汽车构造英文
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CHAPTER 1 AUTOMOTIVE BASICS1.1 Principal ComponentsToday's average car contains more than 15,000 separate, individual parts that must work together. These parts can grouped into four major categories: engine, body, chassis and electrical equipment.1.2 EngineThe engine acts as the power unit. The internal combustion engine is most common: this obtains its power by burning a liquid fuel inside the engine cylinder. There are two types of engine :gasoline(also called a spark-ignition engine) and diesel(also called a compression-ignition engine).Both engines are called heat engines; the burning fuel generates heat which causes the gas inside the cylinder to increase its pressure and supply power to rotate a shaft connected to the transmission.1.3 BodyAn automobile body is a sheet metal shell with windows, doors, a hood, and a trunk deckbuilt into it. It provides a protective covering for the engine, passengers, and cargo. The body is designed to keep passengers safe and comfortable. The body styling provides an attractive, colorful, modern appearance for the vehicle.1.4 ChassisThe chassis is an assembly of those systems that are the major operating part of a vehicle. The chassis includes the transmission, suspension, steering, and brake systems.Transmission systems ― conveys the drive to the wheels. The main components are clutch, gearbox, driveshaft, final drive, and differential.Suspension― absorbs the road shocks.Steering― controls the direction of the movement.Brake― slows down the vehi cle.1.5 Electrical EquipmentThe electrical system supplies electricity for the ignition, horn, lights, heater, and starter. The electricity level is maintained by a charging circuit. This circuit consists of the battery, alternator (or generator). The battery stores electricity. The alternator changes the engine's mechanical energy into electrical energy and recharges the battery. New WordsPrincipal component 主要部件 category 种类,类型body 车身 chassis 底盘layout 布置 power unit 动力装置internal combustion engine 燃机 cylinder 汽缸gasoline 汽油 spark 火ignition 点燃,点火 diesel 柴油机compression 压缩 shaft 轴transmission 传动系 sheet metal 金属板shell 外壳 hood (发动机)罩trunk deck 行舱盖 cargo 货物styling 样式 assembly 总成,装配suspension 悬挂,悬置 shock 冲击steering 转向,操纵 brake 刹车,制动器clutch 离合器 gearbox 变速器driveshaft 传动轴 final drive 主减速器,后桥 differential 差速器 slow down (使)慢下来,减速horn 喇叭 starter 起动机charge 充电 alternator 交流发电机Review Questions1.List the main parts of an automobile?2.What are the common types of a vehicle according to body styling?3.Which systems does a chassis include and what are the main functions of the chassis?4.Why are suspension systems used on vehicles?CHAPTER2 INTERNAL COMBUSTION ENGINE2.1 principle of operation2.1.1 Engine and powerEngine is used to produce power. The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. This process is called combustion. If engine combustion occurs with the power chamber. ,the engine is called internal combustion engine. If combustion takes place outside the cylinder, the engine is called an external combustion engine.Engine used in automobiles are internal combustion heat engines. Heat energy released in the combustion chamber raises the temperature of the combustion gases with the chamber. The increase in gas temperature causes the pressure of the gases to increase. The pressure developed within the combustion chamber is applied to the head of a piston to producea usable mechanical force, which is then converted into useful mechanical power.2.1.2 Engine TermsLinking the piston by a connecting rod to a crankshaft causes the gas to rotate the shaft through half a turn. The power stroke “uses up” the gas , so means must be provided to expel the burnt gas and recharge the cylinder with a fresh petrol-air mixture :this control of gas movement is the duty of the valves ;an inlet valve allows the new mixture to enter at the right time and an exhaust valve lets out the burnt gas after the gas has done its job. Engine terms are :TDC(Top Dead Center):the position of the crank and piston when the piston is farther away from the crankshaft.BDC(Bottom Dead Center):the position of the crank and piston when the piston is nearest to the crankshaft.Stroke : the distance between BDC and TDC; stroke is controlled by the crankshaft. Bore : the internal diameter of the cylinder.Swept volume : the volume between TDC and BDC.Engine capacity : this is the swept volume of all the cylinder e.g. a four-stroke having a capacity of two liters(2000cm) has a cylinder swept volume of 50cm.Clearance volume: the volume of the space above the piston when it is at TDC.Compression ratio = (swept vol + clearance vol)\(clearance vol)Two-stroke : a power stroke every revolution of the crank.Four-stroke : a power stroke every other revolution of the crank..2.1.3 The Four-stroke Spark-ignition Engine CycleThe spark-ignition engine is an internal-combustion engine with externally supplied in ignition, which converts the energy contained in the fuel to kinetic energy.The cycle of operations is spread over four piston strokes. To complete the full cycle it takes two revolutions of the crankshaft.The operating strokes are :This stroke introduces a mixture of atomized gasoline and air into the cylinder. The stroke starts when the piston moves downward from a position near the top of the cylinder. As the piston moves downward, a vacuum, or low-pressure area, is created.During the intake stroke, one of the ports is opened by moving the inlet valve. The exhaust valve remains tightly closed.Compression strokeAs the piston moves upward to compress the fuel mixture trapped in the cylinder, the valves are closed tightly. This compression action heats the air/fuel mixture slightly and confines it within a small area called the combustion chamber.Power strokeJust before the piston reaches the top of its compression stroke, an electrical spark is introduced from a spark plug screwed into the cylinder head.The spark ignites the compressed, heated mixture of fuel and air in the combustion chamber to cause rapid burning. The burning fuel produces intense heat that causes rapid expansion of the gases