Compressor housing for turbocharger and method for manufacturing the same

A compressor housing for a turbocharger configured to house a compressor impeller, the compressor housing comprising:

• an intake port part that defines an intake port configured to suck in air toward the compressor impeller;
• a shroud part that surrounds the compressor impeller in a circumferential direction and has a shroud surface facing the compressor impeller;
• a diffuser part that is on an outer circumferential side of the compressor impeller in the circumferential direction and forms a diffuser passage configured to allow compressed air discharged from the compressor impeller to pass therethrough;
• and
• a scroll chamber part that forms a scroll chamber configured to guide the compressed air passing through the diffuser passage to outside;
• wherein the compressor housing is dividably composed of a plurality of pieces including a scroll piece having at least the intake port part and a portion of the scroll chamber part, and a shroud piece having at least a portion of the scroll chamber part, a portion of the diffuser part, and the shroud part,
• wherein the scroll piece and the shroud piece are assembled to each other by press-fitting a press-fitting portion of the shroud piece into a press-fitted portion of the scroll piece, and
• wherein a seal part that seals the scroll piece and the shroud piece comprises a pressure-contacting portion on one of the scroll piece and the shroud piece and a pressure-contacted portion on the other one of the scroll piece and the shroud piece that are in pressure contact with one another such that there is plastic deformation in the pressure-contacting portion.