Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1983-10-03
1986-01-28
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60445, 60447, 60448, 60449, F16H 3946
Patent
active
045662746
ABSTRACT:
Disclosed is a control arrangement for a hydrostatic drive of the type having a power-driven adjustable pump, a pressure responsive setting cylinder coupled to the pump, a hydraulic motor connected via pressure conduits to the pump and a measuring motor coupled to the hydraulic motor to rotate with a proportional rotary speed. A supply pump is connected in a control circuit including the measuring motor and a nominal or desired value generator in the form of an adjustable throttle by means of which the desired rotary speed of the hydraulic motor is adjusted. Deviations between the actual and desired speeds produce a differential control flow which is fed to the setting cylinder which adjusts the position of an adjusting member of the pump for so long as until the deviation equals zero.
REFERENCES:
patent: 3693349 (1972-09-01), Morris
patent: 3932993 (1976-01-01), Riedhammer
patent: 4168612 (1979-09-01), Nikolaus
Heiser Joachim
Weigle Dieter
Garrett Robert E.
Husar John M.
Robert & Bosch GmbH
Striker Michael J.
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