JP4086694B2 - Bumper absorber for pedestrian protection - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pedestrian protection bumper absorber, and more particularly to a pedestrian protection bumper absorber that protects a pedestrian during a collision in a vehicle such as an automobile.
[0002]
[Prior art]
  Traditionally,FIG.As shown in FIG. 2, in a bumper absorber of a vehicle such as an automobile, a bumper absorber (also referred to as an energy absorber) 104 is disposed in a bumper cover (also referred to as a shell) 102 of the bumper 100. The cross-sectional shape orthogonal to the longitudinal direction of the bumper absorber 104 is a U-shape with the opening 106 facing the front of the vehicle, and a vehicle rear side portion 104A in which a plurality of convex portions 108 are formed toward the rear of the vehicle. However, it is fixed to bumper reinforcement (also referred to as attachment means) 110 (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 57-47234
[0004]
[Problems to be solved by the invention]
  However, in this bumper absorber 104, when a load acts from the front of the vehicle at the time of a collision,FIG.As shown by a two-dot chain line, the upper wall portion 104B and the lower wall portion 104C of the bumper absorber 104 are compressed and deformed in the vehicle front-rear direction. As a result, the impact load received from the bumper absorber 104 by the pedestrian who collided with the bumper increases in proportion to the compression ratio of the bumper absorber 104.
[0005]
In view of the above facts, an object of the present invention is to provide a bumper absorber for protecting a pedestrian capable of suppressing an increase in impact load acting on a pedestrian that collides with a bumper.
[0006]
[Means for Solving the Problems]
  The present invention according to claim 1 is a bumper absorber for protecting a pedestrian comprising a foamed molded body, the longitudinal direction of which is disposed in the bumper cover along the vehicle width direction and absorbs collision energy.
  A cross-sectional shape perpendicular to the longitudinal direction, a front cutout portion cut out from the vehicle front side; and
  The cross-sectional shape orthogonal to the longitudinal direction isNotched from the rear of the vehicleThe front notch andHave overlapping parts in the vehicle vertical directionA rear notch,
  An upper wall portion that is an inclined portion that opens upward when a load of a predetermined value or more is applied from the front of the vehicle;
  A lower wall portion that is an inclined portion that opens downward when a load of a predetermined value or more is applied from the front of the vehicle;
  An opening suppression means for suppressing an opening of the upper wall portion and the lower wall portion at an initial stage when a load is applied from the front of the vehicle;
  The opening restraining means is a rib formed at a predetermined interval in the longitudinal direction at least in the notch portion on the vehicle rear side, and the rib includes a predetermined amount of the upper wall portion and the lower wall portion. Break when bentIt is characterized by that.
[0007]
  Therefore, a load exceeding a predetermined value acts from the front of the vehicle at the time of a collision.When,A front notch part and a rear notch part open, and an upper wall part and a lower wall part of a bumper absorber spread in the vehicle vertical direction. As a result, the upper wall portion and the lower wall portion of the bumper absorber are not compressed and deformed in the vehicle front-rear direction. For this reason, the impact body can suppress an increase in impact load received from the bumper absorber.Further, at the initial stage when a load is applied to the bumper absorber from the front of the vehicle, the upper wall portion and the lower wall are formed by the action of ribs formed at predetermined intervals in the longitudinal direction at least in the notch portion on the vehicle rear side, which is an opening suppression means. When the opening with the portion is suppressed, and then the upper wall portion and the lower wall portion are curved and deformed by a predetermined amount, the rib breaks. As a result, the rising of the initial load level when a load is applied to the bumper absorber from the front of the vehicle can be raised as compared to the rising when no rib is provided.
[0008]
  The present invention according to claim 2 is a bumper absorber for protecting a pedestrian comprising a foam molded body in which a longitudinal direction is arranged along a vehicle width direction in a bumper cover and absorbs collision energy,
  A cross-sectional shape perpendicular to the longitudinal direction, a front cutout portion cut out from the vehicle front side; and
  A rear notch having a cross-sectional shape orthogonal to the longitudinal direction is cut out from the vehicle rear side, and has a portion overlapping the front notch in the vehicle vertical direction;
  An upper wall portion that is an inclined portion that opens upward when a load of a predetermined value or more is applied from the front of the vehicle;
  A lower wall portion that is an inclined portion that opens downward when a load of a predetermined value or more is applied from the front of the vehicle;
An opening suppression means for suppressing an opening of the upper wall portion and the lower wall portion at an initial stage when a load is applied from the front of the vehicle;
  The opening restraining means is a fixing means for fixing the upper wall portion and the lower wall portion to bumper reinforcement, and the fixing means is configured such that the upper wall portion and the lower wall portion are curved and deformed by a predetermined amount. Then the fixation is releasedIt is characterized by that.