compressed within the cylinder. This pressure forces the piston downward. The downward stroke turns the crankshaft with great force.Exhaust strokeJust before the bottom of the power stroke, the exhaust valve opens. This allows the piston, as it moves upward, to push the hot, burned gases out through the open exhaust valve. Then, just before the piston reaches its highest point, the exhaust valve closes and the inlet valve opens. As the piston reaches the highest point in the cylinder, known as TDC, it starts back down again. Thus, one cycle ends and another begins immediately.2.1.4 Engine Overall MechanicsThe engine has hundreds of other parts . The major parts of engine are engine block , engine heads, pistons, connecting rods, crankshaft and valves. The other parts are joined to make systems. These systems are the fuel system, intake system, ignition system, cooling system, lubrication system and exhaust system. Each of these systems has a definite function. These systems will discussed in detail later.NEW WORDPiston 活塞 Connecting rod 连杆Crankshaft 曲轴 Power stoke 活塞行程Expel 排出 Valve 气阀inlet(intake) valve 进气阀 exhaust valve 排气阀term 术语 TDC 上止点BDC 下止点 Bore 缸径swept volume 有效容积 engine capacity 发动机排量clearance volume 余隙容积,燃烧室容积 compression ratio 压缩比revolution 旋转,转数 every other 每隔一个cycle 循环 spread over 分布,遍及intake stroke 进气行程 compression stroke 压缩行程knock 敲缸,敲打 exhaust stroke 排气行程engine block 发动机缸体 lubrication 润滑2.2 Engine Block and Cylinder Head2.2.1 Engine BlockThe engine block is the basic frame of the engine. All other engine parts either fit insideit or fasten to it. It holds the cylinders, water jackets, and oil galleries. The engine block also holds the crankshaft, which fastens to the bottom of the block. The camshaft also fits inside the block, except on overhead-cam engines (OHC). In most cars, this block is made of gray iron, or an alloy (mixture) of gray iron and other metals, such as nickel or chromium. Engine blocks are castings.Some engine blocks, especially those in smaller cars, are made of cast aluminum. This metal is much lighter than iron. However, iron wears better than aluminum. Therefore, the cylinders in most aluminum engines are lined with iron or steel sleeves. These sleeves are called cylinder sleeves. Some engine blocks are made entirely of aluminum.2.2.2 Cylinder HeadThe cylinder head fastens to the top of the block, just as a roof fits over a house. The underside forms the combustion chamber with the top of the piston. The most common cylinder head types are the hemi, wedge, and semi-hemi. All three of these terms refer to the shape of the engine's combustion chamber. The cylinder head carries the valves, valve springs and the rockers on the rocker shaft, this part of the valve gear being worked by the push-rods. Sometimes the camshaft is fitted directly into the cylinder head and operates on the valves without rockers. This is called an overhead camshaft arrangement. Like the cylinder block, the head is made from either cast iron or aluminum alloy.2.2.3 GasketThe cylinder head is attached to the block with high-tensile steel studs. The joint between the block and the head must be gas-tight so that none of the burning mixture can escape. This is achieved by using cylinder head gasket. This is a sandwich gasket, i.e. a sheet of asbestos between two sheets of copper, both these materials being able to withstand the high temperature and pressures within the engine.2.2.4 Oil Pan or SumpThe oil pan is usually formed of pressed steel. The oil pan and the lower part of the cylinder block together are called the crankcase; they enclose, or encase, the crankshaft. The oil pump in the lubricating system draws oil from the oil pan and sends it to all working parts in the engine. The oil drains off and runs down into the pan. Thus, there is constant circulation of oil between the pan and the working parts of the engine.New Wordsengine block 缸体 cylinder head 气缸盖 fasten 使固定water jacket 水套 oil gallery 油道 camshaft 凸轮轴overhead-cam(OHC) 顶置凸轮 gray iron 灰铸铁 alloy 合金nickel 镍 chromium 铬 casting 铸件head cover 汽缸盖罩 intake manifold 进气总管 distributor 分电器oil pan 油底壳 aluminum 铝 be lined with 镶有cylinder sleeve 气缸套 hemi 半球形 wedge 楔型,楔入semi-hemi 准半球形 rocker 摇臂 push-rod 推杆gasket 衬垫 high-tensile 高强度的 stud 螺栓gas-tight 密封的 asbestos 石棉 crankcase 曲轴箱,曲柄箱encase 封闭,把…包起来 drain off 排出,流出Review Question1.What do TDC, BDC, stroke, compression ratio and engine capacity stand for?2.How do you calculate swept volume and compression ratio?3.What controls the length of the stroke?4.List the main parts of the engine overall mechanics?5.What are the main function of the engine block?2.3 Piston Connecting Rod and Crankshaft2.3.1 Piston AssemblyThe piston is an important part of a four-stroke cycle engine. Most pistons are made from cast aluminum. The piston , through the connecting rod, transfers to the crankshaft the force create by the burning fuel mixture. This force turns the crankshaft .Thin, circular , steel bands fit into grooves around the piston to seal the bottom of the combustion chamber. These bands are called piston rings. The grooves into which they fit are called ring grooves. A piston pin fits into a round hole in the piston . The piston pin joins the piston to the connecting rod . The thick part of the piston that holds the piston is the pin boss.The piston itself , its rings and the piston pin are together called the piston assembly.2.3.2.PistonTo withstand the heat of the combustion chamber, the piston must be strong. It also must be light, since it travels at high speeds as it moves up and down inside the cylinder. The piston is hollow. It is thick at the top where it take the brunt of the heat and the expansion force. It is thin at the bottom, where there is less heat. The top part of the piston is the head , or crown . The thin part is the skirt The sections between the ring grooves are called ring lands.The piston crown may be flat , concave ,dome or recessed . In diesel engine , the combustion chamber may be formed totally or in part in the piston crown , depending on the method of injection . So they use pistons with different shapes.2.3.3Piston RingsAs Fig.2-9 shows , piston rings fit into