JPH0472738B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a mounting structure for mounting an automobile bumper to a vehicle body.

Prior Art A conventional bumper mounting structure of this type is shown in FIG. 6, for example.

The bumper in this figure is, for example, front bumper 1.
The bumper 1 is composed of a bumper reinforcement 2 made of a steel plate and a bumper face made of resin (not shown), and is supported by a front side member 4 as a strength member on the vehicle body side via a stay 3. Specifically, one end 3a of this stay 3 is inserted through the tip opening 4a of the front side member 4 and is screwed with a bolt (not shown);
The other end 3b of the stay 3 is the bumper reinforcement 2
The front bumper 1 is supported by the vehicle body by being welded to the front bumper 1.

By the way, in the event of a frontal collision of a vehicle, the load acting on the front bumper 1 is input to the front side member 4 extending in the longitudinal direction of the vehicle via the bumper reinforcement 2, and the front side member 4 collapses, thereby absorbing the impact. It will be done.

In addition, as another example of this type, there is also one described in, for example, Japanese Utility Model Application Publication No. 60-69755.

Problems to be Solved by the Invention However, in such a conventional bumper mounting structure, the stay 3 was used to support the front bumper 1, which resulted in an increase in the number of parts and the need for the stay 3. One end 3a is screwed to the front side member 4, but since this screwing position is located inside the vehicle, other parts get in the way and the screwing work is troublesome. Since the stay 3 is screwed to the stay 4, the surface rigidity of this part is improved and it is difficult to collapse, so there is a problem that the cushioning performance in the event of a vehicle collision is poor.

Means for Solving the Problems In order to solve the problems, the present invention provides a bumper mounting structure for an automobile in which a bumper reinforcement extending in the vehicle width direction is attached to a pair of side members extending in the longitudinal direction of the vehicle. The side member is formed into a hat-shaped cross section with a U-shaped cross section on the side of the vehicle body, and has flange portions extending in the vertical direction at upper and lower ends thereof, and an extension end protruding outward from the vehicle body body has a U-shaped cross section. The bumper reinforcement is formed into a U-shape and has a closed cross-section structure with a closing plate attached to the flange portion, while the bumper reinforcement has a closed cross-section structure with a rain force outer and a rain force inner. , an opening is provided at an intermediate portion of the rainforth inner in the vehicle width direction, a bracket is provided in a closed cross section inside the opening, and the extended end of the side member is closed through the opening. The present invention is characterized by an automobile bumper mounting structure in which the bumper is inserted into the cross section and fixed to the bracket with bolts.

Effect: According to this method, the extended end of the side member extending to the outside of the vehicle performs the function of a conventional stay, so this stay can be eliminated and the number of parts can be reduced. . In addition, the side member extension end is screwed to the bumper reinforcement to support the bumper, and since the screwing position is located on the outside of the vehicle, the workability of screwing is improved compared to before. Become. moreover,
In the event of a vehicle collision, an impact load is input to the side member via the bumper reinforcement, and the impact is buffered by crushing the side member.
In this case, since the side members are longer than before, the amount of collapse can be increased, resulting in improved shock absorption. Furthermore, the extension end of the side member, which forms a closed cross section by fixing the closing plate to the flange portion having a hat-shaped cross section, is inserted into the closed cross section of the bumper reinforcement through the opening of the reinforcement inner. Therefore, the bumper reinforcement can be integrally formed to extend from the side member to the end side in the vehicle width direction. in this case,
The extension end is formed in a U-shape and does not have a flange like the other parts, so it can be easily inserted into the opening and the opening can be made smaller. Even if an opening is formed, it will not be lowered that much. In addition, a bracket is provided within the closed section of the bumper reinforcement, and the extended end of the side member inserted through the opening is fixed to this bracket. This will improve the strength of the steel.

Example Hereinafter, the present invention will be explained based on examples.

1 to 3 are diagrams showing a first embodiment of the present invention.

First, to explain the structure, reference numeral 11 in the figure is, for example, a front bumper, and this bumper 11 is composed of a bumper face 12 and a bumper reinforcement 13 made of synthetic resin. directly supported.

Specifically, the bumper reinforcement 13 is composed of a reinforcement outer 15 and a reinforcement inner 16, which have upper flange parts 15a, 16a and lower flange parts 15b,
16b are each spot welded to form a closed cross section. The reinforcement inner 16 has a pair of openings 16c into which the front side members 14 are inserted, not at both ends in the vehicle width direction but at an intermediate portion. A bracket 17 is disposed within the closed section of the portion corresponding to the opening 16c. This bracket 17 is formed into a substantially rectangular shape by joining an upper part 17b to a lower part 17a which is roughly U-shaped, and an inboard flange part 17c of the lower part 17a and an inboard flange part 17d of the upper part 17b are in a rain-like shape. It is spot welded to the force inner 16. Further, an outer side flange portion 17e of the lower portion 17a is welded to the reinforcement outer 15.