[0009]
  Therefore, when a load greater than a predetermined value is applied from the front of the vehicle during a collision,A front notch part and a rear notch part open, and an upper wall part and a lower wall part of a bumper absorber spread in the vehicle vertical direction. As a result, the upper wall portion and the lower wall portion of the bumper absorber are not compressed and deformed in the vehicle front-rear direction. For this reason, the impact body can suppress an increase in impact load received from the bumper absorber. In addition, when the load is applied to the bumper absorber from the front of the vehicle, the upper wall portion and the lower wall portion are opened by the action of the fixing means for fixing the upper wall portion and the lower wall portion, which are opening restraining means, to the bumper reinforcement. Then, when the upper wall portion and the lower wall portion are curved and deformed by a predetermined amount, the fixing by the fixing means is released. As a result, the rising of the initial load level when a load is applied to the bumper absorber from the front of the vehicle can be raised as compared with the rising when no fixing means is provided.
[0010]
  The present invention described in claim 3The bumper absorber for pedestrian protection according to claim 1 or 2, wherein, in a cross-sectional shape perpendicular to the longitudinal direction, the front notch and the rear notch have a portion overlapping in the vehicle vertical direction. ShapeIt is characterized by that.
[0011]
  Therefore,In addition to the contents of claim 1 or claim 2, when a load of a predetermined value or more acts from the front of the vehicle at the time of a collision, the front notch and the rear of the bumper absorber whose cross-sectional shape perpendicular to the longitudinal direction is W-shaped The notch is opened, and the upper wall portion and the lower wall portion of the bumper absorber spread in the vehicle vertical direction. As a result, the upper wall portion and the lower wall portion of the bumper absorber are not compressed and deformed in the vehicle front-rear direction. For this reason, the impact body can suppress an increase in impact load received from the bumper absorber.
[0016]
  Claim 4The invention described isClaims 1-3The bumper absorber for pedestrian protection according to any one of the above, characterized by having a groove formed from the opposite side of the front notch.
[0017]
Therefore, at the initial stage of deformation, a bending load is likely to be generated starting from the groove at a portion opposite to the front notch, so that the rise of the initial load level can be increased. Further, in the later stage of deformation, the portion where the groove is formed spreads and the remaining crushing thickness becomes thin, so that the timing at which the bottomed load is generated can be delayed.
[0018]
  Claim 5The invention described isClaims 1-4In the bumper absorber for pedestrian protection according to any one of the above, the cut angle of the front notch and the cut angle of the rear notch are 10 ° to 15 °.
[0019]
Therefore, the rising angle of the initial load level can be increased and the timing at which the bottomed load is generated by setting the cutting angle of the front notch and the cutting angle of the rear notch to 10 ° to 15 °. Can be delayed.
[0020]
  Claim 6The invention described isClaims 1-4The bumper absorber for pedestrian protection according to any one of the above, wherein the convex part is formed inside the rear notch and is pressed against the bumper reinforcement when a load of a predetermined value or more is applied from the front of the vehicle. It is characterized by having.
[0021]
Accordingly, the rising of the initial load level can be increased by pressing the convex portion formed inside the rear notch portion against the bumper reinforcement. In addition, in the later stage of deformation, the convex portion formed inside the rear notch is pressed against the bumper reinforcement and is broken so that the rear notch expands and the remaining crushing thickness becomes thin, so a bottom load is generated. Timing can be delayed.
[0022]
  Claim 7The invention described isClaim 1The bumper absorber for pedestrian protection according to claim 1, wherein the ribs have a width of 5 mm to 10 mm and a spacing between the ribs of 30 mm to 50 mm.
[0023]
Therefore, the energy absorption performance can be improved by setting the rib width to 5 mm to 10 mm and the rib interval to 30 mm to 50 mm.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
1st Embodiment of the bumper absorber for pedestrian protection in this invention is described according to FIGS.
[0025]
In the figure, the arrow UP indicates the vehicle body upward direction, and the arrow FR in the figure indicates the vehicle body front direction.
[0026]
As shown in FIG. 3, in the present embodiment, a front bumper 12 is disposed along the vehicle width direction at the lower front end of the automobile body 10.
[0027]
As shown in FIG. 1, the bumper reinforcement 14 of the front bumper 12 is disposed along the vehicle width direction, and the cross-sectional shape viewed from the direction perpendicular to the longitudinal direction, that is, the vehicle width direction, is up and down 2. The two rectangular closed cross sections 16 and 18 are connected by the front wall portion 14A.
