JP2015160524A - Vehicle body structure - Google Patents

Vehicle body structure Download PDF

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JP2015160524A
JP2015160524A JP2014037066A JP2014037066A JP2015160524A JP 2015160524 A JP2015160524 A JP 2015160524A JP 2014037066 A JP2014037066 A JP 2014037066A JP 2014037066 A JP2014037066 A JP 2014037066A JP 2015160524 A JP2015160524 A JP 2015160524A
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carbon fiber
continuous carbon
reinforcing material
fiber layer
hollow frame
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JP6235375B2 (en
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飛田　一紀
Kazunori Hida
一紀 飛田
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Honda Motor Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To effectively reinforce the wall part of a hollow frame made of metal, which is located on the tensile side when load is applied from outside a vehicle body, by means of a reinforcement made of CFRP.SOLUTION: A reinforcement 19 made of CFRP joined in a wall part 18b in the direction of the vehicle width of a B pillar 13 made of metal, which is located on the tensile side when the collision load resulting from a side collision is input contains a continuous carbon fiber layer 22 with a thickness of 0.8 mm or more oriented along the longitudinal direction of the B pillar 13. Accordingly, resistant load equal to high tensile steel with a thickness of 1.8 mm and a tensile strength of 980 MPa can be obtained by the reinforcement 19 made of CFRP that is thin and lightweight. Moreover, since it is enough to attach the reinforcement 19 to only a place where tensile load concentrates, the amount of expensive carbon fiber to be used is decreased to minimize increases in cost and weight.

Description

本発明は、車体外部からの荷重の入力時に引張側となる金属製の中空フレームの壁部にＣＦＲＰ製の補強材を接着する自動車の車体構造に関する。   The present invention relates to a vehicle body structure for an automobile in which a CFRP reinforcing material is bonded to a wall portion of a metal hollow frame that becomes a tension side when a load is input from the outside of the vehicle body.

金属板とＣＦＲＰ板とをエポキシ系発泡樹脂で接着することで、短期間で製造が可能であり、加熱硬化後のそりの発生を抑制することができ、かつ補強効果に優れた金属樹脂複合構造体を得るものが、下記特許文献１により公知である。   A metal resin composite structure that can be manufactured in a short period of time by bonding a metal plate and a CFRP plate with an epoxy-based foamed resin, can suppress the occurrence of warpage after heat curing, and has an excellent reinforcing effect What obtains a body is known from Patent Document 1 below.

また未硬化繊維強化樹脂（プリプレグ）と鋼板とを貼り合わせたものを所定形状にプレス成形し、次いでプリプレグを挟んで鋼板に被溶接物を溶接した後にプリプレグを硬化させることで、プリプレグのプレス成形および鋼板のプレス成形を一工程で完了させるものが、下記特許文献２により公知である。   Also, press bonding of uncured fiber reinforced resin (prepreg) and steel plate is press-molded into a predetermined shape, and then the prepreg is cured after welding the work piece to the steel plate with the prepreg sandwiched between them. Patent Document 2 listed below discloses that the press forming of a steel plate is completed in one step.

特開２００７−１９６５４５号公報JP 2007-196545 A 特開２００９−１７８９９７号公報JP 2009-178997 A

ところで、上記特許文献１、２に記載されたものは、鋼板に貼り合わされるＣＦＲＰの連続炭素繊維の配向方向やＣＦＲＰの厚さについて開示しておらず、引張強度に優れた連続炭素繊維の特性を充分に活かしきれないだけでなく、更なる強度増加や軽量化の余地を残している。   By the way, what was described in the said patent documents 1 and 2 is not disclosing about the orientation direction of CFRP continuous carbon fiber bonded to a steel plate and the thickness of CFRP, and the characteristics of continuous carbon fiber excellent in tensile strength. As well as not being able to fully utilize, there is room for further strength increase and weight reduction.

本発明は前述の事情に鑑みてなされたもので、車体外部からの荷重の入力時に引張側となる金属製の中空フレームの壁部をＣＦＲＰ製の補強材で効果的に補強することを目的とする。   The present invention has been made in view of the above circumstances, and has an object to effectively reinforce a wall portion of a metal hollow frame which becomes a tension side when a load is input from the outside of a vehicle body with a reinforcing material made of CFRP. To do.

上記目的を達成するために、請求項１に記載された発明によれば、車体外部からの荷重の入力時に引張側となる金属製の中空フレームの壁部にＣＦＲＰ製の補強材を接着する自動車の車体構造であって、前記補強材は前記中空フレームの長手方向に沿って配向された厚さが０．８ｍｍ以上の連続炭素繊維層を含むことを特徴とする自動車の車体構造が提案される。   In order to achieve the above object, according to the invention described in claim 1, an automobile in which a CFRP reinforcing material is bonded to a wall portion of a metal hollow frame that becomes a tension side when a load is input from the outside of the vehicle body. The vehicle body structure according to claim 1, wherein the reinforcing member includes a continuous carbon fiber layer having a thickness of 0.8 mm or more oriented along the longitudinal direction of the hollow frame. .

