Patent ID: 6702631
Filing Date: 2004-03-09
Classification: B63H,B64D,F16H

Abstract:
A transmission for converting an engine drive shaft rotation into coaxial counter-rotations for driving a pair of propellers, the transmission comprising:a fore driven gear having teeth, the fore driven gear coaxially affixable to an inner shaft, the inner shaft having means for affixing an outer propeller thereto to achieve rotation thereof; aft driven means comprising a flexible, continuous member affixable to a hollow outer shaft coaxial with the inner shaft, the outer shaft having means for affixing an inner propeller thereto to achieve rotation thereof; a drive shaft having an aft end rotatably affixable within the housing and a fore end having means for being rotatably driven; a fore drive gear coaxially affixed for corotation with the drive shaft and having gear teeth positioned for meshing with the fore driven gear teeth for driving the fore driven gear in a first direction; and aft drive means affixed for corotation with the drive shaft and having means for driving the flexible member in a second direction opposite the first direction.