Abstract
AbstractPlanetary drives with small teeth number difference are key components widely used for transmitting significant power. In general, these components are designed with short tooth depth to avoid the interference of addendum, which may have significant effect on contact conditions and lubrication characteristics. In the present study, a modified mixed elastohydrodynamic lubrication model is employed to analyse the lubrication performance in tooth pairs with consideration of real geometry profile (short tooth depth) and 3D machined roughness. Numerous sets of cases from meshing in to meshing out have been analysed under a wide range of operating conditions to study the tribological behaviour. Obtained results suggest that the lubrication and friction behaviours are much worse especially at meshing out points than those ignoring the influence of real tooth geometry. The modified elastohydrodynamic lubrication model is compared with finite element analysis results which indicate that it is able to handle practical cases in which the real contact width is much shorter than Hertzian contact width and can be employed for the analysis and design of planetary drives with small teeth number difference.
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