DC motor with directionally determined torque
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United States of America Patent
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Aug 14, 2012
Grant Date -
Oct 8, 2009
app pub date -
Apr 3, 2008
filing date -
Apr 3, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device and method for matching the rates of speed at which an electric motor that is drivingly connected to a worm gear raises and lowers a window in an automobile power window assembly. By axially displacing the motor's armature, and/or by varying the thread and tooth profiles of the worm and the gear, the amount of torque produced by the motor and transmitted through the worm gear can be altered. In order to compensate for the effect of gravity on the motor load and on the window's speed of ascent and descent, more torque is provided when the window is being raised and less torque is provided when the window is being lowered.
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