| With the development of industry,in the petroleum,coal and other industries need heavy duty,high speed,high power transmission demand,double arc gear transmission has the advantages of strong bearing capacity,large bending strength,long service life and so on.At the same time in some specific occasions need the gear to realize the nonlinear,changing master slave driving mechanism transmission relationship,and the elliptical gear mechanism compact,smooth transmission,at the same time,it can also transfer power and variable transmission ratio movement,in the transmission process is easier to achieve the accuracy of the transfer movement and high-speed heavy load under the smooth transmission.In this paper,the double circular arc tooth profile is combined with elliptical gear,the three-dimensional model is established and its motion characteristics are analyzed,and then the contact stress is studied and the fatigue life is analyzed.The double circular arc elliptical gear pair is designed to be used in heavy industry,petroleum industry,mechanical engineering and other industries.The main research contents are as follows:1.Based on the meshing principle of the double-arc gear,the tooth surface conjugate principle of the double-arc gear is derived from the tooth surface equation of the double-arc gear,and then the shape of the gear studied in this paper and the basic parameters of the double-arc elliptical gear are determined according to the driving wheel and slave wheel pitch curve equation of the second-order elliptical gear.After that,the three-dimensional model of the gear is modeled in the three-dimensional modeling software.It lays a foundation for the subsequent research on the kinematic characteristics and contact characteristics of gears.2.According to the established three-dimensional model of the double-circular elliptic gear,the kinematics characteristics of the double-circular elliptic gear were analyzed,and the meshing force of the double-circular elliptic gear and the influence of the spiral Angle on the radial force,tangential force and axial force were investigated when the spiral Angle was 6°,8°,10° and 12°,respectively.The influence law of the spiral Angle on the double-circular elliptic gear was summarized.Then the dynamic meshing characteristics of the double circular arc elliptic gear under different working conditions were investigated.3.After analyzing the kinematic characteristics of the double circular arc elliptical gear,the contact stress of the double circular arc elliptical gear is analyzed by selecting the gear with appropriate helical Angle,and the contact stress of the double circular arc elliptical gear is analyzed by finite element static contact analysis and transient dynamic contact analysis,and the contact stress law of the double circular arc elliptical gear under different parameters is obtained.4.Based on the stress analysis of the double circular arc elliptical gear,the fatigue life analysis of the double circular arc elliptical gear was carried out.According to the fatigue analysis software Ansys n Code Design Life combined with the contact stress analysis results of the double circular arc elliptical gear,two kinds of load spectra were established in the fatigue analysis software to analyze and summarize the fatigue life rules of the double circular arc elliptical gear under static load and dynamic load respectively.Through the study of the above contents,it provides a theoretical basis for the study of the kinematic characteristics and the evaluation of the fatigue life capacity of the double-circular elliptic gear,and provides a reference for the subsequent optimization design of gear teeth and industrial application. |
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