The function of the steering gear is to properly transform the steering torque and steering angle from the steering wheel (mainly to decelerate and increase the torque), and then output it to the steering tie rod mechanism, so that the car can steer, so the steering gear is essentially a deceleration transmission device. There are many types of steering gears, such as rack and pinion type, recirculating ball type, worm crank finger pin type, power steering gear, etc.
