| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dynamic pressure fluid bearing disc drive excellent in durability in which leakage of lubricant is suppressed by making a dynamic pressure generation groove at a predetermined angle in the radial direction at a dynamic pressure bearing part. SOLUTION: A bearing comprises a shaft 1 having one sealed end, and a sleeve 7 to be fitted over the shaft 1 through a lubricant 20 wherein any one of the shaft 1 or sleeve 7 serves as a rotator. The shaft 1 or sleeve 7 is provided, on the rotary sliding face thereof, with a radial dynamic pressure bearing part. The radial dynamic pressure bearing part is provided with a plurality of hooked grooves 1a, 1b extending along the rotational direction from a center, i.e., a line perpendicular to the axis of shaft 1, and generates a hydraulic pressure in the radial direction. When the groove angleθ2 on the sealing side of groove 1a, 1b is set smaller than the groove angleθ1 on the other side, specific performance for suppressing leakage of lubricant can be attained, for example.
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