JPH0262176U - - Google Patents
Info
- Publication number
- JPH0262176U JPH0262176U JP14150088U JP14150088U JPH0262176U JP H0262176 U JPH0262176 U JP H0262176U JP 14150088 U JP14150088 U JP 14150088U JP 14150088 U JP14150088 U JP 14150088U JP H0262176 U JPH0262176 U JP H0262176U
- Authority
- JP
- Japan
- Prior art keywords
- plunger
- sleeve
- casing
- hole
- stepped piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 3
Landscapes
- Safety Valves (AREA)
Description
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図および第3図は各々同リリーフ
弁のダンピング動作の説明図、第4図は同リリー
フ弁の寸法関係の説明図、第5図はダンピング室
がない場合に段付ピストンがストロークエンドに
達した瞬間に段付ピストンに作用する液圧の変動
状態の説明図、第6図は同リリーフ圧力の変動状
態の説明図、第7図はダンピング室を有する場合
にリリーフ弁始動時における段付ピストンに作用
する液圧力と時間との関係の説明図、第8図は同
リリーフ圧力と時間との関係の説明図、第9図は
本考案の別の実施例におけるリリーフ弁の断面図
である。
1……ケーシング、2……流入孔、3……シー
ト、9……プランジヤ、10……貫通孔、11…
…絞り部、12……段付ピストン、15……連通
孔、16……ポペツト、17……突出部、20…
…第1のばね、22……第3のばね、41……ケ
ーシング、42……流入孔、43……シート、4
9……プランジヤ、50……貫通孔、51……絞
り部、52……段付ピストン、53……スリーブ
、54……液室、60……第1のばね、61……
第2のばね、62……第3のばね。
FIG. 1 is a sectional view of a relief valve according to an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams of the damping operation of the relief valve, and FIG. 4 is an explanatory diagram of the dimensional relationship of the relief valve. Fig. 5 is an explanatory diagram of the fluctuation state of the hydraulic pressure acting on the stepped piston at the moment when the stepped piston reaches the stroke end when there is no damping chamber, and Fig. 6 is an explanatory diagram of the fluctuation state of the relief pressure. Fig. 7 is an explanatory diagram of the relationship between the hydraulic pressure acting on the stepped piston and time when the relief valve is started when the damping chamber is provided, Fig. 8 is an explanatory diagram of the relationship between the relief pressure and time, and Fig. 9 The figure is a sectional view of a relief valve in another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Casing, 2...Inflow hole, 3...Seat, 9...Plunger, 10...Through hole, 11...
...Constricted portion, 12...Stepped piston, 15...Communication hole, 16...Poppet, 17...Protrusion, 20...
...First spring, 22...Third spring, 41...Casing, 42...Inflow hole, 43...Seat, 4
9... Plunger, 50... Through hole, 51... Restricted portion, 52... Stepped piston, 53... Sleeve, 54... Liquid chamber, 60... First spring, 61...
Second spring, 62...Third spring.
Claims (1)
が一端に固着されかつ他端が閉塞された筒状のケ
ーシングと、一端部が大径に形成されて前記ケー
シングの一端部内周に摺動自在に嵌合しかつ他端
部が筒状のスリーブの内周に摺動自在に嵌合する
プランジヤと、前記ケーシングの他端部内周と前
記スリーブの外周との間に摺動自在に嵌合してケ
ーシングの他端との間に液室を形成する筒状の段
付ピストンと、前記スリーブの内周に摺動自在に
嵌合しかつ下端に先細り状の突出部が突設された
ポペツトとを設け、前記プランジヤに軸芯方向に
沿う貫通孔を形成すると共にこの貫通孔の任意の
箇所を微細孔にして絞り部を形成し、前記ケーシ
ングの他端と前記ポペツトとの間に第1のばねを
介装してポペツトの突出部を前記プランジヤの貫
通孔に液密に嵌入させ、前記スリーブの一端と前
記プランジヤの一端部との間に第2のばねを介装
してプランジヤの一端を前記シートに液密に当接
させ、前記段付ピストンの一端と前記プランジヤ
の一端部との間に第3のばねを介装して段付ピス
トンの他端を前記ケーシングの他端に当接させて
、前記プランジヤの貫通孔と前記液室とが前記ス
リーブに形成された連通孔を介して連通しかつそ
の連通路が前記ポペツトの突出部により開閉され
る構成としたことを特徴とするリリーフ弁。 2 流入側圧液の流入孔を形成する環状のシート
が一端に固着されかつ他端が閉塞された筒状のケ
ーシングと、一端部が大径に形成されて前記ケー
シングの一端部内周に摺動自在に嵌合しかつ他端
部が管状のロツドの一端部外周に摺動自在に嵌合
するプランジヤと、前記ロツドの他端部外周に摺
動自在に嵌合する筒状のスリーブと、前記ケーシ
ングの他端部内周と前記スリーブの外周との間に
摺動自在に嵌合してケーシングの他端との間に液
室を形成する筒状の段付ピストンとを設け、前記
プランジヤに軸芯方向に沿う貫通孔を形成すると
共にこの貫通孔の任意の箇所を微細孔にして絞り
部を形成し、前記ロツドの一端と前記プランジヤ
の一端部との間に第1のばねを介装してプランジ
ヤの一端を前記シートに液密に当接させ、前記ス
リーブの一端と前記プランジヤとの間に第2のば
ねを介装してスリーブの他端を前記ケーシングの
他端に液密に当接させ、前記段付ピストンの一端
と前記プランジヤとの間に第3のばねを介装して
段付ピストンの他端を前記ケーシングの他端に当
接させて、前記プランジヤの貫通孔と前記液室と
が前記ロツドを介して連通しかつその連通路が前
記スリーブにより開閉される構成としたことを特
