Patent ID: 8757980

Claim:
A rotor for a gas turbine engine comprising: a one-piece rotor spool extending along an axis of the engine, the spool comprising a cylindrical radially inner portion and a cylindrical radially outer portion that are radially offset from each other; and a cylindrical rotor ring which is independent from the spool such that the ring is separable from and mountable on the spool, wherein the radially outer portion includes a plurality of housings for rotor blades formed in an outer surface of the radially outer portion, wherein the rotor ring includes a plurality of housings of rotor blades formed in an outer surface of the ring, and wherein an outer circumferential surface of the radially inner portion of the spool includes an attachment mechanism which cooperates with an attachment device of the rotor ring, which is formed in an inner circumferential surface of the ring in order to prevent a tangential movement of the rotor ring relative to the rotor spool, an outer diameter of the outer circumferential surface of the radially inner portion being substantially equal to an inner diameter of the inner circumferential surface of the ring.