Pumps – Convertible to apparatus of a different class
Patent
1984-12-24
1986-08-12
Freeh, William L.
Pumps
Convertible to apparatus of a different class
417271, 74730, 74675, 74789, F04B 3500, F16H 3914, F16H 3900
Patent
active
046053581
ABSTRACT:
In many aircraft, there are flight control surfaces positioned by mechanical actuation systems that are driven by hydraulic power drive units. There are also devices for transmitting hydraulic power from one aircraft hydraulic system to another in the event that one of the system's pumps fails. An integration of structure to perform both of these functions in a single unit would result in a reduction in cost and weight as well as increased reliability. The integrated power drive and power transfer system has a pair of variable displacement hydraulic devices each in a separate hydraulic circuit and each having a drive shaft connected into a summing gear train connected to an output shaft. A selectively-operable brake is in the operative connection between the output shaft and the summing gear train and controls either driving of the output shaft with both variable displacement hydraulic devices operating as motors or transfer of power between the hydraulic circuits with one variable displacement hydraulic device operating as a motor and the other as a pump.
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Freeh William L.
Sundstrand Corporation
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