| 摘要 |
PROBLEM TO BE SOLVED: To smoothly remove air bubbles entrained into lubricating fluid in a hydrodynamic bearing apparatus of which the minute clearance between a shaft member and a sleeve member is entirely filled with the lubricating fluid. SOLUTION: The hydrodynamic bearing apparatus is provided with a shaft member 11 having a shaft part 111 and a thrust plate part 112, a sleeve member 12 made of porous sintered compact, a sleeve supporting member 13, a thrust bush member 14 for sealing a lower aperture of the sleeve supporting member 13, and the lubricating fluid for entirely filling the minute clearance. The shaft member 11 is supported by providing two or more radial hydrodynamic pressure generating grooves 121a, 121b for supporting a radial load on the shaft part 111 and the inside peripheral surface of the sleeve member 12 facing the shaft part 111, and by providing a thrust hydrodynamic pressure generating grooves 141 for supporting a thrust load on the lower side surface of the thrust plate part 112 and the inside surface of the thrust bush member 14 facing the lower side surface of the thrust plate part 112.
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