JP2008265417A

JP2008265417A - Vehicle front structure

Info

Publication number: JP2008265417A
Application number: JP2007108206A
Authority: JP
Inventors: Akiyoshi Watanabe; 明義渡辺; Yutaka Yamada; 山田　　豊
Original assignee: Sumitomo Light Metal Industries Ltd; Toyota Motor Corp
Current assignee: Sumitomo Light Metal Industries Ltd; Toyota Motor Corp
Priority date: 2007-04-17
Filing date: 2007-04-17
Publication date: 2008-11-06

Abstract

PROBLEM TO BE SOLVED: To obtain a vehicle front structure which can protect vehicle parts and the like from an interfering article on a road, does not obstruct the deformation of a shock absorbing member upon frontal collision, and can reduce a load input amount to an opponent vehicle. SOLUTION: At a front portion 10A of a vehicle 10, a radiator support lower cross 16 is arranged in a vehicle width direction, and a suspension member front cross 22B is arranged on a lower side than the radiator support lower cross 16. On an upper surface portion 16A of the radiator support lower cross 16, a mounting portion 32 of a front end portion 30A of a protecting member 30 is joined. On a lower surface portion 22C of a suspension member front cross 22B, mounting portions 34, 35 near a middle portion 30B of the protecting portion 30 are joined. The protecting member 30 is formed in an arch-shape curved downward in a concave shape, from the front end portion 30A of the protecting member 30 to the middle portion 30. COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、車両の前部の下部に保護部材を備えた車両前部構造に関する。 The present invention relates to a vehicle front portion structure including a protection member at a lower portion of a front portion of a vehicle.

下記特許文献１には、前面衝突時に発生する車両の損傷を低減するために、バンパカバーの下部と車体とを連結する連結部材を設け、歩行者の衝突荷重よりも大きな荷重が作用した場合に、連結部材と車体との固定を解除する固定手段を設けた構造が開示されている。
特開２００４−２０３１８３号公報 In Patent Document 1 below, in order to reduce vehicle damage that occurs during a frontal collision, a connecting member that connects the lower part of the bumper cover and the vehicle body is provided, and a load larger than the pedestrian collision load is applied. A structure in which fixing means for releasing the connection between the connecting member and the vehicle body is provided is disclosed.
Japanese Patent Laid-Open No. 2004-203183

しかしながら、上記先行技術による場合、前面衝突時に連結部材の支持部を介して入力を受けたときに、支持部間で抗力が発生すると、連結部材と車体との固定が解除されにくい。 However, in the case of the above prior art, when a drag is generated between the support portions when an input is received through the support portion of the connection member at the time of a frontal collision, it is difficult to release the connection between the connection member and the vehicle body.

一般的に、連結部材は路上干渉物からの車両部品等の保護を目的とするため、強固な部材が用いられている。そのため、前面衝突時に連結部材が突っ張ることにより、相手車両への荷重入力量が増加し、また、前面衝突時に設定された衝撃吸収部材の変形を阻害する可能性がある。 In general, the connecting member is a strong member for the purpose of protecting vehicle parts and the like from roadside interferences. Therefore, when the connecting member is stretched at the time of the frontal collision, the load input amount to the opponent vehicle increases, and there is a possibility that the deformation of the shock absorbing member set at the time of the frontal collision is inhibited.

本発明は上記事実を考慮し、路上干渉物から車両部品等を保護することができると共に、前面衝突時に衝撃吸収部材の変形を阻害せず、ひいては相手車両への荷重入力量を低減することができる車両前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 obstacles on the road, and does not hinder the deformation of the shock absorbing member at the time of a frontal collision, thereby reducing the load input amount to the opponent vehicle. The object is to obtain a vehicle front structure that can be made.

請求項１の発明に係る車両前部構造は、車両の前部に車両幅方向に沿ってそれぞれ設けられると共に車両前後方向に離間して配置され、車両前後方向の後方側が前方側よりも下方に配置された一対の支持部材と、車両の前部の下部に前記一対の支持部材の間に掛け渡すように設けられると共に、下方に凹状に湾曲したアーチ形状に形成され、車両の前部の車両部品が路上干渉物と接触するのを防止する保護部材と、を有することを特徴とする。 The vehicle front structure according to the first aspect of the present invention is provided at the front portion of the vehicle along the vehicle width direction and spaced apart in the vehicle front-rear direction, with the rear side in the vehicle front-rear direction being lower than the front side. A pair of support members disposed and a lower part of the front part of the vehicle are provided so as to span between the pair of support members, and are formed in an arch shape curved in a concave shape downward, and the vehicle in the front part of the vehicle And a protective member for preventing the part from coming into contact with an obstacle on the road.

