JP4447712B2 - Bumper beam structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bumper beam structure that is disposed on the back surface of a bumper skin, is horizontally mounted and fixed to an end portion of a vehicle body frame, and is suitable for mounting a fog lamp.
[0002]
[Prior art]
As this kind of bumper beam, which is disposed on the back surface of the bumper skin and is laid across and fixed to the end of the vehicle body frame, a rectangular box type as disclosed in Japanese Patent Laid-Open No. 5-85286, which is the first conventional technique. A box with an intermediate shaft for deformation control in the cross section, and a straight back plate facing each other in the same way as a U-shaped straight main beam, and bonded and fixed by spot welding etc. There exists what was comprised in the cross section of the shape, for example, what was disclosed by Japanese Utility Model Laid-Open No. 3-42453 which is a second conventional example. In this example, the bumper beam configured by opposing the main beam and the back plate extends to the corner portion. That is, it was arranged over the full width of the vehicle body.
[0003]
However, these bumper beams can effectively absorb the impact at the time of collision from the traveling direction of the vehicle due to the box shape of the cross section, but the bumper beam extends to the corner, that is, to the full width of the vehicle body. Therefore, the storage space for fog lamps arranged near the both ends of the bumper is usually limited.
For this reason, resin corner members are attached to both ends of a bumper reinforcement corresponding to a bumper beam, as disclosed in Japanese Patent Laid-Open No. 1-59762, which is a third conventional example, and fog lights are attached to the corner members. The one that formed the exterior parts storage chamber such as was also proposed.
[0004]
[Problems to be solved by the invention]
However, in such a conventional bumper beam, except for the second conventional example, in the first and third conventional examples, when an impact at the time of collision from the traveling direction of the vehicle acts. As the front and rear surfaces of the bumper beam are crushed, the upper and lower surfaces are deformed in a convex shape upward and downward, respectively, but their bending points are arbitrary, and the deformation of the bumper beam is not stable. For this reason, the shock absorption characteristics are unbalanced, which hinders the shock absorption design.
Moreover, in the third conventional example, the deformation of the bumper beam directly hits the resin corner members at both ends, and the exterior parts such as fog lamps housed in the corner members can be sufficiently protected. There wasn't.
Further, in the second conventional example, the bumper beam has a box-like shape in which a linear back plate is opposed to and joined by spot welding or the like in the same manner as a linear main beam having a U-shaped cross section. Due to the cross-sectional configuration, when an impact is applied, it is bent in the vertical direction at the spot joint between the main beam and the back plate having a relatively low strength, so that a relatively stable shock absorbing characteristic can be obtained. The arrangement of fog lamps and the like was restricted by the presence of the bumper beam arranged over the full width.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems of the conventional bumper beam, and to provide a bumper beam having stable shock absorption characteristics by enabling the placement and protection of exterior parts such as large fog lamps. And
[0006]
[Means for Solving the Problems]
Therefore the present invention is a laterally placed to be fixed bumper beam structure to the end of the arranged to the vehicle body frame on the rear surface of the bumper skin, said bumper beam, a center of which is arranged in the longitudinal direction of the vehicle body side vehicle width direction The bumper comprises a main beam having a shape that protrudes outward in the longitudinal direction of the vehicle body, and a substantially straight back plate that is fixed to the main beam and disposed on the vehicle body center side. A fog lamp storage bracket that projects outside the vehicle body frame is disposed at both ends of the beam, and a stay is disposed at the vehicle body longitudinal end of the vehicle body frame, and the bumper beam and the fog lamp storage bracket are disposed on the stay. It is characterized by being fixed . In the present invention, the fixing portion between the main beam and the upper wall portion and the lower wall portion of the U-shaped back plate is disposed on a line substantially perpendicular to the vehicle body longitudinal deformation line of the bumper beam. It is a feature. The present invention, the stay of the flat, substantially hat-shaped cross section in the vehicle longitudinal direction end portions of the front SL vehicle body frame is fixed through a bracket stay, interposed the bracket upper in Bimuroa and the fog lamp housing bracket to the stay Then, the bumper beam is fixed, and a bracket lower in the fog lamp housing bracket is fixed to a lower portion of the stay. The present invention is to place a top portion of the body frame and the upper surface portion of the bracket stay the front planar portion in substantially the same plane in the bracket upper, a bottom portion of the bracket stay and the bottom surface portion of the Bimuroa it is characterized in that it has placed a bottom surface portion of the body frame in substantially the same plane. The invention is also fixed the disposed above the bumper beam at both ends of the vehicle width direction of the upper frame bumper epidermis Ru fixed to the upper surface, the front planar portion of the front end the bracket upper of the upper frame is, in which the rear end portion of the upper frame, characterized in that it is fixed to the rear end portion of the bracket upper is for a means for these issues resolved.
