Study on Meshing Dynamic Characteristics of Cylindrical Spur Gears Facing Tooth Profile Modification
In order to study the meshing characteristics of spur gear transmission system with tooth profile modification,the analysis model of modified spur gear transmission is established.The model considers Hertz contact stiffness,bending stiffness,shear stiffness,axial compression stiffness and fillet foundation stiffness,and gives two different geometric designs of tooth profile modification.On this basis,the effects of tooth profile modification on time-varying meshing stiffness(TVMs)and dynamic char-acteristics are studied by numerical simulation.For a single tooth profile modification,although the positive modification in-creases the thickness of the gear,it reduces the tooth stiffness of the gear and the contact ratio of the gear pair,which intensifies the vibration of the gear system.On the contrary,negative displacement can improve the tooth stiffness of the gear,increase the contact ratio of the gear,and make the transmission of the gear system more stable.For compound displacement,Sgear transmis-sion with negative compound displacement will increase TVMs and significantly reduce vibration,while s0 gear displacement has little impact on time-varying meshing stiffness(TVMs),but has a great impact on dynamic characteristics.
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