Rotary table device provided with cooling structure and rotary bearing provided with cooling structure
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United States of America Patent
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May 14, 2013
Grant Date -
Jan 6, 2011
app pub date -
Feb 16, 2009
filing date -
Feb 29, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotary table device includes a cooling structure and a rotary bearing provided with a cooling structure. A rotary table device provided with a cooling structure includes a hollow motor as a drive source, a table rotated by the hollow motor, and a rotary bearing supporting rotational motion of the table, in which the rotary bearing includes an outer ring having an inner peripheral surface to which a rolling surface is formed, an inner ring having an outer peripheral surface to which a rolling surface facing the rolling surface of the outer ring is formed, and a number of rolling members in a rolling passage formed by the rolling surface of the outer ring and the rolling surface of the inner ring, and a heat sink is formed to either one of the inner and outer rings.
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