| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic pressure fluid bearing device capable of reducing the influence of a centrifugal force acting on lubrication liquid. SOLUTION: This dynamic pressure fluid bearing device is provided with a shaft body 104, a sleeve body 106 having a sleeve part 122 sleeve-fitted in a shaft part 108 of the shaft body 104 and a thrust support part 128 fitted externally in a thrust plate part 110, radial bearing parts 136, 138 for supporting the shaft part 108 and the sleeve part 122 so as to rotate relatively and freely, thrust bearing parts 144, 146 for supporting the thrust plate part 110 and the thrust support part 128 so as to rotate relatively and freely, and lubrication liquid filled into these bearing parts. The sleeve body 106 is provided with a second ventilation hole 158 for communicating with the outside, and a second enlarged clearance part 162 on an inner peripheral face of the thrust support part 128 communicates with the second ventilation hole.
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