外文翻译=汽车转向系统=3200字符

《外文翻译=汽车转向系统=3200字符》由会员分享，可在线阅读，更多相关《外文翻译=汽车转向系统=3200字符（9页珍藏版）》请在装配图网上搜索。

1、 汽车转向系统 随着汽车电子技术的迅猛发展 ，人们对汽车转向操纵性能的要求也日益提高。 汽车转向系统已从传统机械转向、液压助力转向 (Hydraulic Power Steering ,简称 HPS) 、电控液压助力转向 ( Electric Hydraulic PowerSteering , 简称 EHPS) ， 发展到电动助力转向系统(Electric Power Steering ,简称 EPS) ， 最终还将过渡到线控转向系统 (Steer By Wire ， 简称SBW)。 机械转向系统是指以驾驶 员的体力作为转向能源 ， 其中所有传力件都是机械的 ， 汽车的转向运动是由驾驶员操纵方

2、向盘 ， 通过转向器和一系列的杆件传递到转向车轮而实现的。机械转向系由转向操纵机构、转向器和转向传动机械 3大部分组成。 通常根据机械式转向器形式可以分为 :齿轮齿条式、循环球式、蜗杆滚轮式、蜗杆指销式。应用最广的两种是齿轮齿条式和循环球式 (用于需要较大的转向力时 ) 。在循环球式转向器中 ， 输入转向圈与输出的转向摇臂摆角是成正比的 ;在齿轮齿条式转向器中 ， 输入转向圈数与输出的齿条位移是成正比的。循环球式转向器由于是滚动摩擦形式 ， 因而正传动效率很高 ， 操作方便且使用寿命长 ， 而且承载能力强 ， 故广泛应用于载货汽车上。齿轮齿条式转向器与循环球式相比 ， 最大特点是刚性大 ， 结

3、构紧凑重量轻 ， 且成本低。由于这种方式容易由车轮将反作用力传至转向盘 ， 所以具有对路面状态反应灵敏的优点 ， 但同时也容易产生打手和摆振等现象 ， 且其承载效率相对较弱 ， 故主要应用于小汽车及轻型货车上 ， 目前大部分低端轿车采用的就是齿轮齿条式机械转向系统。 随着车辆载重的增加以及人们对车辆操纵性能要求的提高 ， 简单的机械式转向系统已经无法满足需要 ， 动力转向系统应运而生 ， 它能在驾驶员转动 方向盘的同时提供助力 ，动力转向系统分为液压转向系统和电动转向系统 2 种。其中液压转向系统是目前使用最为广泛的转向系统。 液压转向系统在机械系统的基础上增加了液压系统 ， 包括液压泵、 V

4、 形带轮、油管、供油装置、助力装置和控制阀。它借助于汽车发动机的动力驱动液压泵、空气压缩机和发电机等 ， 以液力、气力或电力增大驾驶员操纵前轮转向的力量 ， 使驾驶员可以轻便灵活地操纵汽车转向 ， 减轻了劳动强度 ， 提高了行驶安全性。 液压助力转向系统从发明到现在已经有了大约半个世纪的历史 ， 可以说是一种较为完善的系统 ， 由于其 工作可靠、技术成熟至今仍被广泛应用。它由液压泵作为动力源 ，经油管道控制阀向动力液压缸供油 ， 通过活塞杆带动转向机构动作 ， 可通过改变缸径及油压的大小来改变助力的大小 ， 由此达到转向助力的作用。传统液压式动力转向系统一般按液流的形式可以分为 :常流式和常压

5、式 2 种类型 ， 也可根据控制阀形式分为转阀式和滑阀式。 随着液压动力转向系统在汽车上的日益普及 ， 人们对操作时的轻便性和路感的要求也日益提高 ， 然而液压动力转向系统却存在许多的缺点 ： 由于其本身的结构决定了其无法保证车辆在任何工况下转动转向盘时 ， 都有较理想的操 纵稳定性 ， 即无法同时保证低速时的转向轻便性和高速时的操纵稳定性 ； 汽车的转向特性受驾驶员驾驶技术的影响严重 ； 转向传动比固定 ， 使汽车转向响应特性随车速、侧向加速度等变化而变化 ，驾驶员必须提前针对汽车转向特性幅值和相位的变化进行一定的操作补偿 ， 从而控制汽车按其意愿行驶。这样增加了驾驶员的操纵负担 ， 也使汽

