JPH0177174U

JPH0177174U -

Info

Publication number: JPH0177174U
Application number: JP1987174089U
Authority: JP
Priority date: 1987-11-13
Filing date: 1987-11-13
Publication date: 1989-05-24
Anticipated expiration: 2002-11-13
Also published as: JPH0540372Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例におけるリリーフ弁
の断面図、第２図はダンピング室付近の要部拡大
断面図、第３図は別の実施例におけるリリーフ弁
のダンピング室付近の要部拡大断面図、第４図は
従来のリリーフ弁の断面図である。６……弁本体、８ａ……孔、８ｂ……細孔、９
ｂ……孔、１１……可動体、１３……可動ばね受
け部材、１４……主ばね、１６……連通路、１７
……ばね室、２０……液室、２１……ブツシユ、
２３……閉空間、２４……調整ばね、２５……可
変手段、３１……ダンピング室、３８……絞り通
路。 Fig. 1 is a sectional view of a relief valve in one embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part near the damping chamber, and Fig. 3 is an enlarged view of the main part of the relief valve near the damping chamber in another embodiment. 4 is a sectional view of a conventional relief valve. 6... Valve body, 8a... Hole, 8b... Pore, 9
b... Hole, 11... Movable body, 13... Movable spring receiving member, 14... Main spring, 16... Communication path, 17
... Spring chamber, 20 ... Liquid chamber, 21 ... Bushu,
23... Closed space, 24... Adjustment spring, 25... Variable means, 31... Damping chamber, 38... Throttle passage.

Claims

[Scope of Claim for Utility Model Registration] (1) A movable body that is disposed inside the valve body so as to be movable a predetermined distance in the axial direction and opens and closes a communication path between the supply side and the relief side of pressure fluid, and this movable body a movable spring receiving member disposed between the outer periphery of the valve body and the inner periphery of the valve body and movable a predetermined distance in the axial direction; and an intervening member between one end of the movable spring receiving member and one end of the movable body. a main spring mounted to bias the movable body toward one end side and the movable spring receiver member toward the other end side; A hole is formed in the movable body to be introduced into the liquid chamber on the other end surface side of the member, and the set pressure is adjusted by compressing the main spring via the movable spring receiving member by the liquid pressure in the liquid chamber. The relief valve is characterized in that an adjustment spring for biasing the movable body in the axial direction is provided in the liquid chamber, and a variable means for varying the biasing force of the adjustment spring is provided so as to be operable from outside the valve body. relief valve. (2) A step is formed on the sliding surface between the inner periphery of the valve body and the outer periphery of the movable spring receiving member to constitute an annular damping chamber, and this damping chamber is formed on the movable spring receiving member. The relief valve according to claim 1, which is a registered utility model, and is configured to communicate with a spring chamber that accommodates a main spring via a throttle passage. (3) A step is formed on the sliding surface between the inner periphery of the valve body and the outer periphery of the movable spring receiving member to constitute an annular damping chamber, and this damping chamber is formed on the movable spring receiving member. The relief valve according to claim 1, which is a registered utility model, and is configured to communicate with a liquid chamber via a throttle passage. (4) The movable body has a bushing attached to its other end, forming a closed space surrounded by the movable body and the bushing, and the hole of the movable body communicates with the closed space, The relief valve according to any one of claims 1 to 3, which is a registered utility model, and is configured to communicate with the liquid chamber through a pore formed in the movable body along the radial direction.