JP5454290B2 - Reinforcement structure of automobile collision energy absorbing member - Google Patents

Reinforcement structure of automobile collision energy absorbing member Download PDF

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JP5454290B2
JP5454290B2 JP2010074500A JP2010074500A JP5454290B2 JP 5454290 B2 JP5454290 B2 JP 5454290B2 JP 2010074500 A JP2010074500 A JP 2010074500A JP 2010074500 A JP2010074500 A JP 2010074500A JP 5454290 B2 JP5454290 B2 JP 5454290B2
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collision energy
front side
energy absorbing
side member
absorbing member
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JP2011207263A (en
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裕一 時田
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JFE Steel Corp
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Description

本発明は、自動車の衝突時の衝突エネルギーを吸収してキャビン（客室）への衝撃力を緩和する衝突エネルギー吸収部材（衝撃吸収部材）の性能を向上させるための、自動車の衝突エネルギー吸収部材の補強構造に関するものである。   The present invention relates to a collision energy absorbing member for an automobile for improving the performance of a collision energy absorbing member (impact absorbing member) that absorbs the collision energy at the time of a car collision and relaxes the impact force on the cabin (cabin). The present invention relates to a reinforcing structure.

自動車の衝突時の衝突エネルギーを吸収してキャビンへの衝撃力を緩和することによって乗員の保護を図るためには、例えばエンジンルームやトランクルームといったキャビン以外のスペースを優先的に潰すことが有効である。そこで、自動車の車体の前部、後部あるいは側部等の適切な個所に、衝突エネルギー吸収部材が配置され、衝突時の衝撃荷重が負荷されると、衝突エネルギー吸収部材が軸方向（衝突エネルギー吸収部材の長手方向）へ変形することによって衝突エネルギーを吸収するようになっている。このような衝突エネルギー吸収部材として、フロントサイドメンバー、サイドシル、リアサイドメンバ等が知られている（例えば、特許文献１参照）。   In order to protect passengers by absorbing the collision energy at the time of automobile collision and reducing the impact force on the cabin, it is effective to preferentially crush spaces other than the cabin, such as the engine room and trunk room, for example. . Therefore, when a collision energy absorbing member is disposed at an appropriate location such as the front, rear, or side of an automobile body and an impact load is applied during a collision, the collision energy absorbing member is axially moved (collision energy absorbing). The collision energy is absorbed by being deformed in the longitudinal direction of the member. As such a collision energy absorbing member, a front side member, a side sill, a rear side member, and the like are known (see, for example, Patent Document 1).

このような衝突エネルギー吸収部材について、以下では、フロントサイドメンバーを例にして述べることにする。   Such a collision energy absorbing member will be described below by taking a front side member as an example.

フロントサイドメンバーは、図１（ａ）に示すように、キャビン１０より前方の車体を構成する主要骨格１１であり、クワガタの大顎のように前方に飛び出した二本のフレーム（骨格）で、ここにエンジンやサスペンション等が取り付けられるとともに、衝突時の衝撃（衝突エネルギー）を吸収する役割を与えられている。   As shown in FIG. 1 (a), the front side member is a main skeleton 11 constituting the vehicle body in front of the cabin 10, and has two frames (skeletons) protruding forward like the chin of the stag beetle. Here, an engine, a suspension, and the like are attached, and a role of absorbing impact (collision energy) at the time of collision is given.

なお、フロントサイドメンバー１１は、通常、上部が開放されたＵ字形（コの字形）の横断面を有しているので、ここでは、図１（ｂ）に示すような形状にモデル化したフロントサイドメンバー１２で説明することにする。   The front side member 11 usually has a U-shaped (U-shaped) cross section with an open top, so here, the front side member 11 is modeled in a shape as shown in FIG. The side member 12 will be described.

ここで、自動車の衝突時の衝撃吸収性能（衝突エネルギー吸収性能）については、例えばオフセット前面衝突において、ギャビン１０まわりの変形を抑えるために、衝突による変形を抑え、かつ衝突吸収エネルギーを向上させるには、フロントサイドメンバー１２が長手方向に折れ難くかつ衝突エネルギーの吸収量が大きくなるような構造であることが望ましい。   Here, with regard to impact absorption performance (collision energy absorption performance) at the time of automobile collision, for example, in order to suppress deformation around the Gavin 10 in an offset frontal collision, it is possible to suppress deformation due to collision and improve collision absorption energy. It is desirable that the front side member 12 has a structure in which the front side member 12 is not easily folded in the longitudinal direction and the amount of collision energy absorbed is large.

