Method for producing shaft member for hydrodynamic bearing apparatus
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United States of America Patent
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-
Apr 14, 2015
Grant Date -
Sep 29, 2011
app pub date -
May 31, 2011
filing date -
Sep 8, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A shaft material integrally having a shaft portion and a flange portion is formed by a forging process. The end face of the shaft portion of the shaft material and the end face of the flange portion on the opposite side of the shaft portion are ground relative to the corrected face, and the outer circumferential surface of the shaft material is ground relative to the end faces. This renders the cylindricity of the radial bearing faces formed on the outer periphery of the shaft portion of the produced shaft member to be 3 μm or lower. Moreover, a shaft material integrally having the shaft portion and flange portion is formed, while simultaneously thrust hydrodynamic groove regions are formed on both end faces of the flange portion. After the forging process, radial hydrodynamic groove regions are formed on the outer circumferential surface of the shaft portion.
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