A new modification method for face gear was proposed as the pinion double crowned.The derivations of surface equations of tooth modified pinion and face-gear were obtained respectively.The meshing performance investigation of the local conjugate face-gear pair was presented after the tooth contact anlysis was achieved taking the assembly errors into consideration.Finally
the calculated examples show that it enables the transmission errors to form a parabolic function
and enables the direction of contact path and the magnitude of transmission errors to get good control while the factors are pre-designed.The meshing performance of the local conjugate gear pair can obtain an anticipating controllability by using this method
which is quite important for restraining the edge contact