为了更好地预测高速下外啮合齿轮泵的困油程度,以及高速离心作用对困油的影响.在现有研究成果的基础上,简述了困油压力仿真的静、动态模型.利用龙格-库塔法的迭代运算,获得高速下困油压力和齿轮副振动在一个困油周期内的动态仿真结果,且就困油压力与泵齿轮副动力学特性的耦合性进行了分析.结果表明,高速下泵的困油压力比较严重:困油压力越大,齿轮副的振动越剧烈；高速离心作用对困油压力的缓解效果明显;齿侧间隙和卸荷槽的共同作用能使困油压力大幅降低;高速下应尽量通过卸荷槽结构的创新设计来降低困油压力和减缓振动.该研究为下一步高速下外啮合齿轮泵的开发提供理论指导.%To better predict the degree of trapping oil in external gear pump under high-speed, and the influence of high speed centrifugal effect on the trapped oil, the static and dynamic models used for trapped oil pressure simulation were reviewed. The iterative operation based on Runge-Kutta method was used for simulation on trapped oil pressure and gear vibration in a trapped oil cycle under higher speed, and the coupling of both trapped oil pressure and gear dynamics was analyzed. The results showed that trapped oil pressure was severe under higher speed. The greater the trapped oil pressure, the more intense the gear vibration. The effect of high-speed centrifugation to alleviate trapped oil pressure was significant. The combined unloading effect of unloading relief and backlash could reduce trapped oil pressure, and innovative structure design of unloading relief might be necessary to reduce trapped oil pressure and slow down gear vibration. The research can provide a theoretical guidance for development of higher speed external gear pumps.
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