[0007]
Embodiment
Embodiments of the bumper beam structure of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the bumper beam structure of the present invention, FIG. 1A is a left perspective view of the bumper beam structure, and FIG. 1B is a plane for explaining the shock absorbing behavior of the bumper beam. 2 is a cross-sectional view taken along line AA in FIG. 1A, FIG. 3 is a cross-sectional view taken along line BB in FIG. 1A, and FIG. 4 is an enlarged view of a fog lamp housing bracket.
The bumper beam structure of the present invention is disposed on the back surface of the resin bumper skin 15 shown in FIGS. 2 and 3, and as shown in FIGS. 1 (A) and 1 (B), in the vehicle body length direction. The bumper beam 1 that is horizontally mounted between the ends of the left and right vehicle body frames 14 and 14 via the stays 8 and 8 is fixed to the vehicle traveling direction side (in the illustrated example, applied to the front bumper). The bumper beam of the present invention can be applied to the rear bumper as well, and the central part in the vehicle body width direction is convex in the vehicle body advancement direction. the main beam 2 of the arc-shaped) in the illustrated example, consist of a back plate 3 which generally straight in shape of the deployed section co to the main beam 2 is fixed to the vehicle body center direction (backward), the Both bumper beams With arranging a fog lamp housing bracket projecting outwardly of the vehicle body frame part, said stay is disposed in the vehicle longitudinal direction end portion of the body frame, and fixing the bumper beam and the fog lamp housing bracket to the stay It is characterized by that.
[0008]
As is clear in FIG. 1B, the fixed portion between the main beam 2 and the back plate 3 is continuously joined in the length direction (vehicle body width direction) by an appropriate method such as spot welding.
With such a configuration, when an impact P from the vehicle body traveling direction (front) at the time of collision is applied as indicated by a white arrow, the main beam 2 tries to deform linearly, and both ends thereof receive a force such as F1. At the same time, the trailing edge of the arc-shaped main beam 2 receives a pulling force in the vehicle body side direction such as F2.
This is nothing but conversion into a force for pulling the back plate 3 bonded and fixed to the rear edge side of the main beam 2.
That is, at the time of a normal front collision, the convex portion at the center of the main beam 2 in the vehicle body width direction first collides with an obstacle. Therefore, a fog lamp 16 disposed later on both ends of the main beam 2 is described later. Etc. are not easily affected by impact.
In addition, the impact of the main beam 2 that is deformed by receiving an impact from the traveling direction exhibits a strong proof strength by passing the back plate 3 in the pulling direction, and accelerates the load startup to efficiently absorb the impact. It becomes possible to effectively protect exterior parts such as the fog lamps 16 disposed at both ends of the main beam 2.
[0009]
FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 (A). The main beam 2 is disposed on the rear inner side of the bumper skin 15 with a cushioning material 17 such as urethane, and a U-shaped cross section. The fixing portions 18A and 18B between the upper wall portion 3A and the lower wall portion 3B of the back plate 3 are arranged on a line L substantially orthogonal to the vehicle body traveling direction deformation line (P direction) of the bumper beam 1. . That is, by making the joint fixing portions 18A and 18B in the same position in the upper and lower directions, the main beam 2 and the back plate 3 can be easily stabilized as solid lines 2 ′ and 3 ′ with these upper and lower fixing portions as bending points. It is possible to deform and absorb shocks.
Note that an air intake port or the like for the engine room is disposed below the bumper skin 15 in FIG.
[0010]
As shown in FIGS. 1A and 4, fog lamp storage brackets 4 that extend outside the vehicle body frame 14 (see FIGS. 1B and 3) are disposed at both ends of the bumper beam 1. To do.
With such a configuration, a large space is secured at both ends of the bumper beam 1, and even a relatively large exterior part such as a fog lamp 16 can be disposed. Moreover, the fog lamp storage bracket 4 is provided as described later. The structure is reinforced by stays 8 backed up by the body frame 14, and the outer parts such as the fog lamps 16 are reliably protected by the synergistic effect with the strong proof stress due to the passing of the back plate 3 in the pulling direction. Is done.
