A roll cage is a specially engineered and constructed frame built in (or sometimes around, in which case it is known as an exo cage) the passenger compartment of a vehicle to protect its occupants from being injured or killed in an accident, particularly in the event of a rollover.
Designs
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There are many different roll cage designs depending on the application. Hence, various racing organizations have differing specifications and regulations, although most of these organizations harmonize their rules with those of the FIA.[1]
Roll cages help to stiffen the chassis, which is desirable in racing applications. Racing cages are typically either bolt-in or welded-in, with the former being more straightforward and cheaper to fit while the latter is stronger and more substantial.[2]
A roll bar is a single bar behind the driver that provides moderate rollover protection. Due to the lack of a protective top, some modern convertibles utilize a strong windscreen frame acting as a roll bar.[3] Also, a roll hoop may be placed behind both headrests (usually one on older cars), which is essentially a roll bar spanning the width of a passenger's shoulders.
Road cars
editA newer form of rollover protection, pioneered on the Mercedes-Benz R129 in 1989, is deployable roll hoops that are usually hidden within the body of a car. When sensors detect an imminent rollover, the roll hoops quickly extend and lock in place. Cars that have a deployable rollover protection system include the Peugeot 307 CC,[4] Volvo C70, Mercedes-Benz SL 500, Jaguar XK,[5] and the Lamborghini Reventón Roadster.[6]
Other applications
editRoll bars are also used historically on row crop tractors, and roll cages are incorporated as part of the cab on modern tractors.
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A 2006 Subaru Impreza WRC bodyshell with integrated roll cage -
Roll cage in a Porsche 997 GT3 RS. -
A race car stripped down to its roll cage and firewalls
See also
editReferences
edit- ^ "Common regulations for competitors safety" (PDF). msauk.org. Archived from the original (PDF) on 2017-07-11.
- ^ "Roll cage- Weld in Vs Bolt in - Page 1 - General Motorsport". pistonheads.com. Retrieved 2018-05-23.
- ^ "Teknikens Värld: Provkörning av Saab 9-3 Cabriolet". Archived from the original on July 30, 2013.
- ^ "307cc-2005.pdf" (PDF). September 8, 2006. Archived (PDF) from the original on 2006-09-08.
- ^ "Archived copy". jaguar.com.au. Archived from the original on 29 April 2008. Retrieved 12 January 2022.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ Park, Barry (16 September 2009). "Lamborghini Reventon Roadster: "Our most extreme car"". Drive.com.au. Retrieved 7 December 2017.
External links
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