Ball screw device having spacers
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 9, 2002
Grant Date -
N/A
app pub date -
Oct 24, 2000
filing date -
Oct 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ball screw device utilizes spacers having concave ball-contacting surfaces with distributed protrusions or dimples. Balls having needle-like recesses may also be used. The spacers are provided in two thicknesses, and the relative numbers of the thinner and thicker spacers are selected in order to ensure retention of the spacers in their proper positions, while providing a small clearance between the balls and spacers to avoid fluctuations or sharp increases in dynamic torque.
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