JP2008189250A - Bumper structure - Google Patents

Abstract

An upright portion is broken from an energy absorbing portion when a vehicle collides.
In a bumper structure, a notch is formed in a vehicle front side portion of a vehicle lower end of an upright portion of an absorber. For this reason, when a load acts on the bumper cover 14 from the upper side of the vehicle, a load in the compression direction acts on the notch 28 portion of the standing portion 26, so that the energy absorbing portion 22 by the notch 28 of the standing portion 26 Is prevented, and the surface rigidity holding portion 30 can hold the shape of the bumper cover 14. On the other hand, at the time of a frontal collision of the vehicle, a load in the tensile direction acts on the notch 28 portion of the standing portion 26, whereby the standing portion 26 can be broken from the energy absorbing portion 22 by the notch 28, and the standing portion 26 absorbs energy. It is possible to prevent the compression deformation of the portion 22.
[Selection] Figure 1

Description

  The present invention relates to a bumper structure in which an absorber is disposed between a bumper cover and a bumper reinforcement.

  As a bumper structure, there is a structure in which a main body portion that absorbs an impact is provided on a vehicle lower side portion of an absorber, and a shape holding portion that holds a shape of a bumper cover is provided on an upper vehicle portion of the absorber (for example, , See Patent Document 1).

Here, in such a bumper structure, it is desirable that the shape holding portion breaks from the main portion when the vehicle collides.
Japanese Utility Model Publication No. 1-120457

  An object of the present invention is to obtain a bumper structure in which the standing portion can be broken from the energy absorbing portion in the event of a vehicle collision in consideration of the above facts.

  The bumper structure according to claim 1 includes a bumper cover provided on an outer surface of a bumper of a vehicle, a bumper reinforcement that reinforces the bumper, and an absorber disposed between the bumper cover and the bumper reinforcement. An energy absorber disposed on the outer side of the bumper reinforcement and capable of absorbing collision energy; and provided on the absorber and erected on the upper side of the vehicle from the energy absorber. A standing portion, a shape holding portion provided in an upper portion of the vehicle of the standing portion and capable of holding the shape of the bumper cover, and provided in the standing portion of a vehicle outer portion of the standing portion. Rigidity reduction means for reducing the rigidity as compared with the rigidity of the vehicle inner side portion of the upright portion.

  The bumper structure according to a second aspect is the bumper structure according to the first aspect, wherein the standing portion is erected on the vehicle upper side from a vehicle inner side portion of the energy absorbing portion, and the vehicle outer side of the erected portion. The portion is provided with the rigidity reducing means.

  The bumper structure according to a third aspect is the bumper structure according to the first or second aspect, wherein the rigidity reducing means is notched and is above the vehicle front side of the bumper reinforcement. It is arranged in that.

  A bumper structure according to a fourth aspect of the present invention is the bumper structure according to any one of the first to third aspects, wherein the vehicle lower side portion of the standing portion abuts against the vehicle upper side surface of the bumper reinforcement. It is characterized by that.

  In the bumper structure according to claim 1, the bumper cover is provided on the outer surface of the bumper of the vehicle, the bumper reinforcement reinforces the bumper, and the absorber is disposed between the bumper cover and the bumper reinforcement. .

  Moreover, the energy absorption part provided in the absorber is arrange | positioned on the vehicle outer side of bumper reinforcement, and it is made possible to absorb collision energy. Further, the standing part provided on the absorber is erected on the vehicle upper side from the energy absorbing part, and the shape holding part provided on the vehicle upper part of the standing part can hold the shape of the bumper cover. ing.

  Here, the rigidity reducing means provided in the standing portion reduces the rigidity of the vehicle outer portion of the standing portion as compared with the rigidity of the vehicle inner portion of the standing portion.

