An automatic transmission having seven gear speeds for forward driving is
provided, in which a planetary gear P1 of a first planetary gear set 12
and an outer planetary gear P2out of a second planetary gear set 14 are
integrally coupled, a first rotational element M1 is formed by a sun gear
S1, a second rotational element M2 is formed by carriers CA1, CA2 coupled
with each other, a third rotational element M3 is formed by a ring gear
R2, a fourth rotational element is formed by a ring gear R1, and a fifth
rotational element M5 is formed by a sun gear S2. The rotational elements
M5, M3, M2 are connectable to an input shaft 16 via clutches C1, C2, C3,
respectively, and the rotational elements M3, M2, M1 are connectable to a
case 20 via brakes B1, B2, B3, respectively. The rotational element M4 is
integrally coupled with an output gear 18.
