What is the purpose of the kingpin inclination angle?

[OOwen]

The purpose of the kingpin inclination angle is to enable the vehicle's wheels to automatically return to the straight-ahead position after steering. The larger the angle, the stronger the self-centering effect, but the more effort is required to turn the steering wheel, and tire wear increases. It also makes steering easier. The following is an introduction to the kingpin inclination angle: Introduction to the kingpin inclination angle: The kingpin inclination angle also reduces the distance between the intersection point of the kingpin axis with the road surface and the intersection line of the wheel center plane with the ground. This decreases the force the driver needs to apply to the steering wheel, making steering operation easier, while also reducing the impact force transmitted from the steering wheels to the steering wheel. However, the kingpin inclination angle should not be too large, as it would accelerate tire wear. Introduction to the kingpin center rotation: When the wheel rotates around the kingpin, the lowest point of the wheel would theoretically sink below the road surface. In reality, the lower edge of the wheel cannot sink below the road surface; instead, the steering wheel and the entire front part of the vehicle are lifted to a corresponding height. This creates an effect where the vehicle's own gravity helps the steering wheels return to their original central position, making it easier for the steering wheel to reset.