JPS5740104A - Device for preventing hydraulic cylinder from acting due to oil leak - Google Patents
Device for preventing hydraulic cylinder from acting due to oil leakInfo
- Publication number
- JPS5740104A JPS5740104A JP11536380A JP11536380A JPS5740104A JP S5740104 A JPS5740104 A JP S5740104A JP 11536380 A JP11536380 A JP 11536380A JP 11536380 A JP11536380 A JP 11536380A JP S5740104 A JPS5740104 A JP S5740104A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- oil leak
- pilot
- oil
- valve
- 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
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE: To prevent unexpected action due to oil leak, by providing an oil leak detection pump cylinder which generates pilot oil pressure for opening a pilot control valve only while a hydraulic cylinder is stopped and by closing a holding valve when the oil leak is detected.
CONSTITUTION: An oil leak detection pump cylinder 4, which has a pump chamber 4a, is provided. The pump cylinder 4 generates pilot oil pressure for opening a pilot control valve 13 only while a hydraulic cylinder 1 is stopped, without receiving load which acts to the cylinder 1 during its expansion or contraction. When oil leak is detected, a holding valve 9 is closed. When the stopped cylinder 1 is even slightly contracted by the load because of oil leak from a counterbalance valve 10 or a check valve 10a or because of the like, a pump cylinder 4 is contracted to cause the pilot oil pressure in the pump chamber 4a to open a control valve 13 so that the pilot pessure in an oil passage 11 is returned to a tank 5. As a result, the holding valve 9 is closed to keep the cylinder 1 from being contracted further. According to this constitution, minute oil leak is detected with the lapse of time to surely stop the action of the cylinder 1 in the direction of the load.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11536380A JPS5740104A (en) | 1980-08-23 | 1980-08-23 | Device for preventing hydraulic cylinder from acting due to oil leak |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11536380A JPS5740104A (en) | 1980-08-23 | 1980-08-23 | Device for preventing hydraulic cylinder from acting due to oil leak |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5740104A true JPS5740104A (en) | 1982-03-05 |
JPS6352246B2 JPS6352246B2 (en) | 1988-10-18 |
Family
ID=14660665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11536380A Granted JPS5740104A (en) | 1980-08-23 | 1980-08-23 | Device for preventing hydraulic cylinder from acting due to oil leak |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5740104A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50125501A (en) * | 1974-03-22 | 1975-10-02 | ||
JPS54156985A (en) * | 1978-05-31 | 1979-12-11 | Kobe Steel Ltd | Safety device of hydraulic circuit having a plurality of actuators |
-
1980
- 1980-08-23 JP JP11536380A patent/JPS5740104A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50125501A (en) * | 1974-03-22 | 1975-10-02 | ||
JPS54156985A (en) * | 1978-05-31 | 1979-12-11 | Kobe Steel Ltd | Safety device of hydraulic circuit having a plurality of actuators |
Also Published As
Publication number | Publication date |
---|---|
JPS6352246B2 (en) | 1988-10-18 |
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