Pitch adjustment assembly for bearingless main rotors

Details Pitch adjustment assembly for bearingless main rotors Pitch adjustment assembly for bearingless main rotors

1994-11-09

1995-10-24

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

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

Nonmetallic resilient mounting

416138, 416140, 416141, 416 61, 2671402, B64C 2735

Patent

active

054604877

ABSTRACT:
A pitch adjustment assembly (100) for a bearingless rotor assembly (20) which includes a torque tube member (36) enveloping a flexbeam connector (22), which torque tube member (36) defines a geometric center (120) and is operative to impart pitch motion to the rotor blade assembly (20). The pitch adjustment assembly (100) includes a centering bearing (70) for centering an inboard end (38) of the torque tube member (36) relative to the flexbeam connector (22), wherein the centering bearing (70) defines a torque tube pivot point (110) about which the torque tube member (36) is rotationally displaced relative to the flexbeam connector (22), a pitch control rod (48) mechanically connecting to a pitch control arm (46) for imparting pitch control inputs to the torque tube member (36); wherein the pitch control rod and arm (46, 48) define an input pivot point (116) and, a displacement mechanism (102 or 140), in combination with the centering bearing (70), for effecting translational displacement of the geometric center (120) of the torque tube member (36) relative to the torque tube and input pivot points (110, 116). The displacement mechanism (102 or 140) cooperates with the centering bearing (70) to effect translational displacement of the torque tube inboard end (38) while maintaining the spatial position of the input pivot point (116) relative to the torque tube pivot point (110). Adjustment shims (102) or a jacking arrangement (140) is used to effect the translational displacement of the torque tube member (36).

REFERENCES:
patent: 4244677 (1981-01-01), Noehren et al.
patent: 4690616 (1987-09-01), Hahn et al.
patent: 4778343 (1988-10-01), Hahn et al.
patent: 5092738 (1992-03-01), Byrnes et al.
patent: 5199849 (1993-04-01), Leman

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