| 摘要 |
PROBLEM TO BE SOLVED: To improve performance by suppressing the rattling of a ball bearing assembled in a motor case and enhancing the maximum number of rotation of a rotary shaft. SOLUTION: In a direction current motor wherein both end parts of the rotary shaft 9 are rotatably supported by the ball bearings 10 assembled in both end faces of the motor case 1, O rings 15 are attached to a position adjacent to the ball bearings 10 on the rotating shaft 9 in the motor case 1. The O rings 15 are pressed against the inside face of the inner laces 10a of the ball bearings 10 to give the inner laces 10a a pressing force in a thrust direction.
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