| 摘要 |
A four-wheel drive system for a wheeled vehicle, comprising a power unit having an output shaft extending in a lateral direction of the vehicle, a power transmission gear unit including transmission input and output shafts each extending in a lateral direction of the vehicle; and a power distribution gear unit comprising a power distribution shaft having an axis of rotation in a lateral direction of the vehicle and operative to split into two components the driving power carried on the output shaft of the power transmission gear unit, one of the power components being transmitted through a final reduction gear assembly and a wheel drive differential gear assembly to, for example, front road wheels, the other of the driving power components being transmitted to, for example, rear road wheels by way of a right-angle power transfer gear assembly including a driven gear having an axis of rotation in a fore-and-aft direction of the vehicle, the power distribution gear unit further comprising a low-and-high speed shifting clutch mechanism.
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