| 摘要 |
<p>The device (1) engages the four wheel drive transmission of a vehicle (2) which comprises two transmission shafts (15 and 13) for the rear wheels (3) and the front wheels (5), a clutch (12) installed along a front shaft (13) and adapted, if engaged, to couple the shafts (15 and 13) for rotation together, and a drive transmission geometry such that mechanically, with the clutch (12) engaged, the mechanical transmission causes the front wheels (5) to be driven slightly faster than the rear wheels (3). The device (1) includes two coupling halves (41) and (42) adapted to connect two portions (13b and 13a) of the front shaft (13) mechanically with the possibility of relative rotation, an element (55) adapted to translate between two end positions corresponding to positive and negative relative rotation between the coupling halves (41 and 42), a sensor (35) for detecting the movement of the element (55), and an electronic central control unit (34) to which the sensor (35) is connected and adapted to control engagement or disengagement of the clutch (12) automatically. <IMAGE></p> |