請求項２の発明は、請求項１に記載の車両前部構造において、前記保護部材の一端側が前記前方側の支持部材の上面部に接合され、前記保護部材の中間部又は他端側が前記後方側の支持部材の下面部に接合されていることを特徴とする。 According to a second aspect of the present invention, in the vehicle front structure according to the first aspect, one end side of the protection member is joined to an upper surface portion of the front support member, and an intermediate portion or the other end side of the protection member is the rear side. It is characterized by being joined to the lower surface portion of the side support member.

請求項３の発明は、請求項１又は請求項２に記載の車両前部構造において、前記保護部材の中間部又は他端側が、所定値以上の衝突荷重が作用した場合に前記後方側の支持部材に離脱可能に接合されていることを特徴とする。 According to a third aspect of the present invention, in the vehicle front structure according to the first or second aspect, the intermediate portion or the other end side of the protective member supports the rear side when a collision load of a predetermined value or more is applied. It is characterized by being detachably joined to the member.

請求項１記載の本発明によれば、車両の前部に車両幅方向に沿って、車両前後方向の後方側が前方側よりも下方に配置された一対の支持部材が設けられており、車両の前部の下部には、一対の支持部材の間に掛け渡たすように保護部材が配設されている。保護部材は、下方に凹状に湾曲したアーチ形状であるので、路上干渉物の接触による入力時には、保護部材の有する剛性により荷重が分散され、保護部材の変形が防止される。このため、車両の前部の車両部品等が路上干渉物と接触することがなく、車両部品等を保護することができる。 According to the first aspect of the present invention, a pair of support members, in which the rear side in the vehicle front-rear direction is disposed below the front side along the vehicle width direction, are provided at the front of the vehicle. A protective member is disposed under the front portion so as to span between the pair of support members. Since the protective member has an arch shape that is concavely curved downward, the load is dispersed by the rigidity of the protective member at the time of input by contact with a roadside interference object, and deformation of the protective member is prevented. For this reason, the vehicle part etc. of the front part of a vehicle do not contact with a road interference object, and can protect a vehicle part etc.

一方、前面衝突時に、衝突荷重により前方側の支持部材が後退すると、アーチ形状の保護部材が下方側に凹状に湾曲するように変形し、前方側の支持部材と後方側の支持部材間での抗力の発生が抑制される。これにより、前方側と後方側の支持部材間での保護部材の突っ張りが抑制されるので、前面衝突時に予め設定された衝撃吸収部材が円滑に変形する。すなわち、衝撃吸収部材の変形が阻害されることはない。その結果、相手車両への荷重入力量も低減される。 On the other hand, when the front support member retreats due to a collision load at the time of a frontal collision, the arch-shaped protective member is deformed so as to be concaved downward, and between the front support member and the rear support member. Generation of drag is suppressed. Thereby, since the tension of the protective member between the front side support member and the rear side support member is suppressed, the impact absorbing member set in advance at the time of a frontal collision is smoothly deformed. That is, the deformation of the shock absorbing member is not hindered. As a result, the load input amount to the opponent vehicle is also reduced.

請求項２記載の本発明によれば、保護部材の一端側が前方側の支持部材の上面部に接合され、保護部材の中間部又は他端側が後方側の支持部材の下面部に接合されているので、保護部材の一端側付近を下方に凹状に大きく湾曲させるように形成することができる。このため、前面衝突時に前方側の支持部材が後退すると、保護部材を下方側に凹状により大きく湾曲するように変形させることができ、前方側の支持部材と後方側の支持部材間での抗力の発生がより一層抑制される。従って、前方側と後方側の支持部材間での保護部材の突っ張りがより一層抑制され、衝撃吸収部材が円滑に変形すると共に、相手車両への荷重入力量がより一層低減される。 According to the second aspect of the present invention, one end side of the protection member is joined to the upper surface portion of the front support member, and the intermediate portion or the other end side of the protection member is joined to the lower surface portion of the rear support member. Therefore, it can form so that the one end side vicinity of a protection member may be greatly curved concavely downward. For this reason, when the front support member is retracted during a frontal collision, the protection member can be deformed to be greatly curved downward due to the concave shape, and drag between the front support member and the rear support member can be reduced. Occurrence is further suppressed. Therefore, the tension of the protective member between the front and rear support members is further suppressed, the impact absorbing member is smoothly deformed, and the load input amount to the counterpart vehicle is further reduced.

請求項３記載の本発明によれば、所定値以上の衝突荷重が作用した場合に、保護部材の変形抵抗により保護部材と後方側の支持部材との接合部分が離脱し、保護部材が脱落する。このため、前方側と後方側の支持部材間での保護部材の突っ張りがなくなり、衝撃吸収部材を狙い通りに変形させることができる。その結果、相手車両への荷重入力量がより確実に低減される。 According to the third aspect of the present invention, when a collision load of a predetermined value or more is applied, the joint portion between the protective member and the rear support member is released due to the deformation resistance of the protective member, and the protective member falls off. . For this reason, there is no tension of the protective member between the support members on the front side and the rear side, and the shock absorbing member can be deformed as intended. As a result, the load input amount to the opponent vehicle is more reliably reduced.

