Ball screw and manufacturing method of nut for ball screw
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United States of America Patent
Stats
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Aug 22, 2017
Grant Date -
Oct 8, 2015
app pub date -
Apr 3, 2015
filing date -
Mar 17, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A ball screw is provided in which an outer circumferential formation is formed at a portion facing a ball circulating passage out of outer circumferential surface of a nut. The ball screw includes: a screw shaft having on its outer circumferential surface a screw groove; a nut having on its inner circumferential surface a screw groove facing the screw groove; a plurality of balls rollably loaded in a spiral ball rolling passage formed by both screw grooves; and a ball circulating passage to return the balls from a start point to an end point of the ball rolling passage for recirculation. The ball circulating passage is a concaved groove formed by concaving a groove on a part of the cylindrical inner circumferential surface of the nut by plastic working. Then, a flange is integrally provided at a portion facing the ball circulating passage and the screw groove.
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