Multi-piece compressor housing for a turbocharger

A compressor housing assembly for a turbocharger assembly comprising:

• an outer shell having an inlet portion having a first outer circumferential surface and a first inner circumferential surface arranged in concentric relation;
• an insert having an inlet portion having a second outer circumferential surface and a second inner circumferential surface arranged in concentric relation, wherein a slot extends through the second inner circumferential surface to the second outer circumferential surface;
• and
• a rear housing structure connected to the outer shell;
• wherein a volute portion is defined by the rear housing structure and the outer shell, a recirculation cavity is defined by the outer shell and the insert, and the slot forms an opening into the recirculation cavity.

A turbocharger comprising:

• a drive source;
• a shaft coupled to and rotated by the drive source;
• a compressor wheel coupled to and rotated by the shaft;
• and
• a compressor wheel housing comprising:
• an outer housing structure having a first tubular portion and a first radial portion extending radially outward of the first tubular portion;
• an inner housing structure having a second tubular portion and a second radial portion extending radially outward of the second tubular portion;
• and
• a rear housing structure having an inner radial portion and an outer radial portion extending radially outward of the inner radial portion;
• wherein the outer housing structure, the inner housing structure, and the rear housing structure are formed separately from each other and are coupled to each other, a recirculation cavity is defined radially between the first tubular portion and the second tubular portion, a volute is cooperatively formed by the first radial portion and the outer radial portion, and a wheel cavity is cooperatively formed by the inner housing structure and the inner radial portion in which the compressor wheel is rotated.