JP2005297726A - Automobile bumper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automobile bumper capable of decreasing a bending angle to a leg portion of a collided pedestrian, and simultaneously reducing impact force and shearing displacement. <P>SOLUTION: The automobile bumper 100 formed at a front part of a vehicle 200 in a vehicular width direction, comprises an impact absorbing member 3 extended in the vehicular width direction, and attached in front of a bumper beam 2; and a lower portion reinforcing member 4 extended in the vehicular width direction under the shock absorbing member 3 and having a polygonal cross section in a fore-and-aft direction of the vehicle. When receiving impact due to collision from a vehicle front side, the lower portion reinforcing member 4 is deformed to be a bell mouth shape, and a tip end portion remained not yet crushed of the lower portion reinforcing member 4 is positioned ahead a tip end portion remained not yet crushed of the shock absorbing member 3 . <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bumper for an automobile that relieves an impact on a pedestrian leg when a traveling vehicle collides with a pedestrian leg.

When a car having a front hood (bonnet) collides with a pedestrian while traveling, in many cases, the leg of the pedestrian first comes into contact with the front bumper of the vehicle. Therefore, a considerable impact is usually applied to the pedestrian's leg, and injury to the pedestrian's leg is inevitable.
In response to such problems, a vehicle body structure has been proposed that reduces damage to the legs as much as possible when a running vehicle collides with the legs of a pedestrian.
For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-10423) discloses a vehicle body structure that reliably lifts a colliding pedestrian on a front hood of a vehicle.

FIG. 12 shows a front vehicle body structure of a vehicle disclosed in Patent Document 1. In FIG. 12, a front bumper 59 is formed at the front lower portion of the front hood 51 extending forward. The front bumper 59 includes a bumper face 53 and a bumper reinforcement (bumper beam) 57 extending in the vehicle width direction at the rear portion thereof. Further, the bumper face 53 extends in the vehicle width direction below the bumper face 53. And an extending member 63 formed integrally.
Further, a receiving member 62 protruding forward from the vehicle body side structural member 60 is provided behind the extending member 63. A predetermined space S is provided between the front end of the receiving member 62 and the back surface of the extending member 63, and the position where the extending member 63 abuts on the receiving member 62 is a front part of the bumper reinforcement 57. The position is set.

Because of the vehicle front body structure thus configured, when a collision with a pedestrian occurs, the extending member 63 integrally provided at the lower part of the bumper face 53 first moves backward while deforming the interval S. . The extending member 63 abuts on the receiving member 62 on the front side of the bumper reinforcement 57, and the load is received by the receiving member 62.
For this reason, in the event of a collision between the vehicle and the pedestrian, the extension member 63 removes the pedestrian's foot below the pedestrian's knee, and the pedestrian is securely placed on the front hood 51 ( Secondary obstacles (such as pedestrians getting caught under the vehicle) are prevented.
Japanese Patent Laid-Open No. 2001-10423 (page 3, right column, line 1 to page 4, right column, line 9, lines 1 to 3)

  By the way, the load applied to the pedestrian leg due to the collision with the automobile bumper is classified into, for example, “lower leg G”, “shear displacement”, and “bending angle” as injury values, and can be quantified. The “lower leg G” is a load applied from the knee to the lower leg, and the injury value is expressed by a load or acceleration, and the “shear displacement” is between the upper leg and the knee and the lower leg. The injury value is expressed in terms of load or knee flexion angle. The “bending angle” is a load applied to the knee, and the injury value is represented by the load or the knee bending angle.

