Automatic transmission

摘要

An automatic transmission (10) includes in a transmission case (11), an input (an input shaft 12), an output (an output shaft 13), first to fourth planetary gear sets (PG1, PG2, PG3, and PG4) of a single pinion type, first to third clutches (CL1-CL3) engaging and disengaging predetermined rotating elements of the first to fourth planetary gear sets, a first brake (BR1) engaging and disengaging a third ring gear (R3) with and from the transmission case, and a second brake (BR2) engaging and disengaging a first sun gear (S1) and a fourth sun gear (S4) with and from the transmission case. The input, the output, the planetary gear sets, the clutches, and the brakes are arranged coaxially with each other. The first, second, third, and fourth planetary gear sets are arranged in this order from one axial end to the other axial end of the automatic transmission.

主权项

1. An automatic transmission mounted in a vehicle, the transmission comprising in a transmission case: an input engaged with a power source;
an output; a first planetary gear set being of a single pinion type, and including a first sun gear, a first carrier, and a first ring gear; a second planetary gear set being of the single pinion type, and including a second sun gear, a second carrier, and a second ring gear; a third planetary gear set being of the single pinion type, and including a third sun gear, a third carrier, and a third ring gear; a fourth planetary gear set being of the single pinion type, and including a fourth sun gear, a fourth carrier, and a fourth ring gear; a first clutch; a second clutch; a third clutch; a first brake; and a second brake, wherein the input, the output, the planetary gear sets, the clutches, and the brakes are arranged coaxially with each other, the first, second, third, and fourth planetary gear sets are arranged in sequential order from one axial end to an other axial end of the automatic transmission, the input and the first carrier are engaged, the first sun gear and the fourth sun gear are engaged, the first ring gear and the second sun gear are engaged, the second carrier and the fourth carrier are engaged, the third carrier and the fourth ring gear are engaged, the output, the second carrier, and the fourth carrier are engaged, the first clutch engages and disengages the input and the first carrier with and from the third sun gear, the second clutch engages and disengages the first ring gear and the second sun gear with and from the third sun gear, the third clutch engages and disengages the second ring gear with and from the third sun gear, the first brake engages and disengages the third ring gear with and from the transmission case, and the second brake engages and disengages the first sun gear and the fourth sun gear with and from the transmission case.