Differential ball screw and nut assembly and method of obtaining relative linear motion differentially
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
Aug 14, 1997
filing date -
Aug 14, 1997
priority date (Note) -
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Abstract
A differential ball screw and nut assembly has an axially and rotatably fixed nut with an internal helical groove having a first lead to cooperate with a tubular ball screw having an external helical groove with a corresponding lead to provide a first raceway for a train of balls. The tubular ball screw also has an internal helical groove of the same hand with a second reduced lead relative to the first lead. A second rotatably fixed, radially inner screw having an external helical groove with a lead corresponding to the second lead cooperates with the internal groove of the tubular screw to provide a second raceway. A second train of load bearing balls transmits load between the tubular screw and second screw to move the screws differentially an axial distance corresponding to the number of rotations of the tubular screw times the lead differential.
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