| Gear transmission has lots of characteristic, such as power transmission range, high efficiency compact structure, reliable operation, long service life and transmission stability. Therefore gear transmission technology is widely used in automobiles, engineering machinery, machine tools, wind power generation equipments and so on. In mechanical driving devices, gear performance and life directly influence the performance and reliability of the mechanical and electrical product. In recent decades gear design and manufacturing technology has greatly improved, and gear transmission of various tooth line form successively appeared,such as involute spur gear, helical gear, herringbone gear etc. But the vibration and noise of cog-wheel gearing restricts the development of gear transmission technology. So it is very necessary to improve the study of gear pair transmission stationarity.Whatever people use the exact standard involute tooth shape curve (for example cycloid, arc or other curve), and improve the installation precision, the elastic deformation in the influence of gear meshing momentum still exist, which makes gear pair conjugate relation of the static conjugated along the meshing line destroyed, inevitably cause vibration and noise, and affects the stationarity and service life of the gear transmission. So this paper is focused on the research of the gear tooth meshing elastic deformation that impact gear transmission stationarity by calculation elastic deformation, and uses the measures of the comprehensive modification to improve gear transmission quality.This paper analyzes the characteristics of meshing gear pair and centres on calculation method of the gear elastic deformation by the use of related knowledge of material mechanics and differential geometry,in order to deduce more concise calculation formula. This paper alse finds that gear elastic deformation can lead to base section error, causing meshes into the impact and meshes out impact. Considering the elastic deformation of gear transmission process and installation error of the actual working condition, this paper puts forward a new kind of repairing fractal method—the comprehensive modification, and deduces the related calculation formula of modification parameters based on the straight tooth for example. On this above basis, this paper focuses on the research and derivation the calculation of elastic deformation and comprehensive modification parameters of arc tooth cylindrical gears. At the same time, through the finite element method that considers the transmission state of gear pair in the actual working condition,the strain and stress of straight tooth, arc tooth before and after comprehensive modification are analyzed,which verifies the comprehensive modification can improve the stress state of gear tooth surface.To take the elastic deformation as our starting point,this paper not only can solve the errors of the base section caused by the impact of the elastic deformation and can effectively reduce the meshing impact caused by installation error,by putting forward this new kind of modification method——comprehensive modification.Comprehensive modification can effectively reduce the impact of gear tooth shape meshes into meshes out in order to ensure smooth transition in this process of gear meshing. To believe that with the deepening of the research work, modification parameters will be constantly improved. In actual gear pair transmission process,comprehensive modification to reduce meshing impact has obvious advantages, which is beneficial to the ascension of the drive steadiness. |
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