Impact energy absorbing chassis - has longitudinal bearers end regions with shear off points along bearer edges

摘要

The chassis has longitudinal bearers with open or closed hollow shape. The end regions are provided with weakend points to absorb impact energy by shortening. The weak spots are formed by a stamping process along the bearer edges (4), in a partial shearing operation which does not penetrate the material. The stamping could be spherical and connect by narrow steps with the surrounding material. The steps extends lengthwise with the bearers in order to accelerate the shear off without negatively influencing the bearer. The bearer is used on bumper supports or chassis parts intended to fold up selectively upon vehicle impact.