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ID:48242556
大小:461.50 KB
页数:30页
时间:2020-01-18
《汽车系统构造(英文版)-Lesson 14 Suspension System.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Lesson14SuspensionSystemSuspensionisthetermgiventothesystemofsprings,shockabsorbersandlinkagesthatconnectsavehicletoitswheels.Suspensionsystemsserveadualpurpose–contributingtothecar'sroadholding/handlingandbrakingforgoodactivesafetyanddrivingpleasure,andkeepingvehicleoccupantscomforta
2、bleandreasonablywellisolatedfromroadnoise,bumps,andvibrations,etc.Thesegoalsaregenerallyatodds,sothetuningofsuspensionsinvolvesfindingtherightcompromise.Itisimportantforthesuspensiontokeeptheroadwheelincontactwiththeroadsurfaceasmuchaspossible,becausealltheforcesactingonthevehicledoso
3、throughthecontactpatchesofthetyres.Thesuspensionalsoprotectsthevehicleitselfandanycargoorluggagefromdamageandwear.Thedesignoffrontandrearsuspensionofacarmaybedifferent.Inatypicalsuspensionsystemforavehiclewithfront-engineandfront-wheeldrive(seeillustration),theweightofthevehicleapplie
4、saninitialcompressiontothecoilsprings.Whenthetiresandwheelsencounterirregularitiesintheroad,thespringsfurthercompressorexpandtoabsorbmostoftheshock.Thesuspensionattherearwheelsisusuallysimplerthanforthefrontwheels,whichrequiremultiple-pointattachmentssothewheelscanmoveupanddownwhilesw
5、ingingfromsidetosideforsteering.Front-wheel-drivecarwithMacPherson-strutfrontsuspensionandstrut-typeindependentrearsuspension.(SaturnCorp.)Atelescopinghydraulicdamper,knownasashockabsorber,ismountedseparatelyorinthestrutateachwheeltorestrainspringmovementandpreventprolongedspringoscil
6、lations.Theshockabsorbercontainsapistonthatmovesinacylinderasthewheelmovesupanddownwithrespecttothevehiclebodyorframe.Asthepistonmoves,itforcesafluidthroughanorifice,imposingarestraintonthespring.Spring-loadedvalvesopentopermitquickerflowofthefluidiffluidpressureriseshighenough,asitma
7、ywhenrapidwheelmovementstakeplace.Mostautomotivevehiclesusegas-filledshockabsorbersinwhichtheairspaceabovethefluidisfilledwithapressurizedgassuchasnitrogen.Thegaspressureonthefluidreducesthecreationofairbubblesandfoaming.Mostautomotivevehicleshaveindependentfrontsuspension,usuallyusin
8、gcoil
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