US 12,104,495 B2
Drive assembly for a mechanical reducer for an aircraft turbomachine
Bálint Pap, Moissy-Cramayel (FR); Clément Jarroux, Moissy-Cramayel (FR); Guillaume Pierre Mouly, Moissy-Cramayel (FR); and Pierre-Damien Tune, Moissy-Cramayel (FR)
Assigned to SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
Filed by SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
Filed on Sep. 12, 2023, as Appl. No. 18/465,336.
Claims priority of application No. 2209132 (FR), filed on Sep. 12, 2022.
Prior Publication US 2024/0084712 A1, Mar. 14, 2024
Int. Cl. F01D 15/12 (2006.01)
CPC F01D 15/12 (2013.01) [F05D 2240/50 (2013.01); F05D 2260/40311 (2013.01); F05D 2260/98 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A drive assembly for a mechanical reducer for a turbomachine, the drive assembly comprising:
planet gears distributed around a first axis, each of the planet gears having a corresponding second axis of rotation parallel to the first axis, each of the planet gears comprising at least one external meshing toothing,
a planet carrier comprising at least one transverse wall perpendicular to the first axis,
plain bearings configured to guide each of the planet gears in rotation about the corresponding second axis, the plain bearings being carried by the planet carrier, and
an oil supply circuit for the plain bearings,
wherein:
the planet carrier comprises collars configured to attach the planet gears to said at least one transverse wall, each of the collars extending around a planet gear and the corresponding second axis and comprising at least one internal cylindrical surface portion,
each of the planet gears comprises at least one external cylindrical surface for forming an oil film with said at least one internal cylindrical surface portion,
said oil supply circuit opens onto said at least one internal cylindrical surface portion of each of the collars for the formation of said oil film, and
each of the planet gears is attached by a median attachment collar, which is located in a median plane perpendicular to the first axis and passing through the middles of the planet gears.