| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic transmission which can reduce a drag loss in an engagement element.SOLUTION: An automatic transmission comprises: a first double-row planetary gear mechanism 21 having a common carrier C1 which rotatably and pivotally supports a long pinion P2 and a first pinon P1, a first sun gear S1 engaged with the first pinion P1, a second sun gear S2 engaged with the long pinion P2, and a common ring gear R1 engaged with the long pinion P2; and a second double-row planetary gear mechanism 22 having a third sun gear S3, a third ring gear R3 connected to the common ring gear R1, a third carrier C3 which rotatably and pivotally supports a third pinion P3 engaged with the third sun gear S3 and the third ring gear R3, a fourth sun gear S4 connected to the third sun gear S3, a fourth ring gear R4 connected to the third carrier C3, and a fourth carrier C4 which rotatably and pivotally supports a fourth pinion P4 engaged with the fourth sun gear S4 and the fourth ring gear R4.</p> |
