と出力圧との関係を示すグラフ、
第３図イは本考案及び従来例に共通する第１実施
例たる電磁弁の概略断面図、第３図ロは第２実施
例たる、第３図イと同様な概略断面図、第４図は
従来の電磁弁におけるプランジヤ変位に対する吸
引力及びリターンスプリングのバネ定数の関係を
示すグラフ、第５図は従来の電磁弁における駆動
電流と出力圧との関係を示すグラフである。１……ソレノイド、２……コア、３……プラン
ジヤ、４……リターンスプリング、５……スプー
ル型三方弁、６……スプール、６ａ……スプール
溝、６ｂ……フイードバツク用スプール溝、７…
…入力ポート、８……ドレーンポート、９……出
力ポート、９ａ……フイードバツク回路。 Fig. 1 is a graph showing the relationship between the attraction force and the spring constant of the return spring with respect to plunger displacement in the solenoid valve according to the present invention, and Fig. 2A shows the relationship between the drive current and output pressure in the first embodiment of the present invention. The graph shown in FIG. 2B is a graph showing the relationship between drive current and output pressure in the second embodiment of the present invention.
Fig. 3A is a schematic sectional view of a solenoid valve according to the first embodiment common to the present invention and the conventional example, Fig. 3B is a schematic sectional view similar to Fig. 3A, which is the second embodiment, and Fig. 5 is a graph showing the relationship between the attractive force and the spring constant of the return spring with respect to plunger displacement in a conventional solenoid valve, and FIG. 5 is a graph showing the relationship between drive current and output pressure in the conventional solenoid valve. 1...Solenoid, 2...Core, 3...Plunger, 4...Return spring, 5...Spool type three-way valve, 6...Spool, 6a...Spool groove, 6b...Spool groove for feedback, 7...
...Input port, 8...Drain port, 9...Output port, 9a...Feedback circuit.

Claims

[Scope of utility model registration request]

In a solenoid valve in which the spool of a spool-type three-way valve equipped with a fluid pressure feedback circuit is driven by a solenoid with direct current via a plunger, the spring constant of the return spring, which is arranged so as to face the direction in which the solenoid's suction force is applied, is defined as the spring constant of the solenoid. 1. A pressure control solenoid valve characterized in that the rate of increase in attraction force with respect to displacement in the direction in which attraction force is applied is within a range from a maximum value to a minimum value in a working displacement section and a working current range.