There have been many forms of steering gear throughout history, but many have since been obsolete. According to the classification of power assistance, the steering gear can be divided into mechanical type (without power assistance) and power type (with power assistance).
Mechanical steering gear can be divided into rack and pinion type, circulating ball type, worm crank finger type, circulating ball crank finger type, worm roller type and so on according to different structural forms. Commonly used are rack and pinion type, circulating ball type, worm crank finger type.
The rack and pinion steering gear is one of the simplest steering gears. It has the advantages of simple and compact structure, high rigidity, low cost, sensitive steering, high forward and reverse attack rates, easy to arrange, and is especially suitable for use with candle suspension and MacPherson suspension, and can also be directly Drive the tie rod to simplify the steering transmission mechanism. Therefore, it is widely used in cars and micro and light trucks.
The recirculating ball steering gear has high forward and reverse attack rates, so it is easy to operate, has a long life, and works stably and reliably; however, due to the high reverse attack rate, it is easy to transmit the impact force of the road surface to the steering wheel.