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分析了齿侧间隙很小时直齿轮泵和斜齿轮泵困油容积的变化规律，得出困油容积变化为二次抛物线的定量结论。设计了在此困油情况下齿轮泵消除困油的导压槽
The change law of the trapped oil volume of spur gear pump and helical gear pump when the flank clearance is very small is analyzed. The conclusion that the volume of trapped oil changes to the second parabola is obtained. Designed in this case of oil trap gear pump to eliminate the trapped oil pressure guide groove