JP4176207B2 - Front bumper mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a front bumper mounting structure having a vehicle body front structure in which a radiator panel upper and a cross member lower are coupled by a stay.
[0002]
[Prior art]
Generally, a bumper made of metal or resin is attached to the front or rear of the vehicle body to absorb the impact at the time of a light collision of an automobile. Conventionally, various types of front bumper mounting structures in automobiles have been adopted, and those disclosed in Japanese Utility Model Publication No. 1-1171759 shown in FIG. 4 are known as typical ones. Yes. This is because the upper end of the bumper 21 is fixed to the vehicle body 22 at a position above the cross member 24 by the fixture 38, and an engaging portion that is detachable from the cross member 24 is provided at the lower back side of the bumper 21. The engaging portion is engaged with the cross member 24.
[0003]
However, in recent years, a front bumper in which a bumper part and a grill part are integrally formed has been adopted for a small vehicle such as a light vehicle from the viewpoint of reducing the number of parts and improving the assembling performance. .
One example is shown in FIG. This is because the front bumper is long in the vertical direction when the radiator panel upper 3 and the cross member lower 4 are joined by the stay 5 so that the front bumper is long in the vertical direction. The front bumper formed by integrally molding the upper part, the lower part and the intermediate part are coupled to the front structure of the vehicle body.
The upper end portion of the front bumper is connected to the radiator panel upper 3 by mounting bolts (not shown), the intermediate portion of the front bumper is connected to the intermediate portion of the stay 5 by mounting bolts 28 and the like, and the lower end portion of the front bumper is attached to mounting bolts and the like 29 is coupled to the cross member lower 4. Reference numeral 6 denotes a radiator disposed at the rear portion of the stay 5.
[0004]
[Problems to be solved by the invention]
However, in the conventional front bumper mounting structure in which the bumper portion and the grill portion are integrally formed, the front bumper is long in the vertical direction. Therefore, as described above, the intermediate portion of the front bumper is attached to the mounting bolt 28 or the like. In a vehicle with a structure that does not have an extra crash space in the front part of the vehicle body, such as a light vehicle, the impact applied to the front bumper is also caused by a slight frontal collision. Before the front bumper is destroyed, the energy affects the interior parts in the engine room such as the radiator 6 through the stay 5 from the mounting portion by the mounting bolt 28 or the like in the intermediate portion, and may damage at the early point of the collision. There was this.
[0005]
Therefore, the present invention solves the problems in the conventional bumper mounting structure in which the conventional bumper part and grill part are integrally formed, and minimizes the number of damaged parts including the interior parts in the engine room during a light collision. In addition, an object of the present invention is to provide a front bumper mounting structure configured to stably absorb excess collision energy to the vehicle body side.
[0006]
[Means for Solving the Problems]
For this reason, in the present invention, in the front bumper mounting structure having the front body structure in which the radiator panel upper and the cross member lower are coupled by the stay, the upper end portion of the front bumper formed integrally with the bumper portion and the grill portion is provided as described above. It is characterized in that it is coupled to the radiator panel upper and the lower end portion is coupled to the cross member lower, and a predetermined space is provided between the front bumper intermediate inner wall and the stay.
Further, the present invention is characterized in that the connecting portions to the vehicle body at the upper and lower end portions of the front bumper are arranged on substantially the same plane substantially orthogonal to the vehicle traveling axis.
Further, according to the present invention, the upper end of the front bumper is connected to the radiator panel upper by an upper fixture parallel to the vehicle traveling axis, and the lower bumper of the front bumper is connected to the cross member lower from the lower part of the vehicle. It is characterized in that it is configured to be performed by a tool.
Further, the present invention is characterized in that the connecting portion to the vehicle body at the upper and lower ends of the front bumper is a secondary energy absorbing structure that is joined to the front bumper, and these are means for solving the problems. To do.
