JP7040082B2 - Vampari Information - Google Patents

Description

The present invention relates to bumper information provided in a bumper of a vehicle.

Conventionally, bumpers arranged at the front end and the rear end of a vehicle are provided with bumper information to absorb a collision load. This bumpy information has a substantially rectangular closed cross-sectional structure as disclosed in Patent Document 1, for example. That is, the bumper information extends between the front plate portion located on the front side in the front-rear direction of the vehicle body, the rear plate portion located on the rear side in the front-rear direction of the vehicle body, and the upper end of the front plate portion and the upper end of the rear plate portion. The upper plate portion, the lower plate portion extending between the lower end of the front plate portion and the lower end of the rear plate portion is provided. Further, as disclosed in Patent Document 1, a configuration in which a reinforcing member is provided inside the bumper reinforcement is also known.

FIG. 5 is a perspective view showing a schematic configuration of a left end portion in the vehicle width direction and a peripheral portion thereof in the rear bumper reinforcement a provided with the reinforcing member. In this figure, the arrow FR indicates the vehicle body front direction, the arrow UP indicates the upward direction, the arrow LH indicates the vehicle body left direction, and the arrow RH indicates the vehicle body right direction. As shown in FIG. 5, as described above, the rear van pari information a includes a front plate portion b, a rear plate portion c, an upper plate portion d, and a lower plate portion e, and the rear van pari information a. Inside, a reinforcing plate portion f as a reinforcing member extending along the horizontal direction is arranged between the front plate portion b and the rear plate portion c. Further, in the rear bumper reinforcement a, the left end portion in the vehicle width direction of the front plate portion b is connected to the rear side member h via the crash box g. Although not shown, the rear vanity information a has the same configuration at the right end in the vehicle width direction.

With this configuration, at the time of a rear collision of the vehicle, the collision load input to the rear bumper reinforcement a is transmitted to the rear side member h via the crash box g, and the collision load is absorbed by the rear side member h.

FIG. 6 is a plan view showing a deformed state of the vehicle body frame at the time of the offset collision test of the rear collision. In the case of an offset collision with a rear collision, the ideal load absorption mode is from the side where the collision load is input (on the left side in the vehicle width direction in the case shown in FIG. 6) via the rear bumper reinforcement a. The load is transmitted toward the side where the collision load is not input (in the case of the one shown in FIG. 6, the right side in the vehicle width direction), and the load is transmitted to the rear side members h and h via the left and right crash boxes g and g. It is required that the load is transmitted and the collision load is absorbed over a wide range of the vehicle body frame. That is, the rear bumper reinforcement a is required to have a high load transmission function in the vehicle width direction.

Japanese Unexamined Patent Publication No. 2017-56760

However, in the case of the offset collision, a part of the colliding object (barrier, etc.) i and existing outside the rear vanity information a in the vehicle width direction (in the case shown in FIG. 6, the rear vanity information a). The part existing on the left side in the vehicle width direction) is deformed so as to wrap around the outside of the rear bumper reinforcement a (outside in the vehicle width direction), and stress is applied to one end of the rear bumper reinforcement a in the vehicle width direction. I may concentrate. That is, the portion that wraps around the outside of the rear van pari information a applies a load diagonally forward to one end of the rear van pari infoment a in the vehicle width direction (the arrow in FIG. 6 is shown). (See), thereby concentrating stress on one end of the rear bumper reinforcement a in the vehicle width direction. In the case of an offset collision on a general road, the collision object corresponds to a vehicle (vehicle that collided backward) or a guardrail.

When such stress concentration occurs, there is a high possibility that cracks or cracks will occur at the end of the rear bumper reinforcement a, and in this case, the cracks or cracks will propagate along the vehicle width direction (this). The direction in which cracks and cracks propagate in the reinforcing plate portion f in this case is indicated by the arrow in FIG. 5), and the load transmission function in the vehicle width direction required for the rear bumper stress a is greatly impaired. Therefore, since it is necessary for the rear side member h on one side (the side to which the collision load is input) to absorb most of the collision load, it is necessary to significantly increase the rigidity of the rear side member h. This is not preferable because it leads to an increase in the weight of the vehicle body.

