Aeronautical propulsion system

An aeronautical propulsion system comprising:

• a drive shaft;
• a fan rotor;
• a fan shaft that rotationally drives the fan rotor;
• a speed reducer that rotationally couples the drive shaft and the fan shaft, and that is configured to drive the fan shaft at a rotation speed less than a rotation speed of the drive shaft, the speed reducer comprising:
• a sun gear rotationally coupled with the drive shaft,
• a satellite that meshes with the sun gear,
• a ring gear which meshes with the satellite, the ring gear having a diameter greater than a diameter of the sun gear,
• a planet-carrier on which the satellite is rotationally mounted, the planet-carrier being fixed with respect to a stator of the aeronautical propulsion system;
• and
• a lubrication device comprising:
• a pump comprising a pump rotor, the pump being configured to supply oil to the speed reducer when the pump rotor is in rotation, the pump rotor being rotationally coupled with the satellite, wherein, considered in an axial direction along which the aeronautical extends, the speed reducer is located between the pump and the drive shaft, and
• an intake duct that supplies oil to the pump, wherein the intake duct axially traverses the speed reducer.