以上説明したように、請求項１記載の本発明に係る車両前部構造は、路上干渉物から車両部品等を保護することができると共に、前面衝突時に衝撃吸収部材の変形を阻害せず、ひいては相手車両への荷重入力量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 front structure according to the first aspect of the present invention can protect vehicle parts and the like from roadside obstacles and does not hinder the deformation of the shock absorbing member at the time of a frontal collision. It has the outstanding effect that the load input amount to the other party vehicle can be reduced.

請求項２記載の本発明に係る車両前部構造は、前面衝突時に衝撃吸収部材を円滑に変形させることができると共に、相手車両への荷重入力量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 front structure according to the present invention as set forth in claim 2 is capable of smoothly deforming the impact absorbing member at the time of a frontal collision, and is capable of further reducing the load input amount to the opponent vehicle. Have

請求項３記載の本発明に係る車両前部構造は、前面衝突時に衝撃吸収部材を狙い通りに変形させることができると共に、相手車両への荷重入力量をより確実に低減することができるという優れた効果を有する。 The vehicle front structure according to the third aspect of the present invention is excellent in that the impact absorbing member can be deformed as intended at the time of a frontal collision and the load input amount to the opponent vehicle can be more reliably reduced. It has the effect.

以下、図１〜図７を用いて、本発明に係る車両前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 front 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前部構造の全体構成が示されている。また、図２には、本実施形態に係る車両前部構造の要部である保護部材の取付構造が示されている。これらの図に示されるように、車両１０の前部１０Ａの両サイドには、車両前後方向に沿って延在するフロントサイドメンバ１２が配設されている。フロントサイドメンバ１２の前端部１２Ａの近傍には、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１４が設けられている。ラジエータサポートサイド１４の下端部１４Ａには、車両幅方向に沿って前方側の支持部材としてのラジエータサポートロアクロス１６が掛け渡されている。フロントサイドメンバ１２の前端部１２Ａには、筒状のクラッシュボックス１８が連結されている。左右一対のクラッシュボックス１８の前端部は、車両幅方向に沿って延在する断面「目」の字状のフロントバンパリインフォースメント２０にそれぞれ固定されている。なお、フロントサイドメンバ１２及びクラッシュボックス１８は、例えば、アルミニウムの押出し成形品からなる断面矩形状の閉断面構造とされている。 FIG. 1 shows an overall configuration of a vehicle front structure according to the present embodiment. FIG. 2 shows a mounting structure for a protective member, which is a main part of the vehicle front structure according to the present embodiment. As shown in these drawings, front side members 12 extending along the vehicle front-rear direction are disposed on both sides of the front portion 10A of the vehicle 10. In the vicinity of the front end portion 12A of the front side member 12, a radiator support side 14 extending in the vehicle vertical direction is provided. A radiator support lower cross 16 as a support member on the front side is stretched over the lower end portion 14A of the radiator support side 14 along the vehicle width direction. A cylindrical crash box 18 is connected to the front end portion 12 A of the front side member 12. The front end portions of the pair of left and right crash boxes 18 are respectively fixed to front bumper reinforcements 20 having a cross-section “eyes” shape extending along the vehicle width direction. The front side member 12 and the crash box 18 have, for example, a closed cross-sectional structure having a rectangular cross section made of an extruded product of aluminum.

また、ラジエータサポートロアクロス１６よりも車両後方側のフロントサイドメンバ１２の下部には、サスペンションメンバ２２が取付けられている。サスペンションメンバ２２は、上端部２２Ａがフロントサイドメンバ１２に接合されており、下端部に車両幅方向に沿って掛け渡される後方側の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２２Ｂを備えている。ラジエータサポートロアクロス１６とサスペンションメンバフロントクロス２２Ｂとは車両前後方向に離間して配置されると共に、後方側のサスペンションメンバフロントクロス２２Ｂが前方側のラジエータサポートロアクロス１６よりも下方に配置されている。 A suspension member 22 is attached to the lower part of the front side member 12 on the rear side of the vehicle with respect to the radiator support lower cross 16. The suspension member 22 has an upper end portion 22A joined to the front side member 12, and includes a suspension member front cross 22B as a support member on the rear side that spans the lower end portion along the vehicle width direction. The radiator support lower cross 16 and the suspension member front cross 22B are spaced apart from each other in the vehicle front-rear direction, and the rear suspension member front cross 22B is disposed below the front radiator support lower cross 16. .

