Patent ID: 7752836
Filing Date: 2010-07-13
Classification: F02C,F02K,F05D,Y02T

Abstract:
1. A method for assembling a gas turbine engine, said method comprising: coupling a gearbox to a single rotation low-pressure turbine, the gearbox including a plurality of planetary gears intermeshed with a sun gear, wherein each of the planetary gears includes a first gear portion having a first diameter and a second gear portion axially displaced from the first gear portion and having a second diameter different than the first diameter; coupling a first fan assembly directly to the single rotation low-pressure turbine so that the first fan assembly is not driven by the gearbox; coupling a second fan assembly to the first gear portion; and coupling the sun gear to one of the first gear portion and the second gear portion; and coupling a booster compressor to the second gear portion such that the single rotation low-pressure turbine is configured to drive the first fan assembly, the second fan assembly, and the booster compressor and such that the first fan assembly is rotatable in a first rotational direction and the second fan assembly is rotatable in a second rotational direction that is different than the first rotational direction.