Patent ID: 8888440

Claim:
A compressor of an exhaust gas turbocharger, comprising: a recirculation passage connecting an inlet slit which is opened toward an air passage on a casing of an impeller to an outlet slit that is opened toward an inlet air passage formed in the casing, wherein a part of an air flow through the impeller is taken in the recirculation passage through the inlet slit, and the air taken in the recirculation passage flows toward the inlet air passage, wherein a mating surface of the compressor housing which is divided into compressor housing members in a direction of a rotation axis of the impeller is formed in the neighborhood of an inlet part of the impeller; a space forming the recirculation passage, the inlet slit and the outlet slit are formed between the mating compressor housing members, the mating surface includes comb shaped mating surfaces respectively formed on one of the compressor housing members and the other one of the compressor housing members, and a convex part of one of the comb shaped mating surfaces, formed by a tooth of the comb shaped mating surfaces of the one of the compressor housing members, is fit into a concave part of the other comb shaped mating surface, formed between adjacent teeth of the comb shaped mating surfaces of the other one of the compressor housing members so that a space formed between a tip part of the convex part and a bottom part of the concave part forms the inlet slit and the outlet slit.