Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1998-03-05
1999-06-01
Ryznic, John E.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60444, F04B 126, F16D 3102
Patent
active
059079517
ABSTRACT:
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.
REFERENCES:
patent: 3871178 (1975-03-01), Tominaga
patent: 4196588 (1980-04-01), Johnson
patent: 4481770 (1984-11-01), Lohbauer et al.
patent: 4712377 (1987-12-01), Yoshida et al.
Hirata Toichi
Ishikawa Kouji
Nakamura Tsuyoshi
Sugiyama Genroku
Toyooka Tsukasa
Hitachi Construction Machinery Co. Ltd.
Ryznic John E.
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