| 摘要 |
An automatic transmission having a second ring gear of planetary gear mechanisms and is connected to an input shaft so as to be able to transmit power thereto, and a first sun gear and a second sun gear, and a first carrier that are connected to each other are in turn connected to a third control brake and a first control brake, respectively. A third sun gear and a fourth sun gear of the planetary gear mechanisms are connected to each other, and are in turn detachably connected to the input shaft 14 by a first control clutch. A third ring gear R 2 and a fourth ring gear R 3 are connected to a second control brake and a fourth control brake, respectively. Furthermore, a third carriers is detachably connected to the input shaft by a second control clutch, and a fourth carrier is connected to an output shaft.
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