Turbocharger compressor wheel assembly with boreless hub compressor wheel

A compressor wheel assembly, comprising:

• a compressor backplate defining a backplate opening;
• a rotatable shaft having a first end;
• a compressor wheel having a boreless hub supporting an array of impeller blades, and a mounting member formed integrally with and extending coaxially from said hub into said backplate opening;
• said shaft first end and said mounting member including means for interconnecting said shaft first end to said mounting member in generally coaxial alignment;
• spacer means for axially positioning said compressor wheel with respect to said shaft;
• a seal flange rotatable with said shaft and disposed within said backplate opening in generally concentrically spaced relation between said mounting member and said backplate;
• and
• at least one seal ring carried by said seal flange in sealing relation with said backplate.

In combination with a turbocharger having a center housing, a shaft extending through said center housing, bearing means for rotatably supporting said shaft, and a turbine wheel mounted on one end of said shaft, an improved compressor wheel assembly, comprising:

• a compressor backplate defining a backplate opening;
• a rotatable shaft having a threaded end;
• a centrifugal compressor wheel having a boreless hub supporting an array of impeller blades, and a mounting sleeve formed integrally with and extending coaxially from said hub, said mounting sleeve defining an internally threaded bore, said mounting sleeve extending into said backplate opening and having said shaft end threaded into said mounting sleeve bore, said mounting sleeve and said shaft respectively defining axially opposed first and second shoulders when said shaft end is threaded into said mounting sleeve bore;
• a thrust collar spacer including a collar segment interposed axially between said first and second shoulders in abutting relation therewith when said shaft end is threaded into said mounting sleeve bore to axially position said compressor wheel relative to said shaft, said thrust collar spacer further including an annular seal flange extending axially into said backplate opening in generally concentric spaced relation between said mounting sleeve and said backplate within said backplate opening;
• at least one seal ring carried by said seal flange in substantially sealed engagement with said backplate;
• and
• a thrust bearing carried by said thrust collar spacer and axially retained between said center housing and said backplate for retaining said shaft in a predetermined axial position relative to said center housing.

A compressor wheel assembly comprising:

• a rotatable shaft having a threaded end;
• a centrifugal compressor wheel having a boreless hub supporting an array of impeller blades, and a mounting sleeve formed integrally with and extending coaxially from said hub, said mounting sleeve defining an internally threaded bore, said mounting sleeve having said shaft end threaded into said mounting sleeve bore, said mounting sleeve and said shaft respectively defining axially opposed first and second shoulders when said shaft end is threaded into said mounting sleeve bore;
• a thrust collar spacer including a collar segment interposed axially between said first and second shoulders in abutting relation therewith when said shaft end is threaded into said mounting sleeve bore to axially position said compressor wheel relative to said shaft, said thrust collar spacer further including an annular seal flange extending axially in generally concentric spaced relation about said mounting sleeve;
• and
• at least one seal ring carried about said seal flange.