叶片式液压摆动马达的非线性泄漏分析

摆叶马达是一种高精度的液压执行机构，内部密封结构较复杂.针对摆叶马达的密封结构特性，分析了它的泄漏组成，提出了它的非线性泄漏计算模型，并得出影响泄漏的关键因素和减小泄漏需采取的措施.在工程实际中，摆叶马达存在密封失效的问题，通过理论分析得出了密封失效的原因在于轴肩密封，轴肩密封中O形圈的预压缩量决定了密封失效的临界压力.摆叶马达泄漏量的增大不仅仅与密封压力和速度有关，而且与马达叶片转角也有关系，它的非线性模型也为液压伺服系统提供了理论依据.

Nonlinear leakage model of rotary vane actuator

Rotary vane actuator is a high-precision actuating mechanism. Internal structure of seals is more complex than the other actuators. Nonlinear leakage model of rotary vane actuator was put forward based on the analysis of the character of seals of rotary vane actuator. Rotary vane actuator's total leakage consists of three parts. Each part of leakage was analyzed. The key factors of leakage were found. The method of decrease leakage of rotary vane actuator was applied via analysis. In operation, the problem of seal failure existed. The reason of seal failure is about shaft shoulder seals. Increase the compression quantity of O-ring of shaft shoulder seals could prevent seal failure. Leakage of rotary vane actuator not only related to load pressure and velocity of actuator, but related to the rotary angle of vane. The nonlinear model provided the theory proof for electro-hydraulic servo system for rotary vane actuator.