The design methods and calculation equation of the helical elliptical gears are studied.Then a helical elliptical gears CAD system is built through secondary development of SolidWorks software by using VB 6.0which is a visual and object-oriented program language.By using this system

the 3Dparametric modeling and dynamic meshing simulation of helical elliptical gears is achieved and these problems such as complex calculations and 3Ddesign are solved.The specific process

composition

function of main modules and the realization of the system are introduced

and finally

the functionality of this CAD system is verified by an example of a pair of three order helical elliptical gear3Dmodeling and dynamic meshing simulation.