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1、MechanicalEngineeringEnglishCertification—MechanicalTermsGlossaryAAArmAsuspensionlinkagefmedintheshapeofan“A““V“foundcommonlyonthefrontsuspension.ThesidesofthetwolegsoftheAarmareconnectedtothechassisbyrubberbushingsthepe

2、akoftheAarmisattachedtothewheelassembly.Inthiswaythewheelcanfreelymoveupdown.SometimesthereisanupperAarmalowerAarmbothupperlowerAarms.TheBritishcallita“wishbone.“AcceleratFuelpedalthrottle.Afootoperatedpedalhoperatedleve

3、rconnectedbylinkageelectronicstocontrolvehiclespeed.AdaptiveAutomaticTransmissionSometransmissionscan“l(fā)earn“adapttothedriversstylealteringshiftpointsothertransmissionfunctionstoproducethemostefficientoperation.AdaptiveCr

4、uiseControlOnestepbeyondcruisecontroladaptivecruisecontrolusesaradarsensmountedinthefrontofthevehicletomaintainasafecruisingdistancebetweenyourvehiclethevehicleinfrontofyou.Mostsystemsallowyoutosettheinterval(distancebet

5、weenvehicles)willthenacceleratebrake(withinreason)tomaintainthatinterval.Inmanycasesthesystemscantakeintoaccounthillyterrainpassingsituations.Allhavetheabilitytoactlikeregularcruisecontroltheystillrequirethedrivertosteer

6、thevehiclenmally.Someautomakersrefertoitas“intelligent“cruisecontrol.AdjustableSuspensionProvidesbetterridehling.Avarietyofsystemsareusedtovaryshockabsberfirmness.Someautomaticallysenseroadconditionsadjustshockabsbersett

7、ingsaccdingly.Othersincludeaswitchonthedashboardconsolethatallowsthedrivertoadjustshockabsbersettingstoprovideasofterfirmerridesharperhling.AftermarketAllproductsservicesusedintherepairmaintenanceofvehiclesthatwasnotprod

8、ucedbytheiginalvehiclemanufacturer.AlternatAcomponentoftheelectricalsystemitconverts12voltDC(DirectCurrent)fromthebatteryintoAC(AlternatingCurrent)attherateof13.8to14.2volts.Thealternatalsoprovidedelectricpowertooperatet

9、heengineaccessiesAirBagTheairbagalsoknownasaSupplementalInflatableRestraintSystemisapassivesafetydevicesupplementaltosafetybeltsthatinflatestoprovideacushiontoabsbimpactfcesduringmoderatetoseverefrontalcollisions.Thissys

10、temcanhelptolessenthechanceofcontactwiththesteeringwheelinstrumentpanelwindshield.Theairbagisactuatedautomaticallybysensslocatedinthefrontofthevehicle.Tomaximizeeffectivenessseatshoulderbeltsmustalwaysbeusedinconjunction

11、withthissystemAirFilterAparticulateairfilterisadevicecomposedoffibrousmaterialswhichremovessolidparticulatessuchasdustpollenmoldbacteriafromtheair.AirGapSpacebetweenthesparkplugelectrodesalsoknownasgapoftenadjustedtogain

12、maximumperfmance.AirfoilAnaerodynamicdevicedesignedtoimprovetractionbyincreasingthedownfceonthevehicle.Theuseofairfoils(alsocalledwings)increasesthecneringcapabilityimprovesstabilityatspeedbutoftenattheexpenseofadditiona

13、laerodynamicdrag.AirInjectionAsystemthatinjectsairintotheexhaustptsoftheenginefcombustionofunburnedhydrocarbonsintheexhaustgasesthusproducing“cleaner“exhaustemissions.AirSuspensionInsteadofsteelcoilleafspringssomevehicle

14、shaveabellowslikeunitateachcnerthatcontainspressurizedair.Asaruleairsuspensionscanproduceasofterride.AlignmentAnglesofthetiresuspensionaxisrelativetoeachothertheground:cambercastertoe.Alsotheadjustmentofcomponentstobring

15、themintoapredeterminedpositionfthemostefficientoperationofwheelvehiclefpropereventirewear.AlphaNumericAloadbasedtiresizingsystemcontainingtheloadcapacitytypeoftireconstructionaspectratiotherimdiameterininches.AntiLockBra

