| 摘要 |
Durability and power transmission efficiency are enhanced in a six-speed powertrain of an automatic transmission by a scheme that includes first to fourth planetary gearsets respectively having operational elements of a sun gear, a ring gear, and a carrier, in which the operational elements of the planetary gearsets are wisely interconnected therebetween or with an input shaft or the transmission case directly or via a clutch or a brake.
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