| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve a collision characteristic with respect to a vertically eccentric collision load or a load bearing characteristic at tie down while suppressing enlargement and increase in weight of a crash box in a bumper system 1 using the crash box 3 comprising an extrusion hollow member of an aluminum alloy having a substantially figure-eight cross section. Ž<P>SOLUTION: The aluminum alloy extrusion hollow member has the substantially figure-eight cross section in which two vertically flattened substantially hexagonal or octagonal cross sections share their one side so as to be vertically superimposed and integrated. The flattened hexagonal or octagonal cross section is a shape flattened by vertically expanding a regularly hexagonal or octagonal cross section while keeping its width. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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