Patent ID: 8475116

Claim:
A turbine balance assembly comprising: a turbine rotor connected to drive a turbine shaft; bearings positioned radially outwardly of said turbine shaft; a bearing sleeve positioned radially outwardly of said bearings, and supporting said bearings, said bearing sleeve extending along an axial length defined by a rotational axis of said shaft, and said bearing sleeve having a turbine rotor end adjacent to said turbine rotor, and a remote end; a radially outwardly extending flange on said bearing sleeve extending radially outwardly of a support portion of said bearing sleeve and at said turbine rotor end, and said flange having a nominal outer radius, and including a slot for receiving an anti-rotation tab over a limited circumferential extent; a ratio between a distance from a center line of said bearing sleeve to a tangent point for a flat surface on a radially inner end of said slot relative to said nominal radius of the flange is between 0.92 and 0.95; and said slot extends for a distance along said flat surface between two sides, and a ratio of the distance between said two sides to said nominal radius is between 0.09 and 0.22.