JP2009126266A - Vehicle lower part structure - Google Patents

Vehicle lower part structure Download PDF

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Publication number
JP2009126266A
JP2009126266A JP2007301427A JP2007301427A JP2009126266A JP 2009126266 A JP2009126266 A JP 2009126266A JP 2007301427 A JP2007301427 A JP 2007301427A JP 2007301427 A JP2007301427 A JP 2007301427A JP 2009126266 A JP2009126266 A JP 2009126266A
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vehicle
support member
road surface
bumper
cross
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Akihiro Osanai
昭博 小山内
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle lower part structure that protects vehicular parts from an obstacle on a road surface and reduces an impact reaction force given to a pedestrian or the like when a vehicle collides with the pedestrian or the like. <P>SOLUTION: A radiator support lower cross 14 of the vehicle front side and a suspension member front cross 20 of the vehicle rear aide are arranged in the vehicle front portion 10. A mounting portion 16A of the rear end side of a bumper lower absorber 16 is joined to the front end flange portion 14A of the radiator support lower cross 14. A mounting portion 22A of the rear end side of a bracket 22 for preventing interference with the road surface is joined to the lower surface part 20A of the suspension member front cross 20 in a cantilever supported state. The front end portion 22C of the bracket 22 for preventing interference with the road surface is extended up to below the radiator support lower cross 14 spaced from the radiator support lower cross 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、車両の下部に保護部材を備えた車両下部構造に関する。   The present invention relates to a vehicle lower structure provided with a protective member at the lower part of a vehicle.

下記特許文献1には、アンダバンパの端部が受部材に当接したときにアンダバンパの端部にかかる荷重を乗降用ステップと前輪に分散させ、衝突エネルギーを分散させて減衰し、衝突側及び被衝突側のダメージを低減する構造が開示されている。   In Patent Document 1 below, when the end of the under bumper comes into contact with the receiving member, the load applied to the end of the under bumper is distributed to the getting-on / off step and the front wheel, and the collision energy is distributed and attenuated. A structure for reducing the damage on the collision side is disclosed.

また、下記特許文献2には、補強部材がバンパロアフェースの下端に取付けられると共に、この取付部の車両幅方向近傍とバンパーフェース後方に配設されているクロスメンバとの間に車両前方下部を覆うアンダーカバーが連結された構造が開示されている。
特開2000−318547号公報 特開2004−203158号公報
Further, in Patent Document 2 below, a reinforcing member is attached to the lower end of the bumper lower face, and a lower front portion of the vehicle is provided between the vicinity of the attaching portion in the vehicle width direction and a cross member disposed behind the bumper face. A structure in which a covering under cover is connected is disclosed.
JP 2000-318547 A JP 2004-203158 A

しかしながら、上記特許文献1による場合、路面干渉物が車両下部に接触したときの車両部品の損傷防止については考慮されていない。   However, according to the above-mentioned Patent Document 1, no consideration is given to preventing damage to vehicle parts when a road surface interference object comes into contact with the lower part of the vehicle.

また、上記特許文献2による場合、アンダーカバーが路面干渉物を乗り越す際に、アンダーカバーが撓んで補強部材やクロスメンバを上方に押し上げ、車両部品等を損傷させる可能性がある。   Further, according to Patent Document 2, when the under cover gets over the road surface interference, the under cover may bend and push up the reinforcing member and the cross member upward, thereby damaging the vehicle parts and the like.

本発明は上記事実を考慮し、路面干渉物から車両部品等を保護することができると共に、車両が歩行者等と衝突したときに歩行者等へ与える衝突反力を低減することができる車両下部構造を得ることが目的である。   In consideration of the above fact, the present invention can protect vehicle parts and the like from road surface interferences, and can reduce the collision reaction force applied to pedestrians and the like when the vehicle collides with pedestrians and the like. The purpose is to obtain a structure.

請求項1の発明に係る車両下部構造は、車両前部の前方側下部に設けられた前方側支持部材と、前記前方側支持部材よりも車両後方側に設けられた後方側支持部材と、前記前方側支持部材に接合され、車両幅方向に沿って配置されると共に、車両後方側の端部に嵌合部が形成されたロアバンパと、車両幅方向に沿って配置されると共に車両前後方向の後端部が前記後方側支持部材に片持ち支持状態で接合され、車両前後方向の前端部が前記前方側支持部材と間隔をおいて前記前方側支持部材の下方まで延設され、所定の衝突荷重が作用して前記ロアバンパが後方側に移動したときに前記嵌合部と嵌合する被嵌合部が前記前端部に形成された路面干渉防止用の保護部材と、を有することを特徴とする。   A vehicle lower structure according to the invention of claim 1 is a front-side support member provided at a front lower portion of a vehicle front portion, a rear-side support member provided at a vehicle rear side relative to the front-side support member, A lower bumper joined to the front side support member and arranged along the vehicle width direction and having a fitting portion formed at an end on the vehicle rear side, and arranged along the vehicle width direction and in the vehicle longitudinal direction. The rear end portion is joined to the rear side support member in a cantilevered state, and the front end portion in the vehicle front-rear direction extends to the lower side of the front side support member at a predetermined distance from the front side support member. A fitted portion that is fitted to the fitting portion when a load acts and the lower bumper moves to the rear side includes a protection member for preventing road surface interference formed on the front end portion. To do.