ラジエータサポートロアクロス１６は、上方側に配置されたアッパクロスメンバ２６と、下方側に配置されたロアクロスメンバ２８とで構成されており、両者の前後のフランジ部２６Ａ、２８Ａ同士がスポット溶接されることにより閉断面構造に形成されている。サスペンションメンバフロントクロス２２Ｂは、下部が略平面状で上部が略山形の閉断面構造に形成されている。 The radiator support lower cross 16 includes an upper cross member 26 disposed on the upper side and a lower cross member 28 disposed on the lower side. The front and rear flange portions 26A and 28A are spot-welded to each other. Thus, a closed cross-sectional structure is formed. The suspension member front cross 22B is formed in a closed cross-sectional structure having a substantially flat lower portion and a substantially chevron upper portion.

サスペンションメンバフロントクロス２２Ｂの下面部２２Ｃは、ラジエータサポートロアクロス１６の上面部１６Ａよりも下方に位置している。ラジエータサポートロアクロス１６の上面部１６Ａとサスペンションメンバフロントクロス２２Ｂの下面部２２Ｃとの間には、後述する路上干渉物５０（図５参照）と車両部品４２、４３、４４との接触を防止するための保護部材３０が掛け渡されている。図３及び図４に示されるように、保護部材３０は、車両前後方向の前方端部３０Ａから中間部３０Ｂ付近までの車両幅方向の長さがほぼ同じに形成されており、前方端部３０Ａ及び中間部３０Ｂよりも後方端部３０Ｃの車両幅方向の長さが長く形成されている。保護部材３０は、前方端部３０Ａに対して中間部３０Ｂ及び後方端部３０Ｃが下方側に位置しており、前方端部３０Ａから中間部３０Ｂ付近までが下方に凹状に湾曲したアーチ形状に形成されている。 The lower surface portion 22C of the suspension member front cross 22B is located below the upper surface portion 16A of the radiator support lower cross 16. Between the upper surface portion 16A of the radiator support lower cross 16 and the lower surface portion 22C of the suspension member front cross 22B, contact between an on-road interference object 50 (see FIG. 5) described later and the vehicle parts 42, 43, and 44 is prevented. A protective member 30 is stretched over. As shown in FIGS. 3 and 4, the protection member 30 is formed with substantially the same length in the vehicle width direction from the front end 30A in the vehicle front-rear direction to the vicinity of the intermediate portion 30B, and the front end 30A. Further, the length in the vehicle width direction of the rear end portion 30C is formed longer than the intermediate portion 30B. The protective member 30 has an intermediate portion 30B and a rear end portion 30C located on the lower side with respect to the front end portion 30A, and is formed in an arch shape that is curved downwardly concavely from the front end portion 30A to the vicinity of the intermediate portion 30B. Has been.

保護部材３０の前方端部３０Ａには、車両幅方向の中央部と両端部の３箇所に、下方に凸状に突出した取付部３２が形成されている。取付部３２にはそれぞれボルト挿通孔３３が形成されており、またアッパクロスメンバ２６の上面部１６Ａには、車両幅方向の３箇所にボルト挿通孔２７が形成されている。そして、アッパクロスメンバ２６の上面部１６Ａに保護部材３０の取付部３２が載置された状態で、ボルト３８がアッパクロスメンバ２６の下方側から挿入されて、保護部材３０の上方側からナット３９が螺合されることにより、保護部材３０の取付部３２がアッパクロスメンバ２６に取付けられている。 The front end portion 30A of the protection member 30 is formed with mounting portions 32 that protrude downward in a convex manner at three locations in the center and both ends in the vehicle width direction. Bolt insertion holes 33 are respectively formed in the attachment portions 32, and bolt insertion holes 27 are formed in the upper surface portion 16 A of the upper cross member 26 at three locations in the vehicle width direction. Then, with the mounting portion 32 of the protection member 30 placed on the upper surface portion 16A of the upper cross member 26, the bolt 38 is inserted from the lower side of the upper cross member 26, and the nut 39 is inserted from the upper side of the protection member 30. Are attached to the upper cross member 26. As shown in FIG.

