Patent ID: 8052397

Claim:
A rotor and shaft assembly for turbomachinery comprising: a shaft, said shaft comprising: a shaft stop; a non-tapered, uniform diameter rotor hub section; a non-tapered, polygon shaped drive collar section; and an outboard shaft end configured for rotationally receiving a threaded shaft end assembly for securing a rotor hub on the shaft; a rotor hub comprising a hub bore of uniform diameter and a radially centered, non-tapered, polygon shaped drive collar recess configured in one face of the rotor hub; and a drive collar with a polygon shaped, non-tapered outer edge and a coaxial, polygon shaped, non-tapered central opening; the polygon shaped outside edge sized for axially sliding, non-rotational engagement with the polygon shaped drive collar recess of the rotor hub, the polygon shaped central opening sized for axially sliding, non-rotational engagement with the polygon drive collar section of the drive shaft; the polygon drive collar being axially and non-rotationally engaged in the polygon recess of the rotor hub, the rotor hub and drive collar being axially and non-rotationally fitted onto the respective rotor hub and drive collar sections of the shaft and being secured thereto by the shaft stop and the threaded shaft end assembly.