Journal of South China University of Technology (Natural Science Edition) ›› 2021, Vol. 49 ›› Issue (9): 135-144.doi: 10.12141/j.issn.1000-565X.210291

Special Issue: 2021年流体动力与机电控制工程

• Fluid Power & Electromechanical Control Engineering Special • Previous Articles    

Stress Cycle Behaviors of Planetary Roller Screw Mechanism Based on Kinematic Analysis

YAO Qin1,2 LIU Yongshou2 MA Shangjun3 ZHANG Mengchuang4,5   

  1. 1.School of Mechanical Engineering，Suzhou University of Science and Technology，Suzhou 215009，Jiangsu，China；
    2.School of Mechanics，Civil Engineering and Architecture，Northwestern Polytechnical University，Xi'an 710129，Shaanxi，
    China；3.Shaanxi Engineering Laboratory for Transmissions and Controls，Northwestern Polytechnical University，Xi'an 710072，
    Shaanxi，China；4.School of Civil Aviation，Northwestern Polytechnical University，Xian 710072，Shaanxi，China；
    5.Yangtze River Delta Research Institute of NPU，Taicang 215400，Jiangsu，China
  • Received:2021-05-10 Revised:2021-07-23 Online:2021-09-25 Published:2021-09-01
  • Contact: 姚琴(1990-)，女，博士，主要从事行星滚柱丝杠副、结构可靠性分析与设计优化等的研究。 E-mail:yaoqin@mail.nwpu.edu.cn
  • About author:姚琴(1990-)，女，博士，主要从事行星滚柱丝杠副、结构可靠性分析与设计优化等的研究。
  • Supported by:
    Supported by the National Natural Science Foundation of China (51875458, 51905428)

PDF

194

Abstract: The movement and force transmission of planetary roller screw mechanism （PRSM） are realized by the planetary motion of multiple rollers and the meshing of their helical surfaces between the screw and the nut.Based on the characteristics of spatial helical surface of screw，nut and roller，the kinematic analysis model of PRSM is established by using the parametric equations of the screw，nut and roller in this paper.The positions of contact points are obtained according to the principle of continuous tangency.Then，the relationship between the structu-ral parameters of PRSM is deduced from the kinematics characteristics of the contact points.On this basis，the spatial motion trajectories of the screw，nut and roller are simulated，and the stress cycle behaviors on their threads are further obtained.Furthermore，the working life of the PRSM is predicted.The results show that there is a relative velocity at the contact point of the screw and roller，and the contact point of the nut and roller is the instantaneous center; and that each specific contact point on the roller and nut bears stable pulsating cyclic contact stress，while each specific contact point on the screw is subjected to cyclic contact stress with periodic amplitude variation.

Key words: planetary roller screw mechanism, space helical surface, kinematic analysis, stress cycle

CLC Number: