Patent ID: 8043187

Claim:
An automatic transmission for vehicles, comprising: a first shift portion outputting three intermediate rotational speeds of a same rotational speed as an input rotational speed, an increased rotational speed, and a reverse rotational speed by using torque received through first and second variable input pathways; and a second shift portion comprising first, second, third, and fourth gears that respectively achieve first, second, third, and fourth gear ratios, changing each intermediate rotational speed received from the first shift portion into four final rotational speeds, and outputting the same; wherein the first shift portion comprises first, second, and third operating members; and wherein the first operating member selectively receives the torque through the first variable input pathway or is selectively stopped; the second operating member selectively receives the torque through the second variable input pathway or is selectively stopped; and the third operating member is always operated as an output member; wherein the first shift portion is a planetary gear set provided with a sun gear, a planet carrier, and a ring gear as operating members thereof, and wherein the planet carrier is operated as the first operating member, the sun gear is operated as the second operating member, and the ring gear is operated as the third operating member.