Effects of Surface Texture on Tribological Properties of Hydrodynamic Journal Bearing

In order to investigated the effect of surface texture on tribological properties of hydrodynamic journal bearing, friction and wear tester based on self-developed, the tribological properties of hydrodynamic journal bearing with surface texture machined by BY-BDB three-dimensional fiber laser marking machine were studied. The surface morphology and friction and wear status of the hydrodynamic journal bearing after friction and wear test were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Results show that laser processing can cause surface hardening and the contents of C and O elements increase by 31. 1% and 7. 9% respectively. The wearing capacity and friction coefficient under different textured parameters (textured area ratios S-p and texture aspect ratios beta) and working conditions (rotational speeds and loads) show a trend of decreasing first and then increasing. And surface texture can improve antifriction of hydrodynamic journal bearing by more than 23%. Furthermore, it is found that friction and wear mechanism of hydrodynamic journal bearing is abrasive wear and adhesive wear, while the mechanism of surface texture anti-friction is to improve wear resistance, store abrasive particles and forme secondary hydrodynamic lubrication.