US 12,435,672 B2
Flexibilities in a gas turbine engine with speed reducer
Julien Fabien Patrick Becoulet, Moissy-Cramayel (FR); Maxime Paul Numa Givert, Moissy-Cramayel (FR); and Alexandre Jean-Marie Tan-Kim, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 18/690,549
Filed by Safran Aircraft Engines, Paris (FR)
PCT Filed Sep. 7, 2022, PCT No. PCT/FR2022/051689
§ 371(c)(1), (2) Date Mar. 8, 2024,
PCT Pub. No. WO2023/037074, PCT Pub. Date Mar. 16, 2023.
Claims priority of application No. FR2109526 (FR), filed on Sep. 10, 2021.
Prior Publication US 2025/0137407 A1, May 1, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 7/36 (2006.01)
CPC F02C 7/36 (2013.01) [F05D 2220/323 (2013.01); F05D 2240/54 (2013.01); F05D 2260/40311 (2013.01); F05D 2260/941 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An assembly comprising:
a casing;
a fan shaft movable in rotation relative to the casing about a longitudinal axis;
a first bearing configured to support in rotation the fan shaft and fixedly mounted on the casing;
a turbine shaft movable in rotation relative to the casing about the longitudinal axis;
a second bearing configured to support in rotation the turbine shaft and fixedly mounted on the casing;
a mechanical transmission device, the turbine shaft driving the fan shaft via the mechanical transmission device;
a first connection element having a first end connected to the fan shaft and mounted on the first bearing, a second end connected to the mechanical transmission device, and a first radial flexibility;
a second connection element having a third end connected to the turbine shaft and mounted on the second bearing, a fourth end connected to the mechanical transmission device, and a second radial flexibility; and
a third connection element having a fifth end fixedly mounted on the casing, a sixth end connected to the mechanical transmission device, and a third radial flexibility;
wherein a ratio between the first radial flexibility and the third radial flexibility is strictly less than 10% and/or a ratio between the first radial flexibility and the second radial flexibility is strictly less than 4%.