Study on dynamic modeling and transmission characteristics of inverted planetary roller screw mechanism
FENG Weidong
WANG Shisong
DENG Xingqiao
WU Guicheng
ZENG Liyuan
CAI Dajing
Abstract：[Objective]The inverted planetary roller screw mechanism(IPRSM)is a new precision heavy-duty transmission device with high precision,large load,and long life.Due to the characteristics of multi-parts,multi-point contact,and multi-moving pairs,the dynamic behavior of the IPRSM are difficult to predict accurately.[Methods]To address this issue,a dynamic model of IPRSM was established by using the RecurDyn software,considering the complex contact and motion relation between the nut,the roller,the lead screw,and the cage.Based on verifying the validity of the dynamic model,the model was successfully used to analyze the influence of the nut speed and the screw load on the transmission characteristics of the IPRSM.[Results]The results indicate that the average contact forces between the rollers and the screw,as well as between the rollers and the nut,exhibit a positive correlation with both the nut rotation speed and the screw load.Due to the contact deformation between various components,uneven load distribution occurs between the meshing teeth of the rollers and the screw,and also between the left and right journals of the rollers and the inner holes of the cage.This research can provide support for the structural design and optimization of the IPRSM.
Keywords：Inverted planetary roller screw mechanismDynamic analysisTransmission characteristicsSimulation mod-eling
Publication Date：2025-11-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 35-41,56 )