On-Demand Transportation has become a mandatory capability for today's successful 3PL providers in offering client specific solutions to supply chain needs.
正在做这个项目,不过没有英文。
物流一词源于英文的”logistics”,原意是军事后勤保障,在第二方世界大战以后被广泛地应用于经济领域。美国物流管理协会对物流的定义为”物流是为满足消费者需求而进行的对原材料、中间产品、最终产品及相关信息从起始地到消费地的有效流动与存储的、实施和控制的过程”。物流由四个关键部分组成:实质流动、实质存储、信息流动及管理协调。物流的主要功能是创造时间效用和空间效用,主要方式是通过仓储克服空间距离。第三方物流是在物流渠道中由中间商提供的服务,中间商以合同的形式在一定期限内提供需的全部或部分物流服务。第三方物流公司是一个为外部客户管理、控制和提供物流服务作业的公司。据统计,欧洲目前使用第三方物流服务的比例为76%,美国约为58%,且其需求仍在增长;欧洲24%和美国33%的非第三方物流服务用户正在积极考虑使用第三方物流服务。第三方物流作为一个提高物资流通速度、节省仓储费用和资金在途费用的有效手段,已经越来越引起人们的高度重视。一、使用第三方物流的优越性使用第三方物流产可以给企业带来众多益处,主要表现在:1、集中主业生产企业使用第三方物流可以使企业实现资源的优化配置,将有限的人力、财力集中于核心精力,进行重点研究,发展基本技术,开发新产品参与世界竞争,增强企业的核心竞争力。2、节省费用专业的第三方物流提供者利用规模生产的专业优势和成本优势,通过提供各环节能力的利用率实现费用节省,使企业能从分离费用结构中获益。生产企业随着规模的不断扩大,对营销服务的任何程度的深入参与,都会引起费用的大幅度增长,只有使用专业服务公司提供的公共服务,才能够减少额外损失。根据美国田纳西大学、英国EXEL公司和美国EMST&YOUNG咨询公司共同组织的一项调查显示:很多货主表示,使用第三方物流使他们的物流成本平均下降了%,货物周转期平均从天缩短到天,库存降低了%。3、减少库存第三方物流服务提供者借助精心策划的物流和适时的运送手段,最大限度地减少库存,改善了企业的现金流量,实现成本优势。4、提升企业形象第三方物流服务提供与顾客是一种战略伙伴关系,第三方物流提供者利用完备的设施和训练有素的员工对整个供应链实现完全的控制,减少物流的复杂性,通过自己的网络体系帮助顾客改进服务,不仅树立自己的品牌形象,而且使顾客在竞争中脱颖而出。二、我国企业在使用第三方物流方面存在的问题尽管与第三方物流公司合作有很多优势,但是很多企业并不是将更多的物流业务外包出去,原因归结为:1、抵制变化很多公司不愿意通过物流外包的方式来改变现在的精力模式。尤其是一些国有企业,物流业务外包还将意味着解雇大批员工,这对于国有企业的管理者来说意味着一个非常大的风险。2、缺乏认识企业对于第三方物流公司的认识程度普遍还很低,企业没有认识到供应链管理在企业竞争中的巨大作用。3、害怕失去控制由于供应链的实施在提高公司竞争力方面的重要作用,很多公司宁愿有一个小而全的物流部门,也不情愿将这些功能交给别人,主要原因是担心如果失去内部物流能力,会在客户交往和其他方面过度依赖第三方物流公司。4、物流业务外包本身有其复杂性供应链物流业务通常和公司其他业务,如财务、营销或生产集成在一起,物流业务外包本身就具有复杂性。对一些实际业务,包括运输和仓储的集成可能会带来组织上、行政上和实施上的一系列问题。此外,公司内部信息系统的集成性特点,使得把物流业务交给第三方物流公司来运作变得很困难。5、衡量物流外包的效果受诸多因素的影响准确地衡量物流成本对信息技术和人力资源的影响比较困难。很难确定物流业务外包到底能够给企业带来多少潜在的成本好外。另外,各个公司业务的独特性和公司供应链作业能力,通常被认为是不宜向外部公开的内部信息,很难准确地比较公司间的供应链作业能力。尽管有些生产企业已经意识到利用第三方物流可以给企业带来很多好外,但是在实际应用时往往分成几个步骤,同时选择数个物流服务提供商作为合作伙伴,以避免将业务交由一个物流服务提供商而带来的依赖性。三、我国第三方物流企业在发展中遇到的问题一个成功的物流企业,必须具备较大的运营规模,建立有效地地区覆盖区域,具有强大的指挥和控制中心,具备高水准的综合技术、财务资源和经营策略。我国第三方物流企业在发展中遇到的问题可以归纳如下:1、运营模式问题目前世界大型物流公司大都采取总公司与分公司体制,总部采取集权式物流运作,以业务实行垂直管理。建立现代物流企业必须有一个能力很强、指挥灵活的调控中心对整个物流业务进行控制与协调。真正的现代物流必须是一个指挥中心、一个利润中心,企业的组织、框架、体制等形式都要与一个中心相匹配。我国的物流企业在运营模式上存在问题,国外物流企业的管理模式值得国内物流企业借鉴。2、仓储或运输能力欠缺物流的主要功能是创造时间盗用和空间效用。就目前中国的第三方物流企业而言,有些公司偏重于仓储,运输能力不足;另外一些公司则是运输车辆很多而在全国没有多少仓库,靠租用社会仓库来完成对客户的承诺。3、网络问题我国有几家大的物流企业拥有全车性的仓储网络或货运网络,但是这个网络的覆盖区域并不是十全十美的。客户在选择物流合作伙伴时,很关注网络的覆盖区域及网络网点的密度问题。有关网点的建设问题应引起物流企业的重视。4、信息技术世界大的物流企业都拥有”一流三网”,即订单信息流、全球供应链资源网络、全球用户资源网络和计算机信息网络。凭借先进的计算机管理技术,这些物流客户也是高附加值产品的生产企业,国内物流企业必须在信息系统上增加投入才可以改变自己的市场定位。集中与整合是第三方物流企业的发展趋势。原因是:第一,大的公司有意将供应链的主要环节外包给尽可能少的几家物流公司;第二,建立一个高效的全球第三方物流企业所需资本的投入日益增加;第三,许多第三方物流供应商都通过兼并和联合的方式来扩大其服务能力。Logistics from the English word "logistics", the original intent of the military logistics support, in the second side after World War II has been widely used in the economic field. Logistics Management Association of the United States is defined as the logistics, "Logistics is to meet the needs of consumers of raw materials, intermediate products, final products and related information to the consumer from the beginning to the effective flow and storage, implementation and control of the process of . "Logistics consists of four key components: the real flow, real storage, and management to coordinate the flow of information. The primary function of logistics is to create time and space effectiveness of the effectiveness of the main ways to overcome the space through the storage logistics in the logistics channel services provided by brokers, middlemen in the form of the contract within a certain period of time required to provide logistics services in whole or in part. Is a third-party logistics companies for the external customer management, control and operation of the provision of logistics services to statistics, currently used in Europe the proportion of third-party logistics services for 76 percent, the United States is about 58%, and the demand is still growing; 24 percent in Europe and the United States 33% of non-third-party logistics service users are actively considering the use of third-party logistics services. As a third-party logistics to improve the speed of material flow, warehousing