| 主权项 |
1. A vehicle transmission comprising:
a main transmission configured to output the number of revolutions per unit time of a power source at a predetermined gear ratio by performing switching between a plurality of speed-changing gear pairs; a sub-transmission disposed downstream of the main transmission and configured to convert an output of the main transmission selectively at one of two different gear ratios, the sub-transmission being configured to be switched by a manual operation; main transmission shift position sensing means for sensing a gear position of the main transmission; and sub-transmission shift position sensing means for sensing a gear position of the sub-transmission, wherein the main transmission is an automatic transmission which performs gear shifting with gear shift timing according to one of gear shift maps, the one gear shift map being selected in accordance with a throttle opening degree of a vehicle and a vehicle speed, the sub-transmission is configured to be switched between a drive position and a low position having a larger reduction ratio than the drive position, the gear shift maps comprise a first gear shift map corresponding to the drive position of the sub-transmission and a second gear shift map corresponding to the low position thereof, and the vehicle transmission further comprises map switching means for performing switching between the first gear shift map and the second gear shift map in accordance with sensing signals from the sub-transmission shift position sensing means. |
