Abstract
Based on the analysis of the structural characteristics of the internal meshing gear pump with multi-output, the main leakage ways in the gear pump are summarized. By establishing the mathematical formula of leakage, the general formula of the total leakage of the gear pump under three working modes is obtained, and the volume efficiency of the pump is calculated. It is concluded that the volume efficiency of the internal meshing gear pump with multi output is the highest when the internal pump is used alone, and the volume efficiency of the external pump alone is the lowest. The structure of internal gear pump with multi output is improved to reduce the leakage and is verified via experiments. The experimental results show that the volumetric efficiency of the pump is consistent with the analysis results, that is, the volume efficiency decreases with the increasing of load pressure of pump.
Highlights
It is concluded that the volume efficiency of the internal meshing gear pump with multi output is the highest when the internal pump is used alone, and the volume efficiency of the external pump a⁃ lone is the lowest
The experimental results show that the volumetric efficiency of the pump is consistent with the analysis results, that is, the volume efficiency decreases with the increasing of load pressure of pump
The structure of internal gear pump with multi output is improved to reduce the leakage and is verified via experiments
Summary
齿轮端面与浮动侧板内侧间隙 / m;θ1,θ2 分别为共 齿轮外齿、大齿圈高压腔包络角 / rad;rf1,rf2 分别为 共齿轮、大齿圈齿根圆半径 / m;rz1,rz2 分别为共齿轮 轴外圈、大齿圈外缘半径 / m;μ 为液压油的动力黏 度 / (N·S·m-2)。 顶隙系数 c∗ 压力角 α / rad 齿宽 B / mm 小齿轮处于过渡区齿数 齿顶高系数 ha∗ 顶隙系数 c∗ 压力角 α / rad 齿宽 B / mm 假定 μ = 3 × 102 Pa·s;Δp = 6 MPa;n = 1 500 r / min;内、外泵的轴向间隙与径向间隙均为 0.01 mm。 则多输 出内啮合齿轮泵的理论泄漏量如图表 4
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