| 摘要 |
The present invention provides a turbocharger capable of reducing its costs and enhancing its performance, and provides a method of producing the turbocharger. The turbocharger 1 includes a compressor housing 2, a bearing housing 6 and a back plate 3. A discharge scroll chamber 12 has such a shape that a cross-sectional area thereof gradually increases toward a discharge port in a circumferential direction. The compressor housing 2 includes a scroll piece 4 and a shroud piece 5 which are assembled to each other. The scroll piece 4 includes a suction port-forming portion 41, a suction-side concave surface 42 and a scroll outer periphery 43. The shroud piece 5 includes a shroud fit-in portion 51, an inner peripheral concave surface 52, a shroud surface 53 and a diffuser surface 54. The back plate 3 includes a facing surface 31, an outer peripheral annular fit-in portion 32 and an outer peripheral concave surface 33. The outer peripheral concave surface 33 has such a shape that a cross sectional shape thereof formed by a plane including a rotation axis of an impeller 13 gradually changes in the circumferential direction. |
