JPS5519919A - Control circuit for variable discharge pump - Google Patents

Control circuit for variable discharge pump

Info

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
Application number
JP9152278A
Other languages
Japanese (ja)
Inventor
Yoshito Sato
Tadashi Yoda
Kazuhiro Yoshida
Yukio Moriya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP9152278A priority Critical patent/JPS5519919A/en
Publication of JPS5519919A publication Critical patent/JPS5519919A/en
Pending legal-status Critical Current

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
JP9152278A 1978-07-28 1978-07-28 Control circuit for variable discharge pump Pending JPS5519919A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

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