保護部材３０の中間部３０Ｂには、車両幅方向の中央部と両端部の３箇所に上方に凸状に突出した取付部３４、３５が形成されている。取付部３４、３５にはそれぞれボルト挿通孔３３が形成されている。また、サスペンションメンバフロントクロス２２Ｂの下面部２２Ｃには、車両幅方向の３箇所にボルト挿通孔２３が形成されており、更にその裏面側にはウエルドナット４０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２２Ｂの下面部２２Ｃに保護部材３０の取付部３４、３５が面接触された状態で、ボルト３８が保護部材３０の下方側から挿入されてウエルドナット４０に螺合されることにより、保護部材３０の取付部３４、３５がサスペンションメンバフロントクロス２２Ｂに取付けられている。なお、必ずしもウエルドナット４０を使用する必要はなく、通常のナットを用いてもよい。 The intermediate part 30B of the protection member 30 is formed with mounting parts 34 and 35 protruding upward in three locations, that is, the central part and both end parts in the vehicle width direction. Bolt insertion holes 33 are formed in the attachment portions 34 and 35, respectively. Also, bolt insertion holes 23 are formed at three locations in the vehicle width direction on the lower surface portion 22C of the suspension member front cross 22B, and a weld nut 40 is welded in advance to the back surface thereof. The bolt 38 is inserted from the lower side of the protective member 30 and screwed into the weld nut 40 in a state where the mounting portions 34 and 35 of the protective member 30 are in surface contact with the lower surface portion 22C of the suspension member front cross 22B. Thus, the attachment portions 34 and 35 of the protection member 30 are attached to the suspension member front cross 22B. Note that the weld nut 40 is not necessarily used, and a normal nut may be used.

保護部材３０の取付部３４、３５とサスペンションメンバフロントクロス２２Ｂの下面部２２Ｃとのボルト３８とウエルドナット４０による接合部分は、所定値以上の衝突荷重が作用したときに破断可能に構成されている。 The joint portions of the attachment portions 34 and 35 of the protection member 30 and the lower surface portion 22C of the suspension member front cross 22B by the bolt 38 and the weld nut 40 are configured to be ruptured when a collision load of a predetermined value or more is applied. .

また、保護部材３０の後方端部３０Ｃには、上方に凸状の突出する取付部３６が形成されており、取付部３６に複数のボルト挿通孔３３が形成されている。保護部材３０の取付部３６は、サスペンションメンバフロントクロス２２Ｂより後方側に配置されたサスペンションメンバリアクロス２４（図１参照）の下面部に面接触された状態で、ボルト３８とウエルドナット４０によって取付けられている。これによって、ラジエータサポートロアクロス１６とサスペンションメンバフロントクロス２２Ｂとサスペンションメンバリアクロス２４との間に保護部材３０が掛け渡され、車両１０の前部１０Ａの下部が保護部材３０によって覆われた状態となっている。 Further, the rear end portion 30 C of the protection member 30 is formed with an upwardly projecting mounting portion 36, and a plurality of bolt insertion holes 33 are formed in the mounting portion 36. The attachment portion 36 of the protection member 30 is attached by a bolt 38 and a weld nut 40 while being in surface contact with the lower surface portion of the suspension member rear cross 24 (see FIG. 1) disposed rearward of the suspension member front cross 22B. It has been. As a result, the protective member 30 is spanned between the radiator support lower cross 16, the suspension member front cross 22B, and the suspension member rear cross 24, and the lower portion of the front portion 10A of the vehicle 10 is covered with the protective member 30. It has become.

また、図２に示されるように、車両１０の前部１０Ａのエンジンルーム４６内には、保護部材３０の上方部にラジエータロアタンク、ＥＰＳなどの複数の車両部品４２、４３、４４が配設されている。 As shown in FIG. 2, a plurality of vehicle parts 42, 43, and 44 such as a radiator lower tank and EPS are disposed in the upper part of the protection member 30 in the engine room 46 of the front portion 10 A of the vehicle 10. ing.

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１０の前部１０Ａの下部には、ラジエータサポートロアクロス１６とサスペンションメンバフロントクロス２２Ｂとの間に、下方に凹状に湾曲したアーチ形状の保護部材３０が掛け渡されているので、図５に示されるように、路上干渉物５０が保護部材３０に接触すると、保護部材３０の有する剛性により路上干渉物５０からの入力時の荷重が矢印方向に分散される。また、保護部材３０をアーチ形状とすることで、路上干渉物５０が滑りやすくなる。このため、保護部材３０の変形が防止される。従って、保護部材３０の上方部の車両部品４２、４３、４４等が路上干渉物５０と接触することがなく、車両部品４２、４３、４４等を保護することができる。 An arch-shaped protective member 30 that is curved in a concave shape is suspended between the radiator support lower cross 16 and the suspension member front cross 22B at the lower portion of the front portion 10A of the vehicle 10. As shown, when the roadside interference object 50 comes into contact with the protection member 30, the load at the time of input from the roadside interference object 50 is dispersed in the direction of the arrow due to the rigidity of the protection member 30. Moreover, the interference member 50 on a road becomes easy to slide by making the protection member 30 into an arch shape. For this reason, deformation of the protection member 30 is prevented. Therefore, the vehicle parts 42, 43, 44 and the like above the protection member 30 do not come into contact with the roadside interference object 50, and the vehicle parts 42, 43, 44, etc. can be protected.

