JP2023102446A - bumper reinforcement - Google Patents

Abstract

To provide a structure of a bumper reinforcement which can be stored in a narrow space.SOLUTION: A bumper reinforcement 20 that extends in a vehicle width direction at a front end of a vehicle and receives an impact load in a vehicle longitudinal direction, includes a central part 30 having a quadrangle closed cross sectional shape, and a side end part 40 extending toward the outside in the vehicle width direction from the central part 30, wherein the side end part 40 has a surface outside in the vehicle longitudinal direction that is inclined toward the rear part of the vehicle so that the thickness in the vehicle longitudinal direction becomes thinner toward the outside in the vehicle width direction and to the lower part of the vehicle.SELECTED DRAWING: Figure 3

Description

The present invention relates to a bumper reinforcement structure attached to the front end or rear end of a vehicle.

Bumper reinforcements are attached to the front ends of the pair of left and right side members so as to span the left and right side members and extend in the vehicle width direction. A bumper reinforcement is a strength member that transfers the impact load to the crash box attached to the front end of the side member in the event of a collision. In the event of a collision, the crash box collapses in the longitudinal direction of the vehicle due to the impact load transmitted from the bumper reinforcement and absorbs the impact force.

In many cases, the bumper reinforcement has a shape that curves toward the rear of the vehicle at the outer end in the vehicle width direction in accordance with the front design surface of the vehicle (see, for example, Patent Document 1).

JP 2007-126089 A

By the way, in recent years, there has been a demand to increase the amount of impact force absorption at the time of collision. As a result, the length of the crash box is increased, and a structure that shifts the position of the bumper reinforcement to the front of the vehicle is sometimes used. Further, in recent years, there are cases in which a design design is used in which the lower part or the corners in front of the vehicle are rounded. If a long crash box is used to increase the amount of impact force absorption, the space for accommodating the bumper reinforcement force between the design surface and the front end of the crash box becomes small, and the bumper reinforcement force and the design surface may interfere.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bumper reinforcement structure that can be accommodated in a narrow space.

The bumper reinforcement of the present invention is a bumper reinforcement that extends in the vehicle width direction at the vehicle front end or the vehicle rear end and receives an impact load in the vehicle front-rear direction, and includes a central portion with a square closed cross-sectional shape and side end portions extending outward in the vehicle width direction from the central portion, and the side end portions have surfaces on the vehicle front-rear direction outer side that are inclined rearward or forward in the vehicle front-rear direction so that the thickness in the vehicle front-rear direction decreases toward the vehicle width direction outer side and the vehicle lower side.
characterized by

As a result, the side end portion can be prevented from interfering with the design surface, and the bumper reinforcement can be accommodated in a narrow space.

In the bumper reinforcement of the present invention, a plate member may be attached to the side end portion to cover the outer surface in the vehicle front-rear direction.

As a result, the rigidity of the side ends can be increased, and the impact force can be sufficiently transmitted from the side ends to the crash boxes and the side members.

In the bumper reinforcement of the present invention, the lower side portion of the vehicle front-rear direction outer surface of the central portion may be inclined rearward or forward in the vehicle front-rear direction.

Thereby, even when the lower end portion of the design surface is curved, it is possible to avoid interference between the bumper reinforcement and the design surface. This also facilitates cutting of the side ends.

The present invention allows the bumper reinforcement to be accommodated in tight spaces.

1 is a plan view showing a vehicle front structure provided with a bumper reinforcement according to an embodiment; FIG. FIG. 10 is a diagram showing a cut portion of a longitudinal member having a square closed cross-sectional shape; It is an exploded perspective view of bumper reinforcement of an embodiment. It is a perspective view of the bumper reinforcement of embodiment. FIG. 5 is a cross-sectional view of the central portion of the bumper reinforcement of the embodiment, taken along the line AA shown in FIGS. 1 and 4. FIG. FIG. 5 is a cross-sectional view of the side end portion of the bumper reinforcement of the embodiment, taken along the line BB shown in FIGS. 1 and 4. FIG. FIG. 7 is a cross-sectional view of the side end portion of the bumper reinforcement on the vehicle width direction outer side of FIG.

The bumper reinforcement 20 of the embodiment will be described below. First, a vehicle front structure 100 including a bumper reinforcement 20 according to an embodiment will be described with reference to FIG. An arrow FR, an arrow UP, and an arrow RH shown in each figure indicate the forward direction (advancing direction), upward direction, and rightward direction of the vehicle, respectively. The directions opposite to the arrows FR, UP, and RH indicate the rearward direction, downward direction, and leftward direction of the vehicle. Hereinafter, when simply using the front-rear, left-right, and up-down directions, the front-rear direction of the vehicle, the left-right direction of the vehicle lateral direction (vehicle width direction), and the up-down direction of the vehicle will be used unless otherwise specified.

