Three dimensional finite element model of helical gear contact characteristics

The three-dimensional model of helical gear is established, and the contact analysis of helical gear is carried out by finite element method. The effects of plastic deformation, tooth surface friction, temperature and material linear strengthening on the contact characteristics are studied. Finally, the simulation model is verified by comparing the experimental results with the simulation results; And draw the following relevant conclusions.

(1) Under four loads (400, 1000, 1500 and 2000N · m), the contact force of helical gear tooth surface of elastic-plastic model increases by about 0.5% compared with elastic model at the time of stable contact line length 11% 、1. 84% 、2. 01% 、3. 13%, the greater the load, the more obvious the effect; In a certain range of sub surface depth, the stress of the elastic-plastic model is always not greater than that of the elastic-plastic model, but with the increase of depth, the reduction rate of the elastic model is small, and the plastic deformation area of the sub surface will expand with the increase of load.

(2) After considering the friction of helical gear tooth surface, in the stage of stable length of contact line, the contact force of helical gear tooth surface is greater than that without considering friction coefficient; And the greater the friction coefficient, the greater the root stress of helical gear.

(3) After considering the influence of helical gear tooth surface temperature on contact load, the maximum value of helical gear tooth surface contact force considering temperature will be less than that without considering temperature; It shows that temperature has a certain influence on the contact force distribution of helical gear tooth surface.

(4) The variation trend of the maximum surface stress of the three strengthening models in different load ranges is different, so the stress and plastic deformation of the secondary surface are also different; It shows that the selection of appropriate material strengthening degree has an important influence on the contact surface stress.

(5) Through the temperature rise experiment, it can be seen that due to the poor heat dissipation effect at the top of the helical gear, the temperature in the top area of the helical gear is higher than that in the root area in the experiment and simulation, and the experimental results are lower than the simulation results, but the change trend is consistent, which shows the reliability of the simulation model; In the strain test, the change trend of the helical gear tooth root bending stress is basically consistent with the simulation curve, and the relative error of the maximum bending stress is less than 20%, which is within the acceptable range, which verifies the accuracy of the simulation model.

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