Finite Element Simulation Analysis And Optimization Design Of Synchronizer Shifting Performance

Mechanical transmissions are favored by enterprises and consumers because of their simple structure,reliable operation and low cost.As the core component of the mechanical transmission,the synchronizer has a major impact on shift performance and driving comfort.In the subject,a single-cone-face-locked-ring synchronizer is studied.In view of the complex structure of the synchronizer and the short shifting time,it is difficult to obtain the influence of each parameter on the shifting performance through experiments.The virtual simulation analysis technique is adopted.The combination of dynamic analysis,Finite Element Method and structural optimized design studies the design parameters of the car synchronizer to achieve the purpose of improving the shifting performance of the synchronizer.The subject mainly studies from the following four aspects:(1)According to the structure and working principle of the synchronizer,the synchronization process is analyzed in detail,and the mathematical model of the synchronization process is established,which provides a theoretical basis for the subsequent simulation analysis.(2)The dynamics model of the shifting process of the synchronizer is established by using ADAMS software.The principle of the influence of shifting force,cone friction coefficient,input engine speed and input moment of inertia on the shift performance is studied.The fork displacement is extracted as the boundary condition of the finite element analysis.(3)The dynamic finite element model of the synchronizer is established by using the ABAQUS software,and the parameters obtained by dynamic analysis are used as boundary conditions.The effects of parameters such as shifting force,cone friction coefficient,input engine speed and input moment of inertia on stress and deformation of key components are analyzed.(4)For the insufficient stiffness of the fork,the OptiStruct software is used to optimize the design of the fork stiffness,and the optimized fork is compared with the result of the fork before optimization to verify the effectiveness of the optimi zation result.The research results show that the parameters such as shifting force,cone friction coefficient,input engine speed and input moment of inertia not only affects the synchronization time,shifting impact force and shifting sliding friction work,but also affects the contact stress and deformation of the component.By optimizing the design,the shifting performance is improved and the contact stress of the components is reduced.According to the above research results,the combination of dynamic analysis,finite element analysis and structural optimization design improves the shift performance of the synchronizer.