JP7001075B2 - Reinforcement method for structural members for automobiles and hollow members for automobiles - Google Patents

Reinforcement method for structural members for automobiles and hollow members for automobiles Download PDF

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JP7001075B2
JP7001075B2 JP2019033077A JP2019033077A JP7001075B2 JP 7001075 B2 JP7001075 B2 JP 7001075B2 JP 2019033077 A JP2019033077 A JP 2019033077A JP 2019033077 A JP2019033077 A JP 2019033077A JP 7001075 B2 JP7001075 B2 JP 7001075B2
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side wall
pair
plate portion
top plate
wall portions
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JP2020138558A (en
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貴之 二塚
智宏 堺谷
健太郎 佐藤
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JFE Steel Corp
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Description

本発明は、天板部と側壁部と底板部とで閉断面形状を構成する自動車用の構造部材(中空部材)に係る。特に、本発明は、天板部と底板部の対向方向に沿った方向から入力される衝突荷重による曲げ変形に対し、耐衝突性能を有する構造部材を提供する技術である。 The present invention relates to a structural member (hollow member) for an automobile, in which a top plate portion, a side wall portion, and a bottom plate portion form a closed cross-sectional shape. In particular, the present invention is a technique for providing a structural member having collision resistance against bending deformation due to a collision load input from a direction along the opposite direction of the top plate portion and the bottom plate portion.

近年、自動車分野では、乗員保護の観点から衝突安全基準の厳格化が進められており、高強度鋼の適用拡大や衝突安全性能に優れる車両開発が強く求められている。
ここで、衝突の形態としては、軸圧壊する衝突形態と、曲げ変形する衝突形態とがある。軸圧壊する衝突形態では、自動車前面から入力される衝突荷重を受けるクラッシュボックスやフロントサイドメンバのように、部材の長手方向が衝突方向と一致して軸圧壊が発生する。曲げ変形する衝突形態では、側面衝突におけるBピラーやサイドシルのように、構造部材の側面に衝突荷重が負荷されて部材が曲げ変形する。両方の形態は、いずれも、部材が座屈変形することで衝突エネルギーを吸収し、耐衝突性能を発揮する。
In recent years, in the automobile field, stricter collision safety standards have been promoted from the viewpoint of occupant protection, and there is a strong demand for expanding the application of high-strength steel and developing vehicles with excellent collision safety performance.
Here, as the form of collision, there are a collision form in which the shaft is crushed and a collision form in which bending deformation occurs. In the collision mode in which the shaft is crushed, the longitudinal direction of the member coincides with the collision direction and the shaft crush occurs, such as a crash box or a front side member that receives a collision load input from the front surface of the automobile. In the collision mode in which bending deformation occurs, a collision load is applied to the side surface of the structural member and the member bends and deforms, as in the case of the B pillar and the side sill in a side collision. In both forms, the member absorbs collision energy by buckling and deforming, and exhibits collision resistance.

耐衝突性能を向上させる技術の1つとして、補強部材を取り付けることで構造部材の強度を向上させる技術が提案されている。例えば、特許文献1には、構造部材の内部に複数個のバルクヘッドを設けると共にバルクヘッドの間に補強材を設けることで、変形を抑制する技術が挙げられている。また、特許文献2には、構造部材の形状に沿った断面がL字状あるいはコの字状の補強部品を、構造部材の内側あるいは外側に配置することで、構造部材の稜線を中心に底板部と側壁部を補強する技術が挙げられている。さらに特許文献3、4には構造部材の内側に発泡材を充填する、あるいは発砲充填した補強部材を衝突時に変形しやすい屈曲部に配置することで、変形を抑制する技術が挙げられている。 As one of the techniques for improving the collision resistance performance, a technique for improving the strength of the structural member by attaching a reinforcing member has been proposed. For example, Patent Document 1 describes a technique for suppressing deformation by providing a plurality of bulkheads inside a structural member and providing a reinforcing material between the bulkheads. Further, in Patent Document 2, a reinforcing part having an L-shaped or U-shaped cross section along the shape of the structural member is arranged inside or outside the structural member, so that the bottom plate is centered on the ridgeline of the structural member. Techniques for reinforcing the portion and the side wall portion are mentioned. Further, Patent Documents 3 and 4 describe a technique for suppressing deformation by filling the inside of a structural member with a foaming material or arranging a reinforcing member filled with foam at a bent portion that is easily deformed at the time of collision.

特開平9-20267号公報Japanese Unexamined Patent Publication No. 9-20267 WO2017/030191号WO2017 / 030191 特開2002-36413号公報Japanese Unexamined Patent Publication No. 2002-36413 特開2017-159896号公報Japanese Unexamined Patent Publication No. 2017-159896

しかしながら、構造部材に対し、単純に補強部材を取り付けた場合、耐衝突性能は向上するが、部品点数の増加を招いて必要以上に重量が増加したり、金型の増加を招いたりして、コスト面の課題がある。
またこのような方法では、特に、広い領域を補強部材で補強するにつれて、重量増加が顕著となる。また耐衝突性能の観点から、構造部材や補強部材には高強度鋼板が適用される傾向にあるため、寸法精度の確保や溶接性の低下など、生産性やコスト面に課題がある。
However, if a reinforcing member is simply attached to the structural member, the collision resistance is improved, but the number of parts increases, the weight increases more than necessary, and the number of molds increases. There is a cost issue.
Further, in such a method, the weight increase becomes remarkable particularly as the wide area is reinforced with the reinforcing member. Further, from the viewpoint of collision resistance, high-strength steel plates tend to be applied to structural members and reinforcing members, so that there are problems in terms of productivity and cost, such as ensuring dimensional accuracy and reducing weldability.

