JOINT STRUCTURE

PROBLEM TO BE SOLVED: To improve rigidity with respect to a flexure load acting to a T-shaped joint part.SOLUTION: A joint structure is configured so that: a second member 20 is jointed to a first member 10, and they form a T-shape; and a first upper face 11a and a flange 25 are jointed at joint parts 30a, 30b. First curvature ribs 15a, 16a are disposed on a rear side face of the first upper face 11a, separate from the second member 20 at corner parts 22b, 23b as origins, then curve in a first direction and extend in the first direction. Second curvature ribs 15b, 16b face the first curvature ribs 15a, 16a. The first curvature ribs 15a, 16b and the second curvature ribs 15b, 16b cross at two points, and define surrounding areas 15c, 16c. The surrounding areas 15c, 16c are overlapped to the joint areas of the joint parts 30a, 30b.SELECTED DRAWING: Figure 4 【課題】Ｔ字形の接合部に作用する曲げ荷重に対する剛性を向上できるようにする。【解決手段】接合構造は、第１部材１０に第２部材２０が接合され、Ｔ字形状をなし、第１上面１１ａ及びフランジ２５が、接合部３０ａ、３０ｂで接合される。第１湾曲リブ１５ａ、１６ａは、第１上面１１ａの裏側面に設けられ、角部２２ｂ、２３ｂを起点として、第２部材２０から離れ、第１方向に湾曲して第１方向に延びる。第２湾曲リブ１５ｂ、１６ｂは、第１湾曲リブ１５ａ、１６ａに対向する。第１湾曲リブ１５ａ、１６ａ及び第２湾曲リブ１５ｂ、１６ｂは、２点で交差して、囲い領域１５ｃ、１６ｃを画定する。囲い領域１５ｃ、１６ｃは、接合部３０ａ、３０ｂの接合領域に重なる。【選択図】図４