| 摘要 |
The aim of the present invention is to provide a method and apparatus in which a continuous and long displacement is ensured while the dynamic kinetic energy of a vehicle is absorbed by the kinetic friction force and rolling force produced by dragging the surface of a rolled tube made of soft materials, to thereby maintain the maximum ride-down deceleration being applied to the vehicle and vehicle occupants at a slow level, and enable a PHD evaluation index to satisfy the requirements of the vehicle occupant safety index, thus safely protecting vehicle occupants from a fatal impact. For this purpose, the present invention is configured such that the front end of the rolled tube, to which the largest dynamic kinetic energy of the vehicle is to be applied, has a maximum ride-down deceleration of 20g or lower by means of the kinetic friction force of a first dragging kinetic friction force inducing element, the intermediate portion of the roller tube has significantly reduced kinetic energy by means of a second dragging kinetic friction rolling force inducing element which has a coefficient of kinetic friction larger than that of the first dragging kinetic friction force inducing element (that is, µ2 > µ1), and the residual amount of the kinetic energy of the vehicle is completely absorbed by second and third dragging kinetic friction rolling force inducing elements installed along the length (S) of a stopper. |
