JPS62274106A - Sealing device for hydraulic actuator - Google Patents
Sealing device for hydraulic actuatorInfo
- Publication number
- JPS62274106A JPS62274106A JP11819786A JP11819786A JPS62274106A JP S62274106 A JPS62274106 A JP S62274106A JP 11819786 A JP11819786 A JP 11819786A JP 11819786 A JP11819786 A JP 11819786A JP S62274106 A JPS62274106 A JP S62274106A
- Authority
- JP
- Japan
- Prior art keywords
- seals
- orifice
- check valve
- hydraulic actuator
- sealing device
- 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 14
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Landscapes
- Actuator (AREA)
- Sealing Devices (AREA)
Abstract
Description
【発明の詳細な説明】 3.1 発明の詳細な説明 〔産業上の利用分野〕 本発明は油圧アクチュエーターのシール装置に関する。[Detailed description of the invention] 3.1 Detailed description of the invention [Industrial application field] The present invention relates to a sealing device for a hydraulic actuator.
従来、油圧アクチーエータ−におけるピストンが貫通す
るシリンダー壁部のシール装置に、例えば第2図縦断面
図に示すように、ピストン1が貫通するシリンダー壁2
の部分に2個のシール3.3を配置した上、両シール間
部4を戻シ圧5に帰すベント回路6を接続し、同ベント
回路6にオリフィス7を配設したものがあるが、このよ
うな2重シール間をオリフィスを介し戻シ圧に帰すベン
ト回路に接続した装置では、シール間が高圧とならずシ
ール性能はよいが、外側のシールが損傷し次場合戻シ圧
回路から外部漏れを生ずる不都合がある。Conventionally, a sealing device for a cylinder wall through which a piston passes through in a hydraulic actuator includes a cylinder wall 2 through which a piston 1 passes, for example, as shown in the vertical cross-sectional view of FIG.
There is one in which two seals 3.3 are placed in the area, a vent circuit 6 is connected to return the pressure 5 between the seals 4, and an orifice 7 is provided in the vent circuit 6. In a device such as this, in which the double seal is connected to a vent circuit that returns the return pressure via an orifice, the seal performance is good because high pressure does not occur between the seals, but if the outer seal is damaged and the This has the disadvantage of causing external leakage.
本発明は、このような事情に鑑みて提案されたもので、
シール性能がよく、かつ2重シールの外側シールが損傷
しても、戻シ圧回路からの外部漏れが生ぜず、信頼性が
高い油圧アクチェエータ−のシール装置を提供すること
を目的とする。The present invention was proposed in view of these circumstances, and
To provide a sealing device for a hydraulic actuator which has good sealing performance, does not cause external leakage from a return pressure circuit even if an outer seal of a double seal is damaged, and is highly reliable.
そのために本発明は、油圧アクチュエーターピストンが
貫通するシリンダー壁部に2個のシールを並設するとX
もに上記両シール間部に戻シ圧へ帰すベント回路を接続
し、かつ同ベント回路にオリフィス及びチェックバルブ
を配設したことを特徴とする。To this end, the present invention provides two seals in parallel on the cylinder wall through which the hydraulic actuator piston passes.
The present invention is characterized in that a vent circuit for returning to the return pressure is connected to the space between the two seals, and an orifice and a check valve are disposed in the vent circuit.
上述の構成によシ、シール性能がよく、かつ2重シール
の外側シールが損傷しても、戻り圧回路からの外部漏れ
が生ぜず、信頼性が高い油圧アクチュエーターのシール
装置を得ることができる。With the above configuration, it is possible to obtain a sealing device for a hydraulic actuator that has good sealing performance, does not leak externally from the return pressure circuit even if the outer seal of the double seal is damaged, and is highly reliable. .
本発明の一実施例を図面について説明すると、第1図は
その縦断面図である。An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof.
上図において、第2図と同一の記号はそれぞれ同図と同
一の部材を示し、アクチュエーターピストン1が貫通す
るシリンダー壁2に2個のシール3,3を並設して2重
シール構造をとシ、両シール間部4に戻り圧5へ帰すベ
ント回路6を接続し、同ベント回路6にオリフィス7と
チェックバルブ8を配設している。In the above figure, the same symbols as in Fig. 2 indicate the same members as in the same figure, and two seals 3, 3 are arranged side by side on the cylinder wall 2 through which the actuator piston 1 passes, creating a double seal structure. A vent circuit 6 for returning pressure 5 is connected to the space 4 between both seals, and an orifice 7 and a check valve 8 are disposed in the vent circuit 6.
