汽车离合器英语论文讲解Word文档格式.docx

汽车离合器英语论文讲解Word文档格式.docx

《汽车离合器英语论文讲解Word文档格式.docx》由会员分享，可在线阅读，更多相关《汽车离合器英语论文讲解Word文档格式.docx（12页珍藏版）》请在冰豆网上搜索。

2008级机械设计制造

及其自动化

姓名:

张春友

学号:

312008080301427

指导教师:

孙书民徐红

Thedesignofdiaphragmspring

Abstract

Theclutchistheimportantcomponentsinautomobiletransmissionsystem,themainfunctionistoachieveiscutoffandtheenginetothepowertransmission,guaranteedthattheautomobilestartssmoothly,ensuredrivesystemwhentheshiftworksmoothlyandlimitthetransmissionsystemtowithstandthemaximumtorque,preventthetransmissionsystemoverload.Diaphragmspringclutchisinrecentyearsinthevehicleandlightvehicleusedinaclutch,thetorquecapacityoflargeandrelativelystable,convenientoperation,goodbalance,canbemassproduction,andtheresearchonithasbecomemoreandmoreimportant.

Keywords:

diaphragmspringclutch;

Diaphragmspringclutchoverview

Diaphragmspringclutchisinrecentyearsinthecarandlighttruckusedaclutch.Becauseofitsasapressurespring,canalsoplaytheseparationlevereffect,wherebytheclutchinordertosimplifythestructure,qualityreduction,andremarkablyreducetheaxialsizeofclutch.Secondly,asaresultofdiaphragmspringandpressurewiththecircumferentialcontact,sothatuniformdistributionofpressure.Inadditionduetothediaphragmspringwithnonlinearelasticproperties,itcanbeinthedrivendiscfrictionplateabrasion,springcanstillreliablytransferthetorqueoftheengine,withoutcausingslipawayfrom.Clutch,theclutchpedalmanipulationoflight,reducethelaborintensityofthedriver.Inaddition,becauseofthediaphragmisasymmetricparts,goodbalance,athighspeed,thepressingforcereducingrarely,buttheweekarrangedelasticclutchathighspeed,duetothecentrifugalforcewillgeneratetransversebending,springseveredrum,therebyreducingthepressureplatepressure,therebycausingtheclutchtotransmittorquecapacity.Ascanbeseen,forlightdiaphragmspringclutchdesignresearchfortheimprovementofautomobileclutchperformanceinallaspectshasveryimportantsignificance.

Asthehold-downspringcalleddiaphragmspring,ismadeofspringsteelstamped,with"

nobottomplate"

shapeofthetruncatedconeshapedthinwalldiaphragm,andthesmallendsurfaceonapluralityofradialgroove,toformanelasticlever,whiletheremainingslotscutendtruncatedconicalpartisaspringaction.Diaphragmspringarearrangedonthebothsidesofthesupportingring,andthelatterbymeansofafixedonaclutchcoversome（radialgroovescutinhalfnumberofrivetstoinstalllocation）.Whentheclutchcoverboltfixedtotheflywheel,theflywheelclutchcovertotherearsupportring,diaphragmspringtogenerateelasticdeformation,theapexangleoftheconebecomeslarge,andevenalmostflatteneddiaphragmspring.Atthesametimethelargerendofthediaphragmspringpressureplatepressingforcegeneratedontheclutchisinthecoupling.Whentheclutchisdisengaged,theseparationbearingforwarddiaphragmspringpressurebeforethesupportingringasafulcrumofreversetaperedtransition,sothatthediaphragmspringaftertheshift,andbyseparatingthehookpullingthepressureshiftclutch.Diaphragmspringclutchhasmanyadvantages:

firstofall,asaresultofthediaphragmspringwithnonlinearcharacteristic,thereforethedesignofthefrictionplateabrasion,springpressureisnearlyconstant,andcanreducetheseparationwhentheclutchpedalforce,makethemanipulationoflight;

secondly,diaphragmspringclutchmountedpositiononthecenterlineoftheshaftaresymmetrical,sothepressingforceactuallyfromtheinfluenceofthecentrifugalforce,stableperformance,balanceor;

furthermore,diaphragmspringitselfandpressingspringandseparationoftheclutchlevereffect,simplestructure,lessnumberofparts,thequalitydecreasesobviouslyshortenstheaxialdimension;

inaddition,thediaphragmspringandthepressureplateistheentirecircumferentialcontact,sothatthepressureuniformdistribution,goodcontactfrictionfrictionplate,uniform,easytoachievegoodventilationandcooling.

Pulltypediaphragmspringclutchhastheadvantages

Comparedwithpush,pulltypediaphragmspringclutchhasmanyadvantages:

amiddlesupportingcomponents,anddonotsupportringoronlyasupportingring,thestructureissimple,compactstructure,fewerparts,qualityless;

pulltypediaphragmspringiscentralandtheplatenpressplatensizeinthesameconditionsthelargerdiameterdiaphragmspring,improvesthepressingforceandtheabilitytotransfertorque,anddoesnotincreasethepedalforce,inthetransmissionofthesametorque,canusethesmallsizestructure;

inthejointorseparatestate,theclutchcoverdeformationsmall,largestiffness,higherseparationefficiency;

pullleverageratiogreaterthanpush-downleverratio,andtheintermediatesupporttoreducethefrictionloss,hightransmissionefficiency,pedaloperatedmoreportable,pulltypepedalforcethanthepushtypegeneralreduction;

bothinthejointstateorseparatestate,pulltypediaphragmspringclutchstructurewithcoversupportkeepingincontact,onasupportingringwearcannotbeformedafterclearanceandincreasedpedalfreetravel,noimpactandcry;

alongerservicelife.

