SPEED CHANGE DEVICE
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United States of America Patent
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app pub date -
Apr 28, 2016
filing date -
Apr 30, 2015
priority date (Note) -
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Abstract
An automatic transmission includes: a first gear train that includes a first drive gear always coupled to a first ring gear of a Ravigneaux type planetary gear mechanism and a first driven gear which is always coupled to an output gear and to which power is transferred from the first drive gear; a second gear train that includes a second drive gear always coupled to a first carrier of the Ravigneaux type planetary gear mechanism and a second driven gear which is rotated in the same direction as the first driven gear by power from the second drive gear, the second gear train having a gear ratio that is different from that of the first gear train; and a clutch that connects and disconnects the second driven gear and the output gear to and from each other.
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