| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic transmission which has forward eight speed steps, and can keep the respective speed changing steps in a good balance. SOLUTION: The automatic transmission comprises a first planetary gear drive PG0 in which a sun gear S0 is driven by the rotation of an input shaft 11, a second planetary gear drive PG1 in which a sun gear S1 and a carrier C1 are connected to the ring gear R0 and the carrier C0, a third planetary gear drive PG2 having the R2 to be rotationally driven by the R1, a fourth planetary gear drive PG3 having the S3 connected to the S2, a first clutch C-1 for selectively connecting the S2 to the input shaft, a second clutch C-2 for selectively connecting the C2 to the input shaft, a first brake B-1 for selectively restricting the rotation of the C0, a second brake B-2 for selectively restricting the rotation of the R2, a third brake B-3 for selectively restricting the rotation of the R0, and a fourth brake B-4 for selectively restricting the rotation of the R3. Further, the automatic transmission comprises a third clutch C-3 for connecting the S0 to the input shaft or for connecting the R2 to the R1. The PG0 to the PG3 are a single pinion type. COPYRIGHT: (C)2008,JPO&INPIT
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