分段变形椭圆齿轮共轭对传动性能研究
[Abstract]:Segmented deformed elliptical gears have the advantages of high transmission efficiency, large torque and compact structure, and can also realize variable transmission ratio motion and variable speed ratio movement. They are used in various kinds of machinery, such as machine tools, agricultural machinery, pumps, etc. It has a broad application prospect. In this paper, the polar coordinate expression of segment curve of multi-segment deformed elliptic gear is given, the joint curve expression of common gear is given, and the polar coordinate expression of two-stage and three-segment deformed elliptic gear is given. It lays a foundation for the subsequent geometric modeling and analysis and calculation as well as for the design and machining of segmented deformed elliptical gears. The mathematical models of rack cutter and gear shaper cutter are established respectively. Through the secondary development of Solidworks, the position of tooth cutter is controlled by VBA language, and the elliptical gear billet with segmental deformation is cut off, and the three dimensional model is obtained. The force of the gear pair is analyzed, the force of the whole gear pair is analyzed first, then the force of the single gear is analyzed, and the force of the gear tooth is obtained, which lays the foundation for the strength check of the gear. Combined with the strength analysis method of cylindrical gear, the formula of bending stress and contact stress of elliptical gear with segmental deformation is obtained by modifying it. This method is quick, but the accuracy is not high. The results show that the maximum bending stress is 5.72e7Paat 伪 = 90 掳, and the maximum contact stress is 4.8e6Paat 伪 = 15 掳. The results of single-tooth meshing and multi-tooth meshing are on the large side, but in designing and checking the bearing capacity of gears, this research provides a faster and less computational method. The kinematic properties of segmented deformed elliptical gears are analyzed, and the influence of structural parameters on angular velocity and angular acceleration is studied. The results show that the greater the eccentricity, the greater the angular velocity and angular acceleration of the driven gear, the more stable the gear transmission is when the deformation coefficient is 1, the bigger the deformation coefficient deviates from 1, the greater the angular velocity and the angular acceleration change. When the gear segment number is more than 3 segments and the deformation coefficient of each segment is different, the acceleration of the drive wheel will have a sudden change. This analysis provides the basis for the design of suitable gear system. The geometric model of single segment deformed elliptical gear and gear pair is established by using Solidworks software, UG (Unigraphics) and ADAMS software and the corresponding finite element model is established in ANSYS Workbench software. The inherent characteristics of a single gear, including the first six natural frequencies and modes, are analyzed, and the natural frequencies of gear pairs in different meshing positions are analyzed. The range of natural frequencies is obtained, and a method for modal analysis of gear pairs is provided. By studying the inherent vibration characteristics of gears which can be accurately analyzed, it can lay a foundation for structural optimization and noise control.
【学位授予单位】:安徽工程大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TH132.41
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