US 12,066,095 B2
Mechanical reducer for an aircraft turbomachine
Balint Pap, Moissy-Cramayel (FR); Clement Jarroux, Moissy-Cramayel (FR); Pierre Gilbert Claude Medecin, Moissy-Cramayel (FR); and Guillaume Pierre Mouly, Moissy-Cramayel (FR)
Assigned to SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
Filed by SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
Filed on Mar. 3, 2023, as Appl. No. 18/177,988.
Claims priority of application No. 2202118 (FR), filed on Mar. 10, 2022.
Prior Publication US 2024/0151303 A1, May 9, 2024
Int. Cl. F16H 57/04 (2010.01); F16H 57/08 (2006.01)
CPC F16H 57/0479 (2013.01) [F16H 57/043 (2013.01); F16H 57/0471 (2013.01); F16H 57/0482 (2013.01); F16H 2057/085 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A mechanical reducer for a turbomachine, said mechanical reducer comprising:
a sun gear having a first axis of rotation,
a ring gear extending 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 and comprising a first toothing having a first average diameter for meshing with the sun gear, and a second toothing having a second average diameter for meshing with the ring gear, the first and second average diameters being different,
hydrodynamic bearings for guiding the planet gears in rotation, these hydrodynamic bearings being carried by a planet carrier and comprising cylindrical bodies which have a generally elongated shape along said second axis and which are engaged in the planet gears, each of these cylindrical bodies comprising an internal oil circulation cavity and first pipelines for conveying oil from this cavity to at least one external cylindrical surface of the body extending around said second axis, so as to form at least one oil film for guiding the planet gear mounted on this body,
wherein each of the cylindrical bodies further comprises second oil evacuation pipelines, which are different from the first pipelines, and which extend from said at least one external cylindrical surface to at least one of the longitudinal ends of that body.