SHAFT MEMBER FOR FLUID BEARING DEVICE, MANUFACTURING METHOD THEREFOR, AND FLUID BEARING DEVICE
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United States of America
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Issued Date -
Jan 16, 2020
app pub date -
Aug 31, 2017
filing date -
Aug 31, 2017
priority date (Note) -
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Abstract
A shaft member for a fluid bearing device includes, on an outer peripheral surface thereof, two bearing surfaces (31 and 32) separated from each other in an axial direction, and a middle relief portion (33) formed between the bearing surfaces (31 and 32) and having a diameter smaller than a diameter of the bearing surfaces. The middle relief portion (33) includes a cylindrical surface portion (331) having a ground surface, and stepped portions (332) arranged on both axial sides of the cylindrical surface portion and having a diameter difference from the cylindrical surface portion.
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