| 摘要 |
A vehicle (1) with connectable four-wheel drive provided with: an engine (4) having a drive shaft (5); a pair of main drive wheels (3); a main transmission line (7) which permanently connects the drive shaft (5) to the main drive wheels (3) and comprises a main gearbox (10) and a main differential (11); a pair of normally driven secondary drive wheels (2); and a connectable secondary transmission line (15) for connecting the drive shaft (5) also to the secondary drive wheels (2) and having a geared transmission (17), at least one secondary clutch (16) which on one side is connected to the drive shaft (5) upstream of the main gearbox (10) and on the other side is connected to the secondary drive wheels (2), and a continuously variable transmission (20) which is controlled electronically to vary its transmission ratio in a continuous manner between two limit values without ever interrupting the transmission of the driving torque. |
