Structural design for planetary roller screw mechanism based on the developed contact modelling

Abstract

The structural design of planetary roller screw mechanism (PRSM) with lower contact stress is beneficial to delay the fatigue failure and prolong the service life. However, few studies focused on this field and a reasonable contact model is therefore required due to its complexity structure. In this paper, a developed contact model is established for PRSM, and a process-based parameterization method is proposed to precisely calculate the contact characteristics along with the change of parameters. Based on the in-depth study of the parameter sensitivities of contact characteristics, the structure design to reduce contact stress for PRSM is realized through the multi-objective optimization under the proposed geometric constraints. The validity of this model is well verified by finite element method.