Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1977-06-16
1978-06-13
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60449, F16H 3946
Patent
active
040941450
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 toward 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. First and second conduits deliver said first and second control signals to said first and second chambers, respectively. A shunt valve is connected to the first and second conduits for passing fluid expelled from the first chamber to the second chamber in response to said flow of fluid exceeding a preselected flow rate.
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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