Transmission principle and geometrical model of eccentric face gear

Noncircular gears acquire wide application in various filed. A novel spatial noncircular gear set comprised of a cylinder gear and an eccentric face gear is presented, which has advantages of light weight, high interchangeability and convenient installation. The transmission mechanism of the eccentric face gear is expounded by kinematical analysis, with the pitch curves and drive ratio deduced. Based on the spatial meshing theory of gears, the mathematical model of the tooth surface of the eccentric face gear is built. Defining the basic design parameters of the eccentric face gear, an kinematical simulation and tooth contact analysis of the eccentric face gear and a cylinder gear are made, which demonstrate the feasibility of the transmission and the correctness of the mathematical model of the eccentric face gear.