JPH10250505A - Body bumper mounting part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body bumper mounting part structure which can withstand the pulling force of a bumper at the time of off-set collision while an increase in welding length and an increase in weight increment at its joining part are being restrained. SOLUTION: Bumper brackets 4 and 5 for fixing a bumper 3, which are provided with fitting-in parts 4a and 5a for holding the vertical walls of the front end part of a side member 2 with joining flanges 4a and 5c to the side member 2 and for an example, bumper fixing nuts 4d and 5d and the like, are surely joined with the outer surfaces of the vertical walls of the side member 2 by welding and the like, and a locking part 6 is also provided, which transmits an input to the bumper bracket 5 that is mounted on the side member 2 at the outer side of a vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for mounting a bumper to a side member at an end of a vehicle body.

[0002]

2. Description of the Related Art As a conventional structure for mounting a vehicle body bumper, there has been a structure shown in FIGS. 9 to 11 as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-79250. In this prior art, as shown in FIG. 9, a bead and a projection are formed so as to fit on both side surfaces of a side member 102 and a welding surface of a bumper bracket 104.

[0003] As shown in FIG. 10, when an offset collision of a vehicle 109 occurs, the side member 102 on the opposite side is crushed by the side member 108 on the collision side.
It is also desired to provide a function of dispersing the energy and sharing the energy absorption and suppressing the deformation of the side member 108 on the collision side.

[0004]

However, in the disclosed conventional bumper mounting portion structure, as shown in FIG. 11, the deformation of the bumper bracket 104 and the deformation of the side Due to the cross-sectional deformation of the member 102a, the opposite side member 10
Energy absorption due to the dispersion of the force to 2 is small.

Therefore, in order to support the pulling force F of the bumper 103, the bumper bracket 104
In order to suppress the deformation of the bumper bracket 104, the thickness of the bumper bracket 104 is increased or the welding length with the side member 102 is increased. Further, in order to suppress the cross-sectional deformation of the side member 102, the thickness of the side member 102 itself is increased.
Further, when energy absorption of the side member 102 on the collision side cannot be expected, it is conceivable to increase the thickness of the side member 108 on the collision side. In these cases, the number of work steps increases and the weight increases.

The present invention has been made in view of such a conventional problem, and includes a bumper bracket provided with a fitting portion for sandwiching a vertical wall at the front end of a side member, and a vehicle exterior mounted on the side member. By providing the engaging portion for transmitting the input to the bumper bracket to the vehicle inner bumper bracket, it is possible to hold the pulling force of the bumper at the time of the offset collision while suppressing the welding length and the weight increase of the connecting portion.

[0007]

According to a first aspect of the present invention, there is provided a bumper mounting structure of a vehicle body, wherein a bumper bracket provided with a fitting portion for sandwiching a vertical wall at a front end of a side member, and the vehicle mounted to a side member. An engaging portion for transmitting an input to the outer bumper bracket to the inner bumper bracket is provided.

The second invention has a structure in which one of the fitting portions sandwiching the side member vertical wall abuts the end of the vehicle outer bumper bracket against the inner surface of the side member vehicle inner vertical wall.

In the third invention, the fitting portion and the mounting portion of the bumper are formed integrally with the bumper bracket by using a light alloy extruded material or the like.

According to a fourth aspect of the present invention, in a vehicle body in which a bumper is assembled to a side member via a radial core support, a protrusion is provided on a part of the radial core support so as to be inserted into a cross section of a front end of the side member. A joint is formed.

[0011] vehicle bumper mounting portion structure of the first invention, the tensile force F of the bumper in an offset collision, distributed pressing force f _a to the side member vehicle interior vertical wall in the vehicle inner side bracket nut portion, the bumper bracket Deformation is suppressed. In addition, the cross-sectional deformation of the front end of the side member is suppressed by the vehicle outer bracket engaging portion and the vehicle inner bracket. Therefore, while suppressing the increase in the welding length and weight of the bumper bracket with the side member, the force is dispersed to the opposite side member due to the side member crushing on the collision side at the time of an offset collision, and energy absorption is shared, and the collision side on the collision side is The amount of deformation of the side member can be suppressed.

