| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the generation of vibration or noise by improving the bending rigidity of a shaft. <P>SOLUTION: A rotor shaft 72 has a resolver 80 mounted at one end as a rotary position detection sensor, a planetary gear mounted at the other end, and both the ends having different inner diameters Ba, Bb and a flange 72a formed to support a rotor core 74. In the rotor shaft 72, stepped parts 72b, 72c are formed into cylindrical shapes having uniform inner diameters Bc larger than the inner diameters Ba, Bb of both the ends from both the ends toward an inside. Thus, sectional secondary moment to the bend of the rotor shaft 72 can be increased, and bending rigidity can be improved while increasing weight and suppressing a size increase. Accordingly, the vibration of the rotor shaft 72 accompanied by the drive of the motor and the rotation of the planetary gear can be suppressed. As a result, the generation of vibration or noise based on the rotor shaft 72 can be suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
