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Torque frame and asymmetric journal bearing for fan drive gear system

  • US 8,899,916 B2
  • Filed: 08/30/2011
  • Issued: 12/02/2014
  • Est. Priority Date: 08/30/2011
  • Status: Active Grant
First Claim
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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.

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