Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 340437, 29 pages
Research Article

A New Study on the Parameter Relationships of Planetary Roller Screws

School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China

Received 15 June 2012; Accepted 3 October 2012

Academic Editor: Slim Choura

Copyright © 2012 Shangjun Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


As a more powerful transmission device, planetary roller screws (PRSs) recently have received more attention, compared to conventional ball screws. However, due to the complicated and unclear relationships among the PRS components’ parameters, it is difficult to design high-quality PRSs. To facilitate the PRS design, a new study on the parameter relationships of PRS is conducted in this work. New models of the axial stiffness and the frictional moment of PRS are developed, and the relationships of the axial stiffness and the frictional moment in terms of contact angle, helical angle, and tooth number of the roller thread are investigated. This study could contribute to the research of PRS to improve its transmission performance, especially to increase its positioning accuracy.