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Mechanism for turbine engine start from low spool

  • US 9,200,592 B2
  • Filed: 06/28/2011
  • Issued: 12/01/2015
  • Est. Priority Date: 06/28/2011
  • Status: Active Grant
First Claim
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1. A gas turbine engine, comprising:

  • a high spool mechanically connected to a high spool bull gear;

    a low spool mechanically connected to a fan and a low spool bull gear;

    a gear system actuable to engage and disengage the low spool bull gear to and from the high spool bull gear with a bevel gear;

    an actuator connected to the bevel gear for selectively engaging and disengaging the gear system; and

    a motor/generator connected to the low spool, wherein the motor/generator is configured to control the rotational speed of the low spool bull gear to a point where the rotational speed of the low spool bull gear substantially matches the rotational speed of the high spool bull gear, wherein the actuator is controlled to engage the low spool bull gear and high spool bull gear by the bevel gear when the low spool bull gear and the high spool bull gear have the same rotational speed to allow rotation of the high spool to be driven by the motor/generator through the low spool.

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