为了分析柱塞副偏心状态对油膜特性的影响，采用动压支承理论和数值模拟方法，研究在不同柱塞腔压力和缸体转速时柱塞副油膜形态及其变化规律，采用寿命试验台测试液压泵试验件并与理论结果进行对比验证． 结果表明:柱塞偏心状态下，柱塞副油膜出现最小厚度值，油膜内部压力高于柱塞腔压力;压油区油膜厚度随压力增加而线性增加，随转速增加而减小，但转速越大，油膜厚度减少量越小，柱塞转过 90°时油膜厚度达到最小值;吸油区最小油膜厚度几乎不随转速变化，且吸油区最小油膜厚度小于压油区油膜厚度;柱塞副最小油膜厚度出现位置与斜盘摩擦力方向一致．

In order to analyze the influence of the radial micro-motion of piston-cylinder interface on the oil charac- teristic,based on the theory of dynamic pressure supporting,the oil shape in the piston-cylinder interface with dif- ferent pressure and rotating speeds as well as its change is simulated.Then,a hydraulic pump is tested by using a service life test bench,and the test results are compared with the theoretical ones.The results show that (1) with the radial micro-motion,there exists a minimum oil thickness,and the pressure in the interface is higher than that in the cylinder; (2) the thickness in the pressing area linearly increases with the increase of pressure; (3) as the rotating speed increases,the thickness in the pressing area decreases and the decrease tends to become smaller; (4) when the turning angle is 90°,the thickness reach the minimum value; (5) in the absorbing area,the mini- mum oil thickness is irrelevant to the rotating speed,and it is smaller than that in the pressing area; and (6) the position of the minimum oil thickness is consistent with the direction of the centrifugal force.