沃尔沃汽车离合器课程设计Volvo automobile clutch course design.docx
- 文档编号:9370109
- 上传时间:2023-02-04
- 格式:DOCX
- 页数:14
- 大小:21.82KB
沃尔沃汽车离合器课程设计Volvo automobile clutch course design.docx
《沃尔沃汽车离合器课程设计Volvo automobile clutch course design.docx》由会员分享,可在线阅读,更多相关《沃尔沃汽车离合器课程设计Volvo automobile clutch course design.docx(14页珍藏版)》请在冰豆网上搜索。
沃尔沃汽车离合器课程设计Volvoautomobileclutchcoursedesign
沃尔沃汽车离合器课程设计(Volvoautomobileclutchcoursedesign)
1clutchoverview
Forenginespoweredbyinternalcombustionengines,theclutchexistsinthemechanicaldriveasanindependentassembly,whichisdirectlyconnectedtotheengineinthedriveline.Atpresent,frictionclutchwidelyusedinvariousautomobilesisadevicethatcantransmitpowerandcanbeseparatedbyfrictionbetweenthemainanddrivenparts.Itmainlyincludesfourparts:
thedrivingpart,thedrivenpart,thepressingmechanismandthecontrolmechanism.
Theclutchfunctionmainfunctionistocutoffandtheenginepowertransmissiononthetransmissionsystem,toensurethecarstartedtheengineandthepowertransmissionjoinssmoothly,ensureasmoothstartcar;theshiftoftheengineandtransmissionofseparation,reducetransmissiongearshiftimpact;bythelargerdynamicloadatworkwhenthemaximumtorquetransmissionsystemtolimittheburden,topreventthetransmissionpartsdamagedbyoverload;effectivelyreducevibrationandnoiseintransmissionsystem.
2,designrequirementsandtechnicalparameters
Basicrequirement:
1)underanydrivingcondition,themaximumtorqueoftheenginecanbereliablytransmitted,andthepropertorquestoragecanbecarriedout,andtheoverloadcanbeprevented.
2)engagecompletely,smoothlyandsoftly,andensurethatthereisnoshakeandshockatthebeginning.
3)whenseparating,bequickandthorough.
4)theinertiaofthedrivenpartissmall,soastoreducetheimpactbetweenthegearsinthegearshift,tofacilitateshiftingandtoreducethewearofsynchronizer.
5)sufficientheatabsorptioncapacityandgoodventilationeffectshouldbeprovidedtoensurethattheworkingtemperatureisnottoohighandtheservicelifeisprolonged.
6)easytooperateandaccuratetoreducedriverfatigue.
7)withsufficientstrengthandgooddynamicbalance,ensureitsreliableoperationandlongservicelife.
Technicalparameter:
Volvo
Vehiclequality(kg):
1335
Maximumtorque/speed(N,m/rpm):
200/3600
Finalreductionratio:
3.38
Firstgearratio:
4.350
Scrollradius:
300mm
3,structuralschemeanalysis
3.1choice:
singleclutchdrivenplate
Singleclutch:
forpassengercarsandcommercialvehicleswithamaximummassoflessthan6T,themaximumtorqueoftheengineisgenerallynotlarge.Theclutchisusuallyprovidedwithonlyonedrivendiskundertheconditionoftheallowablesizeofthelayout.
Thestructureoftheaxialsingleclutchissimple,compactsize,goodheatdissipation,convenientmaintenance,smallinertiarotationofthedrivenpart,toensurecompleteseparationinuse,canensurethesmoothcombinationwithaxialelasticdrivendisc.
3.2thechoiceofcompressionspringandlayout:
pulltypediaphragmspringclutch
Diaphragmspringisakindofdiscspringmadeofspringsteelwithspecialstructure.Itismainlycomposedofdiscspringpartandseparatingfingerpart.
The1.diaphragmspringclutchhasthefollowingadvantagesoverotherformsofclutch:
1)ithasbetternonlinearelasticcharacteristics.
2)playtheroleofpressingspringandseparatinglever.
3)whenthehighspeedrotation,thespringpressingforcereducesveryfew,theperformanceisstable.
4)contactthepressureplatewiththewholecircumference,sothatthepressuredistributionisuniform,thefrictionpieceisingoodcontact,andthewearisuniform.
5)ventilation,goodheatdissipationandlongservicelife.
6)thecenterofthediaphragmspringcoincideswiththeclutchcentralline,andthebalanceisgood.
Two
Comparedwiththepushandpulltypediaphragmspringclutchhasmanyadvantages:
theabolitionofallpartsofmiddlesupport,notonlysupportingringorasupportring,makeitsimpleandcompactstructure,fewerparts,lowerqualityetc..
3.3thesupportingformofdiaphragmspring
Figure3-1isasingleringbearingtheformofpulltypediaphragmspring,thediaphragmspringissupportedontheclutchcoverbearingringinkill.
Figure3-1
4,clutchmainparameterchoice
4.1reservefactorbeta
Thebackupfactorbetaisanimportantparameterintheclutchdesign,whichreflectsthereliabilityofthemaximumtorquetransmittedbytheclutch.Inthechoiceofbeta,shouldbeconsideredintheuseofthefrictionwearclutchcanreliablytransferthemaximumenginetorque,preventfrictiontime,preventtransmissionoverloadandconvenientoperationetc..Passengercarbetaselection:
1.20~1.75,thisdesigntakesbeta=1.2.
4.2F,thefrictioncoefficientoffrictionsurfaceZandclutchclearancet
ThefrictionfactorFofthefrictionplatedependsonthematerialusedandtheworkingtemperature,unitpressureandslipspeedofthefrictionplate.TherangeoffrictionfactorFisshowninthefollowingtable.