ring grooves near the of the piston. In simplest terms, piston rings are thin, circular pieces of metal that fit into grooves in the tops of the pistons.In modern engines ,each piston has three rings. (Piston in older engines sometimes had four rings, or even five.) The ring’s outside surface presses against the cylinder walls. Rings provide the needed seal between the piston and the cylinder walls. That is, only the rings contact the cylinder walls. The top two rings are to keep the gases inthe cylinder and are called compression rings. The lower one prevents the oil splashed onto the cylinder bore from entering the combustion chamber , and is called an oil ring. Chrome-face cast-iron compression rings are commonly used in automobile engines. The chrome face provide a very smooth , wear-resistant surface.During the power stoke , combustion pressure on the combustion rings is very high. It causes them to untwist . Some of the high-pressure gas gets in back of the rings. This force the ring face into full contact with the cylinder wall. The combustion pressure also holds the bottom of the ring tightly against the bottom of the ring groove. Therefore , high combustion pressure causes a tighter seal between the ring face and the cylinder wall.2.3.4 Piston PinThe piston pin holds together the piston and the connecting rod . This pin fits into the piston pin holes and into a hole in the top end of the connecting rod. The top end of is much smaller than the end that fits on the crankshaft . This small end fits inside the bottom of the piston . The piston pin fits through one side of the piston , through the small end of the rod , and then through the other side of the piston . It holds the rod firmly in place in the center of the piston. Pins are made of high-strengh steel and have a hollow center . Many pins are chrome-plated to help them wear better.2.3.3 Connecting rodThe connecting rod is made of forgedhigh-strength steel . It transmits and motion from the piston to the crankpin on the crankshaft . The connecting rod little end is connected to the piston pin . A bush made from a soft metal , such as bronze , is used for this joint . The lower end of the connecting rod fits the crankshaft journal . This is called the big end . For this big-end bearing , steel-backed lead or tin shell bearing are used . These are the same as those used for the main bearings . The split of the big end is sometimes at an angle , so that it is small enough to be withdrawn through the cylinder bore . The connecting rod is made from forged alloy steel .2.3.5 CrankshaftThe crankshaft , in conjunction with the connecting rod , coverts the reciprocating motion of the piston to the rotary motion needed to drive the vehicle . It is usually made from carbon steel which is alloyed with a small proportion of nickel .The main bearing journals fit into the cylinder block and the big end journals align with the connecting rods .At the rear end of the crankshaft is attached the flywheel , and at the front end are the driving whells for the timing gears , fan , cooling water and alternator .The throw of the crankshaft , the distance between the main journal and the big end centers , controls the length of the stroke . The stroke is double the throw , and the stroke-length is the distance that the piston travels from TDC to BDC and vice versa .2.3.6 FlywheelThe flywheel is the made from carbon steel . It fit s onto the rear of the crankshaft . As well as keeping the engine rotating between power strokes it also carries the clutch , which transmits the drive to the transmission , and has the starter ring gear around itscircumference . There is only one working stroke in four so a flywheel is needed to drive the crankshaft during the time that the engine is performing the non-power strokes .New WordsComprise 由。
第一类 MOTOR VEHICLE 汽车一、Vehicle classification 汽车分类1.2 Bus 客车1.3 Motor truck 货车1.4 special purpose vehicle 专用汽车二、Vehicle construction 汽车构造2.1 Main components of vehicle 汽车主要组成2.2 Vehicle performance 汽车性能2.3 engine position 发动机布置三、Vehicle dimensions汽车尺寸五、Diameter of turning circle 转弯直径第二类ENGINE 发动机一、Engine construction 发动机构造二、Essential term 基本术语三、Engine operation principle发动机工作原理3.1 Four-stroke gasoline engine operation principle四冲程汽油机工作原理3.2 Four-stroke diesel engine operational principle四冲程柴油机工作原理3.3 Two-stroke gasoline engine operation principle二冲程汽油机工作原理3.4 Two-stroke diesel engine operation principle二冲程柴油机工作原理四、Engine performance 发动机性能曲柄连杆机构5.2 Piston,connecting rod 活塞连杆组5.3 Crankshaft,flywheel 曲轴飞轮组六、Valve mechanism 配气机构6.1 Side valve 侧置气门6.2 Overhead valve 顶置气门6.3 Overhead valve 顶置气门6.4 Valve-timing diagram 配气相位图七、Gasoline engine-fuel system汽油机供油泵7.1 Fuel system 供油泵7.2 Air cleaner 空气滤清器7. 3 Fuel pump,fuel filter汽油泵,汽油滤清器7.4 Simple carburetor 简单化油器7.5 Carburetor 化油器7.6 Carburetor elements 化油器零件7.7 Carburetor control 化油器操纵件7.8Gasoline injection 汽油喷射7.9 Electric fuel pump,Injector电动汽油泵,喷油器7.10 Sensor 传感器八、Diesel engine-fuel system柴油机工友系8.1 Fuel system 供油泵8.2 Combustion chamber 燃烧室8.3 Injection pump 喷油泵8.4 Injection 喷油器8.5 Speed governor 调速器九、Exhaust system 排气系统十、Turbo-supercharging 蜗轮增压10.1 Turbocharging system 蜗轮增压系统10.2 Turbocharger 蜗轮增压器十一、Emission control 排污控制11.1 Emission control system 排污控制系统11.2 Catalytic convertor 催化转化器 十二、Engine-cooling system 发动机冷却机12.1 Water cooling system 水冷系12.2 Radiator 传感器12.3 Fan,water pump 风扇,水泵12.4 Air cooling system 风冷系十三、Engine-lubrication system发动机润滑系13.1 Pressure lubrication 压力润滑13.2 Oil pump 机油泵13.3 Oil cleaner 机油滤清器13.4 Oil cooling radiator 机油散热器发动机点火系14.2 Lead battery 铅蓄电池14.3 Ignition coil 点火线圈14.4 Distributor 分电器14.5 Spark plug 火花塞14.6 Electronic ignition 电子点火十五、Engine-starting system发动机起动系15.1 Starting system 起动系15.2 Electric starter 电动起动机十六、New type engines 新型发动机16.1 Rotary piston engine 旋转活塞发动机16.2 Gas turbine 燃气轮机16.3 Stirling engine 斯特林发动机(热气机)第三类 CHASSIS 底盘一、Drive line 传动系1.1 Layout of drive line 传动系示意图1.2 Friction clutch 摩擦离合器1.3 Hydrodynamic coupling 液力偶合器1.4 Gearbox-housing 变速器外壳1.5 Gearbox-gearing 变速器齿轮传动1.6 Gearbox-gear-shift 变速器换档机构1.7 Automatic transmission 自动变速器1.8 Transfer case 分动器1.9 Cardan shaft 万向传动器1.10 Flexible coupling 挠性联轴节1.11 Constant-velocity