Gas turbine engine gear train

A turbine engine comprising:

• a turbine shaft;
• a fan;
• and
• an epicyclic gear train coupled between the turbine shaft and the fan, the epicyclic gear train including a carrier supporting star gears that mesh with a sun gear, and a ring gear surrounding and meshing with the star gears, each of the star gears being supported on a respective journal bearing, each journal bearing including a peripheral journal surface and each of the star gears including a radially inner journal surface in contact with the peripheral journal surface of the respective journal bearing.

A turbine engine comprising:

• an input shaft;
• a fan mounted on a fan shaft;
• and
• an epicyclic gear train coupled between the input shaft and the fan shaft, the epicyclic gear train including a carrier, intermediate gears, a sun gear, a ring gear, and journal bearings, the carrier supporting the intermediate gears on the journal bearings, the intermediate gears meshing with the sun gear and the ring gear surrounding and meshing with the intermediate gears, the ring gear including,
• first and second portions that abut at a radial interface, the first and second portions having respective flanges that abut at a radial interface,
• a first thickness and a second thickness that is located axially inwardly from the first thickness, the first thickness being less than the second thickness, and
• the flanges extending radially outwards from a location at the second thickness.