Gas Turbine engine
DRIVE
July 3, 2013
A turbine engine (10) includes a fan shaft (20) and at least one tapered bearing, (80), mounted on the fan shaft. The fan shaft includes at least one radially extending passage, (82), adjacent the at least one tapered bearing, (80). A fan, (18), is mounted for rotation on the tapered bearing. An epicyclic gear train, (22), is coupled to drive the fan. The epicyclic gear train, (22), includes a carrier, (26), that supports star gears, (32), that mesh with a sun gear, (30), and a ring gear, (38), that surrounds and meshes with the star gears, (32), Each of the star gears is supported on a respective journal bearing. The epicyclic gear train defines a gear reduction ratio of greater than or equal to about 2.3.
Discussion in the ATmosphere