| abstract |
There is provided a fluid dynamic pressure bearing apparatus including a shaft, a bearing sleeve rotatably supporting the shaft, and a lubricating oil filled between the shaft and the bearing sleeve, wherein at least one of the shaft and the bearing sleeve is formed of a copper alloy containing 0.8 wt % to 5 wt % of lead, and a base oil of the lubricating is a member selected from the group consisting of monoester, dibasic acid diester, diol ester and mixtures thereof, and the lubricating oil contains 0.1 wt % to 1 wt % of condensed phosphate ester. The fluid dynamic pressure bearing apparatus is capable of suppressing the hydrolysis of the lubricating oil, and the wear of the shaft and the bearing sleeve. |