| 摘要 |
A multi-stage transmission with eight forward and one reverse gear, including drive and output shafts, planetary gearsets, gear stage, shift elements and shafts. 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, P3). The ring gear of gearset (P1) couples shaft (6), which couples the sun gear of gearset (P2). Shaft (3) couples the sun gear of gearset (P1) and the ring gear of gearset (P3) and can couple the housing via brake (03). The carrier of gearset (P2) couples shaft (4), which can couple the output shaft via gear stage (S1) and clutch (24). The carrier of gearset (P3) couples shaft (7), which can couple the output shaft via gear stage (S2) and clutch (27), and clutch (46, 56, 45) engages to block gearset (P2). |
| 主权项 |
1. A multi-stage automatic transmission for a motor vehicle, the transmission comprising:
an input shaft (1) and an output shaft (2); first, second and third planetary gear sets (P1, P2, P3), each of the first, the second and the third planetary gear sets comprising a sun gear, a ring gear and a carrier; first and second spur gear stages (S1, S2) being connected to a countershaft, disposed parallel to a longitudinal axis of the first, the second and the third planetary gear sets (P1, P2, P3), and serving as the output shaft (2) of the transmission, the first and second spur gear stages (S1, S2) being disposed inside a housing (G); at least third, fourth, fifth, sixth and seventh rotatable shafts (3, 4, 5, 6, 7); at least five shift elements (03, 15, 24, 27, 45, 46, 56) comprising a brake (03) and first, second, third and fourth clutches (15, 24, 27, 45, 46, 56) whose selective engagement results in different transmission ratios between the input shaft (1) and the output shaft (2) so that eight forward gears and one reverse gear are implementable; the input shaft (1) being connected to the carrier of the first planetary gear set (P1), the input shaft (1) being detachably connected to the fifth shaft (5) via the first clutch (15), and the fifth shaft (5) being directly connected to the ring gear of the second planetary gear set (P2) and the sun gear of the third planetary gear set (P3); the ring gear of the first planetary gear set (P1) being connected to the sixth shaft (6) which is also connected to the sun gear of the second planetary gear set (P2); the third shaft (3) being directly connected to the sun gear of the first planetary gear set (P1) and to the ring gear of the third planetary gear set (P3) and being connectable to the housing (G) of the transmission, via the brake (03); the carrier of the second planetary gear set (P2) being connected to the fourth shaft (4), and the fourth shaft (4) being detachably connected to the output shaft (2) via the first spur gear stage (S1) and the second clutch (24); the carrier of the third planetary gear set (P3) being connected to the seventh shaft (7), and the seventh shaft (7) being detachably connected to the output shaft (2) via the second spur gear stage (S2) and the third clutch (27); and the fourth clutch (46, 56, 45) being engagable for blocking the second planetary gear set (P2). |
