Aeronautics and astronautics – Aircraft structure – Details
Patent
1980-12-31
1983-08-23
Blix, Trygve M.
Aeronautics and astronautics
Aircraft structure
Details
244 53R, B64C 114
Patent
active
043999662
ABSTRACT:
A self-contained apparatus for moving the portions of a cowl covering the gas-generator portion of a turbofan jet engine includes a motor-driven pump for pumping hydraulic fluid from a reservoir mounted on the engine through a control circuit which selectively channels the fluid to actuators associated with each of the cowl portions to move the cowl portions to their desired positions. The hydraulic control circuit preferably includes solenoid-actuated valves associated with each of the actuators and operable to selectively permit flow of fluid into and out of the actuators as is desired to open and close the cowl portions. Another solenoid valve is provided to control passage of the fluid from the actuators back to the reservoir during the closing of the cowl portions. The speed of closure of the cowl portions is regulated by one-way flow restrictors in the outlet ports of the actuators that control the rate of flow of fluid out of the actuator. A manual drive is provided for the pump and is operable to permit actuation of the cowl moving apparatus during periods of power loss or motor failure.
REFERENCES:
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patent: 2551239 (1951-05-01), Bond
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patent: 3257757 (1966-06-01), Bedard
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patent: 4044973 (1977-08-01), Moorehead
Galy, C. D. "Airbus Hydraulic Power Always Available" Hydraulics & Pneumatics; vol. 25, No. 12, Dec. 1972, pp. 57-60.
Crudden Eric H.
Jessen P. Jay
Blix Trygve M.
Sotelo Jesus D.
The Boeing Company
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