請求項2の発明は、請求項1に記載の車両下部構造において、前記嵌合部が凹部で前記被嵌合部が凸部であり、又は前記嵌合部が凸部で前記被嵌合部が凹部であることを特徴とする。   According to a second aspect of the present invention, in the vehicle lower structure according to the first aspect, the fitting portion is a concave portion and the fitted portion is a convex portion, or the fitting portion is a convex portion and the fitted portion. Is a recess.

請求項3の発明は、請求項1又は請求項2に記載の車両下部構造において、前記後方側支持部材の下面部が前記前方側支持部材の下面部よりも下方に配置され、前記保護部材は、前記後端部が前記後方側支持部材の下面部に接合されると共に、前記前端部が上方に傾斜するように形成されていることを特徴とする。   According to a third aspect of the present invention, in the lower vehicle structure according to the first or second aspect, the lower surface portion of the rear support member is disposed below the lower surface portion of the front support member, and the protection member is The rear end portion is joined to the lower surface portion of the rear side support member, and the front end portion is formed to be inclined upward.

請求項1記載の本発明によれば、車両幅方向に沿ってロアバンパが配置されており、ロアバンパが車両前部の前方側下部に設けられた前方側支持部材に接合されている。また、車両幅方向に沿って路面干渉防止用の保護部材が配置されており、前方側支持部材よりも車両後方側に設けられた後方側支持部材に、保護部材の車両前後方向の後端部が片持ち支持状態で接合されている。保護部材は、車両前後方向の前端部が前方側支持部材と間隔をおいて前方側支持部材の下方まで延設されており、保護部材の前端部は前方側支持部材と接合されていない。これによって、路面の高い突起などの路面干渉物に保護部材が接触したときに、保護部材の前端部が前方側支持部材の下方の間隔内で上方に撓む。このため、保護部材が上方に変形しながら路面干渉物を乗り越すので、路面干渉物が後方側支持部材に当たることが防止又は抑制され、後方側支持部材の損傷が防止又は抑制される。さらに、保護部材の前端部は前方側支持部材、ロアバンパとは分離しているので、保護部材の変形による前方側支持部材及びロアバンパの損傷が防止又は抑制され、ひいては車両部品等の損傷を防止又は抑制することができる。   According to the first aspect of the present invention, the lower bumper is arranged along the vehicle width direction, and the lower bumper is joined to the front support member provided at the lower front side of the front portion of the vehicle. Further, a protection member for preventing road surface interference is disposed along the vehicle width direction, and the rear end portion of the protection member in the vehicle front-rear direction is provided on the rear side support member provided on the vehicle rear side relative to the front side support member. Are joined in a cantilevered state. The front end portion of the protection member in the vehicle front-rear direction extends to the lower side of the front support member at a distance from the front support member, and the front end portion of the protection member is not joined to the front support member. As a result, when the protective member comes into contact with a road surface interference such as a projection having a high road surface, the front end portion of the protective member bends upward within the interval below the front support member. For this reason, since the protective member moves over the road surface interference while deforming upward, the road surface interference is prevented or suppressed from hitting the rear side support member, and damage to the rear side support member is prevented or suppressed. Further, since the front end portion of the protective member is separated from the front side support member and the lower bumper, damage to the front side support member and the lower bumper due to deformation of the protective member is prevented or suppressed, and thus damage to vehicle parts and the like is prevented or reduced. Can be suppressed.

また、ロアバンパの車両後方側の端部には嵌合部が形成されており、車両前部に歩行者等が衝突して所定の衝突荷重が作用すると、ロアバンパが後方側に移動して、嵌合部が保護部材の前端部に形成された被嵌合部と嵌合する。これによって、入力荷重が比較的剛性の高い後方側支持部材に伝達され、適切な荷重でロアバンパが保持される。このため、車両前部に歩行者が衝突した場合に、歩行者の下肢のエネルギーがロアバンパで吸収され、歩行者の下肢に与える衝突反力を低減することができる。   In addition, a fitting part is formed at the vehicle rear side end of the lower bumper, and when a pedestrian or the like collides with the front part of the vehicle and a predetermined collision load acts, the lower bumper moves to the rear side and is fitted. The mating portion is fitted with the fitted portion formed at the front end portion of the protective member. As a result, the input load is transmitted to the relatively rigid rear support member, and the lower bumper is held with an appropriate load. For this reason, when the pedestrian collides with the front part of the vehicle, the energy of the lower limbs of the pedestrian is absorbed by the lower bumper, and the collision reaction force applied to the lower limbs of the pedestrian can be reduced.

