WO2012147546A1

WO2012147546A1 - Vehicle bumper structure

Info

Publication number: WO2012147546A1
Application number: PCT/JP2012/060227
Authority: WO
Inventors: 伸司大野; 章人宮崎; 増田　出光
Original assignee: スズキ株式会社
Priority date: 2011-04-25
Filing date: 2012-04-16
Publication date: 2012-11-01
Also published as: CN103415417B; JPWO2012147546A1; CN103415417A; JP5742934B2

Abstract

A vehicle bumper structure in which a sheet-metal member (11) having a shape that conforms with the shape of a bumper is integrally formed on the lower part of a resin bumper (10), wherein: the main part of the sheet-metal member (11) is covered with the resin bumper (10); the lower parts of the sheet-metal member (11) and the resin bumper (10) extend towards the rear end of the vehicle; and, of the resin bumper (10) and the sheet-metal member (11) extending towards the rear end of the vehicle, only the sheet-metal member (11) is attached to the radiator support member (5) on a vehicle body frame.

Description

Bumper structure of vehicle

The present invention relates to a bumper structure of a vehicle.

In general, the front end portion of the vehicle is arranged such that the lower front bumper lower periphery on the lower side protrudes toward the front side of the vehicle than the vicinity of the upper front hood (bonnet). For this reason, when a pedestrian's leg, which is a rod-shaped object, hits from the front of the vehicle at the time of a collision, etc., the upper part of the pedestrian's leg tends to move backward and the leg tends to tilt. It was. If the pedestrian's leg is inclining and bites into the front bumper, the load from the front side of the vehicle tends to cause bending and shear stress on the pedestrian's leg, and the load on the leg ( Obstacle value) tended to increase.

Therefore, when a pedestrian's leg hits from the front of the vehicle against the front of the vehicle having such a structure, the lower part of the front bumper is deformed rearward of the vehicle so that the load from the front of the vehicle can be absorbed. Is required. However, if the lower part of the front bumper is deformed too far to the rear of the vehicle, the lower end of the leg part of the pedestrian moves excessively to the rear of the vehicle, and the leg part cannot be bent. At this time, if the rigidity of the vicinity of the lower end of the front bumper that hits the lower end of the leg of the pedestrian is high and it is possible to control energy absorption with respect to the input load, even if the lower end of the leg is moved rearward of the vehicle In the event of a collision, the leg can be kept straight.

Therefore, some conventional vehicle bumpers employ a structure that supports the lower end of the pedestrian's legs by providing a reinforcement or absorber on the back side of the bumper fascia ( For example, see Patent Document 1). Thereby, the leg part of a pedestrian is less likely to bend along the inclined part of the front part of the vehicle, and the leg part is held substantially linearly. Moreover, since it becomes difficult to generate | occur | produce bending stress and shear stress in a leg part, a leg part is protected.

JP 2007-83919 A

However, in the conventional bumper structure described above, since the reinforcement is provided on the back side of the bumper fascia, there is a risk that noise will be generated due to the reinforcement coming into contact with the bumper fascia due to vibration during vehicle running. was there. Therefore, it is necessary to set and provide a clearance between the bumper fascia and the reinforcement, and there is a problem that the design space is wasted and the clearance management becomes complicated. Moreover, when such a clearance is provided, there is a useless deformation in which only the bumper is deformed when the leg of the pedestrian hits, and the amount by which the lower end of the leg moves to the rear of the vehicle increases. There was a risk that the time to absorb the input load would be reduced.

In addition, in the conventional structure, a reinforcement is provided in addition to the body frame for the purpose of increasing the rigidity near the lower end of the bumper, so that the number of parts increases and the productivity decreases. was there. Moreover, there is a similar problem when an absorber is provided. When manufacturing by contacting the bumper and the absorber with the clearance omitted, a joining process is required and the weight of the bumper assembly is increased. There was concern that assembly work would be difficult.

The present invention has been made in view of such a situation, and the object thereof is not to have a complicated configuration, but has both a load absorbing portion and a high-rigidity portion, and a pedestrian's leg portion from the front of the vehicle. Minimize deformation at the bottom of the bumper when hitting the bumper, smoothly transmit the load to the body frame, efficiently absorb the load on the leg, and more reliably reduce the bending of the leg An object of the present invention is to provide a bumper structure for a vehicle.

