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AssigneesNippon Steel Corporation, Nissan Motor Co., Ltd.
InventorsShinya Sakamoto, Daigo Sumimoto, Yoshio Terada, Yukihisa Kuriyama, Hiroshi Sakurai, Eizaburou Nakanishi
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An object of the present invention is to provide a lightweight strengthening member for an automobile, excellent in crush resistance in the axial direction and having high flexural strength. Further, another object thereof is to provide a strengthening member which does not generating cracks even when a high-strength steel sheet is used. The present invention provides: a strengthening member 1 for an automobile, being a lengthy strengthening member 1 having concave portions 3 at the four corners of a basic rectangular cross section 2 and forming a cruciform closed section as a whole, characterized in that the wall thickness of the concave portions 3 is 5 to 30% thicker than the wall thickness of the portions excluding the concave portions, namely, the side walls 4 and the top walls 5; further, a strengthening member 1 for an automobile, characterized in that the hardness of the concave portions 3 is 5% or more higher than the hardness of the portions excluding the concave portions, namely, the side walls 4 and the top walls 5; and furthermore, a strengthening member 1 for an automobile formed by drawing or hydroforming.
A strengthening member for an automobile, being a lengthy strengthening member having concave portions at the four corners of a basic rectangular cross section and forming a cruciform closed section as a whole, characterized in that the wall thickness of said concave portions is 5 to 30% thicker than the wall thickness of the portions excluding the concave portions, namely, the side walls and the top walls.
A strengthening member for an automobile, being a lengthy strengthening member having concave portions at the four corners of a basic rectangular cross section and forming a cruciform closed section as a whole, characterized in that the hardness of said concave portions is 5% or more higher than the hardness of the portions excluding the concave portions, namely, the side walls and the top walls.
A strengthening member for an automobile, being a lengthy strengthening member having concave portions at the four corners of a basic rectangular cross section and forming a cruciform closed section as a whole, characterized in that:
Dependencies are inferred from the claim text.