請求項2記載の本発明によれば、ロアバンパの嵌合部が凹部で保護部材の被嵌合部が凸部であり、又はロアバンパの嵌合部が凸部で保護部材の被嵌合部が凹部であるので、所定の衝突荷重が作用してロアバンパが後方側に移動したときに、ロアバンパの嵌合部を保護部材の被嵌合部により確実に嵌合させることができる。これによって、入力荷重を比較的剛性の高い後方側支持部材でより確実に受けることができる。   According to the second aspect of the present invention, the fitting part of the lower bumper is a concave part and the fitted part of the protective member is a convex part, or the fitting part of the lower bumper is a convex part and the fitted part of the protective member is a convex part. Since it is a recessed part, when a predetermined | prescribed collision load acts and a lower bumper moves to the back side, the fitting part of a lower bumper can be reliably fitted by the to-be-fitted part of a protection member. As a result, the input load can be more reliably received by the rear support member having a relatively high rigidity.

請求項3記載の本発明によれば、保護部材の後端部が後方側支持部材の下面部に接合されると共に、保護部材の前端部が上方に傾斜するように形成されているので、路面干渉物が保護部材に接触したときに、前端部が橇の役目を果たし、路面干渉物が保護部材の傾斜面を滑りやすく、また保護部材の前端部が上方に撓みやすい。このため、保護部材が上方に変形しながら路面干渉物を乗り越すので、後方側支持部材等の損傷をより一層防止又は抑制することができる。さらに、保護部材の前端部はロアバンパ、前方側支持部材とは分離しているので、保護部材の上方への変形時にロアバンパ、前方側支持部材を損傷させることを防止又は抑制でき、ひいては車両部品等の損傷を防止又は抑制することができる。   According to the third aspect of the present invention, the rear end portion of the protection member is joined to the lower surface portion of the rear support member, and the front end portion of the protection member is formed so as to be inclined upward. When the interference comes into contact with the protection member, the front end portion serves as a saddle, the road surface interference matter easily slides on the inclined surface of the protection member, and the front end of the protection member tends to bend upward. For this reason, since the protection member gets over the road surface interference while being deformed upward, damage to the rear side support member and the like can be further prevented or suppressed. Further, since the front end portion of the protective member is separated from the lower bumper and the front support member, it is possible to prevent or suppress damage to the lower bumper and the front support member when the protective member is deformed upward, and thus vehicle parts, etc. Can be prevented or suppressed.

以上説明したように、請求項1記載の本発明に係る車両下部構造は、路面干渉物から車両部品等を保護することができると共に、歩行者等との衝突により所定の衝突荷重が作用したときに、歩行者等へ与える衝突反力を低減することができるという優れた効果を有する。   As described above, the vehicle lower structure according to the first aspect of the present invention can protect vehicle parts and the like from road surface interferences, and when a predetermined collision load is applied due to a collision with a pedestrian or the like. Moreover, it has the outstanding effect that the collision reaction force given to a pedestrian etc. can be reduced.

請求項2記載の本発明に係る車両下部構造は、衝突時の入力荷重をより確実に後方側支持部材で受けることができ、歩行者等へ与える衝突反力をより一層低減することができるという優れた効果を有する。   The vehicle lower structure according to the second aspect of the present invention can more reliably receive the input load at the time of the collision with the rear support member, and can further reduce the collision reaction force applied to the pedestrian or the like. Has an excellent effect.

請求項3記載の本発明に係る車両下部構造は、路面干渉物が保護部材に当たったときに、車両部品等の損傷をより一層防止又は抑制することができるという優れた効果を有する。   The vehicle lower structure according to the third aspect of the present invention has an excellent effect that damage to vehicle parts and the like can be further prevented or suppressed when a road surface interference hits the protective member.

以下、図1〜図4を用いて、本発明に係る車両下部構造の一実施形態について説明する。なお、これらの図において適宜示される矢印FRは車両前方側を示しており、矢印UPは車両上方側を示している。   Hereinafter, an embodiment of a vehicle lower structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, and an arrow UP indicates the vehicle upper side.

図1には、本実施形態に係る車両下部構造の全体構成が示されている。この図に示されるように、車両前部10には、車両上下方向に沿って延在するラジエータサポートサイド12が設けられている。ラジエータサポートサイド12の下端部には、車両幅方向に沿って前方側支持部材としてのラジエータサポートロアクロス14が掛け渡されている。ラジエータサポートロアクロス14は、断面ハット型に形成されており、車両下部側に開口を有している。ラジエータサポートロアクロス14の前端フランジ部14Aには、幅方向に沿って配置されたロアバンパとしてのバンパロアアブソーバ16の車両前後方向後端側の取付部16Aが接合されている。バンパロアアブソーバ16の接合構造については後述する。また、バンパロアアブソーバ16の車両前後方向前方側には、バンパカバー18が設けられている。   FIG. 1 shows an overall configuration of a vehicle lower structure according to the present embodiment. As shown in this figure, the vehicle front portion 10 is provided with a radiator support side 12 extending along the vehicle vertical direction. A radiator support lower cross 14 as a front support member is stretched over the lower end portion of the radiator support side 12 along the vehicle width direction. The radiator support lower cross 14 is formed in a hat shape in cross section, and has an opening on the vehicle lower side. An attachment portion 16A on the rear end side in the vehicle front-rear direction of a bumper lower absorber 16 as a lower bumper disposed along the width direction is joined to the front end flange portion 14A of the radiator support lower cross 14. The joining structure of the bumper absorber 16 will be described later. A bumper cover 18 is provided on the front side of the bumper lower absorber 16 in the vehicle front-rear direction.

