Eight-speed planetary layshaft transmission
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United States of America Patent
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-
Oct 16, 2012
Grant Date -
Oct 6, 2011
app pub date -
Nov 29, 2010
filing date -
Mar 31, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A transmission includes an input member, an output member, an intermediate member, and a planetary gear set, all of which are coaxial. A first and a second layshaft are arranged to define a second axis of rotation and a third axis of rotation, respectively. At least three sets of intermeshing gears are provided, some of which are arranged to transfer torque from the input member to the layshafts, and another of which is arranged to transfer torque from the layshafts to the intermediate member via engagement of different respective ones of seven torque-transmitting mechanisms. The seven torque-transmitting mechanisms are engagable in different combinations to establish up to eight forward speed ratios and a reverse speed ratio between the input member and the output member.
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