  For this reason, when the shape retaining portion of the standing portion receives a load acting on the bumper cover from the upper side of the vehicle, a load in the compression direction acts on the rigidity reducing means of the standing portion, thereby reducing the rigidity of the standing portion. The breakage from the energy absorbing portion by the means is suppressed, and the shape holding portion can hold the shape of the bumper cover.

  On the other hand, when the erected part receives a load acting on the bumper cover from the outside of the vehicle when the vehicle collides with the collision partner, a load in the tensile direction acts on the rigidity reducing means of the erected part. However, it can be broken from the energy absorbing portion by the rigidity reducing means, and the collision partner can be appropriately protected.

  In the bumper structure according to the second aspect, the standing portion is erected on the vehicle upper side from the vehicle inner portion of the energy absorbing portion, and the rigidity reducing means is provided on the vehicle outer portion of the standing portion. For this reason, the rigidity reducing means can reduce the rigidity of the vehicle outer portion of the upright portion as compared with the rigidity of the vehicle inner portion of the upright portion with a simple structure.

  In the bumper structure according to claim 3, the rigidity reducing means is cut out. For this reason, a rigidity reduction means can be comprised in a standing part with a simple structure. Furthermore, the rigidity reducing means is arranged on the vehicle upper side with respect to the vehicle front side surface of the bumper reinforcement. For this reason, when the vehicle collides with the collision partner, it is possible to prevent the front side surface of the bumper reinforcement from inhibiting the breakage from the energy absorbing portion by the rigidity reducing means of the standing portion.

  In the bumper structure according to the fourth aspect, the vehicle lower side portion of the standing portion is in contact with the vehicle upper side surface of the bumper reinforcement. For this reason, when the shape holding part of the standing part receives the load acting on the bumper cover from the upper side of the vehicle, the upper side surface of the bumper reinforcement can receive the load. Can be effectively suppressed, and the shape holding portion can effectively hold the shape of the bumper cover.

[First Embodiment]
FIG. 1 shows a bumper structure 10 according to a first embodiment of the present invention in a sectional view as seen from the left side of a vehicle. In the drawings, the front side of the vehicle (outside the vehicle) is indicated by an arrow FR, and the upper side of the vehicle is indicated by an arrow UP.

  The bumper structure 10 according to the present embodiment is applied to a front bumper 12 as a vehicle bumper, and the front bumper 12 is provided at a front end of the vehicle.

  A bumper cover 14 (bumper fascia) having a U-shaped cross section is provided on the outer surface of the front bumper 12, and the bumper cover 14 extends in the vehicle width direction, and the interior is the rear side of the vehicle (inside the vehicle). Are open to

  Inside the bumper cover 14, a long rectangular tubular bumper reinforcement 16 is provided in the vehicle lower portion and the vehicle rear portion, and the bumper reinforcement 16 extends in the vehicle width direction. The front bumper 12 is reinforced. A predetermined number (two in the present embodiment) of plate-like reinforcing plates 18 are provided inside the bumper reinforcement 16, and the reinforcing plates 18 are provided on the vehicle front side wall and the vehicle rear side wall of the bumper reinforcement 16. The bumper reinforcement 16 is reinforced between the two.

  Inside the bumper cover 14, a columnar absorber 20 as an energy absorbing member is provided on the front side of the bumper reinforcement 16. The absorber 20 is made of a foam material and has a compressive strength that is higher than the tensile strength. It has been enlarged.

  An energy absorbing portion 22 having a U-shaped cross section is provided in the vehicle lower portion of the absorber 20, and the vehicle upper side portion and the vehicle rear end of the vehicle lower portion of the energy absorbing portion 22 are the vehicles of the bumper reinforcement 16. Fixed to the front side. Here, when the vehicle collides frontally with a collision partner 24 (for example, a pedestrian's leg), the bumper cover 14 is deformed or broken, and the energy absorbing portion 22 is compressed and deformed to the rear side of the vehicle. The collision load (collision energy) is absorbed.

