Analysis And Design Of Transmission Precision For Planetary Roller Screw Mechanism

With the in-depth application of smart equipment in various industries,the performance requirements of its moving parts are getting higher and higher.Planetary roller screws have been closely watched by scholars in various industries because of their high speed,high precision,high load and many other advantages.They have broad application prospects in precision instruments,medical equipment,weapons,aerospace and other fields.However,the domestic research on planetary roller screws is still in its infancy,and the basic theoretical research is not deep enough,resulting in its domestic production and application is not ideal.To this end,this article starts from the parameter design of the planetary roller screw,and conducts research on its transmission accuracy,error distribution and accuracy design.The main research works in this dissertation are as follows:1、Based on the principle of kinematics,the basic conditions for planetary roller screws to meet the correct motion are given.The relationship between the structural parameters of screw,nut,roller and nut displacement is derived,and the design methods and parameters of each component are summarized.Process,and based on Solid Works,the planetary roller screw was modeled and assembled.2、Based on the transfer matrix method of mechanism position analysis,an error analysis model of the planetary roller screw system is established,and the influence of structural parameters and various errors on the transmission accuracy is analyzed.The results show that the thread lead error has the greatest impact on the transmission accuracy of the mechanism.In addition,the transmission accuracy of the mechanism can be improved by reasonably arranging the error phase,reducing the thread pitch and increasing the thread diameter.3、Based on Monte Carlo simulation,the distribution of planetary roller screw transmission error considering deformation is discussed,and the influence of each error randomness on the transmission error distribution is analyzed.The results show that the randomness of the error amplitude has a great influence on the transmission error distribution of the mechanism,its size determines the maximum transmission error of the mechanism,and the randomness of the error phase angle increases the prediction range of the transmission error of the mechanism.4、Based on Monte Carlo simulation,a mechanism accuracy design method was proposed,and the accuracy of each component of the planetary roller screw was optimized by genetic algorithm.The optimization results show that through different optimization models,the transmission accuracy of the mechanism can be effectively improved under certain conditions,or the manufacturing cost can be reduced.