joint 等速万向节1.12 Drive axle 驱动桥1.13 Final drive 主减速器1.14 differential 差速器1.15 Half-axle,rear axle housing二、Running gear 行驶系2.1 Layout of main components 主要组成示意图2.2 Frame 车架2.3 Front axle 前桥2.4 Wheel 车轮2.5 Tire 轮胎2.6 Tire type 轮胎类型2.7 Front wheel independent suspension前轮独立悬架2.8 Rear wheel independent suspension后轮独立悬架2.9 Leaf spring 钢板弹簧2.10 Air suspension 空气悬架2.11 Hydro-pneumatic spring 液压充气弹簧2.12 Telescopic hydraulic shock absorber伸缩式液压减振器2.13 Cam hydraulic shock absorber凸轮式液压减振器三、Steering system 转向系Mechanical steering system 机械转向系3.2 Power steering system 动力转向系3.3 Steering mechanism 转向机构213.4 Steering gear 转向器3.5 Power steering 动力转向3.6 steering linkage 转向杆系四、 Braking system 制动系4.1 Braking principles 制动原理4.2 Drum brake 鼓式制动器4.2 Drum brake224.4 Hand brake 手制动器 (parking brake 驻车制动器)4.5 hydraulic brake system 液压制动系 4.6 Brake master cylinder,Wheel cylinder制动主缸,制动轮缸4.7 Compressed-air brake system 气压制动系 4.8 Anti-lock braking system 防抱死制动系第四类、BODY AND ACCESSORIES 车身及附属装置一、Car body 轿车车身二、All-steel body 全钢车身三、Car door 轿车车门四、Bus body 大客车车身2324五、Truck body 货车车身六、Special-transport vehicle body专用汽车车身七、Cab驾驶室八、Drivers place 驾驶员位置九、Instrument panel 仪表板十、Seat,Safety belt 座椅,安全带十一、Air conditioning 空调十二、Compressor 压缩机十三、Lighting 照明十四、Head Lamp 前大灯2526十五、Turnsignal lamp 转向灯十六、Windshield wiper 风窗刮水器十八、Horn 喇叭十九、Tools 工具27。
汽车构造英文翻译————————————————————————————————作者: ————————————————————————————————日期:CHAPTER 1 AUTOMOTIVE BASICS1.1 Principal Components 主要构成零部件Today's averagecar containsmore than 15,000 separate, individual parts that must work together.These partscan groupedintofourmajor categories: engine, body,chassis andelectrical equ ipment. 现在,一般汽车由大约一万五千多个独立的零部件组成。
这些部件分为四大类,即发动机(引擎系统),车身,底盘和电气设备。
1.2 Engine发动机/引擎系统The engine actsasthepower unit.The internal combustion engine ismost common:this obtains itspower byburning a liquidfuel inside the engine cylinder. Therearetwotypes of engine :gasoline(alsocalled a spark-ignition engine) and diesel(also called a compression-ignitionengine).Both engines are called heate ngines; the burningfuelgenerates heat which causes the gas inside the cylinderto increaseitspressure andsupply powerto rotate a shaftconnected tothe transmission.引擎的作用是动力产生的部件。
第一类 MOTOR VEHICLE 汽车一、Vehicle classification 汽车分类1.2 Bus 客车1.3 Motor truck 货车1.4 special purpose vehicle 专用汽车二、Vehicle construction 汽车构造2.1 Main components of vehicle 汽车主要组成2.2 Vehicle performance 汽车性能2.3 engine position 发动机布置第二类 ENGINE 发动机一、Engine construction 发动机构造二、Essential term 基本术语六、Valve mechanism 配气机构 6.1 Side valve 侧置气门12.3 Fan,water pump 风扇,水泵发动机润滑系13.1 Pressure lubrication 压力润滑16.1 Rotary piston engine 旋转活塞发动机16.2 Gas turbine 燃气轮机16.3 Stirling engine 斯特林发动机(热气机)第三类 CHASSIS 底盘一、Drive line 传动系1.1 Layout of drive line 传动系示意图1.2 Friction clutch 摩擦离合器1.3 Hydrodynamic coupling 液力偶合器 1.4 Gearbox-housing 变速器外壳1.7 Automatic transmission 自动变速器1.15 Half-axle,rear axle housing2.1 Layout of main components 主要组成示2.4 Wheel 车轮2.5 Tire 轮胎2.7 Front wheel independent suspension前轮独立悬架 2.10 Air suspension 空气悬架三、Steering system 转向系Mechanical steering system 机械转向系3.3 Steering mechanism 转向机构 3.5 Power steering 动力转向3.6 steering linkage 转向杆系四、 Braking system 制动系4.1 Braking principles 制动原理4.2 Drum brake制动主缸,制动轮缸第四类、BODY AND ACCESSORIES 车身及附属装置一、Car body 轿车车身二、All-steel body 全钢车身四、Bus body 大客车车身七、Cab 驾驶室十二、Compressor 压缩机十三、Lighting 照明十四、Head Lamp 前大灯十五、Turnsignal lamp 转向灯。
汽车专业英语汇总一、Vehicle classification 汽车分类1.1 Car 轿车1.2 Bus 客车1.3 Motor truck 货车1.4 special purpose vehicle 专用汽车二、Vehicle construction 汽车构造2.1 Main components of vehicle 汽车主要组成2.2 Vehicle performance 汽车性能2.3 engine position 发动机布置三、Vehicle dimensions汽车尺寸四、Wheel alignment前轮定位五、Diameter of turning circle 转弯直径第二类ENGINE 发动机一、Engine construction 发动机构造二、Essential term 基本术语三、Engine operation principle发动机工作原理3.1 Four-stroke gasoline engine operation principle四冲程汽油机工作原理3.2 Four-stroke diesel engine operational principle四冲程柴油机工作原理3.3 Two-stroke gasoline engine operation principle二冲程汽油机工作原理3.4 Two-stroke diesel engine operation principle二冲程柴油机工作原理四、Engine performance 发动机性能曲柄连杆机构5.2 Piston,connecting rod 活塞连杆组5.3 Crankshaft,flywheel 曲轴飞轮组六、Valve mechanism 配气机构6.1 Side valve 侧置气门6.2 Overhead valve 顶置气门6.3 Overhead valve 顶置气门6.4 Valve-timing diagram 配气相位图七、 Gasoline engine-fuel system汽油机供油泵 7.1 Fuel system 供油泵7.2 Air cleaner 空气滤清器7. 3 Fuel pump,fuel filter 汽油泵,汽油滤清器7.4 Simple carburetor 简单化油器7.5 Carburetor 化油器7.6 Carburetor elements化油器零件7.7 Carburetor control 化油器操纵件7.8 Gasoline injection 汽油喷射7.9 Electric fuel pump,Injector电动汽油泵,喷油器7.10 Sensor 传感器八、Diesel engine-fuel system柴油机工友系8.1 Fuel system 供油泵8.2 Combustion chamber 燃烧室8.3 Injection pump 喷油泵8.4 Injection 喷油器8.5 Speed governor 调速器九、Exhaust system 排气系统十、Turbo-supercharging 蜗轮增压10.1 Turbocharging system 蜗轮增压系统10.2 Turbocharger 蜗轮增压器十一、Emission control 排污控制11.1 Emission control system 排污控制系统11.2 Catalytic convertor 催化转化器十二、Engine-cooling system 发动机冷却机12.1 Water cooling system 水冷系12.2 Radiator 传感器12.3 Fan,water pump 风扇,水泵12.4 Air cooling system 风冷系十三、Engine-lubrication system发动机润滑系13.1 Pressure lubrication 压力润滑13.2 Oil pump 机油泵13.3 Oil cleaner 机油滤清器13.4 Oil cooling radiator 机油散热器发动机点火系14.2 Lead battery 铅蓄电池14.3 Ignition coil 点火线圈14.4 Distributor 分电器14.5 Spark plug 火花塞14.6 Electronic ignition 电子点火十五、Engine-starting system发动机起动系15.1 Starting system 起动系15.2 Electric starter 电动起动机十六、New type engines 新型发动机16.1 Rotary piston engine 旋转活塞发动机16.2 Gas turbine 燃气轮机16.3 Stirling engine 斯特林发动机(热气机)第三类CHASSIS 底盘一、Drive line 传动系1.1 Layout of drive line 传动系示意图1.2 Friction clutch 摩擦离合器1.3 Hydrodynamic coupling 液力偶合器1.4 Gearbox-housing 变速器外壳1.5 Gearbox-gearing 变速器齿轮传动1.6 Gearbox-gear-shift 变速器换档机构1.7 Automatic transmission 自动变速器1.8 Transfer case 分动器1.9 Cardan shaft 万向传动器1.10 Flexible coupling 挠性联轴节1.11 Constant-velocity joint 等速万向节1.12 Drive axle 驱动桥1.13 Final drive 主减速器1.14 differential 差速器1.15 Half-axle,rear axle housing二、Running gear 行驶系2.1 Layout of main components 主要组成示意图2.2 Frame 车架2.3 Front axle 前桥2.4 Wheel 车轮2.5 Tire 轮胎2.6 Tire type 轮胎类型2.7 Front wheel independent suspension前轮独立悬架 2.8 Rear wheel independent suspension后轮独立悬架 2.9 Leaf spring 钢板弹簧2.10 Air suspension 空气悬架2.11 Hydro-pneumatic spring 液压充气弹簧2.12 Telescopic hydraulic shock absorber伸缩式液压减振器2.13 Cam hydraulic shock absorber凸轮式液压减振器21三、Steering system 转向系Mechanical steering system 机械转向系3.2 Power steering system 动力转向系3.3 Steering mechanism 转向机构3.4 Steering gear 转向器3.5 Power steering 动力转向3.6 steering linkage 转向杆系22四、 Braking system 制动系4.1 Braking principles 制动原理4.2 Drum brake 鼓式制动器4.2 Drum brake4.4 Hand brake 手制动器 (parking brake 驻车制动器)4.5 hydraulic brake system 液压制动系234.6 Brake master cylinder,Wheel cylinder制动主缸,制动轮缸4.7 Compressed-air brake system 气压制动系4.8 Anti-lock braking system 防抱死制动系第四类、BODY AND ACCESSORIES 车身及附属装置一、Car body 轿车车身二、All-steel body 全钢车身三、Car door 轿车车门四、Bus body 大客车车身2425五、Truck body 货车车身六、Special-transport vehicle body专用汽车车身七、Cab 驾驶室八、Drivers place 驾驶员位置九、Instrument panel 仪表板十、Seat,Safety belt 座椅,安全带26十一、Air conditioning 空调十二、Compressor 压缩机十三、Lighting 照明十四、Head Lamp 前大灯27十五、Turnsignal lamp 转向灯十六、Windshield wiper 风窗刮水器十七、Wiper-washer equipment刮水器-洗涤器装置十八、Horn 喇叭十九、Tools 工具282930。
