Patent ID: 7377872

Claim:
A seven-speed powertrain of an automatic transmission for vehicles, wherein a first shift portion and a second shift portion are disposed on the same shaft axis, the first shift portion comprising a first planetary gear set formed as a double pinion planetary gear set and a second planetary gear set formed as a single pinion planetary gear set, and the second shift portion comprising a third planetary gear set formed as a single pinion planetary gear set and a fourth planetary gear set formed as a single pinion planetary gear set, and wherein: the first shift portion is combined by one clutch and two brakes, so as to realize three forward speeds with rotation power input through an input route from an input shaft; and the second shift portion is combined by one clutch and two brakes so as to realize seven forward speeds and three reverse speed with rotation power input through an input route from the first shift portion and a variable input route from the input shaft.