Device for driving at least one wheel of an aircraft landing gear

An aircraft landing gear, comprising:

• at least one landing gear wheel, said wheel comprising a rim having an axis of rotation,
• an electric motor comprising a shaft,
• a mechanical transmission system between the shaft of the motor and the rim, said mechanical transmission system comprising a mechanical reducer,
• wherein the mechanical reducer comprises:
• a sun gear secured in rotation to the shaft of the motor, said sun gear being centered on the axis and comprising an external toothing,
• a ring gear centered on the axis and comprising two internal toothings, and
• planet gears which are carried by a planet carrier and which each have a median plane of symmetry perpendicular to the axis, each of the planet gears comprising three external toothings, including a median external toothing which is meshed with the toothing of the sun gear, and two lateral external toothings which are respectively arranged on either side of the median external toothing and which are respectively meshed with the toothings of the ring gear, and
• wherein the planet gears are each centered and guided by three needle bearings carried by the planet carrier, said three needle bearings including a median needle bearing that is radially in line with said median external toothing, and said three needle bearings further including two lateral needle bearings that are respectively radially in line with said lateral external toothings.