| The load-bearing performance of the ball screw mechanism and planetary roller screw mechanism is the basis for studying other properties,and the transmission efficiency is an important indicator of the service performance of the two.This subject is supported by a cooperation project between the laboratory and a research institute of China Shipbuilding Industry Corporation,and conducts theoretical and experimental research on the bearing and transmission efficiency of the ball screw mechanism and planetary roller screw mechanism.It is the design and production of the domestic screw mechanism,Use and improve to provide theoretical basis and experimental basis.The specific research content is as follows:(1)The process error is added to the deformation coordination relationship between the ball of the ball screw,the screw raceway and the nut raceway to obtain a bearing model that is more in line with the actual situation,and then analyze the ball screw under different axial loads and process errors.The bearing capacity of the ball screw is determined,and the process error is substituted into the motion relationship,and finally the bearing capacity and motion of the ball screw are obtained.(2)The process error is added to the deformation coordination relationship between the roller thread of the planetary roller screw,the screw thread and the nut thread,so as to obtain a bearing model that is more in line with the actual situation,and then analyze the situation under different axial loads and process errors.The bearing condition of the lower planetary roller screw,and the process error is substituted into the motion relationship,and finally the bearing and motion condition of the planetary roller screw is obtained.(3)According to the Hertzian contact theory and the elastohydrodynamic lubrication theory,combined with the load-bearing and motion conditions of the ball screw and the planetary roller screw,analyze the ball screw and the planetary roller screw.The lubrication condition of the contact surface is obtained,and then the friction coefficient and friction torque model are obtained.Aiming at the limitations of the traditional model of transmission efficiency,a new transmission efficiency model is established,the new and old models are calculated and compared,and the influence of different axial loads,rotational speeds,process errors and lubricant viscosity on transmission efficiency is analyzed.(4)By designing the test plan and carrying out the transmission efficiency test,the transmission efficiency test data of the ball screw and the planetary roller screw under different working conditions are obtained,and the experimental data,the calculation data of the new model and the calculation data of the transmission model are compared,and it is pointed out that The limitations of traditional mathematical models,verify the validity and rationality of the new model,and find out the shortcomings of the new model.Finally,the law of transmission efficiency changes under different working conditions is analyzed and summarized. |
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