多沟槽水润滑橡胶合金轴承润滑特性研究

Analysis of Multi-Grooves Water Lubricated Rubber Alloy Bearing Considering the Elastohydrodynamic Lubrication

建立了考虑多沟槽润滑结构和实际工况边界条件的水润滑橡胶合金轴承弹流润滑数学模型,数值计算了有无沟槽以及沟槽半径对润滑性能的影响.计算结果表明:沟槽对水润滑橡胶合金轴承润滑性能影响显著,即在沟槽处膜厚较大,压力较低,而在承载区膜厚较小,压力较高,周向方向上压力分布不连续,并且在最小膜厚处轴向方向的入口和出口附近出现了两个压力峰值;水膜压力和最小膜厚均随沟槽半径的增大而减小;承载能力随偏心率增大而增大,随沟槽半径和过渡圆弧半径的增大而减小;摩擦系数随转速增大而略有增大,随沟槽半径的增大显著增加.

The elastohydrodynamic lubrication mathematical model, considering the multi - grooves effect and actual boundary conditions, was implemented in order to accurately analyze the influences of the multi - grooves and its arc radius on the lubrication performance of the water lubricated rubber alloy bearing. The results show that the grooves had significant effect on the pressure and fihn thickness distributions, the value of the pressure was opposite with the value of the film thickness, and the distributions was corresponding to the grooves geometric distribution in the circumferential direction. Besides, peak pressures were produced nearby the axial inlet and outlet respectively where the minimal film thickness occurred. In addition, the pressure, load capacity and film thickness decreased due to the increase of the groove radius. However, the load - bearing capacity increased with the increase of the eccentricity. The friction coefficient increased with the increase of the rotate speed or groove radius.