  An upright portion 26 having an L-shaped cross section is provided at the vehicle upper portion of the absorber 20, and the standing portion 26 is erected on the vehicle upper side from the vehicle rear side end of the vehicle upper side surface of the energy absorbing portion 22. And protrudes to the front side of the vehicle. Thereby, the standing part 26 is arrange | positioned at the vehicle upper side of the vehicle front side surface and the vehicle upper side surface of the bumper reinforcement 16, and the bumper reinforcement 16 is not arranged on the vehicle rear side of the standing part 26. .

  A semi-cylindrical notch 28 (fragile portion) as a rigidity reducing means is formed at the vehicle lower side end (between the energy absorbing portion 22 and the standing portion 26) of the standing portion 26 at the vehicle front side portion. The notch 28 is open to the front side of the vehicle. As a result, the rigidity of the vehicle front side portion at the vehicle lower end of the standing portion 26 is reduced as compared with the rigidity of the vehicle rear portion of the vehicle lower end of the standing portion 26. Further, the notch 28 is disposed on the vehicle front side of the bumper reinforcement 16 and on the vehicle upper side of the vehicle upper side surface.

  A surface rigidity holding portion 30 as a shape holding portion is provided in the entire vehicle longitudinal direction at the vehicle upper end of the standing portion 26, and a vehicle front side portion of the surface rigidity holding portion 30 is located on the vehicle front side from the standing portion 26. Has been stretched. Further, the vehicle upper side surface of the surface rigidity holding portion 30 is disposed in the vicinity of the vehicle upper side wall of the bumper cover 14, and the vehicle front side surface of the surface rigidity holding portion 30 is disposed in the vicinity of the vehicle front side wall of the bumper cover 14. Yes.

  Next, the operation of the present embodiment will be described.

  In the bumper structure 10 having the above-described configuration, a load is applied to the vehicle upper side wall of the bumper cover 14 from the upper side of the vehicle when a person touches the vehicle upper side surface of the bumper cover 14 so that the vehicle upper side wall of the bumper cover 14 is below the vehicle. When the surface rigidity holding portion 30 receives the load F1 acting on the surface rigidity holding portion 30 of the absorber 20 from the upper side of the vehicle when being deformed to the side, the deformation amount of the upper side wall of the bumper cover 14 is reduced. The vehicle upper side wall of the bumper cover 14 is temporarily deformed, and the shape (surface rigidity) of the vehicle upper side wall of the bumper cover 14 is maintained.

  Further, when the vehicle collides frontally with the collision partner 24, the bumper cover 14 is deformed or broken, and the energy absorbing portion 22 of the absorber 20 is compressed and deformed toward the rear side of the vehicle, thereby absorbing the collision load. The load F2 acts on the surface rigidity holding portion 30 of the absorber 20 from the front side of the vehicle.

  Here, in the absorber 20, the notch 28 is formed in the vehicle front side portion of the vehicle lower side end of the standing portion 26, so that the rigidity of the vehicle front side portion of the vehicle lower end of the standing portion 26 is increased. This is lower than the rigidity of the vehicle rear side portion of the vehicle lower end. Further, the absorber 20 (foaming material) has a compressive strength larger than the tensile strength.

  Thus, as described above, when a load acts on the upper side wall of the bumper cover 14 from the upper side of the vehicle and a load F1 acts on the surface rigidity holding portion 30 from the upper side of the vehicle, as shown in FIG. A moment M1 (= F1 × L1) to the vehicle front side with respect to the energy absorbing portion 22 acts on the installation portion 26. Therefore, a load in the tensile direction acts on the vehicle rear side portion of the vehicle lower end of the standing portion 26, while a load in the compression direction acts on the vehicle front portion (notch 28 portion) of the vehicle lower end of the standing portion 26. As a result, as shown by a broken line in FIG. 3, breakage from the energy absorbing portion 22 due to the notch 28 of the standing portion 26 is prevented, and the surface rigidity holding portion 30 holds the shape of the bumper cover 14. it can.

