Study on planetary roller screw - Comparison of static stiffness and vibration with ball screw.

Experimental Research on Static Stiffness of the Planetary Roller Screw Mechanism

“…Planetary carrier Earlier works on stiffness characteristics of the PRSM have included research on a calculation method for the static stiffness of PRSM [1][2]. In recent years, Jones [3] used a direct stiffness method to construct a stiffness model of the roller screw mechanism.…”

A review of planetary roller screw mechanism for development and new trends

“…Meanwhile, the published development and applications of PRSMs are reviewed. The Parameters Design section present separately the parameter 1 Shaanxi Engineering Laboratory for Transmissions and Controls, Northwestern Polytechnical University, Xi'an, China 2 Hubei Jiangshan Heavy Industries Co., LTD, Xiangyang, China relationships of two typical types of PRSMs and their characteristic to have a better understanding of the connection between them and the optimization of the structural design. Then, after reviewing the achievements related to different contact models of the PRSM, three effective methods from available researches to resolve the locations of contact point and the clearances in axial direction of the system are summarized in the Contact Properties section.…”

“…Because of the complex relationships among thread parameters, gear parameters, process parameters, heat treatment methods, and transmission characteristics during operation, few studies have been conducted on PRSMs. Earlier researches on PRSMs have been primarily classified as the following fields: friction coefficient, 1 static stiffness and inherent characteristics, 2 efficiency and noise level, 3 dynamic load, 4 and dry and liquid lubrications. 5 In the last decade, PRSMs have attracted more and more attention due to new challenges in aerospace and precision machine tools fields.…”

Thermal Analysis of a Ball-Screw System

“…This will cause unstable variation of positioning accuracy and repeatability. Analyses of thermal effect were discussed before [10][11][12][13][14][15]. Thermal expansion of screw along axial direction and temperature variation of screw were measured and the thermal expansion coefficient was thus obtained [10][11].…”

“…Analyses of thermal effect were discussed before [10][11][12][13][14][15]. Thermal expansion of screw along axial direction and temperature variation of screw were measured and the thermal expansion coefficient was thus obtained [10][11]. Thermal couples were used to find out temperature of bearing supports and working plate, a variable fitting methode was also used to estimate thermal expansion [12][13].…”