また請求項２に記載された発明によれば、請求項１の構成に加えて、前記中空フレームの壁部は、Ｂピラーの上下方向中間部の車幅方向内面、サイドシルの前後方向中間部の車幅方向内面あるいはルーフアーチの車幅方向外端部の下面であることを特徴とする自動車の車体構造が提案される。   According to the second aspect of the present invention, in addition to the configuration of the first aspect, the wall portion of the hollow frame includes an inner surface in the vehicle width direction of an intermediate portion in the vertical direction of the B pillar and an intermediate portion in the front and rear direction of the side sill. A vehicle body structure is proposed, which is the inner surface in the vehicle width direction or the lower surface of the outer end portion of the roof arch in the vehicle width direction.

また請求項３に記載された発明によれば、請求項１または請求項２の構成に加えて、前記補強材は前記中空フレームの長手方向に直交する方向に配向された直交連続炭素繊維層を含み、前記連続炭素繊維層は前記直交連続炭素繊維層より厚さを大きくし、前記連続炭素繊維層は前記直交連続炭素繊維層を挟んで厚さ方向に対称に配置されることを特徴とする自動車の車体構造が提案される。   According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, the reinforcing material includes an orthogonal continuous carbon fiber layer oriented in a direction orthogonal to the longitudinal direction of the hollow frame. The continuous carbon fiber layer is thicker than the orthogonal continuous carbon fiber layer, and the continuous carbon fiber layer is disposed symmetrically in the thickness direction across the orthogonal continuous carbon fiber layer. A car body structure is proposed.

また請求項４に記載された発明によれば、請求項１〜請求項３の何れか１項の構成に加えて、前記補強材は前記中空フレームの壁部に発泡性接着剤で接着されることを特徴とする自動車の車体構造が提案される。   According to the invention described in claim 4, in addition to the structure of any one of claims 1 to 3, the reinforcing material is bonded to the wall portion of the hollow frame with a foaming adhesive. A vehicle body structure characterized by this is proposed.

また請求項５に記載された発明によれば、請求項１〜請求項４の何れか１項の構成に加えて、前記中空フレームの壁部に接着したＣＦＲＰの未硬化のプリプレグを乾燥炉の熱で硬化させることで前記補強材を成形することを特徴とする自動車の車体構造が提案される。   According to the invention described in claim 5, in addition to the structure of any one of claims 1 to 4, an uncured CFRP prepreg bonded to the wall portion of the hollow frame is used in a drying furnace. A vehicle body structure is proposed in which the reinforcing material is formed by being cured by heat.

尚、実施の形態のサイドシル１１、Ｂピラー１３およびフロントルーフアーチ１６は本発明の中空フレームに対応し、更にフロントルーフアーチ１６は本発明のルーフアーチにも対応し、実施の形態の車幅方向内壁部１８ｂは本発明の壁部に対応する。   The side sill 11, the B pillar 13 and the front roof arch 16 of the embodiment correspond to the hollow frame of the present invention, and the front roof arch 16 also corresponds to the roof arch of the present invention. The inner wall portion 18b corresponds to the wall portion of the present invention.

請求項１の構成によれば、車体外部からの荷重の入力時に引張側となる金属製の中空フレームの壁部に接着されるＣＦＲＰ製の補強材は、中空フレームの長手方向に沿って配向された厚さが０．８ｍｍ以上の連続炭素繊維層を含むので、厚さ１．８ｍｍ、引張強度９８０ＭＰａの高張力鋼と同等の耐荷重を薄くて軽量なＣＦＲＰ製の補強材で得ることができるだけでなく、引張荷重が集中する場所だけに補強材を貼り付ければよいので、高価な炭素繊維の使用量を減らしてコストおよび重量の増加を最小限に抑えることができる。   According to the configuration of the first aspect, the CFRP reinforcing material bonded to the wall portion of the metal hollow frame that becomes the pull side when a load is input from the outside of the vehicle body is oriented along the longitudinal direction of the hollow frame. Since a continuous carbon fiber layer with a thickness of 0.8 mm or more is included, a load resistance equivalent to that of a high-tensile steel with a thickness of 1.8 mm and a tensile strength of 980 MPa can be obtained with a thin and lightweight CFRP reinforcing material. In addition, since it is only necessary to attach the reinforcing material only to the place where the tensile load is concentrated, the amount of expensive carbon fiber used can be reduced, and the increase in cost and weight can be minimized.

