Abstract
Abstract. Based on gear meshing theory, the tooth surface equation with tooth profile modification parameters is deduced, the tooth surfaces of unmodified and modified gears are constructed, the three-dimensional model of unmodified and modified double helical gear-shaft-bearing system is established and then the three-dimensional contact finite element model of double helical gear-shaft-bearing system is established and the load-bearing contact analysis of the tooth surface is carried out. The actual contact state of the tooth surfaces of double helical gears under different shaft stiffness and power transmission paths is investigated, and the influence of tooth modification parameters on the load distribution of the tooth surfaces of double helical gear pairs is studied. The results show that the tooth surface bearing the contact of the herringbone gear system has the phenomenon of partial load due to the supporting deformation, and the unmodified herringbone gear has obvious contact stress concentration. However, the phenomenon of partial load and stress concentration can be effectively improved by gear tooth modification.
Highlights
Large ships usually use wide tooth surface cylindrical gears with large bearing capacity, high transmission efficiency, stable transmission, compact structure and long life, and especially herringbone gears with high coincidence degree and large tooth width are used
On the basis of traditional gear tooth bearing contact analysis, this paper further studies the influence of support system deformation and power flow direction on the bearing contact of the herringbone gear tooth surface, and modifies the gear based on its actual contact state, in order to further reduce the vibration and noise of gear transmission
In order to study the specific influence of the stiffness of the supporting shaft segment on the contact state of the tooth surface, the bearing contact state of the herringbone gear system with five different stiffness is calculated by changing the elastic modulus of the shaft section to change the stiffness of the shaft section
Summary
Large ships usually use wide tooth surface cylindrical gears with large bearing capacity, high transmission efficiency, stable transmission, compact structure and long life, and especially herringbone gears with high coincidence degree and large tooth width are used. Tesfahunegn (2010) used the contact finite element method to study the influence of tooth profile modification on bending stress, transfer error and contact stress of spur gear pair. Lin (2017) used finite element software to carry out load-bearing contact analysis on gears with errors and modifications and studied the error analysis method of the helical gear system coupling transmission. On the basis of traditional gear tooth bearing contact analysis, this paper further studies the influence of support system deformation and power flow direction on the bearing contact of the herringbone gear tooth surface, and modifies the gear based on its actual contact state, in order to further reduce the vibration and noise of gear transmission
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