| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al alloy bumper reinforcing material having improved collision energy absorbing performance in offset collision without marring the advantage of a lighter weight due to the adoption of an Al alloy. SOLUTION: The bumper reinforcing material 1a is formed of an aluminum alloy hollow section with portions curved toward a body side at both ends so as to be supported at the backs of the curved portions by a bumper stay. The hollow section is formed in an approximately rectangular cross section by a front wall facing in the direction of collision, a rear wall 3 located at the rear part and side walls 4, 5 connected perpendicular to these walls. An intermediate wall 6 is provided in parallel to the side walls to form a plurality of hollow portions in the cross section. The intermediate wall 6, the side walls 4, 5 and the front wall 2 are connected together in such a manner as to reduce the wall width of the front wall, and a recessed portion 9 is formed at a connection between the front wall 2 and the intermediate wall 6 throughout the length of the hollow section.
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