NITRO SHOCK ABSORBERS

SUBMITTED BY: K.SRINIVAS

B.E 4/4 MECHANICAL 1601-10-736-055

Contents:

ABSTRACT

INTRODUCTION

NEED FOR SHOCK ABSORBERS

WHY GAS FILLED SHOCK ABSORBERS?

TYPES & ADVANTAGES

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.

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.

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.

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

INSIDE OF A SHOCK ABSORBER

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.

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.

.

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.

COMPONENTS

Upper and lower mounts.

Hydraulic chamber containing hydraulic fluid.

Gas chamber containing nitrogen at 25 bars.

Dividing piston.

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.

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.

TYPES

There are two types of gas filled shock absorbers-

1. Mono tube with high pressure

2. Twin tube with low pressure

ADVANTAGES

Better fade resistance.

Instantaneous response.

Better durability.

No need for re-adjustment.

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.

REFERENCES

http://en.wikipedia.org/wiki/Telescopic_shock_absorber.

http://auto.howstuffworks.com/car-suspension2.htm

www.tirereview.com/Article/98307/the_advantages_of_twintube_shocks.asp

http://www.autobizz.com.my/forum/forum/Basic-knowlege/323-Types-of-shock-absorber.html

THANK YOU!