《外文翻譯汽車(chē)轉(zhuǎn)向系統(tǒng)》由會(huì)員分享，可在線(xiàn)閱讀，更多相關(guān)《外文翻譯汽車(chē)轉(zhuǎn)向系統(tǒng)（12頁(yè)珍藏版）》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。

1、附錄A譯文 　隨著汽車(chē)電子技術(shù)的迅猛發(fā)展,人們對(duì)汽車(chē)轉(zhuǎn)向操縱性能的要求也日益提高。汽車(chē)轉(zhuǎn)向系統(tǒng)已從傳統(tǒng)機(jī)械轉(zhuǎn)向、液壓助力轉(zhuǎn)向(Hydraulic Power Steering ,簡(jiǎn)稱(chēng)HPS) 、電控液壓助力轉(zhuǎn)向( Elect ric Hydraulic PowerSteering , 簡(jiǎn)稱(chēng)EHPS) , 發(fā)展到電動(dòng)助力轉(zhuǎn)向系統(tǒng)(Elect ric Power Steering ,簡(jiǎn)稱(chēng)EPS) ,最終還將過(guò)渡到線(xiàn)控轉(zhuǎn)向系統(tǒng)(Steer By Wire ,簡(jiǎn)稱(chēng)SBW)。 機(jī)械轉(zhuǎn)向系統(tǒng)是指以駕駛員的體力作為轉(zhuǎn)向能源,其中所有傳力件都是機(jī)械的,汽車(chē)的轉(zhuǎn)向運(yùn)動(dòng)是由駕駛員操縱方向盤(pán),通過(guò)轉(zhuǎn)向器和一系列

2、的桿件傳遞到轉(zhuǎn)向車(chē)輪而實(shí)現(xiàn)的。機(jī)械轉(zhuǎn)向系由轉(zhuǎn)向操縱機(jī)構(gòu)、轉(zhuǎn)向器和轉(zhuǎn)向傳動(dòng)機(jī)械3大部分組成。 通常根據(jù)機(jī)械式轉(zhuǎn)向器形式可以分為:齒輪齒條式、循環(huán)球式、蝸桿滾輪式、蝸桿指銷(xiāo)式。應(yīng)用最廣的兩種是齒輪齒條式和循環(huán)球式(用于需要較大的轉(zhuǎn)向力時(shí)) 。在循環(huán)球式轉(zhuǎn)向器中,輸入轉(zhuǎn)向圈與輸出的轉(zhuǎn)向搖臂擺角是成正比的;在齒輪齒條式轉(zhuǎn)向器中,輸入轉(zhuǎn)向圈數(shù)與輸出的齒條位移是成正比的。循環(huán)球式轉(zhuǎn)向器由于是滾動(dòng)摩擦形式,因而正傳動(dòng)效率很高,操作方便且使用壽命長(zhǎng),而且承載能力強(qiáng),故廣泛應(yīng)用于載貨汽車(chē)上。齒輪齒條式轉(zhuǎn)向器與循環(huán)球式相比,最大特點(diǎn)是剛性大,結(jié)構(gòu)緊湊重量輕,且成本低。由于這種方式容易由車(chē)輪將反作用力傳至轉(zhuǎn)向盤(pán),

