| 摘要 |
The present invention aims to manufacture a car body with ease. A hollow material 10 comprises the lower portion of a side structure 201 of the car body. A face plate 11 of the hollow material 10 at the external side of the car has a lower end which projects further downward than a face plate 12 at the internal side of the car. The lower ends of the face plates 11, 12 are connected by a rib 13. The hollow portion thus formed is triangular in shape. A rib 14 above the rib 13 is formed horizontally. The face plates 11, 12 and a rib 15 positioned above the rib 14 are eliminated from the region of one or more doorways 220. The lower end of the doorway 220 of the side structure 201 is equipped with the hollow portion, so that it stays strong against transfer of the side structure. A hollow-shaped material 110, which comprises the end portion of an underframe 203, has an end portion in the width direction which forms a slope (rib 114) facing towards the upper side of the external side of the car. Therefore, welding W1, W2 are made simple.
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