第一类 MOTOR VEHICLE 汽车一、Vehicle classification 汽车分类1.2 Bus 客车1.3 Motor truck 货车1.4 special purpose vehicle 专用汽车二、Vehicle construction 汽车构造2.1 Main components of vehicle 汽车主要组2.2 Vehicle performance 汽车性能 2.3 engine position 发动机布置五、Diameter of turning circle 转弯直径第二类 ENGINE 发动机一、Engine construction 发动机构造7.2 Air cleaner 空气滤清器7. 3 Fuel pump,fuel filter 汽油泵,汽油滤7.4 Simple carburetor 简单化油器7.5 Carburetor 化油器第三类CHASSIS 底盘1.2 Friction clutch 摩擦离合器1.3 Hydrodynamic coupling 液力偶合器 1.4 Gearbox-housing 变速器外壳 1.5 Gearbox-gearing 变速器齿轮传动1.10 Flexible coupling 挠性联轴节 1.11 Constant-velocity joint 等速万向节 1.12 Drive axle 驱动桥1.13 Final drive 主减速器2.3 Front axle 前桥2.5 Tire 轮胎2.6 Tire type 轮胎类型2.8 Rear wheel independent suspension后轮独立悬架 2.9 Leaf spring 钢板弹簧2.10 Air suspension 空气悬架2.11 Hydro-pneumatic spring 液压充气弹簧 2.13 Cam hydraulic shock absorber凸轮式液压减振器3.5 Power steering 动力转向4.6 Brake master cylinder,Wheel cylinder制动主缸,制动轮缸4.8 Anti-lock braking system 防抱死制动系 第四类、BODY AND ACCESSORIES 车身及附属装置一、Car body 轿车车身二、All-steel body 全钢车身十二、Compressor 压缩机十五、Turnsignal lamp 转向灯。
第一类 M O T O R V E H I C L E汽车一、Vehicle classification 汽车分类1.2 Bus 客车1.3 Motor truck 货车1.4 special purpose vehicle 专用汽车二、Vehicle construction 汽车构造2.1 Main components of vehicle 汽车主要组成2.2 Vehicle performance 汽车性能2.3 engine position 发动机布置三、Vehicle dimensions汽车尺寸五、Diameter of turning circle 转弯直径第二类ENGINE 发动机一、Engine construction 发动机构造二、Essential term 基本术语三、Engine operation principle发动机工作原理3.1 Four-stroke gasoline engine operation principle四冲程汽油机工作原理3.2 Four-stroke diesel engine operational principle四冲程柴油机工作原理3.3 Two-stroke gasoline engine operation principle二冲程汽油机工作原理3.4 Two-stroke diesel engine operation principle二冲程柴油机工作原理四、Engine performance 发动机性能曲柄连杆机构5.2 Piston,connecting rod 活塞连杆组5.3 Crankshaft,flywheel 曲轴飞轮组六、Valve mechanism 配气机构6.1 Side valve 侧置气门6.2 Overhead valve 顶置气门6.3 Overhead valve 顶置气门6.4 Valve-timing diagram 配气相位图七、Gasoline engine-fuel system汽油机供油泵7.1 Fuel system 供油泵7.2 Air cleaner 空气滤清器7. 3 Fuel pump,fuel filter汽油泵,汽油滤清器7.4 Simple carburetor 简单化油器7.5 Carburetor 化油器7.6 Carburetor elements化油器零件7.7 Carburetor control 化油器操纵件7.8 Gasoline injection 汽油喷射7.9 Electric fuel pump,Injector电动汽油泵,喷油器7.10 Sensor 传感器八、Diesel engine-fuel system柴油机工友系8.1 Fuel system 供油泵8.2 Combustion chamber 燃烧室8.3 Injection pump 喷油泵8.4 Injection 喷油器8.5 Speed governor 调速器九、Exhaust system 排气系统十、Turbo-supercharging 蜗轮增压10.1 Turbocharging system 蜗轮增压系统10.2 Turbocharger 蜗轮增压器十一、Emission control 排污控制11.1 Emission control system 排污控制系统11.2 Catalytic convertor 催化转化器十二、Engine-cooling system发动机冷却机12.1 Water cooling system 水冷系12.2 Radiator 传感器12.3 Fan,water pump 风扇,水泵12.4 Air cooling system 风冷系十三、Engine-lubrication system发动机润滑系13.1 Pressure lubrication 压力润滑13.2 Oil pump 机油泵13.3 Oil cleaner 机油滤清器13.4 Oil cooling radiator 机油散热器十四、Engine-ignition system发动机点火系14.2 Lead battery 铅蓄电池14.3 Ignition coil 点火线圈14.4 Distributor 分电器14.5 Spark plug 火花塞14.6 Electronic ignition 电子点火十五、Engine-starting system发动机起动系15.1 Starting system 起动系15.2 Electric starter 电动起动机十六、New type engines 新型发动机16.1 Rotary piston engine 旋转活塞发动机16.2 Gas turbine 燃气轮机16.3 Stirling engine 斯特林发动机(热气机)第三类 CHASSIS 底盘一、Drive line 传动系1.1 Layout of drive line 传动系示意图 1.2 Friction clutch 摩擦离合器1.3 Hydrodynamic coupling 液力偶合器1.4 Gearbox-housing 变速器外壳1.5 Gearbox-gearing 变速器齿轮传动1.6 Gearbox-gear-shift 变速器换档机构1.7 Automatic transmission 自动变速器1.8 Transfer case 分动器1.9 Cardan shaft 万向传动器1.10 Flexible coupling 挠性联轴节1.11 Constant-velocity joint 等速万向节1.12 Drive axle 驱动桥1.13 Final drive 主减速器1.14 differential 差速器1.15 Half-axle,rear axle housing二、Running gear 行驶系2.1 Layout of main components 主要组成示意图2.2 Frame 车架2.3 Front axle 前桥2.4 Wheel 车轮2.5 Tire 轮胎2.6 Tire type 轮胎类型2.7 Front wheel independent suspension前轮独立悬架2.8 Rear wheel independent suspension后轮独立悬架2.9 Leaf spring 钢板弹簧2.10 Air suspension 空气悬架2.11 Hydro-pneumatic spring 液压充气弹簧2.12 Telescopic hydraulic shock absorber伸缩式液压减振器2.13 Cam hydraulic shock absorber凸轮式液压减振器三、Steering system 转向系Mechanical steering system 机械转向系3.2 Power steering system 动力转向系3.3 Steering mechanism 转向机构3.4 Steering gear 转向器3.5 Power steering 动力转向3.6 steering linkage 转向杆系四、Braking system 制动系4.1 Braking principles 制动原理4.2 Drum brake 鼓式制动器4.2 Drum brake4.4 Hand brake 手制动器(parking brake 驻车制动器)214.5 hydraulic brake system 液压制动系4.6 Brake master cylinder,Wheel cylinder制动主缸,制动轮缸4.7 Compressed-air brake system 气压制动系4.8 Anti-lock braking system 防抱死制动系第四类、BODY AND ACCESSORIES 车身及附属装置一、Car body 轿车车身二、All-steel body 全钢车身22三、Car door 轿车车门四、Bus body 大客车车身五、Truck body 货车车身23六、Special-transport vehicle body专用汽车车身七、Cab 驾驶室八、Drivers place 驾驶员位置九、Instrument panel仪表板十、Seat,Safety belt 座椅,安全带十一、Air conditioning 空调24十二、Compressor 压缩机十三、Lighting 照明十四、Head Lamp 前大灯十五、Turnsignal lamp 转向灯25十六、Windshield wiper 风窗刮水器十八、Horn 喇叭十九、Tools 工具2627。