The second and subsequent inventions have the following operation in addition to the first invention. The vehicle body bumper mounting portion structure according to the second invention has a structure in which one of the fitting portions sandwiching the side member vertical wall abuts the end of the vehicle outer bumper bracket on the inner surface of the side member vehicle inner vertical wall. Therefore, since the engaging portion is formed integrally, the cross-sectional deformation of the front end of the side member can be more reliably suppressed.

In the vehicle body bumper mounting portion structure according to the third invention, the fitting portion and the bumper mounting portion are formed integrally with the bumper bracket by using a light alloy extruded material or the like. Therefore, the number of parts can be reduced, and the man-hour for assembling to the side members can be reduced.

In the vehicle body bumper mounting portion structure according to a fourth aspect of the present invention, a protrusion is provided on a part of the radial core support so as to be inserted into a cross section of the front end of the side member to form a fitting portion. Therefore, the same effect can be obtained in a general bumper bracket structure having a bumper mounting flange from the side member toward both sides.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle body bumper mounting structure according to an embodiment of the present invention.

(First Embodiment) A first embodiment of a vehicle body bumper mounting portion structure according to the present invention will be described with reference to FIGS. 1 is a perspective view showing the structure of the bumper mounting portion viewed from diagonally forward of the vehicle body, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is an operation diagram of the bumper mounting portion (same cross-sectional view as FIG. 2). FIG. 4 is a block diagram showing the transmission of the force of the bumper mounting portion (collision side). First, the structure will be described. The vehicle body bumper mounting portion structure according to the first embodiment includes, as shown in FIGS. 1 and 2, a vehicle body side member 2 having a joining flange 4 to the side member 2.
c, 5c and a fitting portion 4 that sandwiches the front end vertical wall of the side member 2 with, for example, bumper fixing nuts 4d, 5d.
The bumper brackets 4 and 5 for fixing the bumper 3 provided with the a and 5a are securely joined to the outer surface of the vertical wall surface of the side member 2 by welding or the like, and an input to the vehicle outer bumper bracket 5 attached to the side member 2 is input to the vehicle. An engaging portion 6 for transmitting to the inner bumper bracket 4 is provided. It is needless to say that the vehicle body bumper mounting structure of the present invention can be applied not only to the front part of the vehicle body but also to the rear part of the vehicle body.

Next, the operation of the first embodiment will be described with reference to FIGS. As shown in FIG. 3, bumper brackets 4 and 5 provided with fitting portions for sandwiching the front end vertical wall of the side member 2, and inputs to the vehicle outer bumper bracket 5 attached to the side member 2 are input to the vehicle inner bumper bracket. 4 and a stop portion 6 for transmitting the force to the engaging portion 4.

[0018] Therefore, the bumper 3 in the offset collision.
As shown in FIGS. 3 and 4, the pulling force F of the vehicle inner bracket 4 is, via a bolt, → the shearing force f _A of the vehicle inner bracket 4 → the vehicle inner bracket nut portion 4d is formed by the side member 2 and the vehicle inner vertical. Pressing force f _a against wall
→ perform distributed to the bending moment f _aM of the side members 2 vehicle inside the vertical wall. In the vehicle outer bracket 5, a shear force f _B of the vehicle outer bracket 5 via a bolt → the vehicle inner bracket 4 pressing force f at the vehicle outer engaging portion 6.
_b1 → Side member 2 Pressing force f _a against vertical wall inside vehicle →
The side member 2 distributes the bending moment _{faM of the} vertical wall inside the vehicle. Further, a bolt, for distributed into tensile force f _b2 shear force f _B → side members 2 the vehicle outer vertical wall of the vehicle outer side bracket 5.

