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JP6120460B2 - Automotive bumper - Google Patents

Automotive bumper Download PDF

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Publication number
JP6120460B2
JP6120460B2 JP2015550628A JP2015550628A JP6120460B2 JP 6120460 B2 JP6120460 B2 JP 6120460B2 JP 2015550628 A JP2015550628 A JP 2015550628A JP 2015550628 A JP2015550628 A JP 2015550628A JP 6120460 B2 JP6120460 B2 JP 6120460B2
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Japan
Prior art keywords
bumper beam
vehicle width
width direction
bumper
bottom wall
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JP2015550628A
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Japanese (ja)
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JPWO2015079876A1 (en
Inventor
重人 安原
重人 安原
柏木 正和
正和 柏木
裕介 前迫
裕介 前迫
忠行 内田
忠行 内田
朋也 彌武
朋也 彌武
潤一郎 荒木
潤一郎 荒木
健 中根
健 中根
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Publication of JPWO2015079876A1 publication Critical patent/JPWO2015079876A1/en
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Publication of JP6120460B2 publication Critical patent/JP6120460B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20Making multilayered or multicoloured articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24Arrangements for mounting bumpers on vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24Arrangements for mounting bumpers on vehicles
    • B60R19/26Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/34Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/30Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3044Bumpers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/1806Structural beams therefor, e.g. shock-absorbing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24Arrangements for mounting bumpers on vehicles
    • B60R2019/247Fastening of bumpers' side ends

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Body Structure For Vehicles (AREA)

Description

本発明は、W字状断面あるいはU字状断面を有するバンパービームを、不連続繊維を含む不連続繊維強化樹脂シートと、連続繊維を含む連続繊維強化樹脂シートとを積層して構成した自動車用バンパーに関する。   The present invention is for an automobile in which a bumper beam having a W-shaped cross section or a U-shaped cross section is formed by laminating a discontinuous fiber reinforced resin sheet containing discontinuous fibers and a continuous fiber reinforced resin sheet containing continuous fibers. Regarding bumpers.

前方あるいは後方に向けて開放するU字状断面あるいはW字状断面を有する繊維強化樹脂製のバンパービームにおいて、前後方向の衝突荷重が入力したときにバンパービームが口開き変形するのを防止することで、バンパービームの強度を高めて衝突エネルギーの吸収性能の向上を図るものが種々提案されている。   In a bumper beam made of a fiber reinforced resin having a U-shaped cross section or a W-shaped cross section that opens toward the front or the rear, the bumper beam is prevented from opening and deforming when a collision load in the front-rear direction is input. Various proposals have been made to improve the impact energy absorption performance by increasing the strength of the bumper beam.

例えば、下記特許文献1には、前方に向けて開放するW字状断面のバンパービームの内部に縦方向および横方向にリブを形成するとともに、バンパーフェイスの内面をバンパービームの前端に溶融樹脂で結合したものが提案されている。   For example, in Patent Document 1 below, ribs are formed in the vertical and horizontal directions inside a bumper beam having a W-shaped cross section that opens forward, and the inner surface of the bumper face is made of molten resin at the front end of the bumper beam. A combination is proposed.

また下記特許文献2には、熱可塑性樹脂と連続繊維を含む樹脂シートとを重ねてプレス成形することで後方に向けて開放するW字状断面のバンパービームを構成し、W字状断面の上下の端部に熱可塑性樹脂あるいは連続繊維を含む樹脂シートを追加して局部的に板厚を増加させたものが提案されている。   In Patent Document 2 below, a bumper beam having a W-shaped cross section that is opened rearward by press-molding a thermoplastic resin and a resin sheet containing continuous fibers is formed. A sheet having a thickness increased locally by adding a resin sheet containing a thermoplastic resin or continuous fibers to the end of the sheet has been proposed.

また下記特許文献3には、前方に向けて開放するU字状断面のバンパービームの内部に縦補強リブおよび斜め補強リブを形成したものが提案されている。   Patent Document 3 below proposes a U-shaped cross-section bumper beam that opens toward the front, in which longitudinal reinforcing ribs and diagonal reinforcing ribs are formed.

また下記特許文献4には、連続繊維を含む樹脂シートと不連続繊維を含む樹脂シートとを重ね合わせてプレス成形することで前方に向けて開放するU字状断面のバンパービームを構成し、その内部に不連続繊維を含む樹脂シートよりなる縦リブおよび横リブを形成したものが提案されている。   Moreover, in the following Patent Document 4, a bumper beam having a U-shaped cross section that opens toward the front by forming a resin sheet containing continuous fibers and a resin sheet containing discontinuous fibers and press-molding them is configured. Proposals have been made in which longitudinal ribs and transverse ribs made of a resin sheet containing discontinuous fibers are formed.

また下記特許文献5には、前方に向けて開放するU字状断面のバンパービームの内部に縦方向に延びる多数のリブを形成するとともに、その後端の縦壁部に車幅方向に延びる多数ビ−ドを形成したものが提案されている。   In Patent Document 5 below, a large number of ribs extending in the vertical direction are formed inside a bumper beam having a U-shaped cross section that opens forward, and a large number of ribs extending in the vehicle width direction are formed on the vertical wall portion at the rear end. -Proposals have been made that form

日本特開平3−224850号公報Japanese Unexamined Patent Publication No. 3-224850 日本特表2000−515828号公報Japan Special Table 2000-515828 日本特許第3229568号公報Japanese Patent No. 3229568 国際公開第WO2013094515号公報International Publication No. WO20130394515 日本特開平3−227750号公報Japanese Unexamined Patent Publication No. 3-227750

しかしながら、上記各特許文献に記載されたものは、バンパービームの内部に多数のリブを形成することで強度を高めるものであり、バンパービームの曲げ強度を左右する各部の板厚分布を考慮していないため、重量が増加する割には充分な強度向上が得られないという問題があった。   However, those described in each of the above patent documents increase the strength by forming a large number of ribs inside the bumper beam, and consider the thickness distribution of each part that affects the bending strength of the bumper beam. Therefore, there is a problem that sufficient strength improvement cannot be obtained for the increase in weight.

上記特許文献1、4及び5に記載されたものは、衝突荷重の入力時にバンパービームが口開き変形するのを防止するためには縦方向のリブを車幅方向に短い間隔で多数形成する必要があり、繊維強化樹脂が連続繊維層を有する場合には成形が困難であるばかりか、重量が増加してバンパービームを繊維強化樹脂製としたメリットを活かすことができないという問題があった。   In the above-mentioned Patent Documents 1, 4 and 5, it is necessary to form a large number of longitudinal ribs at short intervals in the vehicle width direction in order to prevent the bumper beam from opening and deforming when a collision load is input. In the case where the fiber reinforced resin has a continuous fiber layer, not only is the molding difficult, but there is a problem that the weight is increased and the advantage of using the bumper beam made of the fiber reinforced resin cannot be utilized.

また上記特許文献2に記載されたものは、W字状断面を有するバンパービームの底壁が前方を向いているため、衝突荷重の入力によりバンパービームが後方に湾曲したとき、バンパービームの後面に作用する引張荷重を車幅方向に延びる底壁の連続繊維層で支持することができず、曲げ荷重に対するバンパービームの強度が著しく低下するという問題があった。   Further, in the above-mentioned Patent Document 2, since the bottom wall of the bumper beam having a W-shaped cross section faces the front, when the bumper beam is bent backward by the input of the collision load, the bumper beam is formed on the rear surface of the bumper beam. The acting tensile load cannot be supported by the continuous fiber layer of the bottom wall extending in the vehicle width direction, and there is a problem that the strength of the bumper beam against the bending load is remarkably reduced.

本発明は前述の事情に鑑みてなされたもので、重量の増加を最小限に抑えながらバンパービームの口開き変形を防止して曲げ強度を高めることを目的とする。   The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent bending deformation of a bumper beam and increase bending strength while minimizing an increase in weight.

上記目的を達成するために、本発明によれば、W字状断面あるいはU字状断面を有するとともに、不連続繊維を含む不連続繊維強化樹脂シートと、連続繊維を含む連続繊維強化樹脂シートとを積層して構成されたバンパービームが、車幅方向外側に位置して衝撃吸収部材に接続される左右一対の衝撃吸収部材接続部と、該衝撃吸収部材接続部の車幅方向内側に位置して前記バンパービームのうちで前後方向外側に最も突出する左右一対の荷重入力部とを備えてなる自動車用バンパーであって、前記バンパービームは、垂直に位置する底壁と、前記底壁の上下両端から水平方向に延びる側壁とを備え、前記底壁の板厚は前記側壁の板厚よりも大きく、前記左右の荷重入力部の前後方向外側に最も突出する先端に衝突荷重が入力したとき、それら左右の荷重入力部の先端間に作用する曲げモーメントが一定の最大値となり、そこから車幅方向外側に向かって次第に減少することで前記衝撃吸収部材接続部の変形中心において前記曲げモーメントが最小値となるのに対応して、前記曲げモーメントが大きい部分では前記板厚が大きくなり、前記曲げモーメントが小さい部分では前記板厚が小さくなるように、衝突荷重により前記バンパービームに作用する曲げモーメントの分布に応じて前記底壁の板厚を車幅方向に変化させたことを第1の特徴とする自動車用バンパーが提案される。 To achieve the above object, according to the present invention, which has a W-shaped cross section or a U-shaped cross section, and a discontinuous fiber reinforced resin sheet comprising discontinuous fibers, and continuous fiber-reinforced resin sheet comprising continuous fibers A bumper beam formed by laminating a pair of left and right shock absorbing member connecting portions positioned on the outer side in the vehicle width direction and connected to the shock absorbing member is positioned on the inner side in the vehicle width direction of the shock absorbing member connecting portion. The bumper beam includes a pair of left and right load input portions that protrude most outward in the front-rear direction , and the bumper beam includes a bottom wall that is positioned vertically and upper and lower sides of the bottom wall. and a side wall extending in a horizontal direction from both ends, wherein the thickness of the bottom wall much larger than the thickness of the side wall, when the collision load before and after the tip of the most projecting toward the outside of the left and right load input portion is input They The bending moment acting between the tip ends of the right load input portion becomes a certain maximum value, and gradually decreases from there to the outside in the vehicle width direction, so that the bending moment becomes the minimum value at the deformation center of the shock absorbing member connecting portion. Correspondingly, the thickness of the bending moment acting on the bumper beam by the collision load is increased so that the plate thickness is increased at the portion where the bending moment is large and the thickness is decreased at the portion where the bending moment is small. There is proposed an automobile bumper characterized in that the thickness of the bottom wall is changed in the vehicle width direction according to the distribution .

また本発明によれば、前記第1の特徴に加えて、前記底壁の連続繊維強化樹脂シートに第2の連続繊維強化樹脂シートを積層することで、前記底壁の板厚を前記側壁の板厚よりも大きくしたことを第2の特徴とする自動車用バンパーが提案される。   According to the invention, in addition to the first feature, by laminating the second continuous fiber reinforced resin sheet on the continuous fiber reinforced resin sheet on the bottom wall, the thickness of the bottom wall can be reduced by the thickness of the side wall. A bumper for automobiles is proposed which has a second feature that it is larger than the plate thickness.