In order to solve the above-described problems of the prior art, the present invention provides a vehicle bumper structure in which a sheet metal member having a shape along a bumper shape is integrally joined to a lower portion of a resin bumper. The main part of the member is covered with the resin bumper, and the resin bumper and the lower part of the sheet metal member extend toward the rear of the vehicle, and the resin bumper and the sheet metal member extend toward the rear of the vehicle, or Only the sheet metal member is attached to the vehicle body frame.

And in this invention, the plate | board thickness of the back side sheet-metal part extended toward a vehicle rear among the said sheet-metal members is set thicker than the front side sheet-metal part.
Furthermore, in the present invention, a part of the sheet metal member is configured as a tailored blank part by joining the thin sheet metal front side sheet metal part and the sheet metal thick rear side sheet metal part, at least, The front side sheet metal part and the tailored blank part are covered with the resin bumper.

Further, the present invention provides a vehicle bumper structure in which a sheet metal member having a shape along a bumper shape is integrally bonded to a lower back surface of a resin bumper, and the resin bumper and the lower portion of the sheet metal member are The sheet metal member extending toward the rear of the vehicle and extending toward the rear of the vehicle is attached to a vehicle body frame, and the sheet thickness of the rear side sheet metal portion extending toward the rear of the vehicle among the sheet metal members is: It is set to be thicker than the front side sheet metal part.

And in this invention, a part of said sheet-metal member is comprised as a tailored blank part by joining the said sheet | seat thin front-side sheet metal part and the said sheet | seat thick rear-side sheet metal part.
Further, in the present invention, the front end of the buffer structure provided in the body frame is the same as the position of the boundary between the thin sheet metal front portion and the thick sheet metal rear portion in the vehicle side view. Placed in position.

As described above, in the vehicle bumper structure according to the present invention, the sheet metal member having a shape along the shape of the bumper is integrally joined to the lower portion of the resin bumper. The resin bumper and the lower part of the sheet metal member are covered with a resin bumper, and the resin bumper and the sheet metal member, or only the sheet metal member extending toward the rear of the vehicle, extend toward the rear of the vehicle. Therefore, it is possible to have both a load absorbing portion and a highly rigid portion in a relatively simple configuration. That is, in the bumper structure of the present invention, the rigidity of the lower part of the bumper is improved, and the sheet metal member is integrally joined to the vehicle body frame, so that deformation of the fixed part of the bumper due to vibration during vehicle running can be reduced. When the pedestrian's leg hits the bumper from the front of the vehicle, the load from the leg is quickly and reliably transmitted from the bumper to the body frame while minimizing deformation of the lower part of the bumper. can do. Moreover, since the resin bumper and the sheet metal member are integrated and no clearance is provided between them, the load absorbing function can be started from the time when the leg of the pedestrian hits the bumper.
Therefore, according to the bumper structure of the present invention, when the pedestrian's leg hits the bumper at the time of a collision, the load on the leg can be efficiently absorbed, the bending of the leg is reduced, The burden can be reduced more reliably.

Moreover, in the structure of the present invention, the sheet thickness of the rear side sheet metal part extending toward the rear of the vehicle among the sheet metal members is set to be thicker than that of the front side sheet metal part. It is possible to cope with the situation where the rigidity to support and the rigidity necessary to absorb the initial load are different, and it is possible to achieve both of the two functions of load absorption from the front of the vehicle and support of the legs. The amount of movement toward the rear of the vehicle can be controlled so as to keep the legs of the vehicle straight.
Furthermore, in the present invention, a part of the sheet metal member is configured as a tailored blank part by joining the thin sheet metal front side sheet metal part and the sheet metal thick rear side sheet metal part. It can be integrated by press molding of the plate, and the bumper-shaped dimensions can be easily secured. Moreover, in the present invention, at least the front-side sheet metal part and the tailored blank part are covered with the resin bumper, so that a step due to joining does not come out and rainwater and mud accumulate in the step part. Further, it is possible to avoid a situation where rust is generated at the stepped portion, and it is possible to improve the appearance quality.

