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US 8,616,771 B2Granted
Fluid dynamic bearing device
AssigneeNtn Corporation
InventorHiroshi Niwa
Life of this patent
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Abstract
A flatness of a part of a component formed of a resin material that faces a thrust bearing gap is easily increased. A housing (7) is injection-molded using a resin material and has a bottomed-cylindrical shape integrally including a cylindrical side portion (7a) and a flat bottom portion (7b). The resin material to be used for the injection molding of the housing (7) contains, as filler, a reinforcing fiber having a fiber diameter of 6 to 8 μm and an aspect ratio of 10 to 40.
Claims5
A fluid dynamic bearing device, comprising:
- a stator;
- a rotor;
- a radial bearing portion for holding the stator and the rotor in a radial direction in a non-contact manner by a dynamic pressure action of a fluid that is generated in a radial bearing gap between the stator and the rotor;
- and
- a thrust bearing portion for holding the stator and the rotor in a thrust direction in a non-contact manner by a dynamic pressure action of the fluid that is generated in a thrust bearing gap between the stator and the rotor,
- wherein a part of at least one of the stator and the rotor that faces the thrust bearing gap is formed by injection-molding by using a resin material, and
- wherein the resin material comprises a liquid crystal polymer as a base resin formulated with, as filler, a PAN-based carbon fiber having a fiber diameter of 6 to 8 μm and an aspect ratio of 10 to 40.
4 more elements
Dependencies are inferred from the claim text.