Heavy-duty trailers are long and wide. In order to reduce the turning radius of the trailer and the lateral offset of the wheels during steering, most of them use a hydraulic-mechanical transmission all-wheel steering mechanism. The length of its horizontal tie rod is adjustable, and the tie rod is connected with the intermediate connecting plate of each axis, so that the wheels of each axle can rotate according to the specified different angles.
It generally has three working modes: traction steering driven by the drawbar; controlled steering by manual manipulation or electrical switch manipulation; central automatic steering driven by the rotatable carrier frame behind the long cargo trailer. Usually, when the heavy-duty vehicle train runs on the straight section of the highway and the larger curve, the flatbed trailer uses the traction steering, and the long cargo trailer uses the center automatic steering; when passing through the smaller curve or parking in place at the loading and unloading site, the control steering is used; Bridge trailers also use controlled steering in order to precisely follow the required line or stop.