3、所以具有對(duì)路面狀態(tài)反應(yīng)靈敏的優(yōu)點(diǎn),但同時(shí)也容易產(chǎn)生打手和擺振等現(xiàn)象,且其承載效率相對(duì)較弱,故主要應(yīng)用于小汽車(chē)及輕型貨車(chē)上,目前大部分低端轎車(chē)采用的就是齒輪齒條式機(jī)械轉(zhuǎn)向系統(tǒng)。 隨著車(chē)輛載重的增加以及人們對(duì)車(chē)輛操縱性能要求的提高,簡(jiǎn)單的機(jī)械式轉(zhuǎn)向系統(tǒng)已經(jīng)無(wú)法滿(mǎn)足需要,動(dòng)力轉(zhuǎn)向系統(tǒng)應(yīng)運(yùn)而生,它能在駕駛員轉(zhuǎn)動(dòng)方向盤(pán)的同時(shí)提供助力,動(dòng)力轉(zhuǎn)向系統(tǒng)分為液壓轉(zhuǎn)向系統(tǒng)和電動(dòng)轉(zhuǎn)向系統(tǒng)2 種。其中液壓轉(zhuǎn)向系統(tǒng)是目前使用最為廣泛的轉(zhuǎn)向系統(tǒng)。 液壓轉(zhuǎn)向系統(tǒng)在機(jī)械系統(tǒng)的基礎(chǔ)上增加了液壓系統(tǒng),包括液壓泵、V 形帶輪、油管、供油裝置、助力裝置和控制閥。它借助于汽車(chē)發(fā)動(dòng)機(jī)的動(dòng)力驅(qū)動(dòng)液壓泵、空氣壓縮機(jī)和發(fā)電機(jī)等,以液力、氣

4、力或電力增大駕駛員操縱前輪轉(zhuǎn)向的力量,使駕駛員可以輕便靈活地操縱汽車(chē)轉(zhuǎn)向,減輕了勞動(dòng)強(qiáng)度,提高了行駛安全性。 液壓助力轉(zhuǎn)向系統(tǒng)從發(fā)明到現(xiàn)在已經(jīng)有了大約半個(gè)世紀(jì)的歷史,可以說(shuō)是一種較為完善的系統(tǒng),由于其工作可靠、技術(shù)成熟至今仍被廣泛應(yīng)用。它由液壓泵作為動(dòng)力源,經(jīng)油管道控制閥向動(dòng)力液壓缸供油,通過(guò)活塞桿帶動(dòng)轉(zhuǎn)向機(jī)構(gòu)動(dòng)作,可通過(guò)改變缸徑及油壓的大小來(lái)改變助力的大小,由此達(dá)到轉(zhuǎn)向助力的作用。傳統(tǒng)液壓式動(dòng)力轉(zhuǎn)向系統(tǒng)一般按液流的形式可以分為:常流式和常壓式2 種類(lèi)型,也可根據(jù)控制閥形式分為轉(zhuǎn)閥式和滑閥式。 隨著液壓動(dòng)力轉(zhuǎn)向系統(tǒng)在汽車(chē)上的日益普及,人們對(duì)操作時(shí)的輕便性和路感的要求也日益提高,然而液壓動(dòng)力

5、轉(zhuǎn)向系統(tǒng)卻存在許多的缺點(diǎn): ①由于其本身的結(jié)構(gòu)決定了其無(wú)法保證車(chē)輛在任何工況下轉(zhuǎn)動(dòng)轉(zhuǎn)向盤(pán)時(shí),都有較理想的操縱穩(wěn)定性,即無(wú)法同時(shí)保證低速時(shí)的轉(zhuǎn)向輕便性和高速時(shí)的操縱穩(wěn)定性; ②汽車(chē)的轉(zhuǎn)向特性受駕駛員駕駛技術(shù)的影響嚴(yán)重; ③轉(zhuǎn)向傳動(dòng)比固定,使汽車(chē)轉(zhuǎn)向響應(yīng)特性隨車(chē)速、側(cè)向加速度等變化而變化,駕駛員必須提前針對(duì)汽車(chē)轉(zhuǎn)向特性幅值和相位的變化進(jìn)行一定的操作補(bǔ)償,從而控制汽車(chē)按其意愿行駛。這樣增加了駕駛員的操縱負(fù)擔(dān),也使汽車(chē)轉(zhuǎn)向行駛中存在不安全隱患;而此后出現(xiàn)了電控液壓助力系統(tǒng),它在傳統(tǒng)的液壓動(dòng)力轉(zhuǎn)向系統(tǒng)的基礎(chǔ)上增加速度傳感器,使汽車(chē)能夠隨著車(chē)速的變化自動(dòng)調(diào)節(jié)操縱力的大小,在一定程度上緩和了傳統(tǒng)的液壓轉(zhuǎn)向系

