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Shock Absorber

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The shock-absorber whether gas- or oil filled is widely spread

The shock-absorber is a safety item on vehicles, which cushions vibrations of sprung mass – therefore it is actually a vibration dampener and its name actually is misleading. The suspension has the task to cushion bumps caused by pot-holes and road bumps. The shock-absorber and spring are together in the tensioned suspension strut. This suspension strut is connected to the body with the dome- or suspension strut bearing.

Gas-shock absorbers and oil-shock absorbers as mono-type dampers or twin-tube dampers

Common designs of a shock absorber are hydraulic oil-shock-absorbers or gas-shock absorbers, both are filled with oil. Inside the oil-shock absorber is a piston on a rod and an oil filled cylinder. When the rod moves in an axial direction, oil flows through perforations and differences in pressure occur. This is how dampening is created. The dampening action when compressed is called pressure stage, decompression is called retraction.

The gas-shock-absorber, in comparison to the conventional oil-shock-absorber is filled with gas and oil. The gas is under pressure and prevents foaming of the oil whereby its performance and resilience is increased.  In addition gas has, even so not much, but a cushioning feature to it. A further difference is between the mono-tube – and the twin-tube shock-absorber, the latter, in comparison to the mono-tube has a balancing area into which excess oil can be let in through a valve.

Worn out shock-absorbers are a considerable safety risk and are evaluated as a serious deficit at the mandatory main-safety inspection which will lead to non-issue of the safety sticker. In your own interest, a defective oil- or gas-shock-absorber should be replaced as soon as possible.

You will find all parts, from strut-bearing to the complete suspension strut to shock-absorbers at rexbo Car Parts.