| 摘要 |
A six-speed powertrain of an automatic transmission for a vehicle can realize six forward speeds and two reverse speeds with a smaller number of planetary gear sets than that of the prior art by including a stepped pinion type planetary gear set that has corresponding pinion gears of two planetary gear sets connected to each other as one body, and has a simpler scheme such that a small automatic transmission can be realized. Such a transmission has light weight and reduced manufacturing costs.
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