| 摘要 |
PROBLEM TO BE SOLVED: To provide a chassis frame structure capable of increasing energy absorbing quantity while suppressing an increase in the peak of wall reaction force at collision time, in a structure including a front underrun protector. SOLUTION: In a pair of side rails 2, 2 disposed in a width direction W of a vehicle, each extending in a back and forth direction F of a vehicle, a first section 2C whose height becomes lower toward a tip end 2A thereof and a second section 2C from an end b of the first section to an end surface 2D on the tip end side are formed. The front underrun protector 7 extending in the width direction at the side rails located in the section 2C is mounted, wherein a part 9a thereof is projected from the end surface 2C toward the front side of the vehicle and the front underrun protector 7 is mounted at the lower surfaces 2E of the side rails so as to connect the both side rails. Supposing a height of the side rail in a section 2B is A, a length of the section 2B in the back and forth direction is B, and a length of the section 2C in the back and forth direction is C, a ratio of medium values of A:B:C is approximately 1:2.5:8.7. COPYRIGHT: (C)2003,JPO
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