Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1985-03-20
1987-09-22
Chambers, A. Michael
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60437, 60444, 417213, 417218, F16D 3102
Patent
active
046946489
ABSTRACT:
An anti-plug control for a drive to prevent jamming of a driven working element in response to an overload wherein said drive includes a hydrostatic transmission having a variable displacement unit and a fixed displacement unit connected in closed circuit. A servo control cylinder is connected to a swash plate of the variable displacement unit for causing positioning thereof. A normally closed pressure-responsive valve monitors the pressure in the high pressure side of the closed circuit and is openable when the pressure reaches a predetermined value to deliver fluid from the closed circuit to the servo control cylinder and modify the displacement of the variable displacement unit to increase the speed of the working element to attempt clearing the overloaded condition of the working element.
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Frank Yeaple, Fluid Power Design Handbook, 1984, p. 109 (FIG. 6.8).
Chambers A. Michael
Sundstrand Corporation
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