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US 2012/0237148 A1Published application
Fluid dynamic bearing device
AssigneeNtn Corporation
InventorsHiroshi Niwa, Isao Komori
Life of this patent
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Abstract
A fluid dynamic bearing device which exhibits high bearing performance at low cost has a highly accurate bearing gap. At least a region in the outer circumferential surface of a shaft, which faces the radial bearing gap, is constituted of an electroformed part, and the region of the shaft excluding the electroformed part is constituted of a resin portion.
Claims3
A fluid dynamic bearing device comprising
- a shaft member, a metal part at whose the inner periphery the shaft member is inserted, and a resin portion on whose inner periphery the metal part is retained, the shaft member being supported rotatably by a lubricating film in the radial bearing gap formed between the outer circumferential surface of the shaft member and the inner circumferential surface of the metal part,
- wherein the resin portion is orientated on the outer periphery of the metal part in the axial direction.
Dependencies are inferred from the claim text.