[0011]
As clearly shown in FIG. 1A, a stay 8 having a substantially hat-shaped cross section is attached to the end of the vehicle body frame 14 (not shown, see FIG. 3) via a bracket stay 11 (see FIG. 3). As shown in FIG. 3, the bumper beam 1 is fixed to the stay 8 via a beam lower 12 and a bracket upper 5 in the fog lamp storage bracket 4, and a bracket lower 6 in the fog lamp storage bracket 4 is fixed. The front flat portion 5C of the bracket upper 5, the upper surface portion 11A of the bracket stay 11 and the upper surface portion 14A of the vehicle body frame 14 are arranged in substantially the same plane, and the bottom surface of the beam lower 12 is fixed to the lower portion of the stay 8. The bottom portion 11B and the body frame 14 of the portion 12A, the bracket stay 11 Arranging the definitive bottom portion 14B in substantially the same plane.
[0012]
With such a configuration, the load when the main beam 2 is deformed by receiving an impact from the traveling direction is changed from the front flat surface portion 5C of the bracket upper 5 to the upper surface portion 11A of the bracket stay 11 to the upper surface portion 14A of the vehicle body frame 14. Is transmitted from the bottom surface portion 12A of the beam lower 12 to the bottom surface portion 14B of the vehicle body frame 14 through the bottom surface portion 11B of the bracket stay 11, so that the deformation stroke of the bumper beam is minimized and the fog lamp 16 or the like is transmitted. It becomes possible to protect the exterior parts more effectively.
[0013]
Further, as clearly shown in FIG. 4, the front end portion 13 </ b> C is disposed at the front of the bracket upper 5 at both ends in the vehicle body width direction of the upper frame 13 which is disposed on the bumper beam 1 and fixes the bumper skin 15 to the upper surface. The rear end portion 13A is fixed to the rear end portion 5A of the bracket upper 5 on the flat surface portion 5C.
With such a configuration, the bracket upper 5 that houses the exterior parts such as the fog lamp 16 is strongly reinforced by the both ends of the upper frame 13 and the deformation thereof is restrained.
[0014]
As described above, the embodiment of the present invention has been described. Within the scope of the present invention, the convex shape of the main beam and the cross-sectional shape thereof, the fixed form such as the joining with the back plate, the shape of the stay and the bracket stay, Form of connection between body frame and bumper beam via stay and bracket stay, form of body frame, installation form of beam lower to bumper beam, connection form of bumper beam and fog lamp storage bracket, shape of fog lamp storage bracket and the bracket The storage form of exterior parts such as fog lamps, the form of fixing the bumper skin to the bumper beam, the part where the bumper beam is disposed (can also be used for the rear bumper), etc. can be selected as appropriate.
[0015]
【The invention's effect】
Above As discussed with have in detail, the present invention is a laterally placed to be fixed bumper beam structure is disposed on the rear surface to the end portion of the body frame of the bumper skin, the bumper beam, arranged in the longitudinal direction of the vehicle body side A main beam having a central portion in the vehicle body width direction protruding outward in the vehicle front-rear direction, and a substantially straight back plate with a U-shaped cross section fixed to the main beam and disposed on the vehicle center direction side A fog lamp storage bracket that projects to the outside of the vehicle body frame at both ends of the bumper beam, and a stay is disposed at the vehicle body longitudinal end of the vehicle body frame, and the bumper is attached to the stay. by fixing the said fog lamp housing bracket and the beam, at the time of collision, since the convex portion of the central portion of the main beam strikes the first obstacle, before Impact of the main beam that deforms under impact from the direction performs better shock absorption efficiency and fast load startup with show strong strength by passing on to the tension of the back plate direction, both end portions of the main beam Thus, it is possible to effectively protect the exterior parts disposed on the housing. In addition, fog lamp storage brackets that extend outside the vehicle body frame are disposed at both ends of the bumper beam, so that even relatively large exterior parts such as fog lamps can be easily disposed and stored in the dedicated storage bracket. In addition, in the event of a collision, the convex part at the center of the main beam in the width direction of the main beam collides with an obstacle first, so that the fog lamp storage brackets located slightly behind both ends of the main beam Stored exterior parts such as fog lamps are less susceptible to impact and are effectively protected. In addition, the fog lamp storage bracket is reinforced by stays backed up by the body frame, and the exterior parts such as fog lamps are reliably protected by the synergistic effect with the powerful strength by the transfer of the back plate in the pulling direction described above. The
[0016]
Further, the main beam and the fixed portion of the upper wall portion and the lower wall portion of the U-shaped back plate are arranged on a line substantially perpendicular to the vehicle body longitudinal deformation line of the bumper beam. Since the main beam and the back plate can be reliably deformed and absorb shocks by using the upper and lower fixed portions arranged at the bending points, the design can be facilitated by stabilizing the shock absorption characteristics. .
