JP2012153280A - Bumper for vehicle - Google Patents

Abstract

A vehicular bumper capable of more uniformly absorbing collision energy over a wide range along the vehicle width direction is provided.
A bumper absorber 9 includes a vertical surface 11 extending in the vertical direction and the vehicle width direction, and an upper surface 12 and a lower surface 13 extending from an upper end and a lower end of the vertical surface 11 to a center side in the vehicle front-rear direction. The vehicle width direction end portion 9b is formed to have a longitudinal length that is smaller than the vehicle width direction center portion 9a. An opening 41 serving as an easily deforming means 40 for increasing the amount of deformation in the front-rear direction with respect to the compressive load in the front-rear direction is provided at the vehicle width direction end 9 b of the bumper absorber 9.
[Selection] Figure 5

Description

  The present invention relates to a vehicle bumper.

  Conventionally, a front bumper in which an energy absorber is disposed on the front side of a bumper reinforcement is known. Since the front surface of the energy absorber is formed in an arc shape in plan view, the vehicle width direction central portion of the energy absorber is most compressed and deformed when the vehicle collides with the front, and the vehicle width direction end portion The amount of compressive deformation becomes smaller. Therefore, in the vehicle bumper described in Patent Document 1, in order to uniformize the amount of collision energy absorbed over the entire vehicle width direction, the cross-sectional area of the energy absorber formed in an E-shaped cross section is The value is gradually increased toward the end in the width direction.

JP 2006-341634 A

  However, in the energy absorber described in Patent Document 1, the end in the vehicle width direction is formed to have a smaller length in the vehicle front-rear direction than the center in the vehicle width direction. Therefore, it is easy to generate a crush residue at the end in the vehicle width direction at the time of a frontal collision, and it is difficult to uniformly absorb the collision energy over the entire length in the vehicle width direction.

  Therefore, an object of the present invention is to provide a vehicle bumper that can absorb collision energy more uniformly in a wide range along the vehicle width direction.

  The vehicle bumper according to the present invention is a vehicle bumper that is disposed at the front end or the rear end of the vehicle and extends in the vehicle width direction, specifically, a front bumper or a rear bumper. A bumper fascia disposed at the front end or the rear end of the vehicle and extending in the vehicle width direction, a bumper absorber disposed on the vehicle center side in the vehicle front-rear direction of the bumper fascia and extending in the vehicle width direction; The bumper absorber is disposed on the vehicle center side of the bumper absorber in the vehicle front-rear direction and includes a bumper reinforcement that supports the bumper absorber. The bumper absorber has a U-shaped cross section from a vertical surface extending in the vertical direction and the vehicle width direction, and an upper surface and a lower surface extending from the upper end and the lower end of the vertical surface to the vehicle center side in the vehicle front-rear direction. The length in the front-rear direction of the end portion in the vehicle width direction is smaller than that in the center portion in the vehicle width direction. Easily deforming means is provided at the vehicle width direction end of the bumper absorber. This easily deforming means has an effect of increasing the amount of deformation of the bumper absorber in the front-rear direction when a compressive load in the front-rear direction is input.

  According to the present invention, the easily deforming means is provided at the end in the vehicle width direction of the bumper absorber that is not easily deformed when a collision load is input. Therefore, since the deformation amount at the end portion in the vehicle width direction increases, the energy absorption amount can be made more uniform over a wide range along the vehicle width direction of the bumper absorber.

1 is a perspective view showing a vehicle front end portion according to a first embodiment of the present invention. It is sectional drawing by the AA line of FIG. It is a perspective view which shows the bumper absorber and bumper reinforcement by the 1st Embodiment of this invention. 3A is a cross-sectional view taken along the line BB in FIG. 3, and FIG. 3B is a cross-sectional view taken along the line CC in FIG. FIG. 4 is an exploded perspective view of FIG. 3. It is the top view which looked at FIG. 3 from the top. It is the front view which looked at FIG. 3 from the front. It is an expansion perspective view of the vehicle width direction edge part of the bumper absorber in FIG. (A) is sectional drawing by the DD line of FIG. 8, (b) is sectional drawing which deform | transformed when the collision load which goes to the back from the vehicle front is input. FIG. 10 is a cross-sectional view corresponding to FIG. 9 in a comparative example without an opening, where (a) is a cross-sectional view before a collision load is input, and (b) is a deformed cross section when a collision load is applied from the front to the rear of the vehicle. FIG. It is a perspective view which expands and shows the vehicle width direction edge part of the bumper absorber by 2nd Embodiment. It is a perspective view which expands and shows the vehicle width direction edge part of the bumper absorber by 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the following embodiments, a front bumper is taken as an example, but the present invention is also applicable to a rear bumper disposed at the rear end of the vehicle.

