| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing structure capable of reducing the number of parts and cost and enhancing mounting accuracy in a magnetic disk drive with a magnetic seal. SOLUTION: A staged part 1a is formed at a through hole 2 of a motor hub 1, a bearing 3 is pressed into the through hole 2 so as to be fixed, and a lower pole piece 21 which has a bent part 21b on the outer circumference is pressed in between the through hole 2 and the outer periphery of the bearing 3 of the motor hub 1 to be brought into contact with the staged section of the staged part 1a. As a result, a rotor unit 20 is formed by fixing the lower pole piece 21 and the bearing 3 so that a prescribed space may be kept. The inner ring of the bearing 3 of the rotor unit 20 is bonded and fixed onto a stationary spindle 9, thereby ensuring a prescribed space between the lower pole piece 21 and the stationary spindle 9. |