そこで、このような構造にするために、フロントサイドメンバー１２全体の板厚を厚くしたり、図２（ａ）、（ｂ）に示すように、フロントサイドメンバー１２とほぼ同じ大きさのＵ字形断面を有する補強部材１９をフロントサイドメンバー１２の内側に重合固着したりすることが行われている。   Therefore, in order to make such a structure, the front side member 12 as a whole is made thicker or, as shown in FIGS. 2 (a) and 2 (b), a U-shape having almost the same size as the front side member 12. A reinforcing member 19 having a cross section is superposed and fixed inside the front side member 12.

特開２００８−１５５７４９号公報JP 2008-155749 A

しかしながら、フロントサイドメンバーの衝突エネルギー吸収性能を向上させるために、フロントサイドメンバー全体の板厚を厚くしたり、フロントサイドメンバーとほぼ同じ大きさのＵ字形断面を有する補強部材をフロントサイドメンバーの内側に重合固着したりする方法は、車体の重量が増加し、燃費の観点から好ましくない。   However, in order to improve the collision energy absorption performance of the front side member, the thickness of the entire front side member is increased, or a reinforcing member having a U-shaped cross section approximately the same size as the front side member is provided on the inner side of the front side member. The method of polymerizing and fixing to the resin increases the weight of the vehicle body and is not preferable from the viewpoint of fuel consumption.

本発明は、上記のような事情に鑑みてなされたものであり、自動車のフロントサイドメンバー等の衝突エネルギー吸収部材について、その衝突エネルギー吸収性能を効果的に向上させることができる、自動車の衝突エネルギー吸収部材の補強構造を提供することを目的とするものである。   The present invention has been made in view of the circumstances as described above, and it is possible to effectively improve the collision energy absorption performance of a collision energy absorbing member such as a front side member of an automobile. It aims at providing the reinforcement structure of an absorption member.

上記課題を解決するために、本発明は以下の特徴を有している。   In order to solve the above problems, the present invention has the following features.

［１］自動車の衝突エネルギー吸収部材で、一端が開放されたＵ字形の横断面を有する衝突エネルギー吸収部材において、該衝突エネルギー吸収部材に長手方向の衝撃力が加わった際に当該衝突エネルギー吸収部材の開放端側で最も変形すると予測される個所に対して、金属板材を２枚折りにして作製したクリップ状の補強部材を差し込んで固着したことを特徴とする自動車の衝突エネルギー吸収部材の補強構造。   [1] A collision energy absorbing member of an automobile, which has a U-shaped cross section with one end opened, and when the impact energy in the longitudinal direction is applied to the collision energy absorbing member, the collision energy absorbing member A structure for reinforcing a collision energy absorbing member of an automobile, characterized in that a clip-shaped reinforcing member made by folding a metal plate into two is inserted and fixed to a portion predicted to be most deformed on the open end side of the vehicle .

本発明においては、Ｕ字形の横断面を備えた衝突エネルギー吸収部材について、その衝突エネルギー吸収性能を効果的に向上させることができる。   In the present invention, the collision energy absorbing performance of the collision energy absorbing member having a U-shaped cross section can be effectively improved.

フロントサイドメンバーを示す図である。It is a figure which shows a front side member. 従来技術を示す図である。It is a figure which shows a prior art. 本発明の一実施形態における変形予測シミュレーションを示す図である。It is a figure which shows the deformation | transformation prediction simulation in one Embodiment of this invention. 本発明の一実施形態における補強構造を示す図である。It is a figure which shows the reinforcement structure in one Embodiment of this invention. 本発明の実施例１におけるフロントサイドメンバーを示す図である。It is a figure which shows the front side member in Example 1 of this invention. 本発明の実施例１における変位−断面力曲線を示す図である。It is a figure which shows the displacement-sectional force curve in Example 1 of this invention. 本発明の実施例１における最大断面力を示す図である。It is a figure which shows the largest cross-sectional force in Example 1 of this invention.

本発明の一実施形態を図面に基づいて説明する。なお、ここでも、図１（ｂ）に示したモデル化したフロントサイドメンバー１２を対象にして述べることにする。   An embodiment of the present invention will be described with reference to the drawings. Here again, the modeled front side member 12 shown in FIG. 1B will be described.

まず、本発明の一実施形態においては、フロントサイドメンバー１２に対して長手方向に衝撃力が加わった際に、Ｕ字形横断面の開放端側（ここでは、上端側）で最も変形する個所を有限要素法によるシミュレーション計算によって予測する。   First, in one embodiment of the present invention, when an impact force is applied to the front side member 12 in the longitudinal direction, the most deformed portion on the open end side (here, the upper end side) of the U-shaped cross section is Predicted by simulation calculation using the finite element method.

