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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Nov 21, 2017
Grant Date -
Sep 21, 2017
app pub date -
Jun 6, 2017
filing date -
Feb 20, 2013
priority date (Note) -
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Abstract
A control rod drive mechanism includes an outer tube, a guide tube disposed inside the outer tube, a ball tube, a hollow piston, and an electric motor. A gap between a ball traveling side of the screw shaft and the traveling balls and a gap between the traveling balls and a ball traveling side of the ball nut, having the gap coefficient (A) is given by: A=((2×R−L)−D)÷(2×R−L). The diameter of the traveling balls is determined to satisfy the expression given by A, in which A has the value of more than 0.03 and less than 0.17.
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