① Safe and reliable operation: the steering system directly affects the driving safety of the vehicle, so all parts are required to have sufficient rigidity, strength and wear resistance, and the connecting parts must be firm and reliable. With the increase of vehicle speed, higher requirements are put forward for working reliability.
② Handy and flexible handling: When the car is driving on a narrow and curved road to turn, the steering system must ensure that the front wheels can be turned flexibly, smoothly and accurately. The steering wheel shall be stable and free of vibration and shimmy when the vehicle is running in a straight line.
③ Appropriate steering force: if there is no other obstacle, the steering force is larger when the vehicle stops, and decreases with the increase of the vehicle speed. Therefore, in order to drive easily and get better feedback from the road, it should be lighter when driving at low speed and heavier when driving at high speed.
④ Smooth turning performance: when the car turns, the force acting on the steering wheel is appropriate, the steering is flexible and smooth, and has the function of automatic centering.
⑤ The impact from the road is small: the steering device must not lose control of the steering wheel and cause reversal due to the uneven road surface, and the impact force should be small.