Through the transient analysis, the stress and strain distribution and the variation law of the finite element model of the helical gear pair can be obtained at any time. The most sinister loading position of the tooth root is actually the position where the bending stress of the gear pair is the largest during the meshing process. . Observe the root bending stress at any time during the meshing process of the driving wheel and the driven wheel, respectively, and accurately determine the maximum bending stress position of the root. The overall meshing position of the gear pair at the moment of the bending stress. It can be seen from the figure that the maximum bending stress position of the driving wheel and the driven tooth root is not at the same time, that is, the corresponding meshing position is not corresponding. Therefore, the tooth root fatigue life analysis should be performed on the main and driven wheels respectively.
Using the calculation method of the bending strength of the helical gear in GB/T3480-1997, the bending fatigue life of the helical gear pair of the reducer of the transverse shaft boring machine is calculated, and the oil-cooled electric drum is fireproof and limited. The meta-analysis method was used to compare the results. Table 2 shows the analysis results of the two analytical methods. As can be seen from the table, the traditional method can not accurately determine the most malicious loading position of the root bending. In the traditional method, the equivalent spur gear method is used to calculate the force of the gear teeth. In the actual transmission process, the multi-tooth pair of the helical gear pair participates in the meshing at the same time. The contact line is obliquely straight along the tooth width and changes instantaneously. The load along the contact line at the same meshing position It has a nonlinear distribution, so the ultimate bending stress and the obtained safety factor obtained by the traditional method are approximate.
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