中文摘要：

变间隙密封液压缸的核心部位是活塞唇边,间隙的变化主要体现在活塞唇边变形上。应用弹性力学中悬臂梁结构的应力函数解对唇边变形进行理论分析,推导出了唇边变形公式。利用有限元软件仿真模拟不同的唇边结构在不同压力工况下的变形情况,找到了变间隙密封活塞唇边变形特点和影响因素。比较了实验测试变间隙密封液压缸内泄漏量与理论变形曲线计算的泄漏量,结果显示两者误差在允许范围内,证实了仿真的正确性。

英文摘要：

The piston lip was the key point of the variable clearance sealing hydraulic cylinder. Therefore, the changes of clearance mainly reflected on the deformations of the piston lip. The stress function of cantilever beam structure in elastic mechanics was applied in this situation to analyze the deformations of the lip, and the deformation formula was deduced. Meanwhile ANSYS was used to simulate deformations of different lip structures in various working pressures. The characteristics and the influencing factors of variable clearance sealing piston lip deformations were found in the simulations. Compared the inner leakages of variable clearance sealing cylinder from tests with the leakages from calculations of theoretic deformation curves, results show the error is within the allowable ranges, and the simulations are validated to be correct.