Self aligning torque


Self aligning torque

Self aligning torque, also known as the aligning torque, SAT or Mz, is the torque that a tire creates as it rolls along that tends to steer it, ie rotate it around its vertical axis. Even if the slip angle and camber are zero, and the road is flat, this torque may still be generated due to assymetries in the tire's construction. Typically for a producion tire this torque reaches a maximum at 2-4 degrees of slip (this figure is very dependent on a lot of things) and falls to zero as the tire reaches its maximum lateral force capability.

Reference

Milliken and Milliken "Race Car Vehicle Dynamics" Chapter 2


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