Ball screw having spacers
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United States of America Patent
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-
Aug 1, 2000
Grant Date -
N/A
app pub date -
Mar 25, 1999
filing date -
Oct 27, 1998
priority date (Note) -
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Abstract
In order to provide a ball screw, ball, which allows to reduce the ball's noise and prevent wearing and clogging of ball s without decreasing its loading capacity, without using a ball chain or spacer balls, a cylindrical spacer 20 is disposed at each area between adjacent balls 10. The spacer 20 includes, at the both axial ends thereof, concave surfaces 22, 22, each of which is complementary to the spherical surface of the ball 10, and a crater-like oil pocket P is formed on the concave surfaces 22, 22 in order to retain a lubricant such as grease. The ball 10 slides in contact with the concave surfaces 22, 22. At that time, the lubricant reduces the friction of the ball 10, while the lubricant is transferred on the ball 10 and distributed over the ball circulation passage thoroughly.
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