JP7380450B2 - Vehicle front body structure - Google Patents

Description

The present invention relates to a front body structure of a vehicle.

BACKGROUND ART Conventionally, as a structure for reinforcing a bumper provided at the front portion of a vehicle, a structure has been disclosed in which reinforcing members are provided at both ends of the bumper in the vehicle width direction, as described in Patent Document 1.

With this structure, even if an object (such as an oncoming vehicle or roadside object) partially collides with the end of the bumper in the vehicle width direction from the front of the vehicle (in other words, in the case of a small overlap collision), the reinforcing member It is possible to transmit the collision load to vehicle body components such as a crash box (hereinafter referred to as a crash can in this specification) fixed to the rear of the bumper in the vehicle while suppressing deformation of the bumper.

Japanese Patent Application Publication No. 2019-130972

In recent years, from the viewpoint of improving the rigidity of the bumper, a structure has been proposed in which the entire bumper in the vehicle width direction is reinforced with a reinforcing member. For example, a bumper includes a bumper beam with a U-shaped cross section that extends in the vehicle width direction, a front plate that covers the front of the bumper beam, and a column that extends in the vehicle width direction inside the closed cross section formed by the bumper beam and the front plate. A structure in which a reinforcing member with a letter-shaped cross section is provided is conceivable.

Here, when joining reinforcing members with a U-shaped cross section to a bumper beam with a U-shaped cross section at multiple locations, the springs of the bumper beam and reinforcing members are Due to various manufacturing reasons that cannot be predicted when designing a bag, etc., the lower surfaces may not be able to be connected to each other. In such a state where only two surfaces are joined, the lower surface portion of the reinforcing member still has a free end, is easily deformed out of plane, and does not contribute to reinforcing the lower surface portion of the bumper beam. Therefore, it is not possible to suppress out-of-plane deformation of the lower corner portion formed by the lower surface portion and the rear surface portion of the bumper beam, and it is also impossible to suppress out-of-plane deformation of the rear surface portion of the bumper beam. As a result, it becomes difficult to suppress out-of-plane deformation of the bumper beam during a vehicle collision.

The present invention has been made in view of the above circumstances, and even in a structure where the bumper beam and the reinforcing member are not partially joined, the present invention suppresses out-of-plane deformation of the bumper beam and resists collision loads. The purpose is to provide a front body structure of a vehicle that can endure.

In order to solve the above problems, a front body structure for a vehicle according to the present invention is a front body structure for a vehicle including a bumper extending in the width direction of the vehicle, the bumper extending in the width direction of the vehicle and A bumper beam having a U-shaped cross section that opens forward; a front plate that covers the bumper beam from the front of the vehicle and forms a closed cross section with the bumper beam; and a front plate that extends in the vehicle width direction and is provided inside the closed cross section. and a reinforcing member, and the bumper beam includes a beam upper surface portion extending in the longitudinal direction of the vehicle, a beam rear surface portion extending downward from a rear end of the beam upper surface portion, and a lower end of the beam rear surface portion, when viewed from the side of the vehicle. The reinforcing member includes a beam lower surface portion extending toward the front of the vehicle, and a lower corner portion formed by the beam lower surface portion and the beam rear surface portion. The reinforcing member rear surface portion extends downward from the rear end, and the reinforcing member lower surface portion extends toward the front of the vehicle from the lower end of the reinforcing member rear surface portion, and the reinforcing member upper surface portion is joined to the beam upper surface portion. , the reinforcing member rear surface portion is joined to the beam rear surface portion, the reinforcing member lower surface portion is disposed above the beam lower surface portion without being joined to the beam lower surface portion, and the reinforcing member lower surface portion is , the front end portion of the lower surface portion of the reinforcing member has a flange portion bent downward.