6、车转向行驶中存在不安全隐患 ;而此后出现了电控液压助力系统 ， 它在传统的液压动力转向系统的基础上增加速度传感器 ， 使汽车能够随着车速的变化自动调节操纵力的大小 ， 在一定程度上缓和了传统的液压转向系统存在的问题。 目前我国生产的商用车和轿车上采用的大多是电控液压助力转向系统 ， 它是比较成熟和应用广泛的转向系统。尽管电控液压助力装置从一定程度上缓解了传统的液压转向中轻便性和路感之间的矛盾 ， 然而它还是没有从根本上解决 HPS 系统存在的不足 ， 随着汽车微电子技术的发展 ， 汽车燃油节能的要求以及全球性倡导环保 ， 其在布置、安装、密封性、操纵灵敏度、能量消耗、磨损与噪声等方面的不足已越

7、来越明显 ， 转向系统向着电动助力转向系统发展。 电动助力转向系统是现在汽车转向系统的发展方向 ， 其工作原理是 :EPS 系统的ECU 对来自转 向盘转矩传感器和车速传感器的信号进行分析处理后 ， 控制电机产生适当的助力转矩 ， 协助驾驶员完成转向操作。近几年来 ， 随着电子技术的发展 ， 大幅度降低EPS的成本已成为可能 ， 日本的大发汽车公司、三菱汽车公司、本田汽车公司、美国的Delphi 汽车系统公司、 TRW公司及德国的 ZF 公司都相继研制出 EPS。 Mercedes2Benz 和Siemens Automotive 两大公司共同投资 6500万英镑用于开发 EPS ， 目标是到

8、 2002 年装车 ， 年产 300 万套 ， 成为全球 EPS 制造商。到目前为止 ， EPS 系统在轻微型轿 车、厢式车上得到广泛的应用 ， 并且每年以 300 万台的速度发展。 转向是一个专业术语 ， 适用于采集部件 ， 联系等 ， 其中允许一艘 (舰船 )或汽车 (轿车 )按照预期的方向行驶 . 一个例外的情况是铁路运输由路轨组合在一起铁路道岔提供转向功能。 许多现代轿车使用齿轮齿条式转向器 ， 在方向盘末端有转动齿轮 ;该齿轮带动齿条移动 ，它是一种线性的齿轮紧密配合 ， 从一边到一边。这种运动把转矩通过转向横拉杆和一种叫做转向节臂的短形臂传递给转向轮的主销。 以前的设计往往采用循环

9、球式转向器 ， 而这种转向器仍然应用在卡车和多用 途车辆。这是一种老式的螺母和齿扇设计，该转向管柱转动大螺丝 (蜗轮 )， 它与一个齿扇齿轮啮合 ， 当蜗轮转动时，齿扇也随之转动，一个安装在齿扇轴上且与转向联动有关的摇臂带动转向节臂 ， 从而使车轮转动 . 循环球式转向器通过安装滚珠减少螺母和螺杆之间的摩擦 ;两根导管和螺母内的螺旋管状通道组合成两条各自独立的封闭的钢球“流到”。 齿轮齿条式转向器设计具有很大程度的反馈和直接转向 路感 ;它也通常不会有任何反弹 ， 或呆滞。缺点是 ， 它是不可调的 ， 因此当它磨损唯一的解决办法更换。 循环球式转向器的优点是机 械优势 ， 因此 ， 它被使用在

10、较大较重的车辆 ， 而齿轮齿条式原本仅限于较小和较轻 ;由于几乎普遍采用动力转向系统 ， 不过 ， 这已不再是一个重要的优势 ， 导致越来越多地在新型汽车应用齿轮齿条式转向器。 循环球式转向器设计在中心也有明显的冲击 ， 或 死点 。凡一分钟交替方向盘出不来并不移动转向机构 ;这是很容易可调螺杆的端部来减少磨损 ， 但它并不能完全消除或机制开始磨损很快。 这项设计目前仍在使用中 ， 在卡车和其他大型车辆 ， 也应用于迅速转向 ， 路感与稳健性 ， 可维护性 ， 和机械的优势相比不太重要的场合。 较小程度的反馈 ， 这样的设计也有时是一 种优点 ;当前轮碰撞时，使用齿轮齿条转向的司机只有自己的大