6、統(tǒng)存在的問(wèn)題。 目前我國(guó)生產(chǎn)的商用車(chē)和轎車(chē)上采用的大多是電控液壓助力轉(zhuǎn)向系統(tǒng),它是比較成熟和應(yīng)用廣泛的轉(zhuǎn)向系統(tǒng)。盡管電控液壓助力裝置從一定程度上緩解了傳統(tǒng)的液壓轉(zhuǎn)向中輕便性和路感之間的矛盾,然而它還是沒(méi)有從根本上解決HPS 系統(tǒng)存在的不足,隨著汽車(chē)微電子技術(shù)的發(fā)展,汽車(chē)燃油節(jié)能的要求以及全球性倡導(dǎo)環(huán)保,其在布置、安裝、密封性、操縱靈敏度、能量消耗、磨損與噪聲等方面的不足已越來(lái)越明顯,轉(zhuǎn)向系統(tǒng)向著電動(dòng)助力轉(zhuǎn)向系統(tǒng)發(fā)展。 電動(dòng)助力轉(zhuǎn)向系統(tǒng)是現(xiàn)在汽車(chē)轉(zhuǎn)向系統(tǒng)的發(fā)展方向,其工作原理是:EPS 系統(tǒng)的ECU 對(duì)來(lái)自轉(zhuǎn)向盤(pán)轉(zhuǎn)矩傳感器和車(chē)速傳感器的信號(hào)進(jìn)行分析處理后,控制電機(jī)產(chǎn)生適當(dāng)?shù)闹D(zhuǎn)矩,協(xié)助駕駛

7、員完成轉(zhuǎn)向操作。近幾年來(lái),隨著電子技術(shù)的發(fā)展,大幅度降低EPS的成本已成為可能,日本的大發(fā)汽車(chē)公司、三菱汽車(chē)公司、本田汽車(chē)公司、美國(guó)的Delphi 汽車(chē)系統(tǒng)公司、TRW公司及德國(guó)的ZF 公司都相繼研制出EPS。Mercedes2Benz 和Siemens Automotive 兩大公司共同投資6500萬(wàn)英鎊用于開(kāi)發(fā)EPS ,目標(biāo)是到2002 年裝車(chē),年產(chǎn)300 萬(wàn)套,成為全球EPS 制造商。到目前為止,EPS 系統(tǒng)在輕微型轎車(chē)、廂式車(chē)上得到廣泛的應(yīng)用,并且每年以300 萬(wàn)臺(tái)的速度發(fā)展。 is the term applied to the collection of components,

8、 linkages, etc. which allow for a vessel ( ship , boat ) or vehicle ( car ) to follow the desired course.轉(zhuǎn)向是一個(gè)專(zhuān)業(yè)術(shù)語(yǔ),適用于采集部件,聯(lián)系等,其中允許一艘(艦船)或汽車(chē)(轎車(chē))按照預(yù)期的方向行駛. An exception is the case of rail transport by which rail tracks combined together with railroad switches provide the steering function.一個(gè)例外的情況是鐵路

9、運(yùn)輸由路軌組合在一起鐵路道岔提供轉(zhuǎn)向功能。 Many modern cars use steering mechanisms, where the steering wheel turns the pinion gear; the pinion moves the rack, which is a sort of linear gear which meshes with the pinion, from side to side.許多現(xiàn)代轎車(chē)使用齒輪齒條式轉(zhuǎn)向器,在方向盤(pán)末端有轉(zhuǎn)動(dòng)齒輪;該齒輪帶動(dòng)齒條移動(dòng),它是一種線(xiàn)性的齒輪緊密配合,從一邊到一邊。這種運(yùn)動(dòng)把轉(zhuǎn)矩通過(guò)轉(zhuǎn)向橫拉桿和一種叫做轉(zhuǎn)