Table4-1rangeoffrictionfactorFoffrictionmaterial
Frictionmaterial,frictionfactor,asbestosbasedmaterial,moldedfrom0.20to0.25
Weaving0.25~0.35
Powdermetallurgymaterialcopperbase0.25~0.35
Ironbase0.35~0.50
Cermetmaterials0.70~1.50
Thedesigntakesf=0.30.
ThefrictionsurfacenumberZistwotimesthenumberofclutch,determinethesizeandstructuresizeontheclutchtransmissiontorquerequired.ThedesigntakessingleclutchZ=2.
Clutchclearancetreferstotheclutchinthenormalstate,combinedwiththereturnspringseparationsleeveispulledafterthelimitposition,inordertoensurethenormalwearoftheclutchfrictionplatecanstillbefullyintegratedwiththeclearancebetweentheseparationbearingandtheinnerendofthereleaselever.TheclearanceofTis3~4mm.ThedesignofthedeltaT=3mm.
4.3unitpressureP
TheunitpressureofPdeterminesthewearresistanceofthefrictionsurface,hasagreatinfluenceontheperformanceandservicelifeoftheclutch,theclutchshouldbeconsideredwhenselectingtheworkingconditions,theenginepowerreservesize,frictionplatesize,materialandqualityandreservecoefficientetc.TherangeofPisshownintable4-2.
Table4-2rangeofunitpressurePoffrictionplate
Frictionsheetmaterial,unitpressureP/Mpa,asbestosbasedmaterial,moldedfrom0.15to0.25
Weaving0.25~0.35
Powdermetallurgymaterialcopperbase0.35~0.50
Iron
Cermetmaterials0.70~1.50
P:
0.10MPa1.50=P0=MPa,thedesignofP=0.3MPa.
4.4frictionplateouterdiameterD,diameterDandthicknessB
Theouterdiameterofthefrictionplateisanimportantparameteroftheclutch,whichhasadecisiveinfluenceonthecontoursize,thequalityandtheservicelifeoftheclutch.
D==188=mm(2-1)
TakeD=200mm
WhentheouterdiameterofthefrictionplateisdeterminedbyD,theinnerdiameterofthefrictionplateDcanbedeterminedaccordingtod/Dbetween0.53and0.70.
TakeC=d/D=0.62,d=0.6D=0.62200=124mm,taked=140mm
ThethicknessoffrictionplateBmainlyhas3.2mm,3.5mmand4mmthreekinds.TakeB=3.5mm.
T=betaT=1.2200=240N.m
5、designandcalculationofclutch
5.1optimizationofclutchbasicparameters
Designclutchtodeterminetheclutchperformanceparametersandsizeparameters,thechangesoftheseparametersdirectlyaffecttheclutchperformanceandstructuresize.Thedeterminationoftheseparametersinfrontoftheadoptionofthefirstprimary,postcheckmethod.Thefollowingoptimizationmethodsareusedtodeterminetheseparameters.
1)theouterdiameterofD(mm)shallbeselectedsothatthemaximumcircumferentialvelocityVshallnotexceed65to70m/s,thatistosay
V=10ND=360020010=37.7/s=65~70m/s(2-2)
Meettherequirements.
Intheformula,Visthemaximumcircumferentialspeed(m/s)ofthefrictionpiece,andNisthehighestspeed(r/min)oftheengine.
2)theinternalandexternaldiameterratiooffrictionplateshouldbeintherangeof0.53to0.70,andC=0.62isadoptedinthisdesignC.
3)inordertoensurethattheclutchcanreliablytransmitthetorqueoftheengineandpreventthetransmissionfromoverloading,thebetavalueofdifferenttypesofvehiclesshouldbewithinacertainrange,themaximumrangeis1.2to4,andthedesigntakes"beta=1.20".
4)inordertoguaranteetheinstallationofthetorsionalvibrationabsorber,theinnerdiameterDofthefrictionpiecemustbegreaterthanthespringpositionoftheshockabsorber.Thediameterof2Risabout50mm,thatis,d>2R=50mm
5)inordertoreducethethermalloadduringtheclutchslidingandpreventthefrictionplatefromdamage,fordifferenttypesofvehicles,theunitpressurePisselectedaccordingtothefrictionmaterialusedinacertainrange,andthemaximumrangeofPis0.10to1.50Mpa.
Thedesigntakesp=0.3MPa.
6)inordertoreducethefrictionoftheclutchintheprocessofstartingandpreventtheburnofthefrictionsurface,theunitfrictionareaofeachclutchshouldbelessthanitsallowablevalue[w]W.
Whenthecarstarts,thetotalslip(J)generatedbytheclutchonceis:
W=()=()=12177.5(J)(2-4)
Intheformula,Misthetotalmassofvehicle(kg);RRisthetirerollingradius(m);Icarstartedthetransmissiongearratio;Ireducerratio;nenginespeed(r/min);passengercarn2000r/min.
W===0.38=[w]=0.4,J/mm(2-5)
Meettherequirements
Elasticcharacteristiccurvesof5.2diaphragmsprings
Selectionofbasicparametersof5.3diaphragmsprings
1)thechoiceofratiosH/handH
Inordertoensurethattheclutchpressureislittlechangedandtheoperationislight,theH/hofthediaphragmspringusedintheautomobileclutchisgenerally1.5to2,andthethicknessoftheplateish2~4mm.
TakeH=2,mm,H/h,=1.7,H=1.7h,=3.4,mm.
2)theratioofR/randthechoiceofRandR
R
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 沃尔沃汽车离合器课程设计Volvo automobile clutch course design 沃尔沃 汽车 离合器 课程设计 Volvo
![提示](https://static.bdocx.com/images/bang_tan.gif)
链接地址:https://www.bdocx.com/doc/9370109.html