US 11,708,794 B2
Gearbox efficiency rating for turbomachine engines
Pietro Molesini, Turin (IT); Andrea Piazza, Turin (IT); and Fabio De Bellis, Turin (IT)
Assigned to GE Avio S.R.L., (IT)
Filed by GE Avio S.r.l., Turin (IT)
Filed on Oct. 14, 2022, as Appl. No. 18/46,612.
Application 18/046,612 is a continuation of application No. 17/364,707, filed on Jun. 30, 2021, granted, now 11,473,507.
Claims priority of application No. 102020000019189 (IT), filed on Aug. 4, 2020.
Prior Publication US 2023/0073996 A1, Mar. 9, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 7/36 (2006.01); F01D 17/16 (2006.01); F02C 7/06 (2006.01); F01D 25/18 (2006.01)
CPC F02C 7/36 (2013.01) [F01D 17/162 (2013.01); F02C 7/06 (2013.01); F05D 2200/13 (2013.01); F05D 2200/14 (2013.01); F05D 2200/22 (2013.01); F05D 2220/323 (2013.01); F05D 2260/40311 (2013.01); F05D 2260/98 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A turbomachine engine comprising:
a fan case;
a fan assembly disposed radially within the fan case and comprising a plurality of fan blades;
a core engine including a low-pressure turbine;
a vane assembly including a plurality of vanes, wherein the vanes are disposed aft of the fan blades and are coupled to the core engine and the fan case;
a gearbox coupled to the low-pressure turbine and the fan assembly, wherein the gearbox comprises a gear ratio within a range of 4.1-5.36; and
a gearbox efficiency rating of 0.21-0.33, wherein the gearbox efficiency rating equals

OG Complex Work Unit Math
wherein Q is a gearbox oil flow rate at an inlet of the gearbox measured in gallons per minute at a max takeoff condition, wherein D is a diameter of the fan blades measured in inches, and wherein T is a net thrust of the turbomachine engine measured in pounds force at the max takeoff condition.