ラジエータサポートロアクロス14より車両前後方向後方側には、車両幅方向の両サイドに後方側支持部材としてのサスペンションメンバフロントクロス20が設けられている。サスペンションメンバフロントクロス20は、サスペンションメンバの一部を構成する部材である。本実施形態では、発明の内容を分かりやすくするためサスペンションメンバフロントクロス20を模式的に表している。サスペンションメンバフロントクロス20は略矩形状の閉断面構造に形成されており、サスペンションメンバフロントクロス20の下面部20Aは、ラジエータサポートロアクロス14の下端部よりも下方に配置されている。サスペンションメンバフロントクロス20の下面部20Aには、路面干渉防止用の保護部材としての路面干渉防止用ブラケット22の車両前後方向後端側の取付部22Aが片持ち支持状態で接合されている。路面干渉防止用ブラケット22の接合構造について後述する。路面干渉防止用ブラケット22は、金属製の部材であり、車両幅方向に沿って配置されている。   Suspension member front crosses 20 as rear side support members are provided on both sides in the vehicle width direction on the rear side in the vehicle longitudinal direction from the radiator support lower cross 14. The suspension member front cross 20 is a member constituting a part of the suspension member. In the present embodiment, the suspension member front cross 20 is schematically shown for easy understanding of the contents of the invention. The suspension member front cross 20 is formed in a substantially rectangular closed cross-sectional structure, and the lower surface portion 20A of the suspension member front cross 20 is disposed below the lower end portion of the radiator support lower cross 14. An attachment portion 22A on the rear end side in the vehicle front-rear direction of a road surface interference prevention bracket 22 as a road surface interference prevention protection member is joined to the lower surface portion 20A of the suspension member front cross 20 in a cantilevered state. The joining structure of the road surface interference preventing bracket 22 will be described later. The road surface interference prevention bracket 22 is a metal member, and is disposed along the vehicle width direction.

バンパロアアブソーバ16は、外形が略L字状に形成された樹脂製の部材であり、下方側に突出するように複数のリブが車両幅方向に沿ってほぼ平行に設けられている。バンパロアアブソーバ16の車両前後方向後端側には、略平面状の取付部16Aが形成されている。バンパロアアブソーバ16の取付部16Aの上面は、ラジエータサポートロアクロス14の前端フランジ部14Aの下面に面接触された状態で、ボルト30がバンパロアアブソーバ16のリブの間に下方側から挿入されて、前端フランジ部14Aの上方側からナット32が螺合されることにより、バンパロアアブソーバ16がラジエータサポートロアクロス14に取付けられている。バンパロアアブソーバ16は、車両側面視にて車両前後方向の前端部16Bが車両前方側に突出しており、前端部16B側の下部に車両前方側が上り勾配となる傾斜面16Cが形成されている。バンパロアアブソーバ16は、車両前後方向の後端部の端面に、車両前方側に窪んだ嵌合部としての凹部16Dが形成されている。バンパカバー18は、略U字状に形成されており、車両後方側に開口部18Aが配置され、車両前方側に湾曲面が配置されている。バンパカバー18の開口部18Aの内側には、バンパロアアブソーバ16の前端部16Bが所定の間隔で挿入されている。   The bumper lower absorber 16 is a resin member whose outer shape is formed in an approximately L shape, and a plurality of ribs are provided substantially in parallel along the vehicle width direction so as to protrude downward. A substantially planar mounting portion 16A is formed on the rear end side of the bumper lower absorber 16 in the vehicle front-rear direction. The upper surface of the mounting portion 16A of the bumper lower absorber 16 is in surface contact with the lower surface of the front end flange portion 14A of the radiator support lower cross 14, and the bolt 30 is inserted between the ribs of the bumper lower absorber 16 from below. The bumper lower absorber 16 is attached to the radiator support lower cross 14 by screwing the nut 32 from above the front end flange portion 14A. The bumper lower absorber 16 has a front end portion 16B in the vehicle front-rear direction protruding from the vehicle front side in a side view of the vehicle, and an inclined surface 16C having an upward slope on the vehicle front side is formed at the lower portion on the front end portion 16B side. In the bumper lower absorber 16, a recess 16D is formed on the end surface of the rear end portion in the vehicle front-rear direction as a fitting portion that is recessed toward the vehicle front side. The bumper cover 18 is formed in a substantially U shape, an opening 18A is disposed on the vehicle rear side, and a curved surface is disposed on the vehicle front side. Inside the opening 18A of the bumper cover 18, the front end portion 16B of the bumper lower absorber 16 is inserted at a predetermined interval.