In the above description, the case of the offset collision of the rear collision has been described as an example, but the same applies to the case of the offset collision of the front collision. That is, even in the front bumper reinforcement, a high load transmission function in the vehicle width direction is required.

The present invention has been made in view of this point, and an object of the present invention is a bumper reinforcement that can avoid stress concentration at one end in the vehicle width direction in the case of an offset collision. Is to provide.

A means of solving the present invention for achieving the above object is between one end of each member member arranged on both sides in the vehicle width direction and extending along the vehicle body front-rear direction on one side in the vehicle body front-rear direction. It is premised on the bumper information that was laid on the ground. For this bumper reinforcement, a reinforcing plate material extending in the horizontal direction is arranged inside a hollow portion having a rectangular closed cross-sectional structure, and the reinforcing plate material has recesses at both ends in the vehicle width direction. Is provided, and when viewed from the direction along the front-rear direction of the vehicle body , the entire outer edge of the recess is located in a part of the region overlapping the member member in the reinforcing plate material, and the entire outer edge of the recess is located in the region. In the above-mentioned concave portion, a portion other than the concave portion extends in the front-rear direction of the vehicle body and is arranged between the vertical intermediate portion of the front plate portion and the vertical intermediate portion of the rear plate portion in the rectangular closed cross-sectional structure. It is characterized by being .

Due to this specific matter, a collision load is input to one side of the bumper reinforcement in the vehicle width direction at the time of an offset collision of the vehicle, and the deformation of the bumper reinforcement due to this collision load is caused by the deformation of the bumper reinforcement on one side in the vehicle width direction in the reinforcing plate material. It proceeds in the recess provided in the portion. For this reason, it is possible to prevent stress from concentrating on a specific part on one side of the bumper reinforcement in the vehicle width direction (stress can be dispersed), and cracks or cracks occur at the end of the bumper reinforcement. It can be suppressed from being stored. Therefore, it is suppressed that the cracks and cracks propagate along the vehicle width direction and the load transmission function in the vehicle width direction in the bumper reinforcement is greatly impaired. As a result, it becomes possible to absorb the collision load in a wide range of the vehicle body frame, it is not necessary to significantly increase the rigidity of the member members, and the weight of the vehicle body can be reduced.

In the present invention, recesses are provided at both ends of the reinforcing plate material arranged inside the hollow of the bumper reinforcement and extending along the horizontal direction in the vehicle width direction. As a result, it is possible to prevent stress from concentrating on a specific part on one side of the bumper reinforcement in the vehicle width direction at the time of an offset collision, and cracks or cracks occur at the end of the bumper reinforcement. Can be suppressed. That is, it is suppressed that the cracks and cracks propagate along the vehicle width direction and the load transmission function in the vehicle width direction in the bumper reinforcement is greatly impaired. As a result, it becomes possible to absorb the collision load in a wide range of the vehicle body frame, it is not necessary to significantly increase the rigidity of the member members, and the weight of the vehicle body can be reduced.

It is sectional drawing of the rear bumper and the peripheral part thereof in Embodiment. It is a perspective view which shows the schematic structure of the left end portion in the vehicle width direction and the peripheral portion thereof of the rear bumper assembly according to the embodiment. It is a figure corresponding to FIG. 2 in the modification 1. FIG. It is a figure corresponding to FIG. 2 in the modification 2. FIG. It is a figure corresponding to FIG. 2 in the prior art. It is a top view which shows the deformation state of the vehicle body frame at the time of the offset collision test of a rear collision.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment describes a case where the present invention is applied to a rear bumper reinforcement provided in a rear bumper arranged at a rear end of a vehicle.

-Rear bumper and its peripheral structure-
FIG. 1 is a cross-sectional view of the rear bumper 1 and its peripheral portion in the present embodiment (a view of a horizontal cross section of the rear bumper 1 and its peripheral portion as viewed from above). Further, FIG. 2 is a perspective view showing a schematic configuration of a left end portion in the vehicle width direction and a peripheral portion thereof of the rear bumper reinforcement 2 in the present embodiment. In these figures, the arrow FR indicates the vehicle body front direction, the arrow UP indicates the upward direction, the arrow LH indicates the vehicle body left direction, and the arrow RH indicates the vehicle body right direction.

