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Monotube Damper

(www.mandoparts.com)(www.mandoparts.com)

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Mono Tube DamperMono Tube Damper

PurposePurpose PurposePurpose

FeatureFeature FeatureFeature

ApplicationApplication (Domestic) (Domestic)ApplicationApplication (Domestic) (Domestic)

Improvement of comfort and handling under various conditions

Better ride & road-holding performance

Hyundai Ssangyong

Genesis Coupe YF SONATAChairman-H

(10MY)

Separate oil and gas chamber by free piston - Good fade performance

Light weight with less components High gas-pressure charge (app.

15~30bar) Stable damping force at any install

conditions (Upright, sideways, upside-down)

Gas Chamber

(High Pressure)

Free-floating Piston

Base shell

Base Shell

Oil

Inner

TubeOil

Mono Tube Twin Tube

Applicable for rear damper only

Gas Chamber

(Low pressure)

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Twin Tube Mono Tube

Consists of an inner and

outer tube

: Gas charged in outer tube

(Gas filling pressure: 3 Bar)

Rebound damping force

produced by piston valve

Compression damping

force produced by body

valve

Outer Tube

Body

Valve

Oil

Piston Valve

InnerTube

Gas Chamber

(Low Pressure)

Rebound

/ Compression

Oil

SingleTube

Mechanism Comparison

Shock absorber trendShock absorber trend

Rebound

/ Compression

Piston Valve

Free-Floating Piston

Gas Chamber

(High Pressure)

Consists of a single tube

: Oil and High pressure

gas chamber (30bar )

separated by free-floating

piston

Free-floating piston

: Moves during rebound

and compression stroke

Rebound and compression

damping force controlled by piston valve

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Feature Description

Feature

Damping lag occurrence possible by oil cavitation due to pressure change ( Unbalanced R & H )

Damping Force

No damping lag by oil cavitation due to separate oil/gas chamber

100Weight ratio

80 ( 10 ~ 20% ↓)

Variable ( Damping force cannot be retained in highly inclined conditions )

Packaging Variable

( Damping force retained even on highly inclined conditions )

Disadvantage of heat emission due to twin tube

Durability Swift heat dissipation due to

single tube design

Normal response (OE-Spec) Ride & Handling

Better response and road holding due to high pressure chamber

Low pressure oil seal Major

Component

High pressure oil seal Free floating piston added Increased thickness for strength

and controlled roughness of piston sliding part on outer tube

→ Higher cost compared to twin tube

Performance Comparison

Twin Tube Mono Tube

Damping lagStrok

e

Damping force

BenefitsBenefits

Damping force

Stroke

5

Benz GM Toyota Ford Jaguar Opel Infiniti

E350

- Front / Rear

CADILLAC DTS

- Magnetic Ride

Control

CADILLAC SRX

- Rear

LEXUS LS430

- Front / Rear

FIVE HUNDRED

- Front / Rear

X-TYPE

- Rear

VECTRA

- Rear

G37 Coupe

- Rear

ML350 , 500

- Front / Rear

CADILLAC STS

- Rear

CADILLAC

ESCALADE

- Rear

MARK X

- Rear

CROWN VICTORIA

- Front / Rear

Examples of Non-Korean Automobile Applications

ApplicationApplication

Domestic Vehicle Application Trend

Hyundai/KIA automobiles introduced towards the end of 2010 will apply mono tube damper technology to their medium and compact range (rear suspension)

+ most motorsport applications and sports cars