In the front body structure of an automobile shown in Patent Document 1, the pedestrian can be quickly lifted onto the front hood because the extension member 63 pays the pedestrian's leg below the pedestrian's knee. it can. For this reason, the load applied to the pedestrian's knee is reduced, that is, the “bending angle” at the injury value is reduced.
However, in the vehicle body structure, a metal pipe such as iron is used for the extending member 63 positioned under the front bumper, and a metal plate such as an iron plate is used for the receiving member 62. For this reason, the mechanical rigidity in the lower part of the front bumper is high, and it is inevitable that the impact (load) on the lower leg part becomes large.
Therefore, the “lower leg G” and the “shear displacement” with respect to the lower leg portion are increased, and there has been a problem that the colliding pedestrian is liable to be damaged by a ligament in the knee portion, a local fracture or the like.

  The present invention has been made under the circumstances as described above, and provides a bumper for an automobile that can reduce the bending angle with respect to the legs of a colliding pedestrian and can simultaneously reduce impact force and shear displacement. The purpose is to provide.

  In order to solve the above-mentioned problems, an automobile bumper according to the present invention is an automobile bumper formed in the vehicle width direction at the front portion of the vehicle, and extends in the vehicle width direction, in front of the bumper beam. An impact absorbing member that is attached, and a lower reinforcing member that extends in the vehicle width direction below the impact absorbing member and has a polygonal cross-sectional shape in the longitudinal direction of the vehicle. When receiving an impact, the lower reinforcing member is deformed into a trumpet shape, and the front end portion of the lower reinforcing member is left behind the front end portion of the shock absorbing member. It has the characteristics.

By configuring the lower reinforcing member so that the remaining crushing tip of the lower reinforcing member is located in front of the crushing remaining tip of the shock absorbing member, the lower leg portion of the pedestrian is removed by the remaining crushing tip of the lower reinforcing member. Thereby, a pedestrian can be put on a front hood reliably and the "bending angle" in an injury value can be reduced.
Moreover, since the cross-sectional shape of the lower reinforcing member is formed in a polygon, the cross-sectional shape of the lower reinforcing member can be made into a substantially trumpet shape when it is crushed easily from the edge passing through the apex of the polygon. The lower leg can be received in a wider area and the load can be distributed. That is, the “lower leg G” for the lower leg portion of the pedestrian can be reduced. Furthermore, both the impact absorbing member and the lower reinforcing member absorb the impact, and “shear displacement” as an injury value is reduced.

The lower reinforcing member is preferably attached in surface contact with the vehicle-side structure.
That is, by attaching the lower reinforcing member in surface contact with the vehicle-side structure, the strength at the rear portion of the lower reinforcing member is improved, and only the front portion of the lower reinforcing member can be more easily crushed.
For example, if a lower frame of a radiator panel or the like is used as the vehicle-side structure, there is no need to separately provide a bumper beam or the like (for the lower reinforcing member) as the vehicle-side structure, thereby reducing costs and reducing the vehicle weight. Can be planned.

Further, the lower reinforcing member is installed such that at least one apex is positioned in each of an upper part and a lower part between the front end part and the rear end part of the lower reinforcing member in a cross-sectional shape in the vehicle longitudinal direction. It is preferred that
For example, when the cross-sectional shape is a square or a hexagon, one of the diagonals is located at each of an upper portion and a lower portion between the front end portion and the rear end portion of the lower reinforcing member. If it arrange | positions to, the said diagonal will become a boundary of a crease | fold, and only the front part of a lower reinforcement member will be crushed easily in the case of a collision.

The lower reinforcing member may have a plurality of grooves formed in parallel in the vehicle front-rear direction on a surface facing the rear of the vehicle.
Thus, by forming a groove part parallel to the vehicle front-back direction, the rear part intensity | strength of the said lower reinforcement member can be improved more, and only a front part can be made to be crushed more easily.

Further, it is desirable that the strength of the lower reinforcing member is adjusted by setting an inner angle in a cross-sectional shape in the vehicle longitudinal direction.
That is, the strength of the lower reinforcing member is closely related to the strength and shape of the entire bumper, and needs to be adjusted for each vehicle body layout (vehicle height, etc.). For this reason, the optimum intensity adjustment can be performed for each vehicle type (layout) by adjusting the intensity by setting the interior angle.