一方で、発泡充填材による補強は、生産工程の複雑化が懸念され、リサイクル性の観点からも課題がある。また、部分的に発砲充填部材を取り付ける場合、部材取付けに接着が用いられるが、変形途中でのはく離や経年劣化などの接着性に課題があり、安定した耐衝突性能の確保が困難であると考えられる。
本発明は、上記のような点に着目してなされたもので、補強による重量の増加を抑えつつ、簡便に耐衝突性能を向上させることが可能な自動車用構造部材を提供することを目的とする。
On the other hand, reinforcement with a foam filler has a problem from the viewpoint of recyclability because there is a concern that the production process will be complicated. In addition, when partially attaching the foam filling member, adhesion is used to attach the member, but there are problems with adhesion such as peeling and deterioration over time during deformation, and it is difficult to secure stable collision resistance. Conceivable.
The present invention has been made focusing on the above points, and an object of the present invention is to provide a structural member for an automobile capable of easily improving collision resistance while suppressing an increase in weight due to reinforcement. do.

課題を解決するために、本発明の一態様は、天板部、上記天板部の幅方向両側にそれぞれ連続する一対の側壁部、及び上記天板部に対向配置した底板部で閉断面形状を構成する中空部材と、上記一対の側壁部の各外壁面にそれぞれ当接する一対の板材と、上記一対の板材を連結して上記一対の板材間の距離が広がることを拘束する連結部材と、を備えることを要旨とする。 In order to solve the problem, one aspect of the present invention has a closed cross-sectional shape with a top plate portion, a pair of side wall portions continuous on both sides of the top plate portion in the width direction, and a bottom plate portion arranged facing the top plate portion. A hollow member constituting the above, a pair of plate materials that abut on each outer wall surface of the pair of side wall portions, and a connecting member that connects the pair of plate materials and restrains the distance between the pair of plate materials from increasing. The gist is to prepare for.

また、本発明の他の態様は、天板部、上記天板部の幅方向両側にそれぞれ連続する一対の側壁部、及び上記天板部に対向配置した底板部で閉断面形状を構成する自動車用中空部材の補強方法であって、軸方向両端部の少なくとも一方の端部に雄ねじ部が形成された軸部材と、上記軸部材の雄ねじ部に螺合可能なナット部材を用意し、上記一対の側壁部に上記軸部材が貫通可能な貫通穴を開口し、その対をなす貫通穴に上記軸部材が貫通するように配置すると共に、側壁部から突出した上記軸部材の端部に対して、板材としてのワッシャ部材を取り付けると共に、ナット部材を螺合し締め付けることを要旨とする。 In addition, another aspect of the present invention is an automobile in which a top plate portion, a pair of side wall portions continuous on both sides in the width direction of the top plate portion, and a bottom plate portion arranged facing the top plate portion form a closed cross-sectional shape. A shaft member having a male screw portion formed at at least one end of both ends in the axial direction and a nut member screwable to the male screw portion of the shaft member are prepared as a method for reinforcing the hollow member. A through hole through which the shaft member can penetrate is opened in the side wall portion, and the shaft member is arranged so as to penetrate through the pair of through holes, and the end portion of the shaft member protruding from the side wall portion. The gist is to attach the washer member as a plate material and screw and tighten the nut member.

本発明の態様によれば、一対の側壁部に当接する一対の板材を連結部材で連結させることで、天板部と底板部の対向方向に入力される衝突荷重による一対の側壁部の外方への膨らみ(座屈)を少ない補強部材で抑制することが可能となる。すなわち、本発明の態様によれば、衝突時の部材断面変形を効果的に抑制し、特に曲げ変形に対する最大荷重を向上させることが可能となる。 According to the aspect of the present invention, by connecting a pair of plate members in contact with the pair of side wall portions with a connecting member, the outer side of the pair of side wall portions due to the collision load input in the opposite direction of the top plate portion and the bottom plate portion. It is possible to suppress the swelling (buckling) with a small amount of reinforcing member. That is, according to the aspect of the present invention, it is possible to effectively suppress the member cross-sectional deformation at the time of collision, and to improve the maximum load particularly for bending deformation.

本発明に基づく実施形態に係る中空部材を示す斜視図である。It is a perspective view which shows the hollow member which concerns on embodiment based on this invention. 本発明に基づく実施形態に係る中空部材の断面図である。It is sectional drawing of the hollow member which concerns on embodiment based on this invention. 本実施形態における補強部材の配置を説明する図である。It is a figure explaining the arrangement of the reinforcing member in this embodiment. 本発明に基づく実施形態に係る板材を構成するワッシャ部材を示す斜視図である。It is a perspective view which shows the washer member which constitutes the plate material which concerns on embodiment based on this invention. 本実施形態における補強部材の別例を示す図である。It is a figure which shows another example of the reinforcing member in this embodiment. 実施例における3点曲げ解析条件を説明する側面図である。It is a side view explaining the three-point bending analysis condition in an Example. 実施例における3点曲げ解析条件を説明する斜視図である。It is a perspective view explaining the three-point bending analysis condition in an Example. 荷重負荷のストローク(押込み量)と荷重との関係を示す図である。It is a figure which shows the relationship between the stroke (pushing amount) of a load, and a load. 天板部に底板部に向けて荷重を負荷した際の挙動を示す図である。It is a figure which shows the behavior when the load is applied to the top plate part toward the bottom plate part. 実施例1における天板部に負荷する荷重とストロークとの関係を示す図である。It is a figure which shows the relationship between the load which is applied to the top plate part and the stroke in Example 1. FIG. 実施例2における板材(プレート)の配置条件を説明する側面図である。It is a side view explaining the arrangement condition of the plate material (plate) in Example 2. FIG. 実施例2のNo.5で使用するワッシャ部材(板材)を示す斜視図である。Example 2 No. It is a perspective view which shows the washer member (plate material) used in 5. 荷重負荷の際の、x軸とy軸とを示す側面図である。It is a side view which shows the x-axis and the y-axis at the time of a load. 変形エリアの解析を示す側面図であり、(a)は50mmの押込み(ストローク)による変形の量(断面開き量)の状態を示し、(b)はストローク=0の形状に変形エリアをトレースした図である。It is a side view showing the analysis of the deformation area, (a) shows the state of the amount of deformation (cross-sectional opening amount) by pushing (stroke) of 50 mm, and (b) traces the deformation area into the shape of stroke = 0. It is a figure.

