| 摘要 |
PROBLEM TO BE SOLVED: To fix a holding ring to a cylindrical opened end portion of a stepped sleeve with a single bag-shaped dead-end so that the holding ring and a thrust ring of a flanged shaft are aligned in parallel with each other, in the hydrodynamic pressure bearing in which the flanged shaft having the thrust ring, the stepped sleeve with a single bag-shaped dead-end, and the holding ring are major structural components. SOLUTION: The hydrodynamic pressure bearing is comprised of the flanged shaft 1, the stepped sleeve with a single bag-shaped dead-end forming a small- diameter cylinder portion, a large-diameter cylinder portion, and the cylindrical opened end portion in order, the holding ring 5 press-fitted the cylindrical opened end portion of the stepped sleeve 4 with a single bag-shaped dead-end by mating upper-end faces of both members each other, lubricating oil filled in a minute gap including a thrust gap and radial gap formed among these structural members, and a dynamic pressure generating groove arranged in the thrust gap and radial gap. Further, a connecting portion (w) between the holding ring 5 and the sleeve is jointed by means of slant-directional welding.
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