A compressor housing for a turbocharger, which is configured to accommodate an impeller and is configured to be attachable to a center housing that accommodates a bearing device, the compressor housing comprising:
- an intake port configured to suck air toward the impeller;
- a scroll chamber formed in a circumferential direction on an outer-circumference side of the impeller, and configured to allow air discharged from the impeller to circulate;
- a discharge port configured to discharge air circulating through the scroll chamber to an outside;
- and
- an intermediate part through which the discharge port communicates with the scroll chamber, wherein
- the compressor housing is composed of a scroll piece, a shroud piece, and an outer-circumferential annular piece that are dividedly formed and assembled in an axial direction, wherein
- the scroll piece includes:
- the intake port formed through the scroll piece in the axial direction;
- an intake-side wall surface formed on an outer-circumference side of the intake port, the intake-side wall surface constituting a wall surface of the scroll chamber on an intake side;
- a through part formed through the scroll piece in the axial direction, an intake-side end of the through part constituting the discharge port;
- a first intermediate wall surface extended from the intake-side wall surface, being bent toward the intake side to be parallel to the axial direction, and smoothly connected with the discharge port, the first intermediate wall surface constituting part of an inner wall surface of the intermediate part;
- a scroll outer-circumferential part that covers an outer-circumference side of the scroll chamber;
- and
- a joining part provided at the scroll outer-circumferential part to be joined to the center housing, the joining part being configured to be directly joined to joined portions formed at the center housing, so as to directly fix the scroll piece to the center housing,
- the shroud piece includes:
- a shroud-press-fit part of a cylindrical shape press-fitted into the intake port;
- an inner-circumference-side wall surface constituting a wall surface of the scroll chamber on the inner-circumference side;
- a shroud surface opposed to the impeller;
- and
- a diffuser surface extended from the shroud surface to the scroll chamber,
- the outer-circumferential annular piece includes:
- an outer-circumferential annular press-fit part press-fitted into the scroll outer-circumferential part, the scroll outer-circumferential part abutting the outer-circumferential annular press-fit part along an entire innermost circumferential side of the scroll outer-circumferential part extending in the axial direction and along a bottom-most side of the scroll outer-circumferential part extending perpendicular to the entire innermost circumferential side;
- an outer-circumference-side wall surface constituting a wall surface of the scroll chamber on the outer-circumference side;
- and
- a protruding part formed protruding toward the intake side and inserted into the through part in the axial direction,
- wherein an outer diameter surface of the center housing is mated with an inner diameter surface of the outer-circumferential annular piece, and
- wherein the protruding part includes a second intermediate wall surface extended from the outer-circumference-side wall surface, being bent toward the intake side to be parallel to the axial direction, the second intermediate wall surface constituting part of the inner wall surface of the intermediate part, opposing to the first intermediate wall surface.