| 摘要 |
PROBLEM TO BE SOLVED: To ensure rotating accuracy in an axial direction by prevent slip-off in the axial direction at the time of high speed rotation, and also to prevent vibration and oscillation. SOLUTION: In a dynamic pressure, a shaft 3 is fixed on either one center part of a fixing member 2 and a rotating member 1, a sleeve 8 is fixed on the other center part, they are engaged with each other, and a dynamic pressure bearing is formed between the shaft 3 and the sleeve 8. A thrust plate 7 is fixed on the shaft 3, the thrust plate 7 is arranged on a circumferential recessed part 10 formed on the inner circumferential surface of the sleeve 8, and thereby, a thrust dynamic pressure bearing is formed between the upper/lower surfaces of the thrust plate 7 and the circumferential recessed part 10.
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