What Is A Heave Spring or Third Element?

Have you ever wondered how the modern race cars fit anti-rollbar's into such a cramped environment while also keeping weight down?

third element

Here we see on the Jota Sport Oreca LMP2 car that they use a suspension component known as a 3rd element. This is essentially a torsion bar of a specific stiffness that acts as an #antiroll bar. When one wheel comes under compression it moves the pushrod via bellcrank to the torsion bar. As both wheels are connected to it the force applied in a specific direction is inversely proportional to the other wheel.

motorsport wheel alignment8

The only way to adjust the stiffness of this style is by swapping out the torsion bar for another of a different diameter. Other styles that look similar in design use a revolute joint and a blade type anti-roll bar, this style can be adjusted by the driver from the driver's seat. The damper in the middle acts for heave, this comes into effect when the car moves vertically, therefore both wheels moving up and down allow the car to remain at an optimal height under high loads produced by the aero.

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