Rotary joint device, method of machining rotary joint device, and main shaft driving apparatus for machine tool including rotary joint device
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United States of America Patent
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Apr 14, 2015
Grant Date -
Oct 18, 2012
app pub date -
Feb 9, 2012
filing date -
Apr 15, 2011
priority date (Note) -
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Abstract
A rotary joint device includes attachment grooves formed at positions in an outer peripheral surface of an outer cylinder, each attachment groove being formed so as to straddle a pair of adjacent cylindrical blocks and so as to be exposed from the outer peripheral surface of the outer cylinder, each attachment groove having a bottom surface that is machined to form a flat surface in a state in which the cylindrical blocks are combined, and positioning blocks corresponding to the attachment grooves on a one-to-one basis and each having an attachment phase that is uniquely set to a corresponding one of the attachment grooves in the axial direction and in a circumferential direction of the outer cylinder, each positioning block having an attachment surface corresponding to the bottom surface of a corresponding one of the attachment grooves, the attachment surface being machined so as to form a flat surface.
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