  When the energy absorbing portion 22 is compressed and deformed to the rear side of the vehicle and the load F2 is applied to the surface rigidity holding portion 30 from the front side of the vehicle as described above, as shown in FIG. The moment M2 (= F2 × L2) to the rear side of the vehicle with respect to the energy absorbing portion 22 acts on the standing portion 26. For this reason, a load in the compression direction acts on the vehicle rear side portion of the vehicle lower end of the standing portion 26, while a load in the tensile direction acts on the vehicle front portion (notch 28 portion) of the vehicle lower end of the standing portion 26. By acting, as shown by a solid line in FIG. 3, the standing portion 26 can be relatively easily broken (detached) from the energy absorbing portion 22 by the notch 28. In addition, since the notch 28 is disposed on the vehicle front side of the bumper reinforcement 16 and the vehicle upper side of the bumper reinforcement 16, the breakage from the energy absorbing portion 22 due to the notch 28 of the standing portion 26 is prevented in front of the bumper reinforcement 16 in front of the vehicle. The side surface can be prevented from being obstructed, and the standing portion 26 broken from the energy absorbing portion 22 can move to the vehicle rear side via the vehicle upper side of the bumper reinforcement 16. As a result, the standing portion 26 can be prevented from obstructing the compressive deformation of the energy absorbing portion 22, the absorption of the collision load by the energy absorbing portion 22 can be stabilized, and the collision partner 24 can be appropriately set as intended. Can be protected.

  Therefore, when the absorber 20 is provided with the energy absorbing portion 22 and the standing portion 26 as in the present embodiment, and when the absorber 20 is provided with only the energy absorbing portion 22 as shown in FIG. 4, the standing portion 26 is provided. The relationship between the displacement (deformation stroke) of the absorber 20 and the absorption load of the absorber 20 at the time of a frontal collision of the vehicle can be made substantially the same.

  Further, the vehicle front side portion of the surface rigidity holding portion 30 extends from the standing portion 26 to the vehicle front side. For this reason, when the standing portion 26 is broken from the energy absorbing portion 22 and moves to the rear side of the vehicle at the time of a frontal collision of the vehicle, the front side portion of the surface rigidity holding portion 30 contacts the vehicle upper side wall of the bumper cover 14 and the like. Even if they come into contact with each other, the vehicle front side portion of the surface rigidity holding portion 30 is easily folded from the standing portion 26, so that the movement of the standing portion 26 toward the vehicle rear side is hindered by the vehicle front side portion of the surface rigidity holding portion 30. Can be prevented.

  In addition, since the notch 28 is provided in the front portion of the standing portion 26, the rigidity of the front portion of the standing portion 26 is lower than the rigidity of the rear portion of the standing portion 26 with a simple structure. Can be made. Moreover, since the rigidity reducing means of the present invention is formed in the notch 28, the rigidity reducing means can be configured in the standing portion 26 with a simple structure.

[Second Embodiment]
FIG. 5 shows a bumper structure 50 according to the second embodiment of the present invention in a sectional view as seen from the left side of the vehicle.

  The bumper structure 50 according to the present embodiment has substantially the same configuration as the first embodiment, but differs in the following points.

  In the bumper structure 50 according to the present embodiment, in the absorber 20, the vehicle rear side end portion (the protruding portion from the energy absorbing portion 22 to the vehicle rear side) of the standing portion 26 is on the vehicle upper side surface of the bumper reinforcement 16. It is placed.

  Here, also in this embodiment, the same operations and effects as those in the first embodiment can be obtained.

