汽车系统构造英文版Lesson14SuspensionSystem
汽车构造英语
The Complexities of Automobile Construction The automobile, a product of technological innovation and engineering genius, has transformed our world. Its history, rich with pivotal moments and influential innovators, began in the late 19th century and has since become a ubiquitous fixture of modern life. This article delves into the intricacies of automobile construction, highlighting key components, systems, and recent technological advancements.Essential Components of an AutomobileAn automobile is composed of numerous parts, each serving a specific function. The engine, often considered the heart of the car, generates power. The chassis supports the body and houses the mechanical components. The seats, along with the interior, provide a comfortable environment for occupants.Engine Systems: The Heart of the MatterEngines are classified as internal combustion (IC) or external combustion (EC). IC engines, such as gasoline and diesel engines, are more common in modern automobiles. They operate by mixing fuel with air, igniting the mixture, and harnessing the resulting expansion to create power. Diesel engines are more efficient but emit more noise and pollution. Gasoline engines, on the other hand, offer smoother operation but are less fuel-efficient.Chassis Systems: The Backbone of the VehicleThe chassis supports the car's structure and contains critical systems like the suspension and braking. The suspension system absorbs road shocks, improving ride quality and tire contact with the road. The braking system converts kinetic energy into heat,slowing or stopping the car. Both systems are carefully designed to offer a balance between performance and comfort.Seating and Interior: Comfort and ErgonomicsSeats are designed to offer support and comfort, often with the help of ergonomic principles. Materials like leather, vinyl, and fabric are chosen for durability, comfort, and aesthetics. The interior, which includes dashboards, door panels, and carpeting, is equally important in creating a pleasant driving environment.Emerging Technologies in Automotive ConstructionRecent technological advancements have revolutionized the automotive industry. Autonomous vehicles, enabled by advances in sensor technology, artificial intelligence, and computer vision, promise safer, more efficient driving. Electric and hybrid vehicles, driven by batteries and alternative fuels, are becoming increasingly popular due to their environmental benefits.Environmental Considerations in Automotive DesignConsumers are increasingly concerned with the environmental impact of their purchases. Automobile manufacturers are responding with more fuel-efficient vehicles and eco-friendly materials. Consumers can further contribute by selecting vehicles with low emissions and recycling old cars.ConclusionUnderstanding the intricacies of automobile construction is essential for appreciating the engineering feats that underlie our modern way of life. It also informs responsible consumer choices, vital for sustainable development. As technology continues to evolve, the future of the automobile promises to be even more exciting and innovative.。
汽车英语悬架系统(suspension system)
The characteristics of nonindependent suspension
• Simple structure（结构简单） • Low cost（成本低） • Simple fabrication process（制作工艺简单）
The type of suspension
• Independent suspension（独立悬架） • non-independent suspension（非独立悬架）
The characteristics of independent on
• Comfortable（舒适性好） • Reasonable structure（结构紧凑） • Beneficial for shift/turning （有利于转向） • Light weight, wheels’ firm contact with
Graphic Suspension
(横向推力杆) Coil spring （线圈弹簧） Sock absorber（减震器H）orizontal thrust rod
(横向稳定器) Horizontal stabilizer
Cross member（横梁） Vertical thrust rod (纵向推力杆)
Suspension system components
• Shock absorber • Coil spring • Lower control arm • Cross member • Trailing arm • Stub axle • Steering knuckle
（减震器） （线圈弹簧） （下控制臂）
Unit 5
Suspension System
汽车构造英文版版
汽车构造英文版-免费下载版CHAPTER 1 AUTOMOTIVE BASICS? 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.? 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.? 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.? 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.Brak e― slows down the vehicle.? 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 automobile2.What are the common types of a vehicle according to body styling3.Which systems does a chassis include and what are the main functions of the chassis4.Why are suspension systems used on vehiclesCHAPTER2 INTERNAL COMBUSTION ENGINEprinciple 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 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 . 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-strokeSpark-ignition Engine CycleThe spark-ignition engine is aninternal-combustion engine with externallysupplied in ignition , which converts theenergy contained in the fuel to kineticenergy.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.? 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.? 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, . a sheet of asbestos between two sheets of copper, both these materials being able to withstand the high temperature and pressures within the engine.? 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 for2.How do you calculate swept volume and compression ratio3.What controls the length of the stroke4.List the main parts of the engine overall mechanics5.What are the main function of the engine blockPiston 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 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 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 thereciprocating motion of the piston to the rotary motion needed to drive thevehicle . It is usually made from carbon steel which is alloyed with asmall proportion of nickel .The main bearing journals fit into the cylinderblock and the big end journals align with the connecting rods .At the rearend of the crankshaft is attached the flywheel , and at the front end are thedriving whells for the timing gears , fan , cooling water and alternator .The throw of the crankshaft , the distance between the mainjournal and the big end centers , controls the length of the stroke . Thestroke is double the throw , and the stroke-length is the distance that thepiston 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 WordsComprise 由。
汽车结构中英文详解
1.2.7 lubrication system润滑系统
发动机作为动力设备，常见的类 型是内燃机，其原理是通过发动机 缸内的液体燃料燃烧而产生能量。 发动机可分为两类：汽油机和柴油机
1.1The basic performance principle of four-stroke gasoline engine 四冲程汽油机基本工作原理
1.Intake stroke 吸气行程 pression stroke 压缩行程 3.Working stroke 做功行程 4.Exhaust stroke 排气行程
2.2 Steering system 转向系统
The direction motion of vehicle is controlled by a steering system. A basic steering system has 3 main parts: steering control mechanism, steering gear ,steering linkage mechanism which connecting wheels and steering gear.