また本発明によれば、前記第1の特徴に加えて、前記底壁の不連続繊維強化樹脂シートを前記側壁の不連続繊維強化樹脂シートよりも厚くすることで、前記底壁の板厚を前記側壁の板厚よりも大きくしたことを第3の特徴とする自動車用バンパーが提案される According to the present invention, in addition to the first feature, the bottom wall has a discontinuous fiber reinforced resin sheet thicker than the discontinuous fiber reinforced resin sheet on the side wall, thereby reducing the thickness of the bottom wall. A bumper for automobiles is proposed in which the thickness is larger than the thickness of the side wall .

た本発明によれば、前記第1の特徴に加えて、前記バンパービームは、車幅方向中央部において前後方向外側に向けて凹状に湾曲する中央湾曲部と、前記中央湾曲部の車幅方向両側において前後方向外側に向けて凸状に湾曲する一対の左右湾曲部とからなり、前記左右湾曲部は、前記衝撃吸収部材接続部と前記荷重入力部とを備えることを第の特徴とする自動車用バンパーが提案される。 According to or present invention, in addition to said first aspect, the bumper beam includes a central curved portion which is curved concavely towards the longitudinal direction outside in the vehicle width direction central portion, a vehicle width of the central bending portion consists of a pair of left and right curved portion convexly curved towards the front-rear direction outside in both sides, the right and left curved portion, that obtain Bei a front Symbol shock absorbing member connecting portion and the front Symbol load input portion 4 A bumper for automobiles is proposed.

また本発明によれば、前記第の特徴に加えて、前記バンパービームは上部フランジを前後方向内側に折り返した上部折り返し部と下部フランジを前後方向内側に折り返した下部折り返し部とを備え、前記バンパービームエクステンション接続部は少なくとも車幅方向内側の締結点および車幅方向外側の締結点で前記バンパービームエクステンションの本体部に締結され、前記上部折り返し部および前記下部折り返し部の車幅方向外端は前記車幅方向内側の締結点の近傍を終端とすることを第の特徴とする自動車用バンパーが提案される。 According to the present invention, in addition to the fourth feature, the bumper beam includes an upper folded portion in which an upper flange is folded inward in the front-rear direction and a lower folded portion in which the lower flange is folded inward in the front-rear direction, The bumper beam extension connection portion is fastened to the body portion of the bumper beam extension at least at a fastening point on the inner side in the vehicle width direction and a fastening point on the outer side in the vehicle width direction, and the outer ends in the vehicle width direction of the upper folded portion and the lower folded portion are A bumper for an automobile having a fifth feature that the vicinity of the fastening point on the inner side in the vehicle width direction ends is proposed.

尚、実施の形態のバンパービームエクステンション12は本発明の衝撃吸収部材に対応し、実施の形態の上壁14bおよび下壁14cは本発明の側壁に対応し、実施の形態のリベット35は本発明の締結点に対応し、実施の形態のバンパービームエクステンション接続部B1は本発明の衝撃吸収部材接続部に対応する。   The bumper beam extension 12 of the embodiment corresponds to the shock absorbing member of the present invention, the upper wall 14b and the lower wall 14c of the embodiment correspond to the side wall of the present invention, and the rivet 35 of the embodiment corresponds to the present invention. The bumper beam extension connection portion B1 of the embodiment corresponds to the shock absorbing member connection portion of the present invention.

本発明の第1の特徴によれば、自動車用バンパーは、W字状断面あるいはU字状断面を有するバンパービームが、不連続繊維を含む不連続繊維強化樹脂シートと、連続繊維強化樹脂シートとを積層して構成される。   According to a first aspect of the present invention, a bumper for an automobile includes a discontinuous fiber reinforced resin sheet in which a bumper beam having a W-shaped cross section or a U-shaped cross section includes discontinuous fibers, and a continuous fiber reinforced resin sheet. It is constituted by laminating.

バンパービームは、垂直に位置する底壁と、底壁の上下両端から水平方向に延びる側壁とを備え、底壁の板厚は側壁の板厚よりも大きいので、重量の増加を最小限に抑えながら水平方向の曲げ変形に対するバンパービームの剛性を効率良く高め、衝突エネルギーの吸収性能の向上を図ることができる。   The bumper beam has a bottom wall that is positioned vertically and side walls that extend horizontally from the upper and lower ends of the bottom wall, and the thickness of the bottom wall is greater than the thickness of the side walls, thus minimizing the increase in weight. However, it is possible to efficiently increase the rigidity of the bumper beam against horizontal bending deformation and improve the impact energy absorption performance.

また、衝突荷重によりバンパービームに作用する曲げモーメントの分布に応じて底壁の板厚を車幅方向に変化させたので、バンパービームの車幅方向の強度分布を最適化して軽量化を図ることができる。In addition, since the thickness of the bottom wall is changed in the vehicle width direction according to the distribution of the bending moment acting on the bumper beam due to the collision load, the weight distribution in the vehicle width direction of the bumper beam is optimized to reduce the weight. Can do.

また本発明の第2の特徴によれば、底壁の連続繊維強化樹脂シートに第2の連続繊維強化樹脂シートを積層することで、底壁の板厚を側壁の板厚よりも大きくしたので、連続繊維の量を増加させて引張荷重に対する強度を高めることができる。   According to the second feature of the present invention, the thickness of the bottom wall is made larger than the thickness of the side wall by laminating the second continuous fiber reinforced resin sheet on the continuous fiber reinforced resin sheet on the bottom wall. The strength against tensile load can be increased by increasing the amount of continuous fibers.

また本発明の第3の特徴によれば、底壁の不連続繊維強化樹脂シートを側壁の不連続繊維強化樹脂シートよりも厚くすることで、底壁の板厚を側壁の板厚よりも大きくしたので、不連続繊維の量を増加させて圧縮荷重に対する強度を高めることができる According to the third aspect of the present invention, the bottom wall has a discontinuous fiber reinforced resin sheet thicker than the side wall discontinuous fiber reinforced resin sheet, so that the bottom wall has a thickness greater than that of the side wall. Therefore, the strength against compressive load can be increased by increasing the amount of discontinuous fibers .

た本発明の第の特徴によれば、バンパービームは、車幅方向中央部において前後方向外側に向けて凹状に湾曲する中央湾曲部と、中央湾曲部の車幅方向両側において前後方向外側に向けて凸状に湾曲する一対の左右湾曲部とからなり、左右湾曲部は、車幅方向外側に位置してバンパービームエクステンションに接続されるバンパービームエクステンション接続部と、車幅方向内側に位置してバンパービームのうちで前後方向外側に最も突出する荷重入力部とを備えるので、前後方向の衝突荷重を左右一対の荷重入力部で受けることで、荷重が入力する荷重入力部からバンパービームエクステンション接続部までの距離を小さくして衝突荷重によりバンパービームに作用する曲げモーメントを小さくし、バンパービームの必要強度を低減して軽量化を図ることができる。 According to a fourth aspect of the or invention, bumper beam includes a central curved portion which is curved concavely towards the longitudinal direction outside in the vehicle width direction central portion, front and rear outward in the vehicle width direction on both sides of the central bending portion The left and right curved parts are located on the outer side in the vehicle width direction and connected to the bumper beam extension, and on the inner side in the vehicle width direction. Since the bumper beam has a load input part that protrudes most outward in the front-rear direction, it receives the collision load in the front-rear direction by the pair of left and right load input parts. By reducing the distance to the connecting part, the bending moment acting on the bumper beam due to collision load is reduced, reducing the required strength of the bumper beam. It is possible to reduce the weight.

また本発明の第の特徴によれば、バンパービームは上部フランジを前後方向内側に折り返した上部折り返し部と下部フランジを前後方向内側に折り返した下部折り返し部とを備えるので、衝突荷重によりバンパービームが口開き変形するのを特別の補強リブ等を設けることなく防止し、口開き変形した部分の車幅方向両側に応力が集中して亀裂や破壊が発生するのを防止することができる。 According to the fifth aspect of the present invention, the bumper beam includes an upper folded portion in which the upper flange is folded inward in the front-rear direction and a lower folded portion in which the lower flange is folded inward in the front-rear direction. Can be prevented without providing a special reinforcing rib or the like, and it is possible to prevent cracks and breakage due to stress concentration on both sides in the vehicle width direction of the mouth deformed portion.

しかもバンパービームエクステンション接続部は少なくとも車幅方向内側の締結点および車幅方向外側の締結点でバンパービームエクステンションの本体部に締結され、上部折り返し部および下部折り返し部の車幅方向外端は車幅方向内側の締結点の近傍を終端とするので、前後方向の衝突荷重が入力したときにバンパービームの車幅方向外側の締結点によりバンパービームエクステンションからバンパービームに前後方向内向きの反力を作用させることで、バンパービームに作用する曲げモーメントの最大値を低減して局部的な破壊を防止することができる。   In addition, the bumper beam extension connecting portion is fastened to the bumper beam extension body at least at the fastening point on the inner side in the vehicle width direction and the fastening point on the outer side in the vehicle width direction, and the outer end in the vehicle width direction of the upper folded portion and the lower folded portion is the vehicle width. Because the front end is near the fastening point on the inner side in the direction, when a collision load in the front / rear direction is input, a reaction force inward in the front / rear direction is applied from the bumper beam extension to the bumper beam by the fastening point on the outer side in the vehicle width direction of the bumper beam. By doing so, the maximum value of the bending moment acting on the bumper beam can be reduced to prevent local destruction.

その際に、折り返し部の車幅方向外端は車幅方向内側の締結点の近傍を終端とするので、折り返し部が形成されないバンパービームの車幅方向外端部の剛性を低下させることで、車幅方向外側の締結点からバンパービームエクステンションに作用する前後方向外向きの荷重が過大になるのを防止し、バンパービームエクステンションの前後方向の圧壊が阻害されるのを回避することができる。   At that time, since the outer end in the vehicle width direction of the folded portion ends in the vicinity of the fastening point on the inner side in the vehicle width direction, by reducing the rigidity of the outer end portion in the vehicle width direction of the bumper beam where the folded portion is not formed, It is possible to prevent the outward load in the front-rear direction acting on the bumper beam extension from the fastening point on the outer side in the vehicle width direction from being excessive, and to prevent the crushing of the bumper beam extension in the front-rear direction.

