Contact analysis of modified helical gear

1. Law of equivalent stress and time change during helical gear meshing

The variation law between the dynamic contact equivalent stress of helical gear and practice is given, as shown in Figure 1 and 2.

From figures 1 and 2, it can be seen that the overall maximum stress value decreases after modification. At the same time, it can be seen that the change of stress value is also small. It can be seen that the helical gear operates more smoothly after optimization.

2. Equivalent stress nephogram of helical gear at different times

The stress magnitude and distribution at the engagement of helical gears before and after optimization are compared, as shown in the following figure:

It can be seen from figures 3 to 6 that after optimization, the contact stress value of the helical gear is reduced, and the stress distribution of the helical gear is more uniform. The stress concentration in the tooth direction is reduced, and the optimization effect is good.

3. Contact pressure distribution

(1) Pressure history diagram and contact state during helical gear meshing:

It can be seen from Figures 7 and 8 that the helical gear has a considerable effect after optimization, both in terms of the contact pressure curve trend and the maximum contact resistance value. Comparing the analysis results before and after optimization, it is found that the contact pressure fluctuation of the helical gear is small. Before optimization, the helical gear will have a large oscillation almost every 0.05s. At the same time, the maximum contact pressure is reduced from 139m to 117mpa, and the optimization effect is good.

(2) Optimize front and rear helical gear contact

It can be seen from Figures 9 and 10 that the maximum contact pressure of the optimized model decreased significantly at 0.15s, from 126.89mpa to 96.53mpa, a decrease of about 15%, and the optimization effect was good.

It can be seen from figures 11 and 12 that during the contact process of helical gears, most of them are in near and sliding States, and there is no sticking state, indicating that the helical gears are in good operation.

From the contact state, the optimization effect is not very obvious, but it can be seen that the optimized contact state is still good, and the optimization has not affected the original better contact state.