In the vehicle with a long drive shaft, the intermediate support (bearing) is generally provided. The middle support of the soft close rubber door buffers is usually installed on the frame beam, which is used to compensate for the installation error of the drive shaft, and the displacement caused by engine movement or frame deformation when the car is running. Rubber buffer is usually made up of elastic elements to meet the above requirements. It is mainly composed of bearings, covers with oil seals, supports and elastic elements. Some cars use swing middle support, it can swing around the support shaft, improve the engine axial movement of bearing force. Rubber buffer blocks can accommodate a small change in the position of the drive shaft axis in the transverse plane.