Research Of Contact Stress And Meshing Stiffness Of Gear Based On ANSYS

Gear contact strength is one of the main criterions of gear strength design. The gear stiffness excitation caused by gear elastic deformation generates vibration and noise, when odd and even teeth alternating meshing. Tooth profile error has effects on the gear contact strength and meshing stiffness by changing the tooth profile shape. This paper focused on the impact of the tooth profile error on maximum contact stress and the tooth profile error, gear’s load, gear’s modulus and number of teeth on gear meshing stiffness based on finite element method.The main contents of this thesis were as following:First, the meshing gear finite element modeling with ideal tooth profile and with tooth profile error was built accurately. In the first place, the entity modeling of gear ideal tooth profile was built based on ANSYS’APDL and the ideal tooth profile equation. Second, after the entity modeling of gear was meshed preliminary, the refined gear modeling would be got by the method of refining contact zone finite element modeling based on deleting element of contact zone, rebuilding the entity modeling of contact zone and refining the modeling of contact zone. Finally, based on moving contact zones nodes, the meshing gear finite element modeling with tooth profile error was built.Second, the impact of the tooth profile error on maximum contact stress was studied. it obtained distribution status of maximum contact stress of two gears with ideal tooth profile and without tooth profile error in a meshing cycle. The result showed that maximum contact stress of gear with ideal tooth profile was regular, and tooth profile error changed the distribution status of maximum contact stress of gear with ideal profile.Third, the impact of the tooth profile error, gear’s modulus and number of teeth, gear’s load on gear meshing stiffness was studied. In the first place, distribution status of meshing stiffness of two gears with ideal tooth profile and with tooth profile error in a meshing cycle was obtained by solving gears’deformation, and it was proved that tooth profile error changed the meshing stiffness. In the second place, gear’s modulus did not change meshing stiffness; it reduced the meshing stiffness that gear’s number of teeth increased. Finally, the meshing stiffness distribution curve of gear with load. And the result showed that the impact of tooth profile error on meshing stiffness of gear with tooth profile error was severer than that on meshing stiffness of gear with ideal tooth profile.