JPS5471275A - Three-pump joining circuit - Google Patents
Three-pump joining circuitInfo
- 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
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
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)
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)
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 |
-
1977
- 1977-11-16 JP JP13823477A patent/JPS5471275A/en active Pending
Patent Citations (1)
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)
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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