JPS5471275A - Three-pump joining circuit - Google Patents

Three-pump joining circuit

Info

Publication number
JPS5471275A
JPS5471275A JP13823477A JP13823477A JPS5471275A JP S5471275 A JPS5471275 A JP S5471275A JP 13823477 A JP13823477 A JP 13823477A JP 13823477 A JP13823477 A JP 13823477A JP S5471275 A JPS5471275 A JP S5471275A
Authority
JP
Japan
Prior art keywords
circuit
pump
valve
pumps
pressure
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
JP13823477A
Other languages
Japanese (ja)
Inventor
Akihisa Kawaguchi
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.)
Japan Steel Works Ltd
Original Assignee
Japan Steel Works 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 Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP13823477A priority Critical patent/JPS5471275A/en
Publication of JPS5471275A publication Critical patent/JPS5471275A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Positive-Displacement Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To provide the subject circuit wherein three pumps are provided thereby to make optimum the working speed and working power of a harmonic actuator of travelling speed or to prevent overload and engine stop.
CONSTITUTION: The oil pressure pump source is constituted by three pumps 1, 2 and 3, and the circuit of the first and second ppumps 1 and 2 is provided with main relief valves 5 and 6 and actuators 21, 21a and 22. The circuit of a third pump 3 is provided with an unloading circuit 9, a diversion valve 10 and a pilot direction change-over valve 11. This change-over valve 11 changes the pressures of the circuits of first and second pumps 1 and 2 into signals, and when both circuit pressure are substantially equal, the change-over valve 11 supplies the pressurized oil of the third pump 3 to said both circuits through check valces 13 and 14 while diversing the same by said diversion valve 10. When the difference in the pressure of boty circuits exceeds a predetermined value, the pressurized oils diversed by the diverssion valve 10 join ans are supplied to the pump circuit having higher pressure, whereby the operation of the actuator is smoothened.
COPYRIGHT: (C)1979,JPO&Japio
JP13823477A 1977-11-16 1977-11-16 Three-pump joining circuit Pending JPS5471275A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13823477A JPS5471275A (en) 1977-11-16 1977-11-16 Three-pump joining circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13823477A JPS5471275A (en) 1977-11-16 1977-11-16 Three-pump joining circuit

Publications (1)

Publication Number Publication Date
JPS5471275A true JPS5471275A (en) 1979-06-07

Family

ID=15217212

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13823477A Pending JPS5471275A (en) 1977-11-16 1977-11-16 Three-pump joining circuit

Country Status (1)

Country Link
JP (1) JPS5471275A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS566901A (en) * 1979-06-27 1981-01-24 Hitachi Constr Mach Co Ltd Hydraulic circuit for construction equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51111581A (en) * 1975-03-26 1976-10-01 Hitachi Constr Mach Co Ltd Oil circuit of oilhydraulic shovel

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51111581A (en) * 1975-03-26 1976-10-01 Hitachi Constr Mach Co Ltd Oil circuit of oilhydraulic shovel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS566901A (en) * 1979-06-27 1981-01-24 Hitachi Constr Mach Co Ltd Hydraulic circuit for construction equipment
JPS6225882B2 (en) * 1979-06-27 1987-06-05 Hitachi Construction Machinery

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