Gap expanding method of ball screw and fine motion control rod drive mechanism incorporating gap expanded ball screw
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United States of America Patent
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Jul 4, 2017
Grant Date -
Aug 21, 2014
app pub date -
Feb 4, 2014
filing date -
Feb 20, 2013
priority date (Note) -
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Abstract
It is an object of the present invention to provide a gap expanding method of a ball screw for preventing an increase in torque relative to an electric motor due to a protruding bulge caused by generation of a scar on the traveling side of the screw shaft of the ball screw, and to provide a control rod drive mechanism incorporating the gap expanded ball screw. In a ball screw disposed in a control rod drive mechanism, the ball screw has a screw shaft and a ball nut engaged with the screw shaft via travelling balls, and the balls are each configured to have a diameter smaller than that of the existing ball, thereby expanding a gap between a ball traveling side of the screw shaft and the ball and a gap between the ball and a ball traveling side of the ball nut.
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