Hydrostatic bearing apparatus, machine-tool main-spindle apparatus including hydrostatic bearing apparatus, and method for manufacturing hydrostatic bearing apparatus
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United States of America Patent
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Nov 21, 2017
Issued Date -
N/A
app pub date -
Jan 20, 2016
filing date -
Jan 23, 2015
priority date (Note) -
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Abstract
A hydrostatic bearing apparatus includes a bearing metal having a hydrostatic portion that allows a grinding wheel shaft to be rotatably supported. The hydrostatic portion has a bearing clearance, a bearing surface portion, a plurality of pockets, and partition plates. Clearances are each formed between the corresponding partition plate and an edge of the corresponding pocket in a rotating direction of the grinding wheel shaft. The clearances are formed in the pocket at upstream and downstream ends in the rotating direction. The bearing clearance has a first bearing clearance and a second bearing clearance. The second bearing clearance is larger than the first bearing clearance.
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