第一类 MOTOR VEHICLE 汽车一、Vehicle classification 汽车分类1.2 Bus 客车1.3 Motor truck 货车1.4 special purpose vehicle 专用汽车二、Vehicle construction 汽车构造2.1 Main components of vehicle 汽车主要组成2.2 Vehicle performance 汽车性能2.3 engine position 发动机布置第二类 ENGINE 发动机一、Engine construction 发动机构造二、Essential term 基本术语六、Valve mechanism 配气机构 6.1 Side valve 侧置气门12.3 Fan,water pump 风扇,水泵发动机润滑系13.1 Pressure lubrication 压力润滑16.1 Rotary piston engine 旋转活塞发动机16.2 Gas turbine 燃气轮机16.3 Stirling engine 斯特林发动机(热气机)第三类 CHASSIS 底盘一、Drive line 传动系1.1 Layout of drive line 传动系示意图1.2 Friction clutch 摩擦离合器1.3 Hydrodynamic coupling 液力偶合器 1.4 Gearbox-housing 变速器外壳1.7 Automatic transmission 自动变速器1.15 Half-axle,rear axle housing2.1 Layout of main components 主要组成示2.4 Wheel 车轮2.5 Tire 轮胎2.7 Front wheel independent suspension前轮独立悬架 2.10 Air suspension 空气悬架三、Steering system 转向系Mechanical steering system 机械转向系3.3 Steering mechanism 转向机构 3.5 Power steering 动力转向3.6 steering linkage 转向杆系四、 Braking system 制动系4.1 Braking principles 制动原理4.2 Drum brake制动主缸,制动轮缸第四类、BODY AND ACCESSORIES 车身及附属装置一、Car body 轿车车身二、All-steel body 全钢车身四、Bus body 大客车车身七、Cab 驾驶室十二、Compressor 压缩机十三、Lighting 照明十四、Head Lamp 前大灯十五、Turnsignal lamp 转向灯。
汽车专业英语汇总一、Vehicle classification 汽车分类1.1 Car 轿车1.2 Bus 客车1.3 Motor truck 货车1.4 special purpose vehicle 专用汽车二、Vehicle construction 汽车构造2.1 Main components of vehicle 汽车主要组成2.2 Vehicle performance 汽车性能2.3 engine position 发动机布置三、Vehicle dimensions 汽车尺寸四、ENGINE 发动机Engine-lubrication system 发动机润滑系统 Engine-ignition system 发动机点火系其他:汽车种类diesel 柴油机limousine 豪华轿车drophead 活动车篷汽车racing car 赛车saloon 轿车roadster 敞蓬车beat-up car, jalopy 老爷车notchback 客货两用车four-wheel drive 四轮驱动front-wheel drive 前轮驱动trailer 拖车station wagon 小旅行车truck 卡车compact car 小型汽车light-van 小型货车garbage truck 垃圾车automobile carrier 货运卡车fire engine 消防车tractor 牵引车ambulance 救护车taxi 出租车, 计程车trailer truck 拖车sports car 跑车formula car 方程式赛车, 方程式汽车mail car 邮车jeep 吉普车bloodmobile 血浆车bumper car 碰撞用汽车camper 露营车police car 警车wrecker 清障车ambulance 急救车汽车外设front wheel 前轮rear wheel 后轮tread 轮距chassis 底盘bodywork, body 车身rear window 后窗玻璃windscreen 挡风玻璃windscreen wiper 雨刮器fender, wing, mudguard 挡泥板radiator grille 水箱wing mirror 后视镜bonnet 发动机盖boot 行李箱roof rack, luggage rack 行李架license plate, number plate 车号牌wing 前翼子板hubcap 轮毂罩bumper 保险杠front blinker 前信号灯taillight, tail lamp 尾灯backup light, reversing light 倒车灯stoplight, stop lamp 刹车灯rear blinker 转弯指示灯trunk, boot 行李箱bumper 保险杠tailpipe 排气管汽车内部first gear 一档second gear 二档reverse 倒车档two-stroke engine 二冲程发动机back seat, rear seat 后座driver’s seat, driving seat 驾驶席passenger seat 旅客席steering wheel, wheel 方向盘rear-view mirror, driving mirror 后视镜horn, hooter 喇叭choke 熄火装置gear stick, gear change 变速杆gearbox 变速箱[starter, self-starter 起动器,起动钮brake pedal 刹车踏板clutch pedal 离合器踏板hand brake 手制动器foot brake 脚制动器dashboard 仪表板milometer 里程表speedometer, clock 速度表transmission 传动piston 活塞radiator 散热器shaft 传动轴drain tap 排气阀门silencer 消音器tank 油箱overflow 溢流孔valve 阀门exhaust pipe 排气管spare wheel 备胎,备用轮胎carburetor 汽化器。
更多汽车资料请访问中国汽车技术论坛:CHAPTER 1 AUTOMOTIVE BASICS1.1 Principal ComponentsToday's average car contains more than 15,000 separate, individual parts that must work together. These parts can grouped into four major categories: engine, body, chassis and electrical equipment.1.2 EngineThe engine acts as the power unit. The internal combustion engine is most common: this obtains its power by burning a liquid fuel inside the engine cylinder. There are two types of engine :gasoline(also called a spark-ignition engine) and diesel(also called a compression-ignition engine).Both engines are called heat engines; the burning fuel generates heat which causes the gas inside the cylinder to increase its pressure and supply power to rotate a shaft connected to the transmission.1.3 BodyAn automobile body is a sheet metal shell with windows, doors, a hood, and a trunk deck built into it. It provides a protective covering for the engine, passengers, and cargo. The body is designed to keep passengers safe and comfortable. The body styling provides an attractive, colorful, modern appearance for the vehicle.1.4 ChassisThe chassis is an assembly of those systems that are the major operating part of a vehicle. The chassis includes the transmission, suspension, steering, and brake systems.Transmission system s ― conveys the drive to the wheels. The main components are clutch, gearbox, driveshaft, final drive, and differential.Suspension― absorbs the road shocks.Steering― controls the direction of the movem ent.Brake― slows down the vehicle.1.5 Electrical EquipmentThe electrical system supplies electricity for the ignition, horn, lights, heater, and starter. The electricity level is maintained by a charging circuit. This circuit consists of the battery, alternator (or generator). The battery stores electricity. The alternator changes the engine's mechanical energy into electrical energy and recharges the battery.New WordsPrincipal component 主要部件category 种类,类型body 车身chassis 底盘layout 布置power unit 动力装置internal combustion engine 内燃机cylinder 汽缸gasoline 汽油spark 火花ignition 点燃,点火diesel 柴油机compression 压缩shaft 轴transmission 传动系sheet metal 金属板shell 外壳hood (发动机)罩trunk deck 行李舱盖cargo 货物styling 样式assembly 总成,装配suspension 悬挂,悬置shock 冲击steering 转向,操纵brake 刹车,制动器clutch 离合器gearbox 变速器driveshaft 传动轴final drive 主减速器,后桥differential 差速器slow down (使)慢下来,减速horn 喇叭starter 起动机charge 充电alternator 交流发电机Review Questions1.List the main parts of an automobile?2.What are the common types of a vehicle according to body styling?3.Which systems does a chassis include and what are the main functions of the chassis?4.Why are suspension systems used on vehicles?CHAPTER2 INTERNAL COMBUSTION ENGINE2.1 principle of operation2.1.1 Engine and powerEngine is used to produce power. The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. This process is called combustion. If engine combustion occurs with the power chamber. ,the engine is called internal combustion engine. If combustion takes place outside the cylinder, the engine is called an external combustion engine.Engine used in automobiles are internal combustion heat engines. Heat energy released in the combustion chamber raises the temperature of the combustion gases with the chamber. Theincrease in gas temperature causes the pressure of the gases to increase. The pressure developed within the combustion chamber is applied to the head of a piston to produce a usable mechanical force, which is then converted into useful mechanical power.2.1.2 Engine TermsLinking the piston by a connecting rod to a crankshaft causes the gas to rotate the shaft through half a turn. The power stroke “uses up” the gas , so means must be provided to expel the burnt gas and recharge the cylinder with a fresh petrol-air