一方、図６に示されるように、車両１０の前部１０Ａが相手車両等の衝突体５２に前面衝突すると、ラジエータサポートサイド１４を介してラジエータサポートロアクロス１６に衝突荷重が入力される。図６及び図７に示されるように、この衝突荷重によってラジエータサポートロアクロス１６が矢印Ａ方向に後退すると、アーチ形状の保護部材３０が矢印Ｂに示すように下方側に凹状に湾曲するように変形し、ラジエータサポートロアクロス１６とサスペンションメンバフロントクロス２２Ｂ間での抗力の発生が抑制される。 On the other hand, as shown in FIG. 6, when the front portion 10 A of the vehicle 10 collides frontally with a collision body 52 such as an opponent vehicle, a collision load is input to the radiator support lower cross 16 via the radiator support side 14. As shown in FIGS. 6 and 7, when the radiator support lower cross 16 is retracted in the direction of arrow A due to this collision load, the arch-shaped protection member 30 is curved in a concave shape downward as indicated by arrow B. It deform | transforms and generation | occurrence | production of the drag between the radiator support lower cross 16 and the suspension member front cross 22B is suppressed.

また、このときの保護部材３０の変形抵抗により、矢印Ｃに示すように保護部材３０とサスペンションメンバフロントクロス２２Ｂとのボルト３８とウエルドナット４０による接合部分を破断させるような力が作用し、保護部材３０が脱落する。すなわち、前面衝突時にラジエータサポートロアクロス１６を介して保護部材３０に衝突荷重が入力されたときに、衝突荷重を保護部材３０とサスペンションメンバフロントクロス２２Ｂとの破断荷重に転換することで、両者の接合部の破断を容易にする。保護部材３０が脱落することで、ラジエータサポートロアクロス１６とサスペンションメンバフロントクロス２２Ｂ間での保護部材３０の突っ張りがなくなり、ラジエータサポートロアクロス１６とサスペンションメンバフロントクロス２２Ｂ間の上方部に配置されたクラッシュボックス１８及びフロントサイドメンバ１２の前端側の変形を阻害しない。従って、図１に示すフロントバンパリインフォースメント２０の車両後方側に配置されたクラッシュボックス１８が変形し、更にその車両後方側のフロントサイドメンバ１２を狙い通りに変形させることにより衝撃を吸収することができる。その結果、衝突体５２への荷重入力量が低減される（衝突体５２へ作用する反力が低減される）。 Further, due to the deformation resistance of the protection member 30 at this time, as shown by an arrow C, a force that breaks the joint portion between the protection member 30 and the suspension member front cross 22B by the bolt 38 and the weld nut 40 acts. The member 30 falls off. That is, when a collision load is input to the protective member 30 via the radiator support lower cross 16 at the time of a frontal collision, the collision load is converted into a breaking load between the protective member 30 and the suspension member front cross 22B, thereby It facilitates breakage of the joint. Since the protective member 30 falls off, the protective member 30 is not stretched between the radiator support lower cross 16 and the suspension member front cross 22B, and is disposed above the radiator support lower cross 16 and the suspension member front cross 22B. The deformation of the front end side of the crash box 18 and the front side member 12 is not hindered. Accordingly, the crash box 18 arranged on the vehicle rear side of the front bumper reinforcement 20 shown in FIG. 1 is deformed, and the front side member 12 on the vehicle rear side is further deformed as intended to absorb the impact. it can. As a result, the load input amount to the collision body 52 is reduced (reaction force acting on the collision body 52 is reduced).

また、保護部材３０の前方端部３０Ａの取付部３２がラジエータサポートロアクロス１６の上面部１６Ａに接合され、保護部材３０の中間部３０Ｂ付近の取付部３４、３５がサスペンションメンバフロントクロス２２Ｂの下面部２２Ｃに接合されているので、保護部材３０の前方端部３０Ａ付近を下方に凹状に大きく湾曲させるように形成することができる。このため、前面衝突時にラジエータサポートロアクロス１６が矢印Ａ方向に後退すると、保護部材３０を下方側に凹状に大きく湾曲するように変形させることができ、保護部材３０の前方端部３０Ａをラジエータサポートロアクロス１６の下面部に接合した場合に比べて、ラジエータサポートロアクロス１６とサスペンションメンバフロントクロス２２Ｂ間での抗力の発生をより一層抑制できる。さらに、保護部材３０とサスペンションメンバフロントクロス２２Ｂとの接合部分をより確実に破断させることができる。 Further, the attachment portion 32 of the front end portion 30A of the protection member 30 is joined to the upper surface portion 16A of the radiator support lower cross 16, and the attachment portions 34 and 35 near the intermediate portion 30B of the protection member 30 are the lower surface of the suspension member front cross 22B. Since it is joined to the portion 22C, the vicinity of the front end portion 30A of the protective member 30 can be formed to be greatly curved concavely downward. For this reason, when the radiator support lower cross 16 retreats in the direction of the arrow A at the time of a frontal collision, the protection member 30 can be deformed so as to be greatly concavely curved downward, and the front end 30A of the protection member 30 is supported by the radiator support. Compared with the case where it is joined to the lower surface portion of the lower cross 16, it is possible to further suppress the generation of drag between the radiator support lower cross 16 and the suspension member front cross 22B. Furthermore, the joint portion between the protection member 30 and the suspension member front cross 22B can be more reliably broken.

