The contact process ofin the movement process is a highly nonlinear problem, and its contact strength is affected by many factors, such as the impact of helical gear caused by assembly error in the actual work of helical gear pair and the meshing impact caused by bending and torsional deformation of helical gear shaft in the meshing process. These impacts will increase the contact stress of helical gear, and the phenomenon of stress concentration is serious. In this chapter, ANSYS and ANSYS / LS-DYNA software will be used to study the influence of different backlash and helical gear shaft stiffness on the contact stress of helical gear. The calculation results have a certain reference value for the actual production and assembly of helical gear and the strength design of helical gear.
The effects of different backlash and helical gear shaft stiffness on the dynamic contact stress of helical gear are compared. The backlash caused by assembly error is easy to cause the problem of impact stress. The influence of different backlash on the dynamic contact stress of helical gear is compared and analyzed by using ANSYS / LS-DYNA software, and the variation law of the impact stress on the meshing surface of gear teeth increases with the increase of backlash is obtained. Because the bending deformation of the helical gear shaft in the meshing process is easy to cause the increase of impact vibration, the influence of the stiffness of the support shaft on the dynamic contact stress of the helical gear is studied by using ANSYS / LS-DYNA software. It is concluded that the helical gear shaft is easy to produce bending deformation in the meshing process of the helical gear, which is easy to cause the meshing instability of the helical gear and produce large impact stress.