VARIABLE DISPLACEMENT TURBINE AND VARIABLE DISPLACEMENT SUPERCHARGER

摘要

PROBLEM TO BE SOLVED: To achieve an increase in a turbine capacity of a variable displacement turbine 29 while sufficiently ensuring the durability of the variable displacement turbine 29.SOLUTION: A rear edge 37T of each turbine blade 37 is constituted by a rear edge tip portion 37Ta and a rear edge hub portion 37Tb. An inclination angleθb of the rear edge hub portion 37b of each turbine blade 37 is set smaller than an inclination angleθa of the rear edge tip portion 37Ta. A radial length S1 from a hub end of the rear edge 37T of each turbine blade 37 to a boundary R between the rear edge tip portion 37Ta and the rear edge hub portion 37Tb is set to 20 to 60% of a radial length S2 of the rear edge 37T of each turbine blade 37.