US Patent 7950227 High response compact turbocharger

An exemplary compressor for a turbocharger includes a compressor wheel that includes first and second compressor faces oriented back-to-back and a bore for mounting the compressor wheel to a shaft along a rotational axis of the compressor wheel; and a compressor housing that includes a first air inlet oriented to pass inlet air in an axial direction along the rotational axis to the first compressor face, a second air inlet positioned a distance radially from the rotational axis and oriented to pass inlet air in an axial direction parallel to the rotational axis and radially toward the rotational axis to the second compressor face, and a single volute that receives compressed air from the first and second compressor faces.