Influence of assembly failure on the meshing stiffness of gears

ZHANG Chen-liang, ZHAO Xin
(School of Mechanical Engineering, Guizhou University, Guiyang 550025, China)

Abstract: Aiming at the problems that the transmission system was deformed due to improper installation or operation of the gear pair, and the misalignment of the gear pair would cause the unstable operation of the gear pair, the potential energy method was used to analyze the three assembly faults of the radial displacement, axial displacement and angular displacement of the straight gear pair. An analysis of the influence of gear pair meshing stiffness was carried out. The meshing stiffness calculation algorithm of potential energy method was improved to make it possible to calculate the meshing stiffness under assembly failure, and the results were compared with the finite element model to verify the accuracy of the potential energy method to solve the meshing stiffness model of assembly failure. The results of the study indicate that all three assembly failures can lead to a reduction in the timevarying meshing stiffness of the gear pair.Axial displacement can reduce the amplitude of meshing stiffness, while the radial displacement can make the phase of the meshing stiffness curve shift forward and the curve amplitude decrease，the angular misalignment has the most serious effect on the change of the meshing stiffness. Even a small angular deviation can greatly reduce the meshing stiffness, but this decreasing trend can decrease as the offset angle becomes larger.

Key words: assembly failure; meshing stiffness;  potential method; spur gear