costs and financial savings in the cost effective means of passers-by, has become increasingly attracted great , the advantages of using a third-party logisticsThe use of third-party logistics enterprises can yield many benefits, mainly reflected in:1, focus on core businessManufacturers can use a third-party logistics companies to achieve optimal distribution of resources, limited human and financial resources to concentrate on their core energy, to focus on the development of basic skills, develop new products in the world competition, and enhance the core competitiveness of , cost-savingProfessional use of third-party logistics providers, the professional advantages of mass production and cost advantages, by providing the link capacity utilization to achieve cost savings, so that enterprises can benefit from the separation of the cost structure. Manufacturing enterprises with the expansion of marketing services to participate in any degree of depth, would give rise to a substantial increase in costs, only the use of professional services provided by public services, in order to minimize additional losses. University of Tennessee in accordance with the United States, United Kingdom and the United States EXEL company EMST & YOUNG consulting firm co-organized a survey: a lot of cargo that enable them to use third-party logistics logistics costs declined by an average of percent, the average flow of goods from days to days, stock , reduction of inventoryThird-party logistics service providers with well-planned logistics and timely delivery means, to minimize inventory, improve cash flow of the enterprise to achieve cost , enhance the corporate imageThird-party logistics service providers and customers is a strategic partnership, the use of third-party logistics provider of comprehensive facilities and trained staff on the whole supply chain to achieve complete control, reducing the complexity of logistics, through their own networks to help improve customer service, not only to establish their own brand image, but also customers in the , China's enterprises in the use of third-party logistics problems inWhile third-party logistics company has many advantages, but not many enterprises will be more outsourcing of the logistics business, the reasons boil down to:1, resistance to changeMany companies do not want the way through the logistics outsourcing efforts to change the current mode. In particular, some state-owned enterprises, wereFlow will also mean that the dismissal of outsourcing a large number of employees, which the managers of state-owned enterprises would mean a very great , lack of awarenessFor third-party logistics enterprise's generally low level of awareness, lack of awareness of enterprise supply chain management in the enterprise of the great role in the , fear of losing controlAs a result of the implementation of supply chain companies in enhancing the competitiveness of the important role that many companies would rather have a small but complete logistics department and they do not prefer these functions will be handed over to others, the main reasons it is worried that if they lose the internal logistics capabilities, customers will be exchanges and over-reliance on other third-party logistics , the logistics outsourcing has its own complexitySupply chain logistics business and companies are usually other services, such as finance, marketing or production of integrated logistics outsourcing itself with complexity. On a number of practical business, including the integration of transport and storage may lead to organizational, administrative and implementation problems. In addition, the company's internal information system integration features, making the logistics business to a third party logistics companies have become very difficult to , to measure the effect of logistics outsourcing by many factorsAccurately measure the cost of information technology, logistics and human resources more difficult. It is difficult to determine the logistics outsourcing companies in the end be able to bring