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本文对范成法加工的渐开线圆柱齿轮，在单对齿啮合受载时，按轮齿危险截面形状（分平截面法和折截面法）、加工方法（分齿条刀类和插齿刀类），给出四组齿形系数的计算式。此式既可计算标准（或非标准）齿轮齿顶受载时的齿形系数，又可计算标准（或非标准）齿轮齿廓任意点受载时的齿形系数，还可计算具有非标准齿廓参数的渐开线齿轮任意点受载的齿形系数，为精确计算轮齿齿根弯曲强度提供了依据。
In this paper, Fan Chengfa processed involute cylindrical gear, when a single pair of teeth meshed with the load, according to the dangerous cross-sectional shape of the gear (flat section method and the cross-section method), processing methods ), Gives four sets of tooth form factor formula. This formula can calculate the standard (or non-standard) gear tooth top load tooth profile coefficient, but also calculate the standard (or non-standard) gear tooth profile at any point load factor coefficient can also be calculated with non-standard Tooth profile parameters of the involute gear loaded at any point of the toothed coefficient, to provide a precise basis for calculating the bending strength of the gear tooth root.