Research On Friction And Wear Theory Of Trigeminal Universal Joint Based On Fractal Theory

With the rapid development of the automotive industry,universal couplings are becoming more and more important as an important transmission component.As a new type of coupling,the trigeminal sliding universal coupling has the advantages of simple structure and good synchronization performance,it has broad application prospects.However,its lack of research in friction,wear and lubrication has greatly slowed its development,Promotion and application in the automotive industry.This paper introduces fractal theory into the research field of trigeminal sliding universal joint for the first time,From the perspectives of theoretical research,numerical simulation,etc.,research and analysis on the contact load,texture lubrication,life prediction and other aspects of the important transmission components of the three-prong sliding universal joint,and on this basis to further innovate part of the structure of the coupling,designed to reduce friction and wear between mating surfaces,extend its service life,and be beneficial to popularization and application.The main research contents of the thesis are as follows:(1)First,briefly introduce the concept and classification of couplings,the research background and research significance of this article,and then explain the research status of trigeminal couplings,the application and research status of fractal theory in rough surface contact,friction,and wear,Finally,the research content of this article is proposed..(2)Analyze the movement of the trigeminal sliding universal joint to obtain the contact characteristics of the sliding pin and the driving shaft hole.Combining the actual contact between the sliding pin and the driving shaft hole,based on the M-B fractal model,a fractal contact model of the sliding pin and the driving shaft hole considering the influence of friction is derived and established.Through MATLAB numerical simulation analysis,the influence of contact length,fractal roughness,fractal dimension,material characteristic parameters,friction factor and hardness on the contact load is obtained.(3)On the basis of cylindrical and spherical fractal theory,combined with Archard wear theory to establish cylindrical and spherical wear fractal models,and verify the rationality of the model through numerical simulation.Analyze the speed and force of the active shaft hole,sliding pin mating surface,and joint bearing,combining speed and force to derive the respective wear life formula,predict their respective life and analyze the influence of various factors on the life of the active shaft hole,sliding pin mating surface,and joint bearing.(4)Further research on the micro-textured anti-wear structure applied to the sliding pin,the focus of the research is on the shape and overall shape of a single micro-pit.The oil film pressure characteristics of various shapes are obtained through simulation analysis,and the optimal results are obtained by comparison.At the same time,the effects of texture parameters and fractal parameters on the pressure and flow factors of the micropits are studied.The results show that the oil film pressure of the circular pit opening and the spherical micro pit is higher,which is more beneficial to lubrication.(5)Study the anti-extrusion structure of the driving shaft hole and the sliding pin,and perform ANSYS finite element contact analysis on the new and old structures,and the relevant stress,contact pressure,and contact state cloud diagrams are obtained.The two results are compared to verify the advantages of the new structure.