Finite Element Analysis And Structure Optimization Of A Tractor’s Balance Shaft Bracket

The balanced suspension system is the key component of tractor chassis.The quality of the chassis plays an important role in the lightweight effect of the whole vehicle.The balance shaft bracket is an important component of the balance suspension system.Due to the heavy vehicle load and complex road conditions,the parts quality and structural strength of the balance shaft assembly are required to be high.Therefore,it is necessary to carry out structural design work on the balance shaft bracket.In this paper,a heavy-duty tractor balance shaft bracket is taken as the research object,the balance shaft assembly of the integral balance suspension system is analyzed by finite element method,and the structure of the balance shaft bracket is optimized to realize the lightweight demand.The specific work is as follows:Firstly,the finite element model of balance shaft assembly was established and statics analysis was carried out.The three-dimensional model of balance shaft assembly was created in CATIA,and the finite element model of balance shaft assembly was established in Hyper Mesh pre-processing platform.According to the actual road working condition of tractor and static balance working condition as reference,three typical working conditions were established,which were unilateral bounce,full load braking and full load turning.In the Hyper Works Opti Struct solver,the finite element model of the balance shaft assembly was checked for static balance working conditions and static analysis under three typical working conditions,and the displacement and stress distribution laws of the original balance shaft support under each working condition were obtained.Secondly,the dynamic characteristics and dynamic strength of the balance shaft support structure was explored.The constrained modal analysis of the balance shaft assembly structure was carried out.The dynamic load impact condition of the balance shaft assembly was set in the RADIOSS solver.The performance of the support structure under the impact of vertical dynamic load was investigated,and the balance shaft assembly structure was compared with the actual failure situation.Then,the topology optimization model of the scaffold was established in the software solid Thinking inspire.The variable density method of topology optimization was used to optimize the three-dimensional topology under three typical working conditions of unilateral bounce,full-load braking,and full-load turning,with the maximum stiffness of support as the optimization objective and the volume ratio of design space as the constraint condition.The optimal distribution of support material was obtained.Finally,according to the results of finite element analysis and the material distribution after topology optimization,the lightweight design scheme of the original support structure was proposed,and the new support structure was checked by finite element method.The results show that the optimized support structure not only reduces the weight by nearly 12% under the conditions of the support strength,stiffness and impact,but also improves the use efficiency of the material,and the result is improved compared with the original structure performance,and it is safe under various working conditions.The coefficients have been improved,and a good lightweight effect has been achieved.The simulation verifies the effectiveness and feasibility of the optimization scheme.