Patent ID: 8850813

Claim:
A turbocharger, comprising: a turbocharger housing including a turbine housing, a bearing housing that is integral, and a compressor housing, wherein the turbine housing is axially connected to the bearing housing, and the bearing housing is axially connected to the compressor housing, and wherein the bearing housing houses bearings; a rotor configured to rotate within the turbocharger housing along an axial axis of rotor rotation, the rotor including a turbine wheel, a two-sided compressor wheel, and a shaft extending along the axis of rotor rotation and connecting the turbine wheel to the compressor wheel, wherein the bearings constrain the rotor from movement other than axial rotation, and wherein the compressor wheel includes a first set of compressor blades facing axially away from the turbine wheel and a second set of compressor blades facing axially toward the turbine wheel; wherein the compressor housing forms a first shroud wall that substantially conforms to a space through which the first set of compressor blades is configured to rotate, leaving only a small gap there-between; and wherein the bearing housing forms a second shroud wall that substantially conforms to a space through which the second set of compressor blades is configured to rotate, leaving only a small gap there-between.