| 摘要 |
An object of the present invention is to provide an impact energy absorber which is easy to manufacture and low in cost and absorbs high impact energy. The impact energy absorber consists of an aggregate formed by lapping a kraft paper on the outside and inside of a metal sheet such as a hard aluminum foil, and is a flexible pipe having a circular cross-sectional shape and formed with concave and convex portions in a spiral form on the surface thereof. The outside diameter of the impact energy absorber is 20 to 50 mm, the pitch of the concave and convex portions is 1.4 to 2.0 mm, and the vertical width of the concave and convex portions is 2.3 to 3.2 mm. Energy is absorbed by plastic deformation in the radial direction of the energy absorber.
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