| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor, having a deceleration part where press-fitting of a bearing is facilitated without need of high dimensional accuracy, and where pressure is prevented from being locally concentrated on the bearing and a bearing holding hole. SOLUTION: The motor is provided with a motor part having a rotation axis and the deceleration part connected to the motor part. The deceleration part is provided with a gear housing 21, the bearing 22 fixed to the gear housing 21, a worm shaft 24 rotatably supported by the bearing 22 and a worm wheel 25 engaged with the worm shaft 24. A bearing-holding hole 31 to which the bearing 22 is press-fitted is formed in the gear housing 21. A plurality of narrow contact parts 31a, which are brought into contact with the bearing 22 in the circumferential direction in a narrow range and a wide contact part 31b, which is brought into contact with the bearing 22 in the circumferential direction in a range (about 180 degrees) wider than that of the narrow contact parts 31a are formed at the inner periphery of the bearing holding hole 31. The wide contact part 31b is set on the side opposite to an engaging side of the worm wheel 25, as viewed from the shaft direction of the worm shaft 24. COPYRIGHT: (C)2006,JPO&NCIPI
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