Patent ID: 8870261

Claim:
A crash reinforcing member for a vehicle comprising a long body, the body including: a pair of opposed walls each having front and rear ends, a flat center flange disposed between the front ends of the walls, a pair of curved corners which connect the front ends of the walls and the center flange with each other, and a pair of outer flanges extending outward from the rear ends of both of the walls, in which a transverse cross-section of the body has a hat-shaped opened cross-sectional shape which opens toward the rear ends of both the walls by the pair of walls, the center flange, the pair of curved corners and the pair of outer flanges, wherein: the body includes a first section which occupies the center section of the body, a pair of third sections located on both sides of the first section in its longitudinal direction, and a pair of second sections which are respectively connected with the third sections and which extend to both ends of the body in the longitudinal direction, and the body has a shape which is symmetric with respect to the center section in the longitudinal direction, a width (C 1 ) of the center flange in the first section is wider than a width (C 2 ) of the center flange in the second section, a cross-section of each of the pair of curved corners is of an arc shape having a central angle of 90°, when a cross-sectional radius of the curved corner in the first section is defined as “R 1 ” and a cross-sectional radius of the curved corner in the second section is defined as “R 2 ,” a ratio (R 1 /R 2 ) of the radius R 1 and the radius R 2 is set in a range of 1/2 to 1/5, a cross-sectional height (H 1 ) of the first section is higher than a cross-sectional height (H 2 ) of the second section, and the third section is provided as a gradually changing portion which smoothly connects the first section and the second section with each other.