Patent ID: 6428443
Filing Date: 2002-08-06
Classification: B64C,F16H

Abstract:
A gearbox for driving a rotor having a rotor axis, comprising:(a) a rotor sun gear coaxial and co-rotational with the rotor; (b) a stationary sun gear coaxial with the rotor sun gear; (c) at least one planet having an axis parallel to said rotor sun gear axis, said planet comprising a first planetary gear in meshing engagement with said stationary sun gear, and a second planetary gear in meshing engagement with said rotor sun gear, wherein said first planetary gear has a first planetary pitch diameter, said second planetary gear has a second planetary pitch diameter, said first planetary pitch diameter is different from said second planetary pitch diameter, and said first planetary gear is co-rotational with said second planetary gear; (d) a first ring gear coaxial with the rotor, said first ring gear having internal teeth in meshing engagement with said first planetary gear; (e) means for rotating said first ring gear at a first rotational speed; (f) a second ring gear coaxial with the rotor, said second ring gear having internal teeth in meshing engagement with said second planetary gear; and (g) means for rotating said second ring gear at a second rotational speed, said second rotational speed different from said first rotational speed.