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 formation 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 formed 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 formation 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 formation part and a portion of the scroll chamber formation part, and a shroud piece having at least a portion of the scroll chamber formation 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 is formed by pressure-contacting a pressure-contacting portion that is provided on either one of the scroll piece and the shroud piece with a pressure-contacted portion that is provided on the other one of the scroll piece and the shroud piece so as to cause plastic flow in the pressure-contacting portion.