自动变速箱内置式齿轮泵齿圈断裂的解决方法

Solution of Gear Ring Fracture of the Built-in Gear Pump of Automatic Transmission

为了解决无卸荷槽的内置式齿轮泵的齿圈断裂的问题,利用三维建模软件建立齿轮泵模型,通过FLUENT进行内部流场仿真,得到分别开设无卸荷槽、对称式卸荷槽和偏置式卸荷槽齿轮泵的最高困油压力值,并计算出3种泵的容积效率,验证了采用偏置式卸荷槽的泵能很好地解决困油问题且能提高泵的容积效率。通过计算设计出偏置卸荷槽的偏移位置,并进行样机试验验证。经比较试验结果与仿真结果相近,这为设计内置式齿轮泵提供了参考。

In order to solve the problem that the gear ring fracture of gear pump without unloading groove,by using 3D modeling software,a gear pump model is established. The maximum trapped oil pressure of gear pump with no unloading groove,symmetrical unloading groove and bias type unloading groove are obtained through the internal flow field simulation with FLUENT,then the volumetric efficiency of the three pumps are calculated,the fact that using gear pump with bias type unloading groove can be a good solution to solve the problem of trapped oil and improve volumetric efficiency of the pump is verified. By calculating,the bias position of unloading groove is designed,and the prototype testing verification is carried out. Through comparing,the simulation results are similar to the test results,and a reference for the design of the built- in gear pump is provided.