Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1977-07-05
1978-06-27
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60462, 60486, 60487, 60445, F15B 1518, F15B 1116
Patent
active
040966941
ABSTRACT:
A fluid drive assembly has a pump, a variable displacement motor, a fluid circuit connecting the pump to the motor, and an actuator device for controlling the displacement of the motor. The actuator device is movable between a first position at which the displacement of the motor is at a preselected maximum and a second position at which the displacement of the motor is at a preselected minimum. A control system for the fluid drive assembly includes a source of fluid at a first preselected pressure value. A valve device is connected to the source of fluid and to the actuator device for controlling the fluid flow therebetween and is movable between a first position at which the source of fluid is in communication with the actuator device and a second position at which the source of fluid is blocked from communication with the actuator device. A first device automatically moves the valve device to the second position in response to the fluid pressure in the fluid circuit exceeding a second preselected pressure level. A second device retains the valve device in the first position until the fluid pressure in the fluid circuit decreases from the second preselected pressure level to a third preselected pressure level.
REFERENCES:
patent: 3411297 (1968-11-01), Hann
patent: 3768263 (1973-10-01), Olson et al.
patent: 3972186 (1976-08-01), Humphreys et al.
Habiger Cyril W.
Hicks Leon E.
Caterpillar Tractor Co.
Geoghegan Edgar W.
Grant John W.
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