POWER TURBINE Russian patent published in 2018 - IPC F01D25/16 F02C7/06 F01D11/02 

FIELD: engine building.

SUBSTANCE: invention relates to gas turbine engines with a power free turbine. Power turbine comprises a stator with located therein roller bearing and mounted in roller bearing the turbine rotor shaft with turbine disks. Power turbine roller bearing inner ring is mounted on the intermediate bushing, located on the power turbine shaft and fixed axially from the rear by the gas flow side with the shaft mounted nut through the bushing mounted spring ring. Nut is made with the annular, axial rib, directed to the roller bearing, located on the outside from the spring ring. Between the intermediate bushing and the shaft annular slotted cavity is made. On the intermediate bushing of the gas upstream side a labyrinth ring with the labyrinth radial annular combs is installed, as well as adjustment ring located between the labyrinth ring and the roller bearing inner ring. To the adjustment ring outer surface stator flange annular radial rib is facing, with the intermediate annular cavity formation between the labyrinth ring rib and comb, at the outlet connected to the support oil cavity by radial channels.

EFFECT: invention allows to increase the power turbine reliability by reducing the stresses created by the power turbine shaft in the roller bearing inner ring, and also by the eliminating of oil ingress into the turbine air cavities and into the gas path at the turbine reduced operating conditions.

1 cl, 3 dwg