図1はバンパービームおよびバンパービームエクステンションの斜視図である。(第1の実施の形態)FIG. 1 is a perspective view of a bumper beam and a bumper beam extension. (First embodiment) 図2は図1の2方向矢視図である。(第1の実施の形態)FIG. 2 is a view in the direction of the arrow 2 in FIG. (First embodiment) 図3は図2の3−3線拡大断面図である。(第1の実施の形態)3 is an enlarged sectional view taken along line 3-3 in FIG. (First embodiment) 図4は図3の4部拡大図である。(第1の実施の形態)FIG. 4 is an enlarged view of part 4 of FIG. (First embodiment) 図5は図2の5−5線拡大断面図である。(第1の実施の形態)FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. (First embodiment) 図6は図2の6−6線拡大断面図である。(第1の実施の形態)6 is an enlarged sectional view taken along line 6-6 of FIG. (First embodiment) 図7はバンパービームを成形する金型の断面図である。(第1の実施の形態)FIG. 7 is a cross-sectional view of a mold for forming a bumper beam. (First embodiment) 図8は図4に対応する図である。(第2の実施の形態)FIG. 8 corresponds to FIG. (Second Embodiment) 図9はバンパービームおよびバンパービームエクステンションの斜視図である。(第3の実施の形態)FIG. 9 is a perspective view of the bumper beam and the bumper beam extension. (Third embodiment) 図10は図9の10方向矢視図である。(第3の実施の形態)FIG. 10 is a view in the direction of arrow 10 in FIG. (Third embodiment) 図11は図9の11方向拡大矢視図である。(第3の実施の形態)11 is an enlarged view in the 11 direction of FIG. (Third embodiment) 図12は図11の12−12線拡大断面図である。(第3の実施の形態)12 is an enlarged sectional view taken along line 12-12 of FIG. (Third embodiment) 図13は図11の13−13線拡大断面図である。(第3の実施の形態)13 is an enlarged sectional view taken along line 13-13 of FIG. (Third embodiment) 図14は図11の14−14線拡大断面図である。(第3の実施の形態)14 is an enlarged sectional view taken along line 14-14 of FIG. (Third embodiment) 図15は図11の15−15線拡大断面図である。(第3の実施の形態)FIG. 15 is an enlarged sectional view taken along line 15-15 of FIG. (Third embodiment) 図16はバンパービームを成形する金型の断面図である。(第3の実施の形態)FIG. 16 is a cross-sectional view of a mold for forming a bumper beam. (Third embodiment) 図17は衝突荷重によりバンパービームに作用する曲げモーメントの説明図である。(第3の実施の形態)FIG. 17 is an explanatory diagram of the bending moment acting on the bumper beam due to the collision load. (Third embodiment) 図18は図12に対応する図である。(第4の実施の形態)FIG. 18 corresponds to FIG. (Fourth embodiment)

11 バンパービーム
12 バンパービームエクステンション(衝撃吸収部材)
14a 底壁
14b 上壁(側壁)
14c 下壁(側壁)
14d 上部フランジ
14e 下部フランジ
14g 上部折り返し部
14h 下部折り返し部
15 連続繊維強化樹脂シート
16 不連続繊維強化樹脂シート
17 第2の連続繊維強化樹脂シート
33a′ 本体部
35 リベット(締結点)
A 中央湾曲部
B 左右湾曲部
B1 バンパービームエクステンション接続部(衝撃吸収部材接続部)
B2 荷重入力部
T1 底壁の板厚
T2 側壁の板厚
11 Bumper beam 12 Bumper beam extension (shock absorbing member)
14a Bottom wall 14b Top wall (side wall)
14c Lower wall (side wall)
14d Upper flange 14e Lower flange 14g Upper folded part 14h Lower folded part 15 Continuous fiber reinforced resin sheet 16 Discontinuous fiber reinforced resin sheet 17 Second continuous fiber reinforced resin sheet 33a 'Main body 35 Rivet (fastening point)
A Central curved part B Left and right curved part B1 Bumper beam extension connection part (shock absorbing member connection part)
B2 Load input part T1 Thickness of bottom wall T2 Thickness of side wall

以下、添付図面に基づいて本発明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)および上下方向とは、運転席に着座した乗員を基準として定義される。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 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.

第1の実施の形態First embodiment

先ず、図1〜図7に基づいて本発明の第1の実施の形態を説明する。   First, a first embodiment of the present invention will be described with reference to FIGS.

図1〜図3に示すように、自動車の車体前部に繊維強化樹脂製のバンパービーム11が車幅方向に配置されており、バンパービーム11の車幅方向両端部が繊維強化樹脂製の左右一対のバンパービームエクステンション12,12の前端に支持され、バンパービームエクステンション12,12の後端が左右一対の金属製のフロントサイドフレーム13,13の前端に支持される。   As shown in FIGS. 1 to 3, bumper beams 11 made of fiber reinforced resin are arranged in the vehicle width direction at the front of the vehicle body, and both ends of the bumper beam 11 in the vehicle width direction are made of fiber reinforced resin. The bumper beam extensions 12 and 12 are supported at the front ends of the pair of bumper beam extensions 12 and 12, and the rear ends of the bumper beam extensions 12 and 12 are supported at the front ends of the pair of left and right metal front side frames 13 and 13.

バンパービーム11は、前方に向けて開放するU字状断面の上ビーム部14Uおよび下ビーム部14Lを上下に結合したW字状断面の部材であり、上ビーム部14Uおよび下ビーム部14Lは、後端に位置する底壁14aと、底壁14aの上端から前方に延びる上壁14bと、底壁14aの下端から前方に延びる下壁14cと、上ビーム部14Uの上壁14bの前端から上方に延びる上部フランジ14dと、下ビーム部14Lの下壁14cの前端から下方に延びる下部フランジ14eと、上ビーム部14Uの下壁14cおよび下ビーム部14Lの上壁14bを上下方向に接続する中間フランジ14fとを備える。   The bumper beam 11 is a member having a W-shaped cross section in which an upper beam section 14U and a lower beam section 14L, which are U-shaped cross sections that are open toward the front, are vertically coupled. The upper beam section 14U and the lower beam section 14L are A bottom wall 14a located at the rear end, an upper wall 14b extending forward from the upper end of the bottom wall 14a, a lower wall 14c extending forward from the lower end of the bottom wall 14a, and upward from the front end of the upper wall 14b of the upper beam portion 14U An upper flange 14d extending downward, a lower flange 14e extending downward from the front end of the lower wall 14c of the lower beam portion 14L, and an intermediate connecting the lower wall 14c of the upper beam portion 14U and the upper wall 14b of the lower beam portion 14L in the vertical direction. And a flange 14f.

バンパービーム11は、車幅方向中央の所定範囲において前方に向けて凹状に湾曲する中央湾曲部Aと、中央湾曲部Aの車幅方向両側において前方に向けて凸状に湾曲する一対の左右湾曲部B,Bとからなり、左右湾曲部Bは、車幅方向外側に位置してバンパービームエクステンション12に接続されるバンパービームエクステンション接続部B1と、車幅方向内側に位置してバンパービーム11のうちで前方に最も突出する荷重入力部B2とを備える。   The bumper beam 11 has a central curved portion A that curves concavely toward the front in a predetermined range in the center in the vehicle width direction, and a pair of left and right curved curves curved convexly toward the front on both sides of the central curved portion A in the vehicle width direction. The left and right curved portion B is formed of a bumper beam extension connecting portion B1 which is located on the outer side in the vehicle width direction and connected to the bumper beam extension 12, and an inner side in the vehicle width direction. And a load input portion B2 that protrudes most forward.

またバンパービームエクステンション接続部B1の上ビーム部14Uおよび下ビーム部14Lの車幅方向中間部は、それぞれ上壁14b、底壁14aおよび下壁14cを接続するように上下方向かつ前後方向に延びる2枚の縦リブ14j,14jを備えるとともに、上ビーム部14Uおよび下ビーム部14Lの車幅方向外端部は、それぞれ上壁14b、底壁14aおよび下壁14cを接続するように上下方向かつ前後方向に延びる1枚の端壁14kを備える。尚、バンパービーム11の車幅方向内側の縦リブ14j…から端壁14k…までの間には、上部フランジ14d,14dおよび下部フランジ14e,14eは形成されていない(図1参照)。   Further, the vehicle width direction intermediate portions of the upper beam portion 14U and the lower beam portion 14L of the bumper beam extension connection portion B1 extend in the vertical direction and the front-rear direction so as to connect the upper wall 14b, the bottom wall 14a, and the lower wall 14c, respectively. In addition to the vertical ribs 14j and 14j, the outer end portions in the vehicle width direction of the upper beam portion 14U and the lower beam portion 14L are connected to the upper wall 14b, the bottom wall 14a, and the lower wall 14c in the vertical direction and in the front-rear direction. One end wall 14k extending in the direction is provided. The upper flanges 14d and 14d and the lower flanges 14e and 14e are not formed between the longitudinal ribs 14j on the inner side in the vehicle width direction of the bumper beam 11 and the end walls 14k (see FIG. 1).

バンパービーム11の車幅方向中央部には金属製のカバー部材31が装着される。カバー部材31は、矩形状の本体部31aと、本体部31aの上下端を後方に折り曲げた係止部31b,31cを備えており、本体部31aの上部および下部がバンパービーム11の上部フランジ14dおよび下部フランジ14eにそれぞれリベット32…で固定される。これにより、本体部31aの上端の係止部31bがバンパービーム11の上部フランジ14dに上方から係合し、本体部31aの下端の係止部31cがバンパービーム11の下部フランジ14eに下方から係合する。   A metal cover member 31 is attached to the center of the bumper beam 11 in the vehicle width direction. The cover member 31 includes a rectangular main body portion 31a and locking portions 31b and 31c obtained by bending the upper and lower ends of the main body portion 31a rearward. The upper and lower portions of the main body portion 31a are upper flanges 14d of the bumper beam 11. And are fixed to the lower flange 14e by rivets 32, respectively. As a result, the locking portion 31b at the upper end of the main body 31a engages with the upper flange 14d of the bumper beam 11 from above, and the locking portion 31c at the lower end of the main body 31a engages with the lower flange 14e of the bumper beam 11 from below. Match.

バンパービーム11は、後面側に位置する連続繊維強化樹脂シート15と、前面側に位置する不連続繊維強化樹脂シート16とを2層に積層して構成される。連続繊維強化樹脂シート15は、車幅方向に配向したガラス連続繊維と、それと直交する上下方向あるいは前後方向に配向したガラス連続繊維とよりなる織布をナイロン樹脂で固めたものであり、不連続繊維強化樹脂シート16は、ランダムに配向されて相互に絡み合うガラス不連続繊維をナイロン樹脂で固めたものである。   The bumper beam 11 is configured by laminating a continuous fiber reinforced resin sheet 15 located on the rear side and a discontinuous fiber reinforced resin sheet 16 located on the front side in two layers. The continuous fiber reinforced resin sheet 15 is obtained by consolidating a woven fabric composed of continuous glass fibers oriented in the vehicle width direction and continuous glass fibers oriented in the vertical direction or the front-rear direction orthogonal thereto with a nylon resin. The fiber reinforced resin sheet 16 is obtained by hardening glass discontinuous fibers that are randomly oriented and intertwined with each other with a nylon resin.

