Pitch adjustment assembly for bearingless main rotors

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

B - Operations, Transporting

64

C

B64C 27/33 (2006.01) B64C 27/35 (2006.01)

Patent

CA 2204901

A pitch adjustment assembly (100) for a bearingless rotor assembly (20) which includes a torque tube member (36) enveloping a flexbeam connector (22). 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). Adjustment shims (102) or a jacking arrangement (140) is used to effect the translational displacement of the torque tube member (36).

Un ensemble de réglage de pas (100), destiné à un ensemble rotor (20) sans roulement, comprend un tube de couple (36) enveloppant un raccord à plaque de flexion (22). L'ensemble de réglage de pas (100) comporte un roulement de centrage (70) destiné à centrer une extrémité interne (38) du tube de couple (36) par rapport au raccord à plaque de flexion (22), de façon que ce roulement decentrage (70) définisse un point de pivotement (110) du tube de couple autour duquel ce tube de couple (36) tourne par rapport au raccord à plaque de flexion (22). Une bielette de commande de pas (48) est reliée mécaniquement à un bras de commande de pas (46) pour transmettre des commandes de pas au tube de couple (36). La bielette et le bras de commande de pas (48, 46) définissent un point de pivotement de commandes (116), et un mécanisme de déplacement (102 ou 140), combiné avec le roulement de centrage (70), réalisent le déplacement en translation du centre géométrique (120) du tube de couple (36) par rapport au tube de couple et aux points depivotement de commandes (110, 116). Des cales de réglage (102) ou un dispositif à vérin (140) permet le mouvement en translation du tube decouple (36).

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