[0007]
Embodiment
Hereinafter, an embodiment of a front bumper mounting structure according to the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of a front bumper mounting structure according to the present invention. FIG. 1 is an exploded perspective view showing a mounting state of the front bumper to the vehicle body front structure, and FIG. FIG. 3 is a cross-sectional view of a part A in FIG.
As shown in FIG. 1, the front bumper mounting structure of the present invention has a bumper portion 1 </ b> A with respect to a vehicle body front portion structure in which a center portion of a radiator panel upper 3 and a center portion of a cross member lower 4 are coupled by a stay 5. The upper end portion of the front bumper 1 formed integrally with the upper grill portion 1B is coupled to the radiator panel upper 3 by an upper mounting tool 8 such as a mounting bolt, and the lower end portion is connected to the cross member lower 4 by a grommet or the like. The lower fitting 9 is used, and a predetermined interval is provided between the intermediate inner wall of the front bumper 1 and the stay 5. Reference numeral 7 denotes a fender panel to which the upper rear end of the front bumper 1 is coupled.
Note that the bumper portion 1A and the grill portion 1B that are integrally molded include those that are molded in advance integrally, and those that are molded by mounting the grill portion 1B on the bumper portion 1A that is molded separately.
[0008]
FIG. 2 is a cross-sectional view of the center of the vehicle body at B portion in FIG.
As shown in FIG. 1, the upper end portion of the grill portion 1B is formed with a notch opening portion for installation such as an open / close lever of a bonnet (not shown). Absent. Therefore, a state in which the lower end portion of the bumper portion 1A of the front bumper 1 is coupled to the cross member lower 4 by the lower fitting 9 such as a grommet is shown.
A predetermined gap is provided between the intermediate inner wall of the front bumper 1 and the stay 5. That is, the cross-sectional shape of the front bumper 1 is configured as a hat shape that is convex forward of the vehicle traveling axis. Reference numeral 6 denotes a radiator that is one of the engine room interior components arranged at the rear of the stay 5.
[0009]
FIG. 3 is a cross-sectional view of a portion A in FIG. 1 and shows a state in which both side portions of the notch opening in the grill portion 1B of the front bumper 1 are joined by an upper fixture 8 such as a mounting bolt.
With respect to the joints of the upper and lower ends of the front bumper 1 to the vehicle body front structure, the upper end of the front bumper 1 is joined to the radiator panel upper 3 by an upper fixture 8 such as a mounting bolt in parallel with the vehicle traveling axis. The front bumper 1 is coupled to the cross member lower 4 at the lower end of the front bumper 1 by a lower fixture 9 such as a grommet from below the vehicle.
These connecting portions to the vehicle body at the upper and lower end portions of the front bumper 1 are arranged on substantially the same plane substantially orthogonal to the vehicle traveling axis.
[0010]
Further, these coupling portions are characterized by having a secondary energy absorption structure that is joined to the front bumper 1. That is, the collision energy at the time of a frontal collision is first absorbed to the limit of material characteristics and modeling by a convex shape in front of the front bumper 1, and then attached to the lower end portion of the front bumper 1 such as a grommet from below the vehicle. The tool 9 absorbs the impact by shear fracture.
Thereafter, the impact energy that could not be absorbed is stably transferred to the vehicle body front structure by the upper fixture 8 such as a mounting bolt in parallel with the vehicle traveling axis at the upper end of the front bumper 1.
[0011]
Although the embodiments of the present invention have been described above, the shape and material of the front bumper including the bumper portion and the grill portion within the scope of the present invention, the form of the front bumper coupled to the radiator panel upper and the cross member lower The type of fixture and the like can be selected as appropriate.
