Structure Optimization And Durability Research Of Heavy Commercial Vehicle Thrust Rod

Heavy commercial vehicles account for a large proportion in the current transportation,with the continuous development of transportation industry in china, the ratio will continueto increase. Therefore, the transportation safety of heavy commercial vehicles has becomethe focus for many people.The middle and rear balancing suspension on heavy commercial vehicle will generallyadopt6(above the suspension is V propelling rod assembly) or8(above the suspension is Ipropelling rod assembly) thrust rods assembly, which consist Rod structure, at the same timethe Rod structure and the steel plate spring both transfer forces and torque between groundand vehicle. The steel plate spring mainly conveys vertical force, the forces and momentsacting on the other directions mainly rely on thrust rods assembly to transmit. So theproblem of safety and life of thrust rod assembly both become our concern. Therefore,designing a better thrust rod structure and a longer life of the thrust rod are importantguarantees for transport safety.Heavy commercial vehicles in starting, braking and acceleration, the rubber ball joint ofrod assembly will frequently subject to tension and compression, but the stretching ability ofthe rubber material is very poor, but it can bear very strong compression. Therefore, in orderto improve the fatigue life of thrust rod assembly, the rubber ball hinge assembly with rubberis pre-compressed, the amount of pre-compression can guarantee the rubber ball hinge trynot to bear tension in the work process.Compressed rubber ball hinge of thrust rod assembly is divided into: radial compressionball joint, two compression ball hinges assembled by opposite direction and axialcompression ball joint, but the main way of compression is radial direction compression. Atthe same time, the way of rubber ball hinge compression in thrust rod assembly is also usedradial compression ball joint in this paper. The material application of thrust rod assembly rubber, not only can play the role ofreducing vibration, but at the same time, the most important function is to transfer forceusing the deformation of rubber material. Therefore, one of the important research contentsof rubber material is also studied in this paper. The domestic current research of the thrustrod assembly has not formed a complete set of design process and assembly platform, whilethe abroad study about thrust rod assembly is very mature. So this thesis with the help ofscientific research corporation and manufacture, using the mature finite element analysistechnology, optimizing the thrust rod assembly structure, and predicting the fatigue life ofthrust rod assembly. The main research contents of this paper are as follows:Firstly, studying the role of all parts and the failure forms of the thrust rod assembly.According to the2-D models provided by the manufacturers and combining with the realentity, putting all parts of the thrust rod assembly together into a3-D entity.Secondly, basing on the establishment of3-D model thrust rod assembly, meshingmodel into element, introducing elements into the finite software adding materials, boundaryconditions and loading. Finally obtaining the finite element thrust rod assembly model,through calculating and analyzing, obtaining the stress and strain of the thrust rod assemblymodel.Thirdly, according to the thrust rod assembly finite element analysis results, puttingforward some corresponding improvement schemes. Then improving these schemes forfinite element analysis, and getting the best scheme to improve thrust rod assembly.Finally, basing on the best improvement scheme about the thrust rod assembly, applyingfinite element analysis results to predict the maximum value of fatigue life about parts.The fatigue life of thrust rod assembly directly affects the heavy commercial vehicletransportation safety, the contents of this paper including optimizing the thrust rod assemblyand calculating the corresponding improvement scheme fatigue lifetime. It will provide thetheory basis and the design process for future research about thrust rod assembly.