The coordinate systems for the processing and driving of the helical pinion and the face gear were established

the tooth face equations of face gear and the helical pinion were deduced

while the tooth faces were simulated for visualization.Tooth contact analysis was conducted for the alignment error of the driving system.The tooth contact path and the transmission error of the face gear drive were computed through tooth contact analysis.Besides

different tooth faces and the tooth contact paths between the dextral face gear and the sinistral face gear were investigated in the paper.At last

the method of restoring the shift of contact path through axial displacement of the face gear was studied.