新月形微织构对金属/橡胶密封副摩擦性能的影响

Effect of crescent micro-texture on tribological properties of metal/rubber sealing pair

采用电液作动器金属/橡胶密封副几何模型和流体润滑理论,建立织构化金属/橡胶密封副动压润滑数值理论模型,通过仿真模拟研究了新月形织构面积密度、分布角度等织构参数和运动速度对密封副动压润滑性能的影响。结果表明:随着织构面积密度和分布角度的增加,油膜承载力均呈先上升后下降的态势,且在织构密度为12.8%和织构角度为90°时,油膜承载力最大,摩擦因数最小。摩擦副之间相对速度对密封副摩擦性能有影响:相对速度增加,油膜承载力增大,摩擦因数减小。新月形微织构能够有效改善金属/橡胶密封副摩擦性能。合理设计新月形织构参数,可以显著提高金属/橡胶密封副的润滑性能,增强耐磨性。

Based on the geometric model of the metal/rubber sealing pair of the electro-hydraulic actuator(EHA)and the theory of fluid lubrication,the numerical theoretical model of the dynamic pressure lubrication of the textured metal/rubber sealing pair is built.By simulation,research is conducted on the effects of texture parameters(area density and distribution angle of the crescent texture)and motion speed on the hydrodynamic lubrication performance of sealing pairs.The results show that:with the increase of the texture area density and distribution angle,the oil film bearing capacity has a tendency to increase first and then decrease.And when the texture density reaches 12.8%and the texture angle 90°,the oil film records its highest bearing capacity while the friction coefficient stands at its lowest point.The relative velocity between the friction pairs has an influence on the friction performance of the sealing pair.along with the increase of the relative velocity,the oil film bearing capacity increases whereas the friction coefficient decreases.The crescent micro-texture can effectively improve the friction performance of the metal/rubber sealing pair,and proper designs of the crescent texture parameters can significantly improve the lubrication performance of the metal/rubber sealing pair and enhance its wear resistance.