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1、Something about thedifferentialBy ordinarydifferentialplanetarygear,the planetroundrack (differentialshell)and halfaxle gears,etc parts.By the powerof the engine,directdriveshaftintodifferentialplanetarywheelframe,again by the planetswheeldriveleft,right,two halfshaftare respectivelydrivenwheelsleft
2、and right.Differentialdesign requirementsmeet: (left)+(rightshaftspeed shaftspeed) =2 (planetswheel frame speed). Whenthe automobilemoher, left,rightwheel and planetarywheel framethree speed equal in balance,whileinthe car when turningthreeequilibriumstateisdestroyed,cause the medial wheel speeddecr
3、eases,and the lateralwheelRPMincreases.AutomotivedifferentialisdrivenaxleLord pieces.Itsfunctionisto both sideshalfshafttransmissionpower, whileallowing both si-deshalfshaftindifferentspeed rotating,satisfybothsideswhellas pure rollingforms do isometricdriving,reducingtireand the surfacefriction.Dif
4、ferentialthisadjustment isautomatic,here involvesminimalenergy consumption principle,namely earthallobjectsare inclinedto consumption minimumstate.For example a grainofbeans intoa bowl,beans willautomaticallystaysin the bowlbottom and never stayinbowl wall,because bowl bottom islowestenergy position
5、(potential),itautomaticallyselectstatic(minimum) withoutconstantlykineticenergy movement. In the sameway, Wheel incorneringwould also automaticallytendency of thelowestenergy consumption inaccordance withstate,automaticaly turningradiuadjustingrightwheels speedWhencornering,due to thelateralfriction
6、wheel draggedphenomenon,medial wheel have slipphenomenon, two drivingwheel nowcan produce two oppositedirectionof additionalforce,as a resultofminimalenergy consumptionprinciple,which inevitablyleads名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 6 页 - - - - - -
7、 - - - on both sidesof the wheel speeddifference,thus destroyedthreebalance relationship,and throughthe halfshaftare reflectedinhalfaxlegear,forcingplanetarygear produce rotation,make thelateralhalfshaftspeed faster,medial halfaxle planetismal,thusrealizeboth sideswheel speeddifference.Ifthe drivewh
8、eels on eitherside of the driveaxle shaftto theuse of a whole rigidconnection,the two wheels can only at the sameAngle rotation.So, when thevehiclesteeringwheel drive,dueto the lateralthan medialwheelsmovedacrossthe distanceisbig,willmake the lateralwheels inrollingproduced simultaneouslyslipperypro
9、crastinate,and medialwheels inrollingproducedsimultaneouslyslip.Even the carrun straightroad gravamen,because although pavement straightbut tyresor rollingradiusrange(tyremanufactureerror,weardifferent,by the uneven orpneumatic rangingcaused by thewheels of sliding).Wheel when not onlyaggravateslidi
10、ngtirewear,increasepower and fuelconsumption,stillcan make thevehiclesteeringdifficulties,brakingperformancebecomespoor.For the wheel as faras possiblewillnot occur in the structureofsliding,must guarantee the wheelscan come withdifferentAnglerotation.Axis between differential:usuallydrivenwheel bea
11、ringsforsupporton spindle,enable to anyAngle rotation,and drivewheelsrespectivelywithtwo roothalfaxlerigidconnection,in betweentwo roothalfshaftwithdifferential.Thisdifferentialalsocalledshaftbetweendifferential.Ifafteraxlesmake itawhole,he couldntdo iton bothsides of the wheel speed difference,name
12、ly cantdo an automaticadjustment.In order to solve thisproblem,as earlyas ina hundredyears ago, France Renaultautomotivecompany founderluisRenault willdesign a differentialinthisthing.名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 6 页 - - - - - - - - - Modern v
13、ehicleson thedifferentialusuallyaccordingtoitswork characteristicsintogeartypedifferentialand slipdifferentialtwo kindsbig.1. Open-die differentialThe structureof the Cherokeeopen-diedifferentialistypicalofplanetarygear setstructure,only the sun wheel and outsidethepiniongear ringare the same. Inthi
14、splanetarygearset,drivinggear is planet shelf,passive roundistwoSUNSwheel.Throughtheplanetarygearsetthetransmissionpropertieswe know,ifthe planetshelfas ZhuDongZhou,twoSUNS wheelspeedandrotationdirection is not affirmatory,even two SUNSwheel rotation direction is the opposite.Vehiclecondition,thisdi
15、fferentialmoher, featureistotwo and a halfshafttransmissiontorqueof the same. In a drivingwheel impending case, ifthe driveshaftrotation,have adhesion isuniformthe drivingwheels ofdrivingforce,ifthere is no driveshaftrotationisaccelerated,have adhesion the drivingwheelsdrivingforceequals impendingwh
16、eel Angle accelerationandrotaryinertiaof the product.Vehicleturningtiresdontskidcondition,connect the twohalvesof the differentialshafttorque directionis opposite,givethe vehicledrivingforward,andonlythe insideof the wheel,theplanetshelfand medialsun roundby the isokinetictransmissionbetween became
17、decelerationtransmission,drivingsensationisacceleratedspeed cornersthanstraightmore powerful.The advantages of open-diedifferentialisinstalledinthepavement turned drivingon the besteffect.Weaknessisina drivingwheel lossadhesion,under thesituationof anothernor drivingforce.Open-die differentialisthes
18、uitablescope that allpaving roadtraffic,frontaxleand rearaxledriverdrivecan be installed.2. LimitedslipdifferentialLimitedslipdifferentialused forpartsmake up open-diedifferentialtransmissioninoff-roaddefects,itis in the opendifferentialinstitutionimproved,and the differentialshellside名师资料总结 - - -精品