To ensure the normal operation of the engine, the surfaces of relative motion parts of the engine must be lubricated.
为保证发动机的正常工作，必须对发动机
Suspension-汽车构造
Review ３: List the main types of Suspension Springs
Coil Spring Torsion Bar Rubber Spring
Leaf Spring
(laminated spring)
Air Spring Hydropneumatic Spring
coil spring 螺旋弹簧
中心螺栓 Center bolt
弹簧夹 Rebound clap 卷 耳 Spring ear
Leaf springs are made of long, flat pieces of metal clamped together to form a spring. The spring not only acts as a spring but also locates the axle. To overcome weakness at the mid-point of the main leaf, either the leaf is made thicker at the center or a series of leaves is used. Each leaf is shorter than the one directly above it.
tie rod
stabilizer bar shock absorber
coil spring
trailing control
Review 1: What’s the function of Suspension system?
Review 1: What’s the function of Suspension system? Flexibly connect the wheels to the body Deliver the power and moment from the road to the body
汽车构造英文版-免费下载版
汽车构造英文版-免费下载版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 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.Br ake― 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. 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 produce a usable mechanicalforce, 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 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 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 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 Words Comprise 由。
Automobile Suspension System by Jelly
CONVENTIONAL SUSPENSION SYSTEM
Two wheels are mounted on either side of the rigid axle When one wheel encounters the bump, both the wheel do not execute parallel up and down motion So it gives rise to gyroscopic effect and wheel wobble Rear driving wheels mounted on live axle suspended by laminated leaf springs and shock absorbers
AIR SUSPENSION
Comprises of compressor , suppling air to air tank Pressure maintained – 5.6 to 7 kg/sq.m Air bags – on each wheel As load applied , air bags compressed actuating the levelling valve . Air from the tank fills the compressrd air bag & hence raise the level of the frame. Air from air bag gets released as load on chassis decreases .
Type of double-A arm suspension although the lower arm in these systems can sometimes be replaced with a single solid arm (as in my picture). The spring/shock combo is moved from between the arms to above the upper arm. This transfers the load-bearing capability of the suspension almost entirely to the upper arm and the spring mounts. The lower arm in this instance becomes a control arm.
汽车系统构造英文版-Lesson14SuspensionSystem31页PPT
• The secondary leaves are placed underneath the main leaf, and the assembly is held together near the ends by alignment clips and, in the center, by two U-bolts and a plate. The U-bolt and plate assembly also fastens the differential and rear axle housing to, and aligns it with, the spring. Thin interliners are installed between the spring leaves to eliminate noise and to enable the leaves to move freely against each other.
• Whenever power is transmitted to the rear wheels of a vehicle equipped with a Hotchkiss drive system, the wheels attempt to force the differential and rear axle housing to turn in the direction opposite from wheel rotation. Leaf springs control this torque and prevent damage to the drive line and rear suspension system.
• Spring-loaded valves open to permit quicker flow of the fluid if fluid pressure rises high enough, as it may when rapid wheel movements take place. Most automotive vehicles use gas-filled shock absorbers in which the air space above the fluid is filled with a pressurized gas such as nitrogen. The gas pressure on the fluid reduces the creation of air bubbles and foaming.
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Front-wheel-drive car with MacPherson-strut front suspension and strut-type independent rear suspension. (Saturn Corp.)
• A telescoping hydraulic damper, known as a shock absorber, is mounted separately or in the strut at each wheel to restrain spring movement and prevent prolonged spring oscillations. The shock absorber contains a piston that moves in a cylinder as the wheel moves up and down with respect to the vehicle body or frame. As the piston moves, it forces a fluid through an orifice, imposing a restraint on the spring.
• Spring-loaded valves open to permit quicker flow of the fluid if fluid pressure rises high enough, as it may when rapid wheel movements take place. Most automotive vehicles use gas-filled shock absorbers in which the air space above the fluid is filled with a pressurized gas such as nitrogen. The gas pressure on the fluid reduces the creation of air bubbles and foaming.
• Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels. Suspension systems serve a dual purpose – contributing to the car's roadholding/handling and braking for good active safety and driving pleasure, and keeping vehicle occupants comfortable and reasonably well isolated from road noise, bumps, and vibrations,etc.
• Most automotive vehicles have independent front suspension, usually using coil springs as part of either a short-arm long-arm or a MacPherson-strut suspension system. A MacPherson-strut suspension (see illustration) combines a coil spring and shock absorber into a strut assembly that requires only a beam-type lower control aion system for a vehicle with front-engine and front-wheel drive (see illustration), the weight of the vehicle applies an initial compression to the coil springs. When the tires and wheels encounter irregularities in the road, the springs further compress or expand to absorb most of the shock. The suspension at the rear wheels is usually simpler than for the front wheels, which require multiple-point attachments so the wheels can move up and down while swinging from side to side for steering.
• These goals are generally at odds, so the tuning of suspensions involves finding the right compromise. It is important for the suspension to keep the road wheel in contact with the road surface as much as possible, because all the forces acting on the vehicle do so through the contact patches of the tyres. The suspension also protects the vehicle itself and any cargo or luggage from damage and wear. The design of front and rear suspension of a car may be different.