In such a configuration, the bumper beam and the reinforcing member are joined at the upper and lower sides, respectively, but even if the lower part of the reinforcing member is not joined to the lower part of the beam, the lower part of the reinforcing member is connected to its front end. The out-of-plane deformation of the reinforcing member in the event of a vehicle collision is suppressed by being reinforced by the flange part bent downward at the part, thereby creating a pseudo two-plate structure consisting of the lower surface of the beam and the lower surface of the reinforcing member. It is formed. At the same time, out-of-plane deformation of the bumper beam joined to the two surfaces of the reinforcing member upper surface and the reinforcing member rear surface is also suppressed. This suppresses deformation of the lower corner portion formed by the beam lower surface portion and the beam rear surface portion during a vehicle collision, thereby making it possible to suppress out-of-plane deformation of the beam rear surface portion. As a result, even in a structure in which the bumper beam and the reinforcing member are not partially joined, it becomes possible to suppress out-of-plane deformation of the bumper beam and withstand collision loads.

In the above vehicle front body structure, it is preferable that the flange portion is disposed at a height that is the same as or lower than the height of the lower corner portion.

According to this configuration, when the bumper beam is deformed in the longitudinal direction of the vehicle during a frontal collision of the vehicle, the flange portion of the reinforcing member can come into contact with the lower surface portion of the bumper beam, and at this time, the reinforcing member The lower surface part forms a two-plate structure that is restrained by the beam lower surface part and pseudo-joined to the beam lower surface part. This makes it possible to reinforce the lower corner portion of the bumper beam, reliably suppress deformation of the lower corner portion, and reliably suppress out-of-plane deformation of the rear surface portion of the beam. As a result, it becomes possible to reliably suppress bending deformation of the bumper beam during a vehicle collision.

The front body structure of the vehicle described above further includes a pair of crash cans fixed at positions spaced apart from each other in the vehicle width direction at the rear end of the bumper beam, and the bumper beam has, on both sides in the vehicle width direction, A crash can fixing part fixed to the crash can, and an extension part extending outward in the vehicle width direction from the crash can fixing part, and the flange part extends from the end of the reinforcing member in the vehicle width direction to the crash can. It is preferable to extend to a position corresponding to the inner end of the can fixing part in the vehicle width direction or to a position closer to the center in the vehicle width direction than the said position.

The inner end in the vehicle width direction of the crash can fixing part of the bumper beam is far away from the collision load input point, so when a collision load toward the rear of the vehicle is input to the extension part (i.e., in the case of a small overlap collision) ) are most likely to buckle. Therefore, in the above configuration, by reinforcing the inner end of the bumper beam in the vehicle width direction with the flange portion of the reinforcing member, buckling at the inner end of the bumper beam in the vehicle width direction in the event of a small overlap collision can be prevented. is possible.

In the above vehicle front body structure, it is preferable that the angle at which the flange portion is bent downward becomes smaller toward the center of the bumper beam.

According to this configuration, the angle at which the flange portion of the reinforcing member is bent downward becomes smaller as it goes toward the center of the bumper beam, so that the rigidity of the lower surface portion of the reinforcing member reinforced by the flange portion is equal to that of the end portion in the vehicle width direction. The difference in rigidity in the vehicle width direction of the lower surface of the reinforcing member becomes smaller as the stiffness decreases toward the center. As a result, the difference in rigidity in the vehicle width direction of the entire reinforcing member including the lower surface of the reinforcing member and the bumper beam joined on two sides to the reinforcing member is also reduced, so the bumper It is possible to prevent buckling of the beam.

In the above vehicle front body structure, the bumper beam includes an upper joint portion that extends upward from the front end of the beam upper surface portion and joins the front plate, and an upper joint portion that extends downward from the front end of the beam lower surface portion and extends from the front end of the beam upper surface portion and joins the front plate. A lower joint part that joins with the plate, an upper beam flange part formed by bending the upper end of the upper joint part backward in a region where the flange part of the reinforcing member is provided, and the flange part of the reinforcing member are provided. It is preferable to have a lower beam flange portion formed by bending the lower end of the lower joint portion rearward in the region.

