Patent ID: 11898490
Assignee: RTX CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A gas turbine engine comprising:
a first spool comprising a first compressor and a first turbine mounted to a first shaft;
a second spool comprising a second compressor and a second turbine mounted to a second shaft;
a third spool comprising a third compressor and a third turbine mounted to a third shaft;
a plurality of engine accessories;
an accessory gearbox comprising;
a housing;
a sun gear rotationally coupled to the third shaft;
a ring gear rotationally coupled to the plurality of engine accessories;
a plurality of planet gears enmeshed with the sun gear and the ring gear and supported from a carrier, wherein the carrier is rotationally coupled to the second shaft; and
a locking member translatable from a disengaged position to an engaged position, wherein the carrier is rotationally coupled to the sun gear or the ring gear in the engaged position to thereby prevent rotation of the carrier with respect to the sun gear or the ring gear;

wherein a second maximum speed is a maximum continuous rotational speed of the second spool, and wherein a third maximum speed is a maximum continuous rotational speed of the third spool, and wherein a gear ratio between the second spool and the third spool is constant and rotates the second spool at the second maximum speed when a third rotational speed of the third spool is equal to or less than 90% of the third maximum speed and greater than or equal to 80% of the third maximum speed.