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1、廣東技術(shù)師范學(xué)院天河學(xué)院本科畢業(yè)設(shè)計(jì)外文翻譯譯文學(xué)生姓名陳劍鋒院（系）廣東技術(shù)師范學(xué)院天河學(xué)院專業(yè)班級(jí)機(jī)械設(shè)計(jì)制造及其自動(dòng)化指導(dǎo)教師蔣文明完成日期2011.12.30外文出處：http://en.wikipedia.org/wiki/Leaf_springLeafspringhistoryTherewereavarietyofleafsprings,usuallyemployingtheword"elliptical"."Elliptical"or"fullelliptical"leafspringsre
2、ferredtotwocirculararcslinkedattheirtips.Thiswasjoinedtotheframeatthetopcenteroftheupperarc,thebottomcenterwasjoinedtothe"live"suspensioncomponents,suchasasolidfrontaxle.Additionalsuspensioncomponents,suchastrailingarms,wouldbeneededforthisdesign,butnotfo
3、r"semi-elliptical"leafspringsasusedintheHotchkissdrive.Thatemployedthelowerarc,henceitsname."Quarter-elliptic"springsoftenhadthethickestpartofthestackofleavesstuckintotherearendofthesidepiecesofashortladderframe,withthefreeendattachedtothedifferential,asi
4、ntheAustinSevenofthe1920s.Asanexampleofnon-ellipticleafsprings,theFordModelThadmultipleleafspringsoveritsdifferentialthatwerecurvedintheshapeofayoke.Asasubstitutefordampers(shockabsorbers),somemanufacturerslaidnon-metallicsheetsinbetweenthemetalleaves,suc
5、haswood.Leafspringswereverycommononautomobiles,rightuptothe1970sinEuropeandJapanandlate70'sinAmericawhenthemovetofront-wheeldrive,andmoresophisticatedsuspensiondesignssawautomobilemanufacturersusecoilspringsinstead.Todayleafspringsarestillusedinheavycomme
6、rcialvehiclessuchasvansandtrucks,SUVs,andrailwaycarriages.Forheavyvehicles,theyhavetheadvantageofspreadingtheloadmorewidelyoverthevehicle'schassis,whereascoilspringstransferittoasinglepoint.Unlikecoilsprings,leafspringsalsolocatetherearaxle,eliminatingthe
7、needfortrailingarmsandaPanhardrod,therebysavingcostandweightinasimpleliveaxlerearsuspension.Amoremodernimplementationistheparabolicleafspring.Thisdesignischaracterisedbyfewerleaveswhosethicknessvariesfromcentretoendsfollowingaparaboliccurve.Inthisdesign,i
8、nter-leaffrictionisunwanted,andthereforethereisonlycontactbetweenthespringsattheendsandatthecentrewheretheaxleisconnected.Spacerspreventcontactatotherpoints.Asidefromaweightsaving,themainadvantageofparabolicspringsi
