The main rocker connects the pull rod to the two subsystems. The geometry of this rocker
determines the movement of the spring-damper and the anti-roll bar as a result of the
movement of the pullrod.
Two operating conditions will be explained to show how the subsystems work to control
the movements of the suspension.
Bump situation.
If the car drives over a threshold, the left and right wheels will move up an equal
amount. This results in the same angular rotation of the left and right main rocker.
The spring-dampers are therefore actuated equally. Since left and right levers of the
anti-roll bar are rotated to the same angle in the same direction, it will not create
a reaction moment.
Cornering situation.
If the car drives through a corner, it's body will roll to the outside of the bend. As
a result, the outer wheel moves up with respect to the chassis, and the inner wheel
will move down. This means the main rockers are rotated in opposite directions.
The load on the outside spring will become higher, while the inside spring will be
(partially) unloaded. The anti-roll bar will be twisted, which results in an opposing
moment that tries to keep the vehicle body level.