Three-dimensional bending finite element model and stress analysis of helical gear

In order to compute the bending stress of helical gear with finite element method,a determining method for the engaging contact lines of helical gear was proposed according to the engaging principle of helical gear.The program module for automatic three-dimensional bending finite element modeling and stress analysis of heliacal gear was developed with APDL in ANSYS.The helical gear in a truck transmission was selcted as the research object,and its three-dimensional bending finite element model was established.The results obtained by three-dimensional finite element analysis of helical gear were comparied with the gear carrying canpacity in ISO standard.It is found that the finite element model of heliacal gear can not only reflect exactly the three-dimensional stress distribution of helical gear,but also solve accurately the tooth root stress at different engaging points of helical gear.