In the vehicle bumper structure according to the present invention, a sheet metal member having a shape along the shape of the bumper is integrally bonded to the lower back surface of the resin bumper, and the resin bumper and the lower part of the sheet metal member are attached. Is extending toward the rear of the vehicle, the sheet metal member extending toward the rear of the vehicle is attached to the vehicle body frame, and the sheet thickness of the rear side sheet metal portion extending toward the rear of the vehicle among the sheet metal members is Since it is set to be thicker than the front side sheet metal part, it is obtained by separately manufacturing the resin bumper and the sheet metal member, and joining these resin bumper and the sheet metal member. Easy to manufacture. In addition, in the bumper structure of the present invention, the rigidity of the lower portion of the bumper can be secured by the sheet metal member welded to the lower back surface of the resin bumper, and substantially the same effect as the above invention can be obtained.

Furthermore, in the structure of the present invention, a part of the sheet metal member is configured as a tailored blank portion by joining the thin sheet metal front side sheet metal part and the sheet metal thick rear side sheet metal part. The bumper-shaped dimensions can be easily secured by integration by press molding of the joining plate.
In the structure of the present invention, the front end of the buffer structure provided in the vehicle body frame has a boundary between the thin sheet metal front side sheet metal part and the thick sheet metal rear side sheet metal part and the vehicle side view. When the pedestrian's leg hits the bumper from the front of the vehicle, the thin sheet metal part located on the front of the vehicle at the bottom of the bumper is deformed and the load from the leg After absorbing this, it is possible to support the lower end of the leg portion while slowly deforming the thick sheet metal portion located on the rear side of the vehicle having relatively high rigidity. At this time, since the lower end of the leg portion is also supported by the buffer structure portion installed on the vehicle body frame, the deformation can be controlled by both members. In addition, when the deformation of the thick sheet metal portion located on the vehicle rear side and the deformation of the buffer structure portion are completed, the lower end of the leg portion can be supported by the body frame having the highest rigidity. Therefore, in the structure of the present invention, by controlling the deformation of the sheet metal member and the buffer structure portion, it becomes possible to support the pedestrian's legs in a straight line and efficiently absorb the load by the legs. it can.

1 is a perspective view showing an appearance of a vehicle front portion to which a bumper structure according to an embodiment of the present invention is applied. FIG. 2 is a side sectional view showing a front bumper and its peripheral components at the front of the vehicle in FIG. 1. It is the bottom view which looked at the front bumper in Drawing 1 from the vehicles lower part. FIG. 3 is a side sectional view showing an X portion in FIG. 2 in an enlarged manner. FIG. 3 is a side cross-sectional view showing an enlarged main part of a sheet metal member at a lower part of the front bumper in FIG. 2. It is the bottom view which looked at the front bumper of the vehicles to which the bumper structure concerning the modification of the embodiment of the present invention was applied from the vehicles lower part.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
1 to 5 show a vehicle bumper structure according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, the vehicle front portion 1 to which the bumper structure according to the embodiment of the present invention is applied mainly extends along the vehicle front-rear direction and on both the left and right sides in the vehicle width direction. A pair of left and right apron side members 2 arranged at intervals, and a resin bumper net 3 and a front bumper 4 positioned in front of the apron side members 2 are provided. The bumper net 3 is a front bumper 4. It is arranged on the back side.
In the vehicle front portion 1 of the present embodiment, a pedestrian leg L extending corresponding to the vehicle vertical direction is configured to be positioned on the front left side of the front bumper 4 in the vehicle. In addition, in the structure of this embodiment, although the leg part of the human body model for a collision analysis made based on the average physique of an adult male is used as the leg part L of a pedestrian, it is limited to this. is not. Moreover, it is applicable also to other rod-shaped objects other than the pedestrian's leg part L as a collision object.

The apron side member 2 is a rigid member that constitutes the main skeleton of the vehicle front portion 1, and a hood extending in the vehicle width direction is disposed on the upper body side in the vicinity of the front end portion of the apron side member 2 as shown in FIG. A lock member 14 is disposed. Further, a radiator support member 5 of a vehicle body frame extending in the vehicle width direction is disposed on the lower side of the body near the front end portion of the apron side member 2, and is positioned on both the left and right sides by the radiator support member 5 and the like. The lower part of the front end part of the apron side member 2 is connected. Moreover, the hood lock member 14 and the radiator support member 5 are connected to each other by lamp support braces 6 extending in the vehicle vertical direction and arranged on the left and right sides of the vehicle front portion 1.