徴とするリリーフ弁。[Claims for Utility Model Registration] 1. A cylindrical casing having an annular sheet fixed to one end and closed at the other end, forming an inflow hole for pressure liquid on the inflow side, and the casing having a large diameter at one end. a plunger that is slidably fitted to the inner periphery of one end and whose other end is slidably fitted to the inner periphery of a cylindrical sleeve; and between the inner periphery of the other end of the casing and the outer periphery of the sleeve; a cylindrical stepped piston that is slidably fitted to the sleeve and forms a liquid chamber between the sleeve and the other end of the casing; and a stepped piston that is slidably fitted to the inner periphery of the sleeve and has a tapered protrusion at the lower end. A poppet with a protruding portion is provided, a through hole is formed in the plunger along the axial direction, and an arbitrary part of the through hole is made into a fine hole to form a constricted portion, and the other end of the casing and the A first spring is interposed between the poppet and the poppet so that the protrusion of the poppet fits into the through hole of the plunger in a fluid-tight manner, and a second spring is interposed between one end of the sleeve and one end of the plunger. a third spring is interposed between one end of the stepped piston and one end of the plunger to bring one end of the stepped piston into fluid-tight contact with the seat; The plunger is brought into contact with the other end of the casing, and the through hole of the plunger and the liquid chamber communicate with each other via a communication hole formed in the sleeve, and the communication path is opened and closed by a protrusion of the poppet. A relief valve characterized by: 2. A cylindrical casing with an annular sheet forming an inflow hole for pressure liquid on the inflow side fixed at one end and closed at the other end, and one end formed with a large diameter so as to be slidable on the inner periphery of the one end of the casing. a plunger that is fitted into the rod and whose other end is slidably fitted to the outer periphery of one end of the rod; a cylindrical sleeve that is slidably fitted to the outer periphery of the other end of the rod; and the casing. A cylindrical stepped piston is provided between the inner periphery of the other end and the outer periphery of the sleeve so as to be slidably fitted to form a liquid chamber between the inner periphery of the sleeve and the other end of the casing. A through hole is formed along the direction, and an arbitrary part of the through hole is made a fine hole to form a constricted part, and a first spring is interposed between one end of the rod and one end of the plunger. One end of the plunger is brought into liquid-tight contact with the sheet, a second spring is interposed between one end of the sleeve and the plunger, and the other end of the sleeve is brought into contact with the other end of the casing in a fluid-tight manner. A third spring is interposed between one end of the stepped piston and the plunger, and the other end of the stepped piston is brought into contact with the other end of the casing, so that the liquid is connected to the through hole of the plunger. A relief valve characterized in that the chamber communicates with the chamber via the rod, and the communication path is opened and closed by the sleeve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988141500U JPH0717895Y2 (en) | 1988-10-28 | 1988-10-28 | Relief valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988141500U JPH0717895Y2 (en) | 1988-10-28 | 1988-10-28 | Relief valve |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0262176U true JPH0262176U (en) | 1990-05-09 |
JPH0717895Y2 JPH0717895Y2 (en) | 1995-04-26 |
Family
ID=31406614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1988141500U Expired - Lifetime JPH0717895Y2 (en) | 1988-10-28 | 1988-10-28 | Relief valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0717895Y2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5840664U (en) * | 1981-09-11 | 1983-03-17 | 三菱重工業株式会社 | relief valve |
JPS63246579A (en) * | 1987-04-01 | 1988-10-13 | Toshiba Mach Co Ltd | Relief valve of hydraulic motor |
-
1988
- 1988-10-28 JP JP1988141500U patent/JPH0717895Y2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5840664U (en) * | 1981-09-11 | 1983-03-17 | 三菱重工業株式会社 | relief valve |
JPS63246579A (en) * | 1987-04-01 | 1988-10-13 | Toshiba Mach Co Ltd | Relief valve of hydraulic motor |
Also Published As
Publication number | Publication date |
---|---|
JPH0717895Y2 (en) | 1995-04-26 |