図7に示すように、バンパービーム11をプレス成形する金型21は、連続繊維強化樹脂シート15の後面を成形する凹状のキャビティ22a,22aを有する雌型22と、不連続繊維強化樹脂シート16の前面を成形する凸状のコア23a,23aを有する雄型23とからなり、コア23a,23aには縦リブ14j…および端壁14k…を成形するための溝23b…が形成される。金型21を型開きした状態で、雌型22のキャビティ22a,22aおよび雄型23のコア23a,23a間に、連続繊維プリプレグ15′と不連続繊維プリプレグ16′とが予備加熱した状態で配置される。   As shown in FIG. 7, the mold 21 for press-molding the bumper beam 11 includes a female mold 22 having concave cavities 22 a and 22 a for molding the rear surface of the continuous fiber reinforced resin sheet 15, and a discontinuous fiber reinforced resin sheet 16. Are formed with male cores 23 having convex cores 23a, 23a, and grooves 23b for forming vertical ribs 14j and end walls 14k are formed in the cores 23a, 23a. With the mold 21 opened, the continuous fiber prepreg 15 ′ and the discontinuous fiber prepreg 16 ′ are disposed between the cavities 22 a and 22 a of the female mold 22 and the cores 23 a and 23 a of the male mold 23 in a preheated state. Is done.

このとき、バンパービーム11の底壁14a,14aに対応する部分に、細幅の帯状に形成された第2の連続繊維プリプレグ17′,17′が、連続繊維プリプレグ15′および不連続繊維プリプレグ16′間に挟まれるように配置される。   At this time, the second continuous fiber prepregs 17 ′ and 17 ′ formed in a narrow strip shape at the portions corresponding to the bottom walls 14 a and 14 a of the bumper beam 11 are the continuous fiber prepreg 15 ′ and the discontinuous fiber prepreg 16. It arrange | positions so that it may be pinched | interposed.

プリプレグは、カーボンファイバー、グラスファイバー、アラミドファイバー等の連続繊維よりなる平織や綾織などの織布やUD(連続繊維を一方向に引き揃えたシート)、あるいは不連続繊維のマットを補強材とし、それに半硬化の熱硬化性樹脂(エポキシ樹脂やポリエステル樹脂等)、あるいは熱可塑性樹脂(ナイロン6やポリプロピレン等の)を含浸させたもので、金型の形状になじむ柔軟性を有している。熱硬化性樹脂の場合、複数枚のプリプレグを積層状態で金型内に挿入して圧力を加えながら例えば130°C程度に加熱すると、熱硬化性樹脂が硬化して繊維強化樹脂製品が得られる。本実施の形態の可塑性樹脂の場合、予備加熱した複数枚のプリプレグを積層状態で金型内に挿入して加圧成形し、その後冷却すると繊維強化樹脂製品が得られる。   The prepreg is made of woven fabric such as plain weave and twill weave made of continuous fibers such as carbon fiber, glass fiber and aramid fiber, UD (sheet in which continuous fibers are aligned in one direction), or a mat of discontinuous fibers as a reinforcing material. It is impregnated with a semi-cured thermosetting resin (such as an epoxy resin or a polyester resin) or a thermoplastic resin (such as nylon 6 or polypropylene), and has flexibility to adapt to the shape of the mold. In the case of a thermosetting resin, when a plurality of prepregs are inserted into a mold in a laminated state and heated to, for example, about 130 ° C. while applying pressure, the thermosetting resin is cured and a fiber reinforced resin product is obtained. . In the case of the plastic resin according to the present embodiment, a plurality of preheated prepregs are inserted into a mold in a laminated state, subjected to pressure molding, and then cooled to obtain a fiber reinforced resin product.

本実施の形態では、連続繊維プリプレグ15′および第2の連続繊維プリプレグ17′,17′の補強材は、ガラス連続繊維を相互に直交する方向に配向した織布であり、不連続繊維プリプレグ16′の補強材は、ランダム配向した繊維長が5mm程度の長繊維からなるガラス不連続繊維の不織布である。   In the present embodiment, the reinforcing material of the continuous fiber prepreg 15 ′ and the second continuous fiber prepregs 17 ′ and 17 ′ is a woven fabric in which the continuous glass fibers are oriented in directions orthogonal to each other, and the discontinuous fiber prepreg 16. The reinforcing material of ′ is a nonwoven fabric of glass discontinuous fibers composed of long fibers having a randomly oriented fiber length of about 5 mm.

従って、雌型22および雄型23を型締めすると、連続繊維プリプレグ15′および第2の連続繊維プリプレグ17′,17′が雌型22のキャビティ22a,22aと雄型23のコア23a,23aとによってプレスされ、W字状断面を有するバンパービーム11の後面が成形される。このとき、不連続繊維プリプレグ16′は容易に変形可能であるため、連続繊維プリプレグ15′および第2の連続繊維プリプレグ17′,17′と雄型23のコア23a,23aとによって挟まれた不連続繊維プリプレグ16′は、連続繊維プリプレグ15′および第2の連続繊維プリプレグ17′,17′の前面に沿って薄い膜状に積層されるとともに、コア23a,23aの溝23b…内に流入して縦リブ14j…および端壁14k…を同時に成形する。そして金型21から取り出したバンパービーム11の外周にはみ出した余剰部分を切断することで、バンパービーム11を完成する。   Accordingly, when the female mold 22 and the male mold 23 are clamped, the continuous fiber prepreg 15 ′ and the second continuous fiber prepregs 17 ′ and 17 ′ become the cavities 22 a and 22 a of the female mold 22 and the cores 23 a and 23 a of the male mold 23. And the rear surface of the bumper beam 11 having a W-shaped cross section is formed. At this time, since the discontinuous fiber prepreg 16 ′ can be easily deformed, the non-continuous fiber prepreg 15 ′ and the second continuous fiber prepreg 17 ′, 17 ′ and the core 23 a, 23 a of the male mold 23 are sandwiched. The continuous fiber prepreg 16 'is laminated in a thin film shape along the front surfaces of the continuous fiber prepreg 15' and the second continuous fiber prepregs 17 ', 17' and flows into the grooves 23b of the cores 23a, 23a. The vertical ribs 14j and the end walls 14k are formed at the same time. And the bumper beam 11 is completed by cut | disconnecting the excess part which protruded on the outer periphery of the bumper beam 11 taken out from the metal mold | die 21. FIG.

図4(A)には、上述のようにして成形されバンパービーム11の断面の板厚が示される。バンパービーム11の底壁14aは、連続繊維プリプレグ15′により構成される連続繊維強化樹脂シート15と、第2の連続繊維プリプレグ17′により構成される第2の連続繊維強化樹脂シート17との2層構造になるため、底壁14aの板厚T1はバンパービーム11の車幅方向全域に亙って上壁14bおよび下壁14cの板厚T2よりも大きくなる。   FIG. 4A shows the plate thickness of the cross section of the bumper beam 11 formed as described above. The bottom wall 14a of the bumper beam 11 is composed of a continuous fiber reinforced resin sheet 15 constituted by a continuous fiber prepreg 15 'and a second continuous fiber reinforced resin sheet 17 constituted by a second continuous fiber prepreg 17'. Due to the layer structure, the plate thickness T1 of the bottom wall 14a is greater than the plate thickness T2 of the upper wall 14b and the lower wall 14c over the entire vehicle width direction of the bumper beam 11.

ただし、底壁14aの板厚T2はバンパービーム11の車幅方向に変化する。即ち、左右の荷重入力部B2,B2の、前後方向外側に最も突出する先端間の板厚T1は一定の最大値であり、そこから車幅方向外側に向かって次第に減少することでバンパービームエクステンション接続部B1の変形中心において最小値となり、そこから車幅方向外側に向かって次第に増加する。 However, the thickness T2 of the bottom wall 14a changes in the vehicle width direction of the bumper beam 11. That is, the thickness T1 between the left and right ends of the left and right load input portions B2 and B2 that protrudes most outward in the front-rear direction is a certain maximum value, and gradually decreases toward the outer side in the vehicle width direction. It becomes the minimum value at the deformation center of the connecting portion B1, and gradually increases from there toward the outside in the vehicle width direction.

図1、図2、図5および図6に示すように、バンパービームエクステンション12は、上下対称な形状を有する上部部材33Uおよび下部部材33Lを、それらの車幅方向外端に形成した側部フランジ33a,33aおよび車幅方向内端に形成した側部フランジ33b,33bで重ね合わせてリベット34…で一体に結合し、前後方向に貫通するボックス状の閉断面に構成される。   As shown in FIGS. 1, 2, 5, and 6, the bumper beam extension 12 includes an upper member 33 </ b> U and a lower member 33 </ b> L having a vertically symmetrical shape, and side flanges formed at their outer ends in the vehicle width direction. 33a, 33a and side flanges 33b, 33b formed at the inner end in the vehicle width direction are overlapped and joined together by rivets 34, and formed into a box-shaped closed cross section penetrating in the front-rear direction.

また上部部材33Uおよび下部部材33Lの前端から前部フランジ33c,33cがそれぞれ前上方および前下方に延びており、上部部材33Uの前部フランジ33cはバンパービームエクステンション12の上壁14bにリベット35…で結合され、下部部材33Lの前部フランジ33cはバンパービームエクステンション12の下壁14cにリベット35…で結合される。これによりバンパービーム11のバンパービームエクステンション接続部B1は、バンパービームエクステンション12の前部フランジ33c,33cにより上下から挟まれるように固定される。   Further, front flanges 33c, 33c extend from the front ends of the upper member 33U and the lower member 33L to the front upper side and the front lower side, respectively, and the front flange 33c of the upper member 33U has a rivet 35 on the upper wall 14b of the bumper beam extension 12. The front flange 33c of the lower member 33L is connected to the lower wall 14c of the bumper beam extension 12 by rivets 35. As a result, the bumper beam extension connecting portion B1 of the bumper beam 11 is fixed so as to be sandwiched from above and below by the front flanges 33c and 33c of the bumper beam extension 12.

バンパービームエクステンション12の上部部材33Uおよび下部部材33Lは、車幅方向外側の側部フランジ33a,33aの前端および前部フランジ33c,33cの車幅方向外端に連なる前壁33d,33dを備えており、これらの側部フランジ33a,33a、前部フランジ33c,33cおよび前壁33d,33dによってバンパービーム11のバンパービームエクステンション接続部B1の車幅方向外端が覆われる。   The upper member 33U and the lower member 33L of the bumper beam extension 12 include front walls 33d and 33d that are continuous with the front ends of the side flanges 33a and 33a on the outer side in the vehicle width direction and the outer ends in the vehicle width direction of the front flanges 33c and 33c. The lateral flanges 33a and 33a, the front flanges 33c and 33c, and the front walls 33d and 33d cover the outer end in the vehicle width direction of the bumper beam extension connection portion B1 of the bumper beam 11.

次に、上記構成を備えた本発明の第1の実施の形態の作用を説明する。   Next, the operation of the first embodiment of the present invention having the above configuration will be described.