As shown in FIG. 1, a rear bumper 1 is provided at the rear end of the vehicle body. The rear bumper 1 extends along the vehicle width direction at the lower part of the rear end of the vehicle body.

Further, a pair of rear side members 3 and 3 extending along the front-rear direction of the vehicle body are arranged at the lower portions on both sides in the vehicle width direction of the vehicle body. These rear side members 3 and 3 have a rectangular closed cross-sectional structure when viewed from the front-rear direction of the vehicle body. The rear side members 3 and 3 are connected to each other by a cross member (not shown) extending along the vehicle width direction.

Lower back panels 31 and 31 extending in the vertical direction and the vehicle width direction of the vehicle body are joined to the rear ends of the rear side members 3 and 3, respectively. Crash boxes 4 and 4 are joined to the rear ends of the rear side members 3 and 3 via the lower back panels 31 and 31. The rear side members 3, 3 and the lower back panels 31, 31 and the crash boxes 4, 4 constitute the member member according to the present invention.

Then, the rear bumper reinforcement 2 is bridged between the rear ends of the crash boxes 4 and 4. The configuration of the rear bumper reinforcement 2 will be described later.

The rear end surface of the rear bumper assembly 2 is provided with a bumper absorber 11 which is made of a flexible material such as urethane foam and absorbs a collision load at the time of a rear collision. The outer periphery of the rear bumper assembly 2 and the bumper absorber 11 is covered with the rear bumper cover 12.

-Structure of rear van pari information-
Next, the rear bumper reinforcement 2 will be described.

As shown in FIG. 2, the rear bumper reinforcement 2 is located on the front side in the front-rear direction of the vehicle body and extends along the vertical direction, and is located on the rear side in the front-rear direction of the vehicle body and along the vertical direction. The extending rear plate portion 22, the upper plate portion 23 extending in the horizontal direction between the upper end of the front plate portion 21 and the upper end of the rear plate portion 22, the lower end of the front plate portion 21 and the rear plate portion. A lower plate portion 24 extending along the horizontal direction is provided between the lower end of the 22 and the lower plate portion 24. Further, the rear bumper reinforcement 2 extends along the horizontal direction between the vertical intermediate portion of the front plate portion 21 and the vertical intermediate portion of the rear plate portion 22 inside the hollow portion thereof. A reinforcing plate portion (reinforcing plate material referred to in the present invention) 25 is arranged. The rear bumper reinforcement 2 is manufactured by extruding an aluminum alloy, and the plate portions 21, 22, 23, 24, 25 are integrated.

The left end portion of the front plate portion 21 in the vehicle width direction is connected to the rear side member 3 via the crash box 4 and the lower back panel 31. Specifically, the front plate portion 21 is welded to the back surface (the surface facing the rear of the vehicle body) of the crash box 4. The rear vanity information 2 has the same configuration at the right end in the vehicle width direction. With this configuration, at the time of a rear collision of the vehicle, the collision load input to the rear bumper reinforcement 2 is transmitted to the rear side member 3 via the crash box 4.

The feature of this embodiment is the shape of the end edges 23a, 24a, 25a on both sides of the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portion 25 in the vehicle width direction. Specifically, the upper plate portion 23, the lower plate portion 24, and the end edges 23a, 24a, 25a on both sides of the reinforcing plate portion 25 in the vehicle width direction are such that the central portion in the vehicle body front-rear direction is inside in the vehicle width direction, respectively. It is formed in a shape (recess) curved toward. In other words, the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portions 25 have a configuration in which the end edges 23a, 24a, 25a on both sides in the vehicle width direction are partially cut out, and the vehicle width thereof. The amount of notch inward in the direction is formed to increase toward the central portion in the front-rear direction of the vehicle body in each of the plate portions 23, 24, and 25. In the present embodiment, the edges 23a, 24a, and 25a have an arcuate shape in a plan view, and the shapes are the same as each other. The shapes of the edge 23a, 24a, and 25a are not limited to the arc shape, and the shapes may be different from each other (for example, arc shapes having different curvatures from each other).

With such a shape, the collision load input from the rear at the time of the rear collision of the vehicle greatly deforms the central portion of the edge 23a, 24a, 25a in the front-rear direction of the vehicle body (for example, deforms so as to bend in the vertical direction). ) Will be.

