Turbocharger integrated bearing system

An integrated bearing system for a turbocharger comprising:

• a center housing including a bearing case bore and a boss with an aperture receiving a locating pin extending into the bearing case bore substantially centrally in the bore;
• a single piece bearing received in the the bearing case bore and having integral thrust surfaces on opposing ends and integral journal bearing surfaces on portions of the bearing proximate the ends, said bearing further having an internal bore to receive a shaft extending between a compressor wheel and a turbine wheel, the internal bore having a plurality of axial grooves extending between the thrust surfaces and wherein each thrust surface incorporates a plurality of radial grooves extending from the inner bore and wherein the thrust surface is circumferentially profiled with a lower flat substantially adjacent each radial groove transitioning to a ramp terminating in an upper land oppositely adjacent the next radial groove, said bearing having a first aperture substantially equidistant from the ends and engaging the locating pin to prevent rotation of the bearing within the bearing case bore, said bearing being free to symmetrically wobble within the bearing case bore, said bearing further having a second aperture substantially centrally located and in communication with a lubrication oil channel entering the bearing case bore in the center housing;
• a thrust washer engaging one of the thrust surfaces on the bearing said thrust washer intermediate the bearing and the compressor wheel;
• and
• thrust runners on an end surface of a hub on each of the compressor wheel and turbine wheel, said thrust runners engaging the thrust surfaces of the bearing.