As shown in FIGS. 2 and 4, the radiator support member 5 of the present embodiment includes an upper panel 7 and a lower panel 8 that are arranged vertically, and the overlapping portions of the upper panel 7 and the lower panel 8 are joined to each other. By doing so, the radiator support member 5 is configured to form a substantially rectangular closed section when viewed from the side of the vehicle. For this reason, the upper panel 7 is bent and formed into a cross-sectional hat shape when viewed from the side of the vehicle, and the lower panel 8 is bent and formed into a cross-sectional crank shape when viewed from the side of the vehicle. In the joined state of the upper panel 7 and the lower panel 8, a vehicle-side-viewed L-shaped portion is formed on the vehicle front side of the substantially square closed cross-section structure, and the L-shaped portion is The buffer structure 9 has a function as a load-absorbing portion that is easily deformable with respect to the closed cross-section structure having high rigidity.

On the other hand, as shown in FIGS. 2 to 5, the front bumper 4 of the present embodiment is insert-molded integrally with a resin bumper 10 disposed on the front end side of the vehicle front portion 1 and a lower portion of the resin bumper 10. In order to obtain a sense of unity with the resin bumper 10, the sheet metal member 11 is bent and formed in a shape along the bumper shape. The main part of the sheet metal member 11 is covered with a resin bumper 10.
The resin bumper 10 and the lower part of the sheet metal member 11 are formed in a shape that extends toward the rear of the vehicle. Moreover, of the resin bumper 10 and the sheet metal member 11 extending toward the rear of the vehicle, only the sheet metal member 11 that is exposed from the resin bumper 10 and further protrudes toward the rear of the vehicle is provided with a radiator support, as indicated by the symbol W in FIG. The lower panel 8 constituting the member 5 is attached to the lower surface of the lower panel 8 by welding or a fastener. For this reason, the vehicle rear side end portion of the sheet metal member 11 is bent obliquely upward toward the lower surface of the lower panel 8 and further bent in the horizontal direction, and a portion that is overlapped and fixed on the lower surface of the lower panel 8 is It is formed in a planar shape.

Further, as shown in FIGS. 4 and 5, the sheet metal member 11 of the present embodiment is disposed on the vehicle front-rear direction, the deformable front sheet metal portion 11 a disposed on the vehicle front side, and the vehicle rear side. It is comprised from two parts of the highly rigid back side sheet-metal part 11b. Among such sheet metal members 11, the sheet thickness of the rear side sheet metal part 11b extending toward the rear of the vehicle is set to be thicker than the sheet thickness of the front side sheet metal part 11a.
For this reason, the sheet metal member 11 is formed by press working in advance on the shape of the front side sheet metal portion 11a of the portion embedded in the resin bumper 10 and the shape of the rear side sheet metal portion 11b of the portion attached to the vehicle body side. A part of 11 is configured as a tailored blank portion 12 by joining a thin front-side sheet metal portion 11a and a thick rear-side sheet metal portion 11b. And the front side sheet metal part 11a and the tailored blank part 12 are set so as not to be exposed to the outside at the time of insert molding, and are covered with the resin bumper 10, and rainwater, mud, etc. It is configured to prevent the accumulation of rust and the occurrence of rust.

Further, as shown in FIG. 4, the front end of the buffer structure portion 9 provided on the radiator support member 5 is positioned at the boundary K between the thin sheet metal front side sheet metal part 11a and the sheet metal thick rear side sheet metal part 11b. They are arranged at the same position as seen from the side of the vehicle. As a result, a region on the vehicle front side from the boundary K is configured as a load (energy) absorption control area A, and a region on the vehicle rear side from the boundary K is configured as a high-rigidity area B.

The vehicle front portion 1 having the bumper structure according to the embodiment of the present invention configured as described above hits a pedestrian's leg L at the time of a collision, and a load from the leg L is applied to the front bumper 4 from the front of the vehicle. , The resin bumper 10 in the load absorption control area A on the vehicle front side from the boundary K and the sheet metal member 11 having a thin plate thickness on the front sheet metal portion 11a are deformed to absorb the load from the leg L. . Thereafter, the rear-side sheet metal portion 11b and the buffer structure portion 9 of the sheet metal member 11 in the high rigidity area B on the rear side of the vehicle from the boundary K are deformed to absorb the load and support the lower end of the leg L. Furthermore, when the deformation of these portions is completed, the closed cross-section structure of the radiator support member 5 having the highest rigidity supports the lower end of the leg portion L, and the leg portion L is maintained in an oblique straight line shape. .