As shown in FIG. 1, the vehicle front structure 100 includes a pair of left and right side members 11, a crash box 12 attached to the front end of each side member 11, a bumper reinforcement 20 attached to the front end of the crash box 12 and extending in the vehicle width direction to receive an impact load in the vehicle front-rear direction, and a front panel 60 disposed in front of the bumper reinforcement 20 and forming a design surface in front of the vehicle. The crash box 12 is provided with beads 13 whose surfaces are recessed on the upper surface, the lower surface and both side surfaces, and when the impact force in the longitudinal direction of the vehicle is input from the bumper reinforcement 20 at the time of collision, the crash box 12 is deformed so as to be crushed in the longitudinal direction of the vehicle and absorbs the impact force.

As shown in FIG. 1 , the bumper reinforcement 20 includes a main body 21 extending in the vehicle width direction and a plate member 22 . The main body 21 includes a central portion 30 and side end portions 40 extending outward in the vehicle width direction from the central portion 30 .

As shown in FIG. 2, the bumper reinforcement 20 is obtained by cutting both ends of a longitudinal member 70 having a rectangular closed cross-section manufactured by drawing as indicated by the dashed line 81 shown in FIG. The cut portion constitutes the side end portion 40 , and the portion of the longitudinal member 70 which is not cut and remains in the rectangular closed cross-sectional shape constitutes the central portion 30 .

As shown in FIG. 5, the central portion 30 has a square closed cross-sectional shape composed of an upper plate 31, a lower plate 34, a front plate 32, and a rear plate 33, and includes an upper rib 35 and a lower rib 36 that connect the front plate 32 and the rear plate 33 in the longitudinal direction of the vehicle. A lower side portion 37 of the front plate 32 is inclined rearward in the longitudinal direction of the vehicle. As described above, the central portion 30 is a portion of the longitudinal member 70 which is left in the square closed cross-sectional shape without being machined. Therefore, the upper plate 31, the lower plate 34, the outer plate 32, the inner plate 33, the upper central rib 35, the lower central rib 36, and the lower side portion 37 of the longitudinal member 70 shown in FIG. It has the same structure as 77.

As shown in FIGS. 3, 6, and 7, the side end portion 40 is a portion obtained by obliquely cutting the outer plate 72, the upper plate 71, the lower plate 74, the upper rib 75, and the lower rib 76 of the longitudinal member 70 so that the thickness in the vehicle front-rear direction decreases toward the outer side in the vehicle width direction and the lower side of the vehicle, as indicated by the dashed line 81 shown in FIG.

As shown in FIGS. 3 and 6, an inclined portion 47 is formed by cutting the front surface of the front plate 32 so as to incline toward the vehicle rear and vehicle bottom at the boundary portion between the side end portion 40 and the central portion 30. Therefore, a boundary line 47a between the front plate 32 and the inclined portion 47 is inclined so as to open outward in the vehicle width direction as it goes upward. On the other hand, the lower side portion 37 of the central portion 30 is inclined toward the rear of the vehicle, and the angle of inclination of the lower side portion 37 to the rear of the vehicle is the same as the angle of inclination of the inclined portion 47 to the rear of the vehicle. Therefore, the boundary line 47b between the lower side portion 37 of the central portion 30 and the inclined portion 47 extends vertically without being inclined like the upper boundary line 47a. As a result, since the boundary between the lower end of the inclined portion 47 and the lower end of the central portion 30 does not form an acute angle, the cutting of the side end portion 40 is facilitated.

Further, on the vehicle width direction outer side of the inclined portion 47, the front surfaces of the upper plate 71, the lower plate 74, the upper rib 75, and the lower rib 76, which constitute the longitudinal member 70, are machined so as to be inclined toward the vehicle rearward and vehicle downward directions. Also, the inner plate 73 of the longitudinal member 70 constitutes the bottom plate 43 of the side end portion 40 . Accordingly, the upper flange 41, lower flange 44, bottom plate 43, upper rib 45, and lower rib 46 of the side end portion 40 are connected to the upper plate 31, lower plate 34, inner plate 33, upper central rib 35, and lower central rib 36 of the central portion 30, respectively, in the vehicle width direction. In addition, since the outer plate 72 of the longitudinal member 70 is scraped off by cutting, the portion of the side end portion 40 outside the inclined portion 47 in the vehicle width direction has a groove-shaped cross-sectional shape that is open to the front of the vehicle as shown in FIGS.

As shown in FIG. 7, front end surfaces 48, 49, 50, 51 of the upper plate 41, lower plate 44, upper rib 45, and lower rib 46 of the side end portion 40 are inclined toward the rear of the vehicle. The inclined portion 47 of the side end portion 40 and the front end surfaces 48, 49, 50, 51 of the upper plate 41, the lower plate 44, the upper ribs 45, and the lower ribs 46 described above are positioned within a single inclined surface 52 that inclines toward the rear and downward of the vehicle in front of the vehicle. Therefore, the inclined surface 52 constitutes a vehicle front-rear direction outer surface of the side end portion 40 , and is inclined rearward in the vehicle front-rear direction as well as downward with respect to the vehicle.