[First embodiment]
First, the first embodiment will be described.

  As shown in FIGS. 1 and 2, a front bumper 2 extending in the vehicle width direction, an upper front grill 3 disposed above the front bumper 2, and a lower side of the front bumper 2 are disposed at the vehicle front end 1. The lower front grill 4 and an under cover 5 extending rearward from the lower end of the lower front grill 4 are provided.

  The upper front grille 3 and the lower front grille 4 are formed with a plurality of vents 6, 7, and vehicle running wind flows into the engine room via the vents 6, 7.

  As shown in FIGS. 2 to 4, the front bumper 2 is disposed so as to face the bumper fascia 8 on the rear side (center side in the vehicle front-rear direction) of the bumper fascia 8 disposed at the front end of the vehicle. The bumper absorber 9 and a bumper reinforcement 10 that supports the bumper absorber 9 are provided on the rear side (center side in the vehicle longitudinal direction) of the bumper absorber 9. The lower front grill 4 is formed on a bumper fascia 8.

  The bumper absorber 9 includes a vertical surface 11 extending in the vertical direction and the vehicle width direction, and an upper surface 12 and a lower surface 13 extending rearward from the upper and lower ends of the vertical surface 11 (center side in the vehicle longitudinal direction). Are formed in a U-shaped cross section.

  The bumper fascia 8 includes a vertical wall surface 14 extending in the vertical direction and the vehicle width direction, a rear wall bent from the upper end of the vertical wall surface 14, and is disposed opposite to the upper surface 12 of the bumper absorber 9. The upper wall surface 15 and the lower wall surface 17 that bends and extends rearward from the lower end of the vertical wall surface 14 and is disposed opposite to the lower surface 13 of the bumper absorber 9.

  As shown in FIGS. 3 and 6, the bumper absorber 9 and the bumper reinforcement 10 are formed in an arcuate shape in a plan view, and the vehicle width direction center portions 9a and 10a have both end portions 9b, It is arranged on the vehicle front side from 10b. Both end portions 9b, 9b in the vehicle width direction of the bumper absorber 9 are formed on flat inclined surfaces 18 whose length in the front-rear direction gradually decreases toward the outside in the vehicle width direction. That is, the inclined surface 18 is gradually inclined backward as it goes outward in the vehicle width direction.

  As shown in FIGS. 4A and 4B, the bumper reinforcement 10 has a vertically long rectangular cross section, and is provided with ribs 19 at upper and lower intermediate height positions. By the ribs 19, the bumper reinforcement 10 is configured in two upper and lower closed cross-sectional structures. Further, as shown in FIG. 4B, a pair of upper and lower grooves 21 and 22 are formed at the upper and lower ends of the front surface 20 of the bumper reinforcement 10 so that the upper surface 12 of the bumper absorber 9 and The rear end of the lower surface 13 is fitted in the grooves 21 and 22. As shown in FIG. 4A, in the vehicle width direction central portion, mounting members 25 and 26 integrally formed on the upper surface 12 and the lower surface 13 of the bumper absorber 9 are provided on the upper wall 29 and the lower surface of the bumper reinforcement 10. Fastened to the wall 30 via bolts 28.

  As shown in FIGS. 3 and 5, four mounting members 23, 25, 26, and 27 are integrally formed on the upper surface 12 and the lower surface 13 along the vehicle width direction on the upper surface 12 of the bumper absorber 9. Has been. These attachment members 23 to 27 are bent in an L-shaped cross section and are fastened to the upper wall 29 and the lower wall 30 of the bumper reinforcement 10 via bolts 28.