mixture :this control of gas movement is the duty of the valves ;an inlet valve allows the new mixture to enter at the right time and an exhaust valve lets out the burnt gas after the gas has done its job. Engine terms are :TDC(Top Dead Center):the position of the crank and piston when the piston is farther away from the crankshaft.BDC(Bottom Dead Center):the position of the crank and piston when the piston is nearest to the crankshaft.Stroke : the distance between BDC and TDC; stroke is controlled by the crankshaft.Bore : the internal diameter of the cylinder.Swept volume : the volume between TDC and BDC.Engine capacity : this is the swept volume of all the cylinder e.g. a four-stroke having a capacity of two liters(2000cm) has a cylinder swept volume of 50cm.Clearance volume: the volume of the space above the piston when it is at TDC. Compression ratio = (swept vol + clearance vol)\(clearance vol)Two-stroke : a power stroke every revolution of the crank.Four-stroke : a power stroke every other revolution of the crank..2.1.3 The Four-stroke Spark-ignition Engine CycleThe spark-ignition engine is an internal-combustion engine with externally supplied in ignition , which converts the energy contained in the fuel to kinetic energy.The cycle of operations is spread over four piston strokes. To complete the full cycle it takestwo revolutions of the crankshaft. The operating strokes are :This stroke introduces a mixture of atomized gasoline and air into the cylinder. The stroke starts when the piston moves downward from a position near the top of the cylinder. As the piston moves downward, a vacuum, or low-pressure area, is created.During the intake stroke, one of the ports is opened by moving the inlet valve. The exhaust valve remains tightly closed.Compression strokeAs the piston moves upward to compress the fuel mixture trapped in the cylinder, the valves are closed tightly. This compression action heats the air/fuel mixture slightly and confines it within a small area called the combustion chamber.Power strokeJust before the piston reaches the top of its compression stroke, an electrical spark is introduced from a spark plug screwed into the cylinder head.The spark ignites the compressed, heated mixture of fuel and air in the combustion chamber to cause rapid burning. The burning fuel produces intense heat that causes rapid expansion of the gases compressed within the cylinder. This pressure forces the piston downward. The downward stroke turns the crankshaft with great force.Exhaust strokeJust before the bottom of the power stroke, the exhaust valve opens. This allows the piston, as it moves upward, to push the hot, burned gases out through the open exhaust valve. Then, just before the piston reaches its highest point, the exhaust valve closes and the inlet valve opens. As the piston reaches the highest point in the cylinder, known as TDC, it starts back down again. Thus, one cycle ends and another begins immediately.2.1.4 Engine Overall MechanicsThe engine has hundreds of other parts . The major parts of engine are engine block , engine heads, pistons, connecting rods, crankshaft and valves. The other parts are joined to make systems. These systems are the fuel system, intake system, ignition system, cooling system, lubrication system and exhaust system. Each of these systems has a definite function. These systems will discussed in detail later.NEW WORDPiston 活塞Connecting rod 连杆Crankshaft 曲轴Power stoke 活塞行程Expel 排出V alve 气阀inlet(intake) valve 进气阀exhaust valve 排气阀term 术语TDC 上止点BDC 下止点Bore 缸径swept volume 有效容积engine capacity 发动机排量clearance volume 余隙容积,燃烧室容积compression ratio 压缩比revolution 旋转,转数every other 每隔一个cycle 循环spread over 分布,遍及intake stroke 进气行程compression stroke 压缩行程knock 敲缸,敲打exhaust stroke 排气行程engine block 发动机缸体lubrication 润滑2.2 Engine Block and Cylinder Head2.2.1 Engine BlockThe engine block is the basic frame of the engine. All other engine parts either fit inside it or fasten to it. It holds the cylinders, water jackets, and oil galleries. The engine block also holds the crankshaft, which fastens to the bottom of the block. The camshaft also fits inside the block, except on overhead-cam engines (OHC). In most cars, this block is made of gray iron, or an alloy (mixture) of gray iron and other metals, such as nickel or chromium. Engine blocks are castings.Some engine blocks, especially those in smaller cars, are made of cast aluminum. This metal is much lighter than iron. However, iron wears better than aluminum. Therefore, the cylinders in most aluminum engines are lined with iron or steel sleeves. These sleeves are called cylinder sleeves. Some engine blocks are made entirely of aluminum.2.2.2 Cylinder HeadThe cylinder head fastens to the top of the block, just as a roof fits over a house. The underside forms the combustion chamber with the top of the piston. The most common cylinder head types are the hemi, wedge, and semi-hemi. All three of these terms refer to the shape of the engine's combustion chamber. The cylinder head carries the valves, valve springs and the rockers on the rocker shaft, this part of the valve gear being worked by the push-rods. Sometimes the camshaft is fitted directly into the cylinder head and operates on the valves without rockers. This is called an overhead camshaft arrangement. Like the cylinder block, the head is made from either cast iron or aluminum alloy.2.2.3 GasketThe cylinder head is attached to the block with high-tensile steel studs. The joint between the block and the head must be gas-tight so that none of the burning mixture can escape. This is achieved by using cylinder head gasket. This is a sandwich gasket, i.e. a sheet of asbestos between two sheets of copper, both these materials being able to withstand the high temperature and pressures within the engine.2.2.4 Oil Pan or SumpThe oil pan is usually formed of pressed steel. The oil pan and the lower part of the cylinder block together are called the crankcase; they enclose, or encase, the crankshaft. The oil pump in the lubricating system draws oil from the oil pan and sends it to all working parts in the engine. The oil drains off and runs down into the pan. Thus, there is