tài liệu hệ thống lái Hyundai aero space _Steering Syste
STEERINGSYSTEMGENERAL ST - 2SPECIFICATION ST - 6SERVICE STANDARDS .ST - 7TIGHTENING TORQUE ST - 8TROUBLESHOOTING . ST - 9SERVICE PROCEDURE ST-14INTEGRAL POWER STEERING GEAR ST-27POWER STEERING OIL PUMP . ST-37POWER STEERING OIL TANK ST-43 ST-2 STEERING SYSTEMGENERALThe steering system allows the driver to freely change the traveling direction of the vehicle. The steering force of thesteering wheel is transmitted through the steering shaft, power steering gear, pitman arm and drag link to the knuckle armto steer the vehicle.The system has an integral type power steering gear installed in the gear box to reduce the steering effort.The power steering system hydraulic pressure circuits are as shown below.ECYST01AOil TankOil Pump Power Steering GearPipingKnuckle armPower steeringoil pumpPitman armPower steeringoil reservoir tankSlave leverPower steering gear1st drag link2nd draglink ST-3ECYST02ASteering LinkageDrag Link AssemblyLeaf suspension type : The drag link transmits the force of powersteering gear pitman arm to slove lever and knucle arm.Steering Wheel and ShaftThe steering shaft is a tlelscopic and tilt type which can by adjusinglock lever select the best driving position by adjusting lock lever.Lock leverFreeLockTelescopicTiltMA560040Tie Rod Assembly1. Leaf suspension type : It connects the laft and right tie-rod arm2. The connecting point of tie arod and tie rod end is tightened bya left hard bolt at left and a right hand bolt at right.Slave Lever (Leaf-suspension only)The slave lever connects the 1st drag link and 2nd drag by multi-plying the force from 1st drag link to 2nd drag link.Ball jointSpringMA560050Ball jointTie rodTie rod endMA560060Slave lever1st drag link2nd drag linkGENERAL ST-4 STEERING SYSTEMRight TurnWhen the steering wheel is turned clockwise, the load from the tires acts on the worm shaft to twist the torsion bar. As aresult, the rotor turns clockwise with respect to the worm shaft, decreasing the axial direction groove clearance. This limitsflow of the hydraulic oil to the oil tank and now the hydraulic oil from thr oil pump enters the cylinder chamber A to cause thepiston to move to the cylinder chamber B.The hydraulic oil in the cylinder chamber moves, the torsion bar that has been twisted returns to the neutral position. Theforce that has caused twisted returns to the neutral position. The force that has caused twisting of the torsion bar duringsteering is transmitted to the steering wheel as a steering reaction force which gives the driver a sence of steering response.A left turn is also made on the same operating principles as the right turn but in opposite direction.Integral Power Steering GearThis device consisting of the power cylinder section (output section) that also serves as the steering gear and the controlvalve section (control section) reduces the power required to operate the steering wheel.Straight Ahead DrivingWhen there is no steering torque from the steering wheel, no relative displacement is caused between the stub shaft andth worm shaft and hence the rotor (or spool) is at the neutral position on the worm shaft (or sleeve). Accordingly, thehydraulic oil supplied by the oil pump is allowed to flow through the worm shaft groove back to the oil tank.Namely, no pressure diffference develops between cylinder chambers A and B so that the piston (ball nut) remainsstationay at the neutral position.CYST001C / CYST001DCYST001E/ CYST001FCylinder chamber BWorm shaftStub shaftPistonRotorCylinder chamber ATorison barTo cylinderchamber BTo cylinderchamber AWorm shaftTo oil tankTo oil tankTo cylinderchamber BTo cylinderchamber ATo oil tankFrom oil pumpFrom oil pumpTo cylinderchamber BFrom oil pumpTo cylinderchamber ATo cylinderchamber BFrom oil pumpTo cylinderchamber ATo oil tankTo cylinderchamber AWorm shaftTo oil tankTo cylinderchamber BTo cylinderchamber ATo oil tankFrom oil pumpFrom oil pumpFrom cylinderchamber BRotorRotorCylinder chamber AStub shaftPistonWorm shaftCylinder chamber BTorison bar ST-5MA560110MA560120Delivery strokeSuction strokeDelivery strokeMetering orifice(develops pressure difference P P=P1-P2Rotor turningdirectionManual SteeringEven if the hydraulic pressure