| 摘要 |
PROBLEM TO BE SOLVED: To provide a built-in motor main-shaft device capable of reducing thermal displacement in a main shaft.SOLUTION: A sleeve 28 is interposed in between the main shaft 32 and a rotor 24. A press-fitting section between the main shaft 32 and the sleeve 28 is composed of a plurality of first pressure-connected parts 30 disposed with some space in the circumferential direction, and first thermal-conduction blocking parts 31 each disposed in between the first pressure-connected parts 30. A press-fitting section between the sleeve 28 and the rotor 24 is composed of a plurality of second pressure-connected parts 26 disposed with some space in the circumferential direction, and second thermal-conduction blocking parts 27 each disposed in between the second pressure-welding parts 26. Both the first and the second thermal-conduction blocking parts 31, 27 are disposed so that either one of the first and the second blocking parts 31, 27 exists, when viewed in every radial direction from the center of the main shaft 32 on the cross-section orthogonal to the axial direction at a predetermined position in the axial direction of the main shaft. |
