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产品的ＣＡＤ从设计质量和开发周期上大大增强了产品竞争能力。该文介绍了清华大学为唐山齿轮厂开发的汽车变速器ＣＡＤ系统、以轴为零件信息载体的变速器系统优化设计、在支撑软件基础上实现变速器零、部件三维模型参数化生成的方法。通过文件系统将二者集成，构成完整的变速器ＣＡＤ系统。本系统的应用，有效地支持了变速器的开发。
Product CAD from the design quality and development cycle greatly enhance the product competitiveness. This paper introduces the CAD system of automobile transmission developed by Tsinghua University for Tangshan Gear Factory. The transmission system with shaft as the part information carrier is optimized. Based on the supporting software, the parametric method of generating the three - dimensional model of the transmission and the parts is realized. Through the file system to integrate the two to form a complete transmission CAD system. The application of this system has effectively supported the development of transmission.