A Method for Estimating Hysteresis of Automatic Tensioner and Analysis of Hysteresis Variations with Tensioner Parameters

The automatic tensioner is one of the important parts of the front end accessory drive system of the automobile engine. The tensioner uses the relative slip of the friction pair to generate friction torque, which makes its own system have hysteresis characteristics, so that it can automatically control the tension of the belt in the attachment system and improve the NVH performance of the attachment system. This paper takes the automatic tensioner of an engine front end accessory drive system as the research object, and establishes an analytical model and a finite element simulation model for the calculation of the hysteresis characteristics of the tensioner. The hysteresis characteristic test of the tensioner was carried out to verify the correctness of the analytical model and the finite element model, the error between the calculation results and the test results was analyzed, the proportions of the three friction pairs were compared, and the factors affecting the performance of the tensioner were determined. Key parameters, analyzed the effect of key parameters on the working torque and damping ratio of the tensioner. The method proposed in this paper takes into account the change of the initial gap and contact state between the tensioner spring and the damping bracket, and has stronger versatility. It can effectively predict the hysteresis characteristics of the automatic tensioner, and has practical engineering significance for the design and development of the tensioner.