| 摘要 |
PROBLEM TO BE SOLVED: To provide a shock absorbing material for a vehicle at a low manufacturing cost with good dynamic and static behavior and ideal shock absorbing property. SOLUTION: A shock absorbing material E1 for a vehicle, formed of thermoplastic resin and integrally with blow molding, includes a mainbody 1 in an almost hollow cubic shape, one recessed rib 4a and the other recessed rib formed by recessing the mainbody 1 on its contact face 2 and its supporting face 3 opposed to each other and faced to each other and a joint put in contact with the ends of both recessed ribs. On the side wall 1a of the mainbody 1, an opening 8 is formed wherein the ratio of the opening area to all area is within 0.2%-15%. The opening 8 allows the improvement of dynamic behavior during destruction due to shock. |