According to this configuration, the bumper beam is formed by bending the upper end of the upper beam flange part backward and the lower end of the lower joint part in the area where the flange part of the reinforcing member is provided. It has a lower beam flange. These upper beam flange portions and lower beam flange portions, together with the upper and lower joint portions of the bumper beam, reinforce the front end of the upper beam portion and the front end of the lower beam portion to suppress deformation in the event of a vehicle collision. When the bumper beam is deformed in the longitudinal direction of the vehicle, the flange portion of the reinforcing member can be reliably brought into contact with the lower surface portion of the bumper beam. Thereby, it is possible to reliably suppress deformation of the lower corner portion of the bumper beam.

According to the vehicle front body structure of the present invention, even in a structure where the bumper beam and the reinforcing member are not partially joined, it is possible to suppress out-of-plane deformation of the bumper beam and withstand collision loads. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the overall configuration of a front vehicle body structure of a vehicle according to an embodiment of the present invention, as viewed diagonally from the front and above. FIG. 2 is a plan view of the front vehicle body structure of FIG. 1; FIG. 2 is a perspective view of the front vehicle body structure of FIG. 1 with the front plate of the bumper removed. FIG. 2 is a perspective view of the front vehicle body structure of FIG. 1 viewed obliquely from the rear and above. FIG. 2 is an enlarged perspective view of the front vehicle body structure of FIG. 1 with the front plate of the bumper removed, viewed from the front and above. FIG. 2 is an enlarged perspective view of the bumper beam of the bumper and its surroundings, viewed from the rear and above, of the front vehicle body structure of FIG. 1 . FIG. 7 is a rear view of the bumper beam of FIG. 6; (a) to (g) are cross-sectional views when the bumper beam in FIG. 7 is cut at positions A to G, respectively. FIG. 3 is an enlarged plan view of the bumper beam end and crash can of FIG. 2; 10 is an enlarged plan view of an end portion of the reinforcing member housed in the bumper of FIG. 9. FIG. FIG. 4 is a perspective view of the reinforcing member of FIG. 3; 8(g) is a cross-sectional explanatory diagram showing the process in which the bumper beam of FIG. 8(g) deforms during a vehicle collision, in which (a) the bumper beam is in a state before deformation, and (b) the bumper beam is deformed and the lower surface of the beam is It shows a state in which it is in contact with the flange portion of the reinforcing member. FIG. 2 is an enlarged perspective view of the crush can of FIG. 1;

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 6, the front body structure 1 of the vehicle according to the present embodiment is a collection of parts that receive a collision load in the event of a collision with an object (an oncoming vehicle, an object installed on the road, etc.) from the front of the vehicle. Specifically, the vehicle includes a pair of front frames 2, a pair of crash cans 3, and a bumper 4 that extends in the vehicle width direction Y and includes a bumper beam 5.

Note that the reference numeral 8 shown in FIGS. 1 and 2 indicates a bracket for attaching the shroud of the radiator. This bracket 8 is a component that does not contribute to receiving the collision load, so it may be omitted.

The pair of front frames 2 are arranged apart from each other in the vehicle width direction Y and extend in the vehicle longitudinal direction X. A mounting flange 9 for fixing the crash can 3 is provided at the front end 2a of the front frame 2. Note that the rear end of the front frame 2 is fixed to a vehicle body component such as a hinge pillar (not shown).

Each of the pair of crash cans 3 is fixed to each front end 2a of the pair of front frames 2, and extends in the vehicle longitudinal direction X.

The pair of crash cans 3 are fixed at the rear end of the bumper beam 5 at positions spaced apart from each other in the vehicle width direction Y. That is, the front end 3a of the crash can 3 of this embodiment is fixed to the bumper beam 5 by welding or the like, and the rear end 3b is provided with a mounting flange 10. The crash can 3 is assembled by overlapping the mounting flange 10 on the rear end 3b of the crash can 3 with the mounting flange 9 on the front end 2a of the front frame 2, and connecting the mounting flanges 9 and 10 to each other using fasteners such as bolts. is fixed to the front end 2a of the front frame 2.

