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The main objective of this paper is to investigate the influence of tooth friction on the dynamic force of the gearbox. This is one of the most insignificantlyinvestigated aspects of the gearbox work, despite both experimental and theoretical research conducted. For this reason,it is not entirely possible to establish the friction force determining the friction coefficient due to the complexity of the process. Currently,various approaches are taken in calculating dynamic models, among others excludingfriction, Coulomb models, models in which the value of the friction coefficient depends on the sliding velocity,and the application of complex elastohydrodynamic models. Due to such different approaches,it was decided to examine the influence of tooth friction on the dynamic force for the stationary work conditions of the gearbox. Moreover, a new gear tooth friction model was developed, based on the Coulomb model of friction and rolling friction. The results were obtained forfour friction models and, in the fifth case, without including it. Furthermore,the influence of torsional vibration on the friction lever arm was analysed.
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