Load distribution of planetary roller screw mechanism and its improvement approach

A model of load distribution over threads of planetary roller screw mechanism (PRSM) is developed according to the relationships of deformation compatibility and force equilibrium. In order to make the applied load of PRSM uniformly distributed over threads, an improvement approach is proposed, in which the parameters of thread form of roller and nut are redesigned, and the contact conditions of roller with screw and nut are changed to compensate the axial accumulative deformation of shaft sections of screw and nut. A typical planetary roller screw mechanism is taken as example to analyze the load distribution, and the effects of installation configurations, load conditions and thread form parameters on load distribution are studied. Furthermore, the improvement approach is applied to the PRSM, and it is proved to be beneficial to reach uniform load distribution over threads.

[1]  Yousef Hojjat,et al.  A comprehensive study on capabilities and limitations of roller–screw with emphasis on slip tendency , 2009 .

[2]  Best Precision.  Calculation of load distribution of planetary roller screws and static rigidity , 2011 .

[3]  T. A. Haskew,et al.  Dynamic load testing of roller screw EMAs , 1996, IECEC 96. Proceedings of the 31st Intersociety Energy Conversion Engineering Conference.

[4]  Geng Liu,et al.  Optimal Design and Contact Analysis for Planetary Roller Screw , 2011 .

[5]  Pei Zheng,et al.  Research on Contact Strength between Roller Screw Pair on Hoisting Mechanism Applied in Deep Sea Crane , 2013 .

[6]  Hao Luo,et al.  Study on Axial Contact Deformation of Planetary Roller Screw , 2012 .

[7]  Y Nosé,et al.  Control system modification of an electromechanical pulsatile total artificial heart. , 2008, Artificial organs.

[8]  K. Johnson.  Contact Mechanics: Normal contact of elastic solids – Hertz theory , 1985 .

[9]  T. A. Harris,et al.  Essential Concepts of Bearing Technology , 2006 .

[10]  Steven A. Velinsky,et al.  Contact Kinematics in the Roller Screw Mechanism , 2013 .

[11]  P. C. Lemor,et al.  The roller screw, an efficient and reliable mechanical component of electro-mechanical actuators , 1996, IECEC 96. Proceedings of the 31st Intersociety Energy Conversion Engineering Conference.

[12]  Shangjun Ma,et al.  A Frictional Heat Model of Planetary Roller Screw Mechanism Considering Load Distribution , 2015 .

[13]  Geng Liu,et al.  Kinematics of Planetary Roller Screw Mechanism considering Helical Directions of Screw and Roller Threads , 2015 .

[14]  Shangjun Ma,et al.  A New Study on the Parameter Relationships of Planetary Roller Screws , 2012 .

[15]  Matthew H. Jones,et al.  Stiffness of the Roller Screw Mechanism by the Direct Method , 2014 .

[16]  Steven A. Velinsky,et al.  Kinematics of Roller Migration in the Planetary Roller Screw Mechanism , 2012 .

[17]  Baeksuk Chu,et al.  Kinematics and Efficiency Analysis of the Planetary Roller Screw Mechanism , 2009 .

[18]  J. Barbera,et al.  Contact mechanics , 1999 .

[19]  Jan Ryś,et al.  THE COMPUTATIONAL MODEL OF THE LOAD DISTRIBUTION BETWEEN ELEMENTS IN A PLANETARY ROLLER SCREW , 2014 .