Hydrodynamic bearing device and disk rotating apparatus

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Reexamination Certificate

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Reexamination Certificate

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07492548

ABSTRACT:
In a hydrodynamic bearing device in which a radial bearing face having a dynamic pressure generating groove on a shaft or an inner periphery of a sleeve is provided and a clearance between the shaft and the sleeve is filled with lubricant, an annular depression is provided on one end face of the sleeve adjacent to a rotor hub and a cover plate for covering the depression is attached to the sleeve so as to define a reservoir for the lubricant or air for the purpose of preventing such a risk that absence of an oil film occurs in clearances of a bearing of the hydrodynamic bearing device due to outflow of oil upon forcing of the oil by air received into the bearing. A step portion is provided on the other end face of the sleeve such that the step portion and the reservoir are communicated with each other by a communication hole. During operation of the hydrodynamic bearing device, air in the hydrodynamic bearing device reaches the reservoir via the communication hole so as to be discharged from the reservoir.

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patent: 5822846 (1998-10-01), Moritan et al.
patent: 2003/0039416 (2003-02-01), Hino
patent: 2003/0161558 (2003-08-01), Kishi
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patent: 2002-101610 (2002-04-01), None
patent: 2002-349549 (2002-12-01), None
patent: 2003-120025 (2003-04-01), None
patent: 2003-247547 (2003-09-01), None

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