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1、Unit 2-1Main Components of Engine,2,一、发动机的分类,Clissified by fuel（按燃料不同分类）汽油机和柴油机；Clissfiled by working progress（按工作行程分类）四冲程发动机和二冲程发动机；Clissfiled by cooled ways（按冷却方式分类）水冷发动机和风冷发动机；Clissfiled by number of cylinder（按气缸数量分类）单缸发动机和多缸发动机,3,Clissified by fuel（按燃料不同分类）,汽油发动机gasoline enginegasolinegslin n.汽油
2、,点燃方式（点燃式）,4,柴油发动机diesel enginedieseldi:zl n.柴油，柴油机,点燃方式（压燃式）,5,Clissfiled by working progress（按工作行程分类）,二冲程发动机Two stroke enginestrokestrk n.冲程，行程；,活塞反复运动一次，曲轴转动一周，两个冲程完成一个工作循环。,6,四冲程发动机Four stroke enginestrokestrk n.冲程，行程；,活塞反复运动两次，曲轴转动两周，四个冲程完成一个工作循环。,7,水冷却式发动机Water coolest engine,水箱，通过水泵作用，水通过水道流通
3、整个汽缸体，进行降温。,8,风冷却式发动机air coolest engine,风冷，通过空气气流与风扇作用，空气/风通过发动机整个汽缸体，进行降温。,9,Clissfiled by number of cylinder（按气缸数量分类）,单缸发动机Single cylinder enginecylinder slnd n.气缸,我只有一个气缸，一组气门；,10,多缸发动机Multi cylinder enginecylinder slnd n.气缸,我有多个气缸，多组气门；,11,二、发动机的基本组成,12,汽油机包含几大系统？,冷却系 cooling system润滑系 lubricati
4、on system lu:brken 润滑，加油;油润;起动系 starting system点火系 Ignition system gnn,13,燃油供给系 fuel supply system进气系统 intake system排气系统 exhaust system gz:st,14,Cooling system(冷却系统),Starting system(起动系统),15,Lubrication system(润滑系统),Ignition system(点火系统),16,Fuel supply system(燃油供给系统),intake system(进气系统),17,例句分析：,Eng
5、ine system includes：_、_、_、_.中文：include vt.包括，包含；译文：发动机系统包括：_、_、_、_。,ignition system,starting system,lubrication system,cooling system,点火系统,起动系统,润滑系统,冷却系统,18,汽油机包括哪两大机构？,Crank-connecting rod mechanism,曲 柄,连杆,机构,19,配气机构,Valve mechanism,气 门,机 构,20,Intake 进气,Compression压缩,Exhaust排放,Power做功,Stroke./struk
6、/n.打击；中风；笔画；冲程；尝试；轻抚,三、发动机的四大工作行程,21,四、发动机的布置形式,发动机前置前轮驱动,发动机前置后轮驱动,发动机后置后轮驱动,22,课堂小结,需要记住的单词：发动机底盘车身电器系统汽油柴油冲程,EngineChassisBodyElectrical systemGasolineDieselstroke,23,单独的，独立的气缸曲柄连杆机构配气机构,SinglecylinderCrank-connecting rod mechanismkrkn.机曲柄;妙语，奇想rd n.杆，拉杆;惩罚，体罚;（责打人用的）棍棒;手枪;meknzm机制Valve mechanism
7、英 vlv 美 vlv n阀;真空管;（管乐器的）活栓;（心脏的）瓣膜;,24,排气系统 Exhaust system润滑系统 Lubrication system 点火系统 Ignition system启动系统 Starting system冷却系统 Cooling system进气系统 Intake system,25,需要记住的句子,There are four basic components of the automobile:engine,chassis,body and electrical system.译：汽车有四个基本组成部分，发动机，底盘，车身和电气系统。Engine
8、system includes：ignition system，lubrication system,cooling system,starting system.译：发动机系统包括：点火系，润滑系，冷却系，起动系。,26,布置任务,将需要记住的单词和句子记录在笔记本上；将需要记住的单词每个写3遍，1遍汉语意思；,Pre-questions,The heart of automobile,What impression of the engine?,complicated,power,Pre-questions,What are there types of the engine?electr
9、ic motors,steam engines,and internal combustion engines Whats 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,Single-cylinder engine,cylinder,piston,Piston pin,Connecting rod
10、,crankshaft,Oil pipe,Intake valve,Exhaust valve,Timing gear,Oil pump,what is the power source of automobile and how to produce?,piston,piston pin,connecting rod,crankshaft,EnginePower is produced by the linear motion of a piston in a cylinder.The connecting rod transmits the up-and-down motion of th
11、e piston to the crankshaft,which changes it into rotary motion.,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,connecting ro
12、d,flywheel,crankshaft,piston,intake valve,exhaust valve,push rod,tappet,timing gears,Valve gear Connecting rod,Engine cooling system,Engine lubricating system,Fuel supply system,Valve gear,Whats the function of the crankshaft and connecting rod mechanism?Its function is to convert heat energy into m
13、echanical energy used to drive the vehicles.,Pre-questions,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 Expla
