| 摘要 |
In a change-speed gearbox having two countershaft transmissions 3, 4 each connectable by frictional driving clutches 8,9 alternately to an input shaft 1 and having a single common countershaft 7, in each case two gear wheel stages 18-20 of the countershaft transmissions can be optionally connected into the driving connection between input and output shaft 7 and 2 by a change-speed clutch 15. While one of the two gear wheel stages of one countershaft transmission is allocated to the reverse gear, one 24 of the two gear wheel stages of the other countershaft transmission is used both in reverse gear and in 2nd gear. This allows rapid switching between 2nd and reverse ratios to "rock out" the vehicle when the wheels are spinning using the driving clutches 8,9 only. <IMAGE> |
