JP-7857508-B1 - Impact absorbing member and method for manufacturing the same

JP7857508B1JP 7857508 B1JP7857508 B1JP 7857508B1JP-7857508-B1

Abstract

[Problem] To provide a lightweight and inexpensive shock-absorbing member while maintaining shock absorption performance. [Solution] The shock-absorbing member 40 is formed such that one end (hanging wall 23) of one S-shaped plate (second S-shaped plate 20B) is joined to the upper part of the crank portion (wall portion 21) of another S-shaped plate (first S-shaped plate 20A), and the lower part of the crank portion (wall portion 21) of the first S-shaped plate (second S-shaped plate 20B) is joined to the other end (upright wall 25) of the other S-shaped plate (first S-shaped plate 20A), thereby forming a cylindrical body 37 between the two S-shaped plates (between the first S-shaped plate 20A and the second S-shaped plate 20B), with a number of S-shaped plates 20 lined up along the longitudinal axis and the cylindrical body 37 extending along the cross axis. [Selection Diagram] Figure 2

Inventors

伊藤広樹
山崎弘雅

Assignees

株式会社ジーテクト

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (9)

A steel plate impact-absorbing member provided on the side of the vehicle body in preparation for a side collision, When the horizontal axis extending from the front to the rear of the vehicle body is called the longitudinal axis, and the horizontal axis extending in the width direction of the vehicle body is called the cross axis, The vehicle body has at least two cross members extending parallel to the cross axis, and side sills that extend along the longitudinal axis and house the shock-absorbing members. The length of the impact-absorbing member along its longitudinal axis is set to be equal to or greater than the distance between the two cross members. The impact-absorbing member is a strip-shaped structure in which a number of S-shaped plates are arranged along the longitudinal axis and the cylindrical body extends along the cross axis, with one end of one S-shaped plate being joined to the upper part of the crank portion of another S-shaped plate, and the lower part of the crank portion of the one S-shaped plate being joined to the other end of the other S-shaped plate, thereby forming a cylinder between the two S-shaped plates . When the side receiving the external force in a side collision is called the outside, and the side opposite this outside is called the inside, An impact-absorbing member characterized in that an outer protective member having a W-shaped cross-section and extending along the longitudinal axis to protect the cylindrical body is attached to the outer side of the cylindrical body .
The shock-absorbing member according to claim 1, The S-shaped plate material has at least a wall portion corresponding to the crank portion, an upper surface portion extending horizontally from the upper end of the wall portion, and a lower surface portion extending horizontally from the lower end of the wall portion in the opposite direction to the upper surface portion. The impact absorbing member is characterized in that the upper portion has a protruding ridge that is convex downward or upward, and the lower portion has a protruding ridge that is convex upward or upward.
The shock-absorbing member according to claim 2, An impact-absorbing member characterized by having an outward-opening groove between the aforementioned cylindrical body and an adjacent cylindrical body.
The shock-absorbing member according to claim 1 , The impact absorbing member is characterized in that the W-shaped cross-section of the outer protective member is composed of a corrugated sheet portion extending vertically and an upper plate portion and a lower plate portion extending inward from both ends of the corrugated sheet portion.
The shock-absorbing member according to claim 1, When referring to the side receiving the external force in a side collision as the outside, and the side opposite to this outside as the inside, An impact-absorbing member characterized in that an inner protective member having a W-shaped cross-section and extending along the longitudinal axis to protect the cylindrical body is attached to the inside of the cylindrical body.
The shock-absorbing member according to claim 1 , The impact absorbing member is characterized in that the outer protective member is joined to the cylindrical body by a weld bead extending along the cross axis.
The shock-absorbing member according to claim 5 , The impact absorbing member is characterized in that the inner protective member is joined to the cylindrical body by a weld bead extending along the longitudinal axis.
A method for manufacturing a steel plate impact absorbing member provided on the side of a vehicle body in preparation for a side collision, When the horizontal axis extending from the front to the rear of the vehicle body is called the longitudinal axis, and the horizontal axis extending in the width direction of the vehicle body is called the cross axis, A first forming step involves roll forming or press forming a blank material made of steel plate to obtain an outer protective member comprising a corrugated sheet portion extending vertically, an upper plate portion and a lower plate portion extending inward from both ends of the corrugated sheet portion, an upper curl portion extending upward in a curved shape from the tip of the upper plate portion, and a lower curl portion extending downward in a curved shape from the tip of the lower plate portion. A second forming step involves roll forming or press forming the blank material to obtain a plurality of S-shaped plate materials, each having a wall portion, an upper surface portion extending horizontally from the upper end of the wall portion, a hanging wall extending downward from the tip of the upper surface portion, a lower surface portion extending horizontally from the lower end of the wall portion in the opposite direction to the upper surface portion, and an upright wall extending upward from the tip of the lower surface portion. A first welding step involves arranging multiple S-shaped plates such that one end of one S-shaped plate strikes the crank portion of another S-shaped plate, and the crank portion of the first S-shaped plate strikes the other end of the other S-shaped plate, and then laser welding the S-shaped plate and the adjacent S-shaped plate together along the cross axis to form a weld bead along the entire length of the cylindrical body, and repeatedly joining the adjacent S-shaped plate to the S-shaped plate with the weld bead to obtain a strip-shaped structure, A method for manufacturing an impact absorbing member, comprising: a second welding step of setting the strip-shaped structure on the outer protective member so as to be inserted between the upper curl portion and the lower curl portion, and obtaining an impact absorbing member by laser welding the upper plate portion to the upper surface portion and the lower plate portion to the lower surface portion.
A method for manufacturing an impact absorbing member according to claim 8 , Staggered positioning holes are further formed in at least one of the upper and lower portions. The positioning hole includes two positioning holes arranged along the cross axis, A method for manufacturing an impact absorbing member, characterized in that the positioning holes are used to position adjacent S-shaped plate materials relative to the S-shaped plate material during the first welding process.

