雙嚙合針齒凸輪分度機構(gòu)的結(jié)構(gòu)優(yōu)化及有限元分析
[Abstract]:Double meshing needle cam indexing mechanism is a new type of intermittent mechanism. Its input shaft, needle tooth shaft and output shaft are three axis collinear. It has the advantages of simple and compact structure, large load, large indexing and stable transmission, etc. Therefore, its application prospect will be quite extensive. In this paper, based on the existing prototype, the meshing efficiency of the mechanism is theoretically analyzed, and then the volume of the internal structure and the average transmission efficiency of the mechanism are optimized by genetic algorithm. The fatigue simulation of the inner cycloid wheel and cam, the key parts of the prototype, and the dynamic analysis of the mechanism are also carried out. Firstly, according to the profile equation of the cam and the inner cycloid wheel, the relative sliding velocity between the needle tooth and the inner cycloid wheel and the cam is analyzed and solved by considering the influence of friction. Combined with the actual transmission of the mechanism, the overall transmission efficiency of the mechanism is calculated, the instantaneous meshing efficiency of the mechanism in a indexing period is obtained, and the main parameters affecting the average efficiency of the mechanism are analyzed. Secondly, taking the volume of the internal structure of the prototype and the average meshing efficiency of the mechanism as the optimization objectives, according to the geometric characteristics of the mechanism and the transmission principle, the Rz1,Rz2,e,Bng,Btg,Bzg is determined as the design variable. On the basis of meeting the requirements of strength and so on, the constraint conditions are established, and the multi-objective optimization model of the mechanism is established. The genetic algorithm is used to solve the model. Thirdly, according to the fatigue properties of the material, the fatigue life of the inner cycloid wheel and cam of the mechanism is predicted by the finite element analysis method, and an improved scheme is given to solve the problem that the safety factor of the cam is small and the design life is not reached. Finally, the equivalent dynamic model is established, and the equivalent total equivalent torsional stiffness curve of the cam and the cycloid wheel in the mechanism is solved and analyzed, and the range of the instantaneous natural frequencies of the cam and the inner cycloid wheel is given. The modal analysis of the whole machine is carried out by using Workbench, and the vibration modes under each mode are studied, and the possibility of resonance between the inner cycloid wheel and the cam and the system vibration is predicted.
【學(xué)位授予單位】:天津科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TH112.2
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