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An anti-roll bar (roll bar, anti-sway bar, sway bar, stabilizer bar) is an automobile suspension part that helps reduce the body roll of a vehicle during fast cornering or over road irregularities. It links opposite front or rear wheels to a torsion spring using short lever arms for anchors.
An early application of a torsion bar in an American car was by Hudson Motor Car Company of Detroit who had introduced the innovative front axle flex suspension in 1934 Hudson and Terraplane cars and realized for 1935 that a transverse torsion bar linked to the rear axle was needed as an anti-roll bar to stabilize the cars.
The assembly can be further simplified, if needed, by substituting an anti-roll bar (torsion bar) for the radius arm. [14] For those reasons, it has become almost ubiquitous with low cost manufacturers. Furthermore, it offers an easy method to set suspension geometry. [15] Many modern versions replace the lower control arm with a wishbone.
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Body roll, represented by the character ΙΈ. Body roll is the axial rotation of a vehicle’s body towards the outside of a turn. Body roll occurs because the compliance in vehicle suspension allows the vehicle body, which sits upon the suspension, to lean in the direction of the perceived centrifugal force acting upon the vehicle.
Not very easy to adjust for reduced roll stiffness, but increasing it is easily done by adding an anti-roll bar; Welds see a lot of fatigue, may need a lot of development; Not much recession compliance: can be poor for impact harshness, and will cause unwelcome toe changes (steer effects)
Some automobile models have begun to adopt the phrase, substituting system for structure in the ROPS acronym, notably the Volvo C70 convertible models, and Jaguar XK. Their ROPS structures consist of two pyrotechnically charged roll hoops hidden behind the rear seats that will pop up in the case of a roll-over to protect the occupants. If the ...
Roll bar or rollbar may refer to: Roll bar, also known as anti-roll bar or sway bar, a torsion spring bar that reduces vehicle roll; Roll cage, a vehicle frame designed to protect occupants in the event of a crash; Rollover protection structure, or rollover bar, similar in purpose to a roll cage, and fitted to open-topped cars or agricultural ...