[0028]
A pedestrian protection bumper absorber 20 is disposed along the vehicle width direction on the front side surface of the front wall portion 14A of the bumper reinforcement 14. The cross-sectional shape seen from the direction perpendicular to the longitudinal direction of the bumper absorber 20 for pedestrian protection, that is, the vehicle width direction, was cut out from the front notch 22 cut out from the vehicle front side and from the vehicle rear side. The upper rear notch 24 and the lower rear notch 26 have a W shape having a portion that overlaps in the vehicle vertical direction. The front notch 22, the upper rear notch 24, and the lower rear notch 26 The overlap length is L. Further, the pedestrian protection bumper absorber 20 is made of a material having a high compressive strength and bending strength, for example, a synthetic resin foam molded article such as a polystyrene resin, a polyethylene resin, a polypropylene resin, a polyester resin, a styrene modified polyethylene resin, or the like. It is made up of and absorbs collision energy. In particular, an in-mold molded product of a styrene-modified polyethylene resin (styrene component 50 to 70% by weight) bead foam is preferable.
[0029]
Further, ribs 30 as opening restraining means are formed in the upper rear notch 24 and the lower rear notch 26 of the bumper absorber 20 for pedestrian protection, respectively. These ribs 30 are provided from the rear side of the vehicle. A triangular notch 32 is formed.
[0030]
As shown in FIG. 2, the ribs 30 are formed in the upper rear notch 24 and the lower rear notch 26 with a predetermined interval in the longitudinal direction, that is, in the vehicle width direction.
[0031]
As shown in FIG. 1, the bumper reinforcement 14 and the pedestrian protection bumper absorber 20 are covered with a bumper cover 36. 20A is facing. Further, the rear wall portion 20B of the pedestrian protection bumper absorber 20 is in contact with the front wall portion 14A of the bumper reinforcement 14, and the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 are defined as follows. , It is an inclined part constituting the upper and lower parts of the W shape.
[0032]
Next, the operation of this embodiment will be described.
[0033]
In the present embodiment, when a pedestrian collides with the front bumper 12, a load acts from the front of the vehicle of the pedestrian protection bumper absorber 20 through the front wall portion 36 </ b> A of the bumper cover 36. At this time, at the initial stage when the load is applied to the pedestrian protection bumper absorber 20, the action of the ribs 30 formed in the upper rear notch 24 and the lower rear notch 26 as shown in FIG. Opening of the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20, that is, upward of the vehicle in the upper wall portion 20C (in the direction of arrow A) and downward of the vehicle in the lower wall portion 20D (in the direction of arrow B). The spread of is suppressed.
[0034]
As a result, the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 are bent as shown in FIG. 4B, for example.
[0035]
Therefore, as shown by the solid line in FIG. 5, the initial impact load rising when the load is applied to the pedestrian protection bumper absorber 20 from the front of the vehicle is used, and when the rib 30 shown by the broken line in FIG. 5 is not provided. It can be raised in comparison.
[0036]
After that, when the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 are curved and deformed by a predetermined amount, the rib 30 is broken starting from the notch 32 as shown in FIG. As a result, the upper wall portion 20C extends upward (in the direction of arrow A) and the lower wall portion 20D extends downward (in the direction of arrow B), so that the pedestrian protection bumper absorber 20 is shown in FIG. Open like. Then, when the thickness is completely compressed, the load increases.
[0037]
For this reason, since the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 are not compressed and deformed in the vehicle front-rear direction, the characteristics of the impact load that the pedestrian receives from the pedestrian protection bumper absorber 20 are: As shown by the solid line in FIG. 5, the latter half rising position S1 is compressed compared to the second half rising position S2 of the impact load when the pedestrian protection bumper absorber having a rectangular cross section shown by the two-dot chain line in FIG. 5 is used. As the rate increases, the load T1 at the position S1 becomes smaller than the load value T2 at the position S2.
[0038]
5 is a load characteristic when the material density of the bumper absorber for a pedestrian protection having a rectangular cross section shown by a two-dot chain line in FIG. 5 is ½ (low density), and at a position S2. The load T3 is small.
[0039]
Therefore, in the present embodiment, it is possible to suppress the rise (bottoming) of the impact load acting on the pedestrian that has collided with the bumper in the latter half, and to increase the load in the initial stage.
[0040]
Moreover, in this embodiment, since the pedestrian protection bumper absorber 20 has the above-described configuration, the pedestrians at each part (center portion, side portion, etc.) along the vehicle width direction of the pedestrian protection bumper absorber 20 are configured. It is possible to cope with the required protection performance only by changing the partial W shape or the shape or interval of the ribs 30, and it is not necessary to change the basic shape, expansion ratio, etc. of the pedestrian protection bumper absorber 20.
[0041]
Next, 2nd Embodiment of the bumper absorber for pedestrian protection based on this invention is described according to FIG.
[0042]
In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.
[0043]
As shown in FIG. 6, in this embodiment, instead of the rib 30 in the first embodiment, an engagement protrusion 40 as an opening restraining means (fixing means) is provided on the rear wall portion 20 </ b> B of the pedestrian protection bumper absorber 20. It is formed on the upper and lower parts. Further, these engagement protrusions 40 are engaged with engagement holes 42 formed in the upper and lower portions of the front wall portion 14A of the bumper reinforcement 14, and the engagement protrusions 40 and the engagement holes 42 are connected to each other. The engagement is released when the upper wall portion 20C and the lower wall portion 20D of the bumper absorber 20 for pedestrian protection are curved and deformed by a predetermined amount.