また請求項２の構成によれば、中空フレームの壁部は、Ｂピラーの上下方向中間部の車幅方向内面、サイドシルの前後方向中間部の車幅方向内面あるいはルーフアーチの車幅方向外端部の下面であるので、衝突荷重が入力したときに強い引張荷重が作用する部分を補強材で効果的に補強することができる。   According to the second aspect of the present invention, the wall portion of the hollow frame includes the inner side in the vehicle width direction of the intermediate portion in the vertical direction of the B pillar, the inner surface in the vehicle width direction of the intermediate portion in the front and rear direction of the side sill, or the outer end in the vehicle width direction of the roof arch. Since it is the lower surface of a part, the part to which a strong tensile load acts when a collision load is input can be effectively reinforced with a reinforcing material.

また請求項３の構成によれば、補強材は中空フレームの長手方向に直交する方向に配向された直交連続炭素繊維層を含み、連続炭素繊維層は直交連続炭素繊維層より厚さを大きくし、連続炭素繊維層は直交連続炭素繊維層を挟んで厚さ方向に対称に配置されるので、直交連続炭素繊維層により中空フレームの長手方向に直交する方向の引張荷重を支持できるだけでなく、連続炭素繊維層を構成する連続繊維がばらばらにならないように拘束して強度低下を防止することができる。   According to the configuration of claim 3, the reinforcing material includes an orthogonal continuous carbon fiber layer oriented in a direction orthogonal to the longitudinal direction of the hollow frame, and the continuous carbon fiber layer is thicker than the orthogonal continuous carbon fiber layer. The continuous carbon fiber layer is arranged symmetrically in the thickness direction across the orthogonal continuous carbon fiber layer, so that the continuous continuous carbon fiber layer can not only support the tensile load in the direction perpendicular to the longitudinal direction of the hollow frame, but also be continuous. The continuous fibers constituting the carbon fiber layer can be constrained so as not to be separated to prevent a decrease in strength.

また請求項４の構成によれば、補強材は中空フレームの壁部に発泡性接着剤で接着されるので、金属製の中空フレームとＣＦＲＰ製の補強材との熱膨張率の差を発泡性接着剤で吸収することで、高温環境下での補強材の剥がれを防止することができる。   According to the fourth aspect of the present invention, since the reinforcing material is bonded to the wall portion of the hollow frame with the foaming adhesive, the difference in the thermal expansion coefficient between the metal hollow frame and the CFRP reinforcing material is reduced. Absorption with an adhesive can prevent the reinforcing material from peeling off in a high temperature environment.

また請求項５の構成によれば、中空フレームの壁部に接着したＣＦＲＰの未硬化のプリプレグを乾燥炉の熱で硬化させるので、曲面よりなる中空フレームの壁部に沿う形状の補強材を特別の金型を必要とせず容易に成形することが可能となって生産性が向上するだけでなく、プリプレグの含浸樹脂を接着剤として利用して補強材を中空フレームの壁部に貼り付けることができる。   According to the configuration of claim 5, since the CFRP uncured prepreg bonded to the wall of the hollow frame is cured by the heat of the drying furnace, a reinforcing material having a shape along the wall of the hollow frame made of a curved surface is specially used. This makes it possible to easily mold without the need for a metal mold, thus improving productivity, and using a prepreg impregnating resin as an adhesive to attach a reinforcing material to the wall of the hollow frame. it can.

自動車の車体フレームの部分斜視図。（第１の実施の形態）The partial perspective view of the body frame of a car. (First embodiment) 図１の２部分解斜視図。（第１の実施の形態）The 2nd part exploded perspective view of FIG. (First embodiment) 補強材の連続炭素繊維層および直交連続炭素繊維層の積層状態の説明図。（第１の実施の形態）Explanatory drawing of the lamination | stacking state of the continuous carbon fiber layer and orthogonal continuous carbon fiber layer of a reinforcing material. (First embodiment) 図１の４−４線拡大断面図。（第１の実施の形態）FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. (First embodiment) Ｂピラーの曲げ強度を示すグラフ。（第１の実施の形態）The graph which shows the bending strength of B pillar. (First embodiment) 図１の６−６線断面図。（第１の実施の形態）FIG. 6 is a sectional view taken along line 6-6 in FIG. (First embodiment) 図４に対応する図。（第２の実施の形態）The figure corresponding to FIG. (Second Embodiment)

第１の実施の形態First embodiment

以下、図１〜図６に基づいて本発明の第１の実施の形態を説明する。尚、本明細書において、前後方向、左右方向（車幅方向）、上下方向とは、運転席に着座した乗員を基準として定義される。   Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined with reference to an occupant seated in the driver's seat.