自車のバンパービームが他車のバンパービームに前面衝突したような場合、図2に示すように、本実施の形態のバンパービーム11は前方に向けて凹状に湾曲する中央湾曲部Aを備えるため、中央湾曲部Aの車幅方向両側の一対の荷重入力部B2,B2の先端が他車のバンパービームに衝突し、一対の荷重入力部B2,B2の先端の2点に衝突荷重Fが集中的に入力する。その結果、バンパービーム11に作用する曲げモーメントの最大値が低減するだけでなく、中央湾曲部Aを含む一対の荷重入力部B2,B2の先端(荷重Fの入力点)に挟まれた領域に引張荷重が作用し、バンパービームエクステンション接続部B1,B1に圧縮荷重が作用し、バンパービームエクステンション接続部B1,B1と荷重入力部B2,B2の先端とに挟まれた狭い領域だけが捩じり(剪断)変形することになり、捩じり変形によるバンパービーム11の口開きが抑制されて破壊強度が高められる。   When the bumper beam of the host vehicle collides with the bumper beam of the other vehicle in front, as shown in FIG. 2, the bumper beam 11 of the present embodiment has a central curved portion A that curves concavely toward the front. The tip ends of the pair of load input portions B2 and B2 on both sides in the vehicle width direction of the central curved portion A collide with the bumper beam of the other vehicle, and the collision load F is concentrated at two points on the tip ends of the pair of load input portions B2 and B2. Type in. As a result, not only the maximum value of the bending moment acting on the bumper beam 11 is reduced, but also in a region sandwiched between the ends (input points of the load F) of the pair of load input portions B2 and B2 including the central curved portion A. A tensile load is applied, a compressive load is applied to the bumper beam extension connection parts B1 and B1, and only a narrow region sandwiched between the bumper beam extension connection parts B1 and B1 and the tip ends of the load input parts B2 and B2 is twisted. (Shear) deformation is caused, and the opening of the bumper beam 11 due to torsional deformation is suppressed, and the breaking strength is increased.

またバンパービーム11に前方からの衝突荷重が入力すると、左右の曲げ中心間のバンパービーム11が後方に湾曲するように変形するため(図2の鎖線参照)、バンパービーム11の後面側に引張荷重が作用し、バンパービーム11の前面側に圧縮荷重が作用する(図3参照)。   Further, when a collision load from the front is input to the bumper beam 11, the bumper beam 11 between the left and right bending centers is deformed so as to bend backward (see the chain line in FIG. 2), so that a tensile load is applied to the rear surface side of the bumper beam 11. Acts, and a compressive load acts on the front side of the bumper beam 11 (see FIG. 3).

本実施の形態によれば、引張荷重が作用するバンパービーム11の後面側が引張荷重に強い連続繊維強化樹脂シート15で構成されており、その連続繊維強化樹脂シート15の相互に直交する方向に配向された連続繊維のうち、特に車幅方向に配向された連続繊維が引張荷重に抵抗することで、バンパービーム11の軽量化を図りながら曲げ変形に対する強度を高めて衝突エネルギーの吸収性能を向上させることができる。   According to the present embodiment, the rear surface side of the bumper beam 11 on which the tensile load acts is constituted by the continuous fiber reinforced resin sheet 15 strong against the tensile load, and the continuous fiber reinforced resin sheets 15 are oriented in directions orthogonal to each other. Among the formed continuous fibers, the continuous fibers particularly oriented in the vehicle width direction resist the tensile load, thereby increasing the strength against bending deformation while reducing the weight of the bumper beam 11 and improving the collision energy absorption performance. be able to.

また本実施の形態によれば、圧縮荷重が作用するバンパービーム11の前面側が圧縮荷重に強い不連続繊維強化樹脂シート16で構成されており、ランダムに配向されて絡み合った不連続繊維が圧縮荷重に抵抗することで、バンパービーム11の軽量化を図りながら曲げ変形に対する強度を高めて衝突エネルギーの吸収性能をより一層向上させることができる。   Further, according to the present embodiment, the front surface side of the bumper beam 11 on which the compressive load acts is composed of the discontinuous fiber reinforced resin sheet 16 that is strong against the compressive load, and the discontinuous fibers that are randomly oriented and intertwined are compressed. It is possible to further improve the collision energy absorption performance by increasing the strength against bending deformation while reducing the weight of the bumper beam 11.

図2に示すように、バンパービーム11の左右の荷重入力部B2,B2の先端に衝突荷重Fが入力したとき、左右の荷重入力部B2,B2の先端間に作用する曲げモーメントは一定の最大値となり、そこから車幅方向外側に向かって次第に減少することでバンパービームエクステンション接続部B1の変形中心において最小値となり、そこから車幅方向外側に向かって次第に増加する。つまり、バンパービーム11の底壁14aの板厚T1(図4(A)参照)は、そこに作用する曲げモーメントの大きさに応じて設定され、曲げモーメントが大きい部分では板厚T1が大きくなり、曲げモーメントが小さい部分では板厚T1が小さくなる。これにより、バンパービーム11の車幅方向の強度分布を最適化して重量を最小限に抑えながら、必要な曲げ強度を確保することができる。   As shown in FIG. 2, when a collision load F is input to the ends of the left and right load input portions B2 and B2 of the bumper beam 11, the bending moment acting between the ends of the left and right load input portions B2 and B2 is a constant maximum. It becomes a value, and gradually decreases toward the outside in the vehicle width direction, thereby becoming a minimum value at the deformation center of the bumper beam extension connection portion B1, and gradually increases from there toward the outside in the vehicle width direction. That is, the plate thickness T1 (see FIG. 4A) of the bottom wall 14a of the bumper beam 11 is set in accordance with the magnitude of the bending moment acting on the bottom wall 14a. In the portion where the bending moment is small, the plate thickness T1 is small. As a result, the required bending strength can be ensured while optimizing the strength distribution of the bumper beam 11 in the vehicle width direction and minimizing the weight.

特に、底壁14aはバンパービーム11の後端に位置するため、バンパービーム11の前後方向の曲げ変形に関する断面係数の増加に大きく寄与し、底壁14aの板厚T1を増加させることで、重量の増加を最小限に抑えて断面係数を効果的に増加させることができる。   In particular, since the bottom wall 14a is located at the rear end of the bumper beam 11, the bottom wall 14a greatly contributes to an increase in the section modulus related to bending deformation in the front-rear direction of the bumper beam 11, and increases the thickness T1 of the bottom wall 14a. It is possible to effectively increase the section modulus while minimizing the increase of.

更に、底壁14aの連続繊維強化樹脂シート15に第2の連続繊維強化樹脂シート17を積層することで、底壁14aの板厚T1を上壁14bおよび下壁14cの板厚T2よりも大きくしたので、底壁14aの連続繊維の量を増加させて引張荷重に対する強度を高めることができる。   Furthermore, by laminating the second continuous fiber reinforced resin sheet 17 on the continuous fiber reinforced resin sheet 15 on the bottom wall 14a, the plate thickness T1 of the bottom wall 14a is larger than the plate thickness T2 of the upper wall 14b and the lower wall 14c. Therefore, the strength against tensile load can be increased by increasing the amount of continuous fibers of the bottom wall 14a.

またバンパービーム11は車幅方向中央部にカバー部材31を備え、カバー部材31は最上位の上壁14bおよび最下位の下壁14c間を上下方向に接続するので、前後方向の衝突荷重が入力したときにバンパービーム11が口開き変形するのを防止して断面形状を維持し、曲げ応力や剪断応力に対する強度を高めることができる。   The bumper beam 11 includes a cover member 31 at the center in the vehicle width direction, and the cover member 31 connects the uppermost upper wall 14b and the lowermost lower wall 14c in the vertical direction, so that a collision load in the front-rear direction is input. In this case, the bumper beam 11 can be prevented from being deformed by opening to maintain the cross-sectional shape, and the strength against bending stress and shear stress can be increased.

しかもバンパービーム11は不連続繊維強化樹脂シート16を圧縮成形して構成された縦リブ14j…および端壁14k…を備えるので、衝突荷重が入力したときにバンパービーム11が口開き変形するのを防止して断面形状を維持し、曲げ応力や剪断応力に対する強度を高めることができる。   Moreover, since the bumper beam 11 includes the longitudinal ribs 14j and end walls 14k formed by compression molding the discontinuous fiber reinforced resin sheet 16, the bumper beam 11 is deformed by opening when a collision load is input. The cross-sectional shape can be prevented and the strength against bending stress and shear stress can be increased.

またバンパービームエクステンション接続部B1の車幅方向外端を、バンパービームエクステンション12の上部部材33Uおよび下部部材33Lの側部フランジ33a,33a、前部フランジ33c,33cおよび前壁33d,33dによって覆ったので、前後方向の衝突荷重が入力したときにバンパービーム11の車幅方向外端部が口開き変形するのを防止し、衝突荷重をバンパービーム11からバンパービームエクステンション12に確実に伝達して効率的に吸収することができる。   Further, the outer end in the vehicle width direction of the bumper beam extension connecting portion B1 is covered by the side flanges 33a and 33a, the front flanges 33c and 33c, and the front walls 33d and 33d of the upper member 33U and the lower member 33L of the bumper beam extension 12. Therefore, when the collision load in the front-rear direction is input, the outer end portion of the bumper beam 11 in the vehicle width direction is prevented from opening and deformed, and the collision load is reliably transmitted from the bumper beam 11 to the bumper beam extension 12. Can be absorbed.

第2の実施の形態Second embodiment

次に、図8に基づいて本発明の第2の実施の形態を説明する。第1の実施の形態に対応する部材は同じ符号を用いて表示する。   Next, a second embodiment of the present invention will be described with reference to FIG. Members corresponding to those in the first embodiment are denoted by the same reference numerals.

第1の実施の形態では、バンパービーム11の底壁14aの板厚T1を、上壁14bおよび下壁14cの板厚T2よりも大きくする手段として、底壁14aにおいて連続繊維強化樹脂シート15に第2の連続繊維強化樹脂シート17を積層しているが、第2の実施の形態では、第2の連続繊維強化樹脂シート17を廃止し、その代わりに底壁14aにおける不連続繊維強化樹脂シート16の板厚を増加させている。バンパービーム11の加圧成形時に不連続繊維強化樹脂シート16は金型21内で任意の形状に変形可能であるため、その板厚を変化させることは容易である。   In the first embodiment, as a means for making the plate thickness T1 of the bottom wall 14a of the bumper beam 11 larger than the plate thickness T2 of the upper wall 14b and the lower wall 14c, the continuous fiber reinforced resin sheet 15 is formed on the bottom wall 14a. Although the second continuous fiber reinforced resin sheet 17 is laminated, in the second embodiment, the second continuous fiber reinforced resin sheet 17 is abolished, and instead the discontinuous fiber reinforced resin sheet on the bottom wall 14a. The plate thickness of 16 is increased. Since the discontinuous fiber reinforced resin sheet 16 can be deformed into an arbitrary shape in the mold 21 during the pressure molding of the bumper beam 11, it is easy to change the plate thickness.