  Then, as shown in detail in FIG. 8, when the compressive load in the front-rear direction is input to the inclined surface 18 of the end portion 9 b in the vehicle width direction of the bumper absorber 9, the deformation in the front-rear direction of the bumper absorber 9 is facilitated. An opening 41 is formed as the easily deforming means 40. The opening 41 is formed in a substantially trapezoidal shape in front view in which the vertical height gradually increases from the inner side in the vehicle width direction toward the outer side in the vehicle width direction. That is, the opening 41 is defined by a short side 41a on the inner side in the vehicle width direction, an arc-shaped side 41b on the outer side in the vehicle width direction, and an upper side 41c and a lower side 41d that connect the short side 41a and the arc-shaped side 41b. ing. A flange 44 that is bent in an L shape and extends rearward is integrally formed at the outer end in the vehicle width direction of the bumper absorber 9. Further, a circular mounting surface 45 recessed rearward is formed at the center in the vertical direction inside the vehicle width direction of the flange 44. A through hole 46 is formed in the mounting surface 45, and the bolt 28 is inserted into the through hole 46 and fastened to the front surface 20 of the bumper reinforcement 10.

  Next, with reference to FIGS. 9 and 10, the deformation behavior when a compressive load is applied will be described for the present embodiment and the comparative example.

  In this embodiment, as shown in FIG. 9A, when a load F directed from the front to the rear is input to the vertical surface 11 at the vehicle width direction end portion 9b of the bumper absorber 9 in which the opening 41 is formed. As shown in FIG. 9B, when the moment M is generated, the vertical surface 11 is curved and deformed in an arc shape toward the rear.

  On the other hand, in the comparative example, as shown in FIG. 10A, the bumper absorber 109 in which the opening 41 is not formed has high rigidity, so that even if a load F directed from the front to the rear is input, FIG. As shown in b), the vertical surface 111 hardly deforms.

  Below, the effect by this embodiment is demonstrated.

  The vehicle bumper according to the present embodiment is a front bumper 2 that is disposed at the front end or the rear end of the vehicle and extends in the vehicle width direction. A bumper fascia 8 disposed at the front end of the vehicle, a bumper absorber 9 disposed on the center side (rear side) of the bumper fascia 8 in the vehicle front-rear direction, and a center side (rear side) of the bumper absorber 9 in the vehicle front-rear direction And a bumper reinforcement 10 that supports the bumper absorber 9.

  The bumper absorber 9 is sectioned from a vertical surface 11 extending in the vertical direction and the vehicle width direction, and an upper surface 12 and a lower surface 13 extending from the upper and lower ends of the vertical surface 11 to the center side in the vehicle longitudinal direction. It is formed in a U shape, and the length in the front-rear direction of the vehicle width direction end portion 9b is smaller than the vehicle width direction center portion 9a. Easily deforming means 40 for increasing the amount of deformation in the front-rear direction against the compressive load in the front-rear direction is provided at the vehicle width direction end 9 b of the bumper absorber 9. Specifically, the easily deforming means 40 is an opening 41 formed in the vertical surface 11 of the vehicle width direction end portion 9 b of the bumper absorber 9.

  Therefore, when a load F directed from the front to the rear is input to the vertical surface 11 at the vehicle width direction end portion 9b of the bumper absorber 9, as shown in FIG. Curved and deformed in an arc shape toward the rear. Here, in this embodiment, since the opening part 41 is formed in the vertical surface 11, the deformation amount of the vehicle width direction end part 9b becomes larger than the case where the opening part 41 is not provided. Therefore, energy absorption is also efficiently performed at the vehicle width direction end portion 9b, so that more uniform energy absorption can be performed over a wide range of the bumper absorber 9 in the entire vehicle width direction when a collision load is input.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. However, the same structures as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 11, the bumper absorber 209 according to the present embodiment includes a vehicle width direction center portion 209a and a vehicle width direction end portion 209b. The vehicle width direction end portion 209b is configured only by the flat inclined surface 18 described in the first embodiment. That is, in the first embodiment, the flange 44 indicated by the two-dot chain line in FIG. 11 is provided, but in the present embodiment, this L-shaped flange 44 is not provided. Thus, in the present embodiment, the vehicle width direction end portion 209b formed of the inclined surface 18 without the flange 44 is the easily deformable means 40.

