活塞毕业设计.docVIP

摘要 本设计说明书主要包括五个部分：总体设计，热力计算，动力计算，专题设计。 相对汽油机而言，柴油发动机具有燃料经济性好、热效率高，工作可靠、耐久性好、功率范围广、防火安全性好等优点，因而其应用更为广泛，设计发展的潜力大。 发动机的工作可靠性和使用耐久性，在很大程度上与活塞组的工作情况有关。而活塞的工作环境恶劣，因此设计出符合工作条件的活塞具有重要的意义，也是本次设计的重点。 本设计说明书首先简单介绍了发动机的结构、主要参数、整机布局、主要零部件的结构及主要附件的规格。根据设计任务的技术要求分别做了热力计算和动力计算。通过参数的选择、计算和编程，得到的油耗率、功率和扭矩图等都符合设计要求。 在活塞的专题设计部分，先分析活塞的工作条件，然后根据活塞的工作条件进行材料的选择和活塞的尺寸设计，在这部分还包括燃烧室设计等，对活塞的的强度计算表明，活塞的一些尺寸参数的选择是合理的。 关键词：柴油机 活塞 设计 热力计算 动力计算 Abstract The design specification includes five parts： collectivity design, thermodynamic calculation, dynamic calculation, subject design. Compared to gasoline engine, diesel engine has the benefits of good fuel economy, high thermal efficiency,working reliablely, good durability, wide range of power,good fireproofing and so on. Hence its application more wider, and its design is great potential for development. The work reliability and the use of durability in the engine is relation to the work of the Piston group.But the piston’s working environment is very poor,so it is a great significance to designe a piston which can meet the conditions of work.And it is an emphases in this design. The design specification first introduces the engine’s frame, the main parameters, engine layout, the structure of major parts and the specifications of the annex. In order to check the technical requirements of the design task the thermal and dynamic calculation were done in this specification. Through the parameters choice、calulation and programme,it showed that the fuel consumption、power and torque map were all accorded with the design requirements. In the pistons’ topic design,we first analysis of working conditions of the piston. According to the working conditions of piston , we select materials and design the size of piston. In this part also includes the combustion chamber design and the strength of piston s calculation shows that the pistons parameters chosen in the specification is reasonable. Keywords :diesel engine piston thermal calculation dynamic calcul