高速无杆气缸作动器密封圈润滑性能分析

Lubrication performance analysis of high-speed rod-less cylinder seal

针对高速无杆气缸作动器密封圈润滑状态随滑动速度变化的特点,提出直线滑动密封"临界速度"概念,分析作动器密封圈润滑性能.建立密封圈润滑状态二维高效分析模型,在全速范围内,对"临界速度"进行初步定位,并揭示预压缩量、唇角和温度对润滑性能的影响机理.考虑摩擦生热和热流分配原则,获得接触域油膜温度边界;结合Gauss分布函数和点云法,构建油膜三维微观计算域;建立密封圈润滑状态三维精确分析模型,对"临界速度"进行精确定位,揭示纹理特征对润滑性能的影响机理.研究结果表明:预压缩量越大、唇角越大、润滑油温度越高,临界速度越高;密封圈三维微观形貌对临界速度的影响明显,相同条件下具有各向同性的微观表面更容易形成完全润滑.

The concept of critical speed＇was proposed for the lubrication status varying with sliding speed.The two-dimensioned efficient analysis models were established to analyze the lubrication performance of high-speed rod-less cylinder seal ring.The primary mapping of‘critical speed＇was determined in whole speed range and the influence factors such as compression ratios,seal angle and the temperature were revealed.The oil temperature boundary was obtained by calculating friction heat and the coefficient of heat partition.The oil＇s three-dimensional micro-model based on Gauss distribution function and exponential autocorrelation function was onstructed to describe the geometry morphology of real rough surface.The three-dimensional precision analysis model was established and the precision location of‘critical speed＇was got.The influence of seal surface texture an lubrication performance was investigated.Results show that the‘critical speed＇increases with the compression ratios,seal angle and the temperature increasing The influence for ‘critical speed＇is obvious.The isotropic micro-surface texture is more easily to form hydrodynamic lubrication.