16、kes(ABS)Helpsmaintaincontrolinemergencystops.Particularlyusefulonslickpavement.Whilethedriverappliessteadypressuretothebrakepedalthesystemautomatically“pumps“BiodieselReferstoavegetableoilanimalfatbaseddieselfuelconsisti

17、ngoflongchainalkyl(methylpropylethyl)esters.Biodieselistypicallymadebychemicallyreactinglipids(e.g.vegetableoilanimalfat(tallow))withanalcohol.Biodieselismeanttobeusedinstarddieselenginesisthusdistinctfromthevegetablewas

18、teoilsusedtofuelconverteddieselengines.Biodieselcanbeusedaloneblendedwithpetrodiesel.BlemishTireAtirewithacosmeticminunifmityimperfectionbutwhosesafetyperfmanceareunaffected.BluetoothCapabilityTheabilityofaradiosystemtow

19、kwithBluetoothwirelessconnectivitytofunctioninconcertwithacellularphone.BeThediameterofanenginecylinderbearing.BrakeAssistDesignedtoshtenstoppingdistanceina“panic“stop.Appliesfullbrakingpowerevenifthebrakepedalisnotfully

20、depressed.Senssgaugethespeedatwhichthedriverinitiallydepressesthebrakepedaldeterminewhetherfullemergencystoppingpoweriswarranted.BrakeDrumAdrumbrakeisabrakeinwhichthefrictioniscausedbyasetofshoespadsthatpressagainstarota

21、tingdrumshapedpartcalledabrakedrum.BrakeFadeAconditionbroughtaboutbyrepeatedbrakeapplicationsresultinginbuildupofheatthatcausesatemparyreductionfadingofbrakingeffectiveness.BrakeHsepower(BHP)Theactualhsepowerofanengineme

22、asuredbyabrakeattachedtothedrivingshaftrecdedbyadynamometer.BrakeLiningsThereplaceablefrictionmaterialwhichcontactsthebrakedruminadrumbrakesystemtoslowstopthevehicle.BrakeMasterCylinderAcylindercontainingamovablepistonac

23、tivatedbypressureonthebrakepedal.Thepistonproduceshydraulicpressurethatpushesfluidthroughthelineswheelcylinders.Thisfcesthebrakeliningpadagainstthedrumdisctoslowstopthevehicle.BrakePadsInadiscsystemtheyarethereplaceablef

24、latsegmentsconsistingofarigidbackingplateplusfrictionalliningthattakestheplaceoftheshoelininginadrumbrake.BrakeShoeThearcshapedcarriertowhichthebrakeliningsaremountedinadrumbrake.Theyalsofcetheliningagainsttherotatingdru

25、mduringbraking.BrakesDiscAtypeofbrakingsysteminwhichbrakeshoesinaviselikecalipergriparevolvingdiskmountedonawheeltoslowstopdiscwheelrotationfbraking.BrakesDrumAtypeofbrakingsystemthatutilizesametaldrummountedonawheeltofm

26、theoutershellofabrake.Thebrakeshoespressagainstthedrumtoslowstopdrumwheelrotationfbraking.BPillarTheroofsupptbetweenavehiclesfrontdowindowrearsidewindowifthereisone.BoltCircleOftenreferredtoasthewheelboltpatternthediamet

27、erofanimaginarycircledrawnthroughthecenterofeachlughole.BrakingTqueTqueappliedbyabraketoatirewheelassemblywhichslowsstopsthevehicle.BreakawayThepointatwhichtirecneringtractionislost.BumpsteerAsteeringeffectresultingfromt

28、oecamberchangesasthesuspensionmovesupdown.CCaliperInadiskbrakeahousingfcylinderpistonsbrakeshoesconnectedtothehydraulicsystem.Thecaliperholdsthebrakeshoessotheystraddlethebrakedisc.CamberAngleTheinwardoutwardanglewhichaf

29、rontwheelspindlemakeswithaverticallineasviewedbyeitherthefronttherearofthevehicle.Positivecamberresultswhenthetopofthetiretiltsoutfurtherthanitsbottom.Theadjustmentofthissettingaffectsbothtirewearvehiclehling.CamshaftThe

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