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The position of several pairs of contact wires during the calculation of the dynamic stress of the planetary gear transmission root and the stiffness of the teeth of the corresponding position. According to the above analysis results, the meshing rigidity of the teeth is further obtained, and the distribution of the load between the contact lines at each meshing position and the distribution of the load on each contact line provide a more accurate loading position for the calculation of the strength of the gear. Tooth surface load distribution.
Calculate the distribution of the load between the contact lines and the distribution of the load on each contact line for each meshing position. Use the APDL language in Ansys to form the load file [4], and import the corresponding load file during the calculation to make contact with the gear teeth. Look for the load calculation near the node near the load point.
Since the coincidence of the gears is not an integer, the number of teeth that the Roots vacuum unit participates in at the same time alternates. In simplifying the calculation, it is considered that the root stress of a certain tooth is mainly affected by its own meshing force and the two upper meshing forces adjacent to the left and right, and the meshing force on the tooth farther adjacent to it The influence of the root stress of the tooth is negligible.
Therefore, the model for calculating the root stress in this paper is to retain only a few teeth for loading, while ignoring the other loads involved in the meshing teeth.
In a power split planetary transmission, the differential stage sun gear meshes with three planet wheels. In order to reduce the amount of calculation, the sun gear is shaved in the model establishment, specifically, the straight tooth coupled with the coupling is smoothed to the indexing circle; the herringbone teeth meshing with the planetary wheel only retain 5 teeth, And the 5 teeth are shaved to the indexing circle, and the remaining teeth are flattened to the indexing circle, but only loaded in the middle 3 teeth. When dividing the grid, only the middle 3 teeth are densified, and the rest Two teeth ensure the integrity of the gear model.
In order to reduce the calculation scale and improve the calculation efficiency, the specific measure of the Zhoucun sofa sun wheel meshing is to set the smallest possible unit size on the three tooth surfaces of the load, and also to the root of the loaded gear teeth. Set the mesh cell size as small as possible to divide the dense mesh.