ceases to act on the power steeringbooster due to a stalled engine, defective oil pump, oil leaks orother causes, the mechanical power is directly transmitted fromthe stub shaft to the worm shaft by the stopper mechanism pro-vided between the stub shaft and worm, allowing manual steering.Power Steering Oil PumpThe vanes mounted to the rotor move in and out along the insidesurface of the cam ring to cause suction and discharge of the hy-draulic oil.1. Flow Control ValveThis valve causes excess amount of oil to flowback to the oiltank to keep a constant flow of oil to the power steering booster.JMS56-011Suction strokeCam ringVaneRotorChamber APumpscution portFlow control springSpoolChamber BTo powersteeringboosterWarm shaftStub shaftTorsion barMA560130Chamber AChamber BRelief springPumpscution portMetering orifice2. Relief ValveThis valve keeps a constant hydraulic pressure.As shown right, the flow control valve and the relief valve worktogether to keep a constant operating pressure.GENERAL ST-6 STEERING SYSTEMSPECIFICATIONSItemSteering wheelSteering shaft typeSteering gear typePower steering gearPower steering oil pumpPower steering oilreservoirSteering angle(Turning wheel angle)TypeO.D (Outer Diameter)TypeCylinder I.D.StrokePiston operating area (cm2)Oil capacity (TypeDisplacement (no load) cc/rev.Controlled flow ( / min)Permissible ratating range rpmTypeCapacity ( )High decklower deckSpecificationsTwo-spoke type500 mmUniversal joint (with telescopic tilt mechamism)Ball-nut typeIntergral type100 mm85.6 mm78.512.3 (125)Approx. 1.5Vane type201712.2(125)350 to 3700Separate from pump1.8-2.045374235 0°-2° 0°-2° 0°-2°InnerOuterInnerOuter 0°-2°Normal miximum hydraulicpressure MPa (kgf/cm2)Regulated pressure rpm(relief valve) MPa (kgf/cm2) ST-7Steering wheel playSteering uppershaftSERVICE STANDARDSUnit : mmSteeringwheel andshaftSteeringlinkageSteeringgearIntegralpowerstteringboosterPowersttering oilpumpNominal value(Basic diameter in [ ])15 to 350.2 or less15’ or less30’ or less[38] 0.015-0.111[42] 0.045-0.175380.2 to 0.539 to 78 (4 to 8)[90] 0.11-0.10 to 0.5[35.5] 0.01 to 0.0357.9747.97--10.3 MPa(105 kgf/cm2)----0.40.437.9--0.160.04-0.03 or more57.8747.870.090.03-Remedy andremarksAdjustCorrect or replaceassemblyReplace assemblyReplace assemblyReplaceReplaceReplaceAdjust by adjusting screwpitman arm end runoutAdjust by adjusting screwReplaceReplaceAdjust.ReplaceReplaceNo deposition, wear of flawthat may catch bar to betolerated. Replace.No deposition, wear or flawthat may catch bar to betolerated. Replace as flowcontrol valve assembly orrear body assemblyReplace as flow controlvalve assembly or rearbody assemblyPlay of joint in turning direction(play of needle bearing and spider)Play of yoke spline tube and steeringlowershaft (spline shaft) in turning directionSleeve lever shaft to bushing clearanceConnecting link plate to bushing clearanceSector shaft outside diameterSteering gear backlash(Straight ahead position)Worm starting torque after completion ofassembly (straight ahead position) Ncm (kgf·cm)Body (cylinder) to ball screw (piston) clearanceBall screw assembly play in axial directionSttering gear backlashSleeve to rotor clearanceSector shaft O.D.Ridge wear of pressure plate and side platerotor and vane sliding portionFlow control valve to rear body clearancePump relief set pressure (at 1,800 rpm)Maintenance item LimitPlay in axial direction(vertical)Pitman arm sideSide cover sidePacking portionBearing portionSERVICE STANDARDS ST-8 STEERING SYSTEMTIGHTENING TORQUESteeringshaftLinkageLink andbracketIntegralpowersteeringgearPowersteeringoil pumpSteering wheel nutSteering shaft bearing tighteningnut (lock plate)Steering shaft yoke boltLock plate stopper boltWorm shaft and yoke attaching boltGrease nippleBall stud castle nutSteering shaft mountingLock lever boltSteering lever supportingPitman arm nutBall tube screwTaper plugRetainerAdjusting screw lock nutSide cover boltAdjusting plugValve housing boltPlug (air breather)Lock ringPlugCartridge assembly screwRear body boltFlow control valve plugHose connector boltOil pump gear mounting boltPlate screwThread size Dia.x Pitch mmM20 x 1.5M52 x 1.5M10 x 1.25M5 x 0.8M20 x 1.25M6 x 0.75M20 x 1.5 M12 x 1.25M8 x 1.25M12 x 1.25M36 x 1.5M6 x 