[0044]
Next, the operation of this embodiment will be described.
[0045]
In the present embodiment, a pedestrian collides with the front bumper 12, and a load acts on the pedestrian protection bumper absorber 20 from the front of the vehicle via the front wall portion 36 </ b> A of the bumper cover 36. At this time, when a load is applied to the pedestrian protection bumper absorber 20, the pedestrian is engaged by the engagement protrusion 40 of the pedestrian protection bumper absorber 20 and the engagement hole 42 of the bumper reinforcement 14. Opening of the upper wall portion 20C and the lower wall portion 20D of the protective bumper absorber 20, that is, spreading of the upper wall portion 20C to the vehicle upper side and the lower wall portion 20D to the vehicle lower side is suppressed.
[0046]
As a result, the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 are bent. For this reason, as shown by a solid line in FIG. 5, the rising of the initial load level when a load is applied to the pedestrian protection bumper absorber 20 from the front of the vehicle is shown in FIG. It is possible to raise compared to the rise when no is provided.
[0047]
Thereafter, when the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 are curved and deformed by a predetermined amount, the engagement protrusion 40 of the pedestrian protection bumper absorber 20 and the engagement hole 42 of the bumper reinforcement 14 are obtained. Is disengaged. As a result, the upper wall portion 20C spreads upward and the lower wall portion 20D spreads downward of the vehicle, so that the pedestrian protection bumper absorber 20 opens.
[0048]
For this reason, since the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 are not compressed and deformed in the vehicle front-rear direction, the characteristics of the impact load that the pedestrian receives from the pedestrian protection bumper absorber 20 are: As shown by the solid line in FIG. 5, the latter half rising position S1 is compressed compared to the second half rising position S2 of the impact load when the pedestrian protection bumper absorber having a rectangular cross section shown by the two-dot chain line in FIG. 5 is used. As the rate increases, the load T1 at the position S1 becomes smaller than the load value T2 at the position S2.
[0049]
Therefore, in the present embodiment, it is possible to suppress the rise (bottoming) of the impact load acting on the pedestrian that has collided with the bumper in the latter half, and to increase the load in the initial stage.
[0050]
Moreover, in this embodiment, since the pedestrian protection bumper absorber 20 has the above-described configuration, the pedestrians at each part (center portion, side portion, etc.) along the vehicle width direction of the pedestrian protection bumper absorber 20 are configured. It is possible to cope with the required protection performance only by changing the partial W shape, and it is not necessary to change the basic shape, expansion ratio, etc. of the pedestrian protection bumper absorber 20.
[0051]
In the present embodiment, the engagement protrusion 40 of the bumper absorber 20 for pedestrian protection and the engagement hole 42 of the bumper reinforcement 14 are engaged, but instead, as shown in FIG. The upper and lower portions of the rear wall portion 20B of the bumper absorber 20 for pedestrian protection and the upper and lower portions of the front wall portion 14A of the bumper reinforcement 14 are bonded to each other by an adhesive 46 as an opening restraining means (fixing means). When the upper wall portion 20C and the lower wall portion 20D of the bumper absorber 20 for pedestrian protection are curved and deformed by a predetermined amount, the bonded portion by the adhesive 46 may be broken.
[0052]
Next, a third embodiment of the pedestrian protection bumper absorber according to the present invention will be described with reference to FIGS. 8 (A) to 8 (C) and FIG.
[0053]
In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.
[0054]
As shown in FIG. 8A, in this embodiment, the intermediate wall portion 20E and the intermediate wall portion 20F, which are located between the upper wall portion 20C and the lower wall portion 20D in the pedestrian protection bumper absorber 20, are connected. A groove 70 having a V-shaped cross section is formed along the vehicle width direction from the opposite side (bumper reinforcement 14 side) of the front notch 22 at the center in the up-down direction of the rear wall portion 20B.
[0055]
Next, the operation of this embodiment will be described.
[0056]
As in the first embodiment, when a pedestrian collides with the front bumper 12, a load acts from the front of the vehicle of the pedestrian protection bumper absorber 20 via the front wall portion 36A of the bumper cover 36. At this time, in this embodiment, in the initial stage when a load is applied to the pedestrian protection bumper absorber 20, as shown in FIG. 8B, the center in the vertical direction of the rear wall portion 20B of the pedestrian protection bumper absorber 20 is used. The bending load F1 is likely to be generated in the intermediate wall portions 20E and 20F of the bumper absorber 20 for protecting the pedestrian, starting from the groove 70 formed from the opposite side of the front notch 22 in the portion. For this reason, the rising of the initial load level can be increased.
