Power drive unit

Details Power drive unit Power drive unit

1983-12-12

1986-04-01

Garrett, Robert E.

Motors: expansible chamber type

Application of motive fluid at different pressures to...

Double acting motor reversed by pressure variation of motive...

91380, 91506, 60451, F01B 306

Patent

active

045790396

ABSTRACT:
A power drive unit for thrust reverser structure includes a reversible motor in a hydraulic circuit and has normal stow and deploy cycles of operation. In a deploy cycle, the load on the motor is aiding and, in the event the deploy cycle is inadvertent, the load on the motor can be substantially higher. In order to avoid this increased loading on the motor in an inadvertent deploy cycle, the hydraulic circuit has an auto-restow valve which senses the high aiding load in the event of an inadvertent deploy operation and changes the operation of the power drive unit to operate the motor in a stow cycle to prevent continued high loading on the motor and thrust reverser structure.

REFERENCES:
patent: 3789736 (1974-02-01), Williams
patent: 3791586 (1974-02-01), Moorehead
patent: 4191094 (1980-03-01), Flippo
patent: 4210066 (1980-07-01), Aldrich
patent: 4213298 (1980-07-01), Milgram
patent: 4422605 (1983-12-01), Fage

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