The lower reinforcing member is preferably formed as a hollow body. When the lower reinforcing member is crushed, the cross-sectional shape in the vehicle front-rear direction becomes a trumpet shape. However, since the lower reinforcing member is a hollow body, the amount of deformation when crushed can be increased. That is, the area of the front surface (substantially flat portion) deformed in a trumpet shape can be further increased.
Furthermore, when the lower reinforcing member is a hollow body, the weight of the vehicle body can be reduced.

It is desirable that a bumper face including a main bumper portion including the shock absorbing member and an air dam portion including the lower reinforcing member and functioning as an air rectifying member is provided.
By comprising in this way, the effect of the deterioration suppression of the said impact-absorbing member and a lower reinforcement member and the improvement of a design surface can be acquired.
Further, a bumper face including a main bumper portion including the shock absorbing member and an air dam portion functioning as an air rectifying member may be provided, and the lower reinforcing member may be configured by the air dam portion.
With this configuration, since it is not necessary to separately provide a lower reinforcing member in addition to the bumper face, the weight of the vehicle can be reduced, the manufacturing cost can be reduced, and the assembly process can be further simplified. it can.

The cross-sectional shape of the lower reinforcing member is preferably a hexagon.
At this time, by installing the lower reinforcing member so that the apex is located in each of the upper part and the lower part between the front end part and the rear end part of the lower reinforcing member, the crushing by the impact of the collision The cross-sectional shape of the lower reinforcing member can be a trumpet shape having a large front area.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the bending angle with respect to the leg part of the colliding pedestrian, the bumper for motor vehicles which can reduce an impact force and a shear displacement simultaneously can be provided.

  Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective perspective view showing a schematic structure of a bumper for an automobile according to a first embodiment. FIG. 2 is a sectional view of the automobile bumper according to the first embodiment. FIG. 3 is a perspective view of a lower reinforcing member provided in the automobile bumper of FIG. 1. FIG. 4 is a cross-sectional view showing a state in which the automobile bumper of FIG. 1 is crushed by a collision impact from the front. FIG. 5 is a side view showing a state where a pedestrian leg impactor (pedestrian leg model) collides with the automobile bumper of FIG.

As shown in FIG. 1, an automobile bumper 100 mounted in front of a vehicle 200 having a front hood 30 is formed with a resin bumper face 1 that forms an exterior and a hollow interior, and is arranged in the vehicle width direction. And an extended bumper beam 2 made of an aluminum alloy. The bumper beam 2 is fixedly attached to a vehicle body frame (not shown).
In addition, an impact absorbing member 3 attached to the front portion of the bumper beam 2 and interposed between the bumper face 1 is provided, and extends below the impact absorbing member 3 in the vehicle width direction. A lower reinforcing member 4 is provided.

As shown in the sectional side view of FIG. 2, the bumper face 1 has an upper portion fixed to the vehicle body stay 7 by screws 8 and a lower portion attached to a lower frame 5 of a radiator panel, which is one of the vehicle body side components. On the other hand, it is fixed with screws 9.
The shock absorbing member 3 is enclosed in a main bumper portion 1 a formed on the bumper face 1 and attached to the front of the bumper beam 2.
The impact absorbing member 3 is formed of, for example, a foamed resin, and absorbs an impact by being easily crushed when a pedestrian (upper leg) collides, thereby reducing a load applied to the pedestrian's upper leg. Has been.

