直线共轭内啮合齿轮泵困油的参数影响分析

Analysis of the Effect of Parameter on Trapping Oil of Straight Conjugate Internal Gear Pump

应用切线极坐标法分析了直线共轭内啮合齿轮副的啮合过程,基于啮合角函数,推导得出便于直接应用的直线共轭内啮合齿轮泵的困油容积变化量计算公式,利用UG建模测量验证了公式的正确性,并在此基础上应用MATLAB编程分析了齿轮基本参数对NBX3型直线共轭内啮合齿轮泵困油特性的影响,得出结论:为减小困油的不利影响,在NBX3型泵的参数设计时,应在参数取值范围内选取较大的内齿圈齿顶圆半径、直齿轮齿形半角、节圆弧齿厚对应的圆心角及较小的直齿轮齿顶圆半径。

The gear pair meshing process of the straight conjugate internal gear pump is analyzed, by using tangent polar coordinate method, based on the meshing angle function, the formulation for calculating trapping volume are deduced, and it is affirmed through UG modeling measurement. Then, by using MATLAB programming, the effect of the gear basic parameters on trapping oil char- acteristic of NBX3 pump is analyzed, got the following conclusions： the bigger addendum circle radius of internal gear, tooth profile half--angle, arc tooth thichness of pitch circle angle and smaller addendum circle radius of straight gear is useful to decreasing the adverse effect of trapping oil phenomenon.