On the other hand, the front side member 14 is extended toward the front of the vehicle from the radiator core support 18 that forms the vehicle body at the front of the vehicle, and has insertion holes in the upper and lower surfaces 14b and 14c of the extended extension end 14a, respectively. 14d and 14e are bored. Further, on the vehicle body side of the front side member 14, flange portions 14f, 14g are formed along the vertical direction at the upper and lower ends of the U-shaped cross section, and are formed into a hat-shaped cross section.
A closing plate 19 is spot welded to 4g to form a closed cross section. This flange part 1
4f and 14g are discontinued in the middle because the extension end 14a is inserted through the opening 16c of the bumper reinforcement 13, and the extension end 14a is formed in a U-shape in cross section. There is. Further, the extension end 14a includes an extension 2.
0 is placed. This extension 20
are the upper plate part 21a and the lower plate part 2 of the U-shaped plate 21.
A cylindrical collar 22 is disposed between the upper and lower plate portions 21a and 21b, and holes 21c and 21d communicating with the hollow portion of the collar 22 are bored in the upper and lower plate portions 21a and 21b. A through hole 20a passing through the extension 20 is formed in the vertical direction in the holes 21c, 21d and the hollow portion of the collar 22. moreover,
By disposing the extension 20 within the cross section of the extension end 14a of the front side member 14, the through hole 20a of the extension 20
and the insertion holes 14d, 1 of the front side member 14.
It is also connected to 4e.

The extension end 14a of the front side member 14 where this extension 20 is disposed
is inserted into the closed section of the bumper reinforcement 13 from the opening 16c of the reinforcement inner 16 and secured with screws. Specifically, the extension end 14a of the front side member 14 is inserted into the bracket 17, and is inserted through the insertion hole 20a of the extension 20 and the insertion hole 1 of the bracket bottom 17f.
7g etc. from below, and is screwed into a weld nut 17h fixed to the upper part 17b of this bracket 17.

Further, as shown in FIG. 1, the bumper face 12 has a notch 12a formed in its lower part for attaching a bolt 23.

Next, the operation of the automobile bumper mounting structure constructed as described above will be explained.

When a vehicle has a frontal collision, an impact load is input to the bumper reinforcement 13 of the front bumper 11 and transmitted to the front side member 14. Then, this front side member 14 is crushed and the impact is absorbed. Unlike the conventional front side member 14, this front side member 14 is extended toward the front of the vehicle and has a longer overall length than the conventional one, so that the shock absorption performance is improved. Further, the bracket 17 is disposed within the closed cross section of the bumper reinforcement 13, and the extended end portion 14 of the front side member 14 is disposed within the closed cross section of the bumper reinforcement 13.
By disposing the extension 20 at point a, the rigidity of this portion is improved.

In addition, in order to install such a front bumper 11, it is only necessary to screw it to the extension end 14a of the front side member 14 that protrudes forward from the radiator core support 18 of the vehicle body, and one end of the stay 3 as in the conventional case. Since there is no need to screw the portion 3a, that is, the portion on the inside of the vehicle, other members do not get in the way, and installation and removal operations can be easily performed.

Furthermore, since the extended end 14a of the front side member 14 also serves as the conventional stay 3, the number of parts can be reduced.

On the other hand, FIGS. 4 and 5 show a second embodiment of the present invention.

In this embodiment, a front bracket 37 and a side bracket 38 are welded and fixed to the tip opening and side opening of the extended end 34a of the front side member 34. Moreover, this extension end 34a
A pair of collars 39 are welded to both sides of the collar 39, and a through hole 39a for the bolt 23 is formed in the collar 39.

On the other hand, the bumper reinforcement 33 includes a reinforcement outer 35 and a reinforcement inner 3.
6 forms a closed cross section. The rain force inner 36 has a generally rectangular opening 36a large enough to allow the extension end 34a to pass through.
has been established. This rain force inner 3
A pair of insertion holes 36d are bored in the lower surface portion 36c of the collar 39 at positions corresponding to the through holes 39a of the collar 39. Further, a bracket 40 is disposed in this opening 36a. This bracket 40 has a recess 4 into which the extension end 34a is inserted.
0a is formed, and this recess 40a is the opening 3.
A flange portion 40c is welded to the peripheral edge of the opening 36a. Further, this bracket 40 has an insertion hole 40b formed at a position corresponding to the insertion hole 36d of the rain force inner 36, and a weld nut 40d is fixed to the upper part.

