Abstract
Bearings are key components in high-speed and high-precision machine tools. Temperature rise and stability are significant for a rotor–bearing system in a high-speed spindle. This study proposes a water-lubricated hybrid bearing with circumferential grooves and stepped recesses to lower the temperature rise and improve bearing stability. A bulk-flow thermohydrodynamic model is developed to predict the static performance and stability of the bearing. A comparison of the results confirms the validity of the model and the improved characteristics of the hybrid bearing. A sensitivity analysis is conducted to quantify the influence of recess sizes on bearing performance. The discussion defines the key parameters of bearing performance and provides a useful guide for the optimal design of hybrid bearings.
ACKNOWLEDGEMENTS
We gratefully acknowledge the National Basic Research Program of China (973 Program Nos. 2009CB724404 and 2011CB706601) for their financial support of this research.