0. Monotube Damper (

1. Mono Tube Damper Mono Tube Twin Tube Purpose Feature
Improvement of comfort and handling
under various conditions
Better ride & road-holding performance
Feature
Gas Chamber
(Low pressure)
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)
Base shell
Inner
Tube
Oil
Application (Domestic)
Free-floating Piston
Base Shell
Hyundai
Ssangyong
Genesis Coupe
YF SONATA
Chairman-H (10MY)
Gas Chamber
(High Pressure)
Oil
Applicable for rear damper only

2. Shock absorber trend Twin Tube Mono Tube Mechanism Comparison
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
Rebound
/ Compression
Rebound
/ Compression
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
Gas Chamber
(Low Pressure)
Piston
Valve
Piston
Valve
Single
Tube
Inner
Tube
Oil
Tube
Outer
Free-Floating
Piston
Oil
Gas Chamber
(High Pressure)
Body
Valve

3. Benefits Twin Tube Mono Tube Performance Comparison Feature
Description
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
100
Weight ratio
80 ( 10 ~ 20% ↓)
Variable
( Damping force cannot be retained
in highly inclined conditions )
Packaging
( 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
Damping force
Damping force
Damping lag
Stroke
Stroke

4. Application Examples of Non-Korean Automobile Applications
Benz GM
Toyota
Ford
Jaguar
Opel
Infiniti
E350
- Front / Rear
CADILLAC DTS
- Magnetic Ride
Control
CADILLAC SRX
- Rear
LEXUS LS430
FIVE HUNDRED
X-TYPE
VECTRA
G37 Coupe
ML350 , 500
CADILLAC STS
CADILLAC
ESCALADE
MARK X
CROWN VICTORIA
- Front / Rear
+ most motorsport applications and sports cars
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)