BMW's M diff lock similar to our VLSD?

Pharmacist · 12-24-2011, 01:34 PM

Is the lsd on bmw m cars similar to our vlsd????????????????????

Auto Tech: BMW Variable M-differential lock - Autos.ca

Quote:

The Variable M-differential lock can provide traction advantages even when one wheel is on glare ice. The factor that determines torque transfer is the speed differential of the drive wheels. As soon as one wheel starts to spin, torque is transferred to the other wheel. The greater the speed difference, the more torque is transferred.

To accomplish this, BMW is using a sheer pump located inside the differential. One drive wheel is connected to one part of the pump and the other wheel is connected to the other part. As wheel speeds differ, the pump provides a variable pressure that applies multi-disc clutches preventing the spinning wheel from turning faster than the other wheel.

The pump is a sealed unit that uses high viscosity silicone oil between two sheer discs. As soon as the two sheer discs turn at different rates, the silicone oil is sheered by the grooves in the sheer plates and this generates a pressure dependent on the speed differential of the two plates. Thus, a variable differential lock effect is achieved. As soon as the two wheels are turning the same speed, the pressure of the sheer plates decreases and the differential unlocks.

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