| 摘要 |
A four-wheel drive system for a vehicle, comprising an engine having an output shaft rotatable about an axis in a lateral direction of the vehicle; a transmission gear unit including transmission input and output shafts parallel with the axis of rotation of the engine output shaft; a first wheel drive gear unit comprising power splitting gear means to split driving power from the transmission output shaft into two driving power components, and a first differential gear assembly to split one driving power component into two output power components to be transmitted to one pair of road wheels, the power splitting gear means and the first differential gear assembly being aligned with the transmission output shaft in a lateral direction of the vehicle; and a second wheel drive gear unit comprising a second differential gear assembly to split the other driving power component into two output power components to be transmitted to another pair of road wheels; the first wheel drive gear unit further comprising final reduction gear means positioned axially between the power splitting gear means and the first differential gear assembly, and power transfer gear unit intervening between the power splitting gear means and the second wheel drive gear unit and operative to transmit therethrough the driving power component to the second differential gear assembly.
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