Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1997-10-24
1999-09-14
Ryznic, John E.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60486, F16D 3102
Patent
active
059504315
ABSTRACT:
A tandem pump apparatus having a first hydraulic pump for supplying operating fluid to a first actuator and a second hydraulic pump for supplying operating fluid to a second actuator in cooperation with each other is disclosed. Each hydraulic pump is provided with a flow rate control valve for refluxing a surplus of flow discharged from the pump to a suction side of the pump through a relief passage. A connecting passage connects the first relief passage downstream from the first flow rate control valve and the second relief passage downstream from the second flow rate control valve. A check valve is provided in the connecting passage for allowing operating fluid to flow from one of the relief passages that has a relatively great reflux flow rate to the other relief passage having a relatively small reflux flow rate, thereby ensuring sufficient supercharge into the two pump to achieve sufficient restraint of cavitation.
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patent: 4798050 (1989-01-01), Nakamura et al.
patent: 4825659 (1989-05-01), Huydts
patent: 5615553 (1997-04-01), Lourigan
Aisin Seiki Kabushiki Kaisha
Ryznic John E.
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