図１に示すように、自動車の車体フレームは、左右一対のサイドシル１１，１１を備えており、サイドシル１１，１１の前端から左右一対のＡピラーロア１２，１２が立ち上がるとともに、サイドシル１１，１１の前後方向中間部から左右一対のＢピラー１３，１３が立ち上がる。Ａピラーロア１２，１２の上端に接続された左右一対のＡピラーアッパー１４，１４の後端から後方に延びる左右一対のルーフサイドレール１５，１５にはＢピラー１３，１３の上端が接続され、左右のルーフサイドレール１５，１５の前端間が車幅方向に延びるフロントルーフアーチ１６の両端に接続される。   As shown in FIG. 1, the body frame of the automobile includes a pair of left and right side sills 11, 11. A pair of left and right A pillar lowers 12, 12 rise from the front ends of the side sills 11, 11, and front and rear of the side sills 11, 11. A pair of left and right B pillars 13 and 13 rises from the middle in the direction. The upper ends of the B pillars 13 and 13 are connected to the pair of left and right roof side rails 15 and 15 extending rearward from the rear ends of the pair of left and right A pillar uppers 14 and 14 connected to the upper ends of the A pillar lowers 12 and 12, respectively. The front side of the roof side rails 15 and 15 is connected to both ends of a front roof arch 16 extending in the vehicle width direction.

図１および図２に示すように、Ｂピラー１３はハット状断面の鋼板よりなるアウターパネル１７と、ハット状断面の鋼板よりなるインナーパネル１８とを、それらの接合フランジ１７ａ，１７ａ，１８ａ，１８ａどうしを溶接Ｗすることで閉断面に構成される。そしてインナーパネル１８の車幅方向内壁部１８ｂにＣＦＲＰ（カ−ボン繊維強化樹脂）製の補強材１９がエポキシ樹脂系の発泡性接着剤２０で貼り付けられる。   As shown in FIGS. 1 and 2, the B pillar 13 includes an outer panel 17 made of a steel plate having a hat-shaped cross section and an inner panel 18 made of a steel plate having a hat-shaped cross section, and their joining flanges 17a, 17a, 18a, 18a. A closed cross section is formed by welding the two together. A reinforcing material 19 made of CFRP (carbon fiber reinforced resin) is attached to the inner wall portion 18 b of the inner panel 18 with an epoxy resin-based foaming adhesive 20.

図３および図４に示すように、補強材１９は、連続炭素繊維２１…を一方向に引き揃えてシート状にしたＵＤを未硬化の熱硬化性マトリクス樹脂内に埋設したプリプレグを１０層に積層して構成される。１０層のプリプレグのうち、積層方向両側の各４層は連続炭素繊維２１…の配向方向がＢピラー１３の長手方向（上下方向）に沿っており、これらの８層は連続炭素繊維層２２…を構成する。積層方向中央の２層は連続炭素繊維２１…の配向方向がＢピラー１３の長手方向（上下方向）に対して直交しており、これらの２層は直交連続炭素繊維層２３，２３を構成する。連続炭素繊維層２２および直交連続炭素繊維層２３の各層の厚さは０．１ｍｍであり、よって補強材１９のトータルの厚さは１．０ｍｍとなり、連続炭素繊維層２２…と直交連続炭素繊維層２３，２３との厚さの比率は４：１となる。   As shown in FIGS. 3 and 4, the reinforcing member 19 is made of 10 layers of prepregs in which UDs in which continuous carbon fibers 21 are aligned in one direction to form a sheet are embedded in an uncured thermosetting matrix resin. It is constructed by stacking. Among the 10 layers of prepreg, each of the 4 layers on both sides of the lamination direction has the orientation direction of the continuous carbon fibers 21 along the longitudinal direction (vertical direction) of the B pillar 13, and these 8 layers are the continuous carbon fiber layers 22. Configure. In the two layers at the center in the stacking direction, the orientation direction of the continuous carbon fibers 21 is orthogonal to the longitudinal direction (vertical direction) of the B pillar 13, and these two layers constitute orthogonal continuous carbon fiber layers 23, 23. . The thickness of each layer of the continuous carbon fiber layer 22 and the orthogonal continuous carbon fiber layer 23 is 0.1 mm. Therefore, the total thickness of the reinforcing material 19 is 1.0 mm, and the continuous carbon fiber layer 22. The thickness ratio between the layers 23 and 23 is 4: 1.

次に、上記構成を備えた本発明の実施の形態の作用を説明する。   Next, the operation of the embodiment of the present invention having the above configuration will be described.

