Taking the nutation double circular arc spiral bevel gear as the research object, the finite element method is used to carry out load contact analysis on it, and to explore its tooth surface contact characteristics. Finally, the following conclusions can be drawn:
1) In the meshing process of nutation double circular arc spiral bevel gear pair, the contact point of tooth surface moves along the direction of tooth width, and undergoes the meshing process of single point contact, double point contact and single point contact in a meshing cycle. Among them, in the middle meshing stage, the tooth surface is in the two-point contact state, at which time the contact area reaches the maximum and the bearing capacity is also the best.
2) The contact stress near the small end of the concave tooth surface of the double-arc spiral bevel gear is the largest, which is the dangerous point of contact strength. Therefore, attention should be paid to the selection of the structural parameters of the double-arc spiral bevel gear when carrying out the geometric design of the double-arc spiral bevel gear.
3) The coincidence degree of double circular arc spiral bevel gears increases with the increase of load. Increasing the load will not change the change rule of load distribution coefficient, but will reduce the peak value of load distribution coefficient.
4) Negative offset error and positive nutation angle error will lead to edge contact on the tooth surface, which will increase the contact stress and load distribution coefficient, which is not conducive to the stability of the double-arc spiral bevel gear transmission, and should be strictly controlled in actual working conditions.