Hydrodynamic lubrication in line contacts improved by the boundary slippage

The present paper proposes three types of the boundary slippage augmentations in hydrodynamic lubricated line contacts for improving the load-carrying capacity but reducing the friction coefficient. One augmentation is at the slower moving contact surface, the second augmentation is at the faster moving contact surface, and the third is at both of the contact surfaces. They are respectively suitable for different operating conditions. The analysis was respectively carried out for the load-carrying capacity and the friction coefficient of hydrodynamic lubricated line contacts augmented with these three types of boundary slippage. The obtained results were compared with those for conventional hydrodynamic lubricated line contacts ( without artificial introduction of the boundary slippage) for the same operating conditions. It was shown that in certain operating conditions these three types of the boundary slippage augmentations can respectively significantly increase the load-carrying capacity but reduce the friction coefficient of the contact. The potential application values of the proposed boundary slippage augmentations are evident for reducing the energy loss and the temperature rise as well as for improving the anti-scuffing ability of the contact.