Pitch change mechanism

Fluid reaction surfaces (i.e. – impellers) – Interrelated controls for impeller and drive means – Pitch adjustment related to drive brake or clutch operation

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Details

416129, 416160, 416162, B64C 1132

Patent

active

051747162

ABSTRACT:
The invention concerns a pitch change mechanism for an aircraft propeller in which a common ring gear (51) changes pitch of all propeller blades on a given rotor simultaneously. Motion of the ring gear (51) is induced by a planet (40)-and-carrier (101) system driven by a pinion (110). Acceleration of the pinion causes a change toward flat pitch. Deceleration of the pinion causes change toward feathered pitch. If the motor driving the pinion fails, a large deceleration occurs, driving the blades to a safe, feathered position.

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Article--"A New Design for a Contra-Prop"--Aeronautical Engineering.

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