汽车专业英语 黄星 刘春波 黄汽驰 8

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1、Unit8AutomotiveSteeringSystemPart ITechnicalandPracticalReadingPassageATypesofSteeringSystemThesteeringsystemisamajorpartofthecar.Agoodsteeringsystemmakesdrivingmuchmorepleasurable,comfortableandsafer.Thesteeringsystem,includingsteeringwheel,steeringgears,linkagesandothercomponents,isusedtocont

2、rolthedirectionofacar’smotion.Today,therearetwobasictypesofsteeringsystems:(1)recirculatingballsteeringand(2)rackandpinionsteering.Therecirculatingballsteeringcanbeeitherpower-assistedornon-power.Rackandpinionisalmostalwayspower-assisted.Seefigure8-1.Figure8-1RecirulatingBallSteeringRecirculati

3、ngballsteeringisusedonmanytrucksandSUVstoday.Thelargerandheaviertheautomobileis,themoredifficultitistosteer.Mostlargeautomobilesareequippedwitharecirculatingballsteeringgear.Thistypeofsteeringgearisverylowinfrictionandprovidesagoodmechanicaladvantageforaheavyvehicle.Therecirculatingballsteering

4、usesaseriesoflinksandarmstoensurebothwheelsturninginthesamedirectionatthesametime.Seefigure8-2.Figure8-2Therecirculatingballsteeringsystemconsistsofsteeringwheel,steeringshaft(column),wormgearandsectorgearinasteeringgearbox,pitmanarm,trackrod,tierodandsteeringarm.Seefigure8-3.Figure8-3Thesteeri

5、ngwheelisconnectedtothesteeringboxthroughthesteeringshaft.Ontheendofthesteeringshaftisawormgearinthesteeringbox.Andaballnutridesonthewormgearandalsoengageswiththesectorgearonthepitmanshaft.Apitmanshaftismountedintheboxinaposition90ºtothewormgear.Seefigure8-4.Figure8-4Thepitmanarmisconnectedtoon

6、eendofthetrackrod.Intheotherendofthetrackrodisanidlerarm.Betweentheidlerandpitmanarms,thetrackrodissupportedintheproperpositiontokeeptheleftandrightwheelsworkingtogether.Theinnertierodendsareattachedtoeitherendofthetrackrodandprovidepivotpointsforthesteeringgear.Fromtheretheygototheoutertierode

7、ndsthroughanadjustmentsleeve.Thissleevejoinstheinnerandoutertierodendstogetherandallowsforadjustmentwhenthefrontwheelsarealigned.Theoutertierodendsareconnectedtothesteeringknucklearmsthatactuallyturnthefrontwheels.Seefigure8-5.Rac