Four-wheel steering system for automobile

The invention discloses a four-wheel steering system for an automobile. The steering system comprises a traditional steering system and an independent steering system, wherein front wheels adopt the pinion-and-rack traditional steering system, and rear wheels adopt the independent steering system; the rear wheel independent steering system is composed of motors, a reduction mechanism and a transmission mechanism, the motors are rotary motors, and the reduction mechanism is a worm and gear mechanism; the transmission mechanism comprises a vehicle frame, the left rear wheel corresponds to one rotary motor, the right rear wheel corresponds to one rotary motor, and the two rotary motors are independent of each other and control the steering motion of the corresponding wheels. By the adoption of the four-wheel steering mode, the defects of a traditional steering system are overcome, the front wheels and the rear wheels conduct antiphase steering during low-speed turning, and then the turning radius of the automobile is reduced to improve maneuverability; the front wheels and the rear wheels mainly conduct in-phase steering during high-speed turning, the side slip angle of the automobile can be reduced, the steady-state overshoot of the automobile yaw rate can be reduced, and the handling stability of the automobile is further improved.