| 摘要 |
A multi-stage transmission with eight forward and one reverse gear including planetary gearsets, shafts, and shift elements. The sun gear of gearset (P1) couples shaft (3) and the ring gear of gearset (P4) and can couple the housing via brake (03). The drive shaft couples the carrier of gearset (P1) and can couple shaft (5) via clutch (15). Shaft (5) couples the ring and sun gears of respective gearsets (P2, P4). The ring gear of gearset (P1) couples shaft (6) and the sun gear of gearset (P2). Shaft (8) couples the carrier and sun gears of respective gearsets (P4, P3). Shaft (4) couples the carrier of gearset (P3) and can couple the housing via brake (04). Output shaft couples the ring gear of gearset (P4) and can couple, via clutch (27), shaft (7), which couples the carrier of gearset (P2). Clutch (67, 56, 57) engages to block gearset (P2). |
| 主权项 |
1. A mufti-stage automatic transmission for a motor vehicle, the transmission comprising:
a drive shaft (1) and an output shaft (2); first, second, third and fourth planetary gear sets (P1, P2, P3, P4) being arranged in a housing (G), and each of the first, the second, the third and the fourth planetary gear sets comprising a sun gear, a ring gear and a carrier; at least third, fourth, fifth, sixth, seventh and eighth rotatable shafts (3, 4, 5, 6, 7, 8); at least five shift elements (03, 04, 15, 27, 56, 57, 67) comprising first and second brakes (03, 04) and first, second and third clutches (15, 27, 56, 57, 67) whose selective engagement results in different transmission ratios between the drive shaft (1) and the output shaft (2) so that eight forward gears and one reverse gear are implementable; the sun gear of the first planetary gear set (P1) is connected to the third shaft (3), and the third shaft (3) being couplable to the housing (G) via the first brake (03) and being connected to the ring gear of the fourth planetary gear set (P4); the drive shaft (1) being directly connected to the carrier of the first planetary gear set (P1) and also being detachably connectable to the fifth shaft (5) via the first clutch (15), and the fifth shaft (5) only directly interconnecting the ring gear of the second planetary gear set (P2) with the sun gear of the fourth planetary gear set (P4); the ring gear of the first planetary gear set (P1) being connected to the sixth shaft (6), and the sixth shaft (6) also being connected to the sun gear of the second planetary gear set (P2); the eighth shaft (8) being connected to the carrier of the fourth planetary gear set (P4) and the sun gear of the third planetary gear set (P3), the fourth shaft (4) being connected to the carrier of the third planetary gear set (P3) and the fourth shaft (4) being connectable to the housing (G) via the second brake (04); the output shaft (2) being directly connected to the ring gear of the third planetary gear set (P3); the seventh shaft (7) being directly connected to the carrier of the second planetary gear set (P2), and the output shaft (2) also being directly connected to the second clutch (27) for detachably connecting the seventh shaft (7) to the output shaft (2); and the third clutch (67, 56, 57), when engaged, facilitating blocking of the second planetary gear set (P2). |
