Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1979-06-22
1980-08-12
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60447, 60452, F16H 3946
Patent
active
042166560
ABSTRACT:
A drive system has an engine that operates a control pump and a hydraulic variable-displacement drive pump having a control element and connected to a hydraulic motor. A servocylinder operates the control element of the drive pump and is pressurized through a control line connected to the control-pump output. A control valve is connected between the control line and the sump of the system and is connected to the hydraulic line between the motor and the drive pump to reduce pressure in the control line when the higher pressure of the line between the drive pump and the motor rises within a predetermined range. Thus it is possible with a substantially constant engine speed to produce a substantially constant output torque, with only the displacement of the pump and pressure in the lines between the pump and the motor varying by appropriate control of the control-line pressure.
REFERENCES:
patent: 2238060 (1941-04-01), Kendrick
patent: 3444689 (1969-05-01), Budzich
ZF-Controls for Hydrostatic Transmissions, Technical Report 1/73, Bruening Hydraulik GmbH.
Brueninghaus Hydraulik GmbH, B60K 17.sup.70 A8, Publ. Aug. 1972 Technischer Bericht 1/73, Hydrostatische Antriebe.
Geoghegan Edgar W.
Ross Karl F.
Zahnradfabrik Friedrichshafen AG
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