| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an impact reducing device for suppressing stress concentration on a collision object and diving of the collision object into a vehicle lower part with simple constitution and reduced weight and cost. Ž<P>SOLUTION: A bumper 3 is made to have a two-step structure of a front side part 5 and a rear side part 7. The rear side part 7 makes each of a groove part 9 and a groove wall 13 of the groove part 9 as a part of a wall surface, and includes a pair of cylinder bodies connected by a rear end connecting part 27 of the groove wall 13. Each of the cylinder bodies is constituted of a groove wall 13, an upper wall 21a or a lower wall 21b opposed to the groove wall 13, and front wall 17 and rear wall 19 having unevenness 45. The front side part 5 includes two sheets of wall parts 11 continuously provided on upper side and lower side of the groove part 9. When the collision object 29 collides against the bumper 3, the two sheets of wall parts 11 open upward and downward, and the front side part 5 deforms, while receiving the collision object 29 by comparatively low load, Subsequently, the groove wall 13 of the groove part 9 of the rear side part 7 opens with the rear end connecting part 27 as a center, and the rear side part 7 deforms, while firmly receiving the collision object 29 by a wide surface. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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