Pitch change bearing system

Details Pitch change bearing system Pitch change bearing system

1990-09-10

1992-05-05

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

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

Nonmetallic resilient mounting

416141, B64C 2735

Patent

active

051102595

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). The assembly allows for transmission of all applicable loads in a compact manner with significant compactness in the diametral direction due to the torsional motion sharing between bearing elements.

REFERENCES:
patent: 3231222 (1966-01-01), Scheutzow
patent: 3790302 (1974-02-01), Pascher
patent: 3829239 (1974-08-01), Rybicki et al.
patent: 4427340 (1984-01-01), Metzger et al.
patent: 4986735 (1991-01-01), Robinson

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