Device with multiple reduction gear transmission between a drive shaft and a pair of propellers coaxial with this shaft
AssigneeSnecma
InventorAdrien Jacques Philippe Fabre
Life of this patent
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Abstract
A transmission to drive two propellers through a single shaft comprises several, generally three planetary gear systems, each of which comprises one principal element directly supported on fixed surrounding structures that resist cantilever forces, support the rotating bodies and carry fluid and electrical cable ducts to control the operation of the downstream propeller elsewhere than through the central shaft of the machine in which the volume is reduced.
Claims12
Aircraft propulsion device comprising a drive shaft, a pair of propellers coaxial with the drive shaft, and a transmission between the drive shaft and the pair of propellers, the transmission including a planetary gearing speed reduction device for the drive shaft, the reduction device comprising a plurality of planetary gear systems each comprising a toothed sun gear, a toothed ring gear and toothed planet gears mounted on a planet gear carrier and each engaged with the sun gear and the ring gear, the sun gear, the ring gear and the planet gear carrier forming three principal elements of each planetary gear system, one of the principal elements of two of the planetary gear systems being fixed to one of the propellers, wherein there are three planetary gear systems, one of the principal elements of a first of said three planetary gear systems is fixed to the drive shaft, a second and a third of said three planetary gear systems comprise the principal elements fixed to the propellers, and one of the principal elements of each of the planetary gear systems is fixed to a fixed structure surrounding the drive shaft.
Dependencies are inferred from the claim text.