US 12,435,673 B2
Aircraft engine
Matthew Silvester, Derby (GB); and Geoffrey Hughes, Bristol (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE PLC, London (GB)
Filed on Jan. 24, 2025, as Appl. No. 19/036,330.
Application 19/036,330 is a division of application No. 17/738,198, filed on May 6, 2022, abandoned.
Application 17/738,198 is a continuation of application No. 17/331,020, filed on May 26, 2021, granted, now 11,359,549, issued on Jun. 14, 2022.
Claims priority of application No. 2008334 (GB), filed on Jun. 3, 2020.
Prior Publication US 2025/0163854 A1, May 22, 2025
Int. Cl. F02C 7/36 (2006.01); B64D 27/10 (2006.01); F02C 3/073 (2006.01); F02K 3/06 (2006.01); F04D 25/02 (2006.01); F04D 29/40 (2006.01)
CPC F02C 7/36 (2013.01) [B64D 27/10 (2013.01); F02C 3/073 (2013.01); F02K 3/06 (2013.01); F04D 25/02 (2013.01); F04D 29/40 (2013.01); F05D 2220/323 (2013.01); F05D 2220/36 (2013.01); F05D 2260/4031 (2013.01); F05D 2260/96 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gas turbine engine for an aircraft, the engine comprising:
an engine core comprising a turbine, a compressor, and a core shaft connecting the turbine to the compressor; and
a fan system comprising:
a fan located upstream of the engine core and comprising a plurality of fan blades rotating about a longitudinal engine axis, the fan having a fan diameter in a range from 215 cm to 420 cm, a mass in a range from 300 kg to 1000 kg, and a moment of inertia about the longitudinal engine axis in a range from 100 kg·m2 to 600 kg·m2;
a fan shaft supported by a forward bearing and a rearward bearing and having a fan shaft length, L, between the forward bearing and the rearward bearing in a range of from 900 mm to 1800 mm and a tilt stiffness in a range from 5×109 N·mm/rad to 12×109 N·mm/rad;
a gearbox and a gearbox output shaft arranged to couple an output of the gearbox to the fan shaft, the gearbox receiving input from the core shaft and outputting drive to the fan via the gearbox output shaft so as to drive the fan at a lower rotational speed than the core shaft, and
a front mount.