Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1977-06-16
1978-08-15
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60449, F16H 3946
Patent
active
041062922
ABSTRACT:
An underspeed actuator has a piston connected to a control means of a first pump driven by a prime mover and is movable between a first position at which the first pump is at minimum displacement and a second position at which the first pump is at maximum displacement. The underspeed actuator has first and second actuating chambers at opposite ends of the piston and a biasing device urging the piston towards the first position. The piston is movable between the first and second positions in response to pressure differential in said first and second chambers. A signal device controllably develops first and second control signals in response to the operating speed of the prime mover and delivers said first and second signals to respective first and second chambers. A first device controllably reduces the magnitude of fluid pressure in the first chamber in response to the rate of pressure rise of the output fluid of said first pump exceeding a preselected rate of pressure rise.
REFERENCES:
patent: 3054263 (1962-09-01), Budzich et al.
patent: 3952514 (1976-04-01), Habiger
patent: 3952515 (1976-04-01), Habiger et al.
Caterpillar Tractor Co.
Geoghegan Edgar W.
Grant John W.
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