次に、本発明の実施形態について図面を参照して説明する。
本実施形態では、天板部、天板部の幅方向両側にそれぞれ連続する一対の側壁部、及び天板部に対向配置した底板部で閉断面形状を構成する中空部材を、補強すべき自動車用構造部材(以下、単に構造部材と記載する。)とする。
Next, an embodiment of the present invention will be described with reference to the drawings.
In the present embodiment, an automobile to reinforce a hollow member having a closed cross-sectional shape with a top plate portion, a pair of side wall portions continuous on both sides of the top plate portion in the width direction, and a bottom plate portion arranged facing the top plate portion. Structural member (hereinafter, simply referred to as structural member).

本実施形態の構造部材1は、例えば、図1及び図2に示すように、天板部10Aと、天板部10Aの幅方向両側にそれぞれ連続する一対の側壁部10Bとを有するハット断面部材10と、そのハット断面部材10の開口を閉塞する底板部11とで構成される。この例では、底板部11は、天板部10Aに対向配置し、底板部11の幅方向両側がそれぞれ、一対の側壁部10Bの各端部に設けられるフランジ10Baに溶接にて結合されている。
なお、図1~図4には、実施例における部材の寸法を併記しているが、この寸法は、本発明を何ら限定するものではない。
As shown in FIGS. 1 and 2, for example, the structural member 1 of the present embodiment is a hat cross-sectional member having a top plate portion 10A and a pair of side wall portions 10B continuous on both sides of the top plate portion 10A in the width direction. It is composed of 10 and a bottom plate portion 11 that closes the opening of the hat cross-sectional member 10. In this example, the bottom plate portion 11 is arranged to face the top plate portion 10A, and both sides of the bottom plate portion 11 in the width direction are welded to flanges 10Ba provided at each end of the pair of side wall portions 10B. ..
It should be noted that although the dimensions of the members in the embodiments are also shown in FIGS. 1 to 4, the dimensions do not limit the present invention in any way.

本実施形態では、上記のような形状の構造部材1に対し補強部材を設けることで、特に、曲げ変形する衝突形態について、構造部材1の耐衝撃性能を向上させる。
本実施形態の補強部材は、図3のように、各側壁部10Bに当接する一対の板材22間の距離を連結部材20,21で拘束することで、天板部10A又は底板部11への衝突荷重の入力に対し、対向する一対の側壁部10Bの面外方向への膨らみ(座屈)を抑制する。すなわち、本実施形態の補強部材を用いることで、衝突時の部材断面変形を効果的に抑制し、特に曲げ変形における最大荷重を向上させることが可能となる。
本実施形態の補強部材は、図3に示すように、一対の側壁部10Bの各外壁面にそれぞれ当接する一対の板材22と、天板部10Aの幅方向に延在して一対の板材22を連結する連結部材と、からなる。
In the present embodiment, by providing the reinforcing member to the structural member 1 having the above-mentioned shape, the impact resistance performance of the structural member 1 is improved particularly in the case of a collision form in which the structural member 1 is bent and deformed.
As shown in FIG. 3, the reinforcing member of the present embodiment can be attached to the top plate portion 10A or the bottom plate portion 11 by restraining the distance between the pair of plate members 22 that abut on each side wall portion 10B with the connecting members 20 and 21. In response to the input of the collision load, the pair of side wall portions 10B facing each other suppresses swelling (buckling) in the out-of-plane direction. That is, by using the reinforcing member of the present embodiment, it is possible to effectively suppress the member cross-sectional deformation at the time of collision, and to improve the maximum load particularly in the bending deformation.
As shown in FIG. 3, the reinforcing member of the present embodiment includes a pair of plate members 22 that are in contact with each outer wall surface of the pair of side wall portions 10B, and a pair of plate members 22 that extend in the width direction of the top plate portion 10A. It consists of a connecting member that connects the above.

図3に示す例では、連結部材は、軸部材20(ネジ棒)と2個のナット部材21とからなり、一対の板材22は、それぞれワッシャ部材から構成される。
軸部材20は、一対の側壁部10B間の距離よりも長く、軸方向両端部にそれぞれ雄ねじ部20aが形成されている。雄ねじ部20aは、例えば側壁部10Bよりも内側の位置から先端に向けて形成されている。
ここで、板材22は、側壁部10Bの外面に当接する面積が、板材22に当接するナット部材21の面積よりも大きいほうが好ましい。また、ナット部材21が大きい場合には、ナット部材21自体を板材22の代わりとしても良い。
In the example shown in FIG. 3, the connecting member is composed of a shaft member 20 (screw rod) and two nut members 21, and each of the pair of plate members 22 is composed of a washer member.
The shaft member 20 is longer than the distance between the pair of side wall portions 10B, and male screw portions 20a are formed at both ends in the axial direction. The male screw portion 20a is formed, for example, from a position inside the side wall portion 10B toward the tip end.
Here, it is preferable that the area of the plate material 22 in contact with the outer surface of the side wall portion 10B is larger than the area of the nut member 21 in contact with the plate material 22. Further, when the nut member 21 is large, the nut member 21 itself may be used as a substitute for the plate member 22.

