Self aligning torque (SAT), also known as aligning torque or aligning moment (Mz, moment about the z direction), is the torque that a tire creates as it rolls along, which tends to steer it, i.e. rotate it around its vertical axis. In the presence of a non-zero slip angle, this torque tends to steer the tire toward the direction in which it is traveling, hence its name.[1][2]
The magnitude of this torque can be calculated as the product of the lateral force generated at the contact patch and the distance behind the wheel centre at which that force acts. This distance is known as the pneumatic trail. The steering torque around a non-vertical steer axis with non-zero mechanical trail is given by:
Even if the slip angle and camber angle are zero, and the road is flat, this torque will still be generated due to asymmetries in the tire's construction and the asymmetrical shape and pressure distribution of the contact patch. Typically for a production tire this torque reaches a maximum at 2–4 degrees of slip (this figure depends on many variables) and falls to zero as the tire reaches its maximum lateral force capability.
^Hans Pacejka (2005). Tyre and Vehicle Dynamics. Elsevier. p. 113. ISBN 9780080543338. Retrieved 2018-04-06. The self-aligning torque now reads: Mz = ...
^Vittore Cossalter (2006). Motorcycle Dynamics. Lulu. p. 59. ISBN 9781430308614. Retrieved 2018-04-06. generates a moment that tends to rotate the tire in such a way as to diminish the slip angle. For this reason this moment is called the self-aligning moment.
and 28 Related for: Self aligning torque information
Selfaligningtorque (SAT), also known as aligningtorque or aligning moment (Mz, moment about the z direction), is the torque that a tire creates as it...
described as the pneumatic trail, and so creates a torque on the tire, the so-called selfaligningtorque. There are two main ways to measure slip angle of...
known as pneumatic trail, it tends to generate a torque about a vertical axis known as selfaligningtorque. The diagram is misleading because the reaction...
contact patch begins sliding) and this creates a torque on the tire called the selfaligningtorque. Because the direction of the side-slip is towards...
cornering stiffness, camber thrust, lateral force compliance steer, selfaligningtorque, lateral weight transfer, and compliance in the steering system....
asymmetries in its mass distribution may cause it to apply periodic forces and torques to the axle, which can cause ride disturbances, usually as vertical and...
nickel-plated brass. In the center of the exterior end is a metal pin aligned with the long axis of the tube; the pin's end is approximately flush with...
95 inches (2.4 m) in diameter and also feature a hydraulically operated self-centering four-jaw chuck with clamping jaws that can clamp from 14 to 58...
treated separately from rolling resistance because it is due to the applied torque to the wheel and the resultant slip between the wheel and ground, which...
normal to the plane of the contact patch. One torque generated by a tire, called the selfaligningtorque, is caused by asymmetries in the side-slip along...
model accuracy in frequency domain above about 250 Hz. Contact patch Selfaligningtorque Slip (vehicle dynamics) Thermal analysis Heat transfer Rachel Evans...
very well is that it models the relationship between slip angle, selfaligningtorque and cornering force - and it does this better than anything that...
generates a traction force to oppose the motion of the vehicle. As braking torque increases, the tire deforms more and tread elements near the rear of the...