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简介了复合齿轮泵结构原理并约定了有关概念；根据齿轮泵流量特性与啮合点位移基础理论，分析了中心轮和惰轮齿数特性对复合齿轮泵诸啮合点及位移影响；进一步分四种情况研究了啮合点运动规律和泵的流量特性，推导了流量脉动率公式，得出有关结论，供进一步研究参考
According to the principle of gear pump flow characteristics and meshing point displacement, the influence of the number of teeth of idler gear and center gear on the meshing point and displacement of compound gear pump is analyzed. In further four cases The law of the movement of the meshing point and the flow characteristics of the pump were studied. The formula of the rate of flow pulsation was deduced and the conclusion was drawn for further reference