| 摘要 |
PROBLEM TO BE SOLVED: To provide a hollow member for a car body frame capable of heightening the energy absorbing efficiency to a higher degree. SOLUTION: The hollow member for the car body has a polygonal profile in the section shape and is furnished with ribs tying the apices to the center shaft, wherein the inside of the intersection part of two plates constituting the peripheral circumferential wall with the ribs is shaped rounded, and the distance (h) from the virtual top point of the inside circumferential walls of the two plates lower than the top point of the peripheral circumferential wall in the intersection part in an amount corresponding to the plate thickness to the rib side end point of the rounded part is made over 13% of the distance L between the roundness end points of the two plate ends constituting the peripheral circumferential wall, which allows enlargement of the section area of that apex part of the whole section exhibiting a large plastic deformation amount to lead to enlargement of the plastic deformation region, so that the anti- buckling load can be heightened to a higher degree. This constitution allows exerting a large effect for increasing the energy absorbing amount to a higher degree without bringing about a substantial increase of the outside dimensions.
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