その一例を図３に示す。ここでは、フロントサイドメンバー１２の材質は強度が５９０ＭＰａ級の鋼であるとし、図３（ａ）に示すように、フロントサイドメンバー１２の後端を固定した状態で、先端部の下端側のＳ点に衝撃力による１ｍ／ｓの強制変位を与えている。   An example is shown in FIG. Here, it is assumed that the material of the front side member 12 is steel having a strength of 590 MPa class, and as shown in FIG. 3A, the S on the lower end side of the front end portion is fixed with the rear end of the front side member 12 fixed. A forced displacement of 1 m / s due to impact force is given to the point.

その結果、図３（ｂ）に、Ｓ点が４０ｍｍ変位した際の塑性ひずみ分布を示すように、開放端側では図中のＰ点において最も塑性ひずみが大きい（最も変形する）ことが分かる。   As a result, as shown in FIG. 3B, the plastic strain distribution when the point S is displaced by 40 mm shows that the plastic strain is the largest (the most deformed) at the point P in the drawing on the open end side.

そこで、開放端側での最大変形個所であるＰ点に対して、図４（ａ）に示すように、鉄鋼やアルミ等の金属板材を２枚折りして作製したクリップ状の補強部材１３を差し込み、スポット溶接で接合する。これにより、図４（ｂ）に示すように、Ｐ点とその近傍がクリップ状補強部材１３で補強された構造となる。   Therefore, as shown in FIG. 4 (a), the clip-shaped reinforcing member 13 produced by folding two metal plates such as steel and aluminum with respect to the point P that is the maximum deformation point on the open end side is provided. Insert and join by spot welding. As a result, as shown in FIG. 4B, the point P and the vicinity thereof are reinforced by the clip-shaped reinforcing member 13.

これによって、開放端側での最大変形個所Ｐ点とその近傍が変形し難くなり、フロントサイドメンバー１２の衝突エネルギーの吸収量が増加する。   As a result, the maximum deformation point P on the open end side and the vicinity thereof are not easily deformed, and the amount of collision energy absorbed by the front side member 12 increases.

しかも、Ｐ点とその近傍のみを覆うようなクリップ状の補強部材１３を用いているので、図２に示したような、フロントサイドメンバー１２とほぼ同じ大きさのＵ字形断面を有する補強部材１９をフロントサイドメンバー１２に重合固着する場合に比べて、ほとんど車体重量の増加にはならない。見方を変えれば、クリップ状の補強部材１３で補強する前と同程度の衝突エネルギー吸収量を有すればよい場合には、フロントサイドメンバー１２の板厚を薄くすることができ、重量を軽減することが可能になる。   In addition, since the clip-shaped reinforcing member 13 that covers only the point P and the vicinity thereof is used, the reinforcing member 19 having a U-shaped cross section substantially the same size as the front side member 12 as shown in FIG. The weight of the vehicle body is hardly increased as compared with the case where the is fixed to the front side member 12 by polymerization. In other words, if it is sufficient to have the same amount of collision energy absorption as before the reinforcement with the clip-shaped reinforcing member 13, the thickness of the front side member 12 can be reduced, and the weight is reduced. It becomes possible.

なお、上記の効果を得るために、フロントサイドメンバー１２の内側と外側にそれぞれ別々の板材（板状の補強部材）を溶接することも考えられるが、この実施形態のように、クリップ状の補強部材１３をフロントサイドメンバー１２に差し込んで溶接する方が、補強部材のハンドリングが容易であるとともに、フロントサイドメンバー１２の内側と外側の溶接個所を同時に溶接することができ、施工性に優れている。   In order to obtain the above effect, it is conceivable to weld separate plate materials (plate-shaped reinforcing members) to the inside and the outside of the front side member 12, respectively. However, as in this embodiment, a clip-shaped reinforcement is used. When the member 13 is inserted into the front side member 12 and is welded, the handling of the reinforcing member is easier, and the inner and outer welded portions of the front side member 12 can be welded simultaneously, and the workability is excellent. .

ちなみに、クリップ状の補強部材１３の寸法については、フロントサイドメンバー１２の寸法やＰ点の予測変形量の大きさ等を考慮して定めればよい。   Incidentally, the size of the clip-shaped reinforcing member 13 may be determined in consideration of the size of the front side member 12, the size of the predicted deformation amount at the point P, and the like.

