According to the speed linkage relationship of non-circular gear,its acceleration equation is deduced and taking the hobbing process of the elliptic gear as an example,its kinematic characteristics are studied according to the velocity and acceleration equations.The velocity and acceleration curves of hob and workpiece in hobbing process of elliptical gears are obtained by using software Matlab and the influence of the order-number and eccentricity on the hobbing kinematic characteristics is analyzed by mea...