Aircraft turbomachine with mechanical reduction gear

An aircraft turbomachine, comprising a mechanical reduction gear comprising:

• a sun gear which has a first axis of rotation centered on a main axis of the turbomachine,
• a ring gear that extends around the sun gear and said first axis,
• planet gears which are meshed with the sun gear and the ring gear, each planet gear having a second axis of rotation parallel to said first axis and comprising a first toothing meshing with the sun gear, and a second toothing meshing with the ring gear, the first toothing of each planet gear comprising two series of teeth which are at an axial distance from one another and which are disposed on either side of a median plane of the planet gear which is perpendicular to the second axis of this planet gear, the second toothing of each planet gear being arranged between the two series of teeth of the first toothing and comprising two series of teeth which are at an axial distance from each other and which are arranged on either side of said median plane of the planet gear, the first toothing of each planet gear having a diameter greater than that of the second toothing of the planet gear,
• a planet carrier which has an axis of rotation coincident with said first axis and which comprises an internal cavity for housing the sun gear, the planet carrier carrying bearings for guiding the planet gears in rotation around their second axes,
• wherein:
• the sun gear is coupled to a first rotor shaft of the turbomachine,
• the planet carrier is coupled to a second rotor shaft of the turbomachine, and
• the ring gear is fixed to a stator of the turbomachine,
• and in that each planet gear is preferably guided in rotation by two guide bearings which are respectively located in line with said two series of teeth of the first toothing of this planet gear,
• and wherein each of the planet gears is formed by the assembly of at least three parts including:
• a tubular part centered on the second axis, this tubular part comprising a median portion comprising the two series of teeth of the second toothing, and
• two annular webs which are centered on the second axis and extend to the two opposite axial ends of the first part, these annular webs respectively comprising at their external peripheries the two series of teeth of the first toothing.