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US 2009/0022439 A1Published application
Fluid dynamic bearing device
AssigneeNtn Corporation
InventorsTetsuya Yamamoto, Kenji Ito, Isao Komori
Life of this patent
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Abstract
A fluid dynamic bearing device having high bearing performance at low cost is provided. A bearing member 6 includes an inner diameter part 8 having a radial bearing surface and an outer diameter part 7 having a mounting surface for a bracket 5. Both the inner diameter part 8 and the outer diameter part 7 are made of a resin. The inner diameter part 8 is preferably formed of an oil-impregnated resin, and more preferably a porous resin, and the outer diameter part 7 is formed of a nonporous resin.
Claims9
A fluid dynamic bearing device comprising:
- a bearing member including an inner diameter part having a radial bearing surface and an outer diameter part having a mounting surface for another member;
- and a radial bearing portion for supporting a shaft to be supported in a radial direction with an oil film formed in a radial bearing clearance which the radial bearing surface faces, characterized in that both the inner diameter part and the outer diameter part of the bearing member are made of a resin.
Dependencies are inferred from the claim text.