DRIVE ASSEMBLY FOR A MECHANICAL REDUCTION GEAR OF AN AIRCRAFT TURBINE ENGINE

Drive assembly (100) for a mechanical reducer (6) of a turbomachine (1), in particular of an aircraft, this assembly (100) comprising: - planet gears (108), - a planet carrier (110) which comprises at least one transverse wall (114, 144), - plain bearings for guiding the rotation of the planet gears (108), and - an oil supply circuit for the plain bearings, characterized in that the planet carrier (110) comprises collars (116, 146) for fastening the planet gears (108) to said at least one transverse wall (114, 144), in that each of the planet gears (108) comprises at least one external cylindrical surface (126a, 126b, 126c) for forming an oil film with a portion of internal cylindrical surface (132) of each of the collars (116, 146) for the formation of said oil film.