JPS62176568U

JPS62176568U -

Info

Publication number: JPS62176568U
Application number: JP6317286U
Authority: JP
Priority date: 1986-04-28
Filing date: 1986-04-28
Publication date: 1987-11-10
Also published as: JPH0313009Y2

Description

[Brief explanation of the drawing]

第１図はこの考案の第１実施例を示した電磁比
例圧力制御弁の縦断面図、第２図及び第３図はそ
れぞれこの考案の第２実施例及び第３実施例の要
部のみを示す縦断面図、第４図乃至第６図はダン
ピングピストン回りの部品精度と摺動抵抗の関係
を説明するための説明図、第７図はこの考案の第
４実施例の要部のみを示す縦断面図、第８図は従
来の電磁比例圧力制御弁の一例を示す縦断面図で
ある。２０……弁本体、２３……ポペツト弁、２７，
２８，４６……スプリング、３０……比例ソレノ
イド、３５……可動鉄心、３６……プツシユロツ
ド、４１……カバー、４３，５３，６３，７３…
…ダンピングピストン、４３ａ，５３ａ，６３ａ
……オリフイス、４３ｂ，５３ｂ，６３ｂ……油
路、４８，４９……油室、５３ｃ，６３ｃ，７３
ｃ……チエツク弁、５３ｄ，６３ｄ……第２の油
路、６３ｅ，７３ｅ……環状の凸部。 Fig. 1 is a vertical sectional view of an electromagnetic proportional pressure control valve showing the first embodiment of this invention, and Figs. 2 and 3 show only the main parts of the second and third embodiments of this invention, respectively. 4 to 6 are explanatory diagrams for explaining the relationship between precision of parts around the damping piston and sliding resistance, and FIG. 7 shows only the essential parts of the fourth embodiment of this invention. FIG. 8 is a vertical cross-sectional view showing an example of a conventional electromagnetic proportional pressure control valve. 20...Valve body, 23...Poppet valve, 27,
28, 46... Spring, 30... Proportional solenoid, 35... Movable core, 36... Push rod, 41... Cover, 43, 53, 63, 73...
...damping piston, 43a, 53a, 63a
... Orifice, 43b, 53b, 63b ... Oil passage, 48, 49 ... Oil chamber, 53c, 63c, 73
c...Check valve, 53d, 63d...Second oil passage, 63e, 73e...Annular convex portion.

Claims

[Scope of Claim for Utility Model Registration] 1. In an electromagnetic proportional pressure control valve that controls hydraulic pressure by pressing a poppet valve via a spring using an electromagnetic force generated by a proportional solenoid, the proportional solenoid is provided on the opposite side of the poppet valve. A damping piston is slidably provided in the cover, the damping piston partitions the inside of the cover into two oil chambers, and an oil passage is connected to the damping piston to regulate the flow rate and communicate between the two oil chambers. An electromagnetic proportional pressure control valve characterized in that the damping piston is always brought into close contact with the rear end of a push rod protruding into the cover of the proportional solenoid by means of a spring. 2. The electromagnetic proportional pressure control valve according to claim 1, wherein the damping piston is provided with a damping orifice in the oil passage. 3 Utility model registration claim 1 or 2, in which the damping piston is provided with a second oil passage equipped with a check valve that opens only when the proportional solenoid operates in the direction of increasing the hydraulic pressure. The electromagnetic proportional pressure control valve described. 4. The electromagnetic proportional pressure control valve according to any one of claims 1 to 3, wherein the damping piston has an annular convex portion on its outer periphery that slides into contact with the cover.