Analysis And Optimization Of Hydraulic Belt Tensioner

Taking the automotive engine tensioner in practical applications is often subject to irregular impact force into account,and the work performance of the tensioner is closely related to the response displacement of the tensioner and the response damping force.In order to study the response of the tensioner under the action of the step force,firstly,the Simulink simulation model is established on the basis of the tensioner mathematical model;then,the influence of material parameters and structural design parameters on the response state of tensioner was studied by entering a certain step force,the suggestion of the selection of the relevant parameters of the tensioner is put forward.In order to study the principle and characteristics of the hydraulic tensioner,First of all,the dynamic simulation model of hydraulic tensioner was established in AVL EXCITE through the relationship between the various components of tensioner and related parameters.And the numerical results are compared with the mathematical model to verify the correctness of the model;Simulation results show that the damping force of the tensioner ahead of the characteristics,And found that lead time decreases with the increase of excitation frequency;At last,the principle and characteristics of vibration reduction and energy dissipation of the tensioner are studied.It is found that the vibration amplifying coefficient of tensioner is far less than 1 in the range of 20 Hz ~ 200 Hz,which verifies the good damping performance of the tensioner.In order to improve the dynamic performance of the hydraulic belt tensioner,first of all,based on the actual operating characteristics of the train wheel of a certain bus,the optimum value of the gap of the tensioner is calculated by the weighted average method;Then,the influence of volume change of the oil on the optimization results is obtained by simulation;Finally,considering the variation of the working chamber volume with the length of the ejector rod,the influence of the change of the working chamber on the optimization results is studied.The above researches provide a reference method for parameter optimization of other types of tensioner in the future,and provide theoretical support for parameter selection of tensioner.