また、対向する一対の側壁部10Bに、軸部材20を貫通可能な貫通穴10Bbが同軸に開口している。
そして、軸部材20は、一対の側壁部10Bに開口した貫通穴10Bbにそれぞれ端部を貫通させるように配置される。なお、軸部材20は、例えば、一方の側壁部側の貫通穴10Bbから通すことで簡単に取り付けることができる。
そして、各側壁部10Bから外方に突出した各軸部材20の端部(雄ねじ部20a)に対し、ワッシャ部材22が取り付けられていると共に、ナット部材21が螺合している。そして、ナット部材21を締め付けることで、各板材を構成するワッシャ部材22は側壁部10Bの外面に当接する。ナット部材21からはみ出す軸部材20の端部の部分は、予め切断、若しくはナット部材21を締め込んだ後に切断すればよい。
Further, a through hole 10Bb capable of penetrating the shaft member 20 is coaxially opened in the pair of side wall portions 10B facing each other.
Then, the shaft member 20 is arranged so as to penetrate the end portions of the through holes 10Bb opened in the pair of side wall portions 10B. The shaft member 20 can be easily attached, for example, by passing it through a through hole 10Bb on one side wall portion side.
A washer member 22 is attached to an end portion (male screw portion 20a) of each shaft member 20 protruding outward from each side wall portion 10B, and a nut member 21 is screwed into the end portion (male screw portion 20a). Then, by tightening the nut member 21, the washer member 22 constituting each plate material comes into contact with the outer surface of the side wall portion 10B. The end portion of the shaft member 20 protruding from the nut member 21 may be cut in advance or after the nut member 21 is tightened.

ワッシャ部材22における側壁部10Bに対向する面は、当該側壁部10Bに全面が接触するように構成する。このため、図4に示すように、天板部10Aに対する側壁部10Bの傾き角に応じた傾斜角θを、ワッシャ部材22の側壁部10Bに対向する面に付与する。
上記説明では、軸部材20の両端部に、それぞれワッシャ部材22とナット部材21を取り付け、ナット部材21を締め込む構成で説明したが、補強部材の構成はこれに限定されない。
例えば、軸部材20を長軸のボルトから構成して、ボルトの頭を、一方のナット部材21の代わりとしても良い。
The surface of the washer member 22 facing the side wall portion 10B is configured so that the entire surface of the washer member 22 is in contact with the side wall portion 10B. Therefore, as shown in FIG. 4, an inclination angle θ corresponding to the inclination angle of the side wall portion 10B with respect to the top plate portion 10A is applied to the surface of the washer member 22 facing the side wall portion 10B.
In the above description, the washer member 22 and the nut member 21 are attached to both ends of the shaft member 20, respectively, and the nut member 21 is tightened, but the configuration of the reinforcing member is not limited to this.
For example, the shaft member 20 may be composed of a long-axis bolt, and the head of the bolt may be used instead of one of the nut members 21.

また、図5に示すように、軸部材20の一端部に片方のワッシャ部材22と同形状の板材20Aが予め固定されている軸部材20を使用しても良い。また、左右のナット部材21のうちの一方のナット部材が、ワッシャ部材22に固定又は一体に形成されていても良い。
また、図3では、構造部材1の長手方向(延在方向)の一カ所だけに上記構成の補強部材を設ける場合が例示されているが、これに限定されない。構造部材1の長手方向に沿って、複数の箇所に、上記構成の補強部材を設けても良い。
なお、軸部材20は、天板部10Aの幅方向に軸を向けて配置されるが、平面視で、構造部材1の長手方向と直交していなくても良い。
Further, as shown in FIG. 5, a shaft member 20 may be used in which a plate material 20A having the same shape as that of one washer member 22 is previously fixed to one end of the shaft member 20. Further, one of the left and right nut members 21 may be fixedly or integrally formed to the washer member 22.
Further, FIG. 3 illustrates a case where the reinforcing member having the above configuration is provided only at one place in the longitudinal direction (extending direction) of the structural member 1, but the present invention is not limited to this. Reinforcing members having the above configuration may be provided at a plurality of locations along the longitudinal direction of the structural member 1.
The shaft member 20 is arranged so that the axis is directed in the width direction of the top plate portion 10A, but it does not have to be orthogonal to the longitudinal direction of the structural member 1 in a plan view.

補強部材は、構造部材1の長手方向と交差する方向(例えば垂直方向)で、衝突荷重が負荷される可能性が高いと推定される位置の近傍に設けることが好ましい。
一対の板材22(ワッシャ部材22)を設ける位置は、例えば、天板部10Aと底板部11との対向方向に沿って衝突荷重が負荷される可能性が高いと推定される天板部10A又は底板部11における面位置と、一対の側壁部10Bの対向方向からみて、板材22の一部が上下(天板部10Aと底板部11の対向方向)で重なるような位置に配置する。
又は、一対の板材22を設ける位置は、例えば、天板部10Aと底板部11との対向方向に向かう衝突荷重が負荷される可能性が高いと推定される天板部10A又は底板部11における面位置に、予め設定した衝突荷重を負荷した際に側壁部10Bが変形する変形領域(図14(b)のAREAを参照)に、板材22の中心位置(軸部材20の位置)が位置するように配置する。
The reinforcing member is preferably provided in a direction intersecting the longitudinal direction of the structural member 1 (for example, in the vertical direction) in the vicinity of a position where it is presumed that a collision load is likely to be applied.
The position where the pair of plate members 22 (washer members 22) are provided is, for example, the top plate portion 10A or the top plate portion 10A presumed to have a high possibility that a collision load is applied along the opposite direction between the top plate portion 10A and the bottom plate portion 11. When viewed from the surface position of the bottom plate portion 11 and the facing direction of the pair of side wall portions 10B, a part of the plate material 22 is arranged at a position where it overlaps vertically (in the facing direction of the top plate portion 10A and the bottom plate portion 11).
Alternatively, the position where the pair of plate members 22 are provided is, for example, in the top plate portion 10A or the bottom plate portion 11 where it is presumed that a collision load in the direction opposite to the top plate portion 10A and the bottom plate portion 11 is likely to be applied. The center position (position of the shaft member 20) of the plate material 22 is located in a deformation region (see AREA in FIG. 14B) in which the side wall portion 10B is deformed when a preset collision load is applied to the surface position. Arrange like this.

