US 12,065,975 B2
High-power epicyclic gearbox and operation thereof
Mark Spruce, Derby (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Apr. 3, 2023, as Appl. No. 18/130,225.
Application 18/130,225 is a continuation of application No. 17/966,318, filed on Oct. 14, 2022, granted, now 11,643,976.
Application 17/966,318 is a continuation of application No. 17/404,420, filed on Aug. 17, 2021, granted, now 11,512,648, issued on Nov. 29, 2022.
Application 17/404,420 is a continuation of application No. 17/119,379, filed on Dec. 11, 2020, granted, now 11,143,112, issued on Oct. 12, 2021.
Application 17/119,379 is a continuation of application No. 17/029,539, filed on Sep. 23, 2020, granted, now 10,914,241, issued on Feb. 9, 2021.
Application 17/029,539 is a continuation of application No. 16/807,956, filed on Mar. 3, 2020, granted, now 10,808,626, issued on Oct. 20, 2020.
Claims priority of application No. 1917777 (GB), filed on Dec. 5, 2019.
Prior Publication US 2024/0011442 A1, Jan. 11, 2024
Int. Cl. F02C 7/36 (2006.01); F16H 57/02 (2012.01); F16H 57/08 (2006.01)
CPC F02C 7/36 (2013.01) [F16H 57/082 (2013.01); F05D 2200/14 (2013.01); F05D 2220/323 (2013.01); F05D 2260/40311 (2013.01); F05D 2300/501 (2013.01); F16H 2057/02043 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gas turbine engine for an aircraft comprising:
an engine core comprising a turbine, a compressor, and a core shaft connecting the turbine to the compressor;
a fan located upstream of the engine core, the fan comprising a plurality of fan blades; and
a gearbox arranged to receive an input from a gearbox input shaft portion of the core shaft and to output drive to the fan so as to drive the fan at a lower rotational speed than the core shaft, wherein:
a geared engine performance parameter is defined as:

OG Complex Work Unit Math
the fan tip loading being defined as dH/Uttip2, where dH is an enthalpy rise across the fan and Uttip is the velocity of the fan tip, and
the geared engine performance parameter is in a range of 4200 to 16000.