Automobile chassis consists of four parts: transmission system, drive system, steering system and braking system. The function of the chassis is to support and fix the automobile engine, components and total distance, shape the overall design of the automobile, accept the driving force of the automobile engine, make the automobile move and ensure the normal running. Suspension types are divided into independent suspension and dependent suspension. Independent suspension includes McPherson type, wishbone type, multi-link type and integrated type. Independent suspension is superior to non-independent suspension in handling and comfort. The same multi-link independent suspension, the total number and appearance of crankshafts, the material of lower arm (steel or aluminum, castings or metal stamping parts), the type of shock absorber and the hardness of torsion spring are also different.
A non-independent car with rear suspension is called a "flatbed car", and the brand image is to install two wheels on both sides of a wooden stick (girder). In this way, the vertical deviation of one wheel will inevitably directly affect the other wheel. Dependent suspension is characterized by simple structure, low cost and small space, which is very important for small cars. In order to better ensure the indoor space of the rear seats and the capacity of the car trunk, dependent rear suspension (trailing arm type or torsion beam type is more common) is often adopted, and cars including Fiat500 recently released for fitness do not choose independent rear suspension.
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