Compressor housing

A method of assembling a compressor housing for a turbocharger that includes a rotatable compressor impeller including a bore therethrough, the method including:

• disposing an outer volute about the bore, the outer volute including a back wall and a curved casing, the curved casing defining an airflow-passageway, the back wall extending radially inward from the curved casing, the back wall including a receptacle and a first plurality of annular steps, the receptacle configured to receive an alignment pin that positions a compressor diffuser in the compressor housing;
• arranging the back wall of the outer volute and an impeller cover to at least partially form a cavity configured to receive the compressor impeller, wherein the impeller cover is disposed between an inner volute and the cavity, the impeller cover is configured to fragment during impact with the compressor impeller during a failure condition of the compressor impeller;
• disposing the compressor diffuser between the back wall and the impeller cover, the compressor diffuser including an annular body, a plurality of fins and the alignment pin, the fins disposed between the annular body and the impeller cover, the alignment pin disposed in the receptacle of the back wall of the outer volute;
• and
• disposing the inner volute between the outer volute and the impeller cover, the inner volute including a bridge and an inner ring, the bridge extending between a first end and a second end of the impeller cover, the bridge and the impeller cover defining a chamber, the inner ring and the bridge and the impeller cover defining a pocket-void disposed inside the chamber.

A turbocharger that includes:

• a rotatable turbocharger shaft;
• a compressor impeller disposed in a cavity and mounted via a stud coupled to the rotatable turbocharger shaft, the compressor impeller including a nose end, a hub end and a plurality of blades disposed between the nose end and the hub end, each blade having a rim;
• and
• a compressor housing comprising:
• an outer volute arranged about the stud, the outer volute including a back wall and a curved casing, the curved casing defining an airflow-passageway, the back wall extending radially inward from the curved casing, the back wall proximal to and spaced apart from the compressor impeller, the back wall including a receptacle and a first plurality of annular steps, the receptacle configured to receive an alignment pin that positions a compressor diffuser in the compressor housing;
• the cavity at least partially defined by the back wall of the outer volute and by an impeller cover;
• the impeller cover configured to fragment during impact with the compressor impeller during a failure condition of the compressor impeller, the impeller cover disposed between an inner volute and the compressor impeller;
• the compressor diffuser disposed between the back wall and the impeller cover, the compressor diffuser including an annular body, a fin and the alignment pin, the fin extending from the annular body to the impeller cover, the alignment pin disposed in the receptacle of the back wall of the outer volute;
• the inner volute disposed between the outer volute and the impeller cover, the inner volute including a bridge and an inner ring, the bridge extending from a first end to a second end of the impeller cover, the bridge and the impeller cover defining a chamber, the inner ring and the bridge and the impeller cover defining a pocket-void disposed inside the chamber.