Study On The Equivalent Elliptical Harmonic Gear Drive

At present, we have a commitment to the issue of civilian gear design, research and development needs of a small size, long-life, high load carrying capacity harmonic gear reducer, the transmission reliability, weight, volume, return difference sional rigidity and dynamic performance, and so put forward a very high demands.China's current cup-shape flexspline harmonic gear drive device, bigger size of axial,can not meet the requirements of the installation space;the current cup-shape soft flexspline harmonic gear drive device, although the smaller size of axial, not To avoid the stress brought about by a sharp increase, leading to its load carrying capacity is low.To this end Professor Liang Xichang in the harmonic drive on the basis of a new type of intellectual property rights harmonic gear reducer - the equivalent elliptical harmonic gear reducer (patent application number: 200610095286.1).Based on this patent on the basis of a design to meet the design requirements of the new harmonic gear reducer, in the harmonic gear reducer drive innovation and the structure of the theory, based on the ADAMS dynamic simulation, based on the ANASYS finite element analysis Carried out a systematic analysis and study. The main content of this article can be summarized as follows:1,The system description and analysis of the harmonic drive technology development, research, trends, and the advantages and disadvantages of several new types of harmonic gear, as well as the characteristics of existing products at home and abroad compared with the performance gap based on the project for gear In the installation space, life expectancy, carrying capacity in areas such as the harsh requirements of the proposed research, design, development of new harmonic drive of the main contents of the device.2,Introducing the principle of harmonic gear reducer, body movement analysis; use of the ring shell theory of deformation of the soft round of the mathematical model has been deformed after the soft curve of the round of the equation;has been to avoid interfering in the mesh size should meet the conditions; sum has been designed mesh geometry calculation steps, has been able to call directly to the harmonic gear reducer design of Excel Calculation forms.3,New harmonic gear reducer - the equivalent elliptical gear reducer harmonic structure of the program; and obtained by the use of the Excel spreadsheet for calculating the equivalent harmonic gear reducer oval mesh size and geometry of parts of the structure size Design calculations.4,Interference from the engagement, drive efficiency, force, strength and stiffness on the design of the harmonic equivalent elliptical gear reducer theoretical analysis, have been designed by reducer will be no interference in theory, the transmission efficiency of up to 90.3 %, Strength and stiffness of satisfying the requirements.5,The use of three-dimensional design software Pro / Engineer equivalent to the oval gear reducer of the harmonic components for solid modeling, and a virtual assembly analysis and interference, has been designed by the reducer and the whole process of dynamic movement does not occur To interfere in order to verify the correctness of the theory analysis.6,The equivalent of the harmonic gear reducer PRO / E model be inported into the assembly established in ADAMS virtual prototype model, and its dynamic simulation analysis, among all components of the transmission speed, acceleration and power simulation curve Map, and these were carried out simulation curve analysis, obtained by the use of simulation curve for the corresponding institutions to deal with quantifiable be the equivalent moment of inertia, and then these results with the calculated data were compared. Finally, on the virtual prototype model of dynamic geometric simulation, has been in the process of movement on the soft round shape with the gear change and dynamic engagement between the animation process.7,Introduced the ANSYS software and its new generation of ANSYS Workbench products, the application of ANSYS Workbench Flexspline modal analysis to be carried out Flexspline natural frequency and vibration mode,for Sophie round of improvements designed to provide a basis; reducer and then on the drive components bearing structure of the static finite element analysis of the load displacement deformation, stress and so on, the maximum principal stress, minimum principal stress and the largest tooth Equivalent stress the value of the map. According to the Saint-Venant theorem on the reducer can be simplified, the system automatically contacts the definition, bound to add a fixed machine-building mode finite element analysis model, the model of the first 12 natural frequencies and mode shapes are calculated.