衝突荷重が負荷される可能性が高いと推定される天板部10A又は底板部11における面位置は、例えば、その構造部材1を配置する車両位置に基づき、過去の事故情報などから、車両の側面衝突によって、対象とする構造部材1のどの部分に衝突荷重が入力され易いかよって推定する。
また、変形領域の特定は、例えば、FEMシミュレーション解析によって、部材の変形位置を解析して求める。予め設定した衝突荷重は、構造部材1を使用する位置で耐衝撃性能として要求される許容の衝突荷重を採用する。
The surface position of the top plate portion 10A or the bottom plate portion 11, which is presumed to have a high possibility of being loaded with a collision load, is based on, for example, the vehicle position on which the structural member 1 is arranged, and is based on past accident information or the like. It is estimated based on which part of the target structural member 1 the collision load is likely to be input due to the side collision.
Further, the deformation region is specified by analyzing the deformation position of the member by, for example, FEM simulation analysis. As the preset collision load, the allowable impact load required for impact resistance at the position where the structural member 1 is used is adopted.

ここで、補強部材の取付けは、底板部11をハット断面部材10に溶接して閉断面形状とする前に実施しても良いし、底板部11をハット断面部材10に溶接した後で行っても良い。
上記の補強部材を備えた構造部材1にあっては、一対の側壁部10Bに当接する一対の板材22を連結部材で連結させることで、天板部10Aと底板部11の対向方向に入力される衝突荷重による一対の側壁部10Bの外方への膨らみ(座屈)を、連結部材での軸方向に沿った引張力で抑える。このため、少ない重量の補強部材で衝突時の変形を抑制することが可能となる。すなわち、本実施形態によれば、衝突時の部材断面変形を効果的に抑制し、特に曲げ変形における最大荷重を向上させることが可能となる。
Here, the reinforcing member may be attached before the bottom plate portion 11 is welded to the hat cross-sectional member 10 to form a closed cross-sectional shape, or after the bottom plate portion 11 is welded to the hat cross-sectional member 10. Is also good.
In the structural member 1 provided with the above-mentioned reinforcing member, the pair of plate members 22 in contact with the pair of side wall portions 10B are connected by the connecting member, so that the top plate portion 10A and the bottom plate portion 11 are input in the facing direction. The outward swelling (buckling) of the pair of side wall portions 10B due to the collision load is suppressed by the tensile force along the axial direction of the connecting member. Therefore, it is possible to suppress deformation at the time of collision with a reinforcing member having a small weight. That is, according to the present embodiment, it is possible to effectively suppress the cross-sectional deformation of the member at the time of collision, and to improve the maximum load particularly in the bending deformation.

また本実施形態によれば、軸部材20(ネジ棒)にナット部材21を螺合させることで補強部材を構成する一対の板材22が構造部材1に取り付けられる。このため、構造部材1への補強部材の取付けに溶接作業が不要となる。この結果、本実施形態によれば、構造部材1の高強度化による溶接性の低下を懸念し、溶接による接合手法を回避しつつ、螺合という簡便な取付け方法で耐衝突性能を向上させることが可能となる。
なお、軸部材20の端部に対し各板材22を溶接にて固定しても良いが、螺合による取付けの方が簡易な構造となる。
さらに、本実施形態によれば、プレスや曲げなどの加工によって補強部材を設けないため、部品点数の増加による重量増加や、金型の増加によるコスト増加を避けるという効果もある。
Further, according to the present embodiment, a pair of plate members 22 constituting the reinforcing member is attached to the structural member 1 by screwing the nut member 21 into the shaft member 20 (screw rod). Therefore, welding work is not required to attach the reinforcing member to the structural member 1. As a result, according to the present embodiment, there is a concern that the weldability is deteriorated due to the increase in strength of the structural member 1, and the collision resistance is improved by a simple mounting method of screwing while avoiding the joining method by welding. Is possible.
Although each plate member 22 may be fixed to the end of the shaft member 20 by welding, mounting by screwing has a simpler structure.
Further, according to the present embodiment, since the reinforcing member is not provided by processing such as pressing or bending, there is an effect of avoiding an increase in weight due to an increase in the number of parts and an increase in cost due to an increase in dies.

発明者らは、FEM解析により、図1及び図2に示すような寸法のハット断面部材と底板部とから閉断面を構成する構造部材(中空部材)に対し、本発明に基づく補強部材による効果を確認するため、3点曲げ試験での部品変形の挙動を詳細に解析した。3点曲げの解析条件は、図6及び図7に示すように、構造部材における長手方向に離れた下面の2点を支持部材31で支持し、長手方向中央部に上側からパンチ30によって荷重を負荷するという条件である。 By FEM analysis, the inventors have performed an effect of the reinforcing member based on the present invention on a structural member (hollow member) constituting a closed cross section from a hat cross-section member having dimensions as shown in FIGS. 1 and 2 and a bottom plate portion. In order to confirm, the behavior of component deformation in the three-point bending test was analyzed in detail. As shown in FIGS. 6 and 7, the analysis conditions for the three-point bending are that two points on the lower surface of the structural member separated in the longitudinal direction are supported by the support member 31, and a load is applied to the central portion in the longitudinal direction from the upper side by a punch 30. It is a condition to load.