As described above, the bumper 3 is driven by the offset collision.
Pulling force F of, by pressing force f _a to side members 2 the vehicle inside vertical wall of the vehicle inside the bracket nut portion 4d, the deformation of the bumper bracket 4,5 is suppressed. In addition, the vehicle outer bracket 5 engaging portion 6 and the vehicle inner bracket 4 suppress the cross-sectional deformation of the front end of the side member 2.

Therefore, the bumper 3 causes the entire side member 2 to bend, so that the bumper brackets 4 and 5 are prevented from being welded to the side member 2 and increasing in weight, and the side member crush on the collision side during an offset collision is suppressed. Accordingly, the force is distributed to the opposite side member 2 to share the energy absorption, and the amount of deformation of the collision side member can be suppressed.

(Second Embodiment) A second embodiment of the vehicle body bumper mounting structure according to the present invention will be described with reference to FIG. FIG. 5A is a cross-sectional view of the bumper mounting portion (the same position cross-sectional view as FIG. 2), and FIG. 5B is a perspective view of the bumper bracket of the bumper mounting portion. As shown in FIG. 5, one of the fitting portions sandwiching the vertical wall of the side member 2 is formed as a fitting portion 15b by applying the end of the vehicle outer bumper bracket 15 to the inner surface of the vehicle inner vertical wall. In addition, the engaging portion 16 is also provided with the engaging portion 16 and the engagement portion 15 b is provided.
A connecting portion 14a between the vehicle outer bumper bracket 15 and the vehicle inner bumper bracket 14 is provided.

Next, the operation of the second embodiment will be described. The engaging portion 16 is a bumper bracket 15 outside the vehicle.
As a result, the side member 2 is integrally formed between the two vertical walls, so that the cross-sectional deformation of the front end of the side member can be more reliably suppressed.

(Third Embodiment) A third embodiment of the vehicle body bumper mounting portion structure according to the present invention will be described with reference to FIG. FIG. 6A is a cross-sectional view of a bumper mounting portion (a cross-sectional view at the same position as FIG. 2), and FIG. 6B is a perspective view of a bumper bracket of the bumper mounting portion. As shown in FIG. 6, the bumper bracket 24 is integrally formed with a fitting portion 24a and a bumper attachment portion 24b by using a light alloy extruded material or the like.

Next, the operation of the third embodiment will be described. Since the bumper bracket 24 is integrally formed, the number of parts can be reduced, and the number of steps for assembling the side member can be reduced.

(Fourth Embodiment) A fourth embodiment of the vehicle body bumper mounting structure according to the present invention will be described with reference to FIGS. FIG. 7 is a perspective view showing the structure of the bumper mounting portion viewed from diagonally forward of the vehicle body, and FIG. 8 is a sectional view taken along line BB of FIG. As shown in FIGS. 7 and 8, a projection 37 is provided on a part of the radial core support 7 so as to be inserted into a cross section of the front end of the side member 2, thereby forming a fitting portion 37 a.

Next, the operation of the fourth embodiment will be described. The protrusion 37 of the radial core support 7 is
Therefore, even in a general bumper bracket 34, 35 structure having bumper mounting flanges 34a, 35a from the side member 2 toward both sides,
The same effect can be obtained by securely fastening the bumper 3 and the radial core support 7.

[0027]

As described above in detail, the vehicle body bumper mounting portion structure of the first embodiment includes a bumper bracket provided with a fitting portion for sandwiching the front end vertical wall of the side member, and a side member. And an engaging portion for transmitting an input to the vehicle outer bumper bracket attached to the vehicle to the vehicle inner bumper bracket. distributed pressing force f _a to deformation of the bumper bracket is suppressed. In addition, the cross-sectional deformation of the front end of the side member is suppressed by the vehicle outer bracket engaging portion and the vehicle inner bracket. Therefore, while suppressing the welding length and weight increase of the bumper bracket with the side member, the force on the opposite side member due to the crushing of the side member on the collision side at the time of an offset collision is dispersed and energy absorption is shared. Of the side member can be suppressed.

