Calculation And Experiment Investigation For The Performance Of Spiral Torsion Spring Automatic Tensioner

The spiral torsion spring automatic tensioner can provide stable tension support for the Engine Front End Accessory Drive System(EFEADS),maintain the tension of the belt section stable and reduce tension fluctuations.At present,there are few domestic researches on spiral torsion spring automatic tensioners.The domestic research and design mainly rely on experience,lack the corresponding theoretical basis and performance calculations.Therefore,calculating the spiral torsion spring automatic tensioner by related theoretical analysis and CAE simulation,it can improve the development efficiency of the tensioner and reduce the development cost.In this paper,an EFEADS spiral torsion spring automatic tensioner is taken as the research object,and the following main research contents are carried out:(1)Parameter design of spiral torsion spring automatic tensioner,and design and calculation of spring torque and friction damping torque.Based on the structure and working principle of a certain spiral torsion spring tensioner,the design method of structural parameters of the tensioner is discussed.the mechanical model and friction damping torque of the tensioner spiral torsion spring are analyzed.the design calculation method of the spiral torsion spring and friction damping torque is obtained.(2)Performance test of spiral torsion spring automatic tensioner and finite element analysis of output torque characteristics of the tensioner.In order to verify the reliability of the tensioner performance,the test method of the tensioner performance is proposed.The torque characteristics of the corrugated spring are obtained by testing,and it is used to establish the hysteresis characteristics of the tensioner under quasi-static condition.Then,the finite element model of the spiral torsion spring automatic tensioner was established to solve the problem,while the self-contact and hysteresis characteristics of the spiral torsion spring could not be reflected by the analytical model of the tensioner.The torque characteristics and quasistatic hysteresis characteristics of the coil spring were calculated.The conclusion was drawn that the finite element analysis model could more accurately reflect the output torque characteristics of the tensioner.(3)EFEADS model establishment,test verification and influence factor analysis of spiral torsion spring automatic tensioner.The automatic tensioner model of the spiral torsion spring was established.The motion differential equations of the driving pulleys and the automatic tensioner pulley were established.The EFEADS model was established by combining the tension equation of the multi-wedge belt,the dynamic response was obtained by solving the system equation.The test values were obtained by Rotec testing equipment to verify the validity of the calculation model.Then,the effects of different asymmetric damping factors on the dynamic response of the gear train were analyzed.It is instructive to the research and design of the performance improvement of the spiral torsion spring automatic tensioner.