| 摘要 |
FIELD: transport.SUBSTANCE: invention relates to automotive industry. Bumper assembly for trucks and buses comprises bumper attached to body frame, resilient-hysteresis element and shell. Said shell collapses at collision, tightly fits over resilient-hysteresis element and is rigidly secured at said bumper. It is made of polymer or HDPP, or thin metal sheet. Resilient-hysteresis element is made of resilient nonwoven wire material. Method of resilient-hysteresis element production consists in forming the workpiece from coils made of steel hard-drawn wire expanded to pitch equal to their diameter. Resilient-hysteresis element is then made by forming the workpiece the mould. First, equal strips of prestressed woven parallelogram-shape gauze are made at machine tool. Said strips are coppered in the bath. One strip is laid on the other so that angle between axes of said strips makes 90 degrees. Skewed ends of every strip are bent to the same strip so that a constant-depth rectangular strip results. Formed strips are laid one on the other. Assembled workpiece is compacted at moderate force. Workpiece is fitted into mould to be finally formed. Resilient-hysteresis element is withdrawn from the mould to use the appliance for bending of its ends so that its follows the bumper outer contour.EFFECT: simplified design, higher safety at frontal collision.10 cl, 12 dwg |
