Abstract:The moving track is broadened when a truck-trailer goes round curverin a road.In general,the increment of the track of a shaft style truck-trtrailer is less than that of a seperating style one.The track increment of a truck-trailer equipped with tail shaft turning compensator is just half of thatof a seperation style truck-trailer.So,it is an effective method to set tailshaft to reduce the track increment.The length of a tail shaft for a trucktrailer can vary according to horizontal and vertical arc conditions and thetail structure of the truck-trailer,and the tail shaft is designed as a multijoint device which can be pulled forth and back.