E0025 tire contact patch(camber part 2) - camber thrust, camber vs sideslip - EulSeoggy Ko

The tire contact patch is symmetric shape without camber and there is no lateral deformation. Hence, no lateral force appear. When the wheel has a camber, tire contact patch goes different on its shape. its inside is wider than outside along the longitudinal direction. This asysmetric shape produces a lateral deformation of tire. Hence, a lateral force is produced. The camber thrust can be shown considering the tire geometry. The resultant force can be described as the integration of shear stress over the tire conrtact patch. The camber angle is not fixed angle. It may change depending on driving conditions. As an example. In the right turn, cg location moves to the upper left because of centripetal force and accordingly the tire load increases in the left tire. Therefore,the camber angle gets smaller in the left wheel and bigger in the right wheel. Lateral force due to camber is independent of sideslip angle. In other words, we can secure the additional lateral force produced by negative camber on top of that by the sideslip angle. The total lateral force is the sum of lateral forces due to sideslip angle and camber angle. Normally lateral force due to camber is 5 to 8 times less than that due to sideslip angle when their anglesare numerically the same. Negative camber makes Lateral force linearly increase in proportion to the camber angle. On the other hand, positive camber makes Lateral force linearly decrease in proportion to the camber angle.