| 摘要 |
Disclosed are a lubricant whose oxidation degradation is inhibited, and a dynamic pressure bearing device which has a long lifespan by prolonging the period of time of depression of a lubricating function of the lubricant occurring as a result of oxidation degradation. Ester-based lubricating oil serving as the lubricant is brought into continuous or intermittent contact with an ionic compound or an ionic compound solution obtained by dissolving the ionic compound in a solvent. In the dynamic pressure bearing device, the ionic compound is provided in a portion of a bearing or a shaft member and is thus brought into contact with the lubricating oil, in which the ionic compound or ionic compound solution is substantially insoluble in the ester-based lubricating oil.
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