四轮定位基础知识培训资料

1QualityToolsandServiceEquipment悬挂及四轮定位基础知识2QualityToolsandServiceEquipment为什么要做四轮定位？四轮要方向正确3QualityToolsandServiceEquipment为什么我的车四轮定位“失常了？”你问为什么四轮定位“失常”吗？？？部件磨损部件变形或损坏人为调整错误4QualityToolsandServiceEquipment做四轮定位之前的检察普通位置的检测•转向机构•悬挂固定连杆•车身高度•上下转向臂胶套•转向球头举升位置•拖车钩5QualityToolsandServiceEquipment轮胎花纹的检测花纹磨损正常中间部位花纹磨损两侧花纹磨损锯齿型磨损单边磨损6QualityToolsandServiceEquipment轮胎检测宽高AspectRatioP=小轿车(T=卡车)175=胎宽60=比(高/宽)VR=速度/子午线14=钢圈直径/英寸尺寸7QualityToolsandServiceEquipment车身高度按照原厂数据确定检测点8QualityToolsandServiceEquipmentCamber外倾角向内倾斜=负向外倾斜=正•轮胎中心线•垂直线9QualityToolsandServiceEquipmentCamber外倾角轮胎外侧磨损轮胎内侧磨损负正o10QualityToolsandServiceEquipment外倾角跑偏汽车跑偏的原因多数是外倾角不正常28”27”11QualityToolsandServiceEquipment典型的单点式调整12QualityToolsandServiceEquipment典型的双点式外倾角调整14QualityToolsandServiceEquipmentCaster主销后倾角后倾=正前倾=负•主销中心线•垂直线15QualityToolsandServiceEquipmentCaster主销后倾角过度后倾=转向困难过度前倾=方向不稳后倾角过小车易跑偏主销后倾零度主销后倾负主销后倾正16QualityToolsandServiceEquipmentCaster主销后倾角的调整20QualityToolsandServiceEquipment如何使用垫片ReadingSpecificationsAmountofChangeTotalShimsRequiredCombinedShimAmountsout3/16out1/16”ShimCamberCasterSizeChangeChange1/81/2deg1deg1/161/4deg1/2deg1/321/8deg1/4deg1/641/16degCAMBERCASTER.50-.51/4”out1/8”out1/8”3.52.5-11/8”out1/16”in1/16”21QualityToolsandServiceEquipment使用“A-Arm调整”软件Step1Step222QualityToolsandServiceEquipment主销内倾角上下转向轴线与垂直线之间的夹角SAI包容角23QualityToolsandServiceEquipment摩擦半径24QualityToolsandServiceEquipment宽胎效应钢圈的高度与形状直接影响摩擦半径25QualityToolsandServiceEquipmentAUDIA426QualityToolsandServiceEquipmentSteeringAxisInclination主销内倾SpindleArcSAIIncludedAngle27QualityToolsandServiceEquipmentSpindle轮轴故障诊断外倾角OKSAIOK包容角OK轮轴OKIncludedAngleSAICamberVerticalShortArmLongArmTwin-I-BeamMonoBeam28QualityToolsandServiceEquipmentSpindle轮轴故障诊断外倾角过小SAI过高包容角OK轮轴OKIncludedAngleSAICamberVerticalShortArmLongArmTwin-I-BeamMonoBeam29QualityToolsandServiceEquipmentSpindle轮轴故障诊断外倾角OKSAI过高包容角过高轮轴变形IncludedAngleSAICamberVerticalShortArmLongArmTwin-I-BeamMonoBeam30QualityToolsandServiceEquipmentSpindle轮轴故障诊断外倾角OKSAI过小包容角过小轮轴变形IncludedAngleSAICamberVerticalShortArmLongArmTwin-I-BeamMonoBeam31QualityToolsandServiceEquipmentFWD发动机托架LowerInnerPivotsUpperInnerPivots32QualityToolsandServiceEquipmentAUDIA433QualityToolsandServiceEquipmentFWDEngineCradle发动机托架Camber外倾角高SAI主销内倾小Incl’dAngle包容角OK外倾角小SAI高包容角OKCradleShifted发动机托架移位34QualityToolsandServiceEquipment使用发动机托架调整软件35QualityToolsandServiceEquipmentTotalToe总前束在轮轴位置车轮前测量线与后测量线之间的差总前束总前束36QualityToolsandServiceEquipment前束的表现错误的前束值=轮胎磨损37QualityToolsandServiceEquipmentThrustAngle推进线几何中心线推进线个别前束的错误=车轮错误转向Toe-outToe-in38QualityToolsandServiceEquipmentThrustAngle推进线推进线确定汽车的滑行方向TheThrustAngledictatesthevehicle'srolldirection.Thedriversteers,inthedirectionoftheThrustAngle,tocompensatefortheoutofthrustcondition.Thisresultsinthesteeringwheelbeingcocked,inthedirectionoftheThrustAngle,whenthevehicleisinmotion.39QualityToolsandServiceEquipment调整前束对前轮前束分别进行调整以保证方向盘与推进线出处于水平方向后轮不能进行调整时通常采用这种方法进行补偿40QualityToolsandServiceEquipmentAUDIA441QualityToolsandServiceEquipment检测转向连动及悬挂控制臂的平行性IfSteeringLinkageisnotParallelwithControlArm,ToeChangewilloccurduringJounce/ReboundduetoControlArmandTieRodLinkTravelingthroughdifferentarcs如果转向连动杆与控制臂运动不平行，ToeCurveMeasurementBumpSteer42QualityToolsandServiceEquipmentAUDIA443QualityToolsandServiceEquipmentTurningRadius转向半径车子转向时两只轮胎转向半径不同。要使车子围绕一个圆心运动两只轮胎的转向半径必然不同所有车轮围绕同一圆心运动20oturn18oturn44QualityToolsandServiceEquipment转向半径按规定检测内外转向角度18oturn20oturn45QualityToolsandServiceEquipmentSetback车轴偏角两个车轮不在同一轴线上，这样就形成了车轴偏角