TURBINE FOR SUPERCHARGER AND METHOD FOR ASSEMBLING SUPERCHARGER

摘要

A purpose of the invention is to make size and weight reduction possible and to make assembly easier while maintaining the high response performance required in a supercharger or the like for an automobile, wherein a rotor blade upstream flow channel space (s2) of a cylindrical part (22) gradually diminishes from an upstream side to a downstream side in a swirling direction of exhaust gas (e) in accordance with the diminishing of volume of a scroll chamber (s1). Specifically, a back plate (24) is formed so as to gradually swell out toward a rotor blade from the upstream side to the downstream side in the swirling direction of the exhaust gas (e) in accordance with the diminishing of volume of the scroll chamber (s1). The amount of swelling of the back plate (24) passes a communication part (d) to approach a rotor blade (16), and at a terminal end reaches a position adjacent to a front edge (16a) of the rotor blade (16). Therefore, there is substantially no flow channel space (s2) at the terminal end.