Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1982-02-05
1984-07-17
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60445, F16H 3946
Patent
active
044598076
ABSTRACT:
A fluid pressure system has a reservoir and a variable delivery pump having an inlet connected to the reservoir and an outlet. A control valve connected to a control motor and feedback line with the feedback line adapted to control the fluid flow to and from the control motor to vary the pump displacement, to maintain the pressure at the pump outlet at a difference above the pressure in the feedback line. A control valve is adapted to control the fluid flow between the outlet, the load motor and the reservoir. The control valve is adapted to control the fluid flow between the load motor, the reservoir and a control line and is operable in a neutral position to block off the pump outlet from the load motor and to connect said control line to the reservoir. The control valve is operable to another position which connects said load motor to the control line before the pump outlet is connected to the load motor. A regulating valve is connected to and responsive to the control line and adapted to control fluid flow between the pump outlet and the control valve and to maintain the pressure to the control valve a difference above the pressure in the load motor. The regulating valve further is adapted to provide continuous fluid communication between the control valve and the feedback line to allow the control valve to operate the control motor to increase or decrease the output volume and pressure of the source of fluid pressure to a level above that in the load motor before the pump outlet is connected to the load motor and to allow the control valve to reduce the output volume and pressure of the source of fluid pressure when the control valve is in the neutral position.
REFERENCES:
patent: 3635021 (1972-01-01), McMillen et al.
patent: 3935707 (1976-02-01), Murphy et al.
patent: 3987622 (1976-10-01), Johnson
patent: 4028889 (1977-06-01), Budzich
Koppen and Lethem AG
Look Edward K.
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