[0057]
Further, in the later stage of deformation, as shown in FIG. 8C, the rear wall portion 20B in which the groove 70 is formed spreads in the vertical direction (in the direction of arrow H), whereby the crushed remaining thickness of the pedestrian protection bumper absorber 20 is obtained. M becomes thinner. For this reason, the timing which a bottomed load generate | occur | produces can be delayed.
[0058]
For this reason, in this embodiment, as shown by a solid line in FIG. 9, the rising of the initial impact load when a load is applied to the pedestrian protection bumper absorber 20 from the front of the vehicle is indicated by a groove 70 indicated by a two-dot chain line in FIG. The rise position S1 of the second half of the impact load is higher than the rise position S2 of the second half of the impact load when the groove 70 indicated by the dashed line in FIG. 9 is not provided. The compression ratio is high.
[0059]
Therefore, in the present embodiment, it is possible to suppress the rise (bottoming) of the impact load acting on the pedestrian that has collided with the bumper in the latter half, and to increase the load in the initial stage.
[0060]
In the present embodiment, the cross-sectional shape of the groove 70 is V-shaped, but the cross-sectional shape of the groove 70 is not limited to V-shape, and may be other cross-sectional shapes such as U-shape.
[0061]
Next, 4th Embodiment of the bumper absorber for pedestrian protection based on this invention is described according to FIG.
[0062]
In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.
[0063]
As shown in FIG. 10, in this embodiment, the cutting angle θ <b> 1 of the front notch 22 in the pedestrian protection bumper absorber 20 is set to 10 ° to 15 °, and the pedestrian protection bumper absorber 20 The cut angle θ2 of the upper rear notch 24 and the lower rear notch 26 is set to 10 ° to 15 °.
[0064]
Next, the operation of this embodiment will be described.
[0065]
As in the first embodiment, when a pedestrian collides with the front bumper 12, a load acts from the front of the vehicle of the pedestrian protection bumper absorber 20 via the front wall portion 36A of the bumper cover 36. At this time, in this embodiment, the cutting angle θ1 of the front notch 22 and the cutting angle θ2 of the upper rear notch 24 and the lower rear notch 26 are set to be smaller than 15 °. At the initial stage when a load is applied to the bumper absorber 20 for a pedestrian, the bumper absorber 20 for protecting pedestrians becomes difficult to be deformed, and the rise of the initial load level can be increased.
[0066]
Further, since the cut angle θ1 of the front cutout portion 22 and the cut angle θ2 of the upper rear cutout portion 24 and the lower rear cutout portion 26 are set to be larger than 10 °, the pedestrian protection bumper is used in the later stage of deformation. Since the thickness of the remaining crush of the absorber 20 is reduced, the timing at which the bottomed load is generated can be delayed.
[0067]
For this reason, in this embodiment, compared with the case where the cutting angle θ1 of the front notch 22 and the cutting angle θ2 of the upper rear notch 24 and the lower rear notch 26 are not set to 10 ° to 15 °. The rise of the initial impact load in which a load is applied to the person-protecting bumper absorber 20 from the front of the vehicle can be raised, and the latter half rise position of the impact load is a position with a high compressibility.
[0068]
Therefore, in the present embodiment, it is possible to suppress the rise (bottoming) of the impact load acting on the pedestrian that has collided with the bumper in the latter half, and to increase the load in the initial stage.
[0069]
Next, a fifth embodiment of the bumper absorber for pedestrian protection according to the present invention will be described with reference to FIGS. 11 (A) to 11 (C) and FIG.
[0070]
In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.
[0071]
As shown in FIG. 11 (A), in this embodiment, a corner as a convex portion from the end on the rear wall portion 20B side of the upper wall portion 20C to the inside of the upper rear notch portion 24 in the bumper absorber 20 for pedestrian protection. (G) part 20G is formed along the vehicle width direction, and the corner part 20G as a convex part from the end of the rear wall part 20B side of the lower wall part 20D is also provided inside the lower rear notch part 26. It is formed along the width direction.
[0072]
Further, the upper edge portion 14B and the lower edge portion 14C of the front wall portion 14A of the bumper reinforcement 14 are in contact with the corner portions 20G of the bumper absorber 20 for protecting pedestrians, respectively.
[0073]
As shown in FIG. 11B, the corner portion 20G of the pedestrian protection bumper absorber 20 is applied to the bumper reinforcement 14 when a load of a predetermined value or more acts on the pedestrian protection bumper absorber 20 from the front of the vehicle. It is pressed and broken.
[0074]
Next, the operation of this embodiment will be described.