Furthermore, a pair of buff-full plates 42 are disposed within the closed cross section of the bumper reinforcement 33. Specifically, the recess 40a of the bracket 40 is fitted into the notch 42a formed on one side of the buff-full plate 42, while the flange 42 formed on the other side of the buff-full plate 42 is fitted.
b is welded to the reinforcement outer 35.

After the extension end 34a of the front side member 34 to which the collar 39 is fixed is inserted into the recess 40a of the bracket 40, the pair of bolts 23 are inserted through the two notches 32a of the bumper face 32. is passed through the extended end 34a, the reinforcement inner 36 and the bracket 40, and is screwed into the weld nut 40d.

In this way, the front side member extension end 34a is attached to the bumper reinforcement 33 at two locations, so the bumper reinforcement 33
When an impact is applied to the center of the vehicle from the front of the vehicle,
When compared with that of the first embodiment, the strength of this bumper reinforcement 33 is improved. That is, when considering the bumper reinforcements 13 and 33 as beams, the one in the first embodiment can be a beam supported at both ends, and the one in the second embodiment can be a beam fixed at both ends.
Unlike a beam supported at both ends, when a beam is fixed at both ends, a bending moment acts on the fixed end, that is, at the connection between the bumper reinforcement 33 and the front side member extension end 34a.
As a result, the maximum bending moment acting on the bumper reinforcement 3 is reduced compared to the first embodiment.
The strength of No. 3 will be improved.

The other configurations and operations are the same as those in the first embodiment, so their explanations will be omitted.

In each of the embodiments described above, the present invention is applied to the front bumpers 11 and 31, but the present invention is not limited thereto and can of course be applied to a rear bumper. Further, in each of the above embodiments, the bumper reinforcements 13, 33
Although the description has been given of a case with a closed cross section, it can also be applied to a case with an open cross section, such as a U-shaped cross section. In this case, the side member extension end is inserted into the U-shape.

Effects of the invention As explained above, according to this invention,
By extending the side members, the crushing margin can be made longer than that of the conventional side members, so that shock absorption can be improved. In addition, since the extension end of the side member located on the outside of the vehicle can be screwed to the bumper reinforcement, it is easier to install because other parts do not get in the way compared to screwing the part on the inside of the vehicle. can be improved. Furthermore, since the extended end of the side member can also serve as a conventional stay, the number of parts can be reduced. Furthermore, the extension end of the side member, which forms a closed cross section by fixing the closing plate to the flange portion having a hat-shaped cross section, is inserted into the closed cross section of the bumper reinforcement through the opening of the reinforcement inner. Therefore, the bumper reinforcement can be integrally formed to extend from the side member to the end side in the vehicle width direction. In this case, the extension end is formed in a U-shape and does not have a flange like other parts, so it is easy to insert into the opening and the opening can be made small, so the bumper reinforcement Forming this opening does not significantly reduce the rigidity. Additionally, a bracket is disposed within the closed section of the bumper reinforcement, and the extended end of the side member inserted through the opening is fixed to this bracket.
This bracket has a practically beneficial effect of improving the strength of the side member attachment site.

[Brief explanation of the drawing]

1 to 3 are diagrams showing a first embodiment of the automobile bumper mounting structure of the present invention, in which FIG. 1 is a cross-sectional view along the longitudinal direction of the vehicle, FIG. 2 is an exploded perspective view of the same structure, and FIG. Figure 3 is a perspective view showing the bumper reinforcement and front side member in an exploded state;
4 and 5 are diagrams showing a second embodiment of the present invention, and FIG. 4 is an exploded perspective view corresponding to FIG.
FIG. 5 is a sectional view corresponding to FIG. 1, and FIG. 6 is an exploded perspective view showing a conventional example. 11, 31...Front bumper (bumper), 1
3, 33... Bumper reinforcement, 14, 34
...Front side member (side member), 1
4a, 34a... extension end, 23... bolt.

Claims (1)

[Claims] 1. A pair of side members along the longitudinal direction of the vehicle,
An automobile bumper mounting structure is provided for mounting a bumper reinforcement along the vehicle width direction, wherein the side member has a U-shaped cross section on the side of the vehicle body and has a flange portion extending in the vertical direction at the upper and lower ends thereof. The extension end protrudes outward from the vehicle body and has a U-shaped cross section;
A closing plate is attached to the side member to form a closed cross-section structure, while the bumper reinforcement is formed to have a closed cross-section by a rain force outer and a rain force inner, and the bumper reinforcement is formed by a rain force outer and a rain force inner. An opening is opened at an intermediate portion in the vehicle width direction, a bracket is provided in the closed section inside the opening, and the extended end of the side member is inserted into the closed section through the opening, An automobile bumper mounting structure, characterized in that it is fixed to the bracket with bolts.