A Method of Tooth End Modification and Parametric Modeling of Involute Straight Bevel Gears

Abstract

The invention disclose s an involute bevel gear tooth end relief and parametric modeling method which includes the steps of building a three-dimensional model of a bevel gear without the relief; building a finite element model of the bevel gear without the relief; determining 4 key engaging positions in the gear engaging process according to the gear engaging period to obtain the gear circumferential displacement difference value and the tooth width-direction equivalent contact stress distribution; determining the relief amount and the relief length of the tooth end relief; building a relief curve equation and a relief tooth surface equation; realizing the primary modeling of the relief curve and the tooth surface after the relief, and building a three-dimensional model of the relief gear; analyzing the gear after the relief by finite element analysis software and comparing the gear after the relief with a gear without the relief. The tooth surface contact condition is improved, the vibration noise in the gear engagement is reduced, and the NVH quality of the gear is improved.

Description

technical field [0001] The invention relates to a gear modification and modeling method, in particular to a tooth end modification and parametric modeling method of an involute straight bevel gear. Background technique [0002] Due to the influence of factors such as manufacturing accuracy, machining error and load distribution in the actual use of involute straight bevel gears, the actual meshing tooth surface deviates from its theoretically designed spherical involute, so the gear is running During the process, the vibration and noise increase, which seriously reduces the NVH quality of the gear. [0003] The modification of traditional involute straight bevel gear mainly includes tooth profile modification, tooth direction modification, tooth end modification and so on. For example, the Chinese patent application with the publication number CN1936749A discloses a direct modification method for involute straight bevel gears, which adopts the comprehensive modification met...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent application with the publication number CN101937211A discloses a modification method for involute straight bevel gears. The dynamic finite element simulation method is used to determine the amount of tooth profile modification at the large end of the bevel gear. First, use the 3D modeling software to make the modified profile on the center section of the gear tooth, and stretch the modified profile to the tooth surface to achieve equidistant teeth. The modeling process of the modified gear, and finally the modified gear processing through the CNC machine tool is a relatively reasonable modified gear processing method, but its disadvantage is that it can only realize the equidistant modification of the tooth direction, and the parameters cannot be adjusted according to actual needs. Modify the shape, change the modification parameters

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