根据工厂的生产条件,在一般用途齿轮联轴器的内外齿套工作图上,往往需要注明公法线长度。5006—55《一般用途齿轮联轴器》只规定了公法线长度公差,没有给出公法线长度。因为在文献中没有现成的公法线长度计算公式,所以,外齿轴套(指标土)和内齿圈(指标2)的公法线长度可分别按下式计算 According to the factory’s production conditions, the general purpose gear coupling inner and outer gear sleeve work diagram, often need to indicate the length of the common law. 5006-55 “General Purpose Gear Coupling” only provides for the length of the common law tolerance, did not give the length of the common law. Because there is no established formula for calculating the length of the common normal in the literature, the length of the common normal for the outer sleeve (index soil) and the ring gear (index 2) can be calculated as follows