JPS56156502A - Oil pressure controller - Google Patents
Oil pressure controllerInfo
- Publication number
- JPS56156502A JPS56156502A JP5863780A JP5863780A JPS56156502A JP S56156502 A JPS56156502 A JP S56156502A JP 5863780 A JP5863780 A JP 5863780A JP 5863780 A JP5863780 A JP 5863780A JP S56156502 A JPS56156502 A JP S56156502A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- pump
- change
- valve
- over
- 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
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE: To obtain a pump discharge quantity substantially proportional to the operating quantity of the spool of a change-over valve spool by introducing a specific pressure oil to the pilot pressure of a discharge quantity controlling of a variable capacity type hydraulic pump driven by a prime mover.
CONSTITUTION: The variable capacity type hydraulic pump 2 driven by a prime mover 1 is provided with pump discharge quantity controlling servo motors 3a and 3b, and the discharged oil pressure of the pump 2 is applied to an actuator (not shown) via ports X and Y respectively of the change-over valves 5 and 5. This change-over valve 5 has a neutral by-pass passage 7, and when the change-over valve 5 is changed over to a neutral position, the pressure oil is allowed to the pressure oil to escape to a tank 6. In this case, a variable throttle valve 8 is interposed in a neutral by-pass passage 7, and the upstream side pressure of the valve 8 is connected to one serve motor 3b so that it is transmitted thereto as a pilot pressure of the servo motor 3b, and another servo motor 3a is controlled by using the discharged pressure of the pump 1 as a pilot pressure.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5863780A JPS56156502A (en) | 1980-05-06 | 1980-05-06 | Oil pressure controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5863780A JPS56156502A (en) | 1980-05-06 | 1980-05-06 | Oil pressure controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56156502A true JPS56156502A (en) | 1981-12-03 |
Family
ID=13090091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5863780A Pending JPS56156502A (en) | 1980-05-06 | 1980-05-06 | Oil pressure controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56156502A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6124802A (en) * | 1984-07-13 | 1986-02-03 | Hitachi Constr Mach Co Ltd | Control circuit for hydraulic pressure device |
US5180470A (en) * | 1989-06-05 | 1993-01-19 | The Regents Of The University Of California | Deposition of highly-oriented PTFE films and uses therefor |
-
1980
- 1980-05-06 JP JP5863780A patent/JPS56156502A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6124802A (en) * | 1984-07-13 | 1986-02-03 | Hitachi Constr Mach Co Ltd | Control circuit for hydraulic pressure device |
US5180470A (en) * | 1989-06-05 | 1993-01-19 | The Regents Of The University Of California | Deposition of highly-oriented PTFE films and uses therefor |
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