| 摘要 |
A 7-speed power train of an automatic transmission is provided to improve a shifting feeling by using one reverse-Ravigneaux planetary gear set and one Ravigneaux planetary gear set. A reverse-Ravigneaux planetary gear set(DPG1) includes first and second linear gears(R1,R2), first to third planetary carriers(PC1-PC3), and first and second ring gears(R1,R2). The first and second linear gears are connected to a case through a third case. The first and second planetary carriers are gear-coupled with the first and second linear gears. The third planetary carrier is gear-coupled with the first planetary carrier and connected to the case through a fifth brake. The second ring gear is connected to the case through a first brake. A Ravigneaux planetary gear set(DPG2) includes third and fourth linear gears(R3,R4), fourth to sixth planetary carriers(PC4-PC6), and third and fourth ring gears(R3,R4). The third linear gear is connected to the case through the fifth brake. The fourth planetary carrier is connected to the case through the fourth brake. The fifth and sixth planetary carriers are connected to the case through a fourth brake and connected to the input shaft through a second clutch. The third and fourth ring gears are directly connected to the output shaft.
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