Stress is the internal force per unit area, which reflects the stress of planetary gear blank. Figure 1 and 2 show the stress distribution of the three schemes at the end of the first stage and the second stage. During the whole deformation process, the stress in the transition fillet area of the planetary gear tooth root is large, and the stress expands in an arc from the tooth root to the tooth surface. Due to the existence of the upper and lower bosses, the stress at the fillet of the upper and lower boss end face is also large.
The stress distribution of the three schemes is basically the same, and the stress value of scheme B is relatively small compared with the other two schemes.