| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary unit that can improve pressure feed efficiency of fluid.SOLUTION: A rotary unit RU comprises: a supercharger rotary shaft 44; an impeller 50 that is attached to the supercharger rotary shaft 44 and pressurizes fluid sucked from the side of one end part 44a of the supercharger rotary shaft 44; and a fastening member 85 that presses the impeller 50 in the axial direction of the supercharger rotary shaft 44 to fix it to the supercharger rotary shaft 44. The fastening member 85 internally includes a female thread part 106 screwed with a male thread part 104 of the supercharger rotary shaft 44, and an outer surface 85b of a tip part 85a of the fastening member 85 is formed in a shape with a reduced diameter that is tapered continuously and smoothly as getting away from the impeller 50. |
