The objective of this work is to analyze the main geometric variables that alter the stiffness of the anti-roll bar, which consequently influence the charge transfer between the wheels of the axle, while in a curve, and the body roll. The study was based on the application of this component in a vehicle of simplified construction, but the methodology can also be applied to commercial vehicles.
To calculate the stiffness a software, based on the Finite Element Method, was used. In the numerical model was applied a unit force at the ends of the anti-roll bar and was observed the response of the system in terms of deformation. It was verified the change in stiffness caused by varying the position of the bushings that are used to hold the bar, profile cross-section and the change of the opening angle of the arms.
Equations from the literature were used to determine the action of centrifugal force on the roll angle of the body, however they do not take into account all the characteristics of the suspension. It was considered the equilibrium condition between the moments of the force acting on the suspension and non-suspended masses and moments of reaction of the springs and anti-roll bar used in suspensions.
The ratio between stiffness and weight served as a comparison for the bars, and revealed for what configuration studied was achieved the best effect in reducing rollover and with minor addition of weight to the vehicle. It was possible to obtain a considerable gain in reducing rolling when using the anti-roll bar.