10、向節(jié)臂的短形臂傳遞給轉(zhuǎn)向輪的主銷(xiāo)。 mechanism, which is still found on trucks and utility vehicles.以前的設(shè)計(jì)往往采用循環(huán)球式轉(zhuǎn)向器,而這種轉(zhuǎn)向器仍然應(yīng)用在卡車(chē)和多用途車(chē)輛。This is a variation on the older and thus steers the wheels.這是一種老式的螺母和齒扇設(shè)計(jì)，該轉(zhuǎn)向管柱轉(zhuǎn)動(dòng)大螺絲("蝸輪"),它與一個(gè)齒扇齒輪嚙合,當(dāng)蝸輪轉(zhuǎn)動(dòng)時(shí)，齒扇也隨之轉(zhuǎn)動(dòng)，一個(gè)安裝在齒扇軸上且與轉(zhuǎn)向聯(lián)動(dòng)有關(guān)的搖臂帶動(dòng)轉(zhuǎn)向節(jié)臂 ,從而使車(chē)輪轉(zhuǎn)動(dòng). The recirculating ball ve

11、rsion 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 end 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 ap

12、paratus, thus they are "recirculated".循環(huán)球式轉(zhuǎn)向器通過(guò)安裝滾珠減少螺母和螺桿之間的摩擦;兩根導(dǎo)管和螺母內(nèi)的螺旋管狀通道組合成兩條各自獨(dú)立的封閉的鋼球“流到”。 The rack and pinion design has the advantages of a large degree of feedback and direct steering "feel"; it also does not normally have any , or slack.齒輪齒條式轉(zhuǎn)向器設(shè)計(jì)具有很大程度的反饋和直接轉(zhuǎn)向"路感";它也通常不會(huì)有任何反彈,或呆滯。A d

13、isadvantage is that it is not adjustable, so that when it does wear and develop lash, the only cure is replacement.缺點(diǎn)是,它是不可調(diào)的,因此當(dāng)它磨損唯一的解決辦法更換。 The recirculating ball mechanism has the advantage of a much greater , however, this is no longer an important advantage, leading to the increasing use of

14、rack and pinion on newer cars.循環(huán)球式轉(zhuǎn)向器的優(yōu)點(diǎn)是機(jī)械優(yōu)勢(shì),因此,它被使用在較大較重的車(chē)輛,而齒輪齒條式原本僅限于較小和較輕;由于幾乎普遍采用動(dòng)力轉(zhuǎn)向系統(tǒng),不過(guò),這已不再是一個(gè)重要的優(yōu)勢(shì),導(dǎo)致越來(lái)越多地在新型汽車(chē)應(yīng)用齒輪齒條式轉(zhuǎn)向器。 to account for wear, but it cannot be entirely eliminated or the mechanism begins to wear very rapidly.循環(huán)球式轉(zhuǎn)向器設(shè)計(jì)在中心也有明顯的沖擊,或"死點(diǎn)"。凡一分鐘交替方向盤(pán)出不來(lái)并不移動(dòng)轉(zhuǎn)向機(jī)構(gòu);這是很容易可調(diào)螺桿的端部來(lái)減少

15、磨損,但它并不能完全消除或機(jī)制開(kāi)始磨損很快。 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.這項(xiàng)設(shè)計(jì)目前仍在使用中,在卡車(chē)和其他大型車(chē)輛,也應(yīng)用于迅速轉(zhuǎn)向,路感與穩(wěn)健性,可維護(hù)性,和機(jī)械的優(yōu)勢(shì)相比不太重要的場(chǎng)合。 The much smaller degree of feed

16、back with this design can also sometimes be an advantage; drivers of vehicles with 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 th

17、e front of the steering wheel, rather than wrapping around the inside of the rim).較小程度的反饋,這樣的設(shè)計(jì)也有時(shí)是一種優(yōu)點(diǎn);當(dāng)前輪碰撞時(shí)，使用齒輪齒條轉(zhuǎn)向的司機(jī)只有自己的大拇指受傷,造成方向盤(pán)揭開(kāi)一邊突然(因?yàn)轳{駛教練告訴學(xué)生把自己的大拇指在前面的方向盤(pán),而非放在左右的內(nèi)邊緣). This effect is even stronger with a heavy vehicle like a truck; recirculating ball steering prevents this degree of f

