| Gear transmission is one of the most widely used forms of a basic transmission in modern mechanical transmission, and gear transmission technology has become an important part of the mechanical engineering technology, to a certain extent, it marks the level of mechanical engineering technology. Double circular arc gear transmission having involute gear transmission incomparable characteristics, it has advantages of high carrying capacity, high contact strength of tooth surface, running-good performance, good lubricity, anti-bonding ability, simple manufacturing process, long service life, high transmission efficiency and minimum tooth undercut without restrictions, etc., which has been widely used in petroleum, chemical, metallurgy, coal, mining, electricity and construction and other industries in various mechanical equipment.This paper select GB / T12759-1991 double arc gear to carry on analysis, in order from the subject of double arc gear transmission CAD system design and verification, optimization design, parametric modeling and stress analysis were studied. The main research contents of this paper are listed as follows:(1) Based on software Visual C++ 6.0 on the double arc gear design and verification CAD systems are developed, the system consists of three modules: information input, information processing and information output. Information input module is responsible for the design and check of the double arc gear parts information input; information processing module is responsible for the design of the parameters of the double circular arc gear and check the gear to meet the strength requirements of the process;information output module is responsible for inputting the result of information processing to the screen.(2) The reliability optimization design of double arc gear transmission is carried out. The optimization objective is approximated by the minimum of a pair of double arc gear cylindrical volume; the main gear parameters as design variables; According to the contact strength of tooth surface and tooth root bending strength reliability calculation method of determining the reliability constraints, and the boundary constraint conditions are established, finally, the mathematical model of the double circular arc gear transmission is obtained, and through the MATLAB optimization toolbox to solve the optimization model.(3) Based on the basic profile of the double circular arc gear and the relationship between the parameters of the tooth profile and the modulus, According to the Pro/E parametric function, the 3D model of the double circular arc gear is obtained. The corresponding 3D model can be generated when the user input the basic parameters of the new double circular arc gear. According to the parametric model, In Pro/E, a pair of meshing gears are used for virtual assembly, and the assembly model of interference detection analysis. Finally, it carries on the kinematic analysis and collision detection, detection through this analysis excluded the original assembly model potential for interference.The possible interference in the original assembly model is ruled out through this analytical testing.(4) Based on the finite element analysis software ANSYS, taking into account the limits of the capacity of the computer and the speed of calculation, in this paper, the three tooth model of double circular arc gear is analyzed. The definition of element type, boundary constraint and dividing mesh are defined for the three tooth model, in this paper, the middle tooth is divided into three sections along the tooth width direction, each load is applied research in the paragraphs indented tooth contact zone and contact zone. Three tooth contact model is established,The contact stress of tooth surface is analyzed, and the contact stress of tooth surface is calculated by the contact stress formula of tooth surface and compare the results of the two solutions. |
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