一方、図８には、対比例の車両１００として、ラジエータサポートロアクロス１０２とサスペンションメンバフロントクロス１０４との間に、断面形状が略直線状の保護部材１０６を掛け渡した構造が示されている。この構造では、前面衝突時に衝突荷重が矢印１０８方向に入力されると、保護部材１０６が突っ張るため（保護部材１０６が凹状に変形しにくいため）、ラジエータサポートロアクロス１０２とサスペンションメンバフロントクロス１０４との間で矢印１１０に示すような抗力が発生する。このため、車両下側に荷重が入らず、保護部材１０６とサスペンションメンバフロントクロス１０４との接合部分が破断せず、保護部材１０６が脱落しない。従って、ラジエータサポートロアクロス１０２とサスペンションメンバフロントクロス１０４との間で保護部材１０６が突っ張るため、衝突体５２（図６参照）への荷重入力量が増加する。また、保護部材１０６が突っ張るため、ラジエータサポートロアクロス１０２とサスペンションメンバフロントクロス１０４間の上方部に配置されたフロントサイドメンバの変形を阻害する可能性がある。 On the other hand, FIG. 8 shows a structure in which a protective member 106 having a substantially linear cross section is spanned between a radiator support lower cross 102 and a suspension member front cross 104 as a comparative vehicle 100. . In this structure, when a collision load is input in the direction of the arrow 108 at the time of a frontal collision, the protective member 106 is stretched (because the protective member 106 is not easily deformed into a concave shape), so that the radiator support lower cross 102 and the suspension member front cross 104 A drag as indicated by an arrow 110 occurs between the two. For this reason, no load is applied to the lower side of the vehicle, the joint between the protection member 106 and the suspension member front cross 104 is not broken, and the protection member 106 does not fall off. Accordingly, since the protective member 106 is stretched between the radiator support lower cross 102 and the suspension member front cross 104, the load input amount to the collision body 52 (see FIG. 6) increases. Further, since the protective member 106 is stretched, there is a possibility that the deformation of the front side member disposed in the upper part between the radiator support lower cross 102 and the suspension member front cross 104 may be hindered.

これに対して、本実施形態の車両前部構造では、保護部材３０が脱落することで、衝突体５２への荷重入力量が低減されると共に、フロントサイドメンバ１２を狙い通りに変形させることができる。 On the other hand, in the vehicle front structure of the present embodiment, the protective member 30 falls off, so that the load input amount to the collision body 52 is reduced and the front side member 12 can be deformed as intended. it can.

〔実施形態の補足説明〕
上述した実施形態では、保護部材３０の一端側である前方端部３０Ａがラジエータサポートロアクロス１６に接合され、保護部材３０の中間部３０Ｂ付近がサスペンションメンバフロントクロス２２Ｂに接合されていたが、これに限らず、保護部材３０の他端側である後方端部をサスペンションメンバフロントクロス２２Ｂに接合する構成でもよい。すなわち、保護部材の一端側と保護部材の中間部又は他端側とが一対の支持部材に掛け渡される構造であればよい。 [Supplementary explanation of the embodiment]
In the embodiment described above, the front end 30A, which is one end side of the protection member 30, is joined to the radiator support lower cross 16, and the vicinity of the intermediate portion 30B of the protection member 30 is joined to the suspension member front cross 22B. The configuration is not limited to this, and the rear end, which is the other end of the protection member 30, may be joined to the suspension member front cross 22B. That is, any structure may be used as long as one end side of the protection member and the intermediate portion or the other end side of the protection member are spanned between the pair of support members.

上述した実施形態では、保護部材３０の前方端部３０Ａがラジエータサポートロアクロス１６の上面部１６Ａに接合され、保護部材３０の中間部３０Ｂ付近がサスペンションメンバフロントクロス２２Ｂの下面部２２Ｃに接合されていたが、これに限らず、保護部材３０の前方端部３０Ａがラジエータサポートロアクロス１６の側面部や下面部に接合される構成でもよい。 In the embodiment described above, the front end portion 30A of the protection member 30 is joined to the upper surface portion 16A of the radiator support lower cross 16, and the vicinity of the intermediate portion 30B of the protection member 30 is joined to the lower surface portion 22C of the suspension member front cross 22B. However, the configuration is not limited to this, and the front end portion 30 A of the protection member 30 may be joined to the side surface portion or the lower surface portion of the radiator support lower cross 16.