18、eedback, just as it prevents desirable feedback under normal circumstances.這種效果在像卡車(chē)一樣的重型汽車(chē)更為明顯;循環(huán)球式轉(zhuǎn)向防止這種程度的反饋,只是因?yàn)樗梢栽谡Ｇ闆r下防止可取反饋。 轉(zhuǎn)向連鎖連接轉(zhuǎn)向器和車(chē)輪通常符合一個(gè)阿克曼轉(zhuǎn)向幾何的變化,它交代了一個(gè)事實(shí):當(dāng)轉(zhuǎn)向是,內(nèi)輪轉(zhuǎn)過(guò)的半徑比外輪小得多，因此適合駕駛的直路,是不適合曲折。 As vehicles have become heavier and switched to front wheel drive , the effort to turn the

19、 steering wheel manually has increased - often to the point where major physical exertion is required.由于車(chē)輛已成為較重而改用前輪驅(qū)動(dòng),為了扭轉(zhuǎn)方向盤(pán)，通常的,主要的是體力。為了解決這一問(wèn)題,汽車(chē)業(yè)發(fā)展的動(dòng)力轉(zhuǎn)向系統(tǒng)。 There are two types of power steering systems—hydraulic and electric/electronic.有兩種類(lèi)型的助力轉(zhuǎn)向系統(tǒng)-液壓和電氣/電子。 There is also a hydraulic-electric h

20、ybrid system possible.還有一種液壓-電動(dòng)混合系統(tǒng)。 A hydraulic power steering (HPS) uses hydraulic pressure supplied by an engine-driven pump to assist the motion of turning the steering wheel.液壓助力轉(zhuǎn)向系統(tǒng)(hps)利用油壓供應(yīng)的一個(gè)發(fā)動(dòng)機(jī)驅(qū)動(dòng)泵,以協(xié)助將方向盤(pán)轉(zhuǎn)轉(zhuǎn)動(dòng)。 Electric power steering (EPS) is more efficient than the hydraulic power steeri

21、ng, since the electric power steering motor only needs to provide assist when the steering wheel is turned, whereas the hydraulic pump must run constantly.電動(dòng)助力轉(zhuǎn)向系統(tǒng)(EPS)方式,是較有效率的液壓助力轉(zhuǎn)向系統(tǒng),由于電動(dòng)助力轉(zhuǎn)向汽車(chē)只需要提供協(xié)助時(shí),方向盤(pán)被轉(zhuǎn)動(dòng),而液壓泵必須不斷運(yùn)行。 In EPS the assist level is easily tunable to the vehicle type, road speed, a

22、nd even driver preference.在EPS的幫助下是很容易調(diào)節(jié)車(chē)型,最高車(chē)速,甚至駕駛的喜好。 An added benefit is the elimination of environmental hazard posed by leakage and disposal of hydraulic power steering fluid.另外一個(gè)好處是,通過(guò)泄漏和處置動(dòng)力轉(zhuǎn)向液消除對(duì)環(huán)境構(gòu)成危險(xiǎn) 。 An outgrowth of power steering is speed adjustable steering, where the steering is hea

23、vily assisted at low speed and lightly assisted at high speed.動(dòng)力轉(zhuǎn)向的分支是速度可調(diào)轉(zhuǎn)向而轉(zhuǎn)向是大量輔助以低速行駛,稍微協(xié)助高速。 The auto makers perceive that motorists might need to make large steering inputs while manoeuvering for parking, but not while traveling at high speed.汽車(chē)制造商認(rèn)為,當(dāng)要停車(chē)時(shí)駕駛?cè)丝赡苄枰龀龃罅哭D(zhuǎn)向投入，但當(dāng)時(shí)高速行駛時(shí)則不然。The first

24、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.第一輛有這特點(diǎn)的汽車(chē),是雪鐵龍與

