| 摘要 |
PROBLEM TO BE SOLVED: To suppress an increase in size of an automatic transmission 1 having five friction fastening elements including four planetary gear sets and clutches, and to simplify structure of an oil pressure supply to the clutches.SOLUTION: The automatic transmission 1 is provided in which: first to fourth planetary gear sets PL1 to PL4 are sequentially arranged in this order from one side of an input shaft; a first carrier C1 and a fourth ring gear R4, an output part, a first ring gear R1, a second sun gear S2, a second carrier C2 and a third carrier C3 are always connected to an input shaft 3, a third ring gear R3, a second carrier C2, a fourth sun gear S4, a third sun gear S3 and a fourth carrier C4, respectively. The automatic transmission 1 includes: a first clutch CL1 for connecting/disconnecting between a second ring gear R2 and the third carrier C3; a second clutch CL2 for connecting/disconnecting between the fourth sun gear S4 (or the fourth carrier C4) and the fourth ring gear R4; and first to third brakes B1, B2 and B3 for fixing the first sun gear S1, the first ring gear R1 and the second ring gear R2, respectively. |