[0075]
As in the first embodiment, when a pedestrian collides with the front bumper 12, a load acts from the front of the vehicle of the pedestrian protection bumper absorber 20 via the front wall portion 36A of the bumper cover 36. At this time, in this embodiment, when the load is applied to the pedestrian protection bumper absorber 20, the upper edge 14B and the lower edge of the front wall portion 14A of the bumper reinforcement 14 are shown in FIG. 11A. Since the edge portion 14C is in contact with the corner portion 20G of the pedestrian protection bumper absorber 20, it is bent into the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20 from the corner portion 20G. A load is easily generated. For this reason, the rising of the initial load level can be increased.
[0076]
Further, in the later stage of deformation, as shown in FIG. 11B, the corner portion 20G of the bumper absorber 20 for pedestrian protection is pressed by the bumper reinforcement 14 and is broken. For this reason, the bumper reinforcement 14 enters between the upper wall portion 20C and the lower wall portion 20D of the pedestrian protection bumper absorber 20, and as shown in FIG. 11C, the upper wall portion 20C and the lower wall portion 20D. Is spread in the vertical direction (arrow H direction), the thickness of the remaining crusher of the bumper absorber 20 for protecting pedestrians is reduced. For this reason, the timing which a bottomed load generate | occur | produces can be delayed.
[0077]
For this reason, in the present embodiment, as shown by a solid line in FIG. 12, the rising of the initial impact load when a load is applied to the pedestrian protection bumper absorber 20 from the front of the vehicle is shown in FIG. Compared to the rise when 20G is not provided, the second half rise position S1 of the impact load becomes a position having a higher compressibility than the breaking point P of the corner portion 20G. It becomes a position where the compression rate is higher than the latter half rising position S2 of the impact load when the corner 20G indicated by the broken line is not provided.
[0078]
Therefore, in the present embodiment, it is possible to suppress the rise (bottoming) of the impact load acting on the pedestrian that has collided with the bumper in the latter half, and to increase the load in the initial stage.
[0079]
In the present embodiment, the corner portion 20G as the convex portion is formed on the bumper absorber 20 for protecting the pedestrian, but the convex portion is not limited to the corner portion 20G, and as shown in FIG. Other protrusions such as ribs 20H formed at predetermined intervals may be formed.
[0080]
Next, a sixth embodiment of the bumper absorber for pedestrian protection according to the present invention will be described with reference to FIGS.
[0081]
In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.
[0082]
As shown in FIG. 14, in this embodiment, the width W of the ribs 30 in the pedestrian protection bumper absorber 20 is 5 mm to 10 mm, and the interval P between the adjacent ribs 30 is 30 mm to 50 mm.
[0083]
Next, the operation of this embodiment will be described.
[0084]
In this embodiment, the width W of the rib 30 in the bumper absorber 20 for pedestrian protection is 5 mm to 10 mm, and the interval P between the adjacent ribs 30 is 30 mm to 50 mm. Therefore, as shown in FIG. The impact load value T1 when the compression ratio of the pedestrian protection bumper absorber 20 along the vehicle longitudinal direction is 50% is increased by about 40% compared to the impact load value T2 when the rib 30 is not provided. For this reason, energy absorption performance can be improved.
[0085]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.
[0086]
For example, as shown in FIG. 16, the pedestrian protection bumper absorber 20 may be configured so that the front-rear direction is reversed.
[0087]
Moreover, in each said embodiment, the cross-sectional shape seen from the direction orthogonal to the longitudinal direction of the bumper absorber 20 for pedestrian protection is notched from the front notch part 22 notched from the vehicle front side, and the vehicle rear side. The upper rear notch portion 24 and the lower rear notch portion 26 have a W shape that overlaps in the vehicle vertical direction, but the cross-sectional shape of the pedestrian protection bumper absorber 20 is not limited to the W shape. As shown in FIG. 17, the cross-sectional shape seen from the direction orthogonal to the longitudinal direction of the pedestrian protection bumper absorber 20 may be a zigzag shape.
[0090]
【The invention's effect】
  A first aspect of the present invention is a bumper absorber for protecting a pedestrian comprising a foamed molded body that is disposed in a bumper cover along a vehicle width direction and absorbs collision energy, and is orthogonal to the longitudinal direction. A cross-sectional shape, a front notch cut out from the front side of the vehicle;The cross-sectional shape perpendicular to the longitudinal direction isNotched from the rear of the vehicle, With front notchHave overlapping parts in the vehicle vertical directionA rear notch, an upper wall portion that is an upward opening when a load of a predetermined value or more is applied from the front of the vehicle, and an inclined portion that is opened downward when a load of a predetermined value or more is applied from the front of the vehicle And an opening suppression means that suppresses the opening of the upper wall part and the lower wall part at the initial stage when a load is applied from the front of the vehicle, and the opening suppression means is at least on the vehicle rear side. The ribs are formed in the notch portion with a predetermined interval in the longitudinal direction, and the rib breaks when the upper wall portion and the lower wall portion are curved and deformed by a predetermined amount.Therefore, it has the outstanding effect that the rise of the impact load which acts on the pedestrian who collided with the bumper can be suppressed.Moreover, it has the outstanding effect that the rise of the initial load level when a load is applied to the bumper absorber from the front of the vehicle can be raised as compared with the rise when no rib is provided as an opening restraining means.