the cost of how many potential good things. In addition, all the uniqueness of the company's business and corporate supply chain operational capability, is usually not considered to be internal to the external public information, it is difficult to accurately compare the inter-company supply chain operational some manufacturers have been aware of the use of third-party logistics companies can bring a lot of good things, but in practical applications are often divided into several steps, at the same time choose a number of logistics service providers as partners in order to avoid the business by a logistics service providers brought about by , China's third-party logistics companies in the development of the problems encounteredA successful logistics company, the operator must have a larger scale, the establishment of effective regional coverage area, with a strong command and control center with the high standard of integrated technical, financial resources and business 's third-party logistics companies in the development of the problems encountered can be summarized as follows:1, operating modelAt present, most of the world's largest logistics companies take the head office and branch system, centralized headquarters-style logistics operation to take to the implementation of vertical business management. The establishment of a modern logistics enterprise must have a strong, flexible command and control center to control the entire logistics operations and coordination. Real must be a modern logistics center, a profit center, business organizations, the framework, the institutional form of every match with a center. China's logistics enterprises in the operating mode of the problems of foreign logistics enterprises in the management model should be from the domestic logistics , the lack of storage or transport capacityThe primary function of logistics is to create time and space utility theft. For now China's third-party logistics enterprises, some companies focus on storage, lack of transport capacity; other companies is a lot of transport vehicles and warehouses throughout the country little by renting warehouses to complete the community's commitment to , network problemsThere are a few large companies have the logistics of the entire vehicle cargo storage network or networks, but the network coverage area is not perfect. Customers in the choice of logistics partner, are very concerned about network coverage and network of regional branches of the density problem. The building of the network should be of great importance to logistics , information technologyThe world's largest logistics enterprises have "three-class network", that is, orders for information flow, resources, global supply chain network, the global Resource Network users and computer information network. With the management of advanced computer technology, these customers are also the logistics of the production of high value-added products business, the domestic logistics enterprises must increase investment in information systems can change their market and integration is the third-party logistics trends in the development of enterprises. The reasons are: firstly, the company intends to major aspects of supply chain outsourcing to the lowest possible number of several logistics companies; the second, the establishment of an efficient global third party logistics inputs required for increasing the capital; the third Many third-party logistics providers through mergers and joint approaches to expand its service capabilities.可以给我分了吧? 嘿嘿
童鞋你好!这个估计需要自己搜索了!网上基本很难找到免费给你服务的!我在这里给你点搜索国际上常用的外文数据库:----------------------------------------------------------❶ISI web of knowledge Engineering Village2❷Elsevier SDOL数据库 IEEE/IEE(IEL)❸EBSCOhost RSC英国皇家化学学会❹ACM美国计算机学会 ASCE美国土木工程师学会❺Springer电子期刊 WorldSciNet电子期刊全文库❻Nature周刊 NetLibrary电子图书❼ProQuest学位论文全文数据库❽国道外文专题数据库 CALIS西文期刊目次数据库❾推荐使用ISI web of knowledge Engineering Village2-----------------------------------------------------------中文翻译得自己做了,实在不成就谷歌翻译。弄完之后,自己阅读几遍弄顺了就成啦!学校以及老师都不会看这个东西的!外文翻译不是论文的主要内容!所以,很容易过去的!祝你好运!
