ASTON MARTIN - DB 2/4

آستون مارتين - دي بي 2/4

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A sway bar (also called an anti-sway bar or anti-roll bar (ARB) or roll bar) is an automobile suspension device. It connects opposite (left/right) wheels together through short lever arms, with the center of the bar attached to the chassis or body of the vehicle, and acts as a torsion spring to couple the vertical motion of the wheels on one end of the car more, and to reduce body roll in corners. When the body begins to roll, it acts on the sway bar to transfer some of the excess weight from the outside wheel to the inside one.

The effect of these motions is reduced body lean and improved traction in corners. Increasing the stiffness (usually increasing the thickness, but occasionally shifting the mounting points to provide a different degree of leverage) of the bar on one end of the car tends to increase the amount of traction of the other end during turns. In the interests of safety, most production automobiles have a single sway bar at the front of the car only (or none at all), so that the front wheels lose traction before the rear; as a result, they are extremely resistant to oversteer and spinning at the limits of traction. Enthusiasts, however, prefer a car with less understeer so that it will enter turns more responsively, and are willing to make the extra effort required by the reduced natural straight-line stability caused by adding a rear sway bar. Sway bars must be carefully selected, however; a common error is to select too heavy a bar in an effort to mimic a high performance car, which unbalances the rest of the suspension causing excess oversteer or understeer. Too stiff a sway bar can also lead to a harsh ride, as bumps will be transmitted to the entire end of the car rather than be absorbed by a single wheel. Active anti-roll bars attempt solve these problems.

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