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液压齿轮泵是液力自动变速箱的重要组成单元,其为自动换挡系统和润滑冷却系统提供油液。以液力自动变速箱设计为依托,根据径向并联外啮合多齿齿轮泵的结构特点,针对其工作过程中遇到的内部困油现象进行研究,分析形成的原因和解决办法。对齿轮泵进行结构优化设计,提出偏置卸荷槽设计方案,并对其尺寸和位置进行分析,基于CFD对3种不同形式齿轮泵结构工作流场进行对比分析,并搭建试验台架,对优化设计后齿轮泵性能进行试验研究,以验证理论分析的准确性。结果可知,当采用偏置开设卸荷槽时,设计合适的参数可有效改善困油现象,并且齿轮泵的容积效率得到提高;通过试验测试对比容积效率可知,结构优化设计及所搭建数学模型的准确性与可靠性,为此类变速箱齿轮泵的设计提供参考依据。
Hydraulic gear pumps are important components of hydraulic automatic transmissions that provide oil for automatic gear shift systems and lubrication cooling systems. Based on the design of hydraulic automatic gearbox, according to the structural features of radial parallel multi-tooth gear pump with external meshing, the paper studies the internal trapped oil phenomenon encountered in its working process and analyzes the causes and solutions. Based on CFD, the working flow fields of three different types of gear pump structures are compared and analyzed, and the test bench is set up. The design of the offset unloading trough is proposed, and the structure of the gear pump is optimized. After optimization design gear pump performance test research to verify the accuracy of theoretical analysis. The results show that when using offset to set the unloading trough, the design of appropriate parameters can effectively improve the trapped oil phenomenon, and the volumetric efficiency of the gear pump is improved; test volumetric efficiency of the test shows that the structural optimization design and the mathematical model Accuracy and reliability, for the gearbox gear pump design provide a reference.