Although the shape of the crush can 3 is not particularly limited in the present invention, for example, as shown in FIG. You can leave it there. Furthermore, the front end 3a of the crash can 3 may be formed with a recess 3c into which the bumper beam 5 can fit.

As shown in FIGS. 1 to 10, the bumper 4 includes a bumper beam 5 that is the main body of the bumper 4, a front plate 6 attached to the vehicle front side X1 of the bumper beam 5, and a reinforcing member 7. ing. The bumper beam 5, the front plate 6, and the reinforcing member 7 are manufactured from metal plates such as steel.

The bumper beam 5 extends in the vehicle width direction Y, and is fixed to the front ends 3a of the pair of crash cans 3 by welding or the like.

As shown in FIGS. 3 to 7, the bumper beam 5 is a long member extending in the vehicle width direction Y, and the middle region in the vertical direction Z projects toward the rear of the vehicle X2. As shown in (g), it has a U-shaped cross section that opens toward the front of the vehicle X1.

More specifically, as shown in FIGS. 7 and 8(a) to 8(g), the bumper beam 5 has a beam upper surface portion 5a extending in the vehicle longitudinal direction X when viewed from the side of the vehicle. , a beam rear surface section 5b extending downward from the rear end of the beam upper surface section 5a, a beam lower surface section 5c extending from the lower end of the beam rear surface section 5b toward the vehicle front X1, and the beam upper surface section 5a and the beam rear surface section 5b. It includes an upper corner portion 5d and a lower corner portion 5e formed by the beam lower surface portion 5c and the beam rear surface portion 5b.

Further, as shown in FIGS. 7 and 8(a) to 8(g), the bumper beam 5 has an upper joint portion 5f extending upward from the front end of the beam upper surface portion 5a and joining to the front plate 6, and an upper joint portion 5f on the beam lower surface. It has a lower joint part 5g that extends downward from the front end of the part 5c and joins to the front plate 6. The bumper beam 5 having a hat cross section is constituted by the beam upper surface portion 5a, the beam rear surface portion 5b, the beam lower surface portion 5c, the upper joint portion 5f, and the lower joint portion 5g.

Further, as shown in FIGS. 6 to 7 and FIGS. 8(a) to 8(b), in the bumper beam 5 of this embodiment, at least one of the beam upper surface portion 5a and the beam lower surface portion 5c (in this embodiment, (both) are bent in the vertical direction (in other words, bent in a step shape) and have step portions 5j and 5k extending in the vehicle width direction Y between the vehicle width direction inner end portions 13 on both sides in the vehicle width direction Y. ing. Specifically, the beam upper surface portion 5a is formed with a step portion 5j that is bent downward to reinforce the upper surface portion 5a. A step portion 5k that is bent upward is formed on the beam lower surface portion 5c to reinforce the beam lower surface portion 5c.

In addition, as shown in FIGS. 2 to 4, 6 to 7, and 9, the bumper beam 5 has a crash can fixing portion 11 fixed to the crash can 3 on both sides in the vehicle width direction Y, and a crash can fixing portion 11 fixed to the crash can 3. The extension portion 12 extends further outward than the portion 11 in the vehicle width direction Y.

As shown in FIGS. 1 to 2 and 8 to 9, the front plate 6 is a plate-like member extending in the vehicle width direction Y, and covers the bumper beam 5 having a U-shaped cross section from the front side of the vehicle X1. Together, they form a closed cross section.

The reinforcing member 7 is a member that reinforces the bumper beam 5, and extends in the vehicle width direction Y and is provided inside a closed section 15 (see FIG. 8(a)) formed by the bumper beam 5 and the front plate 6.