As shown in FIGS. 2 and 3, the lower reinforcing member 4 is integrally formed with a mounting plate 4a, and the mounting plate 4a is provided with a plurality of screw holes 4b. A plurality of screws 10 are fitted in these screw holes 4 b, and the lower reinforcing member 4 is attached to the lower frame 5. At this time, one surface 4d formed at the rear end portion 4i of the lower reinforcing member 4 is in a state of a vertical plane. The one surface 4 d is in surface contact with the front vertical surface 5 a of the lower frame 5. Accordingly, the lower reinforcing member 4 is enclosed in the air dam portion 1 b formed in the bumper face portion 1 and is fixed to the lower frame 5.
Further, the lower reinforcing member 4 is formed of, for example, a plastic resin, and has a hollow shape inside as shown in FIGS. 2 and 3 and a hexagonal shape (polygonal shape) having a vertex 4v. Is formed. And this lower reinforcement member 4 is attached so that the one vertex 4v may be located in each of the upper part and lower part between the front-end part 4h and the rear-end part 4i in the said cross-sectional shape. In addition, an edge (ridge line) 4e in the vehicle width direction that forms each vertex 4v of the cross-sectional shape is formed in a curved or broken line state.

When an impact is applied to the automobile bumper 100 from the front side, the impact absorbing member 3 and the lower reinforcing member 4 together with the bumper face 1 as shown in FIG. It becomes a state.
At this time, as shown in FIG. 4, the shock absorbing member 3 is almost completely crushed, but only the front part of the lower reinforcing member 4 is crushed, so that the cross-sectional shape becomes a trumpet shape.
That is, as shown in FIG. 2, at the time of non-collision, the lower reinforcing member 4 is attached in a state where at least one surface 4d formed at the rear end portion 4i is in full contact with the vertical front surface 5a of the lower frame 5. The rigidity of the reinforcing member 4 on the vehicle rear side is further strengthened. Furthermore, the cross-sectional shape is a hexagon, and one of the diagonal lines is a vertical line. Therefore, the edges in the vehicle width direction passing through the two upper and lower vertices located on the vertical line are broken lines, and in the event of a collision, even if the front part of the lower reinforcing member 4 is crushed, the rear part is not crushed. The cross-sectional shape becomes a trumpet shape and receives an impact.

Thus, when both the impact absorbing member 3 and the lower reinforcing member 4 are crushed by the impact of the collision, the impact absorbing member 3 is almost completely crushed, but the lower reinforcing member 4 has only the front portion thereof. It will be in a crushed state.
Therefore, as shown in FIG. 4, the distal end portion of the lower reinforcing member 4 that has been crushed and deformed is in a state of projecting forward of the vehicle from the distal end portion of the shock absorbing member 3 that has been crushed and deformed.

  Since the automobile bumper 100 is configured in this way, at the instant after the collision with the pedestrian leg impactor 20, the lower leg 20b is crushed by the air dam portion 1b (lower reinforcing member 4) crushed as shown in FIG. It will be paid. As a result, the upper leg 20a is inclined toward the vehicle 200, and the pedestrian (leg impactor 20) is surely ridden on the front hood 30.

As described above, the automobile bumper 100 has a structure in which a pedestrian is reliably climbed on the front hood 30 when it collides with a pedestrian, and therefore, a “bending angle” with respect to the leg portion of the pedestrian is reduced. be able to.
Further, both the main bumper portion 1a and the air dam portion 1b enclosing the shock absorbing member 3 and the lower reinforcing member 4 have a high energy absorption structure, and can reduce the load on the legs of the pedestrian. it can. In particular, since the crushed shape of the lower reinforcing member 4 becomes a trumpet shape, the contact surface with the lower leg portion of the pedestrian that comes into contact with the lower reinforcing member 4 becomes large. For this reason, the load is more distributed, and the reduction of the “lower leg G” in the injury value can be expected. Furthermore, both the impact absorbing member 3 and the lower reinforcing member 4 absorb the impact, and the “shear displacement” as an injury value is reduced.

