An approximate hydrodynamic model of the air-lubricant pumping by spur and helical gears, which makes it possible to predict the compression-expansion process by the meshing teeth, is presented. The simulated pressure patterns correlate well with the experimental evidence obtained from a specific test rig for both spur and helical gears. Finally, it is shown that this pumping phenomenon can generate significant power losses, especially for high-speed applications.
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Diab et al. (2005) studied this question.