Control systems for single-clutch axle drive mechanisms.

摘要

A part-time four-wheel drive vehicle has a transfer case 14 and a split axle drive mechanism 28 for selectively driving two vehicle wheels 24. The split axle drive mechanism has a clutch 58 associated with one of the differential side gears 50 for preventing back drive to the transfer case in the two-wheel drive mode. A control system for operating the clutch in response to the operational mode of the transfer case comprises a vacuum motor 92 and a solenoid-operated two-way valve 94 energizable by means of a switch 154 in the transfer case. The control system also includes a pneumatic time delay 103 and a vacuum check valve 96.