Similarly to the bumper beam 5, the reinforcing member 7 is also formed in a shape extending in the vehicle width direction and having a U-shaped cross section.

Specifically, as shown in FIGS. 8(a) to 8(g), the reinforcing member 7 includes a reinforcing member upper surface portion 7a, and a reinforcing member rear surface portion 7b extending downward from the rear end of the reinforcing member upper surface portion 7a. , and a reinforcing member lower surface portion 7c extending from the lower end of the reinforcing member rear surface portion 7b toward the vehicle front X1.

The reinforcing member upper surface portion 7a is joined to the beam upper surface portion 5a at a joint portion 21 by spot welding or the like. The reinforcing member rear surface portion 7b is joined to the beam rear surface portion 5b at a joint portion 22 by spot welding or the like. On the other hand, the reinforcing member lower surface portion 7c is disposed above the beam lower surface portion 5c without being joined to the beam lower surface portion 5c.

As a main feature of the vehicle front body structure 1 of this embodiment, as shown in FIGS. 8(b) to 8(g) and FIG. 11, the reinforcing member lower surface portion 7c is has a flange portion 7d bent downward.

As shown in FIGS. 8(b) to 8(g), the flange portion 7d is arranged at a height equal to or lower than the height of the lower corner portion 5e.

The flange portion 7d is located at a position corresponding to or from the Y end of the reinforcing member 7 in the vehicle width direction to the inner end 13 of the crash can fixing portion 11 in the vehicle width direction (see FIGS. 4, 6, 7, and 9). It extends to a position closer to the center in the vehicle width direction Y than the front end. Specifically, the flange portion 7d shown in FIG. 11 extends in the area FA (see FIG. 7) from position B to the end in the vehicle width direction on both sides of the bumper beam 5 in the vehicle width direction shown in FIG. .

Further, as shown in FIGS. 8(b) to 8(g), the angle at which the flange portion 7d is bent downward becomes smaller as it goes toward the center of the bumper beam 5, and the angle at which the flange portion 7d is bent downward becomes smaller as it approaches the center of the bumper beam 5. The difference in rigidity in the width direction Y is reduced.

Furthermore, the bumper beam 5 of this embodiment has a portion of the bumper beam 5 on the vehicle front X1 side (that is, the upper joint portion 5f, the lower joint portion 5g, the front end of the beam upper surface portion 5a, and the front end of the beam lower surface portion 5c). For reinforcement, as shown in FIGS. 7 and 8(a) to 8(g), the upper end of the upper joint portion 5f is moved rearward in the area FA (see FIG. 7) where the flange portion 7d of the reinforcing member 7 is provided. It further includes an upper beam flange portion 5h formed by bending, and a lower beam flange portion 5i formed by bending the lower end of the lower joint portion 5g backward in the area FA where the flange portion 7d of the reinforcing member 7 is provided. In this embodiment, as shown in FIG. 7, the upper beam flange portion 5h and the lower beam flange portion 5i are provided over almost the entire length of the bumper beam 5, but the present invention is not limited to this. , it suffices if it is provided at least in the area FA where the flange portion 7d of the reinforcing member 7 is provided. In addition, in FIG. 7, in the region of the crash can fixing part 11 of the bumper beam 5, there is a part where the upper beam flange part 5h and the lower beam flange part 5i are not provided in order to avoid interference with the crash can 3. , it is possible to provide the upper beam flange portion 5h and the lower beam flange portion 5i over the entire region of the crush can fixing portion 11, as long as the interference can be avoided by changing the dimensions of the crush can 3, etc.

(Features of this embodiment)
(1)
As shown in FIGS. 1 to 10, a front body structure 1 of a vehicle according to the present embodiment is a front body structure 1 of a vehicle equipped with a bumper 4 extending in the vehicle width direction Y. A bumper beam 5 that extends in the width direction Y and has a U-shaped cross section that opens toward the front of the vehicle X1, a front plate 6 that covers the bumper beam 5 from the front of the vehicle X1 and forms a closed cross section with the bumper beam 5, and The reinforcing member 7 extends in the Y direction and is provided inside the closed cross section.

