Take 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 helical gear profile modification amount and different helical gear profile modification length on the vibration response of helical gear system are studied.
It can be seen from figures 1 and 2 that the dynamic performance of the helical gear system has been greatly improved after appropriate helical gear profile modification, so the helical gear tooth direction modification value should not be too large. Take the helical gear tooth profile modification length Lc = 5mm, and the tooth profile modification amount CC are 0, 2.5, 5.0, 7.5, 10.0 and 12.5 respectively μ M, X and X of special node main gear node θ The amplitude frequency curve of vibration acceleration varying with speed in Z direction is shown in Fig. 3.
Compared with only tooth profile modification, the variation trend of vibration acceleration amplitude frequency curve of driving wheel is the same; With the increase of helical gear profile modification, the amplitude of vibration acceleration decreases as a whole when the profile modification is 5.0 μ M, the vibration acceleration amplitude is the smallest, and when the modification continues to increase, the vibration acceleration amplitude increases.
Helical gear tooth direction modification CC = 5 μ m. When the helical gear tooth direction modification length LC is 0, 2.5, 5.0, 7.5, 10.0 and 12.5mm respectively, the X and of the special node main gear node θ The amplitude frequency curve of vibration acceleration varying with speed in Z direction is shown in Figure 4. Comparing figures 3 and 4, it can be seen that the variation of amplitude frequency curve of vibration acceleration of driving wheel under different tooth direction modification amount and tooth direction modification length is relatively consistent. When the modification length is 5.0mm, the amplitude of vibration acceleration is the smallest. Thus, it is determined that the comprehensive optimal modification value of the gear is: the tooth profile modification amount CA = 30 μ m. Tooth profile modification length La = 6.4mm, tooth direction modification amount CC = 5 μ m. Tooth profile modification length Lc = 5mm.