JPS5519919A - Control circuit for variable discharge pump - Google Patents
Control circuit for variable discharge pumpInfo
- Publication number
- JPS5519919A JPS5519919A JP9152278A JP9152278A JPS5519919A JP S5519919 A JPS5519919 A JP S5519919A JP 9152278 A JP9152278 A JP 9152278A JP 9152278 A JP9152278 A JP 9152278A JP S5519919 A JPS5519919 A JP S5519919A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- valve
- discharge
- proportion
- pump
- 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
- Reciprocating Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: Constitution of a variable discharge pump to be able to be controlled increasingly or decreasingly by a servo valve and a servo cylinder makes the discharge amount of the pump possible to increase or decrease in proportion to the operating strokes of a change-over valve to control to supply of oil pressure to an actuator.
CONSTITUTION: With increase of load to work on an actuator 4, when discharge pressure P1 of a pump 1 has come over a setpoint PL in low pressure, if a pilot change-over valve 23 is controlled, as pressure Pa increased or decreased in proportion to the discharge pressure P1 is increased or decreased in proportion to the operating strokes by a second control valve 36, pressure Pc supplied to a pilot pressured part 24 of a servo valve 19 increases or decreases in proportion to the operating strokes by taking the pressure Pa as the upper limit. And when the discharge pressure P1 has gone up beyond high pressure setpoint PH, the discharge pressure P1 is supplied to a third control valve 40, the valve 40 moves in the direction of decreasing the pressure resulting in dropping the pressure PC to the servo valve 19 and minimizing its discharge amount QC.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9152278A JPS5519919A (en) | 1978-07-28 | 1978-07-28 | Control circuit for variable discharge pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9152278A JPS5519919A (en) | 1978-07-28 | 1978-07-28 | Control circuit for variable discharge pump |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5519919A true JPS5519919A (en) | 1980-02-13 |
Family
ID=14028739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9152278A Pending JPS5519919A (en) | 1978-07-28 | 1978-07-28 | Control circuit for variable discharge pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5519919A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57163187A (en) * | 1981-03-30 | 1982-10-07 | Kawasaki Heavy Ind Ltd | Fluid controlling apparatus for variable displacement type pump |
US4596517A (en) * | 1985-01-29 | 1986-06-24 | Poclain | Pressurized fluid supply circuit comprising a variable displacement pump |
-
1978
- 1978-07-28 JP JP9152278A patent/JPS5519919A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57163187A (en) * | 1981-03-30 | 1982-10-07 | Kawasaki Heavy Ind Ltd | Fluid controlling apparatus for variable displacement type pump |
US4596517A (en) * | 1985-01-29 | 1986-06-24 | Poclain | Pressurized fluid supply circuit comprising a variable displacement pump |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS57154503A (en) | Pressurized fluid feeder | |
JPS5519919A (en) | Control circuit for variable discharge pump | |
JPS5587865A (en) | Control circuit of variable capacity pump | |
JPH01165766U (en) | ||
JPS57167501A (en) | Control circuit of fluid | |
JPS5769161A (en) | Control method for hydraulic actuator apparatus | |
JPS56120802A (en) | Oil pressure control | |
JPS5639307A (en) | Controller for fluid | |
JPS5768543A (en) | Control device for engine | |
JPS54101068A (en) | Controller of variable volume type hydraulic pressure motor | |
JPS54128808A (en) | Control method for gas booster or the like | |
JPS57127106A (en) | Hydraulic driving circuit | |
JPS5519904A (en) | Discharge flow control equipment of variable capacity pump | |
JPS5690158A (en) | Slewing drive controller | |
JPS57131890A (en) | Oil hydraulic controller | |
JPS55116932A (en) | Controling method of hydraulic shovel | |
JPS56159584A (en) | Oil pressure control circuit for construction machine | |
JPS57116969A (en) | Oil pressure closed circuit driven by hydraulic motor | |
JPS5768536A (en) | Fuel injection timing regulator | |
JPS5520929A (en) | Cylinder controller | |
JPS5279195A (en) | Piston positional shift regulating controller | |
JPS6480204A (en) | Control device for position of working machine based on ground | |
JPS5618102A (en) | Compound valve | |
JPS5737150A (en) | Hydraulic pressure controller for closed circuit | |
JPS5375501A (en) | Pump flow controller |