Rockers for vehicles and vehicles comprising such rockers

A vehicle comprising a rocker of a central underbody, the vehicle and the rocker comprising

• a main elongation axis, a width axis and a height axis, a lower portion and an upper portion, the rocker further comprising:
• a central core comprising a length extending along the main elongation axis and a height extending along the height axis;
• two hollow units extending along the length of the central core and arranged on one side and the other of the central core such that one of the units is closer to an outside of the vehicle than the other unit, and such that a cross-section of the units, in the main elongation axis, forms a closed polygon on the length of the central core;
• two flanges projecting from the lower portion and upper portion of the rocker;
• wherein
• the units comprise a height extending along the height axis, and the sum of the height of the two units is not more than the height of the central core that separates the two flanges;
• the rocker is adapted such that, when it is subjected to bending created by application of a force extending along the width axis or the height axis, it comprises a neutral elongation axis situated between the two units and which delimits a first area of the rocker that is subjected to tension and a second area of the rocker that is subjected to compression, and at least 80% of one of the units is situated in the first area and at least 80% of the other unit is situated in the second area;
• the unit that is arranged closest to the outside of the vehicle is situated closer to the upper portion of the vehicle than the other unit.