DRIVE DESIGN FOR GAS TURBINE ENGINE (VARIANTS) Russian patent published in 2017 - IPC F01D25/16 F02C7/36 F02C7/20 

FIELD: engines and pumps.

SUBSTANCE: drive design for a gas turbine engine comprises: a fan shaft; a frame, supporting the fan shaft; a gear system that drives the fan shaft; a flexible bearing structure that at least partially supports the gear system, and an inlet assembly of the gear system. Bending stiffness (KFS^BEND) of the flexible bearing structure with respect to the longitudinal axis of the engine and the bending stiffness (KIC^BEND) of the inlet assembly relative to said rotation axis is less than 20% of the bending stiffness (Kframe^BEND) of the frame relative to said axis. Bending stiffness (KICBEND) of the inlet assembly relative to the longitudinal axis of the engine is less than 5% of the bending stiffness (KGM^BEND) of the gearing zone between the sun gear and the planetary gears of the gear system with respect to said axis. Bending stiffness (KFS^BEND) of the flexible bearing structure relative to this axis is less than 8% of the bending stiffness (KGM^BEND) of said gearing zone relative to said axis.

EFFECT: preventing loss of efficiency and reducing the service life of the drive design and the gas turbine engine as a whole, possible misalignment of the plain bearings in the gear drive and in engagement with gears.

19 cl, 6 dwg