Methods and devices for altering the transmission ratio of a drive system
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United States of America Patent
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Feb 19, 2013
Grant Date -
Sep 18, 2008
app pub date -
Jul 12, 2004
filing date -
Jul 14, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The transmission ratio between a first motor and an output shaft is varied by changing the speed of a second motor. The first and second motors are coupled to the output shaft with a planetary gear set. The first and second motors may both add power to the drive system.
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