（中職）汽車維修專業(yè)英語Chapter five教學(xué)課件

1、YCF正版可修改PPT（中職）汽車維修專業(yè)英語Chapter five教學(xué)課件 Reading MaterialsChapter FiveThe first automobile was produced in Germany in 1886.It ran on petrol.It was lighter than a steam engine.It was Karl Benz and Gottlieb Daimler that made“horseless carriages”. But this kind of vehicle is very noisy.In 1956,China had

2、 her first truck, which was made in No.1 Automobile Manufacturer of Changchun.Now, there are many kinds of cars all over the world, some of them have quite excellent performance.Some main domestic automobile manufacturers: the First Automobile Factory of China, Shanghai Automobile manufacturer, Beij

3、ing manufacturer and so on.Some foreign automobile manufacturer: General Motors Corporation, Benz, Mitsubish Motor Corporation, Toyota Motor Corporation, etc.The total construction of an automobile usually consists of engine, chassis, body and electrical equipments. Unit SixteenThe History and Major

4、 Development of AutoGasoline Engine : crank-connecting rod mechanism,mixture distribution mechanism,fuel supply system,igniting system,cooling system,lubricating system,starting system. Chassis : transmission system,drive system,brake system,steering system.The Electrical Equipments : battery, ignit

5、ion and start system, lights, instrument panel, wipers, power windows, air conditional and so on.Notes1. Now, there are many kinds of cars all over the world, some of them have quite excellent performance.現(xiàn)在,各種車型遍布世界,其中一些具有相當(dāng)卓越的性能。2. The total construction of an automobile usually consists of engine

6、, chassis, body and electrical equipments.汽車的總體構(gòu)造通常包括發(fā)動(dòng)機(jī)、底盤、車身和電氣設(shè)備。3.and so on等等,諸如此類e.g.There are many apples, watermelons, bananas and so on in the basket.籃子里有很多蘋果、西瓜、香蕉等。 Unit SeventeenEngine Operating PrinciplesThe actions taking place in the engine cylinder can be divided into 4 strokes.A stro

7、ke is the piston movement from TDC to BDC or from BDC to TDC.The 4 piston strokes are intake, compression, power (ignition, firing) and exhaust.Intake Stroke: The intake valve opens, piston goes down, the petrol/air mixture enters into the cylinder.Compression Stroke: After the piston reaches BDC, t

8、he inlet valve closes.The revolving crankshaft pushes the piston up again.The mixture is compressed upward into the combustion chamber.Power Stroke: As the piston reaches TDC, an electric spark is produced at the spark plug, this ignites the mixture.The heat from the explosion causes high pressure o

9、n the top of the piston, and itll go down again.Exhaust Stroke: As the piston reaches BDC, the exhaust valve opens.During the up-stroke the products of combustion are pushed past the valve and out of the engine.Then, when the piston reaches TDC, the exhaust valve closes and the intake valve opens ag

10、ain.The above 4 strokes are continuously repeated. 1.intake stroke pression stroke3.power stroke4.exhaust stroke5.inlet valve6.mixture7.spark plug8.exhaust gas9.exhaust valveNotes1.take place發(fā)生 e.g.The actions taking place in the engine cylinder can be divided into 4 strokes.發(fā)生在發(fā)動(dòng)機(jī)氣缸里的動(dòng)作過程可以分為四個(gè)沖程。T

11、his accident took place in Beijing.事故發(fā)生在北京。2.A stroke is a pistonmovement from TDC to BDC or from BDC to TDC.一個(gè)沖程是指活塞從上止點(diǎn)到下止點(diǎn)的運(yùn)動(dòng)或從下止點(diǎn)到上止點(diǎn)的運(yùn)動(dòng)。TDC:Top Dead Center 上止點(diǎn)BDC:Bottom Dead Center下止點(diǎn)bustion chamber燃燒室4.electric spark電火花5.The above 4 strokes are continuously repeated.以上四個(gè)沖程周而復(fù)始,不斷循環(huán)。Notes1. AT

12、(Automatic Transmission)自動(dòng)變速器2.自動(dòng)變速器的擋位一般分為P、R、N、D、2、1或L等。(1)P(Parking):停車擋。(2)R(Reverse):倒擋。(3)N(Neutral):空擋。(4)D(Drive):前進(jìn)擋。由于不同車型有不同的設(shè)計(jì),所以“D”擋一般包括從1擋至高擋或者2擋至高擋,并因車速及負(fù)荷的變化而自動(dòng)換擋。將撥桿放置在“D”擋上,駕駛者只需控制油門踏板就可以控制車速了。 (5)2(Second Gear):前進(jìn)擋。變速器只能在1擋、2擋之間變換,不會(huì)跳到3擋和4擋。 (6)1(First Gear):前進(jìn)擋。變速器只能在1擋內(nèi)工作,不能變換到其

13、他擋位。它在交通嚴(yán)重堵塞的情況和坡度較大的斜坡上最能發(fā)揮功用,上斜坡或下斜坡時(shí),可充分利用汽車發(fā)動(dòng)機(jī)的扭力。 Unit Eighteen Automatic TransmissionKnow More自動(dòng)變速器常見的有三種形式,分別是液力自動(dòng)變速器(AT)、機(jī)械無級自動(dòng)變速器(CVT)、電控機(jī)械自動(dòng)變速器(AMT)。AT主要由液力變矩器、行星齒輪和液壓操縱系統(tǒng)組成,通過液力傳遞和齒輪組合的方式來達(dá)到變速、變矩。CVT省去了復(fù)雜、笨重的齒輪組合變速傳動(dòng),而由兩組帶輪進(jìn)行變速傳動(dòng)。AMT和液力自動(dòng)變速器(AT)一樣是有級自動(dòng)變速器。()FRC Maintenance OperationsA=Connection B=Sealing C=Visual Aspect D=Clearance E=Greasing F=MeasurementG=Axial Clearance H=Cleaning I=LevelJ=Clamping K=Spring Test L=VoltageM=Pr