| 摘要 |
<p>A transmission is described for a vehicle having a first permanently engaged axle and a second selectively engaged axle. The transmission comprises a coupling (100) for selectively applying torque to the second axle of the vehicle to switch between two wheel drive and four-wheel drive in dependence upon slipping of the wheels of the first axle. The coupling comprises first and second members (14,26), arranged to rotate with the first and second axle, respectively, the members (14,26) having teeth (22,24) which mesh with one another, and a rotary fluid valve (34) sensitive to the rear wheel slip dependent relative angular position of the first and second members for actuating a jacking means (50) that is operative to enable and disable the transmission of drive torque through the coupling. <IMAGE></p> |
