Variable-pitch bladed rotors

Details Variable-pitch bladed rotors Variable-pitch bladed rotors

1986-06-30

1988-01-05

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With weight-balancing means

Self-shifting or selectively adjustable mass

416 89, 416147, 416205, B64C 1132

Patent

active

047173122

ABSTRACT:
A variable-pitch bladed rotor including a plurality of blades extending outwardly from a hub in which they are each mounted by a respective ball-screw device. Each device comprises inner and outer races each provided with at least one helical groove, a plurality of balls co-operable with the grooves, and a cylindrical cage disposed between the races which is suitably apertured for accommodation of the balls. The cage supports gearing so associated with the inner and outer races that on pitch-change movement of the respective blade the cage is positively driven, thereby to turn about the blade longitudinal axis.

REFERENCES:
patent: 2307101 (1943-01-01), Blanchard et al.
patent: 2423400 (1947-07-01), Nichols
patent: 2425938 (1947-08-01), Hoover
patent: 2460559 (1949-02-01), Wildhaber
patent: 2514477 (1950-07-01), Cushman
patent: 2518431 (1950-08-01), Wildhaber
patent: 2533358 (1950-12-01), Cushman
patent: 2566696 (1951-09-01), Cushman
patent: 3794442 (1974-02-01), McMurtry

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