Description

This invention relates to an impact-absorbing member provided on the side of a vehicle body in preparation for a side collision. [Explanation of Terms] - Side sill: A component that corresponds to the threshold of the front and rear doors. Longitudinal axle: A horizontal axle that extends from the front to the rear of the vehicle body. Cross axis: A horizontal axis extending in the direction of the vehicle's width. - Relative movement: Moving one component relative to another component, or moving one component relative to another component.・Three-point bending: A beam is bent when it is supported at two points and a load is applied to one point. To prepare for side collisions, it is desirable to provide impact-absorbing members on the sides of the vehicle body. Various structures have been proposed as impact-absorbing members (see, for example, Patent Document 1 (Figure 2)). Patent Document 1 will be explained based on the following figure. Figure 15 is a perspective view of a conventional shock-absorbing member. As shown in Figure 15, the conventional shock-absorbing member 100 consists of a corrugated lower panel 101 formed by bending the upper and lower sections, a corrugated upper panel 102 formed by bending the upper and lower sections, and an outer case 103 with a roughly U-shaped cross-section that houses these. In the diagram, at the location indicated by A, a portion of the outer case 103 overlaps the upper panel 102. Similarly, a portion of the outer case 103 overlaps the lower panel 101. Due to these weights, the impact-absorbing member 100 becomes heavier. Given the need to reduce the weight of the vehicle body, an increase in the weight of the impact-absorbing member 100 is undesirable. Therefore, shock-absorbing members with a structure that does not require an external case 103 have been proposed (see, for example, Patent Document 2 (Claim 4, Figure 4)). Patent Document 2 discloses a reinforcing member made from an extruded 6000 series or 7000 series aluminum alloy. Although it is explained that the reinforcing member may be made of steel, for example, this document will focus on a reinforcing member made from an extruded aluminum alloy. Aluminum alloys have the advantage of being less dense than steel, but they have the disadvantage of being expensive. In addition, aluminum alloy reinforcing members have the disadvantage of corroding within steel side sills. In other words, the impact-absorbing member disclosed in Patent Document 1 has the disadvantage of being heavy, and the impact-absorbing member disclosed in Patent Document 2 has the disadvantage of being expensive. In recent years, there has been a strong demand for lighter and more cost-effective vehicle bodies. Therefore, there is a need for lightweight and inexpensive shock-absorbing materials that maintain shock absorption performance. U.S. Patent No. 1,0370040Patent No. 7181799 (a) and (b) are diagrams illustrating the method for manufacturing an S-shaped plate material according to the present invention.(a) and (b) are diagrams illustrating a method for manufacturing a strip-shaped structure and shock-absorbing member, and (c) is a view taken along arrow c in (b).(a) and (b) are diagrams illustrating the support structure of the shock-absorbing member.(a) and (b) are diagrams illustrating pole collisions.This graph illustrates the impact energy absorption performance.(a) to (c) are diagrams illustrating the manufacturing method of the outer protective member.(a) to (c) are diagrams illustrating a method for manufacturing shock-absorbing members.This diagram illustrates an example of a modified support structure for a shock-absorbing member.Figures (a) to (c) illustrate further modifications to the support structure of the shock-absorbing member.(a) to (c) are diagrams illustrating different pole collisions.(a) and (b) are diagrams illustrating the positioning holes.(a) and (b) are diagrams illustrating different forms of the inner protective member.This is a flowchart illustrating the method for manufacturing an impact-absorbing member according to the present invention.Figures (a) to (c) are diagrams comparing and examining the impact energy absorption performance.This is a perspective view of a conventional shock-absorbing component. Embodiments of the present invention will be described below with reference to the attached drawings. This invention is suitable for impact-absorbing members provided on the side of a vehicle body to prepare for side collisions.