Abstract: An apparatus comprising a shaft for a gas turbine engine, the shaft comprising a shaft flange; a turbine rotor for the gas turbine engine, the turbine rotor comprising a turbine rotor flange configured to couple to the shaft flange; and a stub shaft comprising a stub shaft flange configured to couple to the shaft flange. The stub shaft is concentric with the shaft and configured to have a first interference fit around a portion of the turbine rotor.

Abstract: A shaft has an axis, an outer surface, an inner surface and is arranged to rotate in a first circumferential direction. The shaft comprises a first set of equally circumferentially spaced apertures extending through the shaft between the outer and inner surfaces of the shaft. A second set of equally circumferentially spaced apertures extends through the shaft between the outer and inner surfaces of the shaft. The first and second sets of apertures are arranged in first and second planes arranged perpendicularly to the axis of the shaft. The second plane is spaced axially downstream from the first plane. Each aperture in the second set of apertures is circumferentially displaced in a second circumferential direction from a circumferential mid position between the two apertures in the first set of apertures to reduce the stresses in the shaft.

Abstract: A shaft (21) for use as a rotating shaft in a gas turbine engine has an axis (X), an outer surface, an inner surface (28), an upstream end and a downstream end. The shaft (21) is arranged, in use, to rotate in a circumferential direction (R) about the axis (X). The inner surface (28) includes a radially inwardly protruding flange (22), a circumferential array of radially extending apertures (26) provided in the flange (22) and an array of channels (24) extending from an upstream side to a downstream side of the flange (22). The channels arranged circumferentially between adjacent apertures (26) of the circumferential array of apertures (26).

Abstract: A shaft has an axis, an outer surface, an inner surface and is arranged to rotate in a first circumferential direction. The shaft comprises a first set of equally circumferentially spaced apertures extending through the shaft between the outer and inner surfaces of the shaft. A second set of equally circumferentially spaced apertures extends through the shaft between the outer and inner surfaces of the shaft. The first and second sets of apertures are arranged in first and second planes arranged perpendicularly to the axis of the shaft. The second plane is spaced axially downstream from the first plane. Each aperture in the second set of apertures is circumferentially displaced in a second circumferential direction from a circumferential mid position between the two apertures in the first set of apertures to reduce the stresses in the shaft.