It can be seen from the comparison of tooth surface contact area under no-load and load that there is a great difference between them. It is necessary to carry out LTCA analysis whether adjusting machine tool parameters or studying the meshing state of gears. It can be seen from time 1 of Fig. 1 and time 1 of Fig. 2 that edge contact occurs at this time. Previously, it was considered that the contact area is an incomplete ellipse, but from these two contact areas, the shape of the contact area is uncertain. Therefore, the shape of the contact area is complex.

By iteration of the formula, the contact stress of the tooth surface contact point pair can be obtained, and the pressure distribution in the contact area can be obtained. The pressure distribution diagram of the two contact areas with the number of big teeth of 47 and the number of small teeth of 33 under the torque of 600nm is given. Fig. 3 is the pressure distribution diagram of the contact area at time 1 under the transmission torque of 600nm, taking the spiral bevel gear pair with the number of big teeth of 47 and the number of small teeth of 33 as an example, and Fig. 4 is the pressure distribution diagram of the contact area at time 2.