Patent ID: 7665586
Filing Date: 2010-02-23
Classification: F16F

Abstract:
1. A crash box having a tubular body having a flat cross sectional shape with a flatness of at least 1.3 and at most 2.0, characterized in that over the entire length of the tubular body in the axial direction, the transverse cross-sectional shape in the axial direction of the tubular body is a polygon, for at least a first side forming the polygon, when the angle formed by second and third sides which adjoin the first side is α, the relationship between the length (L wherein the equation means that the length L the angle α is at least 100° and at most 140°, and the flatness is defined by the ratio (L wherein the distance (L wherein, when an impact is applied in the axial direction from one end of the tubular body in the axial direction, the tubular body, by virtue of the transverse cross-sectional shape and satisfying the equation relating to the first, second and third sides, absorbs the impact energy by the sides of the tubular body buckling in a uniform fashion along the length of the tubular body.