14、nation,Of all automobile components,an automobile engine is the most complicated assembly with dominant effects on the function of an plicated kmplikeitid adj.复杂的,难解的dominance dmnns 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 mechanic
15、al energy used to drive the vehicles.Convertinto.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.转变；变换That building has been converted into a school.那座楼房改成学校了。兑换 I want to convert some Hong Kong dollars into American dollars.我想把一些港元换成美元。改变信仰、党派或意见等 She managed to convert him to her o
16、pinion.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 pistn n.活塞,II.Text Explanation,The piston attached to the top of a connecting rod by a pin,called a piston pin or wrist pin.attach to v.连接 connecting rod 连杆
17、 piston pin=wrist pin 活塞销,II.Text Explanation,The connecting rod transmits the up-and-down motion of the piston to the crankshaft,which changes it into rotary motion.transmitto 把传到 which changes it into rotary motion 定语从句,II.Text Explanation,diesel engineswater pumpthe ignition distributoroil pantim
18、ing gearcrankshaft and connecting rod mechanismvalve gearfuel systemexhaust pipeexhaust manifold,III.Exercises,Translate the following expressions into Chinese.,柴油发动机水泵分电器油底壳正时齿轮曲柄连杆机构配气机构燃油系统排气管排气歧管,1-cylinder head cover 2-piston3-timing toothed belt4-water pump5-oil pan6-oil pump7-crankshaft8-flyw
19、heel9-distributor10-valve,III.Exercises,The crankshaft represents the final link in the conversion of reciprocating motion at the piston to one of rotation at the flywheel.In the cast of the multi-cylinder engine,the crankshaft has to control the relative motions of the pistons,while receiving their
20、 own impulses.A one-piece construction is most commonly used for the motor-vehicle crankshaft,which extends the whole length of the engine and must therefore possess considerable rigidity.,III.Exercises,The timing-drive for the engine valve mechanism is taken from the front end of the crankshaft as
21、is the pulley and belt drive for the engine auxiliaries,such as the cooling fan and the alternator for electrical system.attached to the rear end of the crankshaft is the engine flywheel.,III.Exercises,I.Translate the following sentences into Chinese.1Engine is the power source of the automobile.Pow
22、er is produced by the linear motion of a piston in a cylinder.发动机是汽车的动力源.它通过汽缸内的活塞线性运动产生的.2The fuel system works according to the requirements of the engine as it provides an air-fuel mixture which must be in proportion to the speed and load placed on the engine.燃油系统的作用是根据发动机的转速和负荷提供一定比例的可燃混合气以满足发动机
23、的需求。,III.Exercises,3The valve gear provides timely admission of the fresh charge into the cylinders and exhaust of spent gases from them.配气机构机构可定时的将新鲜气体充入气缸，并且将废气排放出去。,III.Exercises,1发动机主要有两大机构五大系统组成。An engine is mainly composed of two mechanisms and five systems.2曲柄连杆机构主要包括机体组，活塞连杆组和曲轴飞轮组。The crank
24、shaft and connecting rod mechanism mainly consists of the engine crankcase and cylinder block,the piston and connecting rod,the crankshaft and flywheel.,III.Exercises,II.Translate the following sentences into English.,3水泵工作时，可以将冷却液在发动机水套中和散热器之间来回流动。When revolving,the water pump circulates coolant between the engine water jackets and the radiator.,III.Exercises,III.Exercises,Principle of Four-stroke Engine,1、intake stroke 2、compress stroke 3、power stroke 4、exhaust stroke,Intake valve,Exhaustvalve,Thank You!,