constant circulation of oil between the pan and the working parts of the engine.New Wordsengine block 缸体cylinder head 气缸盖fasten 使固定water jacket 水套oil gallery 油道camshaft 凸轮轴overhead-cam(OHC) 顶置凸轮gray iron 灰铸铁alloy 合金nickel 镍chromium 铬casting 铸件head cover 汽缸盖罩intake manifold 进气总管distributor 分电器oil pan 油底壳aluminum 铝be lined with 镶有cylinder sleeve 气缸套hemi 半球形wedge 楔型,楔入semi-hemi 准半球形rocker 摇臂push-rod 推杆gasket 衬垫high-tensile 高强度的stud 螺栓gas-tight 密封的asbestos 石棉crankcase 曲轴箱,曲柄箱encase 封闭,把…包起来drain off 排出,流出Review Question1.What do TDC, BDC, stroke, compression ratio and engine capacity stand for?2.How do you calculate swept volume and compression ratio?3.What controls the length of the stroke?4.List the main parts of the engine overall mechanics?5.What are the main function of the engine block?2.3 Piston Connecting Rod and Crankshaft2.3.1 Piston AssemblyThe piston is an important part of a four-stroke cycle engine. Most pistons are made from cast aluminum. The piston , through the connecting rod, transfers to the crankshaft the force create by the burning fuel mixture. This force turns the crankshaft .Thin, circular , steel bands fit into grooves around the piston to seal the bottom of the combustion chamber. These bands are called piston rings. The grooves into which they fit are called ring grooves. A piston pin fits into a round hole in the piston . The piston pin joins the piston to the connecting rod . The thick part of the piston that holds the piston is the pin boss.The piston itself , its rings and the piston pin are together called the piston assembly.2.3.2.PistonTo withstand the heat of the combustion chamber, the piston must be strong. It also must be light, since it travels at high speeds as it moves up and down inside the cylinder. The piston is hollow. It is thick at the top where it take the brunt of the heat and the expansion force. It is thin at the bottom, where there is less heat. The top part of the piston is the head , or crown . The thin part is the skirt The sections between the ring grooves are called ring lands.The piston crown may be flat , concave ,dome or recessed . In diesel engine , the combustion chamber may be formed totally or in part in the piston crown , depending on the method of injection . So they use pistons with different shapes.2.3.3Piston RingsAs Fig.2-9 shows , piston rings fit into ring grooves near the of the piston. In simplest terms, piston rings are thin, circular pieces of metal that fit into grooves in the tops of the pistons.In modern engines ,each piston has three rings. (Piston in older engines sometimes had four rings, or even five.) The ring‟s outside surface presses against the cylinder walls. Rings provide the needed seal between the piston and the cylinder walls. That is, only the rings contact the cylinder walls. The top two rings are to keep the gases in the cylinder and are called compression rings. The lower one prevents the oil splashed onto the cylinder bore from entering the combustion chamber , and is called an oil ring. Chrome-face cast-iron compression rings are commonly used in automobile engines. The chrome face provide a very smooth , wear-resistant surface.During the power stoke , combustion pressure on the combustion rings is very high. It causes them to untwist . Some of the high-pressure gas gets in back of the rings. This force the ring face into full contact with the cylinder wall. The combustion pressure also holds the bottom of the ring tightly against the bottom of the ring groove. Therefore , high combustion pressure causes a tighter seal between the ring face and the cylinder wall.2.3.4 Piston PinThe piston pin holds together the piston and the connecting rod . This pin fits into the piston pin holes and into a hole in the top end of the connecting rod. The top end of is much smaller than the end that fits on the crankshaft . This small end fitsinside the bottom of the piston . The piston pinfits through one side of the piston , through thesmall end of the rod , and then through the otherside of the piston . It holds the rod firmly in place inthe center of the piston. Pins are made ofhigh-strengh steel and have a hollow center . Manypins are chrome-plated to help them wear better.2.3.3 Connecting rodThe connecting rod is made of forged high-strengthsteel . It transmits and motion from the piston to the crankpin on the crankshaft . The connecting rod little end is connected to the piston pin . A bush made from a soft metal , such as bronze , is used for this joint . The lower end of the connecting rod fits the crankshaft journal . This is called the big end . For this big-end bearing , steel-backed lead or tin shell bearing are used . These are the same as those used for the main bearings . The split of the big end is sometimes at an angle , so that it is small enough to be withdrawn through the cylinder bore . The connecting rod is made from forged alloy steel .2.3.5 CrankshaftThe crankshaft , in conjunction with the connecting rod , coverts the reciprocating motion of the piston to the rotary motion needed to drive the vehicle . It is usually made from carbon steel which is alloyed with a small proportion of nickel .The main bearing journals fit into the cylinder block and the big end journals align with the connecting rods .At the rear end of the crankshaft is attached the flywheel , and at the front end are the driving whells for the timing gears , fan , cooling water and alternator .The throw of the crankshaft , the distance between the main journal and the big end centers , controls the length of the stroke . The stroke is double the throw , and the stroke-length is the distance that the piston travels from TDC to BDC and vice versa .2.3.6 FlywheelThe flywheel is the made from carbon steel . It fit s onto the rear of the crankshaft . As well as keeping the engine rotating between power strokes it also carries the clutch , which transmits the drive to the transmission , and has the starter ring gear around its circumference . There is only one working stroke in four so a flywheel is needed to drive the crankshaft during the time that the engine is performing the non-power strokes .New W ords Comprise 由。