In the lower reinforcing member 4 described above, by adjusting the angles θ1 and θ2 shown in the cross-sectional shape of FIG. 2 at the time of molding, the strength against impact from the front of the vehicle can be changed according to the mounting vehicle. is there.
That is, by making the inner angle in the cross-sectional shape variable, the strength of the lower reinforcing member 4 can be adjusted, and optimal strength adjustment can be performed for each vehicle type (layout).
Therefore, in a vehicle having a front hood, the remaining crushing tip of the lower reinforcing member 4 may be protruded forward of the vehicle rather than the crushing remaining tip of the shock absorbing member 3 regardless of the vehicle type (layout). it can.
The angle may be adjusted by adjusting only one of the angles 閘 1 and 閘 2 without adjusting both the angles 閘 1 and 閘 2. Further, instead of the angles 閘 1 and 閘 2, the angle 閘 3 or 閘 4 may be adjusted.

  The lower reinforcing member 4 shown in the first embodiment has an upper portion and a lower portion between the front end portion 4h and the rear end portion 4i of the lower reinforcing member 4 in the cross-sectional shape in the vehicle longitudinal direction. Each diagonal line is attached so that one diagonal line is a vertical line so that one vertex 4v is located. Therefore, the edges in the vehicle width direction passing through the top and bottom vertices 4v positioned on the diagonal line, that is, the edges 4f facing up and down as shown in FIGS. 6 (a) and 6 (b) are respectively formed in a convex shape. (Or may be formed in a concave shape). As a result, when an impact from the front of the vehicle is applied, it is easy to bend along the edge 4f, and only the front of the lower reinforcing member 4 is crushed, so that the cross-sectional shape can be more reliably made into a trumpet shape. .

Alternatively, as shown in FIGS. 7A and 7B, among the surfaces of the lower reinforcing member 4 shown in the first embodiment, a plurality of grooves 4g are formed in parallel with the vehicle rear side surface. May be.
By forming the plurality of groove portions 4g in this way, the rigidity of the lower reinforcing member 4 on the vehicle rear side is further strengthened, and when receiving an impact due to a collision from the front of the vehicle, only the vehicle front side is easily crushed. As a result, the cross-sectional shape can be more reliably formed into a trumpet shape.

According to the first embodiment of the present invention described above, the air dam part, that is, the front end part of the lower reinforcing member 4 located in the lower part of the front bumper is more crushed than the front end part of the shock absorbing member 3 that remains uncrushed. It is configured to be positioned in front of the vehicle.
Therefore, the lower leg part of the colliding pedestrian can be paid out by the air dam part, and the pedestrian can be surely put on the hood. Thereby, "bending angle" can be reduced among the injury values with respect to the lower leg part of a pedestrian.
At this time, the load applied to the lower leg portion of the pedestrian is absorbed by the front portion of the lower reinforcing member 4 being crushed, and the cross-sectional shape of the vehicle in the front-rear direction is surely made into a trumpet shape, thereby The lower leg can be received over a wide area and the load can be distributed. As a result, the “lower leg G” for the lower leg of the pedestrian can be reduced.
Furthermore, both the impact absorbing member 3 and the lower reinforcing member 4 absorb the impact, and the “shear displacement” as an injury value is reduced.

  In the first embodiment, the lower reinforcing member 4 is attached to the lower frame 5 by the attaching plate 4a. However, the method of attaching the lower reinforcing member 4 is not limited to this. For example, as shown in FIG. 8, one surface 4d of the lower reinforcement member 4 and the bumper face 1 are in contact with the vertical surface 5a of the lower frame 5 on the vehicle front side. You may comprise so that it may fix with the screw | thread 11.

Next, a second embodiment according to the present invention will be described with reference to FIG.
FIG. 9A is a cross-sectional view of the automobile bumper according to the second embodiment. Moreover, FIG.9 (b) is sectional drawing which shows the unfolded state before the assembly of an air dam part.
In FIG. 9, those having the same functions and shapes as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

A bumper 101 for an automobile shown in FIG. 9A includes a resin bumper face 12 that forms an exterior, and an aluminum alloy bumper beam 2 that is formed in a hollow state and extends in the vehicle width direction. Prepare. Further, an impact absorbing member 3 attached to the front portion of the bumper beam 2 and interposed between the bumper face 1 is provided.
The bumper face 12 includes a main bumper portion 12a and an air dam portion 12b formed below the main bumper portion 12a. The main bumper portion 12a is attached so as to enclose the shock absorbing member 3, and the air dam portion 12b functions as a lower reinforcing member by being formed in a substantially hexagonal cross section.

