The suspension of our cars (II): most widely used Systems

Up to now we have spoken of the systems and most common configurations of suspension and who are those that apply to most cars. All of these components may go combined in many ways, which gives rise to the possibility of different configurations. We will describe the assemblies used by the manufacturers for both the front axle as in the rear.

The suspension on the front axle

for many years, the great majority of the vehicles ride suspensions front independent. This has the advantage of a lower unsprung weight and the vibrations that occur in a wheel do not impact on another. The advantages are many, the comfort level and effectiveness increases considerably compared to the old suspension rigid.

The elastic element most used in the front wheels, is the spring, although on some occasions it is used the torsion bar. The provisions most used are:

  • Suspension Mc Macpherson.
  • Suspension with double wishbones.

Suspension Mc Macpherson

This type of suspensions are the most commonly used due to its simplicity and good behavior. It is a spring and a shock absorber concentric whose upper end is fixed to the chassis and the bottom to the steering knuckle. The shock absorber generally comprises a support for supporting the spring on the lower end and a copela that holds it to the top. The copela will anchored to the body through silentbloc and the bottom of the steering knuckle will be subject to a trapezium articulated that, in turn joins to the chassis.

The benefits are primarily at the level of simplicity and economy, but in terms of the performance level exceeds certain limits, the system does not give more than yes and you have to go suspensions more complex as the double trapeze when we want to process certain levels of power.


this is a suspension Mc Macpherson

Suspension with double wishbones

Consists in placing two trapezoids overlapping (one lower and one upper) whose ends have a ball joint that holds the steering knuckle. The spring and the shock absorber is mounted concentric and their ends are subject, from one side to the lower trapezius, and the other to the chassis.

The two systems can be accompanied by stabilizer bars and straps of reaction that will make the work of the suspension easier.

it Is a system used in competition and in cars sporty cut for their level of effectiveness in that it offers a level of rigidity and tilt top.


Detail of suspension of double wishbones

The suspension on the rear axle

In the rear suspension it gives more variety than in the front, as there are many cars with independent suspension, and suspensions for axle rigid or semi-rigid.

Suspension by live axle

Is mostly used by all-terrain vehicles for transport. Is to have a solid axle that joins the two rear wheels. The system may be accompanied by springs or leaf springs as the elastic element, shock absorbers, straps, reaction and cross-bar. It has the great advantage of simplicity in construction and low manufacturing cost.

Another feature is the invariance of the fall of the rear wheels when driving on uneven terrain and the disadvantage that the vibrations produced in a wheel are transmitted to the other. But the main problem is that it has a large unsprung weight. This means that when you take a bump, leads to more inertia in the wheel, which translates into more rebounds and losses of adhesion.


Suspension by live axle

An intermediate solution to this problem is to mount a rigid axle and attach to the group-differential to the chassis. So you get the advantages of a rigid axle without the suspended weight is very high.

An intermediate solution to this problem is to mount a rigid axle and attach to the group-differential to the chassis. So you get the advantages of a rigid axle without the suspended weight is very high.

Suspension axle semi-rigid

it Is a shaft that joins the two arms in front of the wheels so that the arms are “trailing”. Although it can apparently be a rigid axle, the profile that takes the y-axis is in V and enables small twists. This system has great advantages, since you get very good performance with a great simplicity of manufacture.


Detail of suspension per axle semi-rigid

independent Suspension

The independent suspension is every day more used in the rear axles. In short, it is a suspension in which an axle has nothing to do with the other. Has major advantages in terms of behavior, and its main disadvantage are the costs of manufacturing. Available most used is:

  • trailing Arms with coil springs, stabilizer bars and shock absorbers.
  • trailing Arms with torsion bars, stabilizer, and shock absorbers.
  • Suspension multi-link.
  • Suspension Mc Macpherson.


this is an independent suspension