-Offset collision test of rear collision-
Next, the time of the offset collision test of the rear collision will be described. Here, a case where a collision object (barrier) collides with the left side in the vehicle width direction will be described.

In this case, as shown by the arrow F in FIGS. 1 and 2, the collision load is input to the left side portion of the rear bumper reinforcement 2 in the vehicle width direction. In this case, the deformation of the rear bumper reinforcement 2 due to this collision load is one side in the vehicle width direction in each of the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portion 25 (in this case, the left side in the vehicle width direction). It proceeds at the edge 23a, 24a, 25a made of a curved surface provided in the portion of. Therefore, stress is applied to a specific portion (for example, the boundary portion between the rear plate portion c and the reinforcing plate portion f as shown in FIG. 5) on one side (left side in the vehicle width direction) of the rear bumper reinforcement 2 in the vehicle width direction. It is possible to avoid concentration (stress can be dispersed), and it is possible to prevent cracks and cracks from being generated at the end of the rear bumper reinforcement 2. Therefore, it is possible to prevent the cracks and cracks from propagating along the vehicle width direction and greatly impairing the load transmission function of the rear bumper reinforcement 2 in the vehicle width direction. As a result, it becomes possible to absorb the collision load in a wide range of the vehicle body frame, it is not necessary to significantly increase the rigidity of the rear side members 3 and 3, and the weight of the vehicle body can be reduced.

(Modification 1)
Next, a modification 1 will be described. This modification also improves the shapes of the end edges 23a, 24a, 25a on both sides in the vehicle width direction of the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portion 25 of the rear bumper reinforcement 2. Since other configurations are the same as those of the above-described embodiment, here, only the shapes of the end edges 23a, 24a, 25a on both sides in the vehicle width direction of the plate portions 23, 24, 25 will be described.

FIG. 3 is a diagram corresponding to FIG. 2 in this modified example. As shown in FIG. 3, the shapes of the edge 23a, 24a, 25a on both sides in the vehicle width direction of each plate portion 23, 24, 25 are the vehicle width only at the position near the rear end portion in the vehicle body front-rear direction. Recesses 23b, 24b, 25b having a shape curved toward the inside in the direction are formed. That is, the front end portions and the central portion of the edge portions 23a, 24a, 25a on both sides of the plate portions 23, 24, 25 in the vehicle width direction in the vehicle front-rear direction have a linear shape extending along the vehicle body front-rear direction. On the other hand, the rear end portion in the front-rear direction of the vehicle body has recesses 23b, 24b, 25b having a shape curved inward in the vehicle width direction. In this modification, the shapes of the recesses 23b, 24b, and 25b are the same as each other, but the shapes may be different from each other.

In this modification, during the offset collision test of the rear collision, the deformation of the rear bumper reinforcement 2 due to the collision load is one of the vehicle width direction in each of the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portion 25. It proceeds around the recesses 23b, 24b, 25b provided on the side (in this case, the left side in the vehicle width direction). Therefore, even in this case, it is possible to prevent stress from concentrating on a specific portion on one side (left side in the vehicle width direction) of the rear bumper reinforcement 2 in the vehicle width direction (stress can be dispersed), and the rear bumper can be distributed. It is possible to prevent cracks and cracks from occurring at the end of the reinforcement 2. Therefore, it is possible to prevent the cracks and cracks from propagating along the vehicle width direction and greatly impairing the load transmission function of the rear bumper reinforcement 2 in the vehicle width direction. As a result, it becomes possible to absorb the collision load in a wide range of the vehicle body frame, it is not necessary to significantly increase the rigidity of the rear side members 3 and 3, and the weight of the vehicle body can be reduced.

(Modification 2)
Next, the second modification will be described. In this modification, the configurations of the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portion 25 of the rear bumper reinforcement 2 in the vicinity of the end edges 23a, 24a, 25a on both sides in the vehicle width direction are improved. .. Since other configurations are the same as those of the above-described embodiment, here, only the configurations in the vicinity of the edge 23a, 24a, 25a on both sides in the vehicle width direction in the plate portions 23, 24, 25 will be described.