Ｂピラー１３のインナーパネル１８の車幅方向内壁１８ｂに、プリプレグが未硬化の状態の補強材１９を発泡性接着剤２０の粘着性を利用して仮止めする。このとき、未硬化のプリプレグは柔軟性を有するため、曲面よりなるインナーパネル１８の車幅方向内壁１８ｂに容易に馴染ませることができる。次に、車体を乾燥炉に入れて加熱するとプリプレグが硬化して補強材１９が所定形状に成形されると同時に、発泡性接着剤２０が硬化してインナーパネル１８の車幅方向内壁部１８ｂに補強材１９を強固に接着する。このように、Ｂピラー１３のインナーパネル１８の車幅方向内壁部１８ｂに接着した未硬化の補強材１９を乾燥炉の熱で硬化させるので、曲面よりなるインナーパネル１８の車幅方向内壁部１８ｂに沿う形状の補強材１９を特別の金型を必要とせず容易に成形することが可能となって生産性が向上する。   The reinforcing material 19 in which the prepreg is uncured is temporarily fixed to the inner wall 18b of the inner panel 18 of the B pillar 13 using the adhesiveness of the foamable adhesive 20. At this time, since the uncured prepreg has flexibility, it can be easily adapted to the inner wall 18b in the vehicle width direction of the inner panel 18 formed of a curved surface. Next, when the vehicle body is placed in a drying oven and heated, the prepreg is cured and the reinforcing material 19 is formed into a predetermined shape, and at the same time, the foamable adhesive 20 is cured and applied to the inner wall portion 18b in the vehicle width direction of the inner panel 18. The reinforcing material 19 is firmly bonded. In this way, the uncured reinforcing material 19 bonded to the inner wall portion 18b in the vehicle width direction of the inner panel 18 of the B pillar 13 is cured by the heat of the drying furnace, so the inner wall portion 18b in the vehicle width direction of the inner panel 18 formed of a curved surface. The reinforcing material 19 having a shape along the line can be easily formed without requiring a special mold, and the productivity is improved.

鋼板製のインナーパネル１８の熱膨張率ａは、ＣＦＲＰ製の補強材１９の熱膨張率ｂよりも大きいため、温度変化に伴うインナーパネル１８および補強材１９の熱膨張量の差によってインナーパネル１８から補強材１９が剥がれ易くなるが、本実施の形態によれば、硬化後も柔軟性を失わない発泡性接着剤２０によって前記熱膨張量の差を吸収することで、インナーパネル１８からの補強材１９の剥がれを確実に防止することができる。   Since the thermal expansion coefficient “a” of the inner panel 18 made of steel plate is larger than the thermal expansion coefficient “b” of the reinforcing material 19 made of CFRP, the inner panel 18 varies depending on the difference in thermal expansion between the inner panel 18 and the reinforcing material 19 due to temperature change. However, according to the present embodiment, the difference from the thermal expansion amount is absorbed by the foaming adhesive 20 that does not lose its flexibility even after curing, so that the reinforcement from the inner panel 18 can be achieved. Peeling of the material 19 can be reliably prevented.

さて、車両が側面衝突を受けてＢピラー１３に衝突荷重が入力すると、Ｂピラー１３が車室側に湾曲するように変形するため、車幅方向外側のアウターパネル１７に圧縮荷重が作用し、車幅方向内側のインナーパネル１８に引張荷重が作用する。引張荷重が作用するインナーパネル１８の車幅方向内壁部１８ｂは長手方向に引き延ばされるように変形するが、その車幅方向内壁部１８ｂに貼り付けた補強材１９は連続炭素繊維２１…を前記長手方向に配向した８層の連続炭素繊維層２２…を備えるため、引張荷重に強い連続炭素繊維２１…でインナーパネル１８の伸び変形を阻止することで、衝突荷重によるＢピラー１３の車室側への変形を最小限に抑えることができる。   When the vehicle receives a side collision and a collision load is input to the B pillar 13, the B pillar 13 is deformed so as to bend toward the passenger compartment, so that a compression load acts on the outer panel 17 on the outer side in the vehicle width direction. A tensile load acts on the inner panel 18 on the inner side in the vehicle width direction. The inner wall portion 18b in the vehicle width direction of the inner panel 18 to which the tensile load acts is deformed so as to be extended in the longitudinal direction, but the reinforcing material 19 attached to the inner wall portion 18b in the vehicle width direction has the continuous carbon fibers 21. Since the eight continuous carbon fiber layers 22... Oriented in the longitudinal direction are provided, the inner panel 18 is prevented from being stretched and deformed by the continuous carbon fibers 21 resistant to the tensile load, so that the passenger compartment side of the B pillar 13 caused by the collision load. The deformation to can be minimized.

また補強材１９が連続炭素繊維層２２…だけを備えると、連続炭素繊維２１…がばらばらになって強度が低下する可能性があるが、補強材１９の厚さ中央に２層の直交連続炭素繊維層２３，２３を挟んだので、直交連続炭素繊維層２３，２３によって連続炭素繊維層２２…の連続炭素繊維２１…がばらばらになるのを防止して補強材１９の強度を確保することができるだけでなく、Ｂピラー１３のインナーパネル１８の長手方向に直交する方河の伸び変形を直交連続炭素繊維層２３，２３によって効果的に阻止することができる。特に、中央の直交連続炭素繊維層２３，２３と、その両側の各４層の連続炭素繊維層２２…とは補強材１９の厚さ方向に対称に配置されるので、少ない層数の直交連続炭素繊維層２３，２３で連続炭素繊維層２２…の連続炭素繊維２１…がばらばらになるのを効果的に防止することができる。   Further, if the reinforcing material 19 includes only the continuous carbon fiber layers 22..., The continuous carbon fibers 21 may be separated and the strength may be reduced. However, two layers of orthogonal continuous carbon are provided at the center of the thickness of the reinforcing material 19. Since the fiber layers 23 and 23 are sandwiched, it is possible to prevent the continuous carbon fibers 21 of the continuous carbon fiber layers 22 from being separated by the orthogonal continuous carbon fiber layers 23 and 23 to ensure the strength of the reinforcing material 19. Not only can the elongation deformation of the square perpendicular to the longitudinal direction of the inner panel 18 of the B pillar 13 be effectively prevented by the orthogonal continuous carbon fiber layers 23 and 23. In particular, since the central orthogonal continuous carbon fiber layers 23 and 23 and the four continuous carbon fiber layers 22 on each side thereof are arranged symmetrically in the thickness direction of the reinforcing material 19, the orthogonal continuous with a small number of layers. It is possible to effectively prevent the continuous carbon fibers 21 of the continuous carbon fiber layer 22 from being separated by the carbon fiber layers 23 and 23.

