Purpose, device and types of car suspensions

6.1.3.d Type of applied elastic element

And the last sign, according to which suspensions are classified into different classes, is the type of springing element used. It can be a carriage spring, a coil spring, a torsion bar (it is a rod, one end of which is fixed and does not move in any way on the car body, and the other is connected to the suspension arm), pneumatic element (based on the ability of air to compress) or hydro-pneumatic element (when air "duets" with hydraulic fluid).