液力自动变速箱内置齿轮泵卸荷槽优化设计

Optimization Design of Relief Grooves in External Gear Pump Inside Hydraulic Automatic Transmission

针对液力自动变速箱内置外啮合液压齿轮泵存在的困油现象进行分析。根据其为中心轮浮动式齿轮泵的特点,理论分析困油现象形成原因和困油过程,基于分析对齿轮泵卸荷槽的基本参数进行设计,并对齿轮泵卸荷槽的开设进行分析,设计齿轮泵偏置卸荷槽的最佳偏移位置。利用Solidworks建立齿轮泵三维模型,基于CFD进一步对比分析了无卸荷槽、对称开设卸荷槽、偏置开设卸荷等三种情况下的齿轮泵三维流场,分析结果表明偏置开设卸荷槽的齿轮泵能明显改善困油区的困油压力,有利于提高齿轮泵的容积效率。研究结果为此类齿轮泵困油现象解决提供参考依据。

To the question that trapped oil in external gear pump inside hydraulic automatic transmission,according to the characteristics that the research gear pump was center wheel gear floating,through the theory analyzed the cause and process of trapped oil phenomenon.Based on the analysis it calculated the confined volume and designed the basic parameters of relief grooves in gear pump.Designed the relief grooves open position in gear pump,and get the best offset.3D model of gear pumps were established by Solidworks,and onalyzed the three-dimensional flow field in three cases which were no relief groove,symmetrical opening relief grooves and offset open relief grooves.The results show that the offset open relief grooves gear pumps can significantly improve the trapped oil pressure trapped oil region,help improve the volumetric efficiency of the gear pump.The results provide a reference for such gear pump to resolve trapped oil phenomena.