  Therefore, when a collision load is input to the vehicle width direction end portion 209b from the front to the rear, the deformation of the vehicle width direction end portion 209b is not hindered by the flange 44, so that the vehicle width direction end portion 209b is easily deformed. To do. As a result, energy is efficiently absorbed also at the vehicle width direction end portion 209b, so that uniform energy absorption can be performed over the entire vehicle width direction of the bumper absorber 209 when a collision load is input.

[Third embodiment]
Next, a third embodiment of the present invention will be described. However, the same structures as those of the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 12, the bumper absorber 309 according to this embodiment includes a vehicle width direction center portion 309a and a vehicle width direction end portion 209b. The vehicle width direction end portion 309b includes the inclined surface 18 and a flange 44 that bends and extends rearward from the end edge of the inclined surface 18.

  Here, in the first embodiment described above, the through hole 46 is formed in the mounting surface 45, and the bolt 28 is inserted into the through hole 46 and fastened to the front surface 20 of the bumper reinforcement 10. However, in the present embodiment, the vehicle width direction end portion 309b is not supported by the bumper reinforcement 10, and the vehicle width direction center portion 309a is provided via the four attachment members 23, 25, 26, and 27. 10 is fastened and supported. Therefore, the bumper absorber 309 is set such that the support rigidity of the vehicle width direction end portion 309b is lower than the support rigidity of the vehicle width direction center portion 309a. Thus, in the present embodiment, the vehicle width direction end portion 309 b that is not supported by the bumper reinforcement 10 is configured as the easily deformable means 40.

  For this reason, when a collision load is input from the front to the rear in the vehicle width direction end 309b, the vehicle width direction end 309b is easily deformed. As a result, energy is efficiently absorbed also at the vehicle width direction end portion 309b, so that uniform energy absorption can be performed over the entire vehicle width direction of the bumper absorber 309 when a collision load is input.

2 Front bumper (vehicle bumper)
8 Bumper fascia 9, 209, 309 Bumper absorber 10 Bumper reinforcement 11 Vertical surface 12 Upper surface 13 Lower surface 18 Inclined surface 40 Easy deformation means 41 Opening (easy deformation means)

Claims (4)

A vehicle bumper that is disposed at the front end or rear end of the vehicle and extends in the vehicle width direction,
A bumper fascia disposed at the front end or rear end of the vehicle, a bumper absorber disposed on the vehicle center side of the bumper fascia in the vehicle longitudinal direction, and a bumper disposed on the vehicle center side of the bumper absorber in the vehicle longitudinal direction With bumper reinforcement that supports the absorber,
The bumper absorber has a U-shaped cross section from a vertical surface extending in the vertical direction and the vehicle width direction, and an upper surface and a lower surface extending from the upper end and the lower end of the vertical surface to the vehicle center side in the vehicle front-rear direction. Formed, the longitudinal direction length of the end portion in the vehicle width direction is smaller than the central portion in the vehicle width direction,
A vehicular bumper, characterized in that an easily deforming means for increasing the amount of deformation in the front-rear direction by reducing a reaction force against a compressive load in the front-rear direction is provided at an end of the bumper absorber in the vehicle width direction.   The vehicular bumper according to claim 1, wherein the easily deforming means is an opening formed in a vertical surface of an end portion in the vehicle width direction of the bumper absorber.   The vertical surface at the end in the vehicle width direction of the bumper absorber is composed only of a flat inclined surface that extends inward in the front-rear direction toward the outer side in the vehicle width direction. The vehicle bumper according to claim 1, wherein the vehicle bumper is a means.   In the bumper absorber, only the central portion in the vehicle width direction is supported by the bumper reinforcement, and the support rigidity of the end portion in the vehicle width direction in the bumper absorber is lower than that in the central portion in the vehicle width direction. The vehicular bumper according to claim 1, wherein an end portion is the easily deformable means.

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