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1、Unit 2-1Main Components of Engine,Contents,Pre-questions,II. Text Explanation,III. Exercises,Pre-questions,The heart of automobile,What impression of the engine?,complicated,power,Pre-questions,What are there types of the engine?electric motors, steam engines, and internal combustion engines Whats t
2、he 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,crankshaft,Oil pipe,Intake valve,Exhaust valve,Timing gear,Oi
3、l 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 the piston to the crankshaft, which changes it into rotary moti
4、on.,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 rod,flywheel,crankshaft,piston,intake valve,exhaust va
5、lve,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 mechanical energy used to drive the vehicles.,Pre-q
6、uestions,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 automob
7、ile engine is the most complicated assembly with dominant effects on the function of an automobile. complicated 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 mechanical energy used to drive the
8、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 opinion. 她终于设法说服了他接受她的意见
9、。,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 piston pin =
10、 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 pantiming gea
11、rcrankshaft 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-flywheel9-
12、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 o
13、wn 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 a
14、s 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 automob
15、ile. Power 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
16、合气以满足发动机的需求。,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
17、。The crankshaft 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 !,
