毕业设计：JX493ZQL型车用发动机曲轴设计.docVIP

JX493ZQL型车用发动机曲轴设计 专业：车辆工程 学号: 摘要 曲轴是所有发动机中的重要零部件之一，它的设计尺寸大小影响着发动机整体机构外形尺寸的大小和重量。如曲柄销直径尺寸对连杆大端尺寸和重量有着直接影响，后者又发过来影响着曲轴箱宽度。曲轴是内燃机曲柄连杆机构的主要传动件，也俗称发动机中的三大运动件之一。曲轴的的功能就是把气缸中所作的功，都传递到活塞连杆上，然后以旋转运动形式进行输出。除此之外，曲轴的工作可靠性和寿命对发动机工作的可靠性和寿命有很大程度的影响。 本文设计主要以JX493ZQL型车用发动机的相关参数作为参考，对曲柄连杆机构的运动规律以及在运动中的受力等问题进行详尽的分析，并对此系列的柴油发动机的曲轴零部件进行了主要的结构设计计算，并对发动机中的曲柄连杆机构进行了有关运动学和动力学的理论分析。 关键词：发动机；曲柄连杆机构；  ABSTRACT Crankshaft is one of the important parts of all engine, its design size also influences the overall dimensions of the engine size and weight. Such as the crank pin diameter size have a direct impact on the connecting rod big end size and weight, which in turn sent affects the width of the crankcase. The crankshaft internal combustion engine crank connecting rod mechanism is the main transmission parts, also commonly known as one of the three moving parts of the engine. The crankshaft is the function of the cylinder made in the work, all is passed on to the piston connecting rod, and output in the form of rotary motion. In addition, the working reliability and life of engine crankshaft working reliability and life expectancy has great influence. Designed mainly JX493ZQL type related parameters of vehicle engines for reference, to the movement rule of crank connecting rod mechanism and the detailed analysis of the force in the movement, and this series of diesel engine crankshaft parts to carry on the design and calculation of main structure, and the engine crank connecting rod mechanism of the kinematics and dynamics analysis of the theory. Key words: Engine；Crankshaft-Connecting Rod Mechanism； The crankshaft. 摘　　要 ABSTRACT 第一章 绪论 1 1.1 本课题的目的及意义 1 1.2柴油机曲轴设计的背景 1 1.3国内外研究的现状和发展趋势 2 第二章 JX493ZQL曲轴的设计 3 2.1 JX493ZQL曲轴的结构形式设计 3 2.2 JX493ZQL曲轴的材料选择 4 2.3 曲轴的疲劳损坏形式 4 2.4曲轴的设计要求 4 第三章 JX493ZQL曲轴尺寸的计算和结构细节设计 5 3.1 曲柄销的直径和长度 5 3.2 主轴颈的直径和长度设计 5 3.3 曲柄的尺寸设计 5 3.4 平衡重的设计 6 3.5 油孔的位置和尺寸 6 3.6 曲轴两端的结构确定 6 3.7 曲轴的止推 6 3.8润滑油道的布置 7 第四章 JX493ZQL曲轴的疲劳强度校核 9 4.1 作用于单元曲拐上的力和力矩计算 9 4.1.1 计