Rolling impact calculation of helical gear

Based on the proposed calculation method of meshing impact force, the optimum profile design of small gear tooth surface with minimum meshing impact is carried out.The population number of genetic algorithm is 40, evolution algebra is 30, crossover probability is 0.6, variation probability is 0.1 and takes about 3.5 hours.

According to the optimized profile parameters, Fig. 1 shows the three-dimensional profile of the tooth surface.TE and LTE for standard tooth surfaces are given in Figure 2(a).Figure 2 (b) shows TE and LTE for the modified tooth surface. From the figure, it can be seen that the modified tooth surface is sufficient for the set load of 1000Nm, and the clearance between the teeth is sufficient to compensate for the effect of the tooth on the load deformation of No. 1. Rolling interference is avoided. When the large wheel engages, it engages from the large tooth surface, which will help to reduce the impact speed of the rodent and thus the impact of the rodent.Power.

Rolling impact is reduced by up to 66% after tooth profile modification.Due to the deformation of the load on the standard tooth surface, the contact between the large tooth crown and the small tooth surface outside the theoretical engagement line results in meshing interference, which results in a large impact force.When the tooth surface is modified, the clearance between the teeth increases, eliminating the rodenting interference, so the impact force of rodenting decreases greatly.However, tooth surface modification and tooth deformation have destroyed the original standard conjugate surface, and the instantaneous engagement line of large and small tooth surfaces at the rodent point still deviates slightly from the theoretical engagement line, and there is a certain speed difference at the rodent point.Therefore, there is still an impact force when the modified tooth surface contacts.