When the steering wheel rotates, th

When the steering wheel rotates, the steering shaft drives the steering screw to rotate, and the force is transmitted to the steering nut through the steel ball, so that the steering nut moves along the axis. The rack on the nut drives the gear sector and the shaft to rotate, which in turn drives the steering rocker arm to swing and realize the wheel deflection through the transmission of other steering gear. If the tooth top surface of the rack is made into a drum arc surface, the pitch circle radius of each tooth on the gear sector will change accordingly, so that the pitch circle radius of the middle tooth is small, and the pitch circle radius at both ends is large, then the steering gear with variable transmission ratio can be obtained, so as to save operation effort, easy to turn.