| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic transmission for a vehicle having wider ratio coverage with a proper step ratio.SOLUTION: An automatic transmission for a vehicle includes a first planetary gear group 1 having four rotary elements, and a second planetary gear set 2 having three rotary elements. These rotary elements are arranged on a common velocity diagram according to intervals corresponding to gear ratios of the first planetary gear group and the secondary planetary gear set to be applied as a first element to a seventh element. An input shaft I is connectable to a first element 11 by a first clutch 3, connectable to a fifth element 21 by a second clutch 4, and connectable to a third element 12 by a third clutch 5, an output member 9 is constantly connected to a second element 14, the third element 12 is fixable to a stationary portion 8 by a first brake 6, a fourth element 16 is constantly connected to a sixth element 24, one of the fifth element 21 and the sixth element 24 is fixable to the stationary portion 8 by a second brake 7, and a seventh element 22 is constantly fixed to the stationary portion 8.</p> |
