Formula of common normal line for gear calculation
The maximum tooth thickness and the minimum tooth thickness shown by the drawings are to be calculated separately, and the values of the two normal lines are obtained, which constitute the two limit values of the length of the common law lineThe above calculation method can be applied to an involute gear of 20 degree of pressure angle, whether or not it is changed
Normal line W, W= (k * pi * m + S + m * Z * cos20. 0.014904384), where m is the modulus gear; gear tooth thickness is S. The tooth thickness of S,
Tooth number K, the results of K = Alpha x Z / 180+0.5, as integer. Alpha, gear pressure angle, are generally 20.Z, the number of gear teeth. In the calculation of normal line W, parameter (K-1), you can directly enter the digital K, k= (K-1).