“物联网”的英文正是 Internet of Things(IoT)。这是一个将互联网、传统电信网等资讯集合在一起的网络平台,让所有能行使独立功能的普通物体实现互联互通的网络。
物联网将现实世界数位化,应用范围十分广泛。物联网拉近分散的资讯,统整物与物的数位资讯,物联网的应用领域主要包括以下方面:运输和物流领域、健康医疗领域范围、智慧环境(家庭、办公、工厂)领域、个人和社会领域等,具有十分广阔的市场和应用前景。
扩展资料:
物联网的生活应用:
物联网的应用领域涉及到方方面面,在工业、农业、环境、交通、物流、安保等基础设施领域的应用,有效的推动了这些方面的智能化发展,使得有限的资源更加合理的使用分配,从而提高了行业效率、效益。
在家居、医疗健康、教育、金融与服务业、旅游业等与生活息息相关的领域的应用,从服务范围、服务方式到服务的质量等方面都有了极大的改进,大大的提高了人们的生活质量。
在涉及国防军事领域方面,虽然还处在研究探索阶段,但物联网应用带来的影响也不可小觑,大到卫星、导弹、飞机、潜艇等装备系统,小到单兵作战装备,物联网技术的嵌入有效提升了军事智能化、信息化、精准化,极大提升了军事战斗力,是未来军事变革的关键。
参考资料来源:
百度百科-物联网
这是别人的论文,(全英文)看一下吧~another one:有中文的:以上所提供之网站资料仅供参考, 切不可抄袭使用,以免触犯著作权法!祝你论文顺利~
Car partsEngine The engine is a power plant, which provides power to drive the automobile. In most automobile engines,the explosive power of the mixture of air and gasoline drives the pistons.The pistons turn a crankshaft to which they are attached The rotating force of the crankshaft makes the automobile’s wheels turn.Some automobiles are powered by another kind of engine,known as the rotary valve,rotating combustion engine or Wankel engine The rotary valve engine also draws in a mixture of air and fuel, which is then compressed and burnt.A motor revolving in an elliptical chamber is connected to a shaft,Which finally drives the rear wheels.In most automobiles.the engine is mounted at the front end of the car,with the clutch and gearbox immediately behind it;the engine, clutch and gearbox are assembled into a single unit A number of systems are necessary to make an engine work . A lubrication system is neededto reduce friction and prevent engine wear. A cooling system is required to keep the engine’s temperature within safe limits .The engine must be provided with the correct amount of air and fuel by a fuel system. The mixture of air and fuel must be ignited inside the cylinder at just the right time by an ignition system.Finally, an electrical system is required to operate the cranking motor that starts the engine and to provide electrical energy to power engine accessoriesLubrication System An engine has many moving parts which eventually develop wear,as they move against each other.The engine circulates oil between these moving parts to prevent the metal-to-metal contact that results in wear. Parts that are oiled can move more easily with less friction and hence power loss due to friction is minimized.The secondary function of lubricant is to act as a coolant and also as a sealing medium to prevent leakages.Finally,a film of lubricant on the cylinder walls helps the tings in sealing and thus improves the engine’s compressions.Cooling System Due to the combustion of fuel with air inside the cylinder,the temperature of the engine parts increases.This increase of temperature directly affects the engine performance and the life of the engine parts.The cooling system keeps the engine operating at the efficient temperature.Whatever the driving conditions, the system is designed to prevent both overheating and overcooling.Fuel System The main function of the fuel supply system is to provide fuel to the carburetor or injection system at a rate and pressure sufficient to meet engine demands under all conditions of load,speed and gradients encountered by the vehicle.The fuel system must also have enough reserve fuel for several miles of vehicle operation.Ignition System The purpose of the ignition system is to provide assistance for the combustion of fuel either by a high voltage spark or self-ignition in each of the engine’s cylinder at the right