図５は、補強材１９の補強効果を示すグラフであり、横軸はＢピラー１３の変形ストローク、縦軸はＢピラー１３の曲げ強度である。破線は補強部材を持たない第１比較例のＢピラー１３に対応し、鎖線は厚さ１．８ｍｍ、引張強度９８０ＭＰａの高張力鋼の補強材をインナーパネル１８に貼り付けた第２比較例のＢピラー１３に対応し、実線は本発明の補強材１９を貼り付けた実施の形態のＢピラー１３に対応する。   FIG. 5 is a graph showing the reinforcing effect of the reinforcing member 19, where the horizontal axis represents the deformation stroke of the B pillar 13 and the vertical axis represents the bending strength of the B pillar 13. The broken line corresponds to the B pillar 13 of the first comparative example having no reinforcing member, and the chain line of the second comparative example in which a reinforcing material of high tensile steel having a thickness of 1.8 mm and a tensile strength of 980 MPa is attached to the inner panel 18. Corresponding to the B pillar 13, the solid line corresponds to the B pillar 13 of the embodiment in which the reinforcing material 19 of the present invention is attached.

実施の形態のＢピラー１３の曲げ強度は、補強材を持たない第１比較例のＢピラー１３よりも高く、厚さ１．８ｍｍの高張力鋼の補強材を持つ第２比較例のＢピラー１３と同等であることが分かる。   The bending strength of the B pillar 13 of the embodiment is higher than the B pillar 13 of the first comparative example having no reinforcing material, and the B pillar of the second comparative example having a reinforcing material of high tensile steel having a thickness of 1.8 mm. It turns out that it is equivalent to 13.

以上のように、本実施の形態によれば、厚さ０．８ｍｍ以上の連続炭素繊維層２２…を含む補強材１９により、厚さ１．８ｍｍ、引張強度９８０ＭＰａの高張力鋼の補強材と同等の耐荷重を得ることができるので、車体重量の増加を最小限に抑えながらＢピラー１３を効果的に補強することができる。しかも引張荷重が集中する場所だけに補強材１９を貼り付ければよいので、高価な炭素繊維の使用量を減らしてコストおよび重量の増加を最小限に抑えることができる。   As described above, according to the present embodiment, the reinforcing material 19 including the continuous carbon fiber layer 22... Having a thickness of 0.8 mm or more is used to reinforce a high-tensile steel reinforcing material having a thickness of 1.8 mm and a tensile strength of 980 MPa. Since an equivalent load capacity can be obtained, the B pillar 13 can be effectively reinforced while minimizing an increase in the weight of the vehicle body. In addition, since the reinforcing material 19 has only to be attached to the place where the tensile load is concentrated, the amount of expensive carbon fiber used can be reduced and the increase in cost and weight can be minimized.

このような構造の補強材１９は、上述したＢピラー１３のインナーパネル１８以外に、車体フレームの各部に取り付けることができる。   The reinforcing member 19 having such a structure can be attached to each part of the vehicle body frame other than the inner panel 18 of the B pillar 13 described above.

例えば、図１において、サイドシル１１の前後方向中央部の車幅方向内壁部に、連続炭素繊維２１…を前後方向に配向した連続炭素繊維層２２…を有する補強材１９を貼り付ければ、サイドシル１１に側面衝突の衝突荷重が入力して車幅方向内壁部に引張荷重が作用したときに、その引張荷重を補強材１９で支持してサイドシル１１の変形を最小限に抑えることができる。   For example, in FIG. 1, if the reinforcing material 19 having the continuous carbon fiber layers 22 with the continuous carbon fibers 21 oriented in the front-rear direction is attached to the inner wall of the side sill 11 in the vehicle width direction central portion, the side sill 11 When the impact load of the side impact is input to the inner wall portion in the vehicle width direction and the tensile load acts on the inner wall, the tensile load is supported by the reinforcing member 19 and the deformation of the side sill 11 can be minimized.

