Modular propeller blade pitch actuation system

Details Modular propeller blade pitch actuation system Modular propeller blade pitch actuation system

1986-11-28

1988-06-14

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

416 48, 416157R, 416160, 416165, B64C 1138

Patent

active

047508620

ABSTRACT:
A modular, easily replaceable, pitch actuation system is removably secured within the hub of an aircraft. The modular system houses a driving system which provides a rotational output to set the pitch of propeller blades mounted to the hub, and a pitch changing system that controls the driving system. The driving system includes a high-speed, low-torque hydraulic motor that drives an harmonic drive to amplify the torque of the motor. The pitch changing system includes an actuator which positions a valve that controls the hydraulic motor, and a nulling gear which repositions the valve and acts as a pitch lock.

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Examiner's Report to the Comptroller, 30 Dec. 1987.

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