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The planetary reducer is a key component of the main drive system of the shield tunneling machine. During operation, the frictional heat on the tooth surface causes the gear temperature to be too high, resulting in thermal stress and deformation that directly affect the time-varying meshing stiffness of the gear teeth. Gear stiffness, as an important internal excitation of the gear system, is the basis for analyzing the dynamic characteristics of the system. In this paper, the finite element method is used to study the temperature field of the shield machine reducer planetary gear system, and on this basis, the time-varying meshing stiffness of the gear considering temperature effects is calculated. The results show that, considering temperature, the single tooth meshing stiffness of the gear pair increases significantly in the single tooth meshing zone, and the time-varying meshing stiffness increases overall. The research results of this article provide a theoretical basis for accurately predicting the dynamic characteristics of shield machine reducers
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