Shaft member for fluid lubrication bearing apparatuses and a method for producing the same
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United States of America Patent
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Mar 5, 2013
Grant Date -
Aug 11, 2011
app pub date -
Apr 20, 2011
filing date -
Sep 8, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A low-cost shaft member for hydrodynamic bearing apparatuses restores the pressure balance in a thrust bearing gap formed on both axial sides of the flange portion in an early stage. A shaft material integrally having a shaft portion and a flange portion with a through-hole between both end faces of the flange portion is formed in a common forging step. As a result, the through-hole is formed to open to an inner diameter side of the bearing gaps avoiding the thrust bearing gaps formed on both end faces of the flange portion of the shaft member as a finished product.
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