Pitch change actuation system

Details Pitch change actuation system Pitch change actuation system

B - Operations, Transporting

64

C

60/85

B64C 1/06 (2006.01) B64C 11/32 (2006.01) F01D 7/00 (2006.01)

Patent

CA 2013856

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.

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