| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a new automatic transmission capable of achieving forward 12 speed stages and reverse 1 speed stage.SOLUTION: An automatic transmission 1 includes planetary gear mechanisms PM1-PM4 including sun gears S1-S4, carriers CR1-CR4, and ring gears R1-R4. The first sun gear S1 and the fourth carrier CR4, the first ring gear R1 and the second carrier CR2, the second sun gear S2 and the fourth ring gear R4, and the second carrier CR2 and the third rind gear R3 are respectively connected by connecting elements 31-34. Further the automatic transmission includes clutches C1-C4 capable of engaging the second ring gear R2 and the third carrier CR3, the third connecting element 33 and the third carrier CR, the third sun gear S3 and the fourth carrier CR4, and the third sun gear S3 and the fourth sun gear S4, a first brake B1 capable of locking the second ring gear R2 to an automatic transmission case 17, and a second brake B2 capable of locking the fourth sun gear S4 to the automatic transmission case 17.</p> |
