To enhance the meshing performance of face gear drives

based on the generation process of grinding of face gear and three-dimensional topology modification theory of pinion

the expressions of tooth face equations of face gear drives were derived respectively. The influence of 5 modification coefficients on the meshing performance were analyzed

and theory for meshing performance pre-controlled was proposed

which can be realized by optimizing the modification coefficients. The three-dimensional topology modification theory presented was verified by the experimental results.The results show that: the modification coefficient of tooth profile is the major pre-control parameters which affect the width of contact area along the direction of tooth height obviously. The modification parabolic coefficient of tooth length affect the width of contact area along the direction of tooth length

and different values of these two parameters can significantly affects the tilt of contact line and the shape and the size of contact area.Contact area and transmission error can be pre-controlled effectively by three-dimensional topology modification theory of pinion and the sensitivity of the installation error of face gear drives can be reduced effectively.