Due to the characteristics of modification coefficient change along the axial in variable tooth thickness gears

the contact angle

cone angle

contact ratio

pressure angle of addendum circle in different normal section

sliding rate and other parameters are deviated from common involute meshing pairs

and the meshing efficiency calculation formula is also different with the common involute meshing pairs.Calculation characteristics and influencing factors of conical involute gears

such as the influence of the modification coefficient on the contact ratio and mating efficiency in conical involute gears are analyzed.Based on this

a new method for calculating the efficiency is proposed.Calculation and analysis of meshing efficiency are carried out by some examples

and the impact factors of cone angle

rack tool inclining angle and transverse contact angle to meshing efficiency are analyzed.