Based on the elasto-hydrodynamic lubrication theory, a 2-degree-of-freedom nonlinear dynamic model of helical gears\nwith double-sided film is proposed, in which the minimum film thickness behaves as a function of load parameters, lubricant\nparameters, and the geometry of the contact. Then, the comparison of the hysteresis loops in different gear models\nshows the soundness of the presented model. Using numerical method, the time evolution of lubricant normal force,\nminimum film thickness, and lubricant stiffness is obtained in order to demonstrate the influence of the driving torque\nand pinion�s velocity. The results obtained in this article can contribute to the root cause for the gear vibration and show\nthat the hydrodynamic flank friction has almost no influence on the gear system.
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