Introduction of Suspension Audi And Peugeout

Suspension is the term to the system of spring,shock absorber and linkage that connect to the wheels and vehicles.Suspension is important to a vehicle because the suspension systems is a tool which contributing to the car's roadholding or handling and braking system for good active safety and driving pleasure, and keeping vehicle occupants comfortable and reasonably well isolated from road noise, bumps, and vibrations. It is important for the suspension to keep the road wheel in contact with the road surface as much as possible, because all the forces acting on the vehicle do so through the contact patches of the tires. The suspension also protects the vehicle itself and any cargo  from damage and wear. The design of front and rear suspension of a car may be different.

DEPENDENT SUSPENSION AND INDEPENDENT SUSPENSION

• DEPENDENT SUSPENSION

Dependent suspension is the suspension which are both the linkages are combined in a set.In a front engine, rear-drive vehicle, dependent rear suspension is either "live axle" , depending on whether or not the differential is carried on the axle. Live axle is simpler but the unspring weight contributes to wheel bounce.
Because it assures constant camber, dependent (and semi-independent) suspension is most common on vehicles that need to carry large loads as a proportion of the vehicle weight, that have relatively soft springs and that do not (for cost and simplicity reasons) use active suspensions. The use of dependent front suspension has become limited to heavier commercial vehicles.

dependent suspension

• INDEPENDENT SUSPENSION

Independent suspension is a broad term for any automobile suspension system that allows each wheel on the same axle to move vertically (i.e. reacting to a bump in the road) independently of each other. This is contrasted with a beam axle , live axle  system in which the wheels are linked – movement on one side affects the wheel on the other side. Note that “independent” refers to the motion or path of movement of the wheels/suspension. It is common for the left and right sides of the suspension to be connected with anti-roll bars or other such mechanisms. The anti-roll bar ties the left and right suspension spring rates together but does not tie their motion together.

Most modern vehicles have independent front suspension (IFS). Many vehicles also have an independent rear suspension (IRS). IRS, as the name implies, has the rear wheels independently sprung. A fully independent suspension has an independent suspension on all wheels. Some early independent systems used swing axle, but modern systems use Chapman or MacPherson, trailing arm, multi link, or wishbone.

Independent suspension typically offers better ride quality and handling characteristics, due to lower unsprung weight and the ability of each wheel to address the road undisturbed by activities of the other wheel on the vehicle. Independent suspension requires additional engineering effort and expense in development versus a beam or live axle arrangement. A very complex IRS solution can also result in higher manufacturing costs.

The key reason for lower unsprung weight relative to a live axle design is that, for driven wheels, the differential unit does not form part of the unsprung elements of the suspension system. Instead it is either bolted directly to the vehicle's chassis or more commonly to a subframe.

suspension geometry