25、其diravi，雖然改變了現(xiàn)代汽車(chē)轉(zhuǎn)向系統(tǒng)資金的投入，但它改變了定心凸輪的壓力，使得方向盤(pán)盡力去回到原來(lái)的位置。Modern speed-adjustable power steering systems reduce the pressure fed to the ram as the speed increases, giving a more direct feel.現(xiàn)代速度可調(diào)式動(dòng)力轉(zhuǎn)向系統(tǒng),當(dāng)速度增長(zhǎng)時(shí)減少了活塞的壓力 ,給予更直接的感受。This feature is gradually becoming commonplace across all new vehicles.這一

26、特點(diǎn)在所有新車(chē)正逐漸成為司空見(jiàn)慣。 四輪轉(zhuǎn)向(或全輪轉(zhuǎn)向)是一種系統(tǒng),當(dāng)高速行駛時(shí)能增加車(chē)輛穩(wěn)定型，而在低速行駛時(shí)可以減小轉(zhuǎn)彎半徑。 In most four-wheel steering systems, the rear wheels are steered by a computer and actuators.大多數(shù)的四輪轉(zhuǎn)向系統(tǒng),后輪轉(zhuǎn)向通過(guò)單片機(jī)和驅(qū)動(dòng)器實(shí)現(xiàn)。 The rear wheels generally cannot turn as far as the Alternatively, several systems, including Delphis Quadras

27、teer and the system in Hondas Prelude line, allow for the rear wheels to be steered in the opposite direction as the front wheels during low speeds.后輪一般不能反過(guò)來(lái),有幾個(gè)系統(tǒng),包括Delphi的quadrasteer，該系統(tǒng)在本田的生產(chǎn)前線(xiàn)，當(dāng)前輪低速時(shí)，允許后輪在相反方向轉(zhuǎn)向。This allows the vehicle to turn in a significantly smaller radius — sometimes critic

28、al for large trucks or vehicles with trailers.這使得車(chē)輛轉(zhuǎn)彎半徑較小,有時(shí)應(yīng)用于大型卡車(chē)車(chē)輛及掛車(chē)。 附錄B外文文獻(xiàn) Along with automobile electronic technology swift and violent development, the people also day by day enhance to the motor turning handling quality request. The motor turning system changed

29、, the hydraulic pressure boost from the traditional machinery changes (Hydraulic Power Steering, is called HPS), the electrically controlled hydraulic pressure boost changes (Elect ric Hydraulic Power Steering, is called EHPS), develops the electrically operated boost steering system (Elect ric Powe

30、r 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 all is mechanical, the automobile c

31、hanges 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 to be composed. Usually may divide

32、 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 -like (uses in needing time big ste

33、ering 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 round the world -like the diverter

34、 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 -like compares, the most major charac

35、teristic 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 easy to have phenomena and so on

36、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 carrying capacity increase as

37、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 provide the boost, the power steeri

38、ng 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 system in the mechanical syste

39、m 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 strength, the physical strength or

40、 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 system from invented already had

41、 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 hydraulic cylinder feed, through

42、 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 may divide into generally ac

43、cording 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 automobile daily popularization, the

44、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: ①Because its itself structure had decided it is unable to guarantee vehicles rotates the steering wheel when any operatin

45、g 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;②The automobile changes the characteristic to drive the pilot technical the influence to be serious; ③The steering ratio

46、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 operation compensation, thus contr

47、ols 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 velocity generator in the tradit

48、ional 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 produces on the commercia

49、l 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 hydraulic pressure from certain

50、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 as well as global initiati

51、ve 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 steering system development

52、. 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, controls the electrical machine

53、ry 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 field car company, USs De

54、lphi 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 produce 300 ten thousand se

55、ts, 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 components, linkages, etc. whic

56、h 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 front wheels using a han

57、d–operated 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 or rear–wheel steering.

58、 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 turns the pinion gear;

59、 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 recirculating ball mechanism,

60、 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 attached to the axis o

61、f 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 end of the appar

62、atus 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 not normally

63、 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 while the

64、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 lash, or

65、 "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 rapidly. Thi

66、s 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 with 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 ke