The Influence of Surface Micro-texture on Lubrication Performance of Floating Ring Bearing Under Thermal Field Coupling
To improve the lubrication performance of floating ring bearings,micro texture technology was introduced for the radial floating ring bearings,and a thermal fluid lubrication model considering the coupling of surface micro-texture pressure field and temperature field was established.The JFO equation and energy equation were solved simultaneously by finite difference method,and the oil film pressure distribution in the inner and outer layers of floating ring bearing was ob-tained.The effects of concave and convex micro-textures on the ring speed ratio,temperature rise and lubrication perform-ance of floating ring bearing were analyzed.The results show that the concave texture increases the maximum oil film pres-sure of the inner and outer layers of the bearing,reduces the friction power consumption and energy loss,but decreases the bearing capacity of bearing.The convex texture improves the bearing capacity of bearing,reduces the friction coefficient and improves the friction performance,but increases the energy loss.After considering the thermal effect,the ring speed ratio decreases,and the influence of convex texture on the oil film temperature rise is higher than that of concave texture,which reduces the end leakage of the bearing.While concave texture can reduce the friction power consumption of the bearing,and the reduction amplitude increases with the increase of rotating speed.Therefore,the corresponding texture form should be selected according to the different working conditions and lubrication conditions of the floating ring bearing.After taking in-to account the thermal effect,the viscosity of the lubricating oil decreases,the frictional power consumption decreases,the end discharge increases.And with the increase of speed,the change becomes more obvious,indicating that the influence of thermal effect on the lubrication performance of floating ring bearings cannot be ignored.
floating ring bearingmicro-texturethermal effectring speed ratiolubricating property
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