| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric motor, in which a sleeve can be mounted to a rotation shaft with high accuracy. <P>SOLUTION: In an electric motor 11, a rotation shaft 12 defines an outer periphery 21 having a diameter reduced from a large-diameter position 17 having a first diameter toward a small-diameter position 18 having a second diameter smaller than the first diameter. A sleeve 13 is fitted with the outer periphery 21 of the rotation shaft 12 on an inner periphery having a diameter reduced from a front end adjacent to the large-diameter position 17 toward a rear end adjacent to the small-diameter position 18, and is interference-fitted. According to this constitution, the sleeve 13 is fitted with the outer periphery 21 of the rotation shaft 12 almost entirely on the inner periphery 22. A fastening force by a jamming of the sleeve 13 acts on the outer periphery 21 of the rotation shaft 12 almost evenly on the entire inner periphery 22 of the sleeve 13. Additionally, a fastening torque is not locally applied to the rotation shaft 12, and therefore, deformation or distortion of the rotation shaft 12 are avoided. The sleeve 13 can be mounted to the rotation shaft 12 with high accuracy. <P>COPYRIGHT: (C)2013,JPO&INPIT |