1.0PT 1/8M32 x 1.5M14 x 1.5M12 x 1.25M80 x 1.5M16 x 1.5M10 x 1.25M80 x 1.5M48 x 1.5-----M6 x 1.07839-6948-633.9-6.449-543-5200-340369.819.6390-4404.4-5.48.8-1.3115-12554-64225-245115-1256.9-13295-3905.9-8.849-5949-5918-25883.9-4.984-74.9-6.40.4-0.655.0-5.50.3-0.520.7-34.53.71240-450.45-0.550.9-1.312-135.5-6.523-2512-130.7-1.330-400.6-0.95-65-61.8-2.590.4-0.5Tighten fully, turn back by 180°, tightenagain to 39 (4), then turn back by 20°and stake.Tighten to 115 (12) and stake at 2 pointPart to be tightenedNm Kgf·mPowersteeringoil tank ST-9Probable causeHard steeringUnstablesteeringbecause ofexcessive freeplay of steeringwheelPower steeringgear mechanismdefectiveSteering linkagedefectiveFront axledefectiveOther troublesPower steeringgear mechanismdefectiveSteering linkagedefectiveFront axledefectiveOther troublesThrust bearing damageBall of ball screw wornLow fluid level in oil tankAir in oil circuit not completely bledImproper fluid viscosityTrouble in power steering gear systemIncorrect pipe connectionsDefective oil pump (or malfunction)Flow control valve in faulty operationUniversal joint abnormally worn, damaged orpoorly lubricatedDeformed linkKing pin poorly lubricatedPoor front wheel alignments(toe-in, camber, caster)Front wheel tires underinflatedThrust bearing damagedCargo and passengers are unevenly loaded in the front.Worn rack and gear in ball screw unitWorn bearing in sector shaftWorn ball in ball screwLoose power steering gear mounting boltsAir trapped and air not completely bledLooseness in universal jointLooseness in drag link ball studLooseness in tie rod end ball studWorn wheel hub bearingWorn king pin or bushingUneven brake applicationTROUBLESHOOTINGReplace screw and housingassemblyReplace screw and housingassemblyAdd fluidBleed airReplace fluidRepair or replaceCorrectRepair or replaceCorrectReplace steering shaftassembly or apply greaseReplace linkApply greaseCorrect front wheel alignmentsIn flate as specified valueReplaceDisperse the load evenlyReplace screw and housingsector shaftReplace bearingReplace screw and housingsector shaftTighten to the specified torqueAdd fluid, retighten all parts,and bleed airPack with grease. If theproblem still persists, replacesteering shaft assemblyReplace knuckle arm, pitmanarm or drag linkReplace tie rod endReplaceReplaceReadjust or replace liningSymptomRemedyTROUBLESHOOTING ST-10 STEERING SYSTEMVehicle pulls toone sideSteering wheelshimmyImproper wheel alignmentDeformed front axleWorn or deformed wheel hub bearingWorn or deformed king pinSteering wheel is off-centerPower steering gear defectiveBroken leaf springUneven brake applicationRight and left tires unevenly inflatedRight and left tires greatly different in thedegree of wearRight and left tires different in axial distanceBent rear axle housingExcessive clearance between king pin and bushingWorn or deteriorated wheel hub bearingImproper wheel alignment(particularly camber and caster)Looseness in knuckle arm or tie rod ball studExcessively uneven tire pressureKnuckle arm, tie rod arm, backing plate andnuckle, etc. Improperly tightenedU-bolt, nut, etc. of front spring looseLateral and radial runouts of front tires, andncorrect static and dynamic balanceImproper play in ball screw unit and sector shaftWorn thrust bearingDefective power steering boosterLooseness in ball stud of drag linkWorn sector shaft and bearingWorn ball and groove in ball screwExcessive runout of propeller shaftReduction pinion and gear damaged and in poortooth contactExcessive tire runoutCorrectReplaceReplaceReplace king pin or bushingCorrectCorrect or replaceReplaceRepairInflate properlyReplace tiresCorrect axial distanceReplace axle housingReplace king pin or bushingReplaceCorrect wheel alignmentReplace knuckle arm ortie rod endAdjust tire pressureTighten to specified torqueTighten to specified torqueCorrect wheel balanceAdjustReplaceCorrect or replaceReplace knuckle arm,pitman arm or drag linkReplace sector shaft and bearingReplace screw and housing assemblyCorrect or replaceReplace pinion and gearor correct tooth contactRepair or replaceFront axlesteering systemdefectiveOther troublesFront axleassemblydefectivePower steeringsystem defectiveOther troublesProbable causeSymptom Remedy 123doc.vn