A compressor wheel assembly and turbocharger

A compressor wheel assembly includes a metal tubular insert having a shaft hole extending from an inlet end to an outlet end, a wall member having a circumferential outer surface and an opposing circumferential inner surface, the circumferential inner surface defining the shaft hole, at least one of the circumferential outer surface or the inner surface including at least one engagement member; acompressor wheel member made of a polymer material having an axially extending central portion molded onto the insert, the blade array protruding outwardly from the central portion; a shaft having anouter surface extends through the insert, with at least one contoured surface region on an inner surface of the insert engaging the outer surface of the shaft. The compressor wheel member is connectedto an insert that engages the shaft. An engagement member may be defined on the circumferential outer surface. The insert may be comprised of a suitable metal. The utility model further relates to aturbocharger comprising the