As shown in FIG. 3 , the plate member 22 is welded onto the inclined surface 52 to cover the vehicle front-rear direction outer surface of the side end portion 40 . The surface of the plate member 22 in front of the vehicle is inclined toward the rear of the vehicle and downward of the vehicle, similarly to the inclined surface 52 . The plate member 22 is provided with a plurality of holes 23 for weight reduction. The inner side of the plate member 22 in the vehicle width direction is inclined to open outward in the vehicle width direction as the upper end face 24a goes upward so as to match the boundary lines 47a and 47b of the inclined portion 47, and the lower end face 24b extends in the vertical direction. Thus, as shown in FIG. 4, when the plate member 22 is mounted on the inclined surface 52 of the side end portion 40, the upper end surface 24a and the lower end surface 24b are aligned with the boundary lines 47a and 47b between the inclined portion 47 and the central portion 30, respectively.

In this way, the bumper reinforcement 20 is machined obliquely so that the front portion of the side end portion 40 becomes thinner toward the rear of the vehicle and downward toward the vehicle front and back. Therefore, as shown in FIGS.

Further, since the plate member 22 is attached to the vehicle front side of the side end portion 40 whose thickness in the longitudinal direction of the vehicle is reduced by cutting, the strength of the side end portion 40 can be secured and the impact force can be sufficiently transmitted to the crash box 12. - 特許庁

Furthermore, since the lower side portion 37 of the front surface of the central portion 30 is inclined toward the rear of the vehicle, the boundary line 47b between the lower side portion 37 and the side end portion 40 extends in the vertical direction, and the boundary between the lower end of the inclined portion 47 and the lower end of the central portion 30 does not form an acute angle shape, thereby facilitating cutting of the side end portion 40.

In the above description, the bumper reinforcement 20 is attached to the front end of the vehicle, but it may be attached to the rear end of the vehicle. In this case, the bumper reinforcement 20 is attached to the rear end of the crash box 12 attached to the rear end of the side member 11 and extends in the vehicle width direction. The inclined surface 52 of the side end portion 40 is inclined toward the front of the vehicle and is inclined obliquely so that the thickness in the vehicle front-rear direction decreases toward the lower side of the vehicle. Therefore, like the bumper reinforcement 20 attached to the front end of the vehicle, the inclined surface 52 of the bumper reinforcement 20 attached to the rear end of the vehicle also forms the outer surface of the side end portion 40 in the front-rear direction of the vehicle, and is inclined forward in the front-rear direction of the vehicle and downward of the vehicle. The plate member 22 is attached to the side end portion 40 so as to cover the vehicle front-rear direction outer surface of the side end portion 40 .

Similar to the bumper reinforcement 20 attached to the front end of the vehicle, the bumper reinforcement 20 attached to the rear end of the vehicle can be arranged between the rear panel and the crash box 12 even if the rear panel (not shown) has curved side and bottom portions and the distance between the rear panel and the tip of the crash box 12 is narrow.

In the above description, the bumper reinforcement 20 is described as cutting both ends of the longitudinal member 70 having a rectangular closed cross-section manufactured by drawing and attaching the plate member 22 to the cut portion. However, the present invention is not limited to this.

11 side member, 12 crash box, 13 bead, 20 bumper reinforcement, 21 main body, 22 plate member, 23 hole, 24a upper end surface, 24b lower end surface, 30 central portion, 31 upper plate, 32 front plate, 33 rear plate, 34, 44 lower plate, 35, 45 upper rib, 36, 46 lower rib, 37 lower side portion, 40 side end portion, 47 inclination Part 47a, 47b Boundary line 48, 49, 50, 51 Front end face 52 Inclined face 60 Front panel 61 Side part 62 Lower part 100 Vehicle front structure.

Claims (3)

A bumper reinforcement that extends in the vehicle width direction at a vehicle front end or a vehicle rear end and receives an impact load in the vehicle front-rear direction,
a center portion of a square closed cross-sectional shape;
a side end portion extending outward in the vehicle width direction from the central portion,
a surface of the side end portion on the vehicle front-rear direction outer side is inclined rearward or forward in the vehicle front-rear direction so that the thickness in the vehicle front-rear direction decreases toward the vehicle width direction outer side and the vehicle lower side;
Bumper Reinforcement characterized by A bumper reinforcement according to claim 1,
a plate member is attached to the side end portion to cover a surface on the outer side in the vehicle front-rear direction;
Bumper Reinforcement characterized by The bumper reinforcement according to claim 1 or 2,
a lower side portion of the outer surface of the center portion in the vehicle front-rear direction is inclined rearwardly or forwardly in the vehicle front-rear direction;
Bumper Reinforcement characterized by

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