2-1汽车专业英语课件讲解.ppt

Unit 2-1Main Components of Engine Contents Pre-questions Pre-questions What impression of the engine? Pre-questions What are there types of the engine? electric motors, steam engines, and internal combustion engines What’s the internal combustion engine? burns fuel within the cylinders and converts the expanding force of the combustion into rotary force used to propel the vehicle. Pre-questions what is the power source of automobile and how to produce? Pre-questions The engine comprises two mechanism and five systems, what are they ? crankshaft and connecting rod mechanism, valve gear, cooling system, lubricating system, fuel system, starting system, ignition system Pre-questions What’s the function of the crankshaft and connecting rod mechanism? Its function is to convert heat energy into mechanical energy used to drive the vehicles. II. Text Explanation The internal combustion engine, as its name indicates, burns fuel within the cylinders and converts the expanding force of the combustion into rotary force used to propel the vehicle. 译文：内燃机，顾名思义，就是燃料在气缸内部燃烧，并且把燃烧时的膨胀力转化为驱动车辆的旋转力。 II. Text Explanation Of all automobile components, an automobile engine is the most complicated assembly with dominant effects on the function of an automobile. complicated [?k?mplikeitid] adj.复杂的, 难解的 dominance [?d?m?n?ns] n.优势, 统治 译文：汽车发动机是一切汽车部件中结构最复杂，对汽车功能起支配作用的一个总成。 II. Text Explanation Its function is to convert heat energy into mechanical energy used to drive the vehicles. Convert……into….. 转变；变换 译文：它的作用就是将热能转换成机械能用来驱动汽车 。 II. Text Explanation Convert…..into…. ①转变；变换 That building has been converted into a school. 那座楼房改成学校了。 ②兑换 I want to convert some Hong Kong dollars into American dollars. 我想把一些港元换成美元。 ③改变信仰、党派或意见等 She managed to convert him to her opinion. 她终于设法说服了他接受她的意见。 II. Text Explanation Power is produced by the linear motion of a piston in a cylinder. linear [? lini?] adj. 线的, 直线的, 线 性的 piston [? pist?n] n.活塞 II. Text Ex