Epicyclic gear train and turbine engine

DRIVE July 3, 2013
Source
An epicyclic gear train, 22, includes a carrier, 26, that supports star gears, 32, that mesh with a sun gear, 30. A ring gear, 38, surrounds and meshes with the star gears, 32. Each of the star gears is supported on a respective journal bearing, 34. Each journal bearing includes an internal central cavity, 34a, and at least one passage, 37, that extends radially from the internal cavity to a peripheral journal surface of the respective journal bearing. The epicyclic gear train, 22, has a gear reduction ratio of greater than or equal to about 2.3.

Discussion in the ATmosphere

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