白车身开发-车门铰链

车门工程开发:铰链对齐Candoorofyourcarresistverticalload?Basicstaticgeometryisasbelow.Underexternalload(F),forces(R1)and(R2)arereacted.Doorhingesettingbeginswiththisgeometrycheckup.Thesmalleristheratio(X/Y),themoreeffectiveistoreducestressandminimizedeflectionfromviewpointofforcecoupling.Buttherearealotofrestrictionsindoingengineeringfeasibilityuntildecisionofratio(X/Y).ThistopicistoexploreoptimizedratiowithcriticalquestionsIofferbelow.I'dliketorecommendyoukeeptheratiolessthan2.5Let’sseeanexampleofrealcarfeasibilitystudyingcase.1.Whatisstandardviewtomeasuredimension‘X’and‘Y’?,2.Whereispositionofpoint‘a’?3.Whereispositionofpoint‘b’?4.Whereispositionofpoint‘c’?Answerto#1issideviewbasedonvehicle’sabsolutecoordinatesystem.Answerto#2isaintersectedpointasbelowwhendoorislatchedtostriker.Answerto#3and#4isaintersectedpointbetweenplanarsurfaceofbodyplateandrotationaxis.Forupperhinge,topplanarsurfaceofbodyplateshallbeintersectedwithimplicitline(=axis)andbottomplanarsurfaceshallbeintersected.Smallerdimension“p”ismoreeffectivetoreduceswingarmofdooredgeandminimizeriskofhardcontactingwithA-pillarstructureordoorhingewhendoorisfullyopened(includingovertraveling).Meanwhile,smallerpcanalsocausetroublessuchasnarrowerclearanceofhingetooldriveraccessandrestrictionofboltcommonuse.Canyouoptimize“p”,givenallfactorsabove?I’dliketorecommendyoubeginwith50mmonthis,butthevaluecouldbevariedundersuchconditionsashingeboltlength,hingetooldriversize,hingecommon-usestrategyandtotalthicknessofpanelstack-up.Indimension“K”,doorplatefootprintreflectsamountofhingeREINF’sadjustmentinbothdirectionofcar-crossandup-down.(*partname“HingeREINF”iscalleddifferentfromeachcompany.Anchorplateisoftencalledtoo,insteadofhingeREINF.)DoorpartinggapandflushqualitycanbeadjustedphysicallybyseekingoptimizedweldpositionofhingeREINFinbody-assemblyshop.Andhinge’sclearancetoinnerpanelisalsorequired.Thosetwofactorsshallbeincorporatedinto“K”Canyouset“K”?Myrecommendationfor“K”istobeginwith4.5mmorlessinwhich2.5mmisforhingeREINFadjustmentand2mmisforhinge’sclearancetoinnerpanel.Thatmeans,holesizeoninnerpanelshouldbedecidedbyhingeboltdiameter.Forexample,ifboltdiameteris8.0mm,innerpanelholeneedstobe13mmdiameter.Butthisvaluecanbevariedundersuchconditionsashingeboltdiameterandtolerancemanagementstrategypereachcompany.DimensionJissum{n,s,innerthick,u,outerthick}insectionbelow.Whatisdimensionforn?Whatisdimensionfors?Whatisdimensionforu?Myrecommendationis2.0ormoreforn;2.0mmormorefors.Foru,I'dliketorecommendbeginingwith5.0mmbutthiscouldbevariedduetosuchconditionsashingedrivertoolclearanceandpressformabilityissueSwingarmisdefinedasedgespanwhendoormovestobeopened.Thelongerisswingarm,thebiggerisdimension‘P’.Forexample,arm2willbeadisastertobodystructureifsectionalsizeofA-pillarupperbodyshouldbereducedsignificantlytoavoidinterferencewithdooredgeandwillalsobeabigobstacletocompany’sstrategyforcommonuseofdoorhinge.Givenabove,dimension‘P’isveryimportantforcriticalperformancesinbothdynamicitemslikecrashsafetyandstaticitemslikestrength/stiffnessofentirecarstructure.Therefore,preciserequirementafterfeasibilitystudyneedstobesenttodesignstudiobeforepartinglineisset.Howtocreatethestylingrequirementwillbedealtwithinnextchapter.Asforfrontdooralignment,zerodegreefromsideview;1.5to2.0degree(Θ2)ispreferredfromrearview.Butinstrumentpanelinstallationoftenrequiresbody-openingflangeroutetobechangedinordertosecuremoreclearancetobesetintobodyinside.Inthiscase,axisangle(Θ1)isforcedtobetiltedanti-clockwisebut2degreeorlessisrecommended.Asforreardooralignment,axisangle(Θ2)isrecommended2.0to3.0degreewhileaxisangle(Θ1)isrecommended2.0to3.0degreeclockwisebutthisvaluesisvariedduetosurroundings.Rotationaxisalignmentisveryimportantcommercialfactor.Appropriateself-closingsettingispreferredbutshouldbecarefulnottobeexcessive.Self-closingisdrivenbypotentialenergyofassemblyweight.Thatmeans,potentialenergyshallbebiggerwhendooropenedthanwhenclosedasmuchasheightgains.Optimizingaxisangleissolutiontothat.Let’sseeeachcaseonthegraphbelow.Centergravityofdoorassemblyismovedupwhileopenangleisvaried.Preferredrangeofpotentialenergyisasbelow.Undesirablecaselikeyellowcurveshouldcontrolledbycheckerattheangle.Normally,itsrangeispreferredfrom45degto60degree.(*Butthatcaseisnotrecommended).Adjustmentofhingeaxismainlydependsonclearancebetweenboltandpanelhole.Dimension‘A’meansboltclearancetodoorinnerpanelholeedge.Oncehingemountbracket(oranchorplate)componentassembledwithclinchnutisinplacewelltooptimizedoorpartinggapandflushness,doorhingeboltwillberuledbythefixedbracket(oranchorplate)position.Door’sflushnessandpartinggapinup&downdirectionwillbeaffectedasmuchasdimension‘A’thatisrecommended2.0mmto2.5mmnormally.Forinformation,holeonhingedoorplateisveryrequiredtobetightenedwithbolt(A),allowingonly0.5mmorlessinclearancebetweentwoofthem.Dimension‘B’meansboltclearancetoholeedgeofhingebodyplate.Sequenceinbodyshopisasfollows:1)hingeassemblyisinstalledtodoorpanelbybolt‘A’;2)doorassemblywithdoorhingeattachedisinstalledtoupperbodybybolt‘B’;3)Fenderisinstalled.Forsequen