Multi-rollers statics analysis of planetary roller screw mechanism based on explicit expression.

This study proposes a generalized explicit expression of multi-rollers statics, which includes the multi-rollers load sharing (MLS) and thread-pairs load distribution (TLD). The comprehensive contact stiffness of PRSM is calculated and affirmed by the static stiffness experiment. The contact characteristics and axial clearances of thread pairs with eccentric errors (EE) and roller nominal diameter error (RNDE) are analyzed. Furthermore, based on the measured errors of PRSM, the variation laws of MLS with the errors are investigated. The combined effects of RNDE, EE of screw and nut on the MLS are discussed. This study can offer the theoretical guidance for the uniform load design of PRSM. [ABSTRACT FROM AUTHOR]

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