CRASH BOX AND AUTOMOBILE BODY

摘要

Provided is a crash box having robustness higher than that discussed in JP 2011-51581 A. The crash box includes a metal tubular body of a rectangular basic cross-sectional shape having a pair of corner portions arranged oppositely and another pair of corner portions arranged to intersect at an angle of 80° or larger and 100° or smaller. An angle of the pair of corner portions (32 and 33) is set to 90° or larger and 150° or smaller, and an angle of the another pair of corner portions (34 and 35) is set to 30° or larger and 90° or smaller. One or more inwardly convex trench portions 36 to 39 extending in a longitudinal direction are provided. A cross-sectional peripheral length of the tubular body (31) in the one end side (31a) is shorter than a cross-sectional peripheral length of the tubular body (31) in the other end side (31b). An aspect ratio (flatness) between the longest one and the shortest one of diagonal lines of a polygon of the basic cross-sectional shape changes depending on a position on the axial direction of the tubular body (31). Opposite slope surfaces of the trench portions (36 to 39) have different heights, so that overall sides on the cross section in the one end (31a) are formed in parallel to the opposite sides on the cross section in the other end (31b).