FASTENING SECTION STRUCTURE
A fastening section structure having a plurality of concentric circle-shaped rib walls (16, 17, 18) around a fastening section (14) of a member (11) having the fastening section (14). The fastening section structure has a bearing strength in at least the second-layer rib wall (17) that is lower than...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A fastening section structure having a plurality of concentric circle-shaped rib walls (16, 17, 18) around a fastening section (14) of a member (11) having the fastening section (14). The fastening section structure has a bearing strength in at least the second-layer rib wall (17) that is lower than the bearing strength in the innermost-layer rib wall (16) closest to a fastening member (15). Both reinforcement of the fastening section (14) and smooth energy absorption of an external load as a result of progressive failure can be achieved by: giving a specific relationship between the bearing strengths of the concentric circle-shaped rib walls (16, 17); enhancing the strength and rigidity of the fastening section (14); and enabling progressive failure to start from a site furthest away from the fastening section (14). |
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