JPH06278458A - Square pipe for automobile door reinforcing material - Google Patents
Square pipe for automobile door reinforcing materialInfo
- Publication number
- JPH06278458A JPH06278458A JP6950693A JP6950693A JPH06278458A JP H06278458 A JPH06278458 A JP H06278458A JP 6950693 A JP6950693 A JP 6950693A JP 6950693 A JP6950693 A JP 6950693A JP H06278458 A JPH06278458 A JP H06278458A
- Authority
- JP
- Japan
- Prior art keywords
- curve
- reinforcing material
- square
- square pipe
- automobile door
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Body Structure For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、側面衝突を受けた際に
乗員を保護するために自動車ドア内部に装備される補強
材（以下、ドア・インパクト・バーと称する）に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing member (hereinafter referred to as a door impact bar) mounted inside a vehicle door to protect an occupant when a side collision occurs.
【０００２】[0002]
【従来の技術】最近の自動車業界では、側面衝突に対す
る安全性を重視しており、輸出用のみならず国内向けの
乗用車にもほぼ全車両のドアにインパクト・バーを装備
している。一方、環境問題の観点から自動車の燃費向上
が指向されており、車両の軽量化が大きな課題となって
きている。而して、ドア・インパクト・バーも可及的に
軽量化することが望まれている。ドア・インパクト・バ
ーの軽量化という観点からすると、従来の、たとえば特
開昭５６−５０８１３号公報に開示されているような、
板材よりも管材の方が有利である処から、最近ではドア
・インパクト・バーとして鋼管が多用にされるようにな
ってきている。さらに、たとえば特開平１−２０５０３
２号公報に開示されているように、鋼管を高強度化し、
薄肉化することが企図されている。また、最近では丸断
面よりも断面二次モーメント的に有利で、かつ断面偏平
の起こしにくい角管も開発されている。2. Description of the Related Art In the recent automobile industry, importance is attached to safety against side collision, and almost all doors of passenger cars for domestic as well as for export are equipped with impact bars. On the other hand, from the viewpoint of environmental problems, improvement of fuel efficiency of automobiles is aimed, and weight reduction of vehicles has become a major issue. Therefore, it is desired to reduce the weight of the door impact bar as much as possible. From the viewpoint of reducing the weight of the door impact bar, a conventional one, such as that disclosed in Japanese Patent Laid-Open No. 56-50813,
Recently, steel pipe has been widely used as a door impact bar because the pipe material is more advantageous than the plate material. Furthermore, for example, Japanese Patent Laid-Open No. 1-20503
As disclosed in Japanese Patent No.
It is intended to be thin. Further, recently, a square tube has been developed which is more advantageous in terms of second moment of area than a round cross section and is less likely to cause a flat cross section.
【０００３】[0003]
【発明が解決しようとする課題】上記の最後に述べた角
管は、断面二次モーメント的には有利で、かつ断面偏平
も起こしにくいが、コーナー部で応力が集中し、割れが
発生し易いという問題がある。そこで一般にはコーナー
部にＲを設け、応力集中を緩和する方法が採られてい
る。しかし、内外面ともに同様なＲを設けると、断面偏
平を起こしにくいという角管の効果が薄れ、曲げ強度が
減少してしまうという問題が生じていた。The last-mentioned square tube is advantageous in terms of the moment of inertia of section and is less likely to cause flatness in section, but stress concentrates at the corners and cracks easily occur. There is a problem. Therefore, in general, a method is adopted in which R is provided at the corner portion to reduce stress concentration. However, when the same R is provided on both the inner and outer surfaces, there is a problem that the effect of the rectangular tube, which is less likely to cause a flattened cross section, is diminished and the bending strength is reduced.
