US 11,988,136 B2
Turbomachine having a contrarotating turbine for an aircraft
Paul Ghislain Albert Levisse, Moissy-Cramayel (FR); Olivier Belmonte, Moissy-Cramayel (FR); Romain Truco, Moissy-Cramayel (FR); Olivier Formica, Moissy-Cramayel (FR); Fabrice Joel Luc Chevillot, Moissy-Cramayel (FR); and Clement Paul Rene Niepceron, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR); and SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
Appl. No. 17/756,501
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR); and SAFRAN TRANSMISSION SYSTEMS, Colombes (FR)
PCT Filed Dec. 8, 2020, PCT No. PCT/FR2020/052348
§ 371(c)(1), (2) Date May 26, 2022,
PCT Pub. No. WO2021/116600, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 1914022 (FR), filed on Dec. 10, 2019.
Prior Publication US 2023/0011485 A1, Jan. 12, 2023
Int. Cl. F02C 3/067 (2006.01); F02C 7/06 (2006.01); F02C 7/36 (2006.01); F02K 3/06 (2006.01)
CPC F02C 3/067 (2013.01) [F02C 7/06 (2013.01); F02C 7/36 (2013.01); F02K 3/06 (2013.01); F05D 2220/323 (2013.01); F05D 2240/54 (2013.01); F05D 2260/40311 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A turbomachine having a contrarotating turbine for an aircraft,
the turbomachine comprising a contrarotating turbine of which a first rotor is configured to rotate in a first direction of rotation and is connected to a first turbine shaft, and a second rotor configured to rotate in an opposite direction of rotation and connected to a second turbine shaft, the first rotor comprising turbine wheels interleaved between turbine wheels of the second rotor, the turbomachine further comprising a first stator casing located upstream of the contrarotating turbine with respect to a direction of flow of gas in the turbomachine
the turbomachine further comprising a second stator casing located downstream of the contrarotating turbine with respect to said direction,
the turbomachine further comprising a planetary-type epicyclic mechanical reduction gear which comprises a sun gear driven in rotation by said second turbine shaft, a ring gear driven in rotation by said first turbine shaft, and a planet carrier attached to said a first stator casing,
the turbomachine comprising bearings for guiding the first and second turbine shafts,
wherein said first turbine shaft is guided by at least two of said guide bearings carried by said second stator casing, said at least two guide bearings being located downstream of the contrarotating turbine, a first of at least two guide bearings being located radially outward of the reduction gear and the second of at least two guide bearings located radially inward of the reduction gear and said second turbine shaft is guided by at least two guide bearings mounted between said second shaft and said first stator casing or an element connected to the latter.