ハット断面部材10には、厚さ1.2mm、引張強度1180MPaの鋼板を使用した。底板部11には、厚さ1.2mm、引張強度590MPaの鋼板を使用した。また、軸部材20を構成するネジ棒及びナット部材21には、M6のSS400からなる鋼材を使用した。板材22には、SS400からなる鋼材をした。板材22の寸法は、図4のように、側壁部10Bよりも厚い板材とした。板材22は、側壁部よりも曲げ剛性が高くなるように設定することが好ましい。 For the hat cross-section member 10, a steel plate having a thickness of 1.2 mm and a tensile strength of 1180 MPa was used. For the bottom plate portion 11, a steel plate having a thickness of 1.2 mm and a tensile strength of 590 MPa was used. Further, a steel material made of SS400 of M6 was used for the screw rod and the nut member 21 constituting the shaft member 20. The plate material 22 was made of a steel material made of SS400. As shown in FIG. 4, the size of the plate material 22 is a plate material thicker than the side wall portion 10B. It is preferable that the plate material 22 is set so that the bending rigidity is higher than that of the side wall portion.

ここで、衝突時挙動を模して、天板部10Aに底板部11側に向けて荷重をパンチ30で負荷した場合、図8及び図9に示すように、ストローク(押込み量)の増加に伴い、部材長手方向の中央部であるパンチ接触部での変形が開始し、衝突荷重が増加した。なお、ストローク量は、パンチ30が天板部10Aに接触した状態を0mmとし、下方に向けた押込み量である。
そして、図8に示すように、荷重が最大値(最大荷重)に到達した後、ストロークが増加するにつれて荷重が低下するが、構造部材の断面形状を見ると、図9(c)のように、側壁部10Bが開くように大きく変形し、この変形による部材の折れ曲りが進行することで、荷重が低下していくことが判明した。
Here, when a load is applied to the top plate portion 10A toward the bottom plate portion 11 side by the punch 30 to imitate the behavior at the time of a collision, the stroke (pushing amount) increases as shown in FIGS. 8 and 9. Along with this, deformation started at the punch contact portion, which is the central portion in the longitudinal direction of the member, and the collision load increased. The stroke amount is 0 mm when the punch 30 is in contact with the top plate portion 10A, and is a downward pushing amount.
Then, as shown in FIG. 8, after the load reaches the maximum value (maximum load), the load decreases as the stroke increases, but the cross-sectional shape of the structural member is as shown in FIG. 9 (c). It was found that the side wall portion 10B was greatly deformed so as to open, and the bending of the member due to this deformation progressed, so that the load decreased.

この検討により、発明者らは、耐衝突性能、特に最大荷重を向上させるためには、側壁部10Bの開き(外方への膨らみ)による断面形状の変化を抑制することが有効であることを見出した。更に、側壁部10Bの開きを抑え、断面形状を保つ手法として、一般に流通し安価に入手可能なボルトとナットを活用する手法を見出した。断面変形を抑制する手法として、プレスや曲げなどの加工を要する補強部材を取り付ける方法も挙げられるが、この場合、部品点数や金型の増加などコスト面での課題があり、また補強部材を取り付ける手段として、溶接性を考慮する必要がある。一方、ボルトとナットを使用した場合、溶接性の低下を考慮した簡便な性能向上手法となる。 Based on this study, the inventors have found that it is effective to suppress changes in the cross-sectional shape due to the opening (swelling outward) of the side wall portion 10B in order to improve the collision resistance performance, particularly the maximum load. I found it. Furthermore, as a method of suppressing the opening of the side wall portion 10B and maintaining the cross-sectional shape, a method of utilizing bolts and nuts that are generally distributed and inexpensively available has been found. As a method of suppressing cross-sectional deformation, there is also a method of attaching a reinforcing member that requires processing such as pressing or bending, but in this case, there is a cost problem such as an increase in the number of parts and a mold, and the reinforcing member is attached. As a means, it is necessary to consider weldability. On the other hand, when bolts and nuts are used, it is a simple performance improvement method in consideration of deterioration of weldability.

以下、各実施例について具体的に説明する。
[実施例1]
図1の構造部材1に対し、側方からみて、パンチ30での荷重負荷位置と上下に並ぶ位置に、上記構成の補強部材の板材22を設けた場合(図3、図4参照)と、補強部材を設けない場合とにおける、荷重-ストロークの関係を求めた。そして、図10に示す結果となった。符号Dは、補強部材を設けた場合であり、符号Eは補強部材を設けない場合である。
図10から分かるように、本発明に基づく補強部材を設けない場合には、最大荷重は16.3[kN]であったが、本発明に基づく補強部材を設けた場合には、最大荷重が20.3[kN]と向上していることが分かった。
Hereinafter, each embodiment will be specifically described.
[Example 1]
When the plate material 22 of the reinforcing member having the above configuration is provided at a position vertically aligned with the load-bearing position of the punch 30 when viewed from the side with respect to the structural member 1 of FIG. 1 (see FIGS. 3 and 4). The load-stroke relationship was obtained when the reinforcing member was not provided. Then, the result shown in FIG. 10 was obtained. Reference numeral D is a case where a reinforcing member is provided, and reference numeral E is a case where a reinforcing member is not provided.
As can be seen from FIG. 10, the maximum load was 16.3 [kN] when the reinforcing member based on the present invention was not provided, but when the reinforcing member based on the present invention was provided, the maximum load was increased. It was found that it improved to 20.3 [kN].

[実施例2]
次に、パンチ30による荷重負荷位置と板材22の取付け位置(板材22の中心位置(軸部材20の軸位置))との関係を図11のように変更して実施してみた。No.5では、図12に示す板材(ワッシャ部材22)を使用している。
その結果を、表1に示す。
ここで、板材22中心位置でx=0が、側面視で荷重負荷位置と上下で重なる位置を示している。
[Example 2]
Next, the relationship between the load-bearing position of the punch 30 and the mounting position of the plate material 22 (center position of the plate material 22 (shaft position of the shaft member 20)) was changed as shown in FIG. No. In No. 5, the plate material (washer member 22) shown in FIG. 12 is used.
The results are shown in Table 1.
Here, x = 0 at the center position of the plate material 22 indicates a position that overlaps with the load load position in the side view.

