| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic transmission for a vehicle, in which a plurality of frictional components and a speed change automation mechanism are mounted to a simple planetary-gear set and a speed change mechanism of a manual transmission, thus allowing convenience of an automatic transmission to be pursued while excellent efficiency of the manual transmission is virtually maintained.SOLUTION: An automatic transmission for a vehicle includes a first speed changing part T1 and a second speed changing part T2. The T1 outputs intermediate speeds MS of a decelerated constant speed by using rotational power from a first variable input path VIP1 selectively connected to the first input shaft IS1 and a direct input path. The T2 shifts each MS transmitted from the first to fourth gears, a reverse gear, and the T1 to five final speeds. The T1 includes the first-third operating members AM1-3, wherein rotational power is always input to the AM1, the AM2 selectively stops, and the AM3 always operates as an output member. An MS of the T1 is selectively transmitted to the T2 through variable input paths VIP2 and 3. The T2 includes an input shaft IS2 to which an MS of the T1 is transmitted through the VIP2, an input shaft IS3 to which an MS of the T1 is transmitted through the VIP3, the first intermediate shaft disposed in parallel with and selectively connected to the intermediate shafts IS2 and 3 to achieve the first and second gear ratios and the second intermediate shaft to achieve the third and fourth gear ratios. The first and second intermediate shafts are selectively connected to the IS2 to achieve a reverse gear ratio. |
