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摘要 曲轴是汽车发动机中最重要的部件之一,是发动机的脊柱,是承受冲击载荷、传递动力的关键零件。曲轴的性能除与曲轴本身、强化工艺有关外，还与轴承的工作情况、整个曲轴系的扭转振动的情况都有密切的关系,因此曲轴的设计不是一个单纯曲轴本身的问题,如何即保证设计功能,又同时兼顾轴承、扭转振动性能、前后端连接的强度，在曲轴设计时缺一不可。任何分析、计算的缺失，都有可能造成曲轴系统的可靠性和整机性能出现问题。本文结合详细阐述了发动机曲轴的整个设计过程，并对其疲劳强度进行了校核。本毕业设计课题的研究与实施，应用和加深了本科学习期间的大部分理论知识，还获得了很多新的理论知识，更重要的是将理论与工程设计紧密结合，增强了分析问题和解决问题的能力，对知识的综合运用和解决工程中的实际问题，在能力上获得了很大的提高，并得到了全面的锻炼。关键词：汽车发动机，曲轴，校核Abstract The crankshaft is one of the most important components in the automobile engine is the engine of the spine is exposed to impact load, the transmission of power key parts. In addition to the crankshaft itself, strengthen the process related, the performance of the crankshaft and the bearing, the torsional vibration of the crankshaft system have a close relationship, therefore crankshaft design is not a simple crankshaft itself is the problem, how that is guaranteed by design function, but also taking into account the bearing, torsional vibration performance, the strength of the front-end and back-end connections, are indispensable in the design of the crankshaft. Any analysis to calculate missing, may have resulted in the crankshaft system reliability and performance of the whole problem. In this paper, elaborated throughout the design process of the engine crankshaft, check and fatigue strength.The study and implementation of the graduation project, application and deepened during most of the theoretical knowledge of undergraduate study, also received a lot of theoretical knowledge, more importantly, in close connection with the theory and engineering design, and enhance the analysis of the problem and solve the problemcapabilities, integrated use of knowledge, and solve practical problems in engineering, the ability to obtain