CPC F02C 7/36 (2013.01) [F05D 2220/323 (2013.01); F05D 2220/324 (2013.01); F05D 2220/325 (2013.01); F05D 2240/54 (2013.01); F05D 2260/40311 (2013.01)] | 15 Claims |
1. A propulsion system comprising:
a drive shaft movable in rotation about an axis of rotation;
a fan;
a fan shaft configured to drive the fan in rotation about the axis of rotation;
a reduction mechanism coupling the drive shaft and the fan shaft, wherein the reduction mechanism has a first reduction stage and a second reduction stage and includes:
a sun gear, centered on the axis of rotation and configured to be driven in rotation by the drive shaft,
a ring gear, coaxial with the sun gear and configured to drive in rotation the fan shaft about the axis of rotation, and
planet gears distributed circumferentially about the axis of rotation between the sun gear and the ring gear, each planet gear comprising a first portion forming the first reduction stage which is meshed with the sun gear and a second portion forming the second reduction stage which is meshed with the ring gear, a diameter of the first portion being different from a diameter of the second portion, the first portion of the planet gears extending between the second portion of the planet gears and the fan.
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