またフロントルーフアーチ１６の車幅方向両端部の下壁部に、連続炭素繊維２１…を車幅方向に配向した連続炭素繊維層２２…を有する補強材１９を貼り付ければ、車両が横転して車体上部から入力する荷重によりフロントルーフアーチ１６の下壁部に引張荷重が作用したときに、その引張荷重を補強材１９で支持してフロントルーフアーチ１６の変形を最小限に抑えることができる。   Further, if the reinforcing material 19 having the continuous carbon fiber layers 22 with the continuous carbon fibers 21 oriented in the vehicle width direction is attached to the lower wall portions of both ends of the front roof arch 16 in the vehicle width direction, the vehicle rolls over. When a tensile load acts on the lower wall portion of the front roof arch 16 due to a load input from the upper part of the vehicle body, the tensile load can be supported by the reinforcing material 19 to minimize deformation of the front roof arch 16.

また図１および図６から明らかなように、フロントルーフアーチ１６の車幅方向外端およびＡピラーアッパー１４の後端に接続されるルーフサイドレール１５は、アウターパネル２４およびインナーパネル２５をスチフナ２６を挟んで溶接した閉断面に構成され、インナーパネル２５の内壁部に連続炭素繊維層２２…を前後方向に配向した補強材１９が貼り付けられる。これにより、車両が横転して車体上部から入力する荷重によりルーフサイドレール１５の内壁部に引張荷重が作用したときに、その引張荷重を補強材１９で支持することで、Ａピラーアッパー１４の後端から後方に延びるルーフサイドレール１５の変形を最小限に抑えることができる。   As apparent from FIGS. 1 and 6, the roof side rail 15 connected to the outer end in the vehicle width direction of the front roof arch 16 and the rear end of the A pillar upper 14 connects the outer panel 24 and the inner panel 25 to the stiffener 26. The reinforcing material 19 is bonded to the inner wall of the inner panel 25 with the continuous carbon fiber layers 22 oriented in the front-rear direction. Thus, when a tensile load is applied to the inner wall portion of the roof side rail 15 due to the vehicle rolling over and input from the upper part of the vehicle body, the tensile load is supported by the reinforcing member 19, thereby The deformation of the roof side rail 15 extending rearward from the end can be minimized.

第２の実施の形態Second embodiment

次に、図７に基づいて本発明の第２の実施の形態を説明する。   Next, a second embodiment of the present invention will be described with reference to FIG.

第１の実施の形態では、Ｂピラー１３のインナーパネル１８と補強材１９とを発泡性接着剤２０を介して接着しているが、第２の実施の形態は、補強材１９の１０層のプリプレグのうち、Ｂピラー１３のインナーパネル１８に近い側の任意数のプリプレグの連続炭素繊維２１…に対する含浸樹脂（マトリクス樹脂）の比率を高くし、この含浸樹脂が熱硬化する際の接着力でインナーパネル１８に接着するものである。このように、プリプレグの含浸樹脂を接着剤として利用することで、特別の接着剤が不要になって製造コストが削減される。   In the first embodiment, the inner panel 18 of the B-pillar 13 and the reinforcing material 19 are bonded via the foamable adhesive 20, but the second embodiment has ten layers of the reinforcing material 19. Among the prepregs, the ratio of the impregnating resin (matrix resin) to the continuous carbon fibers 21 of any number of prepregs on the side close to the inner panel 18 of the B pillar 13 is increased, and the adhesive strength when the impregnating resin is thermally cured It adheres to the inner panel 18. In this way, by using the prepreg impregnated resin as an adhesive, a special adhesive is not required and the manufacturing cost is reduced.

以上、本発明の実施の形態を説明したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。   The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

例えば、実施の形態の補強材１９は８層の連続炭素繊維層２２…および２層の直交連続炭素繊維層２３，２３を備えているが、連続炭素繊維層２２…および直交連続炭素繊維層２３，２３の層数は実施の形態に限定されず、連続炭素繊維層２２…のトータルの厚さが０．８ｍｍ以上であれば高張力鋼の補強材と同等以上の補強効果を得ることができる。   For example, although the reinforcing material 19 of the embodiment includes eight continuous carbon fiber layers 22 and two orthogonal continuous carbon fiber layers 23 and 23, the continuous carbon fiber layers 22 and the orthogonal continuous carbon fiber layers 23 are provided. , 23 is not limited to the embodiment, and if the total thickness of the continuous carbon fiber layers 22 is 0.8 mm or more, a reinforcing effect equivalent to or higher than that of a high-strength steel reinforcing material can be obtained. .

また本発明が適用可能な中空フレームは、実施の形態のＢピラー１３、サイドシル１１およびフロントルーフアーチ１６に限定されるものではない。   Further, the hollow frame to which the present invention is applicable is not limited to the B pillar 13, the side sill 11, and the front roof arch 16 of the embodiment.

