Rotor assembly

摘要

A rotor assembly for a gas turbine engine, with an annular sleeve having an inner member connected around the shaft to rotate together therewith and having an outer member with a first end connected to the inner member, the outer member defining an annular continuous frustoconical inner surface angled such as to extend closer to the central axis near the first end. A rotor disc includes an annular protuberance extending radially inwardly of the outer member and forced toward the first end, and having an annular continuous frustoconical outer surface complementary to the inner surface of the outer member and in torque-transmitting engagement therewith. The assembly includes means for axially pressing the sleeve and the disc against one another to maintain the complementary frustoconical surfaces in torque-transmitting engagement. A method of engaging a rotor disc to a driving shaft in a gas turbine engine is also provided.

主权项

1. A rotor assembly for a gas turbine engine, the assembly comprising:
a rotatable shaft for driving engagement with a turbine rotor of the engine; an annular sleeve having concentric inner and outer members interconnected by a radially extending end wall, the inner member connected around the shaft to rotate together therewith, the outer member being located radially outwardly of and spaced apart from the inner member, the outer member defining an annular continuous frustoconical inner surface angled such as to extend closer to a central axis of the rotor assembly near the end wall than away therefrom; a rotor having an annular disc including an outer perimeter portion having a plurality of blades extending radially outwardly therefrom, the disc having a central opening defined therethrough through which the shaft extends with an annular gap being defined between the shaft and the disc, the disc having an annular recess defined therein separating the outer perimeter portion from an annular protuberance extending substantially axially, the central opening being surrounded by the annular protuberance; wherein the outer member of the sleeve is received in the recess of the disc with the protuberance being located radially inwardly of the outer member, the protuberance being spaced apart from the end wall and the inner member of the sleeve, the protuberance defining a continuous frustoconical outer surface complementary to the frustoconical inner surface of the outer member and in torque-transmitting engagement therewith; and a locking member engaged to the shaft and axially pressing one of the sleeve and the disc against the other of the sleeve and the disc with the other of the sleeve and the disc abutting a shoulder having a fixed axial position relative to the shaft, the locking member producing an axial force maintaining the protuberance pressed toward the first end of the outer member and maintaining the torque-transmitting engagement between the complementary frustoconical outer and inner surfaces.