MULTIPLATE Clutch Assembly

The aim of the multiplate clutch assembly is to prevent excessive differential slip and therefore maximize the traction performance of the vehicle. This is fundamentally different from the 'braked' traction control, which can only counteract differential slip when it occurs.

A certain amount of differential slip is required to allow the vehicle to turn corners and to remain stable under control of the Anti-lock Brake System (ABS). The Transfer Case Control Module (TCCM) monitors the drivers demands through the primary vehicle controls and automatically sets the slip torque at the differential. The system is completely automatic and does not require any special driver input.

The multiplate clutch assembly actively controls the torque flow through the center differential and optimizes the torque distribution in the driveline. The multiplate clutch assembly biases the torque from the transmission to the front differential or rear differential and wheels with the higher grip. This torque biasing prevents the wheels with the lower grip from spinning.

The multiplate clutch assembly comprises:

• A drive chain sprocket, which is connected to the front differential side gear
• Clutch levers with the ball ramp mechanism
• Clutch hub as support for the clutch plates
• Clutch piston to generate friction between the clutch plates
• Pack of cup springs to return the clutch piston into its original position.

One set of friction plates are connected to the clutch hub, the other set of friction plates are connected to the multiplate clutch basket, which is welded to the center differential housing.