As shown in FIGS. 8(a) to 8(g), the bumper beam 5 includes a beam upper surface portion 5a extending in the front-rear direction and a beam rear surface portion 5b extending downward from the rear end of the beam upper surface portion 5a when viewed from the side of the vehicle. , a beam lower surface portion 5c extending from the lower end of the beam rear surface portion 5b toward the vehicle front X1, and a lower corner portion 5e formed by the beam lower surface portion 5c and the beam rear surface portion 5b. The reinforcing member 7 includes a reinforcing member upper surface portion 7a, a reinforcing member rear surface portion 7b extending downward from the rear end of the reinforcing member upper surface portion 7a, and a reinforcing member lower surface portion 7c extending from the lower end of the reinforcing member rear surface portion 7b toward the vehicle front X1. , is equipped with. The reinforcing member upper surface portion 7a is joined to the beam upper surface portion 5a. The reinforcing member rear surface portion 7b is joined to the beam rear surface portion 5b. The reinforcing member lower surface portion 7c is disposed above the beam lower surface portion 5c without being joined to the beam lower surface portion 5c.

As shown in FIGS. 8(b) to (g) and FIG. 11, the reinforcing member lower surface portion 7c has a flange portion 7d in which the front end portion of the reinforcing member lower surface portion 7c is bent downward.

In the configuration of the front vehicle body structure 1 described above, the bumper beam 5 and the reinforcing member 7 are joined at the upper and lower sides, respectively, while the lower part 7c of the reinforcing member is not joined to the lower part 5c of the beam. Even if there is, as shown in FIGS. 12(a) and 12(b), the lower surface portion 7c of the reinforcing member is reinforced with the flange portion 7d bent downward at the front end thereof, so that the reinforcing member 7 is protected during a vehicle collision. Out-of-plane deformation of the beam is suppressed, thereby forming a pseudo two-plate structure consisting of the beam lower surface portion 5c and the reinforcing member lower surface portion 7c. At the same time, out-of-plane deformation of the bumper beam 5 joined to the two surfaces of the reinforcing member upper surface portion 7a and the reinforcing member rear surface portion 7b is also suppressed.

This suppresses deformation of the lower corner portion 5e formed by the beam lower surface portion 5c and the beam rear surface portion 5b at the time of a vehicle collision, thereby making it possible to suppress out-of-plane deformation of the beam rear surface portion 5b. . As a result, even in a structure in which the bumper beam 5 and the reinforcing member 7 are not partially joined, it becomes possible to suppress out-of-plane deformation of the bumper beam 5 and withstand the collision load.

(2)
Further, in this embodiment, as shown in FIGS. 8(a) to 8(g), on the upper surface side of the bumper beam 5, the beam upper surface portion 5a is joined to the reinforcing member upper surface portion 7a, and the beam rear surface portion 5b is joined to the reinforcing member upper surface portion 7a. Since it is joined to the reinforcing member rear surface portion 7b, deformation of the upper corner portion 5d formed by the beam upper surface portion 5a and the beam rear surface portion 5b is suppressed in the event of a vehicle collision. Therefore, as described in (1) above, not only the deformation of the lower corner 5e of the bumper beam 5 is suppressed, but also the deformation of the upper corner 5d is suppressed, so that the rear surface portion 5b of the beam is Since the beam is constrained in both directions, it is possible to effectively suppress out-of-plane deformation of the rear beam portion 5b.

(3)
In the vehicle front body structure 1 of this embodiment, as shown in FIGS. 8(b) to 8(g), the flange portion 7d is arranged at a height that is the same as or lower than the height of the lower corner portion 5e. ing.

