Propeller pitch change system

Details Propeller pitch change system Propeller pitch change system

2007-11-20

2007-11-20

Kershteyn, Igor (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

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

Plural diverse condition responsive

C416S048000

Reexamination Certificate

active

11248823

ABSTRACT:
A pitch change system includes a yoke assembly which receives a pitch trunnion that extends from each propeller blade assembly. Each pitch trunnion is received within a respective bearing assembly mounted in the yoke assembly. The bearing assemblies are mounted between a forward yoke plate and an aft yoke plate. A spacer is mounted between each adjacent bearing assembly to position and restrain each bearing assembly. Each spacer includes an extension which retains the adjacent bearing assembly on a pitch trunnion pin in a direction generally parallel to axis. Each of the bearing assemblies includes a generally rectilinear outer race and a spherical inner race inside diameter to receive the pitch trunnion pin. The rectilinear outer race reduces contact stresses to acceptable levels for high load applications yet permits blade installation without actuator disassembly.

REFERENCES:
patent: 2640555 (1953-06-01), Cushman
patent: 5431539 (1995-07-01), Carvalho
patent: 6511292 (2003-01-01), Perkinson et al.
patent: 6981844 (2006-01-01), Perkinson et al.

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