Figure 0007001075000001
Figure 0007001075000001

表1から分かるように、側面視で、荷重負荷の近傍に板材22を設けることで、最大荷重が向上していることが分かる。また、板材22における、構造部材1の長手方向に沿った長さを大きくする(No.4)ことで、No.1に比べて、最大荷重が向上することが分かった。また、No.3やNo.5のように、補強部材の数を増やしたり、板材22の寸法を大きくしたりしても、No.1に比べて、最大荷重が向上することが分かった。 As can be seen from Table 1, it can be seen from the side view that the maximum load is improved by providing the plate material 22 in the vicinity of the load. Further, by increasing the length of the plate member 22 along the longitudinal direction of the structural member 1 (No. 4), No. 4 can be obtained. It was found that the maximum load was improved as compared with 1. In addition, No. 3 and No. Even if the number of reinforcing members is increased or the size of the plate material 22 is increased as in No. 5, No. It was found that the maximum load was improved as compared with 1.

[実施例3]
また、パンチ30でストローク50mmに設定してFEM解析をしたところ、図14(a)のような変形(断面開き)が側壁部10Bに生じた。この解析による変形領域AREAを、側壁部10Bを変形前の形状にトレースした図が、図14(b)である。この例では、変形量(断面開き量)が1mm以上の場合の部分を変形領域AREAとした。
そして、荷重入力位置に対する板材22の取付け点(軸部材20の位置)を変えて最大荷重を求めたところ、表2に示す結果になった。
[Example 3]
Further, when FEM analysis was performed with the punch 30 set to a stroke of 50 mm, deformation (cross-sectional opening) as shown in FIG. 14A occurred in the side wall portion 10B. FIG. 14B is a diagram in which the deformation region AREA obtained by this analysis is traced to the shape of the side wall portion 10B before deformation. In this example, the portion where the deformation amount (cross-sectional opening amount) is 1 mm or more is defined as the deformation region AREA.
Then, when the maximum load was obtained by changing the mounting point (position of the shaft member 20) of the plate material 22 with respect to the load input position, the results shown in Table 2 were obtained.

Figure 0007001075000002
Figure 0007001075000002

表2から分かるように、板材22の取付け点が、側面視で荷重入力位置と重なる位置(x=0)から構造部材1の長手方向にずれるほど、最大荷重が小さくなるが、板材22の取付け点が変形領域AREAに入っていれば、補強部材を設けない場合に比べて最大荷重が確実に大きい値となるようにすることができることを確認した。
この例では、変形領域AREAは、天板面の位置を基準に、高さ方向(y方向)の最下部位置が30mmで、横方向(x方向)の最大離隔距離が±28mmであった。
As can be seen from Table 2, the maximum load becomes smaller as the mounting point of the plate material 22 deviates from the position (x = 0) that overlaps with the load input position in the longitudinal direction of the structural member 1, but the plate material 22 is mounted. It was confirmed that if the point is within the deformation region AREA, the maximum load can be surely increased as compared with the case where the reinforcing member is not provided.
In this example, the deformation region AREA has a lowermost position in the height direction (y direction) of 30 mm and a maximum separation distance in the lateral direction (x direction) of ± 28 mm with respect to the position of the top plate surface.

1 構造部材(中空部材)
10 ハット断面部材
10A 天板部
10B 側壁部
10Ba フランジ
10Bb 貫通穴
11 底板部
20 軸部材
20A 板材
21 ナット部材
22 板材(ワッシャ部材)
30 パンチ
AREA 変形領域
1 Structural member (hollow member)
10 Hat cross-section member 10A Top plate part 10B Side wall part 10Ba Flange 10Bb Through hole 11 Bottom plate part 20 Shaft member 20A Plate material 21 Nut member 22 Plate material (washer member)
30 Punch AREA Deformation area

Claims (5)