  The air dam portion 12b is molded in a developed state as shown in FIG. 9B when the bumper face 12 is molded. As shown in FIG. 9B, the air dam portion 12b is formed with a convex portion 12g that protrudes toward the rear of the vehicle, a fulcrum portion 12c that can be bent, and a protrusion that protrudes forward of the vehicle. A mounting plate 12e and a through hole 12f into which the convex portion 12g is fitted are formed.

At the time of assembly, the rear part of the air dam is rotated around the fulcrum part 12c, the convex part 12g is fitted into the through hole 12f, and fixed by the clip 13, whereby the air dam part 12b is completed.
The air dam portion 12b assembled in this way is attached to the radiator lower frame 5 by the mounting plate 12e and the screw 14 in a state where the rear surface 12d is in surface contact with the vertical surface 5a of the lower frame 5 on the vehicle front side. It is done.

As described above, depending on the second embodiment, the cross-sectional shape of the air dam portion 12b in the vehicle front-rear direction is substantially hexagonal, and functions as a lower reinforcing member, so that the same effect as that of the first embodiment described above can be obtained. Can be obtained.
Furthermore, since it is not necessary to separately provide a lower reinforcing member, the weight of the vehicle can be reduced, the manufacturing cost can be reduced, and the assembly process can be further simplified.

  In the first and second embodiments described above, the cross-sectional shape of the lower reinforcing member 4 in the vehicle front-rear direction is a hexagon as an example of a polygon. However, in the automobile bumper according to the present invention, this For example, a pentagon, an octagon, etc. may be sufficient.

As shown in the second embodiment, a collision experiment with a pedestrian leg impactor was performed using an automobile bumper that constitutes a lower reinforcing member by the shape of the air dam body.
In this embodiment, as shown in FIG. 10, the bumper face is divided into two members, a main bumper portion 21 and an air dam portion 22, and attached to the vehicle body. The main bumper portion 21 is attached to the vehicle body with screws 23 and 24, and the air dam portion 22 is attached to the lower frame 5 with screws 25 and 26.

The air dam portion 22 constitutes a lower reinforcing member. That is, in the state where the air dam portion 22 is attached to the lower frame 5, the cross-sectional shape in the vehicle front-rear direction as the lower reinforcing member is a hexagon. At this time, since the vertical surface 5a of the lower frame 5 bears one side of the hexagon and the one side has high mechanical strength, the rear strength of the lower reinforcing member is improved and only the front portion is crushed. be able to.
Further, a strength adjusting plate 27 was attached to the lower surface of the air dam portion 22, and the strength was adjusted as a lower reinforcing member.

  As the weight conditions of the pedestrian leg impactor that collides with the main bumper portion 21 and the air dam portion 22, the upper leg is 8.6 kg and the lower leg is 4.8 kg. The condition was set so that the impact speed applied to the upper leg was absorbed by the main bumper portion 21 and the impact energy applied to the lower leg was absorbed by the air dam portion 22 at a collision speed of 11.1 m / s.

FIG. 11 shows the experimental results of this example. In the graph of FIG. 11, the vertical axis represents the load applied to the bumper, and the horizontal axis represents the amount of deformation of the bumper. A solid line indicates the crushing characteristic of the main bumper part, and a broken line indicates the crushing characteristic of the air dam part 22.
From this result, it can be confirmed that the load applied to the air dam portion 22 is significantly lower than the load applied to the main bumper portion 21.
Further, the collapse amount of the main bumper portion 21 is larger than the collapse amount of the air dam portion 22, and the difference α can be confirmed. That is, since the air dam portion 22 protrudes forward of the vehicle, the colliding pedestrian is lifted on the hood. Thereby, it turns out that a "bending angle" is reduced as an injury value. Further, by setting the difference α to be small, the “shear displacement” is reduced as the injury value.
Furthermore, the load change in the air dam portion 22 increases without making a sudden change with respect to the deformation amount, and it can be confirmed that the “lower leg G” as the injury value is reduced.