路面干渉防止用ブラケット22は、略「く」の字状の部材からなり、車両前後方向後端側に略平面状の取付部22Aを備えている。路面干渉防止用ブラケット22の車両前後方向中間部には、車両前後方向に沿って下方側に突出するビード22Bが車両幅方向に複数設けられている。また、路面干渉防止用ブラケット22の車両前後方向の前端部22C側の中間部22Dには、前端部22C側が上り勾配となる傾斜部が形成されており、前端部22Cは中間部22Dから折り曲げられて略平面状に形成されている。   The road surface interference prevention bracket 22 is formed of a substantially “<”-shaped member, and includes a substantially planar mounting portion 22A on the rear end side in the vehicle front-rear direction. A plurality of beads 22B are provided in the vehicle width direction in the vehicle longitudinal direction intermediate portion of the road surface interference prevention bracket 22 so as to protrude downward along the vehicle longitudinal direction. Further, the intermediate portion 22D on the front end portion 22C side in the vehicle front-rear direction of the road surface interference prevention bracket 22 is formed with an inclined portion having an upward slope on the front end portion 22C side, and the front end portion 22C is bent from the intermediate portion 22D. It is formed in a substantially planar shape.

サスペンションメンバフロントクロス20の下面部20Aには、複数のボルト挿通孔が形成されており、その裏面側にウエルドナット34が予め溶着されている。そして、サスペンションメンバフロントクロス20の下面部20Aに路面干渉防止用ブラケット22の取付部22Aの上面が接触された状態で、ボルト36が路面干渉防止用ブラケット22の下方側から挿入されてウエルドナット34に螺合されることにより、路面干渉防止用ブラケット22の取付部22Aがサスペンションメンバフロントクロス20に片持ち支持状態で取付けられている。なお、必ずしもウエルドナット34を使用する必要はなく、通常のナットを用いてもよい。サスペンションメンバフロントクロス20は車両骨格部材であり、剛性の高い部材で形成されている。   A plurality of bolt insertion holes are formed in the lower surface portion 20A of the suspension member front cross 20, and a weld nut 34 is welded to the rear surface side in advance. Then, with the upper surface of the mounting portion 22A of the road surface interference prevention bracket 22 in contact with the lower surface portion 20A of the suspension member front cross 20, the bolt 36 is inserted from the lower side of the road surface interference prevention bracket 22 and the weld nut 34 is inserted. Thus, the mounting portion 22A of the road surface interference prevention bracket 22 is attached to the suspension member front cross 20 in a cantilevered state. The weld nut 34 is not necessarily used, and a normal nut may be used. The suspension member front cross 20 is a vehicle skeleton member, and is formed of a highly rigid member.

路面干渉防止用ブラケット22の前端部22Cは、ラジエータサポートロアクロス14の下方までラジエータサポートロアクロス14と所定の間隔をおいて延設されている。この間隔は、図2に示されるように、路面の高い突起などの路面干渉物50が路面干渉防止用ブラケット22と接触したときに、路面干渉防止用ブラケット22の前端部22C側が上方に撓み変形可能な寸法に設定されている。すなわち、路面干渉防止用ブラケット22の前端部22Cは、ラジエータサポートロアクロス14の前端フランジ部14Aと後端フランジ部14Bとの間の開口部の下方に配置されている。   The front end portion 22C of the road surface interference prevention bracket 22 extends to the lower side of the radiator support lower cross 14 with a predetermined distance from the radiator support lower cross 14. As shown in FIG. 2, when the road surface interference object 50 such as a projection having a high road surface comes into contact with the road surface interference prevention bracket 22, as shown in FIG. 2, the front end portion 22C side of the road surface interference prevention bracket 22 is bent upward and deformed. Set to possible dimensions. That is, the front end portion 22C of the road surface interference prevention bracket 22 is disposed below the opening between the front end flange portion 14A and the rear end flange portion 14B of the radiator support lower cross 14.

路面干渉防止用ブラケット22の前端部22Cの端面には、バンパロアアブソーバ16の凹部16Dと対向する位置に、車両前方側に突出する被嵌合部としての凸部22Eが形成されている。凸部22Eは、車両前方側に突出する板状部材からなり、車両幅方向に沿って設けられており、図3に示されるように、所定の衝突荷重が作用してバンパロアアブソーバ16が車両後方側に移動したときに、バンパロアアブソーバ16の凹部16Dが嵌合可能な位置に形成されている。   On the end surface of the front end portion 22C of the road surface interference preventing bracket 22, a convex portion 22E as a fitted portion that protrudes toward the vehicle front side is formed at a position facing the concave portion 16D of the bumper lower absorber 16. The convex portion 22E is formed of a plate-like member that protrudes toward the front side of the vehicle, and is provided along the vehicle width direction. As shown in FIG. The concave portion 16D of the bumper lower absorber 16 is formed at a position where it can be fitted when moved rearward.

