IMPELLER FOR TURBOCHARGER, METHOD FOR MANUFACTURING SAME, TURBOCHARGER, AND TURBO UNIT

摘要

An impeller (50) for a turbocharger comprises a hub section (51) and a plurality of fin sections (52, 53). The hub section (51) is roughly in the shape of a truncated cone and is formed such that the hub section diameter increases gradually in the direction of the axis of rotation (ZC). The fin sections (52, 53) are formed on the surface of the hub section (51) and impel, radially outward, a fluid that has flowed in from the direction of the axis of rotation (ZC). A plurality of groove sections are formed in the surface of the hub section (51) and the surfaces of the fin sections (52, 53). The plurality of groove sections formed in the surfaces of the fin sections (52, 53) are formed in the direction in which the fluid that has flowed in from the direction of the axis of rotation (ZC) flows radially outward when the impeller rotates. Ridge sections that project from the groove sections are formed between neighboring groove sections. The ridge sections in the region near the axis of rotation (ZC) are lower than the ridge sections in the region far from the axis of rotation (ZC).