Characteristics of pitting corrosion model of gear tooth surface

The tooth surface pitting model can be established through the gear modification parameter module in Fig. 1. By defining the 3D geometric parameters of the simulated tooth surface pitting dimension features, the simulated pitting geometric parameters are imported into the gear modification parameter module in Fig. 1 in the external input mode to carry out any modification effect of the ideal tooth surface features, that is, the real simulation of any pitting features.

The simple rectangular pitting model is taken as an example to simulate the pitting characteristics of gears and establish the dynamic simulation analysis model of gear system. The data is mainly based on the data along the tooth profile direction (from the root to the top) and along the tooth width direction. The size of the pit is set by the spatial position determined by two points. Since the main distribution area of pitting is near the pitch line, the depth of large rectangular pitting is set as 0.5mm, the span along the tooth profile direction is 75.5-78.5mm (the distance from the gear center), and the span along the tooth width direction is 6-30mm (the distance from one end face of the gear).

As shown in Figure 2 (a). The contour map can clearly show the position and geometric size of the simulated pitting on the tooth surface. Because the system will connect and compensate the non pitting and pitting with the effect of linear difference, the transition zone effect between the pitting and non pitting tooth surface will appear. According to the calculation method of pitting projection area occupying the projection area of tooth surface, the pitting percentage of tooth surface is about 11.2%. At the same time, the simulation data of tooth surface pitting features are imported into the gear model, and the gear model with pitting features obtained is shown in Figure 2 (b).