The rigid flexible coupling model of helical gears with different support stiffness was established, and the influence of different support stiffness on the eccentric load effect of helical gears was studied through simulation and experiments; The surface of helical gears was treated with manganese phosphate conversion coating, and the effect of the coating on the contact characteristics and contact fatigue pitting of the tooth surface after running in of helical gears was studied.
1) Theoretical and simulation analysis was conducted on the influencing factors of the meshing misalignment of helical gears.
2) As the support span of the gear shaft system increases, the support stiffness decreases, the meshing misalignment significantly increases, and the eccentric load effect intensifies; By reducing the span of the tooth shaft and increasing the support stiffness, the load distribution per unit length of the tooth surface is uniform, and its amplitude is greatly increased.
3) After running in, compared with uncoated helical gears, the transmission error of coated helical gears is significantly reduced, and the stress concentration area shifts towards the center of the meshing tooth surface, effectively reducing load mutations and making helical gear transmission more stable.
4) The contact fatigue pitting experiment of helical gears shows that in the initial running in stage, the surface macroscopic morphology and dynamic performance of coated helical gears are significantly improved compared to uncoated helical gears; At the same time, coating can improve the meshing state of helical gears, weaken the eccentric load effect, increase the load-bearing capacity of helical gears, and thus increase the fatigue life of helical gear pairs.