Gear Tooth Root Dynamic Stress Analysis And Structural Optimization Of The Design

The fail of gear transmission will directly affects machine driving motion, and thereby affects the whole production process. Break-off of the gear tooth is the most one of all fail manners. So it is very important for us to exactly and thoroughly study bending stress of gear tooth.In the paper, we-exactly set up gear's 3D model based on gear machining principle using mechanism movement emulation function of Pro/E. It established base of research of dedendum dynamic stress that the gear model with exact transition curve was built.ANSYS/LS-DYNA is explicit dynamics software resolving for contact, collision problem. It can deal with framework figure, boundary condition, load behaviour and all these complicated problems, and it can consider influence of transmission error and friction of tooth surface. So the paper used ANSYS/LS-DYNA to emulate dynamic contact of gear pair, and used driver's continuous running to drive driven's running, consequently emulated gear's dynamic meshing process and got variational rule of dynamic stress of root of tooth within a meshing cycle. The emulation result proves ANSYS/LS-DYNA is new and good tool resolving for dynamic stress of root of tooth.Besides, the paper used exact stress of root of tooth that was resolved as stress constraint condition, and carry out optimum design in the web plate structure. The whole gear's weight reduced to 27.39% under the condition of less than the most equivalent stress of the root of tooth. It greatly saves material and reduces cost. The method that applying finite element technology to optimum design achieves computer aided design (CAD) of parts in deed, and it is the main approach of achieving automatic design of parts.