The dynamic loading analysis adopts the same finite element mesh model as the static analysis, but the dynamic explicit analysis algorithm is selected as the analysis type. In the dynamic analysis, the contact property of hard contact calculates the pressure when the gap of the contact surface is 0, and the figure shows the hard contact relationship of the contact surface.
According to the actual working characteristics of spiral bevel gears, the tooth surfaces in contact between the two gears are defined as hard contact contact pairs. In order to realize the rotational movement of the gear, two rigid gear shafts are established respectively, and the binding constraints are established between the outer surface of the shaft and the inner surface of the gear. Establish reference points on the axis of each gear shaft. Release the degrees of freedom rotating along the axis on the reference point and constrain the other five degrees of freedom. The resistance torque and speed are applied to the reference points of the big gear and the small gear respectively. Apply speed on the small wheel (driving wheel) according to the actual working conditions ω， Torque T is applied to the large wheel (driven wheel), and the loading time is t. The selected friction coefficient is f = 0.06. Because the damping problem is complex, it is difficult to accurately describe the influence of damping factors on the results, and the damping problem is not considered in this paper. In order to study the influence of the speed and torque of spiral bevel gear on its meshing characteristics, the loading contact analysis was carried out under various working conditions.
It can be seen that working condition 1, working condition 2 and working condition 3 can compare and analyze the influence of speed on the dynamic meshing performance of spiral bevel gear; Working conditions 1, 4 and 5 can be compared and analyzed. The dynamic meshing performance of spiral bevel gear is affected by the torque. In order to avoid the strong impact caused by the initial load, the smooth amplitude curve is used for loading. The output calculation results under dynamic loading mainly include the rotation angle, speed, tooth surface contact force, contact area, contact stress and tooth root bending stress of two spiral bevel gears. According to these results, the meshing characteristics of gears can be analyzed.