Chassis refers to a structural frame in which all OEM (Original Equipment Manufacturer) components are installed. It functions as a "backbone" of the vehicle, which supports the load of the body, engine, transmission, and other components. It withstands stress and forces due to braking or acceleration or bad road condition.
- Modern car bodies must be designed to protect the driver and passengers in a crash to provide adequate passenger and luggage space. But the need for fuel economy dictates that cars be lighter and smaller than models of conventional vehicles.
- The separate chassis frame once gave a car its structural strength, which provides a platform for mounting its mechanical components.
- The body was bolted to this frame, which made for a high and heavy but quiet and durable automobile. Recently, cars now have unit-body construction.
- Stamped sheet-steel parts are welded together to form box structures that work much like the trusses in a bridge to form a light but strong unit.