| 摘要 |
<p>To achieve high sealing effect without relying on elastic deformation of a flare section, and at the same time, obtain excellent processability of the flare section. A flare-shaped end structure for a tube, where a conically spreading flare section (24) is formed at an end of a metallic tube (20) and tightening a flare nut (27) causes the flare section (24) to be pressed to a seat surface (25) of a mating member (21). The flare section (24) has a head section (30) coming into contact with the seat surface (25) and a bent section (32) continuous to the head section (30). The bent section (32) has an outer periphery section (31) on the outer side and a valley section (34) on the inner side. The valley section (34) has a valley bottom apex (34a), the apex of the valley section. The flare section (24) is shaped such that the curvature radius (R) is smaller than the thickness (t) of the tube (20).</p> |
