Gas
shock absorber or Gas shocks or pressurized shock absorber is the important
invention in the automobile industry. Smooth and safe drive is the major
consideration for the driver. Driving can be enjoyed by using this shocks
that can be valved in a different way and give a smooth ride. The damping
consistency of this device is simply excellent. It is more advance and
effective as compared to traditional shocks. At high speed the flow of the
oil can cause the oil foam which can limit the efficiency of the shock
absorber. But the gas shock absorber uses the nitrogen gas that limits this
phenomena and increases the efficiency of the shock absorber.
How Gas or Pressurized Shock Absorber Works?
Gas shock absorber are less susceptible to aeration as compared to
traditional shock absorber. The reason behind this is that the gas shock
absorber contains pressurized nitrogen inside the shock body. The pressure
of the gas lies between 80 to 350 or more p.s.i. This prevents the aeration
of the oil as nitrogen does not mix with the shock oil. Also the nitrogen
also forces the oil molecules to stay together thereby preventing the oil
from getting any air bubbles within.
Types of Gas Shock Absorber
Benefits of Gas
Pressurization
The movement of the piston into a non-pressurized hydraulic twin-tube
shock absorber causes the oil to pass through the base to and from the
outer-tube. The outer tube acts as a reservoir. For smooth movement part
of the reservoir is filled with air. The air however causes the foaming
and reduces the efficiency of the shock absorber drastically. Modern gas
pressurized shock absorber makes the use of nitrogen gas instead of air
that reduces the instance of foaming and enhances the efficiency of the
shock absorber. |
There are two popular type of gas shock absorbers which are as follows:
High pressure single tube shock absorbers 
The working principle of the Gas shock absorber is same. In this shock
absorber also, the piston moves in an oil filled tube. But the difference
with traditional shock absorbers lies in the fact that a small quantity of
nitrogen under high pressure is kept at the one end.
The absorber consists of a floating piston that prevents the mixing of the
gas with the oil. The piston rod displace the oil which compresses the
nitrogen even further. The changing gas volume, plays the role of an
equalization tube. The gas exerts pressure on the oil lead to the quick
response of the piston valve. The pressure so exerted also minimizes the
aeration and the foaming which effects the functioning of the shock
absorber.
In conventional shock absorber heat is trapped in shock absorber thereby
affecting its performance and longevity. Modern mono or single tube gas
shock absorber are fabricated in such a way that extra heat generated from
the oil is transferred to the outer surface of the shock body and dissipate
more efficiently. As heat builds up, the dividing piston causes the
expansion of the aeration (foaming) and viscosity loss. This also helps the
shock to retain the damping characteristics.
Low Pressure gas twin-tube shock absorbers
In the low pressure gas twin- tube shock absorber, twin tube is retained.
At the top of the tube there is nitrogen gas under low pressure is kept
which reduces the foam formation and enhances the capability of the shock
absorber. The bottom-end softness can be easily fine-tuned in low pressure
gas twin tube shock absorber. The bottom end softness determines the comfort
that is experienced while driving at low speed. This makes the low pressure
system comfortable and more desirable.