なお、車両前部10の車両前後方向に配置されたバンパロアアブソーバ16と路面干渉防止用ブラケット22の上方側には、車両前部10の両サイドに車両前後方向に沿って延在するフロントサイドメンバが配設されており、フロントサイドメンバの前端部の近傍にラジエータサポートサイド12が車両上下方向に沿って設けられている。また、フロントサイドメンバの下部にサスペンションメンバフロントクロス20が取付けられている。   It should be noted that a front side that extends along the vehicle front-rear direction on both sides of the vehicle front portion 10 is disposed above the bumper lower absorber 16 and the road surface interference prevention bracket 22 disposed in the vehicle front-rear direction of the vehicle front portion 10. A member is provided, and a radiator support side 12 is provided in the vehicle vertical direction in the vicinity of the front end portion of the front side member. A suspension member front cross 20 is attached to the lower part of the front side member.

次に、本実施形態の作用並びに効果について説明する。   Next, the operation and effect of this embodiment will be described.

車両前部10の下部には、路面干渉防止用ブラケット22の取付部22Aがサスペンションメンバフロントクロス20に片持ち支持状態で接合されているので、図2に示されるように、路面の高い突起などの路面干渉物50が路面干渉防止用ブラケット22に接触すると、路面干渉防止用ブラケット22の前端部22C側が上方に撓む。またその際、路面干渉物50が路面干渉防止用ブラケット22の前端部22C側の中間部22Dの傾斜部を滑りやすい。これによって、路面干渉防止用ブラケット22が上方に変形しながら路面干渉物50を乗り越すので、路面干渉物50がサスペンションメンバフロントクロス20に接触してサスペンションメンバフロントクロス20を損傷させることを防止又は抑制することができる。さらに、路面干渉防止用ブラケット22の前端部22Cはバンパロアアブソーバ16、ラジエータサポートロアクロス14と分離している(接合されていない)ので、路面干渉防止用ブラケット22の前端部22Cが上方に撓んだときにバンパロアアブソーバ16、ラジエータサポートロアクロス14を損傷させることを防止又は抑制することができる。これによって、車両前部10内に配置された車両部品等の損傷を防止又は抑制することができる。   Since the attachment portion 22A of the road surface interference prevention bracket 22 is joined to the suspension member front cross 20 in a cantilever support state at the lower portion of the vehicle front portion 10, as shown in FIG. When the road surface interference object 50 comes into contact with the road surface interference prevention bracket 22, the front end portion 22C side of the road surface interference prevention bracket 22 bends upward. Further, at that time, the road surface interference object 50 easily slides on the inclined portion of the intermediate portion 22D on the front end portion 22C side of the road surface interference prevention bracket 22. As a result, the road surface interference preventing bracket 22 is deformed upward and gets over the road surface interference object 50, thereby preventing or suppressing the road surface interference object 50 from contacting the suspension member front cross 20 and damaging the suspension member front cross 20. can do. Further, since the front end portion 22C of the road surface interference preventing bracket 22 is separated (not joined) from the bumper lower absorber 16 and the radiator support lower cross 14, the front end portion 22C of the road surface interference preventing bracket 22 is bent upward. It is possible to prevent or suppress damage to the bumper lower absorber 16 and the radiator support lower cross 14 at the time. As a result, it is possible to prevent or suppress damage to vehicle parts and the like arranged in the vehicle front portion 10.

また、図3に示されるように、車両前部10のバンパカバー18が歩行者の下肢等と衝突して所定の衝突荷重が作用すると、バンパロアアブソーバ16が車両後方側に僅かに移動(後退)して、バンパロアアブソーバ16の車両後端側の凹部16Dが路面干渉防止用ブラケット22の車両前端側の凸部22Eと嵌合する。これによって、図4に示されるように、歩行者の下肢等からの入力荷重Fが剛性の高いサスペンションメンバフロントクロス20に伝達され、適切な荷重でバンパロアアブソーバ16が保持される。このため、車両前部10が歩行者の下肢等と衝突した際に下肢のエネルギーがバンパロアアブソーバ16で吸収され、歩行者の下肢等に与える衝突反力を低減することができる。   Further, as shown in FIG. 3, when the bumper cover 18 of the vehicle front portion 10 collides with the lower limbs of the pedestrian and a predetermined collision load acts, the bumper lower absorber 16 slightly moves (retreats) to the vehicle rear side. ) And the recess 16D on the vehicle rear end side of the bumper lower absorber 16 is fitted with the protrusion 22E on the vehicle front end side of the bracket 22 for preventing road surface interference. As a result, as shown in FIG. 4, the input load F from the lower limbs of the pedestrian is transmitted to the suspension member front cross 20 having high rigidity, and the bumper lower absorber 16 is held with an appropriate load. For this reason, when the vehicle front part 10 collides with the lower limbs of the pedestrian or the like, the energy of the lower limbs is absorbed by the bumper lower absorber 16 and the collision reaction force applied to the pedestrian's lower limbs or the like can be reduced.

