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Vehicle frame
Main supporting structure of a motor vehicle / From Wikipedia, the free encyclopedia
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A vehicle frame, also historically known as its chassis, is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism.
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/ToyotaTundraChassis.jpg/640px-ToyotaTundraChassis.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Proton_Prev%C3%A9_RESS_%28Reinforced_Safety_Structure%29_%2803%29.jpg/640px-Proton_Prev%C3%A9_RESS_%28Reinforced_Safety_Structure%29_%2803%29.jpg)
Until the 1930s, virtually every car had a structural frame separate from its body. This construction design is known as body-on-frame. By the 1960s, unibody construction in passenger cars had become common, and the trend to unibody for passenger cars continued over the ensuing decades.[1]
Nearly all trucks, buses, and most pickups continue to use a separate frame as their chassis.