[0012]
【The invention's effect】
As described above in detail, according to the present invention, in the front bumper mounting structure having the vehicle body front structure in which the radiator panel upper and the cross member lower are coupled by the stay, the bumper portion and the grill portion are integrally molded. The upper end of the bumper is connected to the radiator panel upper, the lower end is connected to the cross member lower, and a predetermined distance is provided between the intermediate inner wall of the front bumper and the stay, so that the grill part is integrated with the bumper part. It is possible to consolidate the joint part of the front bumper to the car body on the upper and lower structure members such as the radiator panel upper and cross member lower in a form straddling the opening in the car body front structure on the front of the radiator. In the initial stage of shock absorption due to the frontal collision, the strength and rigidity are ensured by the cross-sectional shape of the front bumper. To demonstrate, are effectively shock absorption by deformation of the elastic region, it is possible to minimize the damaging the engine intracameral components such as a radiator.
[0013]
Further, the vehicle bumper connecting portion to the vehicle body at the upper and lower end portions of the front bumper is disposed on substantially the same plane substantially orthogonal to the vehicle traveling axis, and the connection to the radiator panel upper portion at the upper end portion of the front bumper is the vehicle. The upper bumper is parallel to the traveling axis, and the lower bumper's lower end is connected to the cross member lower by the lower bracket from the bottom of the vehicle. In this case, the front bumper does not exhibit a moment behavior that causes the vehicle body to jump up and moves substantially parallel to the vehicle traveling axis, so that the impact load is concentrated on the joint at the upper end of the front bumper. Upper fixture that breaks the front bumper and is connected in parallel to the vehicle travel axis without the mounting bolts etc. at the upper end falling off Against the background of the reliable fastening of the connecting part, it is ensured to start from the tearing or dropping off of the lower fitting 9 such as the grommet at the lower end of the front bumper 1 to minimize damage to surrounding parts Enable.
[0014]
Further, the front bumper has a secondary energy absorption structure at the upper and lower ends of the front bumper, so that when the front bumper exceeds the limit of energy absorption, the front bumper The fixture at the coupling portion is effectively destroyed, and the absorption of excess collision energy can be taken over to the vehicle body front structure.
As described above, according to the present invention, the number of damaged parts at the time of a light collision is minimized including the interior parts in the engine room, and absorption of excess collision energy can be stably converted to the vehicle body side. An improved front bumper mounting structure is provided.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a front bumper mounting structure according to the present invention, and is an exploded perspective view showing a mounting state of a front bumper to a vehicle body front structure.
FIG. 2 is a cross-sectional view of the center of the vehicle body at B part in FIG. 1, showing an embodiment of a front bumper mounting structure of the present invention.
FIG. 3 is a cross-sectional view of a portion A in FIG. 1, showing an embodiment of a front bumper mounting structure of the present invention.
FIG. 4 is an exploded perspective view showing a general front bumper mounting structure.
FIG. 5 is a cross-sectional view showing a conventional example of a front bumper mounting structure in which a bumper portion and a grill portion are integrally formed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front bumper 1A Bumper part 1B Grill part 3 Radiator panel upper 4 Cross member lower 5 Stay 6 Radiator 7 Fender panel 8 Upper fixture (Mounting bolt)
9 Lower fitting (Grommet)

Claims (4)

In a front bumper mounting structure having a front body structure in which a radiator panel upper and a cross member lower are coupled by a stay, an upper end portion of a front bumper formed by integrally molding a bumper portion and a grill portion is coupled to the radiator panel upper portion. A front bumper mounting structure, wherein a lower end portion is coupled to the cross member lower, and a predetermined gap is provided between a front bumper intermediate inner wall and a stay. The front bumper mounting structure according to claim 1, wherein the connecting portions to the vehicle body at the upper and lower ends of the front bumper are arranged on substantially the same plane substantially orthogonal to the vehicle traveling axis. The upper end of the front bumper is connected to the radiator panel upper by an upper fixture parallel to the vehicle traveling axis, and the lower bumper of the front bumper is connected to the cross member lower by a lower fixture from the lower side of the vehicle. The front bumper mounting structure according to claim 1, wherein the front bumper mounting structure is configured. The front bumper mounting structure according to any one of claims 1 to 3, wherein a joint portion to the vehicle body at the upper and lower ends of the front bumper is a secondary energy absorbing structure that is joined to the front bumper.

Images