| 摘要 |
A power train for automatic transmission is provided to reduce a manufacturing cost of the automatic transmission by decreasing a size and a whole length of automatic transmission. An automatic transmission includes first and third planetary gear sets(1,3) as single pinion planetary gear set, and a second planetary gear set(2) as double pinion planetary gear set. The second and third planetary gear sets implement a complexity planetary gear set(CPGS) having first, second, third, and fourth operation elements by driving respective two operation elements among six operation elements. The first operation element is driven by a selected input element. The second and third operation elements are driven by selected and fixed elements. The fourth operation element is driven by an output element. The complexity planetary gear set includes a fifth operation element driven as input element, a sixth operation element driven as fixing element, and a seventh operation element driven as output element. The seventh operation element delivers selectively rotation force to one of the first and second operation elements, and rotation force to the first and second operation elements.
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