このようにして、この実施形態においては、衝突エネルギー吸収部材であるフロントサイドメンバー１２の衝突エネルギー吸収性能を効果的に向上させることができる。   Thus, in this embodiment, the collision energy absorption performance of the front side member 12 that is a collision energy absorbing member can be effectively improved.

なお、この実施形態では、フロントサイドメンバーを例にして説明したが、本発明はこれに限定されるものではなく、それ以外のＵ字形横断面を有する衝突エネルギー吸収部材にも適用できることはいうまでもない。   In this embodiment, the front side member has been described as an example. However, the present invention is not limited to this, and can be applied to other collision energy absorbing members having a U-shaped cross section. Nor.

本発明の実施例１として、図５（ａ）に示すような、補強を行う前のフロントサイドメンバー１２を従来例とし、図５（ｂ）に示すような、上記の本発明の一実施形態に基づいて、フロントサイドメンバー１２をクリップ状補強部材１３によって補強した場合を本発明例として、両者の衝突エネルギー吸収性能を比較した。なお、フロントサイドメンバー１２およびクリップ状補強部材１３の材質は、強度が５９０ＭＰａ級の鋼とした。   As Example 1 of the present invention, a front side member 12 before reinforcement as shown in FIG. 5A is used as a conventional example, and one embodiment of the present invention as shown in FIG. 5B is used. Based on the above, the case where the front side member 12 was reinforced by the clip-like reinforcing member 13 was used as an example of the present invention, and the collision energy absorption performance of both was compared. The material of the front side member 12 and the clip-shaped reinforcing member 13 was steel having a strength of 590 MPa.

そして、従来例では、フロントサイドメンバー１２の板厚を２．３ｍｍとし、本発明例では、フロントサイドメンバー１２の板厚を２．１ｍｍ、クリップ状補強部材１３の板厚を１．６ｍｍとした。   In the conventional example, the plate thickness of the front side member 12 is 2.3 mm, and in the present invention example, the plate thickness of the front side member 12 is 2.1 mm, and the plate thickness of the clip-shaped reinforcing member 13 is 1.6 mm. .

図６は、従来例と本発明例について、長手方向に衝撃力が作用したときの変位−断面力曲線を示すものである。そして、その際の最大断面力を比較したものが図７である。   FIG. 6 shows a displacement-sectional force curve when an impact force is applied in the longitudinal direction for the conventional example and the example of the present invention. FIG. 7 shows a comparison of the maximum cross-sectional force at that time.

図６、図７に示すように、本発明例は、従来例に比べて、最大断面力が大きくなっているとともに、衝突エネルギーの吸収量（変位−断面力曲線の下方の面積）も大きくなっている。しかも、重量は３．５％の軽量化がなされている。   As shown in FIGS. 6 and 7, the example of the present invention has a larger maximum cross-sectional force and a larger amount of collision energy absorption (area below the displacement-cross-sectional force curve) than the conventional example. ing. Moreover, the weight has been reduced by 3.5%.

これによって、本発明の有効性を確認することができた。   Thereby, the effectiveness of the present invention could be confirmed.

１０ キャビン（客室）
１１ フロントサイドメンバー
１２ フロントサイドメンバー（モデル化）
１３ クリップ状の補強部材
１９ Ｕ字形断面を有する補強部材 10 cabins (guest rooms)
11 Front side member 12 Front side member (modeling)
13 Clip-shaped reinforcing member 19 Reinforcing member having U-shaped cross section

Claims (1)

自動車の衝突エネルギー吸収部材で、一端が開放されたＵ字形の横断面を有する衝突エネルギー吸収部材において、該衝突エネルギー吸収部材に長手方向の衝撃力が加わった際に当該衝突エネルギー吸収部材の開放端側で最も変形すると予測される個所に対して、金属板材を２枚折りにして作製したクリップ状の補強部材を差し込んで固着したことを特徴とする自動車の衝突エネルギー吸収部材の補強構造。   A collision energy absorbing member of an automobile, which has a U-shaped cross section with one end opened. When an impact force in the longitudinal direction is applied to the collision energy absorbing member, the open end of the collision energy absorbing member A reinforcing structure for a collision energy absorbing member of an automobile, wherein a clip-shaped reinforcing member made by folding a metal plate material into two is inserted and fixed to a portion predicted to be most deformed on the side.
JP2010074500A 2010-03-29 2010-03-29 Reinforcement structure of automobile collision energy absorbing member Expired - Fee Related JP5454290B2 (en)

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