US 12,345,320 B2
Reduction gearbox for gas turbine engine with lubrication control system
Michel Desjardins, St-Hubert (CA); and Herve Turcotte, Ste-Julie (CA)
Assigned to Pratt & Whitney Canada Corp., Longueuil (CA)
Filed by Pratt & Whitney Canada Corp., Longueuil (CA)
Filed on May 5, 2023, as Appl. No. 18/144,006.
Prior Publication US 2024/0369134 A1, Nov. 7, 2024
Int. Cl. F16H 57/04 (2010.01); F02C 7/06 (2006.01)
CPC F16H 57/0423 (2013.01) [F02C 7/06 (2013.01); F16H 57/0479 (2013.01); F16H 57/0482 (2013.01); F05D 2260/98 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A reduction gearbox, comprising:
a casing;
a planetary gear arrangement disposed in the casing, the planetary gear arrangement having:
a sun gear;
a plurality of planet gear assemblies, each planet gear assembly having a main gear meshed with the sun gear, a fore lateral gear and an aft lateral gear disposed on opposite sides of the main gear and rotating therewith, the main gear having a main gear pitch diameter and the fore and aft lateral gears having a lateral gear pitch diameter; and
a fore ring gear meshed with the fore lateral gears; and
an aft ring gear meshed with the aft lateral gears, wherein the aft ring gear is independent of the fore ring gear; and
wherein the plurality of planet gear assemblies are in communication with an output; and
a lubrication handling system that includes a first set of baffles including a fore ring gear baffle disposed on a fore side of the planetary gear arrangement proximate the fore ring gear, and an aft ring gear baffle disposed on an aft side of the planetary gear arrangement proximate the aft ring gear;
wherein the lubrication handling system further includes a second set of baffles including a fore main gear baffle (FMGB) disposed on a fore side of the main gears of the planet gear assemblies, and an aft main gear baffle (AMGB) disposed on an aft side of the main gears of the planet gear assemblies.