Patent ID: 7563079

Claim:
An assembly for a turbocharger comprising: a labyrinth seal formed by a plurality of slots of a rotatable shaft and a plurality of seal rings, each seal ring received by a respective one of the plurality of slots, the shaft and seal rings positioned in a bore wherein the bore comprises a longitudinal axis extending generally from an inner end to an outer end of the bore and a seat defined inwardly by a step and outwardly by a chamfer that extends radially inward over an outward axial distance to an outer plateau radius of an outer plateau proximate the outer end of the bore where the step resists inward movement of the shaft in the bore and where the chamfer resists outward movement of the shaft in the bore while allowing for removal of the shaft and the plurality of seal rings from the bore via radial contraction of at least one of the seal rings to the radius of the outer plateau as the at least one ring traverses axially across the chamfer.