Based on the theory of gear geometry and dynamics

the dynamic calculation model of asymmetric involute spur gear is established

and the programming is produced by Matlab

the dynamic characteristic of asymmetric involute spur gears is studied.The results show that the meshing stiffness of asymmetric gear is higher than symmetry gear

but the dynamic factor of asymmetric gear is less than symmetry gear.With the increase of pressure angle of gear

the meshing gear contact ratio and transmission error are reduced

and the dynamic factor is reduced.With the increase of tooth root distance and pressure angle

the bending stress of gear tooth is reduced.