11、拇指受伤 ， 造成方向盘揭开一边突然 (因为驾驶教练告诉学生把自己的大拇指在前面的方向盘 ， 而非放在左右的内边缘 ). 这种效果在像卡车一样的重型汽车更为明显 ;循环球式转向防止这种程度的反馈 ， 只是因为它可以在正常情况下防止可取反馈。 转向连锁连接转向器和车轮通常符合一个阿克曼转向几何的变化 ， 它交代了一个事实 :当转向是 ， 内轮转过的半径比外轮小得多，因此适合驾驶的直路 ， 是不适合曲折。 由于车辆已成为较重而改用前轮驱动 ， 为了扭转方向盘，通常的 ， 主要的是体 力。为了解决这一问题 ， 汽车业发展的动力转向系统。 有两种类型的助力转向系统 -液压和电气 /电子。 还有一种液压

12、 -电动混合系统。 液压助力转向系统 (hps)利用油压供应的一个发动机驱动泵 ， 以协助将方向盘转转动。 电动助力转向系统 (EPS)方式 ， 是较有效率的液压助力转向系统 ， 由于电动助力转向汽车只需要提供协助时 ， 方向盘被转动 ， 而液压泵必须不断运行。 在 EPS 的帮助下是很容易调节车型 ， 最高车速 ， 甚至驾驶的喜好。 另外一个好处是 ， 通过泄漏和处置动力转向液消除对环境构成危险 。 动力转向的分支是速度可 调转向而转向是大量辅助以低速行驶 ， 稍微协助高速。 汽车制造商认 位 ， 当要停车时驾驶人可能需要做出大量转向投入，但当时高速行驶时则不然。第一辆有这特点的汽车 ， 是

13、雪铁龙与其 diravi，虽然改变了现代汽车转向系统资金的投入，但它改变了定心凸轮的压力，使得方向盘尽力去回到原来的位置。现代速度可调式动力转向系统 ， 当速度增长时减少了活塞的压力 ， 给予更直接的感受， 这一特点在所有新车正逐渐成为司空见惯。 The motor turning system Along with automobile electronic technology swift and violent development, the people also day by day enhance to the motor turning handling quality req

14、uest. The motor turning system changed, the hydraulic pressure boost from the traditional machinery changes (Hydraulic Power Steering, is called HPS), the electrically controlled hydraulic pressure boost changes (Electric Hydraulic Power Steering, is called EHPS), develops the electrically operated

15、boost steering system (Electric Power Steering, is called EPS), finally also will transit to the line controls the steering system (Steer By Wire, will be called SBW). The machinery steering system is refers by pilots physical strength achievement changes the energy, in which all power transmission

16、all is mechanical, the automobile changes the movement is operates the steering wheel by the pilot, transmits through the diverter and a series of members changes the wheel to realize. The mechanical steering system by changes the control mechanism, the diverter and major part changes the gearing 3

17、to be composed. Usually may divide into according to the mechanical diverter form: The gear rack type, follows round the world -like, the worm bearing adjuster hoop type, the worm bearing adjuster refers sells the type. Is the gear rack type and follows using the broadest two kinds round the world -

18、like (uses in needing time big steering force).In follows round the world -like in the diverter, the input changes the circle and the output steering arm pivot angle is proportional; In the gear rack type diverter, the input changes the turn and the output rack displacement is proportional. Follows

19、round the world -like the diverter because is the rolling friction form, thus the transmission efficiency is very high, the ease of operation also the service life are long, moreover bearing capacity, therefore widely applies on the truck. The gear rack type diverter with follows round the world -li

20、ke compares, the most major characteristic is the rigidity is big, the structure compact weight is light, also the cost is low. Because this way passes on easily by the wheel the reacting force to the steering wheel, therefore has to the pavement behavior response keen merit, but simultaneously also

21、 easy to have phenomena and so on goon and oscillation, also its load bearing efficiency relative weak, therefore mainly applies on the compact car and the pickup truck, at present the majority of low end passenger vehicle uses is the gear rack type machinery steering system. Along with the vehicles

22、 carrying capacity increase as well as the people to the vehicles handling quality request enhancement, the simple mechanical type steering system were already unable to meet the needs, the power steering system arise at the historic moment, it could rotate the steering wheel while the pilot to prov

23、ide the boost, the power steering system divides into the hydraulic pressure steering system and the electrically operated steering system 2kinds.Hydraulic pressure steering system is at present uses the most widespread steering system. The hydraulic pressure steering system increased the hydraulic