一方、第1比較例として、車両前部と歩行者等との衝突時にバンパロアアブソーバを適切な荷重で保持するために路面干渉防止用ブラケットとバンパロアアブソーバとを強固に締結した構成では、バンパロアアブソーバがラジエータサポートロアクロス14とも締結されており、路面干渉物50を乗り越す際に路面干渉防止用ブラケットが上方に撓んでラジエータサポートロアクロス14を上方に押し上げることになり、ラジエータサポートサイド12等を損傷させる可能性がある。   On the other hand, as a first comparative example, in a configuration in which the bumper lower absorber and the bumper lower absorber are firmly fastened in order to hold the bumper lower absorber with an appropriate load in the event of a collision between the vehicle front and a pedestrian or the like, The lower absorber is also fastened to the radiator support lower cross 14, and when passing over the road surface interference object 50, the road surface interference prevention bracket bends upward to push up the radiator support lower cross 14, and the radiator support side 12 and the like. May cause damage.

また、第2比較例として、図1に示されるバンパロアアブソーバ16と路面干渉防止用ブラケット22に凹部16Dと凸部22Eを設けない構成では、バンパカバー18に歩行者等が衝突した際に歩行者の下肢のエネルギーを吸収するため、バンパロアアブソーバを適切な荷重で保持する必要があるが、バンパロアアブソーバはラジエータサポートロアクロス14のみに接合されており、ラジエータサポートロアクロス14単体では保持荷重が低く不十分となる。   Further, as a second comparative example, in the configuration in which the bumper lower absorber 16 and the road surface interference prevention bracket 22 shown in FIG. 1 are not provided with the concave portions 16D and the convex portions 22E, walking is performed when a pedestrian or the like collides with the bumper cover 18. In order to absorb the energy of the lower limbs of a person, it is necessary to hold the bumper lower absorber with an appropriate load. However, the bumper lower absorber is joined only to the radiator support lower cross 14, and the radiator support lower cross 14 alone holds the load. Is low and insufficient.

これに対して、本実施形態では、路面干渉物50を乗り越す際に路面干渉防止用ブラケット22が上方に撓んでもラジエータサポートサイド12等の損傷を防止又は抑制することができると共に、歩行者等と衝突した場合に歩行者の下肢に与える衝突反力を低減して歩行者等を保護することができる。   On the other hand, in this embodiment, when the road surface interference prevention bracket 22 bends upward when overcoming the road surface interference object 50, damage to the radiator support side 12 and the like can be prevented or suppressed, and a pedestrian or the like can be prevented. It is possible to protect the pedestrian and the like by reducing the collision reaction force applied to the lower limb of the pedestrian in the event of a collision.

〔実施形態の補足説明〕   [Supplementary explanation of the embodiment]

上述した実施形態では、バンパロアアブソーバ16の嵌合部が凹部16Dで路面干渉防止用ブラケット22の被嵌合部が凸部22Eであったが、これに限定されず、他の構成でもよい。例えば、バンパロアアブソーバ16の嵌合部が凸部で路面干渉防止用ブラケット22の被嵌合部が凹部である場合にも、所定の衝突荷重が作用してバンパロアアブソーバ16が車両後方側に移動したときに、バンパロアアブソーバ16の凸部を路面干渉防止用ブラケット22の凹部に嵌合させることができる。また、上述した実施形態では、凹部16Dと凸部22Eは車両幅方向のほぼ全長に設けられているが、これに限らず、車両幅方向に沿って複数設けられる構成でもよい。また、バンパロアアブソーバ16の嵌合部と路面干渉防止用ブラケット22の被嵌合部は、凹部と凸部に限らず、両者が嵌合可能な形状であれば、他の形状でもよい。   In the embodiment described above, the fitting portion of the bumper lower absorber 16 is the concave portion 16D and the fitted portion of the road surface interference preventing bracket 22 is the convex portion 22E. However, the present invention is not limited to this, and other configurations may be used. For example, even when the fitting portion of the bumper lower absorber 16 is a convex portion and the fitted portion of the bracket 22 for preventing road surface interference is a concave portion, a predetermined collision load acts and the bumper lower absorber 16 is moved to the vehicle rear side. When the bumper lower absorber 16 moves, the convex portion of the bumper lower absorber 16 can be fitted into the concave portion of the road surface interference prevention bracket 22. Further, in the above-described embodiment, the concave portion 16D and the convex portion 22E are provided over substantially the entire length in the vehicle width direction. Further, the fitting portion of the bumper lower absorber 16 and the fitted portion of the road surface interference preventing bracket 22 are not limited to the concave portion and the convex portion, but may be any other shape as long as both can be fitted.

上述した実施形態では、前方側支持部材がラジエータサポートロアクロス14で、後方側支持部材がサスペンションメンバフロントクロス20であったが、この構成に限らず、バンパロアアブソーバ16を他の前方側支持部材に、路面干渉防止用ブラケット22を他の後方側支持部材に接合する構成であってもよい。
上記した実施形態では、車両前部10に本発明を適用したが、車両のリア側にも本発明を適用可能である。
In the embodiment described above, the front support member is the radiator support lower cross 14 and the rear support member is the suspension member front cross 20. However, the present invention is not limited to this configuration, and the bumper lower absorber 16 is replaced with another front support member. Moreover, the structure which joins the bracket 22 for road surface interference prevention to another back side support member may be sufficient.
In the above-described embodiment, the present invention is applied to the vehicle front portion 10, but the present invention can also be applied to the rear side of the vehicle.

