Ball nut and screw assembly with backdrive control
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United States of America Patent
Stats
-
Nov 21, 1995
Grant Date -
N/A
app pub date -
Apr 25, 1994
filing date -
Apr 25, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ball nut and screw assembly has a backdrive control member that travels with the ball nut and has an internal thread complementary to and engaging the helical ball receiving groove on the screw. The backdrive control member is indexable on the screw relative to the ball nut to adjust the load of a spring that is interposed between the control member and ball nut. The spring acts to urge these components apart and thereby determine the frictional drag of the threaded engagement between the control member and the ball screw. The preload of the spring is set by indexing the control member to effect sufficient drag to prevent axial loads on the nut and screw from causing backdrive translation of the nut. The backdrive control member also removes lash from the ball nut and screw assembly under reversing loads at load magnitudes equal to or less than that produced by the load spring.
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