The modification amount of helical gear profile CA = 30 μ m. The helical gear profile modification length La = 6.4mm is taken as the optimal helical gear profile modification value. On this basis, the effects of different tooth direction modification amount and different tooth direction modification length on helical gear stiffness and transmission error are studied.
Figure 1 shows that the helical gear tooth direction modification length Lc = 5mm, and the helical gear tooth direction modification amount CC are 0, 2.5, 5.0, 7.5, 10.0 and 12.5 respectively μ M, the comprehensive meshing stiffness, transmission error and stiffness mean square deviation of helical gear.
It can be seen from Fig. 1 (a) and (b): different helical gear tooth direction modification has little effect on the stiffness and transmission error in the meshing area of few teeth, but has a great effect on the stiffness and transmission error in the alternating area of helical gear teeth and multi tooth area; With the increase of helical gear profile modification, the fluctuation of meshing stiffness first decreases to the fixed value and then increases, while the change trend of transmission error is opposite to that of meshing stiffness.
Figure 2 shows the helical gear tooth direction modification CC = 5 μ m. When the tooth modification length Lc of helical gear is 0, 2.5, 5.0, 7.5, 10.0 and 12.5mm respectively, the mean square deviation of comprehensive meshing stiffness, transmission error and meshing stiffness of helical gear. Comparing Figures 8 and 9, it can be seen that under the same helical gear profile modification parameters, except for different amplitudes, the influence of different helical gear profile modification lengths on meshing stiffness and transmission error is consistent with the influence of different modification quantities on meshing stiffness and transmission error.
According to Fig. 1 (c) and Fig. 2 (c), the modification amount of helical gear profile CA = 30 μ m. The helical gear profile modification length La = 6.4mm is taken as the optimal helical gear profile modification value, and the helical gear tooth direction modification amount is 5.0 μ m. When the modification length is 5mm, the meshing stiffness mean square deviation is the smallest, that is, the meshing stiffness fluctuation is the smallest. Compared with the unmodified length, the stiffness mean square deviation decreases by 96.69%.