According to this configuration, as shown in FIGS. 12(a) and 12(b), when the bumper beam 5 is deformed in the vehicle longitudinal direction At this time, the reinforcing member lower surface 7c is restrained by the beam lower surface 5c and forms a two-plate structure that is pseudo-joined to the beam lower surface 5c. do. This makes it possible to reinforce the lower corner portion 5e of the bumper beam 5, reliably suppress deformation of the lower corner portion 5e, and reliably suppress out-of-plane deformation of the beam rear surface portion 5b. As a result, it becomes possible to reliably suppress bending deformation of the bumper beam 5 during a vehicle collision.

(4)
As shown in FIGS. 1 to 6, the vehicle front body structure 1 of this embodiment further includes a pair of crash cans 3 fixed at positions spaced apart from each other in the vehicle width direction Y at the rear end of the bumper beam 5. We are prepared. The bumper beam 5 includes a crash can fixing part 11 fixed to the crash can 3 on both sides in the vehicle width direction Y, and an extension part 12 extending outward in the vehicle width direction Y from the crash can fixing part 11. .

The flange portion 7d is located at a position corresponding to or from the Y end of the reinforcing member 7 in the vehicle width direction to the inner end 13 of the crash can fixing portion 11 in the vehicle width direction (see FIGS. 4, 6, 7, and 9). It extends to a position closer to the center in the vehicle width direction Y (specifically, it extends to the range of area FA shown in FIG. 7).

When verifying the deformation of each component during a collision in the front body structure 1 of this embodiment, the inner end 13 in the vehicle width direction of the crash can fixing part 11 of the bumper beam 5 is far from the collision load input point. Therefore, buckling is most likely to occur when a collision load directed toward the rear of the vehicle is input to the extension portion 12 (that is, during a small overlap collision). Therefore, in the above configuration, by reinforcing the inner end 13 of the bumper beam 5 in the vehicle width direction with the flange portion 7d of the reinforcing member 7, the inner end 13 of the bumper beam 5 in the vehicle width direction is It is possible to prevent buckling.

(5)
In the vehicle front body structure 1 of this embodiment, as shown in FIGS. 8(b) to 8(g), the angle at which the flange portion 7d is bent downward becomes smaller toward the center of the bumper beam 5.

According to this configuration, the angle at which the flange portion 7d of the reinforcing member 7 is bent downward becomes continuously smaller toward the center of the bumper beam 5, so that the rigidity of the lower surface portion 7c of the reinforcing member reinforced by the flange portion 7d is The difference in rigidity of the reinforcing member lower surface portion 7c in the vehicle width direction Y decreases as it goes from the end to the center in the vehicle width direction (more preferably, it decreases continuously). As a result, the difference in rigidity in the vehicle width direction Y of the entire reinforcing member 7 including the reinforcing member lower surface portion 7c and the bumper beam 5 joined to the reinforcing member 7 on two sides becomes smaller, so that in the event of a vehicle collision (especially when small overlap It is possible to prevent buckling of the bumper beam 5 during a collision).

(6)
In the vehicle front body structure 1 of this embodiment, as shown in FIGS. 7 and 8(a) to 8(g), the bumper beam 5 extends upward from the front end of the beam upper surface portion 5a, and the front plate 6 an upper joint part 5f that joins with the lower joint part 5f, a lower joint part 5g that extends downward from the front end of the beam lower surface part 5c and joins with the front plate 6, and an upper end of the upper joint part 5f in the area where the flange part 7d of the reinforcing member 7 is provided. It has an upper beam flange portion 5h formed by bending the lower end of the lower joint portion 5g backward in a region where the flange portion 7d of the reinforcing member 7 is provided.