19、资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 6 页 - - - - - - - - - increasefrictionbetween gearpiece,correspondingto theplanetarygear set speaking,is theplanetshelfand the sun roundbetween increasedfrictionslices,increasethe sun wheel and planetshelffreerotatingresistancet
20、orque.Limitedslipdifferentialprovideadditionaltorque,andfrictionslicestransferof powerand two drivingwheel rotationdifferenceof concerned.In open-diedifferentialstructureto improve on LSD, cannotproduce 100%limitedslip,becausethe limitedslipcoefficient,thehigherthe vehiclesto thecharacteristicsof th
21、e poor.LSD have open-diedifferentialtransmissioncharacteristicsand mechanicalstructure.Advantage is to providecertainlimitedsliptorque,defectisturningperformancebecomes poor,frictionsliceslimitedlife.LSD isthe suitablescope pavingroad surfaceand mildoff-road.Usuallyused forthe drive.Formerdrove gene
22、rallydoes not installed,because LSD interferesteering,limitedslipcoefficient,thegreaterthe steeringthe moredifficult.3.The locktypedifferential(mechanicallockingcheck,electricthe lock,pneumaticlockingcheck)In orderto guaranteetheoff-roadvehiclesincomplexconditions,drivingperformancethroughcertainmec
23、hanicalstructureof the differentiallockedachievetwo halfaxlesynchronous rotation.Through theanalysisof planetarygear set isthe planetarygear set of gearmechanisms locked,guaranteetheplanetshelfwheel withthe sun,and two SUNSround between thetransmissionratiobetween is 1:1.Canthe sun to the wheel and
24、planetshelfthe lock,can put the planetshelfand planetarygear locked,stillcan put two SUNSwheellocked.The locktype differential,withoutthe lock,itstransmissioncharacteristicsand open-diedifferentialexactlythe same as名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共
25、 6 页 - - - - - - - - - thatinthe lock,under thesituationof transmissionratiowas fixedfor1:1.The advantages of thisdifferentialinoff-roadself-evidentthatprovidesthebiggestdrawback isthe drivingforce,the differentiallock up thesituation,vehiclesteeringextremelydifficult,Existingsinglewheel inheritengi
26、ne 100%torquepossible,halfshaftwillbecause torqueexcessivedeformationor break,Vehiclesinthe process of steeringbearings,two and a halfby oppositetorque,ifboth sidestiresadhesion arelarge,would wringhalfaxle.Moreover,thiskindofdifferentials,the vehicleprocessexecutionlockup the actionwillproduce larg
27、ernoise.4 . ElectronicdifferentialslockElectronicdifferentialslockand the aforesaidcompared,withoutchanging the structureandcharacteristicsof open-diedifferential,but use ABSor EBDsystem to implement unilateralbrakingskidwheels movement,limitof two drivingwheel rotationdifference,guaranteethe drivew
28、heels momentum.Advantages:good safety,wontdamagedvehicle.Faults:need ABSand costly;EBDsystem, Inthe harsh off-roadconditions,electronicproductreliabilityasmechanicalproducts;Unilateralwheel drivingforce,as the locktype differential.1, gear typedifferential:Whendrivingwheel rotationdifferenceexistsab
29、out when,differentialassignedto slowturnsdrivingwheel torqueisgreaterthan turnfastdrivingwheel torque.Thiskindofdifferentialtorquepartitioningcharacteristicscan satisfythecar ingood pavement moving. Butwhenthe automobilein bad the road,but seriousinfluencethroughcapacity.E.g.when a car drivingwheel
30、intomuddy road,althoughanother drivingwheel in good road,the car was oftencannot advance(known as slips).At thispointinthe muddy road on the drivingwheels in-situslip,ingood roadwheels ismotionless.This isbecause inthe muddy road wheels名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理
31、- - - - - - - 第 5 页，共 6 页 - - - - - - - - - and road surfaceadhesion betweenthe lesser,road only through thisround of half-and-halfshaftroleof smallerreactiontorque,thereforedifferentialassigned tothisround of torquealsosmall,althoughanother drivingwheel andbetterroad to improve adhesion ofthe large
32、r,but because averagedistributioncharacteristicsoftorque,which make thisdrivewheels can onlyalsoassignedtothe drivewheels withslipequalamounts of torque,so thatthedrivingforceto overcome drivingresistance,cars cantadvance andmotivationisexpended inslipdrivingwheel.At thistimetofloornot only madethe
33、car ahead,insteadof waste fuel,accelerateparts wear, especiallytirewear isintensified.Effectivesolutionsare:slicerslipdrivingwheelunder the mudor in thiswheel matdry soil,gravel,branches,hay,etc.2, slipdifferential:In order to improve the car in a badway throughcapacity,someoff-roadvehicleand limous
34、inesscrewup slipdifferential.Slipdifferentialcharacteristicsare,whendrivingwheel in a bad waysideslip,can make the most or alltorquein good road to the drivingwheels,to takefulladvantage ofthe drivewheels adhesion togenerateenough force,thatcarstartor continueto drive.1. Differentialshelltherecannot
35、 be any propertiesof crack,shelland planetarygear gaskets,differentialhalfaxlegearcontactbetween, shouldbe smoothwithoutgroove,Ifthereisaslightgroove or wear, can continueto use aftergrinding,otherwisemust be changed or be repaired.2 the planetarygeardifferentialshelland planetarygear wheel when the fittingclearancemust not be more than0.1-0.15mm,halfaxlegear shaftneck and shellwithholesforclearancefit,shouldhave noobviousloosefeeling,otherwisedesertmust be changed or repair.名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 6 页 - - - - - - - - -