Abstract
As key components to transmit power and motion between intersecting shafts, it is necessary to design feasible tooth axial modification to improve the meshing performance and bearing capacity of straight bevel gears. The main purpose of this paper is to propose an effective axial modification method of straight bevel gears considering alignment errors. In this paper, the meshing performance of two kinds of tooth axial modification method (tooth end relief and symmetric crowned modification) for straight bevel gears is investigated by the finite element analysis (FEA). The results show that the tooth end relief is an optimal method to enhance the meshing performance of gears in different installations for decreasing transmission errors, reducing maximum contact stress and bending stress and improving the distribution of contact stress and bending stress. This research provides a suitable tooth end relief method of straight bevel gear with alignment errors.
Highlights
As key components to transmit power and motion between intersecting shafts, straight bevel gears are extensively applied in automobiles and mechanisms for the advantages such as smooth transmission, high load-carrying capacity and low noise
From the analysis in this article of the simulation of meshing performance of modified straight bevel gears, it can be concluded that: (1) Both the tooth end relief and the symmetric crowned modification can avoid the edge effect caused by shearing action and alignment errors, and improve the contact area which increases the bearing capacity of gear pair
(2) Both the tooth end relief and the symmetric crowned modification can reduce the sensitivity of bending stress to alignment errors
Summary
As key components to transmit power and motion between intersecting shafts, straight bevel gears are extensively applied in automobiles and mechanisms for the advantages such as smooth transmission, high load-carrying capacity and low noise. In practical straight bevel gear drives, the non-uniform deformation of tooth and alignment errors of gear pairs always exist. Non-uniform deformation of tooth and alignment errors of gear pairs directly affect the meshing performance and transmission quality of straight bevel gear drives, which may decrease the transmission stability and load uniformity of gear drives greatly and increase the vibration and noise of gear drives dramatically. In gear tooth meshing performance aspects, Xie et al [1] combined the theoretical calculation and finite element analysis to investigate spur gears meshing performance. Wang and Hua [3] obtained meshing performance of non-modification spiral bevel gear pairs with alignment errors by finite element analysis (FEA). Zhu et al [6] studied the influence of shaft alignment errors on loaded tooth contact in crossed gears. The paper published by Chen and Tang [7] presented the contact path and transmission errors of spur gears with single alignment error and coupling alignment errors
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