| 摘要 |
A spindle motor for hard disk drives having a base-plate, a stator, a rotor, a shaft, a bearing recess formed in either the rotor or the base-plate; and an upper roller bearing and a lower roller bearing. Each roller bearing includes an inner ring and an outer ring. Inner rings are fixedly mounted on the shaft. At least one outer ring is secured to the bearing recess by welding or bonding at predetermined spots located at a first end face of the outer ring. The outer ring is secured to the bearing recess without applying an adhesive between an outer perimeter of the outer ring and the inner wall of the bearing recess.
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