Bearingless main rotor assembly torque tube

Details Bearingless main rotor assembly torque tube Bearingless main rotor assembly torque tube

1993-01-08

1993-09-07

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

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

Nonmetallic resilient mounting

416230, B64C 2732

Patent

active

052422674

ABSTRACT:
A composite torque tube for a bearingless main rotor (BMR) assembly that is optimally fabricated to meet torsional stiffness, fatigue strength, and buckling strength design constraints at minimal unit weight. The composite torque tube includes a strengthened inboard section for mechanically coupling the torque tube in combination with the hub structure of the BMR assembly, a strengthened outboard section for mechanically coupling the torque tube in combination with a corresponding main rotor blade, and an intermediate section that is operative to accommodate the pitch, flapwise, and/or edgewise loads acting on the BMR assembly during operation thereof. The intermediate section of the torque tube 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 is preferably formed from continuous filament windings having an optimal fiber orientation of about +/-35.degree. to provide an intermediate section having a minimal torque tube wall thickness.

REFERENCES:
patent: 4292009 (1981-09-01), Weiland et al.
patent: 4381902 (1983-05-01), Head et al.
patent: 4568246 (1986-02-01), Hibyan et al.
patent: 4676720 (1987-06-01), Niwa et al.
patent: 4676853 (1987-06-01), Lerma
patent: 4963215 (1990-10-01), Ayers
patent: 5059094 (1991-10-01), Robinson et al.

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