また実施の形態では補強材１９を中空フレームの車幅方向内壁部の外面（閉断面の外側面）に貼り付けているが、それを内面（閉断面の内側面）に貼り付けても良い。   In the embodiment, the reinforcing member 19 is attached to the outer surface (the outer surface of the closed section) of the inner wall portion in the vehicle width direction of the hollow frame, but it may be attached to the inner surface (the inner surface of the closed section).

また本発明のルーフアーチは、実施の形態のフロントルーフアーチ１６に限定されず、ミドルルーフアーチやリヤルーフアーチであっても良い。   The roof arch of the present invention is not limited to the front roof arch 16 of the embodiment, and may be a middle roof arch or a rear roof arch.

１１ サイドシル（中空フレーム）
１３ Ｂピラー（中空フレーム）
１６ フロントルーフアーチ（ルーフアーチあるいは中空フレーム）
１８ｂ 車幅方向内壁部（壁部）
１９ 補強材
２０ 発泡性接着剤
２２ 連続炭素繊維層
２３ 直交連続炭素繊維層 11 Side sill (hollow frame)
13 B pillar (hollow frame)
16 Front roof arch (roof arch or hollow frame)
18b Vehicle width direction inner wall (wall)
19 Reinforcing Material 20 Foamable Adhesive 22 Continuous Carbon Fiber Layer 23 Orthogonal Continuous Carbon Fiber Layer

Claims (5)

車体外部からの荷重の入力時に引張側となる金属製の中空フレーム（１１，１３，１６）の壁部（１８ｂ）にＣＦＲＰ製の補強材（１９）を接着する自動車の車体構造であって、
前記補強材（１９）は前記中空フレーム（１１，１３，１６）の長手方向に沿って配向された厚さが０．８ｍｍ以上の連続炭素繊維層（２２）を含むことを特徴とする自動車の車体構造。 A vehicle body structure for an automobile in which a CFRP reinforcing material (19) is bonded to a wall portion (18b) of a metal hollow frame (11, 13, 16) which becomes a tension side when a load is input from the outside of the vehicle body,
The reinforcing material (19) includes a continuous carbon fiber layer (22) having a thickness of 0.8 mm or more oriented along the longitudinal direction of the hollow frame (11, 13, 16). Body structure. 前記中空フレーム（１１，１３，１６）の壁部（１８ｂ）は、Ｂピラー（１３）の上下方向中間部の車幅方向内面、サイドシル（１１）の前後方向中間部の車幅方向内面あるいはルーフアーチ（１６）の車幅方向外端部の下面であることを特徴とする、請求項１に記載の自動車の車体構造。   The wall portion (18b) of the hollow frame (11, 13, 16) is an inner surface in the vehicle width direction at the intermediate portion in the vertical direction of the B pillar (13), an inner surface in the vehicle width direction in the intermediate portion in the front-rear direction of the side sill (11), or a roof. The vehicle body structure according to claim 1, wherein the arch (16) is a lower surface of an outer end portion in the vehicle width direction of the arch (16). 前記補強材（１９）は前記中空フレーム（１１，１３，１６）の長手方向に直交する方向に配向された直交連続炭素繊維層（２３）を含み、前記連続炭素繊維層（２２）は前記直交連続炭素繊維層より厚さを大きくし、前記連続炭素繊維層（２２）は前記直交連続炭素繊維層（２３）を挟んで厚さ方向に対称に配置されることを特徴とする、請求項１または請求項２に記載の自動車の車体構造。   The reinforcing material (19) includes an orthogonal continuous carbon fiber layer (23) oriented in a direction orthogonal to the longitudinal direction of the hollow frame (11, 13, 16), and the continuous carbon fiber layer (22) is orthogonal The thickness of the continuous carbon fiber layer is larger than that of the continuous carbon fiber layer, and the continuous carbon fiber layer (22) is disposed symmetrically in the thickness direction with the orthogonal continuous carbon fiber layer (23) interposed therebetween. The vehicle body structure according to claim 2. 前記補強材（１９）は前記中空フレーム（１１，１３，１６）の壁部（１８ｂ）に発泡性接着剤（２０）で接着されることを特徴とする、請求項１〜請求項３の何れか１項に記載の自動車の車体構造。   The reinforcing material (19) is bonded to the wall (18b) of the hollow frame (11, 13, 16) with a foamable adhesive (20), according to any one of claims 1 to 3. 2. A vehicle body structure according to claim 1. 前記中空フレーム（１１，１３，１６）の壁部（１８ｂ）に接着したＣＦＲＰの未硬化のプリプレグを乾燥炉の熱で硬化させることで前記補強材（１９）を成形することを特徴とする、請求項１〜請求項４の何れか１項に記載の自動車の車体構造。   The reinforcing material (19) is formed by curing an uncured CFRP prepreg bonded to the wall (18b) of the hollow frame (11, 13, 16) with heat from a drying furnace, The vehicle body structure according to any one of claims 1 to 4.
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