拖拉机与汽车培训课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,00:16:43,第二章 发动机原理与构造,拖拉机与汽车,2,00:16:43,典型发动机的组成,3,00:16:43,第一节 内燃机工作原理,4,00:16:43,1.,内燃机工作过程,a.,5,00:16:43,6,00:16:43,内燃机的,P,-,示功图,b.,示功图,7,00:16:43,8,00:16:43,增压和非增压内燃机的,P-V,示功图,单缸指示功,9,00:16:43,2.,内燃机的分类,10,00:16:43,11,00:16:43,12,00:16:43,13,00:16:43,14,00:16:43,15,00:16:43,1.,内燃机的认识,奔驰,V6,发动机,3.,内燃机的认识,16,00:16:43,BMW_7_Series_760b,发动机拆解图,17,00:16:43,部分组装的发动机,BMW_7_Series_760,18,00:16:43,4125,柴油机,19,00:16:43,4.,内燃机结构与原理,20,00:16:43,21,00:16:43,22,00:16:43,23,00:16:43,燃烧和表面点火,24,00:16:43,5.,内燃机总体构造,25,00:16:43,26,00:16:43,27,00:16:43,28,00:16:43,29,00:16:43,30,00:16:43,31,00:16:43,32,00:16:43,33,00:16:43,6.,内燃机产品名称及型号编制规则,34,00:16:43,第二节 曲柄连杆机构,35,00:16:43,气缸体、连杆活塞组、曲轴飞轮组,将往复运动转换为圆周运动,从运动分析入手，分析工作压力和惯性力分析动力平衡关系。,36,00:16:43,活塞连杆组,气缸体,曲轴飞轮组,37,00:16:43,x,活塞位移,曲轴转角,连杆摆角,曲轴旋转角速度,R,曲柄半径,l,连杆长度,e,偏心距,38,00:16:43,动力学分析,39,00:16:43,单缸发动机往复惯性力的平衡,40,00:16:43,单缸发动机离心惯性力的平衡,41,00:16:43,多缸机的平衡,离心惯性力及力矩的平衡,往复惯性力及力矩的平衡,着火次序,42,00:16:43,43,00:16:43,飞轮与转动惯性,发动机运转是输出扭矩呈周期性变化。,发动机能够正常工作的必要条件是驱动力矩大于阻力矩。,实际上发动机自身的驱动力矩常常小于阻力矩。,储能？飞轮,转速提高,转速降低,