In order to qualitatively study the influence of meshing impact time on the vibration characteristics of helical gear transmission, the meshing impact time (5.6% TZ) of the input gear pair of electric vehicle reducer in this paper is widened to both sides (4% TZ, 8% TZ), three different impact times are input into the dynamic system, and the system response is obtained by solving the system response The vibration speed diagram of the system is shown in Fig. 1 and Fig. 2.

It can be seen from Fig. 1 and Fig. 2 that the gear pair has different meshing impact time, the resonance speed of the system has no obvious change, and the meshing impact time has a significant impact on the vibration response of the system. The longer the meshing impact time is, the greater the vibration response of the system is. Therefore, in the actual design of high-speed helical gear transmission, the impact time of gear meshing should be reduced as much as possible, that is to say, the comprehensive deformation of gear load should be reduced as much as possible.