发明名称 |
Hydraulic control system for construction machine |
摘要 |
A hydraulic control system according to the present invention for a construction machine is provided with a directional control valve switchable by a pilot control valve, a hydraulic cylinder, a pilot pump, a selector valve for selecting one of a maximum value out of pilot pressures of the pilot control valve, a flow control unit for controlling the flow rate of a variable displacement hydraulic pump, a pressure-reducing valve for converting a delivery pressure of the pilot pump to a pump control signal, which controls driving of the flow control unit, in accordance with a pilot pressure guided to a first signal line connected to the selector valve, a branch line connecting the pilot pump and the pressure-reducing valve with each other, and a second signal line for guiding the pump control signal, which has been converted at the pressure-reducing valve, to the flow control unit.
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申请公布号 |
US5907951(A) |
申请公布日期 |
1999.06.01 |
申请号 |
US19980035334 |
申请日期 |
1998.03.05 |
申请人 |
HITACHI CONSTRUCTION MACHINERY CO., LTD. |
发明人 |
TOYOOKA, TSUKASA;HIRATA, TOICHI;SUGIYAMA, GENROKU;ISHIKAWA, KOUJI;NAKAMURA, TSUYOSHI |
分类号 |
F04B49/00;E02F9/22;(IPC1-7):F04B1/26;F16D31/02 |
主分类号 |
F04B49/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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