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在渐开线圆柱齿轮的设计与加工检验过程中,经常要计算公法线长发。迄今,国内、外计算公法线长度的公式中都含有渐开线函数,这给使用普通电子计算器带来不便。利用查表来计算公法线长度不失为一种简捷方法,但在一般参考书中仅当压力角α=20°时,表格比较齐全,而对压力角α为14°30′、15°、17°30′、22°30′、25°及30°的渐开线圆柱齿轮,则无相应表格供查阅。因此,推导出一套适合于用普通电子计算器运算来求公法线长度的简化公式是有重要意
In the design and processing of involute cylindrical gear inspection process, often to calculate the common long hair. So far, involute functions have been included in the formulas for calculating the length of common normals both at home and abroad, which inconveniences the use of ordinary electronic calculators. Using a look-up table to calculate the length of the common normal is a straightforward method, but in the general reference only when the pressure angle α = 20 °, the table is relatively complete, and the pressure angle α 14 ° 30 ’, 15 °, 17 ° 30 ’, 22 ° 30’, 25 ° and 30 ° of involute spur gear, there is no corresponding form for inspection. Therefore, it is important to deduce a set of simplified formulas that are suitable for calculating the length of the common normal using ordinary electronic calculators