行星滾柱絲杠副剛度及效率的分析與研究
[Abstract]:The planetary roller screw pair is widely used in various precision linear transmission and large thrust transmission occasions because of its high speed, heavy load, high efficiency, long working life and so on. Will gradually replace ball screw as the first choice parts of high-precision heavy-duty linear transmission. However, due to the fact that the development of planetary roller screw is still in its infancy and many basic theories are not perfect, this paper mainly analyzes the stiffness, friction and efficiency of planetary roller screw. The main influencing factors are discussed, which provides a theoretical basis for product structure optimization design and serial development. In this paper, the contact deformation of the planetary roller screw pair is modeled and numerically analyzed by Hertz theory and fractal theory respectively, and the results of the two theories are compared. Secondly, considering the torsional deformation and axial tension deformation of the lead screw, axial tension deformation, contact deformation, thread deformation and so on, the load distribution of the planetary roller screw is modeled and calculated. The axial static stiffness is analyzed and calculated, and the factors influencing the axial static stiffness, such as the way and magnitude of pretightening force, spiral rising angle, contact angle and so on, are analyzed. Then the friction mechanism of the planetary roller screw pair is studied, and the influencing factors such as preload, manufacturing error and lubrication characteristics are discussed. Finally, the mathematical model and calculation of its efficiency are carried out. At the same time, the main influencing factors such as spiral angle and contact angle are analyzed. The innovation of this paper lies in: applying fractal theory to realize the mathematical modeling and analysis of the contact stiffness of the planetary roller screw pair, and comparing the results with the contact stiffness model based on Hertz theory; The axial static stiffness, friction force and efficiency of the planetary roller screw pair are modeled and numerically calculated, respectively, and the influencing factors are discussed. The research results of this paper provide a certain theoretical basis and reference value for the structure optimization analysis, product development and application of the planetary roller screw pair, and lay a foundation for the further study of the basic theory of the planetary roller screw pair.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2011
【分類號】:TH136
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