In order to analyze the dynamic meshing process

the standard involute cylinder gear pair model is built by using elasto-dynamics finite element method.The major principal stress and distribut ion of tooth surface contact stress and tooth root bending stress are calculated

and then the dynamic bending stress time domain history of crit ical posit ion during the meshing process is obtained.The effect of the change of single pair gear meshing and double pair gear meshin on dynamic bending stress is discussed.The effects of the load and speed on gear meshing state

dynamic bending stress are analyzed.The study provides useful theoretical guideline to the design of gear system.