time so that the air-fuel mixture can burn completely. The fuel supplied to the combustion chamber must be ignited to deliver power.In a spark—ignition engine an electric spark is used for this purpose.The compression—ignition engine does not require a separate ignition system because the ignition is affected by compression of the mixture to a high pressure. Electrical System The engine’s electrical system provides energy to operate a starting motor and to power all the accessories.The main components of the electrical system are a battery,an alternator, a starting motor, ignition coil and heater.Frame The frame provides a foundation for the engine and the body of the vehicle . The flame is constructed from square or box-shaped steel members strong enough to support the weight of the body and other components. The automobile frame is usually made up of a number of members welded or riveted together to give the final shape.The engine is mounted on the frame with rubber pads which absorb vibrations and also provide damping of these vibrations.Absorption and damping of vibrations protects passengers from discomfort caused by shocks. The frame is supported on wheel axles by means of springs.This whole assembly is calledthe chassis. Suspension System The function of the suspension system is to absorb vibrations due to the up and down motion of wheels.caused by the irregularities in the road surface . The springs, connecting linkages.and shock absorber comprise the suspension system of a vehicle.The suspension system is of two types: (1)Rigid system(2)Independent systemIn the rigid system, the road springs are attached to a rigid beam axle. It is mostly used in the front axle of commercial vehicles and in the car axle of all types of independent system does not have a rigid axle. Each wheel is free to move vertically without any reaction on its mating wheel. The independent system is mostly used in small cars Power TrainThe power train carries the power that the engine produces to the car wheels. It consists of the clutch (on cars with a manual transmission), transmission (a system of gears that increases the turning effort of the engine to move the automobile ),drive shaft, differential and rear clutch is required with the manual transmission system to temporarily disconnect the engine from wheels. Such disengagement of the power train from the engine is essential while changing the gear ratio or while stopping the main function of the transmission is to provide the necessary variation to the torque applied by the engine to the wheels. This is achieved by changing the gearing ratio between the engine output shaft and the drive ShaftThe drive shaft or propeller connects the gearbox and the differential unit. The drive shaft has universal joints at its ends.DifferentialThe function of the differential is to split the power received from the propeller shaft to the rear axle shaft. It allows the rear wheels to be driven at different speeds when the vehicle takes a bend or falls into a ditch. AxlesAxles are the shafts on which road wheels are mounted. The road wheels are provided with the required drive through these axles.WheelThe automobile wheels take the load of the vehicle and also produce tractive force to move the vehicle. The wheels are also used for retardation and for stopping the SystemThe steering system is used for changing the direction of the vehicle .The major requirements in any steering mechanism are that it should be precise and