JPH0411980U

JPH0411980U -

Info

Publication number: JPH0411980U
Application number: JP5277290U
Authority: JP
Priority date: 1990-05-21
Filing date: 1990-05-21
Publication date: 1992-01-30
Anticipated expiration: 2005-05-21
Also published as: JP2531884Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係るスプールバル
ブの概略縦断面図、第２図ａ，ｂは第１図のスプ
ールバルブの制御状態を示す要部縦断面図、第３
図は従来のスプールバルブの縦断面図、第４図は
正常な制御特性と流体大または流体粘度が大きい
ときの制御特性を示すグラフである。符号の説明、１……スプールバルブ、２……ス
リーブ、２１……端壁、２２……段凹部、３……
スプール、３１，３２……第１、第２ランド部、
３３……小径部、４……ソレノイド、５……コイ
ル、６……ケース、７……センタポスト、８……
軸受、９……プランジヤ、１０……ロツド、１１
，１２，１３……第１、第２、第３スプリング、
１５……可動スリーブ、１６……しぼり板、Ｐ_０……流入ポート、Ｐ_１……流出ポート、Ｐ_２……
可動ポート、Ｓ_１……第１室、Ｓ_２……第２室。 FIG. 1 is a schematic longitudinal sectional view of a spool valve according to an embodiment of the present invention, FIGS.
The figure is a longitudinal sectional view of a conventional spool valve, and FIG. 4 is a graph showing normal control characteristics and control characteristics when the fluid size or fluid viscosity is large. Explanation of symbols, 1...Spool valve, 2...Sleeve, 21...End wall, 22...Step recess, 3...
Spool, 31, 32...first and second land parts,
33... Small diameter part, 4... Solenoid, 5... Coil, 6... Case, 7... Center post, 8...
Bearing, 9... Plunger, 10... Rod, 11
, 12, 13...first, second, third springs,
15... Movable sleeve, 16... Squeezing plate, P ₀ ...Inflow port, P ₁ ...Outflow port, P ₂ ...
Movable port, S ₁ ... first chamber, S ₂ ... second chamber.

Claims

[Claims for Utility Model Registration] A spool is reciprocatably inserted into the inner periphery of a sleeve having an inflow port and an outflow port spaced apart from each other by a predetermined distance in the axial direction; A first land portion and a second land portion are provided in sliding contact with the periphery, and an annular flow path is formed between the first land portion and the second land portion to communicate between the inflow port and the outflow port, and the outflow port is connected to the outflow port. In a spool valve that controls fluid pressure by changing the opening area of the inflow port by moving the spool with the port always open and changing the opening area of the inflow port by one first land part, an axial direction is provided at the inflow port area inside the sleeve. a movable sleeve that is freely movable; the movable sleeve has a movable port that communicates with the inflow port;
Furthermore, a squeeze plate is provided on the inner periphery of the movable sleeve to narrow down the cross section of the annular flow path, dividing the annular flow path into a first chamber on the inflow port side and a second chamber on the outflow port side. A spool valve characterized in that a movable sleeve is configured to be movable by a pressure difference between a first chamber and a second chamber.