The channel frame in the form of C, is strong but flexible, is used in trucks and in areas of conventional cars where you need strength and degree of flexion. The box construction is used in many conventional racks, especially when you need extra strength, the box section is constructed with two sections of canal in the form of C. The Case of the frame rails are made two beams welded at both ends to form a rectangular tube. The design of U-shaped channel, usually lighter can be used in unibody monocoque type, to form the bottom rails, which are made by spot welding a channel with eyebrows on the floor of the body or internal panel wheelhouses. In the various beams can be used tubular supplements and joists. All motor vehicles require the structure to form the chassis frame and be of sufficient strength to support the body, engine, power unit and the suspensions. These structural elements can be a separate frame in the case of conventional racks or can be welded as part of the blade flat on the unibody. Conventional vehicles are very heavy and expensive construction. Therefore, the use of conventional frame is limited to off-road vehicles such as cars, sport utility vehicles, trucks and on most large trucks and some light trucks as well as several American automobiles. As the frame is the structural element of the vehicle, must support the weight and the efforts of each component and the load it supports. The body design with conventional separate chassis allows the frame to flex or bend with the load. For example, a truck can carry a heavy load when you move into an uneven floor in a building. The frame rails are joined together with studs. The stronger beam (sometimes called a bridge) is mounted on the front of the chassis to support the engine and front suspension. Each rail is riveted or welded on the arms. All racks, conventional or unit, are narrower in the front, to allow the wheels to turn sideways with the vehicle running and, anyway, keep the same shot (distance between wheels) that the rear wheels. The greater width of the rear frame distributes the weight of the body and the load closer to the rear wheels for greater stability. Over the years, many designs have used frame, two of the most common are the ladder and Edge. The type of staircase is always used in heavy trucks. Edge type is used in some large cars and most trucks, as its perimeter offers maximum protection for occupants and the body in the event of a side collision. With this frame, which is a little wider, you get a slightly higher stability of the vehicle. The central section of the chassis for cars and trucks is depressed, to have a center of gravity lower and lower overall vehicle height, which have greater stability. Rails is curved upwards to make room for the suspensions. The frame for heavy truck does not have those curves. [1] The majority of used light vans semiunitaria or unitary structures. Text is available under the Creative Commons Attribution ShareAlike 3.0, additional terms may apply. See Terms of Use for more information.

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