| 摘要 |
A dual clutch transmission comprises a layshaft 38 having a range coupler 66 which connects pinions 50, 54 to the layshaft 38, thereby driving pinions 52, 56 fixed to output shaft 12 so as to provide a low range torque path and a high range torque path. A first clutch 14 drives a first input shaft 16 which has gears 28, 30, 32 that mesh with gears 34, 36, 40 mounted on the layshaft 38. A second clutch 18 drives a second input shaft 20 which has gears 22, 24, 26 that mesh with gears 42, 44, 46 also mounted on the layshaft 38. Gears 42, 44, 46 and 34 are releasably engaged by couplers 60, 62 with the layshaft 38 while gears 30, 32 are releasably engaged by a coupler 64 to input shaft 16. The gears 22, 24, 26 are permanently fixed to the input shaft 20 and gear 36 is non- releasably mounted on the layshaft 38. This transmission avoids parasitic losses and provides small torque steps during launch and economic fuel savings. |