The second and subsequent embodiments have the following advantages in addition to the first embodiment. In the vehicle body bumper mounting portion structure of the second embodiment, one of the fitting portions sandwiching the side member vertical wall has a structure in which the end of the vehicle outer bumper bracket is applied to the inner surface of the side member vehicle inner vertical wall. The stopper can be formed integrally, and the cross-sectional deformation of the front end of the side member can be more reliably suppressed.

In the vehicle body bumper mounting portion structure of the third embodiment, the number of parts can be reduced because the fitting portion and the bumper mounting portion are formed integrally with the bumper bracket using a light alloy extruded material or the like, so that the number of parts can be reduced. The number of assembling steps can be reduced.

In the vehicle body bumper mounting portion structure according to the fourth embodiment, since a protrusion is provided on a part of the radial core support so as to be inserted into the cross section of the front end of the side member to form a fitting portion. The same effect can be obtained in a general bumper bracket structure having a bumper mounting flange from the side member toward both sides.

[Brief description of the drawings]

FIG. 1 is a configuration perspective view of a first embodiment of a vehicle body bumper mounting portion structure according to the present invention, as viewed obliquely from the front of the vehicle body.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an operational view (a sectional view at the same position as in FIG. 2) of the bumper mounting portion of the first embodiment.

FIG. 4 is a block diagram illustrating transmission of a force (collision side) of a bumper attachment portion according to the first embodiment.

FIG. 5A is a cross-sectional view of the bumper mounting portion according to the second embodiment (a cross-sectional view at the same position as FIG. 2), and FIG. 5B is a perspective view of a bumper bracket of the bumper mounting portion.

6A is a cross-sectional view (a cross-sectional view at the same position as FIG. 2) of a bumper mounting portion according to a third embodiment, and FIG. 6B is a perspective view of a bumper bracket of the bumper mounting portion.

FIG. 7 is a perspective view showing the structure of a bumper mounting portion according to a fourth embodiment, as viewed obliquely from the front of the vehicle body.

FIG. 8 is a sectional view taken along line BB of FIG. 6;

FIG. 9 is a perspective view showing a conventional bumper mounting portion structure as viewed obliquely from the front of the vehicle body.

FIG. 10 is a schematic view of the operation of a side member and a bumper at the time of an offset collision of a front portion of a vehicle body, and is a plan view seen from above.

FIG. 11 is an operation view (a sectional view at the same position as in FIG. 2) of a conventional bumper mounting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bumper attachment part 2 Side member 3 Bumper 4, 14 Vehicle inner bumper bracket 4a, 5a, 15b, 37a Fitting part 4c, 5c Joint flange 4d, 5d Bumper fixing nut 5, 15 Vehicle outer bumper bracket 6, 16 Engagement stop Part 7 Radial core support 14a Connecting part 24, 34, 35 Bumper bracket 34a, 35a Bumper mounting part flange 37 Projection

Claims (4)

[Claims] 1. A structure for mounting a bumper on a vehicle body, comprising: a bumper bracket provided with a fitting portion sandwiching a front end vertical wall of a side member; and an input to the vehicle outer bumper bracket mounted on a side member. A structure for mounting a vehicle body bumper, comprising a locking portion for transmitting to a bracket. 2. The vehicle body bumper mounting structure according to claim 1, wherein one of the fitting portions sandwiching the side member vertical wall abuts the end of the vehicle outer bumper bracket against the inner surface of the side member vehicle inner vertical wall. A body bumper mounting structure. 3. The vehicle body bumper mounting part structure according to claim 1, wherein the fitting part and the bumper mounting part are formed integrally with the bumper bracket by using a light alloy extruded material or the like. . 4. The vehicle body bumper mounting structure according to claim 1, wherein the bumper is mounted to a side member via a radial core support, and the bumper is inserted into a part of the radial core support inside a cross section of a front end of the side member. A vehicle body bumper mounting portion, characterized in that the protrusion portion is provided and a fitting portion is formed.