F97/F98�Complete�Vehicle
4.�Powertrain
31
F97/F98,�M�GHAS�external�view
Demand-controlled�lock
The�lock�is�a�demand-controlled�rear�axle�differential�lock�which�is�active�in�the�following�situations:
• Pullaway
• Differential�speed�at�the�rear�axle�for�straight-ahead�driving�under�tension�due�to�various
coefficients�of�friction,�left/right
• M�dynamic�cornering�tensioned
• Power�oversteer�(slight�steering�drift�in�MDM�mode)
• Stabilization�in�coasting/overrun�mode.
Traction,�handling�and�driving�stability�are�optimized�by�adjusting�a�defined�differential�speed�or
differential�torque�at�the�rear�axle.
The�regulated�M�rear�axle�differential�lock�works�with�a�position-controlled�electric�motor�and�a�ball
ramp.
4.3.6.�Structure/Function
The�lock-up�torque�is�generated�by�a�multidisc�clutch.�The�necessary�axial�pressure�is�applied�to�the
multidisc�clutch�by�the�position-controlled�direct�current�motor�by�means�of�gears�and�a�ball�ramp
mechanism.�The�clutch�package�operates�between�the�expansion�tank�housing�(steel�outer�discs)�and
the�right�output�(steel�inner�discs�with�carbon�friction�lining).
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