[0091]
  The present invention according to claim 2 is a bumper absorber for protecting a pedestrian comprising a foamed molded body that is disposed in the bumper cover along the vehicle width direction and absorbs collision energy, and is orthogonal to the longitudinal direction. A cross-sectional shape, a front notch cut out from the front side of the vehicle;A cross-sectional shape perpendicular to the longitudinal direction is cut out from the vehicle rear side, and a rear cutout portion having a portion overlapping with the front cutout portion in the vehicle vertical direction, and upward when a load of a predetermined value or more is applied from the front of the vehicle An upper wall portion that is an inclined portion that opens, a lower wall portion that is an inclined portion that opens downward when a load of a predetermined value or more is applied from the front of the vehicle, and an upper portion that is An opening restraining means for restraining the opening between the wall portion and the lower wall portion, and the opening restraining means is a fixing means for fixing the upper wall portion and the lower wall portion to the bumper reinforcement, and the fixing means is the upper wall. Since the fixing is released when the portion and the lower wall portion are curved and deformed by a predetermined amount, it has an excellent effect that an increase in impact load acting on a pedestrian that has collided with the bumper can be suppressed. In addition, the initial load level rising when a load is applied to the bumper absorber from the front of the vehicle can be increased compared to the rising in the case where the fixing means as the opening suppression means is not provided.
[0092]
  The present invention described in claim 3The bumper absorber for pedestrian protection according to claim 1 or 2, wherein, in a cross-sectional shape perpendicular to the longitudinal direction, the front notch and the rear notch have a portion overlapping in the vehicle vertical direction. Since it is a shape, in addition to the effect of Claim 1 or Claim 2, it has the outstanding effect that a collision body can suppress the raise of the impact load which receives from a bumper absorber.
[0095]
  Claim 4The invention described isClaims 1-3In the bumper absorber for pedestrian protection according to any one of the above, since it has a groove formed from the opposite side of the front notch, it is possible to increase the rise of the initial load level and It has an excellent effect that the timing of occurrence can be delayed.
[0096]
  Claim 5The invention described isClaims 1-4In the bumper absorber for pedestrian protection according to any one of the above, since the incision angle of the front notch and the incision angle of the rear notch are set to 10 ° to 15 °, the rising of the initial load level is increased. In addition, it has an excellent effect that the timing at which the bottomed load is generated can be delayed.
[0097]
  Claim 6The invention described isClaims 1-4In the bumper absorber for protecting pedestrian according to any one of the above, a convex portion that is formed inside the rear notch and is pressed by the bumper reinforcement and breaks when a load of a predetermined value or more is applied from the front of the vehicle. Therefore, the rise of the initial load level can be increased, and the timing at which the bottomed load is generated can be delayed.
[0098]
  Claim 7The invention described isClaim 1In the pedestrian protection bumper absorber described in 1), since the rib width is 5 mm to 10 mm and the rib interval is 30 mm to 50 mm, the energy absorbing performance can be improved.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view taken along line 1-1 of FIG.
FIG. 2 is a perspective view of the pedestrian protection bumper absorber according to the first embodiment of the present invention as seen from the obliquely rearward side of the vehicle.
FIG. 3 is a perspective view of the vehicle body to which the pedestrian protection bumper absorber according to the first embodiment of the present invention is applied, as seen from the oblique front of the vehicle.
FIGS. 4A to 4D are operation explanatory views of a pedestrian protection bumper absorber according to the first embodiment of the present invention. FIGS.
FIG. 5 is a graph showing load characteristics of a pedestrian protection bumper absorber.
FIG. 6 is a cross-sectional view corresponding to FIG. 1 showing a pedestrian protection bumper absorber according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view corresponding to FIG. 1 showing a pedestrian protection bumper absorber according to a modification of the second embodiment of the present invention.
8A is a side sectional view showing a pedestrian protection bumper absorber according to a third embodiment of the present invention, and FIG. 8B and FIG. 8C are pedestrians according to the third embodiment of the present invention. It is operation | movement explanatory drawing of a bumper absorber for protection.
FIG. 9 is a graph showing load characteristics of a pedestrian protection bumper absorber.
FIG. 10 is a side sectional view showing a pedestrian protection bumper absorber according to a fourth embodiment of the present invention.
FIG. 11 (A) is a perspective view of a pedestrian protection bumper absorber according to a fifth embodiment of the present invention, with a part in cross section, seen from the front of the vehicle, and FIGS. 11 (B) and (C). It is action | operation explanatory drawing of the bumper absorber for pedestrian protection which concerns on 5th Embodiment of this invention.
