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该文分析了渐开线外啮合斜齿轮流量计出现困油现象的根本原因,并且从理论上推导出消除困油现象的重合度公式,最终得出渐开线外啮合圆柱斜齿轮流量计不发生困油现象的临界螺旋角.按照临界条件建立流量计模型,并利用PumpLinx仿真软件对渐开线外啮合圆柱直齿轮流量计和渐开线外啮合圆柱斜齿轮流量计的流量脉动进行比较,说明渐开线外啮合圆柱斜齿轮流量计在减少流量脉动性上的优越性.“,”The paper analyzes the involute external gear cylindrical helical gear flowmeter appear the root cause of the phenomenon of trapped oil,and deduces to the formula of contact ratio in theory to eliminate the phenomenon of trapped oil, finally it is concluded that the critical helix Angle of involute external gear cylindrical helical gear flowmeter when without the phenomenon of trapped oil. Flowmeter model is established according to the critical condition,and take advantage of the PumpLinx simulation software to compare the flow pulsation of involute external gear cylindrical spur gear flowmeter with involute external gear cylindrical helical gear flowmeter, to introduce the superiority of involute external gear cylindrical helical gear flowmeter in reducing of the flow pulsation.