Ball screw and assembling method thereof
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United States of America Patent
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Sep 15, 2015
Grant Date -
Jun 12, 2014
app pub date -
Aug 1, 2012
filing date -
Aug 17, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
To improve workability and sealing performance of a coolant when a plurality of nuts in a ball screw are brought into contact with one another, the plurality of nuts being coupled to one another, assembled to one threaded shaft and cooled by flowing the coolant through through-holes formed in the plurality of nuts in axial directions of the plurality of nuts. The ball screw includes counterbores of the through-holes formed on opposing end faces of both of adjoining nuts, and a ring-shaped sealing member inserted thereto. The counterbores are formed such that a depth of one counterbore is larger than a length of the sealing member, and the a depth of the other counterbore is smaller than the length of the sealing member, and such that circumferential positions of the counterbores of the adjoining nuts face each other when a desired preload is exerted.
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