FIG. 12 is a graph showing load characteristics of a pedestrian protection bumper absorber.
FIG. 13 is a perspective view of a pedestrian protection bumper absorber according to a modification of the fifth embodiment of the present invention as seen from an obliquely front side of the vehicle, with a part in cross section.
FIG. 14 is a perspective view of a pedestrian protection bumper absorber according to a sixth embodiment of the present invention, seen from the obliquely rearward side of the vehicle.
FIG. 15 is a graph showing load characteristics of a pedestrian protection bumper absorber.
FIG. 16 is a cross-sectional view corresponding to FIG. 1 showing a pedestrian protection bumper absorber according to another embodiment of the present invention.
FIG. 17 is a cross-sectional view corresponding to FIG. 1 showing a pedestrian protection bumper absorber according to another embodiment of the present invention.
FIG. 18It is a schematic sectional side view which shows the bumper absorber for pedestrian protection in a prior art.
[Explanation of symbols]
  12 Front bumper
  14 Bumper reinforcement
  14A Front wall of bumper reinforcement
  20 Bumper absorber for pedestrian protection
  20A Front wall of bumper absorber for pedestrian protection
  20B Rear wall of bumper absorber for pedestrian protection
  20C Upper wall of bumper absorber for pedestrian protection
  20D Lower wall part of bumper absorber for pedestrian protection
  20G Corner (convex part) of bumper absorber for pedestrian protection
  20H Rib (convex part) of bumper absorber for pedestrian protection
  22 Front notch
  24 Upper rear notch
  26 Lower rear notch
  30 ribs (opening suppression means)
  32 Notches
  36 bumper cover
  40 Engagement protrusion (opening suppression means, fixing means)
  42 engagement hole
  46 Adhesive (opening suppression means, fixing means)
  70 groove

Claims (7)

A bumper absorber for protecting a pedestrian comprising a foamed molded body that is disposed in the bumper cover along the vehicle width direction and absorbs collision energy.
A cross-sectional shape perpendicular to the longitudinal direction, a front cutout portion cut out from the vehicle front side; and
A rear notch having a cross-sectional shape orthogonal to the longitudinal direction is cut out from the vehicle rear side, and has a portion overlapping the front notch in the vehicle vertical direction ;
An upper wall portion that is an inclined portion that opens upward when a load of a predetermined value or more is applied from the front of the vehicle;
A lower wall portion that is an inclined portion that opens downward when a load of a predetermined value or more is applied from the front of the vehicle;
An opening suppression means for suppressing an opening of the upper wall portion and the lower wall portion at an initial stage when a load is applied from the front of the vehicle;
The opening restraining means is a rib formed at a predetermined interval in the longitudinal direction at least in the notch portion on the vehicle rear side, and the rib includes a predetermined amount of the upper wall portion and the lower wall portion. A bumper absorber for pedestrian protection that breaks when bent and deformed . A bumper absorber for protecting a pedestrian comprising a foamed molded body that is disposed in the bumper cover along the vehicle width direction and absorbs collision energy.
A cross-sectional shape perpendicular to the longitudinal direction, a front cutout portion cut out from the vehicle front side; and
A rear notch having a cross-sectional shape orthogonal to the longitudinal direction is cut out from the vehicle rear side, and has a portion overlapping the front notch in the vehicle vertical direction;
An upper wall portion that is an inclined portion that opens upward when a load of a predetermined value or more is applied from the front of the vehicle;
A lower wall portion that is an inclined portion that opens downward when a load of a predetermined value or more is applied from the front of the vehicle;
An opening suppression means for suppressing an opening of the upper wall portion and the lower wall portion at an initial stage when a load is applied from the front of the vehicle;
The opening restraining means is a fixing means for fixing the upper wall portion and the lower wall portion to bumper reinforcement, and the fixing means is configured such that the upper wall portion and the lower wall portion are curved and deformed by a predetermined amount. Then , the bumper absorber for pedestrian protection is characterized in that the fixation is released . The cross-sectional shape orthogonal to the longitudinal direction is a W shape having a portion in which the front notch and the rear notch overlap in the vehicle vertical direction. Bumper absorber for pedestrian protection. The bumper absorber for pedestrian protection according to any one of claims 1 to 3, further comprising a groove formed from an opposite side of the front notch . The pedestrian protection bumper absorber according to any one of claims 1 to 4, wherein a cut angle of the front cutout portion and a cut angle of the rear cutout portion are set to 10 ° to 15 °. . 5. The projection according to claim 1, further comprising a convex portion that is formed inside the rear notch and is pressed by the bumper reinforcement when the load of a predetermined value or more is applied from the front of the vehicle. The bumper absorber for pedestrian protection according to item . The bumper absorber for pedestrian protection according to claim 1, wherein a width of the rib is set to 5 mm to 10 mm, and a distance between the ribs is set to 30 mm to 50 mm .

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