About Shock absorbers

1. 
NITRO SHOCK
ABSORBERS
SUBMITTED BY:
K.SRINIVAS
B.E 4/4 MECHANICAL
1601-10-736-055

2. Contents:
 ABSTRACT
 INTRODUCTION
 NEED FOR SHOCK ABSORBERS
 WHY GAS FILLED SHOCK ABSORBERS?
 TYPES & ADVANTAGES

3. ABSTRACT
 For a smooth and comfortable ride the
disturbing forces should be eliminated or
reduced considerably by using some devices .
Here we study about nitro shock absorbers its
principle, working, types.
 Nitro shock absorbers are high quality,
nitrogen filled shocks designed and gas charged
specifically for each vehicle application. The
addition of nitrogen under pressure limits the
foaming effect and increases efficiency.

4. INTRODUCTION
 Shock absorbers are such devices which isolate the
vibrations by absorbing some disturbing energy
themselves. Shock absorbers slow down and reduce
the magnitude of vibratory motions by turning the
kinetic energy of suspension movement into heat
energy that can be dissipated through hydraulic fluid.
Gas shocks represent an advance over traditional
shocks. The addition of nitrogen under pressure limits
the foaming effect and increases efficiency.

5. NEED FOR SHOCK ABSORBERS
 Springs alone cannot provide a satisfactorily
smooth ride.
 Oscillation of spring causes the wheel to rebound,
or bounce up and down.
 Control over the vehicle can be lost.
 Shock absorbers prevent these spring oscillations.

6. HOW IT WORKS?
 All shock absorbers use hydraulic fluid to
convert the energy of the spring to heat.
 Consists of two strokes
1. Compression &
2. Rebound

7. INSIDE OF A SHOCK ABSORBER

8.  During compression, the movement of the shock absorber
causes the piston to move downward with respect to the
cylinder tube, transferring fluid from the compression
chamber to the rebound chamber. This is accomplished by
fluid moving through the outer piston hole and unseating
the piston intake valve.
 During rebound, the pressure in the compression chamber
falls below that of the reserve chamber. As a result, the
compression valve will unseat and allow fluid to flow from
the reserve chamber into the compression chamber. At the
same time, fluid in the rebound chamber will be
transferred into the compression chamber through the
inner piston holes and the rebound valve.

9. WHY GAS FILLED SHOCKS?
 Rapid movement of the fluid between the chambers
cause foaming.
 Results in a lag because the piston moves through an
air pocket which offers resistance.
 Foaming results in a decrease of damping and a loss of
spring control.
 Pressure increases in front of the piston and drops
behind it.

10. GAS FILLED SHOCKS
 Designed to reduce foaming of the oil.
 Construction is similar except the double tube,
here a dividing piston is used.
 Two chambers – oil & gas.

11. COMPONENTS
Upper and lower
mounts.
Hydraulic chamber
containing hydraulic
fluid.
Gas chamber containing
nitrogen at 25 bars.
Dividing piston.

12. How it works?
 The piston rod is moved into the shock
absorber which displaces the oil.
 This causes the dividing piston to press on the gas
chamber, reducing it in size.
 While returning the gas pressure returns the
dividing piston to its initial position.

13.  The pressure decrease behind the working piston
cannot be high for the gas to exit from the oil
column.
 Thus the gas filled shock absorber operates
without foaming.

14. TYPES
There are two types of gas filled shock absorbers-
1. Mono tube with high pressure
2. Twin tube with low pressure

15. ADVANTAGES
 Better fade resistance.
 Instantaneous response.
 Better durability.
 No need for re-adjustment.

16. CONCLUSION
 In the current scenario of automobile industry
the need for vehicles which provides smooth
and comfort ride is growing. Nitro shock
absorbers are designed to be ultimate in
performance and comfort. In a country like
ours whose roads are not up to world standards
the need for automotive components like nitro
shocks are necessary.

17. REFERENCES
 http://en.wikipedia.org/wiki/Telescopic_shock_absorber.
 http://auto.howstuffworks.com/car-suspension2.htm
 www.tirereview.com/Article/98307/the_advantages_of_tw
intube_shocks.asp
 http://www.autobizz.com.my/forum/forum/Basic-
knowlege/323-Types-of-shock-absorber.html

18. THANK YOU!