本実施の形態によれば、底壁14aの不連続繊維強化樹脂シート16を上壁14bおよび下壁14cの不連続繊維強化樹脂シート16よりも厚くすることで、底壁14aの板厚T1を上壁14bおよび下壁14cの板厚T2よりも大きくしたので、底壁14aにおける不連続繊維の量を増加させて圧縮荷重に対する強度を高めることができる。   According to the present embodiment, by making the discontinuous fiber reinforced resin sheet 16 on the bottom wall 14a thicker than the discontinuous fiber reinforced resin sheet 16 on the upper wall 14b and the lower wall 14c, the plate thickness T1 of the bottom wall 14a is set. Since it is larger than the plate thickness T2 of the upper wall 14b and the lower wall 14c, the amount of discontinuous fibers in the bottom wall 14a can be increased to increase the strength against compressive load.

第3の実施の形態Third embodiment

次に、図9〜図17に基づいて本発明の第3の実施の形態を説明する。前述の実施の形態に対応する部材は同じ符号を用いて表示し、詳細な説明は省略し、同様に得られる作用についても記載を省略する。   Next, a third embodiment of the present invention will be described with reference to FIGS. Members corresponding to the above-described embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and description of actions obtained similarly is also omitted.

バンパービーム11は、前方に向けて開放するU字状断面の上ビーム部14Uおよび下ビーム部14Lを上下に結合したW字状断面の部材であり、上ビーム部14Uおよび下ビーム部14Lは、後端に位置する底壁14aと、底壁14aの上端から前方に延びる上壁14bと、底壁14aの下端から前方に延びる下壁14cと、上ビーム部14Uの上壁14bの前端から上方に延びる上部フランジ14dと、下ビーム部14Lの下壁14cの前端から下方に延びる下部フランジ14eと、上ビーム部14Uの下壁14cおよび下ビーム部14Lの上壁14bを上下方向に接続する中間フランジ14fと、上部フランジ14dの上端を後方に折り返した上部折り返し部14gと、下部フランジ14eの下端を後方に折り返した下部折り返し部14hとを備える。   The bumper beam 11 is a member having a W-shaped cross section in which an upper beam section 14U and a lower beam section 14L, which are U-shaped cross sections that are open toward the front, are vertically coupled. The upper beam section 14U and the lower beam section 14L are A bottom wall 14a located at the rear end, an upper wall 14b extending forward from the upper end of the bottom wall 14a, a lower wall 14c extending forward from the lower end of the bottom wall 14a, and upward from the front end of the upper wall 14b of the upper beam portion 14U An upper flange 14d extending downward, a lower flange 14e extending downward from the front end of the lower wall 14c of the lower beam portion 14L, and an intermediate connecting the lower wall 14c of the upper beam portion 14U and the upper wall 14b of the lower beam portion 14L in the vertical direction. A flange 14f, an upper folded portion 14g obtained by folding the upper end of the upper flange 14d rearward, and a lower folded portion 1 obtained by folding the lower end of the lower flange 14e rearward. And a h.

またバンパービームエクステンション接続部B1の上ビーム部14Uおよび下ビーム部14Lの車幅方向中間部は、それぞれ上壁14b、底壁14aおよび下壁14cを接続するように上下方向かつ前後方向に延びる2枚の縦リブ14j,14jを備えるとともに、上ビーム部14Uおよび下ビーム部14Lの車幅方向外端部は、それぞれ上壁14b、底壁14aおよび下壁14cを接続するように上下方向かつ前後方向に延びる1枚の端壁14kを備える。尚、バンパービーム11の車幅方向内側の縦リブ14j…から端壁14k…までの間には、上部フランジ14d,14d、下部フランジ14e,14e、上部折り返し部14gおよび下部折り返し部14hは形成されていない(図9参照)。   Further, the vehicle width direction intermediate portions of the upper beam portion 14U and the lower beam portion 14L of the bumper beam extension connection portion B1 extend in the vertical direction and the front-rear direction so as to connect the upper wall 14b, the bottom wall 14a, and the lower wall 14c, respectively. In addition to the vertical ribs 14j and 14j, the outer end portions in the vehicle width direction of the upper beam portion 14U and the lower beam portion 14L are connected to the upper wall 14b, the bottom wall 14a, and the lower wall 14c in the vertical direction and in the front-rear direction. One end wall 14k extending in the direction is provided. The upper flanges 14d and 14d, the lower flanges 14e and 14e, the upper folded portion 14g and the lower folded portion 14h are formed between the longitudinal ribs 14j on the inner side in the vehicle width direction of the bumper beam 11 and the end walls 14k. (See FIG. 9).

バンパービーム11の車幅方向中央部には金属製の引張部材131が装着される。引張部材131は、矩形状の本体部31a′と、本体部31a′の上下端を後方に折り曲げた係止部31b′,31c′を備えており、上端の係止部31b′および下端の係止部31c′が、バンパービーム11の上部フランジ14dの上部折り返し部14gおよび下部フランジ14eの下部折り返し部14hにそれぞれクリップ32′,32′で固定される。これにより、引張部材131の上端の係止部31b′がバンパービーム11の上部折り返し部14gに上方から係合し、引張部材131の下端の係止部31c′がバンパービーム11の下部折り返し部14hに下方から係合する。   A metallic tension member 131 is attached to the center of the bumper beam 11 in the vehicle width direction. The tension member 131 includes a rectangular main body portion 31a ′ and locking portions 31b ′ and 31c ′ in which the upper and lower ends of the main body portion 31a ′ are bent rearward. The stop portion 31c ′ is fixed to the upper folded portion 14g of the upper flange 14d of the bumper beam 11 and the lower folded portion 14h of the lower flange 14e by clips 32 ′ and 32 ′, respectively. As a result, the upper locking portion 31 b ′ of the tension member 131 engages with the upper folding portion 14 g of the bumper beam 11 from above, and the lower locking portion 31 c ′ of the tension member 131 is the lower folding portion 14 h of the bumper beam 11. Is engaged from below.

本実施の形態では、連続繊維プリプレグ15′の補強材は、ガラス連続繊維を相互に直交する方向に配向した織布であり、不連続繊維プリプレグ16′の補強材は、ランダム配向した繊維長が30mm程度の長繊維からなるガラス不連続繊維の不織布である(図16参照)。   In the present embodiment, the reinforcing material of the continuous fiber prepreg 15 ′ is a woven fabric in which continuous glass fibers are oriented in directions orthogonal to each other, and the reinforcing material of the discontinuous fiber prepreg 16 ′ has a randomly oriented fiber length. It is a nonwoven fabric of glass discontinuous fibers made of long fibers of about 30 mm (see FIG. 16).

従って、雌型22および雄型23を型締めすると、連続繊維プリプレグ15′が雌型22のキャビティ22a,22aと雄型23のコア23a,23aとによってプレスされ、W字状断面を有するバンパービーム11の後面が成形される。このとき、不連続繊維プリプレグ16′は容易に変形可能であるため、連続繊維プリプレグ15′と雄型23のコア23a,23aとによって挟まれた不連続繊維プリプレグ16′は、連続繊維プリプレグ15′の前面に沿って薄い膜状に積層されるとともに、コア23a,23aの溝23b…内に流入して縦リブ14j…および端壁14k…を成形し、かつ上部折り返し部14gおよび下部折り返し部14hを同時に成形する。そして金型21から取り出したバンパービーム11の外周にはみ出した余剰部分を切断することで、バンパービーム11を完成する。このように、成形性の高い不連続繊維強化樹脂シート16により、複雑な断面形状のバンパービーム11を容易に成形することができる。   Therefore, when the female mold 22 and the male mold 23 are clamped, the continuous fiber prepreg 15 ′ is pressed by the cavities 22 a and 22 a of the female mold 22 and the cores 23 a and 23 a of the male mold 23, and a bumper beam having a W-shaped cross section. The rear surface of 11 is molded. At this time, since the discontinuous fiber prepreg 16 ′ can be easily deformed, the discontinuous fiber prepreg 16 ′ sandwiched between the continuous fiber prepreg 15 ′ and the cores 23 a and 23 a of the male mold 23 is the continuous fiber prepreg 15 ′. Are laminated in a thin film shape along the front surface of the core 23a and flow into the grooves 23b of the cores 23a, 23a to form the vertical ribs 14j and the end walls 14k, and the upper folded portion 14g and the lower folded portion 14h. Are molded at the same time. And the bumper beam 11 is completed by cut | disconnecting the excess part which protruded on the outer periphery of the bumper beam 11 taken out from the metal mold | die 21. FIG. Thus, the bumper beam 11 having a complicated cross-sectional shape can be easily formed by the discontinuous fiber reinforced resin sheet 16 having high formability.

圧縮された不連続繊維プリプレグ16′がコア23a,23aの溝23b…内に流入して縦リブ14j…を成形する際に、不連続繊維プリプレグ16′に含まれる不連続繊維の長手方向が流れの方向に沿って整列することで、縦リブ14j…の強度が効果的に高められる(図14の鎖線枠内参照)。   When the compressed discontinuous fiber prepreg 16 'flows into the grooves 23b of the cores 23a and 23a to form the longitudinal ribs 14j, the longitudinal direction of the discontinuous fibers contained in the discontinuous fiber prepreg 16' flows. , The strength of the vertical ribs 14j is effectively increased (see the inside of the chain line frame in FIG. 14).

図9〜図11および図13〜図15に示すように、バンパービームエクステンション12は上下対称な形状を有する上部部材33Uおよび下部部材33Lを備え、上部部材33Uおよび下部部材33Lのコ字状断面を有する本体部33a′,33a′を、それらの車幅方向外端に形成した側部フランジ33b′,33b′および車幅方向内端に形成した側部フランジ33c′,33c′で重ね合わせてリベット34…で一体に結合することで、前後方向に貫通するボックス状の閉断面に構成される。   As shown in FIGS. 9 to 11 and 13 to 15, the bumper beam extension 12 includes an upper member 33U and a lower member 33L having vertically symmetrical shapes, and the U-shaped cross sections of the upper member 33U and the lower member 33L. The main body portions 33a 'and 33a' are overlapped with side flanges 33b 'and 33b' formed at the outer end in the vehicle width direction and side flanges 33c 'and 33c' formed at the inner end in the vehicle width direction. 34 are integrated into a box-shaped closed cross section penetrating in the front-rear direction.

また車幅方向内側の側部フランジ33c′,33c′の前端から車幅方向内側に向けて三角形状の延長部33d′,33d′が張り出しており、本体部33a′,33a′の前端から延長部33d′,33d′の前端に跨がるようにバンパービーム取付部33e,33eが形成される。上部部材33Uのバンパービーム取付部33eは、本体部33a′から上方に立ち上がった後に前方に延び、前方に延びる部分がバンパービーム11の上ビーム部14Uの上壁14bの上面に重ね合わされ、4本のリベット35…で固定される。同様に下部部材33Lのバンパービーム取付部33eは、本体部33a′から下方に立ち下がった後に前方に延び、前方に延びる部分がバンパービーム11の下ビーム部14Lの下壁14cの下面に重ね合わされ、4本のリベット35…で固定される。そして本体部33a′の前側に連なるバンパービーム取付部33e,33eの車幅方向外端に、バンパービーム11の車幅方向外端を前方から覆う係止壁33g,33gが形成される。   Triangular extensions 33d 'and 33d' project from the front ends of the side flanges 33c 'and 33c' on the inner side in the vehicle width direction toward the inner side in the vehicle width direction and extend from the front ends of the main body portions 33a 'and 33a'. Bumper beam mounting portions 33e and 33e are formed so as to straddle the front ends of the portions 33d ′ and 33d ′. The bumper beam mounting portion 33e of the upper member 33U rises upward from the main body portion 33a ′ and then extends forward, and the portion extending forward is superimposed on the upper surface of the upper wall portion 14b of the upper beam portion 14U of the bumper beam 11. Are fixed with rivets 35. Similarly, the bumper beam attaching portion 33e of the lower member 33L extends forward after falling downward from the main body portion 33a ', and the portion extending forward is overlapped with the lower surface of the lower wall 14c of the lower beam portion 14L of the bumper beam 11. It is fixed with four rivets 35. Locking walls 33g and 33g that cover the outer end in the vehicle width direction of the bumper beam 11 from the front are formed at the outer end in the vehicle width direction of the bumper beam mounting portions 33e and 33e that are connected to the front side of the main body 33a '.