24、system in the mechanical system foundation, including hydraulic pump, V shape band pulley, drill tubing, feed installment, boost installment and control valve. It with the aid of in the motor car engine power actuation hydraulic pump, the air compressor and the generator and so on, by the fluid stre

25、ngth, the physical strength or the electric power increases the pilot to operate the strength which the front wheel changes, enables the pilot to be possible nimbly to operate motor turning facilely, reduced the labor intensity, enhanced the travel security. The hydraulic pressure boost steering sys

26、tem from invented already had about half century history to the present, might say was one kind of more perfect system, because its work reliable, the technology mature still widely is applied until now. It takes the power supply by the hydraulic pump, after oil pipe-line control valves to power hyd

27、raulic cylinder feed, through the connecting rod impetus rotation gear movement, may changes the boost through the change cylinder bore and the flowing tubing head pressure size the size, from this achieved changes the boost the function. The traditional hydraulic pressure type power steering system

28、 may divide into generally according to the liquid flow form: Ordinary flow type and atmospheric pressure type 2 kind of types, also may divide into according to the control valve form transfers the valve type and the slide-valve type. Along with hydraulic pressure power steering system on automobil

29、e daily popularization, the people to operates when the portability and the road feeling request also day by day enhance, however the hydraulic pressure power steering system has many shortcomings actually: Because its itself structure had decided it is unable to guarantee vehicles rotates the steer

30、ing wheel when any operating mode, all has the ideal operation stability, namely is unable simultaneously to guarantee time the low speed changes the portability and the high speed time operation stability; The automobile changes the characteristic to drive the pilot technical the influence to be se

31、rious; The steering ratio is fixed, causes the motor turning response characteristic along with changes and so on vehicle speed, transverse acceleration to change, the pilot must aim at the motor turning characteristic peak-to-peak value and the phase change ahead of time carries on certain operatio

32、n compensation, thus controls the automobile according to its wish travel. Like this increased pilots operation burden, also causes in the motor turning travel not to have the security hidden danger; But hereafter appeared the electrically controlled hydraulic booster system, it increases the veloci

33、ty generator in the traditional hydraulic pressure power steering system foundation, enables the automobile along with the vehicle speed change automatic control force size, has to a certain extent relaxed the traditional hydraulic pressure steering system existence question. At present our country

34、produces on the commercial vehicle and the passenger vehicle uses mostly is the electrically controlled hydraulic pressure boost steering system, it is quite mature and the application widespread steering system. Although the electrically controlled hydraulic servo alleviated the traditional hydraul

35、ic pressure from certain degree to change between the portability and the road feeling contradiction, however it did not have fundamentally to solve the HPS system existence insufficiency, along with automobile microelectronic technology development, automobile fuel oil energy conservation request a

36、s well as global initiative environmental protection, it in aspect and so on arrangement, installment, leak-proof quality, control sensitivity, energy consumption, attrition and noise insufficiencies already more and more obvious, the steering system turned towards the electrically operated boost st

37、eering system development. The electrically operated boost steering system is the present motor turning system development direction, its principle of work is: EPS system ECU after comes from the steering wheel torque sensor and the vehicle speed sensor signal carries on analysis processing, control

38、s the electrical machinery to have the suitable boost torque, assists the pilot to complete changes the operation. In the last few years, along with the electronic technology development, reduces EPS the cost to become large scale possibly, Japan sends the car company, Mitsubishi Car company, this f

39、ield car company, USs Delphi automobile system company, TRW Corporation and Germanys ZF Corporation greatly all one after another develops EPS.Mercedes2Benz 和 Siemens Automotive Two big companies invested 65,000,000 pounds to use in developing EPS, the goal are together load a car to 2002, yearly pr

40、oduce 300 ten thousand sets, became the global EPS manufacturer. So far, the EPS system in the slight passenger vehicle, on the theater box type vehicle obtains the widespread application, and every year by 300 ten thousand speed development. Steering is the term applied to the collection of compone

41、nts, linkages, etc. which allow for a vessel (ship, boat) or vehicle (car) to follow the desired course. An exception is the case of rail transport by which rail tracks combined together with railroad switches provide the steering function. The most conventional steering arrangement is to turn the f

42、ront wheels using a handoperated steering wheel which is positioned in front of the driver, via the steering column, which may contain universal joints to allow it to deviate somewhat from a straight line. Other arrangements are sometimes found on different types of vehicles, for example, a tiller o