FIG. 4 is a diagram corresponding to FIG. 2 in this modified example. As shown in FIG. 4, in this modification, the shapes of the end edges 23a, 24a, 25a on both sides of the plate portions 23, 24, 25 in the vehicle width direction are linear extending along the vehicle body front-rear direction. It has become. Further, in the vicinity of the edge 23a, 24a, 25a, recessed portions (recesses) 23c, 24c, 25c are formed in which the plate portions 23, 24, 25 are partially curved downward. That is, the recessed portions 23c, 24c, 25c are formed at the inner positions of the plate portions 23, 24, 25 having a predetermined distance in the vehicle width direction from the edge 23a, 24a, 25a on both sides in the vehicle width direction. In this modification, recessed portions 23c, 24c, and 25c are formed at two locations in the front-rear direction of the vehicle body in each of the plate portions 23, 24, and 25, respectively. Further, the plan view shape of these recessed portions 23c, 24c, 25c is an elliptical shape with the vehicle width direction as the major axis direction. In this modification, the shapes of the recesses 23c, 24c, and 25c are the same, but the shapes may be different from each other.

In this modification, during the offset collision test of the rear collision, the deformation of the rear bumper reinforcement 2 due to the collision load is caused by the depression formed in each of the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portion 25. It proceeds around parts 23c, 24c, and 25c. Therefore, even in this case, it is possible to prevent stress from concentrating on a specific portion on one side (left side in the vehicle width direction) of the rear bumper reinforcement 2 in the vehicle width direction (stress can be dispersed), and the rear bumper can be distributed. It is possible to prevent cracks and cracks from occurring at the end of the reinforcement 2. Therefore, it is possible to prevent the cracks and cracks from propagating along the vehicle width direction and greatly impairing the load transmission function of the rear bumper reinforcement 2 in the vehicle width direction. As a result, it becomes possible to absorb the collision load in a wide range of the vehicle body frame, it is not necessary to significantly increase the rigidity of the rear side members 3 and 3, and the weight of the vehicle body can be reduced.

-Other embodiments-
It should be noted that the present invention is not limited to the above-described embodiment and each of the above-mentioned modifications, and all modifications and applications included in the claims and the range equivalent to the claims are possible.

For example, in the above-described embodiment and each of the above-described modifications, the case where the present invention is applied to the rear bumper reinforcement 2 provided in the rear bumper 1 disposed at the rear end of the vehicle has been described. The present invention is not limited to this, and can be applied to the front bumper reinforcement provided in the front bumper arranged at the front end of the vehicle.

Further, in the above-described embodiment and each of the above-described modifications, recesses (in the above-described embodiment, curved ends) are formed in the upper plate portion 23, the lower plate portion 24, and the reinforcing plate portion 25 of the rear bumper reinforcement 2. The case where the edges 23a, 24a, 25a, the recesses 23b, 24b, 25b in the modified example 1 and the recessed portions 23c, 24c, 25c in the modified example 2 are provided has been described. The present invention is not limited to this, and the recess may be provided only in the reinforcing plate portion 25. Further, in addition to the reinforcing plate portion 25, the recess may be provided only in one of the upper plate portion 23 and the lower plate portion 24.

The present invention is applicable to the rear bumper reinforcement of the vehicle body.

1 Rear bumper 2 Rear bumper reinforcement 23 Upper plate part 24 Lower plate part 25 Reinforcing plate part 23a, 24a, 25a Edge edge 23b, 24b, 25b Recessed part 23c, 24c, 25c Recessed part 3 Rear side member 31 Lower back panel 32 Crash box

Claims (1)

In the bumper reinforcement that is arranged on both sides in the vehicle width direction and extends between the ends on one side in the vehicle body front-rear direction in each member member extending along the vehicle body front-rear direction.
A reinforcing plate material extending in the horizontal direction is arranged inside a hollow portion having a rectangular closed cross-section structure.
The reinforcing plate material is provided with recesses at both ends in the vehicle width direction, and when viewed from the direction along the vehicle body front-rear direction, the reinforcing plate material covers a part of the region overlapping the member member in the reinforcing plate material. The entire outer edge of the recess is located, and the portion other than the recess extends in the front-rear direction of the vehicle body in the region, and the vertical intermediate portion of the front plate portion and the upper and lower portions of the rear plate portion in the rectangular closed cross-sectional structure. Vampari information characterized by being disposed between the middle part of the direction .

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