Helicopter rotors

Details Helicopter rotors Helicopter rotors

1977-05-09

1978-07-11

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

416141, B64C 2738

Patent

active

040998924

ABSTRACT:
A helicopter rotor includes a rotor hub and a plurality of rotor blades, the rotor hub comprising, for each rotor blade, a flexure member extending generally radially from the hub and being flexible in a blade flap plane. A feathering hinge is located at an outer end of the flexure member and includes a cylindrical portion mounted on an extension of the flexure member and resilient means arranged to permit blade lead and lag movements of the cylindrical portion during operation. In a described embodiment, the cylindrical portion is mounted on axially spaced apart bearings comprising an inner part spherical bearing having a geometrical center and an outer parallel bearing, and a resilient elastomer ring is interposed between the outer bearing and the cylindrical portion so as to permit pivotal movement of the cylindrical portion about the geometrical center of the inner bearing.

REFERENCES:
patent: 2949967 (1960-08-01), Jovanovich
patent: 3026942 (1962-03-01), Cresap
patent: 3231222 (1966-01-01), Scheutzow
patent: 3297094 (1967-01-01), Kisovec
patent: 3545880 (1970-12-01), Mouille
patent: 3610774 (1971-10-01), Mouille
patent: 3762834 (1973-10-01), Bourquardez et al.
patent: 3807896 (1974-04-01), Johnson
patent: 3926536 (1975-12-01), Ciastula et al.

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