このような装置においては、2個のシール3.3の中間
部4が、ベント回路6のオリフィス7及びチェックバル
ブ8を介して戻り圧5に接続されているため、長時間使
用中も、中間部4の油はオリフィス7及びチェックバル
ブ8を経て排出されるから高圧とならないのでシール性
能はよく、また仮令外側のシール3、が損傷しても、チ
ェックバルブ8によシ戻り圧5の作動油がシール側へ流
れることは阻止され、よって戻シ圧回路油が外部に漏れ
ることはない。In such a device, the intermediate portion 4 of the two seals 3.3 is connected to the return pressure 5 via the orifice 7 of the vent circuit 6 and the check valve 8, so that even during long-term use, the intermediate portion 4 of the two seals 3. Since the oil in section 4 is discharged through orifice 7 and check valve 8, it does not become under high pressure, so the sealing performance is good, and even if the outer seal 3 is damaged, the return pressure 5 can be activated by check valve 8. Oil is prevented from flowing to the seal side, so the return pressure circuit oil does not leak to the outside.
要するに本発明によれば、油圧アクチュエーターピスト
ンが貫通するシリンダー壁部に2個のシールを並設する
と\もに上記両シール間部に戻シ圧へ帰すベント回路を
接続し、かつ同ベント回路にオリフィス及びチェックバ
ルブを配設したことにより、シール性能がよく、かつ2
重シールの外側シールが損傷しても、戻シ圧回路からの
外部漏れが生ぜず、信頼性が高い油圧アクチュエーター
のシール装置を得るから、本発明は産業上極めて有益な
ものである。In short, according to the present invention, when two seals are arranged side by side on the cylinder wall through which the hydraulic actuator piston passes, a vent circuit for returning pressure to the cylinder is connected to the space between the two seals, and the vent circuit is connected to the vent circuit. The provision of an orifice and check valve provides good sealing performance and
The present invention is extremely useful industrially because even if the outer seal of the heavy seal is damaged, no external leakage occurs from the return pressure circuit and a highly reliable sealing device for a hydraulic actuator is obtained.
第1図は本発明油圧アクチュエーターのシール装置の一
実施例を示す縦断面図、第2図は従来のシール装置を示
す縦断面図である。
1・・油圧アクチュエーターピストン、2・・シリンダ
ー壁、3・・シール、4・・シール間部、5・・戻シ圧
、6・・ベント回路、7・・オリフィス、8・・チェッ
クバルブ。
復代理人 弁理士 塚 本 正 文
箱1図
第2図FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a sealing device for a hydraulic actuator of the present invention, and FIG. 2 is a longitudinal cross-sectional view showing a conventional sealing device. 1. Hydraulic actuator piston, 2. Cylinder wall, 3. Seal, 4. Area between seals, 5. Return pressure, 6. Vent circuit, 7. Orifice, 8. Check valve. Sub-Agent Patent Attorney Masashi Tsukamoto Document Box 1 Figure 2
Claims (1)
両シール間部に戻り圧へ帰すベント回路を接続し、かつ
同ベント回路にオリフイス及びチェックバルブを配設し
たことを特徴とする油圧アクチュエーターのシール装置
。[Claims] Two seals are arranged side by side on the cylinder wall through which the hydraulic actuator piston passes, and a vent circuit for returning pressure is connected between the two seals, and an orifice and an orifice are connected to the vent circuit. A sealing device for a hydraulic actuator characterized by being equipped with a check valve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11819786A JPS62274106A (en) | 1986-05-22 | 1986-05-22 | Sealing device for hydraulic actuator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11819786A JPS62274106A (en) | 1986-05-22 | 1986-05-22 | Sealing device for hydraulic actuator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62274106A true JPS62274106A (en) | 1987-11-28 |
Family
ID=14730575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11819786A Pending JPS62274106A (en) | 1986-05-22 | 1986-05-22 | Sealing device for hydraulic actuator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62274106A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH056203U (en) * | 1991-07-08 | 1993-01-29 | 杉安工業株式会社 | Oil leakage prevention mechanism of hydraulic cylinder device |
CN102705298A (en) * | 2012-07-09 | 2012-10-03 | 杨志勤 | Hydraulic reciprocating seal leakage recovery device |
DE102011119181A1 (en) * | 2011-11-23 | 2013-05-23 | Robert Bosch Gmbh | Cylinders, in particular hydraulic cylinders for the deep sea |
-
1986
- 1986-05-22 JP JP11819786A patent/JPS62274106A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH056203U (en) * | 1991-07-08 | 1993-01-29 | 杉安工業株式会社 | Oil leakage prevention mechanism of hydraulic cylinder device |
DE102011119181A1 (en) * | 2011-11-23 | 2013-05-23 | Robert Bosch Gmbh | Cylinders, in particular hydraulic cylinders for the deep sea |
CN102705298A (en) * | 2012-07-09 | 2012-10-03 | 杨志勤 | Hydraulic reciprocating seal leakage recovery device |
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