Epicyclic gear train

A gas turbine engine comprising:

• a turbo fan shaft;
• at least one bearing mounted on the turbo fan shaft, the turbo fan shaft including at least one shaft passage adjacent the at least one bearing and extending in a direction having at least a radial component;
• a turbo fan supported on the turbo fan shaft, the turbo fan mounted for rotation on the at least one bearing, the turbo fan including a fan blade and a pressure ratio of less than 1.45 across the fan blade alone, and the gas turbine engine having a bypass ratio of greater than 10 with regard to a bypass airflow and a core airflow, and a low corrected fan tip speed of less than 1150 ft/second;
• an epicyclic gear train coupled to drive the turbo fan, the epicyclic gear train including a carrier supporting intermediate gears that mesh with a sun gear, and a ring gear surrounding and meshing with the intermediate gears, wherein:
• the ring gear is a two-piece construction have first and second portions that abut one another at a radial interface, and the first and second portions have grooves at the radial interface that form a hole that expels oil in operation through the ring gear to a gutter;
• each of the intermediate gears is supported on a respective journal bearing;
• each journal bearing includes an internal central cavity that extends between axial ends, and includes at least one journal passage that extends from the internal central cavity to a peripheral journal surface of the journal bearing;
• and
• the epicyclic gear train defines a gear reduction ratio of greater than 2.3;
• and
• a turbine section coupled to drive the turbo fan through the epicyclic gear train, the turbine section having a fan drive turbine that includes a pressure ratio that is greater than 5.