Ball screw assembly with enhanced radial load capacity and method of construction thereof
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United States of America Patent
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Feb 10, 2015
Grant Date -
Aug 2, 2012
app pub date -
Jan 31, 2012
filing date -
Jan 31, 2011
priority date (Note) -
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Abstract
A linear ball screw assembly and method of construction thereof is provided. The assembly includes a screw having a helical external groove and a ball nut having a through bore configured for receipt of the screw therethrough and including a helical internal groove radially aligned with the external groove of the screw to form a helical raceway. A plurality of axial load balls are disposed in the helical raceway. The nut includes a pair of non-grooved internal cylindrical surfaces extending in axially opposite directions from the internal groove along the external groove of the screw to provide outer surfaces of a pair of radial load raceways. A plurality of radial load balls are disposed in the radial load raceways. The radial and axial load balls have different diameters and/or the internal cylindrical surfaces are provided by a pair of sleeve inserts.
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