Abstract: In this paper, transient EHL equations considering vibration effects of gear transmission system and its evaluation have been given. In research of transient EHL, transient effects of variable load, variable curvature radius and variable rolling veloiety are combined and have been used to lubrication problem of involute spur gears. Where, the variable load is the dynamic load caused by vibration of gear transmission system which is solved by numerical method with a model of eight-masses and sixteen-degrees of freedom. The vibrant-transient EHL problem of each meshing point along the meshing line is considered as a time procedure and the full numerical solution has been made. One example of the numerical solution is given. The pressure spike and the minimum film thickness varying along the meshing line, as well as the pressure distribution and film shape of seven special meshing points are shown in figures.

Key words: EHL, Gear transmission, Transient effect, Vibration