Multi-point erosion model of gear transmission system along tooth profile direction

For as shown in figure 1 (a) along the direction of the tooth profile of multipoint corrosion characteristic model, selecting three points along the tooth profile section distribution of corrosion pit prefabricated model, simulation analysis is shown in figure 2 CP trajectory in the B2C segment, segment and PD segment precast pitting corrosion pit respectively, for the convenience of fast calculation and analysis of the simulation program, set up three points take same pitting corrosion pit geometric features. The fixed depth hs = LMM and different widths Ws = 8min or Ws = 16mm were selected to calculate and discuss the time-varying meshing stiffness of the gear along the direction of the tooth profile.

(a) Meshing motion (b) Single double meshing zone

Fig. 3 plots the time-varying meshing stiffness of the gear under the calculation parameters of two pitting pits. In Fig. 3 (a), the characteristic stiffness without pitting is set as curve 1, and the pitting characteristic (hs = LMM, Ws = 8mm;) Stiffness is curve 2, and pitting characteristics (hs = LMM, Ws = 16mm) stiffness is curve 3. The variation of the stiffness curve in the figure shows that the pitting characteristics make the value of time-varying gear meshing stiffness decrease, and the value of the stiffness in the simulated pitting area decreases more obviously than that in the non-simulated pitting area. Said in order to further reduce the amplitude of its stiffness, shown in figure 3 (b), draw the stiffness variation curves, the stiffness variation curves show curve’s stiffness reduction is more than 3 2, the reduction is, this is mainly due to the characteristics of pitting corrosion width is greater than 3 simulation curve 2 characteristics of pitting corrosion, shows that with the increase of the width of pitting corrosion pit gear time-varying meshing stiffness value decrease, the more obvious. By comparing the average stiffness of the precast pitting area, the percentage of stiffness reduction of curve 2 compared with curve 1 is 1.23%, 2.44% and 2.49%, respectively, while the percentage of stiffness reduction of curve 3 compared with curve 1 is 3.11%, 6.43% and 6.50%, respectively.

(a) Meshing stiffness (b) Poor stiffness