| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing structure of a motor, with which the number of rotations of a shaft of the motor can be held to be substantially constant, even if the temperature changes. SOLUTION: A bearing 4 is engaged with a front opening of a housing 2 of the small motor 1. The front opening is blocked by the bearing 4. Iron cores 8 and commutators 9 are arranged in the housing 2, and the iron cores 8 are fixed to the shaft 7. The shaft 7 is inserted into the bearing 4, the load in the radial direction of the shaft 7 is received by the bearing 4; and thus the shaft 7 can be rotated with respect to the bearing 4. The linear coefficient of thermal expansion of the bearing 4 is lower than that of the shaft 7. COPYRIGHT: (C)2006,JPO&NCIPI
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