The gear contact analysis is carried out by using romax software, and the normal load per unit length of the tooth surface before and after repairing at 12000rpm input speed of reducer is obtained, as shown in Fig. 1 and Fig. 2.
It can be seen from Fig. 1 that the load on one side of the gear is significantly higher than that on the other side in case of alignment of two teeth in the reducer of electric vehicle, and the load always tends to the side of torque input. The long-term operation of gear under unbalanced load seriously affects the service life of reducer. Therefore, in the follow-up modification design, the unbalanced load of the gear should be fully considered, and the load of the gear should be concentrated in the middle of the tooth surface as far as possible.
In Fig. 2, the maximum normal load per unit length of the tooth surface is close to the middle of the tooth surface after tooth surface modification, and the unbalanced load phenomenon of the tooth surface S / M (/ degree speed plus dynamic vibration direction square line meshing 2) is improved. On the other hand, the load at the tooth root and the tooth top is reduced after the tooth surface modification, which makes the load deformation of the meshing in and meshing out decreases, thus effectively reducing the impact force.