天板部、上記天板部の幅方向両側にそれぞれ連続する一対の側壁部を有する第1の板部材、及び上記天板部に対向配置した底板部を構成する第2の板部材の2つの板部材で閉断面形状を構成する中空部材と、
上記一対の側壁部の各外壁面にそれぞれ当接する一対のワッシャ部材と、
記一対の側壁部間の距離が広がることを拘束する連結部材と、を備え
上記連結部材は、
上記天板部の幅方向に延在して上記一対の側壁部及び上記一対のワッシャ部材を貫通すると共に軸方向端部に雄ねじ部が形成された軸部材と、
上記軸部材の雄ねじ部に螺合し上記側壁部の外壁面に上記ワッシャ部材を挟んで対向するナット部材と、からなり、
上記軸部材は、上記一対の側壁部の内壁面に当接する部分を有さず、且つ、該軸部材の外周に、上記ナット部材の締付けによって上記一対の側壁部の内壁面に当接して圧縮荷重を受ける圧縮材を有しない、
ことを特徴とする自動車用構造部材。
Two, a top plate portion, a first plate member having a pair of side wall portions continuous on both sides in the width direction of the top plate portion, and a second plate member constituting the bottom plate portion arranged facing the top plate portion. Hollow members that form a closed cross-sectional shape with plate members ,
A pair of washer members that abut on each outer wall surface of the pair of side wall portions,
A connecting member that restrains the increase in the distance between the pair of side wall portions is provided .
The above connecting member
A shaft member extending in the width direction of the top plate portion, penetrating the pair of side wall portions and the pair of washer members , and having a male screw portion formed at an axial end portion.
It is composed of a nut member that is screwed into the male screw portion of the shaft member and faces the outer wall surface of the side wall portion with the washer member sandwiched between them .
The shaft member does not have a portion that abuts on the inner wall surface of the pair of side wall portions, and is compressed by abutting on the inner wall surface of the pair of side wall portions by tightening the nut member on the outer periphery of the shaft member. Has no compression material under load,
A structural member for automobiles, which is characterized by the fact that.
天板部、上記天板部の幅方向両側にそれぞれ連続する一対の側壁部を有する第1の板部材、及び上記天板部に対向配置した底板部を構成する第2の板部材の2つの板部材で閉断面形状を構成する中空部材と、
上記一対の側壁部のうちの一方の側壁部の外壁面に当接するワッシャ部材と、
記一対の側壁部間の距離が広がることを拘束する連結部材と、を備え
上記連結部材は、
一端部が上記一対の側壁部のうちの他方の側壁部の外壁面に当接するボルトの頭になっており、上記天板部の幅方向に延在して上記一対の側壁部及び上記ワッシャ部材を貫通すると共に上記一方の側壁部側の軸方向端部に雄ねじ部が形成された軸部材と、
上記軸部材の雄ねじ部に螺合し上記一方の側壁部外壁面に上記ワッシャ部材を挟んで対向するナット部材と、からなり、
上記軸部材は、上記一対の側壁部の内壁面に当接する部分を有さず、且つ、該軸部材の外周に、上記ナット部材の締付けによって上記一対の側壁部の内壁面に当接して圧縮荷重を受ける圧縮材を有しない、
ことを特徴とする自動車用構造部材。
Two, a top plate portion, a first plate member having a pair of side wall portions continuous on both sides in the width direction of the top plate portion, and a second plate member constituting the bottom plate portion arranged facing the top plate portion. Hollow members that form a closed cross-sectional shape with plate members ,
A washer member that abuts on the outer wall surface of one of the pair of side wall portions,
A connecting member that restrains the increase in the distance between the pair of side wall portions is provided .
The above connecting member
One end portion is the head of a bolt that abuts on the outer wall surface of the other side wall portion of the pair of side wall portions, and extends in the width direction of the top plate portion to extend the pair of side wall portions and the washer member . A shaft member having a male screw portion formed at the axial end portion on one side wall portion side while penetrating the shaft member.
It is composed of a nut member that is screwed into the male screw portion of the shaft member and faces the outer wall surface of the one side wall portion with the washer member sandwiched between them .
The shaft member does not have a portion that abuts on the inner wall surface of the pair of side wall portions, and is compressed by abutting on the inner wall surface of the pair of side wall portions by tightening the nut member on the outer periphery of the shaft member. Has no compression material under load,
A structural member for automobiles, which is characterized by the fact that.
一対の側壁部の対向方向からみて、上記天板部と上記底板部の対向方向に沿った衝突荷重が負荷される可能性が高いと推定される上記天板部又は上記底板部における面位置と、上記ワッシャ部材の少なくとも一部とが、上記天板部と上記底板部との対向方向で重なることを特徴とする請求項1又は請求項に記載した自動車用構造部材。 With respect to the surface position of the top plate portion or the bottom plate portion, which is presumed to have a high possibility of being loaded with a collision load along the facing direction of the top plate portion and the bottom plate portion when viewed from the facing direction of the pair of side wall portions. The structural member for an automobile according to claim 1 or 2 , wherein at least a part of the washer member overlaps the top plate portion and the bottom plate portion in a facing direction. 上記天板部と上記底板部との対向方向に沿った衝突荷重が負荷される可能性が高いと推定される上記天板部又は上記底板部の面位置に、予め設定した衝突荷重を負荷した際に上記側壁部が変形する変形領域に対し、上記ワッシャ部材の少なくとも一部が入るように上記ワッシャ部材を配置することを特徴とする請求項1~請求項のいずれか1項に記載した自動車用構造部材。 A preset collision load is applied to the surface position of the top plate or the bottom plate, which is presumed to have a high possibility of being loaded with the collision load along the opposite direction between the top plate and the bottom plate. The invention according to any one of claims 1 to 3 , wherein the washer member is arranged so that at least a part of the washer member is inserted into the deformed region where the side wall portion is deformed. Structural members for automobiles. 天板部、上記天板部の幅方向両側にそれぞれ連続する一対の側壁部を有する第1の板部材、及び上記天板部に対向配置した底板部を構成する第2の板部材の2つの板部材で閉断面形状を構成した自動車用中空部材の補強方法であって、
軸方向両端部の少なくとも一方の端部に雄ねじ部が形成されたネジ棒からなる軸部材と、上記軸部材の雄ねじ部に螺合可能なナット部材を用意し、
上記一対の側壁部に上記軸部材が貫通可能な貫通穴をそれぞれ開口し、
補強する上記一対の側壁部の内壁面間に他の補強部材を配置することなく、その対をなす貫通穴に上記軸部材を貫通させ、
側壁部から突出した上記軸部材の端部に対し、ワッシャ部材を介してナット部材を螺合し締め付けることを特徴とする自動車用中空部材の補強方法。
Two, a top plate portion, a first plate member having a pair of side wall portions continuous on both sides in the width direction of the top plate portion, and a second plate member constituting the bottom plate portion arranged facing the top plate portion. It is a method of reinforcing a hollow member for automobiles whose closed cross-sectional shape is composed of plate members .
A shaft member made of a screw rod having a male screw portion formed at at least one end of both ends in the axial direction and a nut member screwable to the male screw portion of the shaft member are prepared.
A through hole through which the shaft member can penetrate is opened in each of the pair of side wall portions.
The shaft member is passed through the through hole forming the pair without arranging another reinforcing member between the inner wall surfaces of the pair of side wall portions to be reinforced .
A method for reinforcing a hollow member for an automobile, which comprises screwing and tightening a nut member via a washer member to an end portion of the shaft member protruding from a side wall portion.
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