1 Mono Tube Damper Mono Tube Twin Tube Purpose Feature Improvement of comfort and handlingunder various conditionsBetter ride & road-holding performanceFeatureGas Chamber(Low pressure)Separate oil and gas chamber by free piston- Good fade performanceLight weight with less componentsHigh gas-pressure charge (app. 15~30bar)Stable damping force at any install conditions(Upright, sideways, upside-down)Base shellInnerTubeOilApplication (Domestic)Free-floating PistonBase ShellHyundaiSsangyongGenesis CoupeYF SONATAChairman-H (10MY)Gas Chamber(High Pressure)OilApplicable for rear damper only
2 Shock absorber trend Twin Tube Mono Tube Mechanism Comparison Consists of an inner andouter tube: Gas charged in outer tube(Gas filling pressure: 3 Bar)Rebound damping forceproduced by piston valveCompression dampingforce produced by bodyvalveRebound/ CompressionRebound/ CompressionConsists of a single tube: Oil and High pressuregas chamber (30bar )separated by free-floatingpistonFree-floating piston: Moves during reboundand compression strokeRebound and compressiondamping force controlled by piston valveGas Chamber(Low Pressure)PistonValvePistonValveSingleTubeInnerTubeOilTubeOuterFree-FloatingPistonOilGas Chamber(High Pressure)BodyValve
3 Benefits Twin Tube Mono Tube Performance Comparison Feature DescriptionDamping lag occurrence possibleby oil cavitation due to pressurechange ( Unbalanced R & H )DampingForceNo damping lag by oil cavitation dueto separate oil/gas chamber100Weight ratio80 ( 10 ~ 20% ↓)Variable( Damping force cannot be retainedin highly inclined conditions )Packaging( Damping force retained even onhighly inclined conditions )Disadvantage of heat emissiondue to twin tubeDurabilitySwift heat dissipation due tosingle tube designNormal response (OE-Spec)Ride & HandlingBetter response and road holdingdue to high pressure chamberLow pressure oil sealMajor ComponentHigh pressure oil sealFree floating piston addedIncreased thickness for strengthand controlled roughness of pistonsliding part on outer tube→ Higher cost compared to twin tubeDamping forceDamping forceDamping lagStrokeStroke
4 Application Examples of Non-Korean Automobile Applications BenzGMToyotaFordJaguarOpelInfinitiE350- Front / RearCADILLAC DTS- Magnetic RideControlCADILLAC SRX- RearLEXUS LS430FIVE HUNDREDX-TYPEVECTRAG37 CoupeML350 , 500CADILLAC STSCADILLACESCALADEMARK XCROWN VICTORIA- Front / Rear+ most motorsport applications and sports carsDomestic Vehicle Application TrendHyundai/KIA automobiles introduced towards the end of 2010 will apply mono tube damper technology to their medium and compact range (rear suspension)
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