关键词: 轮胎侧向刚度；客车前轮摆振；侧向力波动；侧向力偏移

Abstract: The steering wheel of a type of pure electric medium-sized bus oscillates slightly and rapidly under high speed driving conditions on good roads, through the analysis of the formation mechanism of front wheel shimmy, seven factors that may cause front wheel shimmy are screened out, and the above factors are analyzed and confirmed one by one by using the elimination method,it is speculated that the difference in tire characteristic parameters may be the cause of front wheel shimmy. Further, by comparing and testing the Y-direction acceleration of the steering wheel when different brands of tires are installed on the faulty vehicle, it is confirmed that the cause of the front wheel shimmy of the vehicle is the problem of the tire's characteristic parameters. After comparing the uniformity parameters of the two types of tires, it is found that the lateral force fluctuation and lateral force offset of the tires matching the faulty vehicle are both large, and the lateral stiffness of the tires is relatively small, which leads to a large amplitude of front wheel shimmy and a small stable area of the front wheel shimmy system, which are the root causes of front wheel shimmy, and finally the problem of vehicle shimmy was effectively solved by replacing tires of other brands.

Key words: Front wheel swing of passenger cars; Lateral tire stiffness; Lateral force fluctuation; Lateral force offset