  The automobile bumper according to the present invention can be suitably used for an automobile bumper that reduces an impact on a pedestrian leg when a running vehicle collides with a pedestrian leg.

FIG. 1 is a perspective perspective view showing a schematic structure of a bumper for an automobile according to a first embodiment. FIG. 2 is a sectional view of the automobile bumper according to the first embodiment. FIG. 3 is a perspective view of a lower reinforcing member provided in the automobile bumper of FIG. 1. 4 is a cross-sectional side view of the automobile bumper of FIG. 1 crushed by a collision impact from the front. FIG. 5 is a side view of a state in which a pedestrian leg impactor collides with the automobile bumper of FIG. 1. FIG. 6 is a view showing another form of the lower reinforcing member. FIG. 7 is a view showing still another form of the lower reinforcing member. FIG. 8 is a view showing still another form of the lower reinforcing member. FIG. 9 is a cross-sectional view of the automobile bumper according to the second embodiment. FIG. 10 is a cross-sectional view of the automobile bumper in the embodiment. FIG. 11 is a graph showing the results of the example. FIG. 12 is a cross-sectional view of a conventional automobile bumper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bumper face 1a Main bumper part 1b Air dam part 2 Bumper beam 3 Shock absorption member 4 Lower reinforcement member 4h Front end part 4i Rear end part 4v Vertex 5 Radiator lower frame 100 Bumper 200 Vehicle

Claims (9)

An automobile bumper formed in the vehicle width direction at the front of the vehicle,
An impact absorbing member extending in the vehicle width direction and attached in front of the bumper beam, and extending in the vehicle width direction below the impact absorbing member, and a cross-sectional shape in the vehicle longitudinal direction is formed in a polygonal shape. A lower reinforcing member,
When receiving a shock from the front of the vehicle, the lower reinforcing member is deformed into a trumpet shape, and the remaining crushing tip of the lower reinforcing member is positioned in front of the crushing front of the shock absorbing member. A bumper for an automobile characterized by being configured as described above.   The automobile lower bumper according to claim 1, wherein the lower reinforcing member is attached in surface contact with the vehicle body side structure.   The lower reinforcing member is installed so that at least one apex is positioned in each of an upper portion and a lower portion between the front end portion and the rear end portion of the lower reinforcing member in a cross-sectional shape in the vehicle longitudinal direction. The automobile bumper according to claim 1 or 2, wherein the bumper for an automobile is provided.   4. The automobile bumper according to claim 1, wherein a plurality of grooves are formed in parallel in the vehicle front-rear direction on a surface of the lower reinforcing member facing the rear of the vehicle.   5. The automobile bumper according to claim 1, wherein the strength of the lower reinforcing member is adjusted by setting an inner angle in a cross-sectional shape in a vehicle longitudinal direction.   The automobile lower bumper according to any one of claims 1 to 5, wherein the lower reinforcing member is formed as a hollow body.   The bumper face including a main bumper part including the shock absorbing member and an air dam part including the lower reinforcing member and functioning as an air rectifying member is provided. Automotive bumper described in 1. A bumper face including a main bumper portion containing the shock absorbing member and an air dam portion functioning as an air rectifying member;
The automobile bumper according to claim 1, wherein the lower reinforcing member is constituted by the air dam portion.   The automobile bumper according to any one of claims 1 to 8, wherein a cross-sectional shape of the lower reinforcing member in the vehicle front-rear direction is a hexagon.

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