B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
138/41.14
B62D 11/18 (2006.01) F04B 49/00 (2006.01) F16H 61/46 (2006.01)
Patent
CA 1089327
CONTROL SYSTEM FOR A FLUID DRIVE Abstract of the Disclosure 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 pre- selected pressure level.
301887
Habiger Cyril W.
Hicks Leon E.
Caterpillar Tractor Co.
Kirby Eades Gale Baker
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