Pitch change actuation system

Details Pitch change actuation system Pitch change actuation system

1989-04-21

1990-06-19

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

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

Impeller rotation speed responsive

415129, 416158, 416160, B64C 1106

Patent

active

049349015

ABSTRACT:
A self-locking pitch change actuator is configured to fit within an annular hub (34). A ring gear (40) is driven circumferentially by a tangentially oriented ballscrew (42) and traveler (44). The ballscrew (42) is driven by a hydraulic motor (50) controlled responsive to an electric pitch change motor (74). A pitchlock (62) is positioned by the collective actions of the ballscrew (42) and pitch change motor (74), with any movement relative to a preselected null position driving the hydraulic motor beta control valve (60) into an operative position.

REFERENCES:
patent: 2666490 (1954-01-01), Richmond
patent: 3467198 (1969-09-01), Ellinger
patent: 3687569 (1972-08-01), Klompas
patent: 3866415 (1975-02-01), Ciokajlo
patent: 4738590 (1988-04-01), Butler
patent: 4738591 (1988-04-01), Butler
patent: 4810164 (1989-03-01), Wright

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