| 摘要 |
A multi-stage transmission with eight forward and one reverse gear, including input and output shafts, planetary gearsets, gear stages, shift elements and shafts. Input shaft couples the carrier of gearset (P1) and, via clutch (15), can couple shaft (5) that couples the ring and sun gears respectively of 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), can couple the housing via brake (03), and can couple shaft (8), which couples the ring gear of gearset (P3). The carrier of gearset (P2) couples shaft (4), which can couple the output shaft (2) via gear stage (S1) and clutch (24). The carrier of gearset (P3) couples shaft (7), which couples gear stage (S2), which couples the output shaft. A clutch (46, 56 or 45) can engage to block gearset (P2). |
| 主权项 |
1. A multi-stage automatic transmission for a motor vehicle, 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), serving as the output shaft (2) of the transmission, and the first and second spur gear stages (S1, S2) being disposed inside a housing (G); at least third, fourth, fifth, sixth, seventh and eighth rotatable shafts (3, 4, 5, 6, 7, 8); at least five shift elements (03, 15, 24, 38, 45, 46, 56) comprising a brake (03) and first, second, third and fourth clutches (15, 24, 38, 45, 46, 56) which are selectively engagable to provide different transmission ratios between the input shaft (1) and the output shaft (2) such 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) and connectable, by engagement of the first clutch (15), to the fifth shaft (5), and the fifth shaft (5) being connected to the ring gear of the second planetary gear set (P2) and the sun gear of the third planetary gear seat (P3); the ring gear of the first planetary gear set (P1) being connected to the sixth shaft (6) also being connected to the sun gear of the second planetary gear set (P2); the third shaft (3) being connected to the sun gear of the first planetary gear set (P1), being connectable to the housing (G) of the transmission by engagement of the brake (03) and being connectable, by engagement of the third clutch (38), to the eighth shaft (8), and the eighth shaft (8) being connected to the ring gear of the third planetary gear set (P3); the carrier of the second planetary gear set (P2) being connected to the fourth shaft (4), and the fourth shaft (4) being connectable to the output shaft (2) by 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) which is also connected to a first spur gear (ST3) of the second spur gear stage (ST2), and a second spur gear (ST4) of the second spur gear stage (S2) being connected to the output shaft (2); and the fourth clutch (46, 56, 45) being engagable to block the second planetary gear set (P2). |
