Power plants – Pressure fluid source and motor – Coaxial impeller and turbine unit
Patent
1981-10-09
1985-05-21
Cohen, Irwin C.
Power plants
Pressure fluid source and motor
Coaxial impeller and turbine unit
60421, 60422, 60452, 91516, 91532, 180132, 188264P, B62D 506, F15B 1116, F15B 1306, F16D 3300
Patent
active
045178003
ABSTRACT:
A control system has two fixed-displacement pumps for supplying pressurized fluid to a pair of steering cylinders via a steering valve and to a pair of implement cylinders via an implement valve. Connected next to the pumps is a demand valve which is pilot operated to deliver to the steering cylinder pair the pressurized fluid from only one pump upon slight displacement of the steering valve and the pressurized fluid from both pumps upon greater displacement of the steering valve. The demand valve is further pilot operated to deliver to the implement cylinder pair the pressurized fluid from only one pump when the implement valve is actuated in a direction to lower the implement assembly, and the pressurized fluid from both pumps when the implement valve is actuated in a direction to raise the implement assembly. In additional embodiments the pumps are of the variable-displacement type, with their displacement adjusted by servo controls responsive to the pressure of the fluid being drained from the demand valve.
REFERENCES:
patent: 2892311 (1959-06-01), Gerpen
patent: 3535877 (1970-10-01), Becker et al.
patent: 3987623 (1976-10-01), Bianchetta
patent: 4033236 (1977-07-01), Johnson et al.
patent: 4037410 (1977-07-01), Jackson et al.
patent: 4044786 (1977-08-01), Yip
patent: 4321793 (1982-03-01), Uranaka
Karakama Tadao
Uehara Kazuo
Cohen Irwin C.
Kabushiki Kaisha Komatsu Seisakusho
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