| 摘要 |
A composite torque tube (10) for a bearingless main rotor (BMR) assembly (100) that is optimally fabricated to meet torsional stiffness, fatigue strength, and buckling strength design constraints at minimal unit weight. The composite torque tube (10) includes a strengthened inboard section (12) for mechanically coupling the torque tube (10) in combination with the hub structure (120) of the BMR assembly, a strengthened outboard section (16) for mechanically coupling the torque tube (10) in combination with a corresponding main rotor blade, and an intermediate section (14) that is operative to accomodate the pitch; flapwise, and/or edgewise loads acting on the BMR assembly during operation thereof. The intermediate section (14) of the torque tube (10) has a constant wall thickness and is formed from continuous filament windings having a predetermined fiber orientation within a broad range of about +/- 18.degree. to about +/- 40.degree. and/or a narrow range of about +/- 26.degree. to about +/- 35.degree.. The torque tube (10) is preferably formed from continuous filament windings having an optimal fiber orientation of about +/- 35.degree. to provide an intermediate section (14) having a minimal torque tube wall thickness.
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