JPS56139318A - Liquid pressure circuit for construction machine - Google Patents
Liquid pressure circuit for construction machineInfo
- Publication number
- JPS56139318A JPS56139318A JP3911580A JP3911580A JPS56139318A JP S56139318 A JPS56139318 A JP S56139318A JP 3911580 A JP3911580 A JP 3911580A JP 3911580 A JP3911580 A JP 3911580A JP S56139318 A JPS56139318 A JP S56139318A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- supplied
- pumps
- pump
- during
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE:To prevent the occurrence of hunting due to a too high gain and the deterioration of respondence by a method in which during the rated-speed turning, the discharge pressure of one variable capacity pump is supplied to the circuit, but when the low-speed turning, the discharge pressures of plural variable pumps are diverted to the circuit. CONSTITUTION:The discharge pressures P1 and P2 of two variable capacity pumps 1 and 2 are supplied to a steering cylinder 15 through a demand valve 6 and steering valve 8 and also partly to the cylinder 23 of operating machine through a closed center valve 13. During the high-speed operation of engine, the discharge pressure P1 of the pump 1 is supplied to the circuit through the position 62 of the demand valve 6, and also the discharge pressure P2 of the pump 2 is drained to a pipeline 10. Also, during the low-speed operation, the discharge pressures P1 and P2 of the pumps 1 and 2 are jointed to allow the operations of both the steering and the operating machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3911580A JPS56139318A (en) | 1980-03-28 | 1980-03-28 | Liquid pressure circuit for construction machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3911580A JPS56139318A (en) | 1980-03-28 | 1980-03-28 | Liquid pressure circuit for construction machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56139318A true JPS56139318A (en) | 1981-10-30 |
Family
ID=12544076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3911580A Pending JPS56139318A (en) | 1980-03-28 | 1980-03-28 | Liquid pressure circuit for construction machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56139318A (en) |
-
1980
- 1980-03-28 JP JP3911580A patent/JPS56139318A/en active Pending
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