The average efficiency formula of helical gear meshing transmission is derived by using the integral method, and the average efficiency formula of helical gear meshing is obtained as follows:
Where: K – coefficient of z1, h * an, B; R1 – about h * an, mn, z1, α t. Function of B; R2 – about mn, h * an, z1, α t. Function of B.
It can be seen from the formula that the meshing efficiency of the helical gear is related to the number of teeth of the driving gear z1, the number of teeth of the driven gear z2, the transmission ratio i, and the helix angle β， Normal modulus Mn, tooth width B, normal pressure angle α n. The normal addendum height coefficient h * an is related to the friction coefficient f.