Structural member

Patent metadata

Field	Value
Publication number	US-12358333-B2
Application number	US-202218288911-A
Country	US
Kind code	B2
Filing date	May 11, 2022
Priority date	May 11, 2021
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

The present disclosure provides a structural member comprising an edge portion T 1 and an edge portion T 2 opposing the edge portion T 1 in plan view in height direction (Z axis direction); when an axis direction connecting the edge portion T 1 and the edge portion T 2 is regarded as an X axis direction, the structural member includes, along the X axis direction, a region A including the edge portion T 1 , and a region B located on the edge portion T 2 side than the region A and including the edge portion T 2 ; in a cross-section perpendicular to the X axis direction, the region A includes a closed cross-section portion A whose outer rim shape is one closed cross-section A; and the region B includes a closed cross-section portion B satisfying a predetermined (i) or (ii).

First claim

The invention claimed is:

1. A structural member comprising an edge portion T 1 and an edge portion T 2 opposing the edge portion T 1 in plan view in height direction (Z axis direction);
when an axis direction connecting the edge portion T 1 and the edge portion T 2 is regarded as an X axis direction, the structural member comprises an edge portion T 3 located on a Y axis direction (an axis direction orthogonal to the X axis direction) side than the edge portion T 2 , the structural member includes, along the X axis direction, a region A including the edge portion T 1 , and a region B located on the edge portion T 2 side than the region A and including the edge portion T 2 and the edge portion T 3 ;
in a cross-section perpendicular to the X axis direction, the region A includes a closed cross-section portion A whose outer rim shape is one closed cross-section A; and
the region B includes a closed cross-section portion B satisfying the following (i) or (ii):
(i) in a cross-section perpendicular to the X axis direction, the closed cross-section portion B includes a closed cross-section B 1 and a closed cross-section B 2 those are connected via a bottom portion constituting a concave portion, and are placed apart from each other, the closed cross-section B 1 extends from the edge portion T 1 side to the edge portion T 3 side, and the closed cross-section B 2 extends from the edge portion T 1 side to the edge portion T 2 side, or
(ii) in a cross-section perpendicular to the X axis direction, the closed cross-section portion B incudes an open cross-section B 1 and an open cross-section B 2 those are formed by dividing one closed cross-section B with a concave portion, and in the closed cross-section B, a depth of the concave portion in the Z axis direction is 50% or more with respect to a maximum length of the closed cross-section B in the Z axis direction, the open cross-section B 1 extends from the edge portion T 1 side to the edge portion T 3 side, and the open cross-section B 2 extends from the edge portion T 1 side to the edge portion T 2 side.

2. The structural member according to claim 1 , wherein the closed cross-section portion B satisfies the (i).

3. The structural member according to claim 1 , wherein the closed cross-section portion B satisfies the (ii).

4. The structural member according to claim 1 , wherein, along a direction (+X direction) from the edge portion T 1 to the edge portion T 2 , a shape of a closed cross-section portion, in a cross-section perpendicular to the X axis direction of the structural member, is formed so as to be varied continuously from the closed cross-section portion A to the closed cross-section portion B.

5. The structural member according to claim 1 , wherein, in plan view in the height direction (Z axis direction), and a length of the structural member in the Y axis direction is regarded as L SY , the structural member has a curved shape in which the L SY is enlarged along a direction (+X direction) from the edge portion T 1 to the edge portion T 2 ; and
the closed cross-section B 1 is placed along an inner rim portion of the curved shape, and the closed cross-section B 2 is placed along an outer rim portion of the curved shape.

6. The structural member according to claim 1 , wherein, in plan view in the height direction (Z axis direction), an arbitrary axis parallel to the X axis direction and crosses the edge portion T 2 is regarded as an X 1 axis, a length of the region A in the X 1 axis is regarded as L AX , and a length of the region A in the Y axis direction at an arbitrary point P A on the X 1 axis in the region A is regarded as L AY , L AX /L AY satisfies 1.0 or more and 4.0 or less at least at any one of the point P A .

7. The structural member according to claim 1 , wherein the closed cross-section portion B is constituted with one member.

8. The structural member according to claim 1 , wherein the closed cross-section portion B is constituted with two or more members.

9. The structural member according to claim 1 , wherein the structural member is a structural member of an automobile.

10. The structural member according to claim 1 , wherein the structural member is a front lower arm.

11. The structural member according to claim 1 , wherein at least a steel plate is used as a material constituting the structural member, and a tensile strength of the steel plate is 780 MPa or more.

Assignees

• Nippon Steel Corp

Inventors

• Kato Ryoma
• Tabata Ryo
• Kawachi Takeshi

Classifications

• B60G2206/722

  Plates · CPC title

• B60G2206/122

  the arm having L-shape · CPC title

• B60G2206/012

  Hollow or tubular elements · CPC title

• B60G2206/821

  by gluing · CPC title

• B60G2206/8201

  by welding · CPC title