Clutchdiaphragmspringdesign

Thestructuralcharacteristicsofdiaphragmspring

Fromthefrontcanknow,thedesignofthediaphragmspringcompressionspringis.Thediaphragmspringclutchpushandpull,inthedesignofthestructure.

Diaphragmspringintheshapeofthestructureisdividedintotwoparts.Inthelargerendofthediaphragmspringisanintegrityofthefrustum,itisshapedlikeabottomlessdishesandgeneralmachinerywithdiscspringdiscspringareexactlythesame,soaspartof.Diaphragmspringonelasticeffectisthedishspringpart.Discspringelasticeffectisthat:

alongtheaxialdirectionofloading,discspringcompressionbecomesflat,afterunloadingandtherestorationoftheprototypeofthe.Canbesaidthatthediaphragmspringdiscspringisaspecialstructuralform.Thedifferenceis,thediaphragmspringisalsoarrangedontheradialslottedsection.Onthediaphragmspringradiallyslottedportionslikearingofpetals,itsroleis,whentheclutchisdisengagedasseparationlever.Soitisalsocalledtheseparationclaw.Separationclawandadiskspringcomponentjunctionradialslotwiderectangularcircularhole.Insodoing,onecanreducethestressconcentrationattherootoftheseparationclaw,ononehandandcanbeusedfortheplacementofpinsfixeddiaphragmspring,separationclawrootfillettransitionR>

4.5.

Diaphragmspringdeformationandloadingmethod

Asaresultofdiaphragmspringusedtopushtypestructure,sothedress.Intheengagementanddisengagementofclutch,diaphragmspringloadingsituationisdifferent,correspondingtotwomodesofloadinganddeformation:

（1）:

whenengagingclutchdiaphragmspringup,pressingspring,thepressureplatein--clutchcoverassemblyandflywheelassemblypreviously,diaphragmspringapproximationisinfreestate,diaphragmspringontheplatenwithoutcompressingfunction.Whentheplaten--clutchcoverassemblyandflywheelmountedtogether,thefrontendoftheflywheelclutchcovertothefrontendsurfaceclose.Therefore,theclutchcoverthroughthesupportingring4ofthediaphragmspringloaded,almostflatdiaphragmspring.Atthesametimeontheplatenalsoeffectofload.Wecallthepressingforce.Thesupportingring4andadiaphragmspringplatecontactbetweentheheightvariationcalledbigdeformationofdiaphragmspringreleasebearing,relativetotheplatenheightvariationcalledthesmallenddeformation.

（2）:

whentheseparationbearingseparationwithP2forceactingonthediaphragmspringofthesmallend,asupportingring4isinoperative,andthesupportingring5toplayarolein.WhentheP2forcereachesacertainvalue,diaphragmspringispressedover.Separationinthelargerendofthediaphragmspringandthesmallendwillfurthergenerateadditionaldeformationand.Thediaphragmspringdeformationof。

Theelasticdeformationpropertiesofdiaphragmspring

Infrontofsaiddiaphragmspringonelasticpartisthediscspringdiscspringpart,partoftheelasticdeformationandthespiralspringisnotthesame,itisanonlinearspring,itscharacteristicsandthediscspringportionsoftheoriginalinnertruncatedconehighHandspringplatethicknessratioofHH/h.DifferentH/hvaluescanbeobtainedbydifferentcharacteristicsanddeformationcharacteristicsof.Generalcanbedividedintothefollowingfourcases:

TheH/h<

Thefollowingfigure7.1H/h=0.5curve,thecurveshapeis:

loadPincreases,deformationisalwaysincreasing.Thestiffnessofthespringisverybig,canbearlargeload,andasabufferdeviceforstrokelimiter.

TheH/h=

InFigure7.1H/h=1.5≈curve,elasticcharacteristiccurveinthemiddleofaverystraight,deformationincrease,loadPalmostunchanged.Thisspringcalledzerostiffnessspring.

The<

H/h<

2

H/h=2.75inFigure7.1,thespringcharacteristiccurvehasanegativestiffnessregion,i.e.whenthedeformationincreases,theloaddecreasedwiththispropertyisverysuitableforuseasaclutchdiaphragmspringcompressionspring,becausethenegativestiffnesszonetoseparatetheclutch,thedecreaseofload,labor-savingoperationpurposeofcourse,negativegreatstiffnessisnotsuitable,lestthespringworkingpositionslightlychangescausedbythespringpressingforceistoolarge.

TheH/h>

Figure7.2below,thespringcharacteristiccurvewithagreaternegativestiffnessunstableoperatingregion,andaloadnegativearea.Thisspringf