The vibration characteristics of two-stage helical gear drive under meshing impact excitation are further analyzed, and the vibration response of single-stage helical gear drive under meshing impact excitation is compared with that under single-stage helical gear transmission. The vibration time domain diagrams of input and output end teeth pairs under engagement impact excitation are compared and analyzed respectively under three kinds of speed of input speed, 3000rpm, 12000rpm and 15000rpm, as shown in Fig. 1-3 As shown in Fig.
It can be seen from the time domain response diagram in Fig. 1 that the main characteristic of the vibration time domain of the two-stage helical gear transmission system under the single excitation of meshing impact is the sudden change of the relative vibration acceleration in the meshing impact area, which is consistent with the analysis in Chapter 4. However, in Fig. 1 (b), in addition to the relative vibration acceleration mutation caused by the influence of its own meshing impact force, there is also an acceleration mutation caused by the influence of input end teeth on the meshing impact in the time domain response of the output end teeth to the vibration time domain response, and its frequency has obvious frequency corresponding relationship with the acceleration mutation caused by the input end teeth to the meshing impact. This is due to the influence of the input tooth pair meshing impact force on the output end tooth pair. Because the rotation speed of the two is opposite, the direction of the meshing impact force is opposite, so the direction of acceleration mutation is also opposite.
It can be seen from Fig. 2 and Fig. 3 that in the vibration time domain of the output tooth pair, there is a sudden change of the vibration acceleration at the meshing time corresponding to the impact area of the input tooth pair, which is consistent with the analysis results in Fig. 1. What is different from Fig. 1 is that the influence of the output end teeth pair on the meshing impact force on the input end teeth pair can be clearly seen. Combined with figure 1, this phenomenon shows that the influence of input end tooth pair vibration on output end tooth pair is obviously greater than that of output end tooth pair on input end tooth pair. This is because the input end teeth pair is the power source of the output end tooth pair, and the input end tooth pair has high speed and large meshing impact force, so it has a great influence on the vibration of the output end teeth.
In addition, the system response at 3000 rpm in Fig. 1 does not show the effect of the impact force on the input tooth pair vibration, while in Fig. 2 and 3, 12000 rpm and 15000 RPM are not found The results show that the influence of S / M (/ degree speed plus square line meshing 2) teeth at the output end on the input teeth on the vibration can be seen clearly. This shows that the higher the speed, the more obvious the interaction between the two teeth.