| 摘要 |
In a hydrodynamic bearing device with which the lubricant is prevented from leaking to the outside, and good seal performance can be maintained, and in a spindle motor equipped with this hydrodynamic bearing device, the hydrodynamic bearing device includes a shaft, a sleeve, a lubricant that fills a microscopic gap, a radial bearing portion, a thrust bearing portion, and a bearing seal portion. The value of a function P1/V1, where V1 is a fluctuation volume of the sleeve in the axial direction and P1 is a capillary pressure index at a vapor-liquid interface located near the opened end of the bearing seal portion, is at least a specific value.
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