次に、上記構成を備えた本発明の第3の実施の形態の作用を説明する。   Next, the operation of the third embodiment of the present invention having the above configuration will be described.

自車のバンパービームが他車のバンパービームに前面衝突したような場合、図10および図17(A)に示すように、本実施の形態のバンパービーム11は、前述の実施の形態と同様に、捩じり変形による口開きが抑制されて破壊強度が高められる。   When the bumper beam of the own vehicle collides with the bumper beam of another vehicle in the front, as shown in FIGS. 10 and 17A, the bumper beam 11 of the present embodiment is the same as the above-described embodiment. Opening due to torsional deformation is suppressed, and the breaking strength is increased.

このとき、バンパービームエクステンション12はバンパービーム11の変形中心よりも車幅方向内側に延長されてバンパービームエクステンション接続部B1に接続される延長部33d′,33d′を備えるので、前面衝突の衝突荷重が入力したときにバンパービーム11の変形中心の位置を車幅方向内側に移動させ、バンパービーム11に作用する曲げモーメントの最大値を低下させることで、バンパービーム11を軽量化しながら局部的な破壊を防止することができる。しかも前後方向に見たときにバンパービームエクステンション12の延長部33d′,33d′はバンパービーム11の上部折り返し部14gおよび下部折り返し部14hにオーバーラップするので、衝突荷重をバンパービーム11からバンパービームエクステンション12の延長部33d′,33d′に効率的に伝達し、延長部33d′,33d′を座屈変形させて衝突エネルギーを吸収することができる。   At this time, the bumper beam extension 12 includes extension portions 33d ′ and 33d ′ that are extended inward in the vehicle width direction from the deformation center of the bumper beam 11 and connected to the bumper beam extension connection portion B1, so that the collision load of the frontal collision Is input, the position of the deformation center of the bumper beam 11 is moved inward in the vehicle width direction, and the maximum value of the bending moment acting on the bumper beam 11 is reduced. Can be prevented. Moreover, the extension portions 33d 'and 33d' of the bumper beam extension 12 overlap the upper folded portion 14g and the lower folded portion 14h of the bumper beam 11 when viewed in the front-rear direction. The extension portions 33d 'and 33d' can be efficiently transmitted to the 12 extension portions 33d 'and 33d' to buckle and absorb the collision energy.

本実施の形態によれば、バンパービーム11は車幅方向中央部に引張部材131を備え、引張部材131は上部折り返し部14gおよび下部折り返し部14h間を上下方向に接続するので、前後方向の衝突荷重が入力したときにバンパービーム11が口開き変形するのを一層確実に防止して断面形状を維持し、曲げ応力や剪断応力に対する強度を高めることができる。   According to the present embodiment, the bumper beam 11 includes the tension member 131 at the center in the vehicle width direction, and the tension member 131 connects the upper folded portion 14g and the lower folded portion 14h in the vertical direction. It is possible to more reliably prevent the bumper beam 11 from being deformed by opening when a load is input, maintain the cross-sectional shape, and increase the strength against bending stress and shear stress.

図17(A)に示すように、バンパービーム11の左右の荷重入力部B2,B2の先端に衝突荷重Fが入力したとき、左右の荷重入力部B2,B2の先端間に作用する曲げモーメントは一定の最大値となり、そこから車幅方向外側に向かって次第に減少することでバンパービームエクステンション接続部B1の変形中心において最小値となる。   As shown in FIG. 17A, when a collision load F is input to the ends of the left and right load input portions B2 and B2 of the bumper beam 11, the bending moment acting between the ends of the left and right load input portions B2 and B2 is It becomes a certain maximum value, and then gradually decreases toward the outside in the vehicle width direction, so that it becomes the minimum value at the deformation center of the bumper beam extension connection portion B1.

バンパービームエクステンション12のバンパービーム取付部33e,33eをバンパービーム11のバンパービームエクステンション接続部B1に固定する上下各4本のリベット35…のうち、上下各3本のリベット35…が本体部33a′,33a′の前方に位置している。これら3本のリベット35…のうち、最も車幅方向内側に位置するリベット35(車幅方向内側の締結点)の近傍が前記変形中心となり、最も車幅方向外側に位置するリベット35(車幅方向外側の締結点)の近傍に前記係止壁33gが形成される。   Of the four upper and lower rivets 35 for fixing the bumper beam mounting portions 33e and 33e of the bumper beam extension 12 to the bumper beam extension connection portion B1 of the bumper beam 11, the upper and lower three rivets 35 are the main body portion 33a ′. , 33a ′. Of these three rivets 35, the vicinity of the rivet 35 (the fastening point on the inner side in the vehicle width direction) that is located on the innermost side in the vehicle width direction is the deformation center, and the rivet 35 (the vehicle width on the outermost side in the vehicle width direction). The locking wall 33g is formed in the vicinity of the fastening point on the outer side in the direction.

図17(A)に示すように、仮に、バンパービーム11の車幅方向外端部がバンパービームエクステンション12に固定されていないとすると、バンパービーム11の変形中心において曲げモーメントがゼロになり、荷重の入力点において曲げモーメントが最大値となる。   As shown in FIG. 17A, if the outer end in the vehicle width direction of the bumper beam 11 is not fixed to the bumper beam extension 12, the bending moment becomes zero at the deformation center of the bumper beam 11, and the load The bending moment becomes the maximum value at the input point.

しかしながら、実際にはバンパービーム11の車幅方向外端部がバンパービームエクステンション12にリベット35で固定され、かつ係止壁33gでバンパービームエクステンション12の前端に係止されているため、衝突荷重の入力時に変形中心を支点として前方に移動しようとするバンパービーム11の車幅方向外端部が、バンパービームエクステンション12から後向きの荷重fを受けることになる。この荷重fにより、図17(B)に示すように、バンパービーム11に逆向きの曲げモーメント(バンパービーム11を前方に凸に変形させる曲げモーメント)が作用することで、荷重の入力点に作用する曲げモーメントが最大値が低減し、これにより荷重の入力点におけるバンパービーム11の局部的な破壊を防止することができる。   However, in reality, the outer end of the bumper beam 11 in the vehicle width direction is fixed to the bumper beam extension 12 with a rivet 35 and is locked to the front end of the bumper beam extension 12 with a locking wall 33g. The outer end in the vehicle width direction of the bumper beam 11 that tries to move forward with the deformation center as a fulcrum during input receives a backward load f from the bumper beam extension 12. As shown in FIG. 17B, this load f causes a reverse bending moment (a bending moment that deforms the bumper beam 11 to protrude forward) on the bumper beam 11, thereby acting on the input point of the load. The maximum value of the bending moment to be reduced is reduced, whereby local destruction of the bumper beam 11 at the load input point can be prevented.

このとき、バンパービーム11の車幅方向外端部をリベット35だけでバンパービームエクステンション12に固定すると、その部分に荷重が集中して破断する可能性があるが、前記リベット35を補助するように係止壁33gでバンパービームエクステンション12およびバンパービーム11を固定することで、バンパービーム11の車幅方向外端部の破断を防止することができる。   At this time, if the outer end in the vehicle width direction of the bumper beam 11 is fixed to the bumper beam extension 12 with only the rivet 35, there is a possibility that the load concentrates on the portion and breaks, but the rivet 35 is assisted. By fixing the bumper beam extension 12 and the bumper beam 11 with the locking wall 33g, the outer end of the bumper beam 11 in the vehicle width direction can be prevented from breaking.

ところで、バンパービームエクステンション12は、バンパービーム11から後向きの圧縮荷重を受けて圧壊することで衝突エネルギーを吸収するが、衝突荷重の入力時に変形中心を支点として前方に移動しようとするバンパービーム11の車幅方向外端部に引っ張られ、バンパービームエクステンション12の車幅方向外端部に前向きの荷重f′が作用する(図17(B)参照)。この荷重f′はバンパービームエクステンション12の圧壊を抑制する方向に作用するため、その大きさが過大になるとバンパービームエクステンション12の安定した圧壊が阻害されてエネルギー吸収性能が低下する可能性がある。   By the way, the bumper beam extension 12 absorbs collision energy by receiving and compressing a backward compressive load from the bumper beam 11, but when the collision load is input, the bumper beam extension 12 moves forward with the deformation center as a fulcrum. Pulled to the outer end in the vehicle width direction, a forward load f ′ acts on the outer end in the vehicle width direction of the bumper beam extension 12 (see FIG. 17B). Since the load f ′ acts in a direction that suppresses the collapse of the bumper beam extension 12, when the load f ′ is excessive, stable collapse of the bumper beam extension 12 may be hindered and energy absorption performance may be reduced.

しかしながら、本実施の形態によれば、バンパービーム11の車幅方向内側の締結点であるリベット35よりも車幅方向外側には上部折り返し部14gおよび下部折り返し部14hが形成されていないため、変形中心の車幅方向外側でバンパービーム11の強度を敢えて低下させ、バンパービームエクステンション12の車幅方向外端部で前向きの荷重f′が過大になるのを防止することで、バンパービームエクステンション12の安定した圧壊を可能にすることができる。   However, according to the present embodiment, the upper folded portion 14g and the lower folded portion 14h are not formed on the outer side in the vehicle width direction than the rivet 35 that is the fastening point on the inner side in the vehicle width direction of the bumper beam 11. The strength of the bumper beam 11 is deliberately reduced at the outer side in the center of the vehicle width direction, and the forward load f ′ is prevented from becoming excessive at the outer end portion of the bumper beam extension 12 in the vehicle width direction. Stable crushing can be enabled.

