According to the volume oil formula of the straight gear pump, the volume oil formula of the helical gear pump is got and the helix Angle no trapping is found.

利用直齿齿轮泵的困油容积变化公式，求出了斜齿齿轮泵的困油容积变化公式，得到了斜齿齿轮泵不发生困油的螺旋角。

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The gear involute master and helix master are measurement standards and usually used to calibrate the involute and helix parameters of gear equipments.

齿轮渐开线样板和螺旋线样板是齿轮参数的标准计量器具，分别用于齿轮仪器渐开线、螺旋线参数的校准。

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The way of calculating the parameters of modulus, pressure angle and helix angle of the gear masters that are used to calibrate gear instruments is in detail in this paper.

本文详细介绍了用于齿轮仪器校准的齿轮样板模数、压力角、螺旋角等参数计算方法。

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