| 摘要 |
PURPOSE: A dynamic pressure fluid bearing is provided to prevent the events such as reduction of a lifetime in a spindle motor and deterioration in intensity of a bearing by preventing oil from being leaked. CONSTITUTION: Working oil between a shaft(8) and a sleeve(14) is moved toward the center of a groove(22) if a spindle motor is revolved so strong pressure as to be operated between the shaft and the sleeve. The oil between the shaft and the sleeve is pushed upwards by the pressure. However, the oil stays at grooves(24,26) if a user controls the angle of the groove(24) on the upper area of the shaft to prevent the leaked oil from being raised upwards any more. The oil is absorbed to the groove(22) again if the shaft is stopped. The groove(26) provided on the shaft functions to store oil.
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