またバンパービーム11のバンパービームエクステンション接続部B1は前後方向および上下方向に延びる縦リブ14j,14jを備え、上部折り返し部14gおよび下部折り返し部14hの車幅方向外端は縦リブ14j,14jの位置を超えて車幅方向外側に延びるので、衝突荷重がバンパービーム11に入力したときに、バンパービーム11の口開き変形を上部折り返し部14gおよび下部折り返し部14hだけでなく縦リブ14j,14jにより一層確実に防止し、衝突荷重をバンパービーム11からバンパービームエクステンション12に一層確実に伝達して衝突エネルギーの吸収効果を高めることができる。   The bumper beam extension connecting portion B1 of the bumper beam 11 includes longitudinal ribs 14j and 14j extending in the front-rear direction and the up-down direction, and the outer ends in the vehicle width direction of the upper folded portion 14g and the lower folded portion 14h are the positions of the vertical ribs 14j and 14j. When the collision load is input to the bumper beam 11, the opening deformation of the bumper beam 11 is further enhanced not only by the upper folded portion 14g and the lower folded portion 14h but also by the vertical ribs 14j and 14j. Thus, the collision load can be more reliably transmitted from the bumper beam 11 to the bumper beam extension 12 to enhance the absorption effect of the collision energy.

第4の実施の形態Fourth embodiment

次に、図18に基づいて本発明の第4の実施の形態を説明する。前述の実施の形態に対応する部材は同じ符号を用いて表示する。   Next, a fourth embodiment of the present invention will be described with reference to FIG. Members corresponding to the above-described embodiment are indicated using the same reference numerals.

第3の実施の形態の引張部材131は金属製であるが、本実施の形態の引張部材131′は繊維強化樹脂製であり、前側に位置する連続繊維強化樹脂シート17aと後側に位置する不連続繊維強化樹脂シート18とを積層して構成される。そして引張部材131′の不連続繊維強化樹脂シート18よりなる上下の係止部31b′,31c′の内面は、バンパービーム11の不連続繊維強化樹脂シート16よりなる上部フランジ14d、下部フランジ14e、上部折り返し部14gおよび下部折り返し部14hに振動溶着により固定される。   Although the tension member 131 of the third embodiment is made of metal, the tension member 131 'of the present embodiment is made of fiber reinforced resin, and is located on the continuous fiber reinforced resin sheet 17a located on the front side and on the rear side. The discontinuous fiber reinforced resin sheet 18 is laminated. The inner surfaces of the upper and lower engaging portions 31b 'and 31c' made of the discontinuous fiber reinforced resin sheet 18 of the tension member 131 'are formed with an upper flange 14d, a lower flange 14e, It is fixed to the upper folded portion 14g and the lower folded portion 14h by vibration welding.

このように、引張部材131′およびバンパービーム11の不連続繊維強化樹脂シート16,18どうしを振動溶着することで溶着強度が高められるだけでなく、クリップ32′,32′のような特別の固定部材が不要になって部品点数の削減が可能になる。しかも引張部材131′の連続繊維強化樹脂シート17aが少なくとも上下方向に配向された連続繊維を含むことで、充分な引張強度を確保することができる。   In this way, not only the welding strength is increased by vibration welding the discontinuous fiber reinforced resin sheets 16 and 18 of the tension member 131 'and the bumper beam 11, but also special fixing such as clips 32' and 32 '. A member becomes unnecessary and the number of parts can be reduced. In addition, since the continuous fiber reinforced resin sheet 17a of the tensile member 131 'includes continuous fibers oriented at least in the vertical direction, sufficient tensile strength can be ensured.

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、実施の形態ではフロント側のバンパービーム11について説明したが、本発明はリヤ側のバンパービームに対しても適用することができる。フロント側のバンパービームの場合には,前後方向外側は前方に対応し、リヤ側のバンパービームの場合には,前後方向外側は後方に対応する。   For example, in the embodiment, the front bumper beam 11 has been described, but the present invention can also be applied to a rear bumper beam. In the case of a front bumper beam, the outer side in the front-rear direction corresponds to the front, and in the case of the rear bumper beam, the outer side in the front-rear direction corresponds to the rear.

また実施の形態のバンパービーム11は前後方向外側に向けて開放するW字状断面を有するが、本発明のバンパービーム19は前後方向外側に向けて開放するU字状(あるいはコ字状)断面を有するものであっても良い。   Further, the bumper beam 11 of the embodiment has a W-shaped cross section that opens outward in the front-rear direction, but the bumper beam 19 of the present invention has a U-shaped (or U-shaped) cross section that opens outward in the front-rear direction. It may have.

また実施の形態のバンパービームエクステンション12は、フロントサイドフレームの前突で潰れて衝撃吸収する前端部や、リヤサイドフレームの後突で潰れて衝撃吸収する後端部といった、衝撃吸収部材であっても良い。
The bumper beam extension 12 according to the embodiment may be a shock absorbing member such as a front end portion that is crushed by the front side frame and absorbs shock, or a rear end portion that is crushed by the rear side frame and absorbs shock. good.

Claims (5)

W字状断面あるいはU字状断面を有するとともに、不連続繊維を含む不連続繊維強化樹脂シート(16)と、連続繊維を含む連続繊維強化樹脂シート(15)とを積層して構成されたバンパービーム(11)が、車幅方向外側に位置して衝撃吸収部材(12)に接続される左右一対の衝撃吸収部材接続部(B1)と、該衝撃吸収部材接続部(B1)の車幅方向内側に位置して前記バンパービーム(11)のうちで前後方向外側に最も突出する左右一対の荷重入力部(B2)とを備えてなる自動車用バンパーであって、
前記バンパービーム(11)は、垂直に位置する底壁(14a)と、前記底壁(14a)の上下両端から水平方向に延びる側壁(14b,14c)とを備え、前記底壁(14a)の板厚(T1)は前記側壁(14b,14c)の板厚(T2)よりも大きく、
前記左右の荷重入力部(B2)の前後方向外側に最も突出する先端に衝突荷重(F)が入力したとき、それら左右の荷重入力部(B2)の先端間に作用する曲げモーメント一定の最大値となり、そこから車幅方向外側に向かって次第に減少することで前記衝撃吸収部材接続部(B1)の変形中心において前記曲げモーメントが最小値となるのに対応して、前記曲げモーメントが大きい部分では前記板厚(T1)が大きくなり、前記曲げモーメントが小さい部分では前記板厚(T1)が小さくなるように、衝突荷重(F)により前記バンパービーム(11)に作用する曲げモーメントの分布に応じて前記底壁(14a)の板厚(T1)を車幅方向に変化させたことを特徴とする自動車用バンパー。
And has a W-shaped cross section or a U-shaped cross section, the discontinuous fiber-reinforced resin sheet (16) comprising discontinuous fibers, were constructed by laminating a continuous fiber-reinforced resin sheet comprising continuous fibers (15) bumper A pair of left and right shock absorbing member connecting portions (B1) in which the beam (11) is located on the outer side in the vehicle width direction and connected to the shock absorbing member (12) , and the vehicle width direction of the shock absorbing member connecting portion (B1) An automotive bumper comprising a pair of left and right load input portions (B2) that are located inside and protrude most outward in the front-rear direction among the bumper beams (11) ,
The bumper beam (11) includes a bottom wall (14a) positioned vertically and side walls (14b, 14c) extending horizontally from upper and lower ends of the bottom wall (14a). The plate thickness (T1) is larger than the plate thickness (T2) of the side walls (14b, 14c),
When a collision load (F) is input to the tip that protrudes most outward in the front-rear direction of the left and right load input portions (B2), the bending moment acting between the tips of the left and right load input portions (B2) is a constant maximum. is the value from which to correspond to the bending moment ing and the minimum value in the deformed center of the shock absorbing member connecting portion (B1) by gradually decreases toward the outside in the vehicle width direction, is larger the bending moment moiety wherein thickness (T1) is increased in the bending so that the thickness (T1) is reduced in the portion moment is small, the distribution of the bending moment acting on the bumper beam (11) by the collision load (F) Accordingly, a bumper for an automobile, wherein the thickness (T1) of the bottom wall (14a) is changed in the vehicle width direction.
前記底壁(14a)の連続繊維強化樹脂シート(15)に第2の連続繊維強化樹脂シート(17)を積層することで、前記底壁(14a)の板厚(T1)を前記側壁(14b,14c)の板厚(T2)よりも大きくしたことを特徴とする、請求項1に記載の自動車用バンパー。   By laminating the second continuous fiber reinforced resin sheet (17) on the continuous fiber reinforced resin sheet (15) on the bottom wall (14a), the thickness (T1) of the bottom wall (14a) is reduced to the side wall (14b). 14c), the bumper for automobiles according to claim 1, wherein the bumper is larger than the plate thickness (T2). 前記底壁(14a)の不連続繊維強化樹脂シート(16)を前記側壁(14b,14c)の不連続繊維強化樹脂シート(16)よりも厚くすることで、前記底壁(14a)の板厚(T1)を前記側壁(14b,14c)の板厚(T2)よりも大きくしたことを特徴とする、請求項1に記載の自動車用バンパー。   The thickness of the bottom wall (14a) is increased by making the discontinuous fiber reinforced resin sheet (16) on the bottom wall (14a) thicker than the discontinuous fiber reinforced resin sheet (16) on the side walls (14b, 14c). The automobile bumper according to claim 1, wherein (T1) is larger than a plate thickness (T2) of the side walls (14b, 14c). 前記バンパービーム(11)は、車幅方向中央部において前後方向外側に向けて凹状に湾曲する中央湾曲部(A)と、前記中央湾曲部(A)の車幅方向両側において前後方向外側に向けて凸状に湾曲する一対の左右湾曲部(B)とからなり、前記左右湾曲部(B)は、前記衝撃吸収部材接続部(B1)と前記荷重入力部(B2)とを備えることを特徴とする、請求項1に記載の自動車用バンパー。 The bumper beam (11) has a central curved portion (A) that is concavely curved toward the outside in the front-rear direction at the center in the vehicle width direction, and is directed outward in the front-rear direction on both sides in the vehicle width direction of the central curved portion (A). Te becomes since a pair of left and right curved portion curved convexly and (B), the right and left curved portion (B) is obtain prior Symbol Bei impact absorbing member connecting portion and (B1) and front Symbol load input portion (B2) The automobile bumper according to claim 1, wherein: 前記バンパービーム(11)は上部フランジ(14d)を前後方向内側に折り返した上部折り返し部(14g)と下部フランジ(14e)を前後方向内側に折り返した下部折り返し部(14h)とを備え、前記衝撃吸収部材接続部(B1)は少なくとも車幅方向内側の締結点(35)および車幅方向外側の締結点(35)で前記衝撃吸収部材(12)の本体部(33a′)に締結され、前記上部折り返し部(14g)および前記下部折り返し部(14h)の車幅方向外端は前記車幅方向内側の締結点(35)の近傍を終端とすることを特徴とする、請求項に記載の自動車用バンパー。 The bumper beam (11) includes an upper folded portion (14g) in which an upper flange (14d) is folded inward in the front-rear direction and a lower folded portion (14h) in which a lower flange (14e) is folded back inward in the front-rear direction. The absorbing member connecting portion (B1) is fastened to the main body portion (33a ') of the shock absorbing member (12) at least at the fastening point (35) inside the vehicle width direction and the fastening point (35) outside the vehicle width direction, upper folded portion (14 g) and the lower folded portion in the vehicle width direction outer end of (14h) is characterized by a terminating near the vehicle width direction inner side of the fastening point (35), according to claim 4 Automotive bumper.
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