According to this configuration, the bumper beam 5 has an upper beam flange portion 5h formed by bending the upper end of the upper joint portion 5f rearward and a lower end of the lower joint portion 5g in the region where the flange portion 7d of the reinforcing member 7 is provided. It has a lower beam flange portion 5i that is bent rearward. As shown in FIGS. 12(a) and 12(b), these upper beam flange portion 5h and lower beam flange portion 5i, together with the upper joint portion 5f and lower joint portion 5g of the bumper beam 5, are connected to the front end of the beam upper surface portion 5a and Since the front end of the beam lower surface portion 5c is reinforced to suppress deformation during a vehicle collision, when the bumper beam 5 is deformed in the vehicle longitudinal direction It is possible to reliably abut the portion 5c. Thereby, it is possible to reliably suppress deformation of the lower corner portion 5e of the bumper beam 5.

1 Front body structure 2 Front frame 3 Crash can 4 Bumper 5 Bumper beam 5a Beam upper surface portion 5b Beam rear surface portion 5c Beam lower surface portion 5d Upper corner portion 5e Lower corner portion 5f Upper joint portion 5g Lower joint portion 5h Upper beam flange portion 5i Lower beam flange portion 7 Reinforcement member 7a Reinforcement member upper surface portion 7b Reinforcement member rear surface portion 7c Reinforcement member lower surface portion 7d Flange portion 11 Crash can fixing portion 12 Extension portion 13 Vehicle width direction inner end portion 21 Joint portion 22 Joint portion

Claims (5)

A front body structure of a vehicle including a bumper extending in the vehicle width direction,
The bumper is
a bumper beam that extends in the vehicle width direction and has a U-shaped cross section that opens toward the front of the vehicle;
a front plate that covers the bumper beam from the front of the vehicle and forms a closed cross section with the bumper beam;
and a reinforcing member extending in the vehicle width direction and provided inside the closed cross section,
When viewed from the side of the vehicle, the bumper beam includes a beam upper surface portion extending in the longitudinal direction of the vehicle, a beam rear surface portion extending downward from the rear end of the beam upper surface portion, and a beam lower surface portion extending toward the front of the vehicle from the lower end of the beam rear surface portion. and a lower corner portion formed by the beam lower surface portion and the beam rear surface portion,
The reinforcing member includes a reinforcing member upper surface portion, a reinforcing member rear surface portion extending downward from a rear end of the reinforcing member upper surface portion, and a reinforcing member lower surface portion extending toward the front of the vehicle from a lower end of the reinforcing member rear surface portion. Ori,
The reinforcing member upper surface portion is joined to the beam upper surface portion,
the reinforcing member rear surface portion is joined to the beam rear surface portion;
The reinforcing member lower surface portion is disposed above the beam lower surface portion without being joined to the beam lower surface portion,
The lower surface portion of the reinforcing member has a flange portion in which a front end portion of the lower surface portion of the reinforcing member is bent downward.
A front body structure of a vehicle characterized by: The flange portion is arranged at a height that is the same as or lower than the height of the lower corner portion,
The front body structure of a vehicle according to claim 1. further comprising a pair of crash cans fixed at positions spaced apart from each other in the vehicle width direction at the rear end of the bumper beam,
The bumper beam includes, on both sides in the vehicle width direction, a crash can fixing part fixed to the crash can, and an extension part extending outward in the vehicle width direction from the crash can fixing part,
The flange portion extends from an end in the vehicle width direction of the reinforcing member to a position corresponding to an inner end in the vehicle width direction of the crash can fixing portion or a position closer to the center in the vehicle width direction than the said position.
The front body structure of a vehicle according to claim 1 or 2. The angle at which the flange portion is bent downward becomes smaller toward the center of the bumper beam.
The front body structure of a vehicle according to any one of claims 1 to 3. The bumper beam is
an upper joint portion extending upward from the front end of the beam upper surface portion and joining the front plate;
a lower joint portion extending downward from the front end of the beam lower surface portion and joining the front plate;
an upper beam flange portion formed by bending the upper end of the upper joint portion rearward in a region where the flange portion of the reinforcing member is provided;
a lower beam flange portion formed by bending a lower end of the lower joint portion rearward in a region where the flange portion of the reinforcing member is provided;
has,
The front body structure of a vehicle according to claim 2.

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