JP2005059612A - Reinforcing material for automobile excellent in collision characteristic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing material for an automobile excellent in a collision characteristic capable of sufficiently and efficiently absorbing collision energy generated at the time of collision. <P>SOLUTION: A part of a round pipe is indented inward, and a predetermined portion of a rod-like reinforcing material body 1, to which an indentation 2, whose bottom end 1a is positioned near a round pipe inner wall 1b and whose top end is an opening 1c, is partially filled with a resin reinforcing material 10. An enlargement prevention means 11 for preventing the opening 1c from enlarging is provided at a predetermined portion of the rod-like reinforcing material body 1. Also, a predetermined portion of the rod-like reinforcing material body 1 is partially filled with the resin reinforcing material 10, and the enlargement prevention means 11 can be provided for preventing the opening 1c from enlarging. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００２０】
この実施例からも明らかなように、本発明の自動車用補強材は座屈後における補強材断面の崩れが抑制されるためにポンチ押し込み量が大きくなっても耐荷重性の低下が小さく、大きな荷重に耐えることができ衝突エネルギーをより効率よく吸収することが確認できた。これに対して、比較例２に示す丸管からなるものは、ポンチ押し込み量が５０ｍｍを超えると耐荷重性が低下し衝突エネルギーの吸収量が小さいものであった。また、出願人の先願に係る特許文献１に示したもの（比較例１）に比べても、耐荷重性が向上していることが確認できた。
【００２１】
【発明の効果】
以上の説明からも明らかなように、本発明は衝突時に生じる衝突エネルギーを十分かつ効率よく吸収することができ、また重量増加も最小限で軽量化も十分に達成することができ、更には優れた生産性および低廉性も発揮することができるものである。また、補強材の外形状は単純な丸管とほぼ同一であるので、搬送・・取り付け・熱処理等を全て従来の丸管用の設備を利用して行うことができるという利点も有する。
よって本発明は従来の問題点を一掃した衝突特性に優れた自動車用補強材として、産業の発展に寄与するところは極めて大である。
【図面の簡単な説明】
【図１】（ａ）は第１の発明の実施の形態を示す斜視図、（ｂ）はその拡大断面図である。
【図２】（ａ）は第２の発明の実施の形態を示す斜視図、（ｂ）はその拡大断面図である。
【図３】（ａ）は第２の発明の実施の形態を示す斜視図、（ｂ）はその拡大断面図である。
【図４】（ａ）は第３の発明の実施の形態を示す斜視図、（ｂ）はその拡大断面図である。
【図５】その他の実施の形態を示す拡大断面図である。
【図６】本発明の自動車用補強材の適用状態を示す斜視図である。
【図７】第１の発明のその他の例を示す斜視図である。
【図８】曲げ荷重試験を示す説明図である。
【図９】その他の曲げ荷重試験を示す説明図である。
【図１０】ポンチストロークと曲げ荷重の関係を示すグラフである。
【図１１】ポンチストロークと吸収エネルギーの関係を示すグラフである。
【図１２】（ａ）は従来例を示す斜視図、（ｂ）は要部の拡大断面図である。
【符号の説明】
１ 補強材本体
１ａ 下端部
１ｂ 丸管内壁
１ｃ 開口部
２ 凹部
１０ 樹脂補強材
１１ 溶接片
１２ 環状バンド[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automotive reinforcing material having excellent collision characteristics that can sufficiently and efficiently absorb collision energy generated during a collision.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it has been known that a vehicle reinforcing member made of a round steel pipe or a square steel pipe is mounted in a door of an automobile in order to absorb collision energy generated at the time of collision and ensure safety. However, in the case of simple round steel pipes and square steel pipes, the load load decreased due to the flat deformation of the cross section of the steel pipe when a load was applied, and the collision energy generated during a collision could not be efficiently absorbed. .
[0003]
Therefore, as shown in FIG. 12, the applicant forms inwardly curved edge portions 21, 21 facing a part of the tube 20 having a substantially circular cross section, and is continuously integrated with the curved edge portion 21. An automobile reinforcing material excellent in absorbed energy at the time of collision in which a concave portion 22 is formed in the pipe was developed, and a patent application was previously filed as Japanese Patent Application No. 10-78699 (see Patent Document 1). In addition, as shown in Patent Document 2, there has also been proposed one in which a urethane foam material is filled throughout the pipe for the purpose of increasing the average crushing load at the time of collision without reducing the static strength.
[0004]
However, recent safety standards for automobiles tend to be stricter, and development of a reinforcing material capable of absorbing collision energy has been desired more than ever. In addition, there is a demand for weight reduction, and it is necessary to avoid an increase in weight due to the reinforcing material for automobiles, and naturally, it is necessary to have excellent production efficiency and cost performance. Therefore, there is a possibility that it will be difficult to meet future safety standards with the ones shown in Patent Document 1 and Patent Document 2, and the ones shown in Patent Document 2 sufficiently satisfy light weight, productivity, and low cost. There is a risk that it will not be possible.
[0005]
[Patent Document 1] Japanese Patent Laid-Open No. 11-278055 [Patent Document 2] Japanese Patent Laid-Open No. 2002-286066
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above, can efficiently absorb the collision energy generated at the time of collision, can sufficiently achieve weight reduction with minimal increase in weight, Was completed for the purpose of providing an automobile reinforcing material excellent in collision characteristics that can also exhibit excellent productivity and low cost.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a rod-shaped tube in which a part of a round tube is recessed inward, and a lower end is located in the vicinity of the inner wall of the round tube and a recess having an upper end is formed as an opening. According to a first aspect of the present invention, there is provided an automotive reinforcing material having excellent collision characteristics, wherein a resin reinforcing material is partially filled in a predetermined portion of a reinforcing material body. Further, a second aspect of the present invention is an automotive reinforcing material excellent in collision characteristics, characterized in that an expansion preventing means for preventing the opening from being expanded is provided at a predetermined position of the rod-shaped reinforcing material body, Furthermore, a predetermined portion of the rod-shaped reinforcing material body is partially filled with a resin reinforcing material at a portion where the load of the concave portion acts, and an expansion preventing means for preventing the opening from being expanded is provided. A third aspect of the present invention is an automotive reinforcing material having excellent collision characteristics.
[0008]
By setting it as such a structure, it will suppress that a cross section collapse | crumbles with respect to a deformation | transformation of the reinforcing material at the time of a collision, and can absorb a collision energy more efficiently.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1A and 1B show an automotive reinforcing material according to the first invention, in which FIG. 1A is a perspective view and FIG. 1B is an enlarged sectional view thereof. In the figure, reference numeral 1 denotes a rod-shaped reinforcing material body. The reinforcing material body 1 has a round tube partially recessed inward, a lower end portion 1a is positioned in the vicinity of the inner wall 1b of the round tube, and an upper end portion is an opening portion 1c. The concave portion 2 is formed. As shown in FIG. 6, such an automobile reinforcing material is set at various locations for the purpose of improving collision energy absorption at the time of collision of bumpers, doors, roofs, pillars, lockers, and the like. In this case, the reinforcing material body 1 is set so that the line connecting the lower end 1a and the opening 1c is the same as the load direction.
[0010]
When the collision load is applied, the reinforcing material body 1 having the above shape is first elastically deformed to absorb the collision energy. When the elastic limit is exceeded, both side portions 1d and 1d of the reinforcing material body 1 start to buckle. Absorbing the collision energy, and then the lower end 1a and the inner wall 1b of the round tube come into contact with each other to form a stable shape and support the load, thereby suppressing the decrease in load resistance after buckling and increasing the absorption of the collision energy. Can do.
[0011]
And in 1st invention, the resin reinforcement material 10 is partially filled in the predetermined location (any location where the load of a longitudinal direction acts) of the said rod-shaped reinforcement main body 1. As shown in FIG. In other words, the resin reinforcing material 10 is filled and reinforced to suppress the collapse of the cross section of the reinforcing material after the start of buckling, and the collision energy can be absorbed more efficiently without reducing the load resistance.
[0012]
As the resin reinforcing material 10, for example, urethane foam or phenol foam can be used, and the compressive strength is preferably 5 MPa or more and the bending strength is preferably 10 MPa or more. The resin reinforcing material 10 may be partially filled with one piece (see FIG. 1) or two or more pieces (see FIG. 7) with respect to the longitudinal direction of the pipe only at the place where the load acts. Note that the place where the load acts is specified from various data analysis, design conditions, and the like according to the application place such as a bumper and a door. Further, in the conventional round tube, it was extremely difficult to partially fill the resin in the entire longitudinal direction of the tube, but in the present invention, it is arbitrary by injecting the resin from the opening 1c. It can be easily filled in the place.
[0013]
As a material of the reinforcing material, non-ferrous alloys such as hard aluminum and titanium alloy can be used in addition to steel. Steel is most advantageous in terms of cost. When steel is used as a raw material, it is preferable that the yield stress is 500 to 1300 MPa, the tensile strength is 600 to 1600 MPa, and the wall thickness is 1.0 to 3.0 mm. Moreover, when using a steel plate, either a hot-rolled steel plate or a cold-rolled steel plate may be used.
[0014]
As shown in FIG. 5, the resin reinforcing material 10 may have a multilayer structure having a core material 10a made of hard resin and a coating layer 10b made of an adhesive resin covering the outer periphery of the core material 10a. . In this case, the hard core material 10a can suppress the cross-section collapse, which is preferable.
[0015]
The second invention is a rod-shaped reinforcement body 1 in which a part of a round tube is recessed inward, and a lower end 1a is positioned in the vicinity of the inner wall 1b of the round tube and a recess 2 having an upper end portion as an opening 1c is formed. Is provided with a spread prevention means for preventing the opening 1c from spreading.
[0016]
As the spread prevention means, fixing by welding as shown in FIG. 2 or winding with an annular band as shown in FIG. 3 can be performed. In the figure, 11 is a weld piece, and 12 is an annular band made of a pipe, wire, resin, or the like. By taking such spread prevention means, it is possible to prevent the opening 1c from spreading at the place where the load acts, to suppress the collapse of the cross section of the reinforcing material after the start of buckling, and to eliminate the decrease in load resistance. Thus, the collision energy is absorbed more efficiently. Further, the spread prevention means is the same as in the first invention in that one or two or more parts in the longitudinal direction need only be partially provided in the portion where the load of the rod-shaped reinforcing material body 1 acts. is there.
[0017]
The third invention is a rod-shaped reinforcement body 1 in which a part of a round tube is recessed inward, and a lower end 1a is positioned in the vicinity of the inner wall 1b of the round tube and a recess 2 having an upper end as an opening 1c is formed. The resin reinforcing material 10 is partially filled in a predetermined portion of the above and an expansion preventing means for preventing the opening 1c from expanding is provided. That is, by combining the first invention and the second invention, it is possible to further suppress the collapse of the cross section of the reinforcing material after the start of buckling and to absorb the collision energy more efficiently without reducing the load resistance. is there.
[0018]
【Example】
An automotive reinforcing material having a diameter of 38.1 mm as shown in FIGS. 1 (a) and 4 (a) was prepared using STKM980 (100k steel pipe) having a thickness of 2.0 mm. This is placed on fulcrum pillars 30 and 30 having a distance of 600 mm as shown in FIGS. 8 and 9, and the central portion of the reinforcing material is pushed in with punch 31 from above, and the punch stroke amount (mm) and the reinforcing material are The results of measuring the relationship between the bending load (kgf) and the absorbed energy (J) are shown in the graphs of FIGS. 10 and 11 as A: the reinforcing material of FIG. 1 (a) and B: the reinforcing material of FIG. 4 (a). Show. A similar load test was performed on the reinforcing material shown in FIG. 12A as Comparative Example 1 and the reinforcing material made of a simple round tube as Comparative Example 2. Furthermore, Table 1 shows the results of measuring the maximum load and the absorbed energy when the punch stroke amount is 150 mm.
[0019]
[Table 1]

[0020]
As is clear from this example, the automotive reinforcing material of the present invention suppresses the collapse of the cross-section of the reinforcing material after buckling, so that even if the punch push-in amount is large, the load resistance decrease is small and large. It was confirmed that it can withstand the load and absorb the collision energy more efficiently. On the other hand, in the case of the round tube shown in Comparative Example 2, when the punch push-in amount exceeds 50 mm, the load resistance is reduced and the amount of collision energy absorbed is small. Moreover, it has confirmed that the load resistance was improving also compared with what was shown in patent document 1 which concerns on an applicant's prior application (comparative example 1).
[0021]
【The invention's effect】
As is clear from the above description, the present invention can sufficiently and efficiently absorb the collision energy generated at the time of collision, can achieve a sufficient weight reduction with minimal increase in weight, and further excellent. High productivity and low cost can also be achieved. Further, since the outer shape of the reinforcing material is almost the same as that of a simple round tube, there is an advantage that all of the transportation, mounting, heat treatment, etc. can be performed using conventional equipment for round tubes.
Therefore, the present invention contributes greatly to the development of the industry as an automotive reinforcing material having excellent impact characteristics that eliminates the conventional problems.
[Brief description of the drawings]
FIG. 1A is a perspective view showing an embodiment of the first invention, and FIG. 1B is an enlarged sectional view thereof.
2A is a perspective view showing an embodiment of the second invention, and FIG. 2B is an enlarged sectional view thereof.
3A is a perspective view showing an embodiment of the second invention, and FIG. 3B is an enlarged sectional view thereof.
FIG. 4A is a perspective view showing an embodiment of the third invention, and FIG. 4B is an enlarged sectional view thereof.
FIG. 5 is an enlarged cross-sectional view showing another embodiment.
FIG. 6 is a perspective view showing an application state of the automotive reinforcing material of the present invention.
FIG. 7 is a perspective view showing another example of the first invention.
FIG. 8 is an explanatory diagram showing a bending load test.
FIG. 9 is an explanatory view showing another bending load test.
FIG. 10 is a graph showing a relationship between a punch stroke and a bending load.
FIG. 11 is a graph showing the relationship between punch stroke and absorbed energy.
12A is a perspective view showing a conventional example, and FIG. 12B is an enlarged cross-sectional view of a main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement body 1a Lower end 1b Round tube inner wall 1c Opening 2 Recess 10 Resin reinforcement 11 Welding piece 12 Annular band

Claims (6)

Resin reinforcement is partially applied to a predetermined part of the rod-shaped reinforcement body with a part of the round tube recessed inward and a lower end located near the inner wall of the round tube and an opening at the upper end. Reinforcing material for automobiles with excellent impact characteristics characterized by filling The automobile reinforcing material having excellent collision characteristics according to claim 1, wherein the resin reinforcing material has a multilayer structure having a core material made of a hard resin and a coating layer made of an adhesive resin covering an outer periphery of the core material. A part of the round tube is recessed inward, and the opening is opened at a predetermined position of a rod-shaped reinforcing material body in which a lower end is located in the vicinity of the inner wall of the round tube and a recess having an upper end is formed as an opening. A vehicle reinforcing material with excellent collision characteristics, characterized by taking measures to prevent spread. 4. The automobile reinforcing material having excellent collision characteristics according to claim 3, wherein the spread prevention means is fixed by welding or winding with an annular band. Resin reinforcement is partially applied to a predetermined part of the rod-shaped reinforcement body with a part of the round tube recessed inward and a lower end located near the inner wall of the round tube and an opening at the upper end. A reinforcing material for automobiles excellent in collision characteristics, characterized in that it is filled with, and an expansion preventing means for preventing the opening from expanding is provided. The automobile reinforcing material having excellent collision characteristics according to any one of claims 1 to 5, wherein the round tube is formed of a steel plate.

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