Study on the influence of 3d modification on dynamic characteristics of herringbone gear transmission system

The 3d modification is a advanced technology that comprehensively considers tooth profile modification and axial modification to reduce vibration and noise. Therefore, this paper combines 3d modification technology with contact characteristics and dynamic properties to study the influence of 3d modification on the dynamic performance of herringbone gear system. This paper employs parabolic tooth profile instead of the cutter straight tooth profile to achieve 3d modified tooth surface and deduces tooth surface equation. Then, the tooth contact analysis (TCA) and loaded tooth contact analysis (LTCA) are used to simulate the meshing process of teeth. And the dynamic model of herringbone gear system under three internal excitations is established. Finally, 3d modification, TCA, LTCA technology and gear dynamic characteristics are combined to study the influence of 3d modification on the system dynamic behavior. The results show that, compared with tooth profile modification and axial modification, the 3d modification can effectively compensate the influence of errors on gear system and have very good damping effect. The relative vibration displacements on the left and right meshing lines of gear pair are reduced by 47.60% and 51.20%, and root mean square values are decreased by 30.50% and 36.10% before and after modification.