Vehicle wheels are vehicle support point, and serve as shock damping member disposed between the body and suspension.Many reasonable notice that the role played by the spring (spring).
This is absolutely true, but the spring is only in one direction. She is not able to quickly and effectively extinguish the vibrations caused when driving on uneven surfaces, so the shock absorber, which works in the opposite direction of the spring, it adds, minimizing possible fluctuations of the body.
There are only two types of shock absorbers – oil and gas. In this article we will look at their differences and peculiarities, and analyze their advantages and disadvantages.
In most cases, for each wheel (pivot point) of the vehicle is set in one shock absorber. This layout is a classic. Sometimes, however, for each fulcrum is used from two or more shock absorbers, but it is a special case, which has not seen much use.
The operating principle of the shock absorbers.
Before examining the principle of the shock absorber should be familiar with the peculiarities of its construction. Shock is a cylinder. A piston located within the cylinder, which is provided with check valves with different flow section and, consequently, with different bandwidth.
During compression damper flow passable medium (eg, oil) is quite significant, and in tension – valves, on the contrary, to limit consumption, resisting stretching the shock absorber.
To extinguish the sharp internal vibrations and shocks arising from the movement of the piston inside the cylinder body, the shock absorber can be used in so-called airbags. The latter may vary implementing the principle, but they can not only pay off the fluctuations, but also provide a smooth ride on the changing force.
Shock absorbers with gas chambers are called the gas. The key difference of the gas chambers of the air is their ability to change their stiffness nonlinear law. Simply put, their rigidity is increased in tension or compression, which is not typical for liquids.
Note that the pure gas shock absorbers do not happen. All shock absorbers of this type are a mixed view of the medium, ie the gas and oil, so some people call them gazomaslyanymi, although by and large it’s the same thing.
Differences and features of oil and gas shock absorbers.
Oil absorbers are considered more rigid and less in terms of inertial movement of the stem, since their structure has only one working medium – oil. Since oil is a liquid and substantially incompressible fluid all, the course of the shock absorber and force directly dependent on the flow of the medium.
Gas shock absorbers noticeably softer and more in terms of inertial movement of the rod, as their working environment partly consists of gas which is easily compressed sufficiently. Such an environment will participate in the ride, and in an effort to stem the shock absorber. A key feature of the shock absorber is its ability to change its properties due to the gas chamber, adapting to road conditions.
When driving on uneven gas spring is softer, but with significant movements of the stock, it is able to dramatically increase their rigidity. Such a wide range of work is the main advantage of gas springs.
However, all this theory. In practice, manufacturers of shock absorbers made oil dampers softer and gas – more stringent. The final result depends on the settings of valves, volume chamber and some other structural features.
What better shock absorbers, oil or gas.
Select shock absorbers should be based on the recommendations of the manufacturer of the vehicle, as experiments with shock absorbers, whose performance is significantly different from full-time, can adversely affect vehicle performance.
Experienced automakers not only to the smallest details count car suspension, but also well versed in its characteristics and methods of influence on them, so it is best to use a regular shock absorber. In most cases, any car model can be found to be suitable for oil, gas and shock.
Note that stiffer dampers are better suited for flat roads (eg road) and soft – ideal for operating the machine on an uneven surface.
Source and cost of gas and oil dampers.
Lifetime quality suspension can be up to 60 000 km. According to the statistics, are considered more reliable oil dampers, which are less likely to fail due to its simplicity.
As for prices, the gas shock absorbers for about 20% more expensive than oil. This difference in price due to the fact that the gas dampers have a more complicated design and therefore more difficult to fabricate.
An alternative view on the shock absorbers.
Some motorists believe that gas shock absorbers due to its high rigidity more athletic. It is true, as the same settings, materials and design gas shock absorbers will be softer than oil.
Note that this difference is not so significant, and the manufacturers of shock absorbers using certain settings, may make gas shock absorbers more rigid and oil – soft and smooth.
Some statistics or interesting about the shock absorbers.
According to statistics, in the shock absorbers need replacing every fourth car. Despite its small size, shock absorbers play an important role, so they wear can adversely affect the handling of the machine.
For example, it may cause an increase in braking distance, reduced grip and the deterioration of the stability of the car on the road.