How Many Turns for Steering Wheel to Return to Center?

[MacSimon]

Different vehicles require varying numbers of turns for the steering wheel to return to center, typically ranging from one and a half to two and a half turns. Below is relevant information about the self-aligning torque: Cause: When the wheel rolls, the longitudinal axis aa of the tire contact patch not only shifts a certain distance from the wheel plane but also rotates by an angle α. As a result, the front part of the contact patch is closer to the wheel plane with smaller lateral deformation, while the rear part is farther with greater lateral deformation. Principle: When the lateral force Fy increases to a certain level, some parts at the rear of the contact patch reach the adhesion limit. As Fy further increases, more portions will reach this limit until the entire contact patch undergoes lateral slip. Consequently, the pneumatic trail gradually decreases as the lateral force increases.