Contact Analysis Of Gear System Based On Parametric Design

Gear transmission is used most extensively in mechanical transmission. It has the advantages of wide range power, high transmission efficiency, accurate drive ratio, long life and safety. With the development of industry and modern science technology, higher request on load-carry capacity of gear transmission system has been put forward, in which the contact strength is an important criterion. At the same time, the development of computer technology has made Finite Element Method (FEM) used widely in the analysis of gear transmission intensity. The reason is that FEM can deal with mechanical boundary condition very well, and can provide an exact stress analysis for gear transmission system.As we know, the profiles of involute gears are mainly determined by some basic parameters, which bring the gear modeling into repetition. For the purpose of increasing working efficiency, it's necessary to realize parametric modeling for gear contact analysis.By using the parametric design function of I-DEAS software, programs on automatically modeling of cylinder involute spur gears, cylinder involute helical gears and straight involute bevel gears were designed based on some special language of I-DEAS software. Running these program files in I-DEAS and inputting parameters such as gear number, modulus, pressure angle, helix angle, change position, modulus of elasticity and position ratio of gear material, the load on driven gear, then the I-DEAS software can complete the work of modeling, meshing, applying boundary condition automatically. Analyzing gear contact, the user can observe the result in post processing model to get the stress of gear.With this method, the designer could get useful information on gear contact intensity to guide design.