  Further, as described above, the vehicle rear side end portion of the standing portion 26 of the absorber 20 is placed on the vehicle upper side surface of the bumper reinforcement 16. For this reason, when a load is applied to the vehicle upper side wall of the bumper cover 14 from the upper side of the vehicle due to a person's hand on the upper side surface of the bumper cover 14 or the like, When the vehicle upper side surface of the bumper reinforcement 16 receives the load F1 acting on the surface rigidity holding portion 30 of the vehicle 20 from the upper side of the vehicle through the standing portion 26, the energy from the energy absorbing portion 22 by the notch 28 of the standing portion 26 is reduced. Breakage can be effectively prevented, and the shape of the vehicle upper side wall of the bumper cover 14 can be effectively retained.

  In the first embodiment and the second embodiment, the notch 28 (fragile portion) opened to the front side of the vehicle as a rigidity reducing means is provided in the front side portion of the vehicle at the lower end of the standing portion 26. However, a hollow (fragile portion) that does not open to the front side of the vehicle as a rigidity reducing means may be formed in the front side portion of the vehicle lower side end of the standing portion 26.

  Furthermore, in the first embodiment and the second embodiment, the standing portion 26 is separated from the energy absorbing portion 22 at the time of the frontal collision of the vehicle. However, the standing portion 26 is at the time of the frontal collision of the vehicle. However, it is not necessary to completely detach from the energy absorbing portion 22, and any configuration that can prevent the standing portion 26 from inhibiting the compressive deformation of the energy absorbing portion 22 may be used.

  In the first embodiment and the second embodiment, the bumper structures 10 and 50 are applied to the front bumper 12 at the front end of the vehicle. However, the bumper structures 10 and 50 are arranged on the rear side of the vehicle. The configuration may be applied to the rear bumper (bumper) at the end.

It is sectional drawing seen from the vehicle left side which shows the bumper structure which concerns on the 1st Embodiment of this invention. (A) And (B) is sectional drawing seen from the vehicle left side which shows the load action condition to the absorber in the bumper structure which concerns on the 1st Embodiment of this invention, (A) is a bumper cover It is a figure which shows the time of a load having acted on the vehicle upper side wall from the vehicle upper side, and (B) is a figure which shows a time when a vehicle collides frontally with the collision partner. It is a graph which shows the relationship between the displacement of the standing part of an absorber in the bumper structure which concerns on the 1st Embodiment of this invention, and the load which acts on the standing part of an absorber. It is sectional drawing seen from the vehicle left side which shows the bumper structure in which only the energy absorption part is provided in the absorber and the standing part is not provided. It is sectional drawing seen from the vehicle left side which shows the bumper structure which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

10 Bumper structure 12 Front bumper (bumper)
14 Bumper cover 16 Bumper reinforcement 20 Absorber 22 Energy absorption part 26 Standing part 28 Notch (Rigidity reduction means)
30 Surface rigidity holder (shape holder)
50 Bumper structure

Claims (4)

A bumper cover provided on the outer surface of the bumper of the vehicle;
Bumper reinforcement for reinforcing the bumper;
An absorber disposed between the bumper cover and the bumper reinforcement;
An energy absorbing portion that is provided on the absorber and is arranged outside the bumper reinforcement and capable of absorbing collision energy;
A standing portion provided on the absorber, and standing on the vehicle upper side from the energy absorbing portion;
A shape holding portion that is provided on a vehicle upper side portion of the upright portion and is capable of holding the shape of the bumper cover;
Rigidity reduction means provided at the standing portion for reducing the rigidity of the vehicle outer portion of the standing portion as compared to the rigidity of the vehicle inner portion of the standing portion;
Bumper structure with   2. The apparatus according to claim 1, wherein the standing portion is erected on a vehicle upper side from a vehicle inner side portion of the energy absorbing portion, and the rigidity reducing means is provided on a vehicle outer portion of the standing portion. Bumper structure.   3. The bumper structure according to claim 1, wherein the rigidity reducing means is formed in a notch shape and is disposed on the vehicle upper side of the front side surface of the bumper reinforcement. 4.   The bumper structure according to any one of claims 1 to 3, wherein a vehicle lower side portion of the standing portion is brought into contact with a vehicle upper side surface of the bumper reinforcement.

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