Chassis function restricted meaning: what is it, definition and concept

Chasis is a term that comes from the French word châssis . Although it is a concept that is frequently used, many times there are misunderstandings with its meaning or scope, since it is often confused with other structures .

It is called chassis (with an accent on the I ), the frame that provides support to the body of a car . From this definition, we can already see that the chassis and the bodywork are different things.

what is the chassis

It can be said that the chassis is the skeleton of the vehicle. It is an internal component that integrates and supports the engine, transmission and suspension, among other mechanisms and systems essential for the operation of this means of locomotion.

The stability and robustness of a car largely depend on the chassis. It is important to keep in mind that it makes it possible to assemble the rest of the parts and devices that make up the car .

In general, the chassis consists of beams and tubes of different sizes depending on their function. The most used materials are metals and alloys .

Classification according to type

There are two main types of chassis: the independent chassis and the monocoque or self-supporting chassis . In the case of the independent chassis, it can be a rack or a center tunnel .

The frame independent chassis is made up of cross beams (known as cross members ) and longitudinal beams (the stringers ). All the parts and mechanical assemblies of the vehicle are attached to it in various ways. It should be noted that this frame – used by trucks , buses and SUVs – is often also referred to as a chassis.

The central tunnel chassis , meanwhile, has a rectangular structure of tubes, to which the suspension anchors are attached . Therefore, it lacks the cross members and rails that the frame chassis has.

The monocoque chassis , for its part, is characterized by its manufacturing method. This chassis is built in a single piece : the various mechanisms and structures, including the bodywork, are joined together using welding . This chassis is used in most automobiles or cars .

Difference between chassis, body, frame and platform

We have already indicated that the chassis is the internal structure of a car that gives support to the bodywork and serves to integrate the other components of the vehicle. The idea of ​​frame can also refer to this kind of frame, although it usually refers specifically to a part of the chassis (specifically the structure formed by the cross members and the longitudinal members).

According to the dictionary of the Royal Spanish Academy ( RAE ), the notion of platform can be used to refer to the chassis or the frame. Another definition, on the other hand, speaks of the platform as the set formed by the base, the steering, the axles, the suspension and the engine compartment. This set can be shared by different brands in different models.

As for the bodywork , it is the part of the car that is located on the chassis, covering the engine and providing the interior space for the transfer of passengers and luggage. The shape of the body means that a car can be a sedan, a coupé, a three-door, a five-door or a family car, for example.