一実施形態に係る車両下部構造の全体構成を示す側断面図である。1 is a side cross-sectional view illustrating an overall configuration of a vehicle lower structure according to an embodiment. 路面干渉物が路面干渉防止用ブラケットに接触したときの状態を示す側断面図である。It is a sectional side view which shows a state when a road surface interference thing contacts the bracket for road surface interference prevention. 所定の衝突荷重が作用したときのバンパロアアブソーバ、路面干渉防止用ブラケットの状態を示す側断面図である。It is a sectional side view showing the state of a bumper lower absorber and a road surface interference prevention bracket when a predetermined collision load is applied. 所定の衝突荷重が作用したときのバンパロアアブソーバ、路面干渉防止用ブラケットの状態を示す側断面図である。It is a sectional side view showing the state of a bumper lower absorber and a road surface interference prevention bracket when a predetermined collision load is applied.

符号の説明Explanation of symbols

10 車両前部
14 ラジエータサポートロアクロス(前方側支持部材)
14A 前端フランジ部(前方側支持部材の下面部)
14B 後端フランジ部(前方側支持部材の下面部)
16 バンパロアアブソーバ
16D 凹部(嵌合部)
20 サスペンションメンバフロントクロス(後方側支持部材)
20A 下面部(後方側支持部材の下面部)
22 路面干渉防止用ブラケット(保護部材)
22A 取付部
22E 凸部(被嵌合部)
10 Vehicle front 14 Radiator support lower cross (front support member)
14A Front end flange portion (lower surface portion of front support member)
14B Rear end flange portion (lower surface portion of front support member)
16 Bumper lower absorber 16D Recess (Fitting part)
20 Suspension member front cross (back support member)
20A lower surface part (lower surface part of rear side support member)
22 Bracket for preventing road surface interference (protective member)
22A Mounting part 22E Convex part (fitting part)

Claims (3)

車両前部の前方側下部に設けられた前方側支持部材と、
前記前方側支持部材よりも車両後方側に設けられた後方側支持部材と、
前記前方側支持部材に接合され、車両幅方向に沿って配置されると共に、車両後方側の端部に嵌合部が形成されたロアバンパと、
車両幅方向に沿って配置されると共に車両前後方向の後端部が前記後方側支持部材に片持ち支持状態で接合され、車両前後方向の前端部が前記前方側支持部材と間隔をおいて前記前方側支持部材の下方まで延設され、所定の衝突荷重が作用して前記ロアバンパが後方側に移動したときに前記嵌合部と嵌合する被嵌合部が前記前端部に形成された路面干渉防止用の保護部材と、
を有することを特徴とする車両下部構造。
A front support member provided at a lower front side of the front of the vehicle;
A rear side support member provided on the vehicle rear side of the front side support member;
A lower bumper joined to the front support member and arranged along the vehicle width direction, and having a fitting portion formed at an end on the vehicle rear side,
The rear end portion in the vehicle longitudinal direction is disposed along the vehicle width direction and is joined to the rear support member in a cantilevered state, and the front end portion in the vehicle front / rear direction is spaced from the front support member. A road surface that extends to the lower side of the front support member and that has a fitting portion that fits the fitting portion when the lower bumper moves to the rear side due to a predetermined collision load. A protective member for preventing interference;
A vehicle lower structure comprising:
前記嵌合部が凹部で前記被嵌合部が凸部であり、又は前記嵌合部が凸部で前記被嵌合部が凹部であることを特徴とする請求項1に記載の車両下部構造。   The vehicle lower part structure according to claim 1, wherein the fitting portion is a concave portion and the fitted portion is a convex portion, or the fitting portion is a convex portion and the fitted portion is a concave portion. . 前記後方側支持部材の下面部が前記前方側支持部材の下面部よりも下方に配置され、
前記保護部材は、前記後端部が前記後方側支持部材の下面部に接合されると共に、前記前端部が上方に傾斜するように形成されていることを特徴とする請求項1又は請求項2に記載の車両下部構造。
The lower surface portion of the rear side support member is disposed below the lower surface portion of the front side support member,
The said protection member is formed so that the said rear-end part may be joined to the lower surface part of the said back side support member, and the said front-end part may incline upwards. The vehicle lower structure described in 1.
JP2007301427A 2007-11-21 2007-11-21 Vehicle lower part structure Pending JP2009126266A (en)

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JP2007301427A JP2009126266A (en) 2007-11-21 2007-11-21 Vehicle lower part structure

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JP2007301427A JP2009126266A (en) 2007-11-21 2007-11-21 Vehicle lower part structure

Publications (1)

Publication Number Publication Date
JP2009126266A true JP2009126266A (en) 2009-06-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9834256B2 (en) 2015-07-31 2017-12-05 Toyota Jidosha Kabushiki Kaisha Vehicle lower portion structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9834256B2 (en) 2015-07-31 2017-12-05 Toyota Jidosha Kabushiki Kaisha Vehicle lower portion structure

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