【０００４】[0004]
【課題を解決するための手段】本発明の要旨は、コーナ
ー部の外面にはＲを設けないか或いは肉厚未満の大きさ
のＲを設け、内面には外面のＲより大きいＲを設けてあ
ることを特徴とする自動車ドア補強材用角管にある。SUMMARY OF THE INVENTION The gist of the present invention is to provide no R on the outer surface of the corner or to provide R having a size less than the wall thickness and to provide R larger than R on the outer surface on the inner surface. It is in a square tube for automobile door reinforcement, which is characterized in that
【０００５】以下本発明の詳細を説明する。一般にドア
・インパクト・バー１は、図２に示すような半円形のポ
ンチ２を用いた３点曲げ試験で描かれる曲げ荷重−変位
曲線で評価される。一般に角管を本試験で曲げた場合
（図３（ａ））、丸管（図３（ｂ））と異なり、荷重方
向に平行な両側面の端に直接荷重が負荷されるため断面
偏平を起こしにくい構造になっている。しかし、このコ
ーナー部の外面に肉厚以上の大きさのＲを設ける（図３
（ｃ））と両側面の端に直接負荷されず、中央周辺のみ
が押されるため、両側面も外側に広がり、結果として、
断面偏平が起こり易くなる。従って、コーナー部外面で
は、できればＲを設けない方が好ましく、製造上やむを
得ずＲが設けられてしまう場合にも肉厚以上の大きさの
Ｒは設けない方が有利である。The present invention will be described in detail below. Generally, the door impact bar 1 is evaluated by a bending load-displacement curve drawn by a three-point bending test using a semicircular punch 2 as shown in FIG. Generally, when a square tube is bent in this test (Fig. 3 (a)), unlike the round tube (Fig. 3 (b)), a load is directly applied to the ends of both side faces parallel to the load direction, so the cross-section flatness is reduced. It has a structure that is hard to wake up. However, the outer surface of this corner portion is provided with R having a size larger than the wall thickness (see FIG. 3).
(C)) Since the edges of both side surfaces are not directly loaded and only the center periphery is pushed, both side surfaces also spread outward, and as a result,
A flattened cross section is likely to occur. Therefore, it is preferable not to provide R on the outer surface of the corner portion if possible, and it is advantageous not to provide R having a size larger than the wall thickness even if R is unavoidable in manufacturing.
【０００６】一方、角管コーナー部の内面にＲを設けな
いと、コーナー内面に応力が集中し、割れ易くなる（図
３（ｄ））。従って、内面のＲは大きい方が有利であ
る。以上より、コーナー部の外面にはＲを設けないか或
いは肉厚未満の大きさのＲを設け、内面には外面のＲよ
り大きいＲを設けてある角管（図１）が、ドア・インパ
クト・バー用角管として最適である。On the other hand, if R is not provided on the inner surface of the corner portion of the square tube, stress concentrates on the inner surface of the corner, and cracks easily occur (FIG. 3 (d)). Therefore, it is advantageous that the R of the inner surface is large. From the above, a square tube (Fig. 1) in which R is not provided on the outer surface of the corner portion or R having a size less than the wall thickness and R larger than R of the outer surface is provided on the inner surface is a door impact. -Ideal as a square tube for bars.
【０００７】[0007]
【実施例】幅３１．８mm、肉厚２．０mmで種々の内外面
のＲを有する１５０Kgf/mm2 級角鋼管を用いて、図２に
示す３点曲げ試験を実施した。各角鋼管の内外面Ｒの大
きさを以下の表１に示す。Example A three-point bending test shown in FIG. 2 was carried out using a 150 Kgf / mm 2 grade square steel tube having a width of 31.8 mm, a wall thickness of 2.0 mm and various Rs on the inner and outer surfaces. The sizes of the inner and outer surfaces R of each square steel pipe are shown in Table 1 below.
【０００８】[0008]
【表１】 上記の試験の結果である曲げ荷重−変位曲線を図４に示
す。本図より、外面Ｒは肉厚未満の大きさで、内面Ｒは
外面のＲより大きい本発明品（Ａ）が比較例（Ｂ）
（Ｃ）に比較して最も最大荷重が高く、かつ座屈時の変
位が大きいことが判る。[Table 1] The bending load-displacement curve which is the result of the above test is shown in FIG. From this figure, the outer surface R is smaller than the wall thickness, and the inner surface R is larger than the outer surface R. The product (A) of the present invention is a comparative example (B).
It can be seen that the maximum load is highest and the displacement during buckling is large as compared with (C).