Therefore, in the bumper structure according to the embodiment of the present invention, when the pedestrian's leg L hits the lower part of the front bumper 4 of the vehicle front portion 1 at the time of collision with the vehicle, the resin bumper 10 and the sheet metal member 11 Since the thin sheet metal part 11a on the front side is deformed, and the sheet metal member 11 is then supported on the lower sheet metal part 11b and the radiator support member 5 which support the lower end of the leg part L, walking A person's leg L can be kept in an oblique straight line, a local load on the leg L can be avoided to reduce the burden on the pedestrian, and a load from the leg L can be efficiently absorbed. .
Moreover, in the bumper structure of this embodiment, since it is comprised integrally with the resin bumper 10 and the sheet metal member 11, there is no need to provide a clearance between them, and when the leg portion L hits the lower part of the front bumper 4 It is possible to start absorbing the load from the point of view, the load absorbing time can be sufficiently secured, and the load absorbing performance is excellent. In addition, since the sheet metal member 11 of the present embodiment is provided to extend to the positions where the apron side members 2 arranged on the left and right sides in the vehicle width direction are provided, in the conventional structure, the apron side member 2 is positioned in front of the vehicle. The impact load absorbing component that had to be provided is not necessary.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, the rear-side sheet metal portion 11b having the thick plate thickness of the sheet metal member 11 is provided over substantially the entire vehicle width direction of the front bumper 4, but as shown in FIG. The rear side sheet metal portion 11b having a large thickness (three in the modification) may be partially provided in the vehicle width direction of the front bumper 4 with an interval.
In the above-described embodiment, only the sheet metal member 11 extending toward the rear of the vehicle is attached to the radiator support member 5 of the vehicle body frame, but the resin bumper 10 extending toward the rear of the vehicle is provided with the sheet metal member 11. It may be attached to the radiator support member 5 together. Furthermore, in the bumper structure of the present invention, the resin bumper 10 and the sheet metal member 11 may be manufactured separately, and the sheet metal member 11 may be integrally bonded and attached to the lower back surface of the resin bumper 1. According to this bumper structure, it can be manufactured more easily than an integrally molded one.

1 Vehicle front 2 Apron side member 4 Front bumper 5 Radiator support member (body frame)
7 Upper panel 8 Lower panel 9 Buffer structure 10 Resin bumper 11 Sheet metal member 11a Front side sheet metal part 11b Rear side sheet metal part 12 Tailored blank part L Pedestrian leg

Claims

In the vehicle bumper structure in which a sheet metal member having a shape along the shape of the bumper is integrally joined to the lower part of the resin bumper.
The main part of the sheet metal member is covered by the resin bumper, and the resin bumper and the sheet metal member are extended toward the rear of the vehicle, and the resin bumper and the sheet metal member are extended toward the rear of the vehicle. Or a bumper structure for a vehicle, wherein only the sheet metal member is attached to a vehicle body frame.
2. The vehicle bumper structure according to claim 1, wherein a thickness of a rear side metal plate portion extending toward the rear of the vehicle among the metal plate members is set to be thicker than that of a front side metal plate portion.
A part of the sheet metal member is configured as a tailored blank part by joining the thin sheet metal front side sheet metal part and the sheet metal thick rear side sheet metal part, and at least the front sheet metal part and The vehicle bumper structure according to claim 2, wherein the tailored blank portion is covered with the resin bumper.
In the bumper structure of a vehicle in which a sheet metal member having a shape along the shape of the bumper is integrally bonded and attached to the lower back surface of the resin bumper,
Lower portions of the resin bumper and the sheet metal member extend toward the rear of the vehicle, the sheet metal member extending toward the rear of the vehicle is attached to a vehicle body frame, and of the sheet metal members, toward the vehicle rear. A bumper structure for a vehicle, wherein a thickness of the extending rear side metal plate portion is set to be thicker than that of the front side metal plate portion.
The part of the sheet metal member is configured as a tailored blank part by joining the thin sheet metal front side sheet metal part and the thick sheet metal rear side sheet metal part. The vehicle bumper structure described.
The front end of the buffer structure provided in the body frame is disposed at the same position as the boundary between the thin sheet metal front side sheet metal part and the thick sheet metal rear side sheet metal part when viewed from the side of the vehicle. The vehicle bumper structure according to any one of claims 2 to 5, wherein: