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渐开线直齿圆柱齿轮的公法线长度的计算,大家都熟悉压力角为20°和14(1/2)°的计算公式,而对于压力角为15°,17(1/2)°,25°的渐开线直齿圆柱齿轮的公法线长度的计算,却很陌生,更难由一般表格查到。为此,本文从原理上推导后,使读者可直接将各种压力角数值按公式代入,进行计算。一、模数制直齿圆柱齿轮从图1可知,跨齿数n、压力角a_0、齿数z、周节t、分度圆半径R的关系,可分别表示为:
The calculation of the common normal length of an involute spur gear is familiar to everyone with the formulas for pressure angles of 20 ° and 14 ° (1/2) °, and for pressure angles of 15 °, 17 (1/2) °, The calculation of the common normal length of a 25 ° involute spur gear is unfamiliar and harder to find by the general form. To this end, this article derives from the principle, so that readers can directly enter the value of various pressure angle values, calculated. First, the modular straight spur gear Figure 1 shows that the number of cross-teeth n, pressure angle a_0, the number of teeth z, weeks t, graduation circle radius R relationship can be expressed as: