Abstract:In order to study the mechanism of friction and wear of differential bevel gears,an infinitely variable timevarying elastic hydrodynamic lubrication model for straight bevel gears was established based on the theory of elastic fluid dynamic lubrication.The lubrication conditions of the planetary gears when meshing with the left and right sideshaft gears were studied.The oil film pressure and thickness of the planetary gears under the timevarying effect and at differential conditions were calculated.The left and right side gears under differential operating conditions were studied.The lubricating conditions of the left and right sideshaft gears were studied,and the lubrication characteristics of the left and right sideshaft gears meshing with the planetary gears were compared.The lubrication conditions of the planetary gears under the complicated variable working conditions of the curved driving section were studied.The results show that the film thickness is decreased during the engagement period of the planetary gears under differential conditions,and the relative slipping between the planetary gears and the side gears is intensified.The lubrication characteristics of the planetary gear meshing with the left and right sideshaft gears are different,under the left turning condition, the maximum pressure of the planetary gears meshing with the left sideshaft gear is larger,and the minimum oil film thickness of the planetary gear meshing with the right sideshaft gear is larger.The lubrication characteristics of planetary gear under variable curve driving conditions are different,the pressure is decreased and the film thickness is increased during the transition from the left turn to to the right turn condition.