First, let us look at what is hanging: suspension between the car frame and axle or wheel power transmission connection device general suspension's main role is to pass the role of all the forces between the wheels and the body and torque, such as the supporting force, the braking force and driving force, etc., and easing the impact load transmitted to the vehicle body by the uneven road, attenuation, thereby causing the vibration to ensure occupant comfort and to reduce the dynamic load of the cargo and the vehicle itself. Typical automotive suspension structure composed by the elastic member, the damper, and guide means, these three parts, respectively, since the buffering, damping, and force transmission effect. The vast majority of suspension more having a helical spring and shock absorber structure, but different type of suspension of the guide mechanism is a big difference, which is also the hoisting of the core member of the performance difference. According to the different structures can be divided into non-independent suspension and independent suspension two.

  Suspension frame and wheels flexibly linked to a variety of performance related to car, the car is the most important one of the three assembly (the other two are: the engine and gearbox). From a structural point of view, the car hanging only by simple components such as some rod, tube, and spring, but the automotive suspension is a very difficult to achieve the perfect vehicle assembly requirements, this is because the suspension is necessary to meet the vehicle handling and stabilityrequirements, but also to ensure the comfort of the car, these two aspects are mutually contradictory.In order to achieve a good comfort, we need to significantly buffer the shock of the car, so the spring is necessary to design softer spring soft but it is easier to make the car brakes occurred "nod" accelerate the rise of "serious roll bias, is not conducive to the automotive easily lead to vehicle handling and steering instability.

    Suspension components but the determination of the parameters is quite complex, manufacturers not only have to consider the comfort of the car, also take into account the cost problem handling stability. Based on these three issues, different manufacturers have different tendency strategies.More common five also had a domestic suspension: McPherson independent suspension, double-wishbone independent suspension, the single longitudinal arm torsion beam semi-independent suspension, and link strut type independent suspension, multi-link independent suspension.