上述した実施形態では、前方側の支持部材がラジエータサポートロアクロス１６で、後方側の支持部材がサスペンションメンバフロントクロス２２Ｂであったが、この構成に限らず、保護部材３０を他の一対の支持部材に掛け渡してもよい。 In the embodiment described above, the support member on the front side is the radiator support lower cross 16 and the support member on the rear side is the suspension member front cross 22B. However, the present invention is not limited to this configuration, and the protection member 30 is supported by another pair of supports. You may hang over a member.

一実施形態に係る車両前部構造の全体構成を示す側面図である。It is a side view showing the whole vehicle front part structure concerning one embodiment. 一実施形態に係る車両前部構造における保護部材の取付構造を示す断面図である。It is sectional drawing which shows the attachment structure of the protection member in the vehicle front part structure which concerns on one Embodiment. 保護部材の単品構成を示す正面図、平面図及び側面図である。It is the front view, top view, and side view which show the single item structure of a protection member. 保護部材の単品構成を示す斜視図である。It is a perspective view which shows the single item structure of a protection member. 路上干渉物が保護部材に接触したときの状態を示す断面図である。It is sectional drawing which shows a state when a roadside interference object contacts a protection member. 前面衝突時の保護部材の変形状態を示す断面図である。It is sectional drawing which shows the deformation | transformation state of the protection member at the time of front collision. 前面衝突時の保護部材の変形状態を示す断面図である。It is sectional drawing which shows the deformation | transformation state of the protection member at the time of front collision. 対比例に係る車両前部構造における前面衝突時の状態を示す断面図である。It is sectional drawing which shows the state at the time of the front collision in the vehicle front part structure which concerns on contrast.

符号の説明Explanation of symbols

１０車両
１０Ａ前部
１６ラジエータサポートロアクロス（前方側の支持部材）
１６Ａ上面部
２２Ｂサスペンションメンバフロントクロス（後方側の支持部材）
２２Ｃ下面部
３０保護部材
３０Ａ前方端部（一端側）
３０Ｂ中間部
４２、４３、４４車両部品
３８ボルト（保護部材の中間部と後方側の支持部材との接合）
４０ウエルドナット（保護部材の中間部と後方側の支持部材との接合）
５０路上干渉物 DESCRIPTION OF SYMBOLS 10 Vehicle 10A Front part 16 Radiator support lower cross (front side support member)
16A Upper surface portion 22B Suspension member front cross (back support member)
22C lower surface part 30 protection member 30A front end part (one end side)
30B Intermediate part 42, 43, 44 Vehicle parts 38 Bolt (joining of intermediate part of protective member and support member on rear side)
40 Weld nut (joint between the intermediate part of the protective member and the support member on the rear side)
50 Interference on the road

Claims

車両の前部に車両幅方向に沿ってそれぞれ設けられると共に車両前後方向に離間して配置され、車両前後方向の後方側が前方側よりも下方に配置された一対の支持部材と、
車両の前部の下部に前記一対の支持部材の間に掛け渡すように設けられると共に、下方に凹状に湾曲したアーチ形状に形成され、車両の前部の車両部品が路上干渉物と接触するのを防止する保護部材と、
を有することを特徴とする車両前部構造。 A pair of support members provided along the vehicle width direction at the front of the vehicle and spaced apart in the vehicle front-rear direction, the rear side of the vehicle front-rear direction being disposed below the front side;
It is provided in the lower part of the front part of the vehicle so as to span between the pair of support members, and is formed in an arch shape curved in a concave shape downward, so that the vehicle parts in the front part of the vehicle come into contact with roadside interference objects A protective member for preventing
A vehicle front structure characterized by comprising:

前記保護部材の一端側が前記前方側の支持部材の上面部に接合され、
前記保護部材の中間部又は他端側が前記後方側の支持部材の下面部に接合されていることを特徴とする請求項１に記載の車両前部構造。 One end side of the protection member is joined to the upper surface portion of the support member on the front side,
The vehicle front part structure according to claim 1, wherein an intermediate portion or the other end side of the protection member is joined to a lower surface portion of the support member on the rear side.

前記保護部材の中間部又は他端側が、所定値以上の衝突荷重が作用した場合に前記後方側の支持部材に離脱可能に接合されていることを特徴とする請求項１又は請求項２に記載の車両前部構造。 The intermediate portion or the other end side of the protection member is detachably joined to the support member on the rear side when a collision load of a predetermined value or more is applied. Vehicle front structure.