The intermediate support of the drive shaft is usually installed on the frame beam, which can compensate the installation error of the drive shaft in the axial and angular directions, as well as the displacement caused by the engine movement or the frame deformation when the road wrecker is running. The intermediate support usually uses elastic elements to meet the above requirements, which are mainly composed of bearings, covers with oil seals, brackets, and elastic elements. Some cars use a swing-type intermediate support, which can swing around the support shaft, which improves the stress condition of the bearing when the engine moves axially. The rubber bushing can accommodate small changes in the position of the drive shaft axis in the transverse plane.