Research On Performance And Wear Simulation Of Automatic Tensioner Of Engine Accessory Drive System

As a key component of the engine front-end accessory drive system,the performance of the automatic tensioner plays a vital role in the normal operation of the system.Therefore,the research on the performance of the automatic tensioner can provide reference and basis for the design of the tensioner.With the use of finite element simulation technology,the torque performance and wear law of the tensioner can be simulated more reliably,which is meaningful for the development of the tensioner and the reduction of research and development costs.In this paper,a commonly used spring external support type is used as an example to establish the hysteresis characteristics of the tensioner and the simulation model of the wear of the damping parts for simulation.The main tasks of this paper are:(1)The structure and working principle of the externally supported automatic tensioner are introduced.According to the tensioner torque and the friction damping mechanism of each friction pair,an analytical model of the tensioner hysteresis characteristics is established.In this article,the three-dimensional model of the tensioner is simplified,a finite element simulation model of hysteresis characteristics was established in Abaqus software based on the simplified model,and the hysteresis characteristic simulation curve of the tensioner and the contact state of each component in the tensioner were obtained.And through the tensioner hysteresis characteristic test,the accuracy of the established finite element model of the tensioner is verified.(2)Based on the Archard wear model and according to the wear characteristics of the tensioner damping component,the damping component wear calculation formula is derived.The discretization calculation method is used in the derivation process to facilitate the calculation of the damping component wear depth.The endurance test device of the tensioner is simplified to calculate the speed of the movement of the damping member,and the wear coefficient of the material of the damping member at this speed is obtained.(3)On the basis of the finite element model of the tensioner hysteresis characteristics established above,the Umeshmotion user subroutine used to calculate the wear depth was mobilized in the subsequent analysis step,and the damping element mesh was defined as an ALE adaptive mesh to improve the quality of the mesh.The wear durability test was carried out on three sets of tensioner samples,and the wear depth after the test was measured and compared with the simulation results to verify the accuracy of the wear simulation model.By analyzing the results of the simulation model and the test results,the law of wear of the damping parts of the tensioner is obtained,and a preliminary optimization plan is proposed to optimize the uneven wear of the bushing and the uneven wear of the damping parts.