Propeller pitch change mechanism

Details Propeller pitch change mechanism Propeller pitch change mechanism

1993-10-28

1995-07-11

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

416157R, 416165, B64C 1132

Patent

active

054315395

ABSTRACT:
The pitch change mechanism for a variable pitch propeller blade or Advanced Ducted Propulsor (ADP) interconnecting the pitch change actuator and the propeller blades of the type that includes a trunnion attached to the root of the propeller blade, the connecting mechanism includes in one embodiment a translating ball screw nut interconnecting the trunnion through a yoke and a cooperating sliding pin and arm connector. In another embodiment where a hydraulic piston is included in the pitch change actuator the cylindrical housing supports a plurality of circumferentially spaced pins that are in sliding relationship with a rod attached to the trunnion. The trunnions in both embodiments are extended to make the interconnections. Means are provided to prevent the blades from binding up during pitch change movements. This invention eliminates the heretofore utilized sliding anti-rotation spline and the multiple linkage connectors.

REFERENCES:
patent: 2792897 (1957-05-01), Dagrell
patent: 3628922 (1971-12-01), Sprenger
patent: 3920353 (1975-11-01), Bredsted
patent: 4718823 (1988-01-01), Dennison
patent: 4750862 (1988-06-01), Barnes et al.
patent: 5116209 (1992-05-01), Anglade et al.

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