easy to handle, and that the front wheels should have a tendency to return to the straight-ahead position after a turn. A gear mechanism, which is known as steering gear, is used in this system to increase the steering effort provided by the driver. This system makes the vehicle steering very easy as the driver does not have to put in much effort.Vehicle steering is not only required on a curved road but also while maneuvering on the busy traffic roads.The steering system allows the vehicle to be guided i.e.to be turned left or right. Braking SystemBrakes are required for slowing down or stopping a moving vehicle.The braking system may be operated mechanically or hydraulically. 95 percent of the braking systems in use today are of the hydraulic brake consist of two members.one rotating and the other stationary.There are various means by which the two member call be brought in contact,thus reducing the speed of the major components of the braking system are:brake pedal, master cylinder, wheel Cylinder, brake pipe,brake shoes.brake packing plant and linkages.As the load on the vehicle and the vehicle speed has increased according to recent trends.in modem days, the importance of the braking system has also increased and power brakes are now being preferred.Power brakes utilize vacuum and air pressure to provide most of the brake————applying effort.汽车部件发动机发动机是一种动力机械设备.它为汽车提供动力。在大部分汽车发动机中.空气和汽油的混合气体产生的爆炸性能量驱动活动活塞运动。活塞使它们所连接的曲轴转动。曲轴的转动力量使汽车的车轮转动。一些汽车是由另外一种发动机提供动力的,这种发动机被认为是旋转气门、旋转燃烧或汪克尔发动机。转子发动机也是吸入空气和燃料的混合气,混合气被压缩和燃烧•在一个椭圆形的室内旋转的发动机连接着一个轴,这个轴将最终驱动后面的车轮。大部分汽车中,发动机是架在汽车的前面末端的,离台器和变速箱在它后面,发动帆、离台器和变速箱被装配成一个整体。发动机工作时有很多系统都是必要的。润滑系统可以减少摩擦并减轻发动机磨损。冷却系统被用来保持发动机的温度在安全范围内。发动机必须有燃油系统保证适当数量的空气和燃料供给。空气和燃油混合物必须由点火系统在适当的时间在气缸内被点燃。最后,电子系统被用来控制启动发动机用的电动机和为发动机附件提供电能。润滑系统发动机有许多最终会被磨损的运动部件,因为它们是相对运动的。发动机使润滑油在这些运动的部件间循环,以避免因金属与金属之间的接触而导致磨损。被润滑过的部件能够因为摩擦减少而容易运动,因摩擦导致的能量损失是最小的。润滑油的第二个功能是作为冷却液和防止泄露。最后,气缸壁上的润滑油薄膜有助于活塞环密封并因此提高发动机的压缩性。冷却系统 由于燃料与空气在气缸内燃烧,从而使发动机部件温度升高。温度升高直接影响发动机的性能和发动机部件的寿命。冷却系统使发动机工作保持在有效的温度。不管驾驶条件如何,发动机系统被设计成既能防止过热又能防止过冷。燃料供给系统燃料供给系统的主要功能是以一定的比例和压力给化油器或喷射系统提供燃料,并在汽车遇到的所有情况下,满足发动机对负载、速度和坡度的需要。燃料系统也必须为汽车行驶几英里保留足够的燃料。点火系统点火系统的作用是在适当的时间使燃料燃烧,不管是高压电火花还是在每个发动机气缸中的自燃,以便于气体混合物的完全燃烧。提供给燃料室的燃料必须被点燃以提供能量。在一个火花点火发动机中,电火花就是用于这个目的。压缩点火发动机不需要一个独立的点火系统,因为点火会受混合气压缩压力的影响。电气系统发动机的电气系统提供能量给起动电动机并给所有附件提供电能。电气系统的主要构件是蓄电池、交流发电机、起动电动机、点火线圈和加热器。车架车架为汽车发动机和车身提供了一个安装框架。车架用方刚或盒形钢铁制造,有足够的强度支撑车身和其他构件的重量。汽车车架通常由一些焊接或铆接在一起的零件构成,从而形成最后的形状。发动机和橡胶垫被圈定在车架上。橡胶垫可以吸收振动,也可以提供这些振动的阻尼减轻乘客由于振动产生的不适。悬架系统悬架系统的功能是吸收由于路面不平使车轮上下运动所产生的振动。弹性元件、连接装置和减振器组成了汽车的悬架系统。悬架系统有两种类型:(1)刚性悬架系统(2)独立悬架系统在刚性悬架系统中,弹簧被系在刚性横梁上,这种系统主要被用在商用车辆的前轴和所有类型车辆的车轴上。独立悬架系统没有一根坚硬的轴。每个车架可以自由做垂直运动而相对应的另一侧车轮没有任何反应。独立悬架系统主要用在小汽车上。传动系统传动系把发动机产生的能量传递给车轮。它包括离台器(汽车上用手动变速器)、传动系(一系列的齿轮,把由发动机产生的转矩增强.推动汽车)、驱动轴、差速器和后挢。离合器离合器用于手动变速的传动系统。用它暂时把发动机和车轮之间的动力传递分开。当换档或停车时,把传动系和发动机的连接断开是很必要的。变速籍变速箱的主要功能是通过发动机把各种必需的扭矩提供给车轮,这是通过改变发动机输出轴和驱动轴两者之阃的传动比来实现的。驱动轴驱动轴或叫推动轴与齿轮箱和差动器相连。驱动轴通常在末端具有万向节。差速器差速器的功能是把来自传动轴的能量分给后轿。当汽车转弯或掉沟时,它允许后轮以不同的逮度驱动。车轿车桥是指用来安装车轮的轴,通过这些车桥向车轮提供必需的驱动力。 车轮车轮支承着整辆车.并产生牵引力来驱动汽车。车轮也用于减速和停车。转向系统转向系统是用来改变汽车方向的,在任何转向机构中最主要的就是转向精确且容易控制,同时前轮在转向后又能自动回正。一个齿轮机构,通常认为是转向齿轮,在这个系统内用来增强由驾驶员提供的转向力,这个系统使得汽车转向非常容易,驾驶员不用费报大的力。不仅仅是在弯曲的公路上需要汽车转向,在交通拥挤的路上也需要巧妙地控制。转向系统使得汽车可以被控制向左或者向右转向。制动系统制动用来使车辆放慢速度或者停车。制动系统可以是机械制动或者液压制动。现在用的制动系统95%都是液压型的。所有的制动系统都包含两种元件,一种是旋转零件,另一种是固定零件,有各种各样方法使得这两个元件相接触而使车辆减速。制动系统的主要组成部分:制动踏扳、主制动缸、车轮制动、制动鼓、制动管路、制动蹄、制动装备和联动装置。随着汽车负载和车速的增大,目前制动系统的重要性也在增大,并且现在人们更喜欢助力制动。助力制动利用真空和空气压力来提供更好的制动力。
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