43、r rearwheel steering. Tracked vehicles such as tanks usually employ differential steering that is, the tracks are made to move at different speeds or even in opposite directions to bring about a change of course. Many modern cars use rack and pinion steering mechanisms, where the steering wheel turn

44、s the pinion gear; the pinion moves the rack, which is a sort of linear gear which meshes with the pinion, from side to side. This motion applies steering torque to the kingpins of the steered wheels via tie rods and a short lever arm called the steering arm. Older designs often use the recirculatin

45、g ball mechanism, which is still found on trucks and utility vehicles. This is a variation on the older worm and sector design; the steering column turns a large screw (the worm gear) which meshes with a sector of a gear, causing it to rotate about its axis as the worm gear is turned; an arm attache

46、d to the axis of the sector moves the pitman arm, which is connected to the steering linkage and thus steers the wheels. The recirculating ball version of this apparatus reduces the considerable friction by placing large ball bearings between the teeth of the worm and those of the screw; at either e

47、nd of the apparatus the balls exit from between the two pieces into a channel internal to the box which connects them with the other end of the apparatus, thus they are recirculated. The rack and pinion design has the advantages of a large degree of feedback and direct steering feel; it also does no

48、t normally have any backlash, or slack. A disadvantage is that it is not adjustable, so that when it does wear and develop lash, the only cure is replacement. The recirculating ball mechanism has the advantage of a much greater mechanical advantage, so that it was found on larger, heavier vehicles w

49、hile the rack and pinion was originally limited to smaller and lighter ones; due to the almost universal adoption of power steering, however, this is no longer an important advantage, leading to the increasing use of rack and pinion on newer cars. The recirculating ball design also has a perceptible

50、 lash, or dead spot on center, where a minute turn of the steering wheel in either direction does not move the steering apparatus; this is easily adjustable via a screw on the end of the steering box to account for wear, but it cannot be entirely eliminated or the mechanism begins to wear very rapid

51、ly. This design is still in use in trucks and other large vehicles, where rapidity of steering and direct feel are less important than robustness, maintainability, and mechanical advantage. The much smaller degree of feedback with this design can also sometimes be an advantage; drivers of vehicles w

52、ith rack and pinion steering can have their thumbs broken when a front wheel hits a bump, causing the steering wheel to kick to one side suddenly (leading to driving instructors telling students to keep their thumbs on the front of the steering wheel, rather than wrapping around the inside of the ri

53、m). This effect is even stronger with a heavy vehicle like a truck; recirculating ball steering prevents this degree of feedback, just as it prevents desirable feedback under normal circumstances. The steering linkage connecting the steering box and the wheels usually conforms to a variation of Acke

54、rmann steering geometry, to account for the fact that in a turn, the inner wheel is actually traveling a path of smaller radius than the outer wheel, so that the degree of toe suitable for driving in a straight path is not suitable for turns. As vehicles have become heavier and switched to front whe

55、el drive, the effort to turn the steering wheel manually has increased - often to the point where major physical exertion is required. To alleviate this, auto makers have developed power steering systems. There are two types of power steering systemshydraulic and electric/electronic. There is also a

56、 hydraulic-electric hybrid system possible. A hydraulic power steering (HPS) uses hydraulic pressure supplied by an engine-driven pump to assist the motion of turning the steering wheel. Electric power steering (EPS) is more efficient than the hydraulic power steering, since the electric power steer

57、ing motor only needs to provide assist when the steering wheel is turned, whereas the hydraulic pump must run constantly. In EPS the assist level is easily tunable to the vehicle type, road speed, and even driver preference. An added benefit is the elimination of environmental hazard posed by leakag

58、e and disposal of hydraulic power steering fluid. An outgrowth of power steering is speed adjustable steering, where the steering is heavily assisted at low speed and lightly assisted at high speed. The auto makers perceive that motorists might need to make large steering inputs while manoeuvering f

59、or parking, but not while traveling at high speed. The first vehicle with this feature was the Citron SM with its Diravi layout, although rather than altering the amount of assistance as in modern power steering systems, it altered the pressure on a centring cam which made the steering wheel try to spring back to the straight-ahead position. Modern speed-adjustable power steering systems reduce the pressure fed to the ram as the speed increases, giving a more direct feel. This feature is gradually becoming commonplace across all new vehicles.