The friction coefficient of tooth surface in helical gear meshing is f ≤ 0 2. Combined with the relevant research and the relevant parameters of helical gear in this paper, the tooth surface friction coefficient calculated in this simulation is 0.5 ０１ ～ ０. 2 selection. In the elastic model, the helical gear tooth surface is set as the friction contact model without considering friction. The change curve of contact force of 2 tooth surface under three different friction factors (0.05, 0.10 and 0.15) is studied, as shown in Figure 1.
When the contact wire is in a stable length, the greater the friction coefficient, the greater the contact force; When there is friction on the contact helical gear tooth surface, the friction state of the helical gear tooth surface is sliding friction, so the contact area will be reduced. Therefore, the contact force of the helical gear tooth surface is greater than that without considering friction.
Figure 2 (a), figure 2 (b), figure 2 (c) and Figure 2 (d) represent the tooth root stress under four friction factors. It can be seen that the root stress increases with the increase of friction coefficient; Because the tooth surface friction in helical gear meshing will change the contact stress and tooth deformation, the tooth root stress will also change, so the influence of helical gear tooth surface friction on tooth contact load can not be ignored.