Pitch change bearing system

Details Pitch change bearing system Pitch change bearing system

1989-10-13

1991-01-22

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

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

Nonmetallic resilient mounting

416141, B64C 2735

Patent

active

049867350

ABSTRACT:
A pitch change bearing assembly for a helicopter hub (10) having a yoke (14) and a grip (12) includes a shaft (24) having first and second ends (24a, 24b). A first radial elastomeric bearing (60) is disposed on the first end (24a) of the shaft (24). A second radial elastomeric bearing (62) is disposed on the second end (24b) of the shaft (24). The first and second radial elastomeric bearings (60, 62) are disposed parallel to one another. A third radial elastomeric bearing (66) is disposed on the shaft between and spaced apart from the first (60) and second (62) radial elastomeric bearings and is parallel to the first and second radial elastomeric bearings (60, 62). Structure (28, 30) is provided for attaching the third radial elastomeric bearing (66) to the grip (12). Structure (48, 50) is further provided for attaching the first and second radial elastomeric bearings (60, 62) to the yoke (14).

REFERENCES:
patent: 1931026 (1933-10-01), Lee
patent: 3362765 (1968-01-01), Pierce
patent: 3556673 (1971-01-01), Killian
patent: 3782854 (1974-01-01), Rybicki
patent: 3807896 (1974-04-01), Johnson
patent: 3829239 (1974-08-01), Rybicki et al.
patent: 3942910 (1976-03-01), Snyder et al.
patent: 4522563 (1985-06-01), Reyes et al.
patent: 4543040 (1985-09-01), McArdle et al.
patent: 4549850 (1985-10-01), Vincent
"Elastomeric Bearing Application to Helicopter Tail Rotor Designs", by C. H. Fegan, Oct. 1968, Edition of American Helicopter Society Journal, pp. 13-15.

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