| 摘要 |
PROBLEM TO BE SOLVED: To improve torque resistance capacity of a rotor shaft by suppressing fastening power of an inner shaft and an outer shaft from becoming nonuniform in a rotation axis direction.SOLUTION: A padding part 56 that rises outwardly in a radial direction toward an inner peripheral surface of an inner cylinder part 42 is provided at a portion 52a positioned at an inner peripheral side of a coupling part 46 at an outer peripheral surface of a thin wall part 52. With the padding part 56, concerning an interference of shrink fitting, an interference at the portion 52a positioned at the inner peripheral side of the coupling part 46 at the thin wall part 52 becomes larger than an interference at a portion 54a positioned at an inner peripheral side of the coupling part 46 at a thick wall part 54, and becomes partially larger at the portion 52a. Thereby, surface pressure between the portion 52a positioned at the inner peripheral side of the coupling part 46 at the thin wall part 52 and the inner cylinder part 42 can be increased after the shrink fitting. |