[0017]
Furthermore, the vehicle body the stay of flat, substantially hat-shaped cross section in the longitudinal direction end portion of the body frame is fixed via a bracket stay, the bumper and interposed the bracket upper in Bimuroa and the fog lamp housing bracket to the stay By fixing the beam and fixing the bracket lower in the fog lamp storage bracket to the lower part of the stay, the fog lamp storage bracket is reinforced by a stay or the like backed up to the body frame, and the back plate is passed in the pulling direction. The exterior parts such as fog lamps are surely protected by the synergistic effect with the strong proof stress.
[0018]
Further, with arranging the top portions in a substantially same plane in the vehicle body frame and the upper surface portion of the bracket stay the front planar portion of the bracket upper, the vehicle body frame and the bottom portion of the bracket stay and the bottom surface portion of the Bimuroa By arranging the bottom surface portion of the bumper in substantially the same plane, the load when the bumper beam is deformed due to the impact from the traveling direction is reliably transmitted to the vehicle body frame via the bracket upper, the beam lower and the bracket stay. Therefore, it becomes possible to further effectively protect exterior parts such as fog lamps by minimizing the deformation stroke of the bumper beam.
[0019]
Furthermore, the bumper beam is disposed above of the bumper skin is in the opposite end portions of the vehicle body width direction of the upper frame that will be fixed to the top surface, a front end portion of the upper frame is fixed to the front planar portion of the bracket upper, by the rear end of the upper frame is fixed to the rear end portion of the bracket upper, because the deformation is restrained bracket upper in fog housing bracket is strongly reinforced by both end portions of the upper frame, fog lamps, etc. The exterior parts are further effectively protected.
As described above, according to the present invention, it is possible to provide a bumper beam having a stable shock absorbing characteristic by enabling the disposition and protection of an exterior part such as a large fog lamp.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a bumper beam structure according to the present invention, FIG. 1 (A) is a left perspective view of the bumper beam structure, and FIG. is there.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
3 is a cross-sectional view taken along the line BB in FIG. 1 (A). FIG.
FIG. 4 is an enlarged view of the fog lamp storage bracket portion.
[Explanation of symbols]
1 Bumper beam 2 Main beam 3 Back plate 4 Fog lamp storage bracket 5 Bracket upper 6 Bracket lower 7 Bracket side 8 Stay 9 Stay front 10 Stay rear 11 Bracket stay 12 Beam lower 13 Upper frame 14 Body frame 15 Bumper skin 16 Fog lamp 17 Buffer (urethane) etc)
18 Fixed part

Claims (5)

In laterally placed to be fixed bumper beam structure to the end of the arranged to the vehicle body frame on the rear surface of the bumper skin, the bumper beam, the central portion is the longitudinal direction of the vehicle body outside the arranged in the longitudinal direction of the vehicle body side vehicle width direction the main beam of the shape which is convex towards, and constituted by a substantially straight back plate-shaped cross-section graphics arranged in a vehicle body center direction side is fixed to the main beam, the both ends of the bumper beam A fog lamp storage bracket that protrudes to the outside of the vehicle body frame is disposed, a stay is disposed at the vehicle body longitudinal end of the vehicle body frame, and the bumper beam and the fog lamp storage bracket are fixed to the stay. Bumper beam structure. The main beam and a fixing portion between an upper wall portion and a lower wall portion of a U-shaped back plate having a U-shaped cross section are arranged on a line substantially orthogonal to a vehicle body longitudinal deformation line of the bumper beam. The bumper beam structure according to 1. Is fixed the vehicle body the stay of flat, substantially hat-shaped cross section in the longitudinal direction end portion of the body frame through the bracket stay, secure the bumper beam interposed the bracket upper in Bimuroa and the fog lamp housing bracket to the stay The bumper beam structure according to claim 1, wherein a bracket lower in the fog lamp housing bracket is fixed to a lower portion of the stay. With arranging the top portions in a substantially same plane in the vehicle body frame and the upper surface portion in the bracket stay the front planar portion of the bracket upper, bottom of the body frame and the bottom portion of the bracket stay and the bottom surface portion of the Bimuroa The bumper beam structure according to claim 3, wherein the portion is disposed in substantially the same plane. Wherein at both ends of the vehicle width direction of the upper frame is disposed above the bumper beam bumper epidermis Ru fixed to the upper surface, a front end portion of the upper frame is fixed to the front planar portion of the bracket upper, the upper frame The bumper beam structure according to claim 3 or 4 , wherein a rear end portion is fixed to a rear end portion of the bracket upper.

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