【０００９】なお、上記の実施例では、同一重量の角鋼
管で比較したが、同一最大曲げ荷重を有する角鋼管で比
較した場合、本発明品は従来の角管と比較して軽量化が
可能になる。但し、本発明は電縫鋼管等の丸管から角管
を製造する場合、本発明のように外面と内面で異なるＲ
を設けるのは困難を伴うが、ドア・インパクト・バー
は、最近では軽量化の目的よりアルミ化も検討されつつ
あり、押し出しで成形されるアルミ管では、本発明のよ
うな形状でも極めて容易に製造可能である。In the above embodiment, the square steel pipes having the same weight are compared, but when compared with the square steel pipes having the same maximum bending load, the product of the present invention can be made lighter than the conventional square pipes. become. However, in the present invention, when manufacturing a square pipe from a round pipe such as an electric resistance welded steel pipe, the outer surface and the inner surface are different from each other as in the present invention.
Although it is difficult to provide the door impact bar, recently, for the purpose of reducing the weight, aluminum is being considered for the door impact bar, and it is extremely easy to use an aluminum tube formed by extrusion even with the shape of the present invention. It can be manufactured.
【００１０】[0010]
【発明の効果】以上の本発明の自動車ドア補強材用角管
は、曲げ負荷時に断面が偏平しにくく、かつコーナー部
で割れが生じにくく、しかも同一最大曲げ荷重を有する
従来の角管よりも軽量にすることが可能になる。また、
本発明は、アルミ管のように押し出しで成形される材料
では特に有効である。EFFECTS OF THE INVENTION The square tube for a vehicle door reinforcing material of the present invention described above is less likely to have a flat cross section at the time of bending load, is less likely to be cracked at the corner portion, and is more than a conventional square tube having the same maximum bending load. It becomes possible to reduce the weight. Also,
The present invention is particularly effective for a material formed by extrusion such as an aluminum tube.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明で得られた自動車ドア補強材用角管の説
明図である。FIG. 1 is an explanatory view of a square tube for an automobile door reinforcing material obtained by the present invention.
【図２】３点曲げ試験の説明図である。FIG. 2 is an explanatory diagram of a 3-point bending test.
【図３】従来角管の曲げ時の特性の説明図である。FIG. 3 is an explanatory diagram of characteristics when a conventional rectangular tube is bent.
【図４】３点曲げ試験で得られる曲げ荷重−変位曲線図
である。FIG. 4 is a bending load-displacement curve diagram obtained by a three-point bending test.
１ ドア・インパクト・バー ２ ポンチ ３ 支点 1 door impact bar 2 punch 3 fulcrum
Claims (1)
いは肉厚未満の大きさのＲを設け、内面には外面のＲよ
り大きいＲを設けてあることを特徴とする自動車ドア補
強材用角管。1. An automobile door reinforcing material, characterized in that no R is provided on the outer surface of the corner portion, or R having a size less than the wall thickness is provided, and R on the inner surface is provided larger than R of the outer surface. Square tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6950693A JPH06278458A (en) | 1993-03-29 | 1993-03-29 | Square pipe for automobile door reinforcing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6950693A JPH06278458A (en) | 1993-03-29 | 1993-03-29 | Square pipe for automobile door reinforcing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06278458A true JPH06278458A (en) | 1994-10-04 |
Family
ID=13404700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6950693A Withdrawn JPH06278458A (en) | 1993-03-29 | 1993-03-29 | Square pipe for automobile door reinforcing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06278458A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100619295B1 (en) * | 2003-10-03 | 2006-09-12 | 신닛뽄세이테쯔 카부시키카이샤 | Automobile strength member |
| JP2016182921A (en) * | 2015-03-26 | 2016-10-20 | 株式会社神戸製鋼所 | Beam structure member |
| JPWO2016199336A1 (en) * | 2015-06-11 | 2018-03-01 | パナソニックＩｐマネジメント株式会社 | Solar cell module frame and solar cell module |
-
1993
- 1993-03-29 JP JP6950693A patent/JPH06278458A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100619295B1 (en) * | 2003-10-03 | 2006-09-12 | 신닛뽄세이테쯔 카부시키카이샤 | Automobile strength member |
| US7648191B2 (en) | 2003-10-03 | 2010-01-19 | Nippon Steel Corporation | Automobile strength member |
| JP2016182921A (en) * | 2015-03-26 | 2016-10-20 | 株式会社神戸製鋼所 | Beam structure member |
| JPWO2016199336A1 (en) * | 2015-06-11 | 2018-03-01 | パナソニックＩｐマネジメント株式会社 | Solar cell module frame and solar cell module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000530 |