| 摘要 |
A transmission system for a four wheel drive vehicle includes an input shaft (2) connected to a differential mechanism (4, 6, 10), which has two output shafts (12, 20), which are connected, in use, to respective pairs of driven wheels of the vehicle. The two output shafts carry first and second coaxially mounted sun wheels (S1, S2, respectively), of an epicyclic gear system which mesh with first and second sets of planet wheels (P1, P2, respectively), the epicyclic gear system including a third sun wheel (S3), which is mounted coaxially with the first and second sun wheels and is in mesh with a third set of planet wheels (P3). The gear ratios of the three meshing sun wheels and sets of planet wheels are different.
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