| 摘要 |
A power transfer unit for directing power to the front wheels and rear wheels of a motor vehicle includes an input, a rear drive shaft driveably connected to the rear wheels, a first gear unit having an output for producing first and second ratios of a speed of the input and a speed of the gear unit output, a differential mechanism driveably connected to the gear unit output for driving right-hand and left-hand front wheels differentially, and a second gear unit driveably connecting the rear driveshaft and the output of the first gear unit.
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