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Planetary gear transmission has several advantages, such as large scope of transmission ratio, compact structure, small volume and quality, generally high efficiency, low noise and stable operation, etc. It was widely used in lifting, mining, construction machinery, shipbuilding, aerospace and defense industry sector as the deceleration, speed change or speed-up gear transmission. But there have many types of planetary gear transmission, and the design calculations are complicated, so in order to improve the design efficiency, reduce design errors, and meet the needs of the CAD/CAE/CAM integrated, it have important practical significance to do the researches on modulation design, seriation design, parametric design studies for planetary transmission.The secondary development of three-dimensional software SolidWorks by using VisualBasic6.0 which is an object-oriented developing tool, with the combination of database of Microsoft Access 2003 RDBMS on the storage and management of design parameters, design results, the model parameters. Combine the calculating method of design, the checking of contact strength, and the parametric modeling of series key components of NGW planetary reducer to be a system, make integration with the SolidWorks as plug-in unit. The main research work is as follows:1.Study the design theory of NGW type involute planetary gear transmission, achieve rountinization of design calculations, strength checking and structural parameters design of NGW type planetary gear reducing mechanism based on Microsoft Access 2003 database and VisualBasic6.0 as development tool; Through user interaction design process, system offer recommended transmission series, transmission ratio distribution, distribution of teeth, gear geometry and strength check calculation results, and parts of the structure parameters, after input the initial parameters such as power, speed, the total transmission ratio, life expectancy, transmission efficiency etc.2. Study the parametrization modeling method of NGW type planetary gear reducing mechanism’s essential spare part, achieve the feature-based parametric modeling of key components by using application programming interface (API) of the computer-aided design (CAD) software SolidWorks, which provides parametric modeling function. Model the new three 3D model which the production designers design by only changing the components main parameter to renew the model size, through parameter driving parametric method, or parameter driving and program driving combination’s parametric method; Modeling position accurate assembly parts parametric model of planetary gear reducing mechanism, timely feedback strengths and weaknesses of the design results, provide a reference advice for improving the design results.3. Redeveloping Dynamic Link Libarary (DLL) file of SolidWorks, Makes planetary gear reducing mechanism automated design system as SolidWorks plug-in unit. The DLL realizes the seamless integration with SolidWorks, which can solve the problem of design calculations and three-dimensional modeling data from mutual.NGW planetary gear reducing mechanism automated design system enables users to quickly interactive design environment, reducing of duplication of tedious calculations and modeling, significantly improves design efficiency and reliability, significantly reducing design cycle.
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