| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure strength for a compression force in an axial direction without elongating the whole length of the yoke of a motor. SOLUTION: A yoke of a motor has a large diameter portion 1a forming a motor, a shaft supporting portion 1b connected to the large diameter portion 1a and having a smaller diameter than the large diameter portion 1a and a small diameter portion 1c connected to the shaft supporting portion 1b via a tapered portion 1d and having a still smaller diameter than the shaft supporting portion 1b. A material pipe having the diameter of the shaft supporting portion 1b is swaged to the diameter of the small diameter portion 1c, thereby increasing the thickness of the tapered portion 1d from the shaft supporting portion 1b to the small diameter portion 1c, whereby, even when the tilting angle of the tapered portion 1d for an axis is increased, a compression strength for an external force in the axial direction of the yoke can be ensured and hence the length of the tapered portion 1d in the axial direction can be shortened, which can ensure a necessary compression strength without elongating the whole length of the yoke.</p> |
