Torque frame and asymmetric journal bearing for fan drive gear system

摘要

A fan drive gear system for a gas turbine engine includes a torque frame and a journal bearing. The torque frame has an arm that extends therefrom, the journal bearing is mounted on the arm. When the fan drive gear system is in an unloaded condition an outer circumferential surface of the journal bearing is disposed at an angle so that it is non-parallel with respect to an axis of the arm. When the fan drive gear system is in a loaded condition the outer circumferential surface is disposed substantially parallel to the axis of the arm. In another aspect, the journal bearing includes a main body, a first wing, and a second wing. The first and second wings extend from the main body and are asymmetric with respect to one another.

主权项

1. A fan drive gear system for a gas turbine engine, comprising:
a torque frame having an arm extending therefrom, the arm providing an axis; a journal bearing mounted on the arm and having an outer circumferential surface; a planet gear supported on the journal bearing for rotation about a rotational axis which substantially aligns with and is parallel to the axis of the arm; a sun gear located radially inward from and intermeshing with planet gear, the sun gear coupled to a low pressure shaft of the gas turbine engine; and a ring gear arranged about and intermeshing with the planet gear, the ring gear coupled to a fan shaft of the gas turbine engine; wherein when the fan drive gear system is in an unloaded condition the outer circumferential surface of the journal bearing is disposed at an angle that is non-parallel with respect to the axis of the arm, and wherein when the fan drive gear system is in a loaded condition the outer circumferential surface of the journal bearing is disposed substantially parallel with respect to the axis of the arm.