| 摘要 |
<p>A power transmission for a four-wheel drive vehicle includes a change-speed gearing (14) mounted within a transmission casing (11), and an intermediate differential unit (16) assembled within the transmission casing and drivingly connected to an output shaft of the change-speed gearing to be applied with a driving torque through the change-speed gearing for transmitting the driving torque to a first drive shaft (30) for front-wheel drive and to a second drive shaft (18) for rear-wheel drive. The differential unit comprises an input member (50) drivingly connected to the output shaft of the change-speed gearing (14), a plurality of planetary gear sets (Ai, Bi, C1) coaxially arranged within the transmission casing and drivingly connected to the input member, the planetary gear sets being designed to provide a plurality of drive power trains at a different gear ratio, and a shift mechanism (D) arranged to selectively connect one of the planetary gear sets to the first and second drive shafts.</p> |
