JP4026522B2 - Body front structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body front structure.
[0002]
[Prior art]
Vehicles such as automobiles are desired to be able to suppress cabin deformation by dispersing energy at the time of collision in the vehicle body. For example, on the outer surface of the front end portion of the load transmission member arranged below the side member, When a load receiving part having an inclined surface is provided, and a collision load is input obliquely from the front of the vehicle, the bending load at the front end part of the load transmitting member is changed to the bending load above the side member via the load receiving part. It is known that the energy is converted and dispersed from the side member to another body frame member connected thereto, and the side member is bent and deformed upward to absorb the collision energy (see Patent Document 1). .)
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-321643 (page 4, FIG. 12)
[0004]
[Problems to be solved by the invention]
However, in such a conventional vehicle body front structure, the input load at the time of the collision of the automobile is absorbed and dispersed mainly by bending of the member, and energy absorption and load dispersion are not possible depending on the change of the collision direction. It may be sufficient.
[0005]
Accordingly, the present invention provides a vehicle body front structure that can efficiently disperse a collision load in either a frontal collision or an oblique collision.
[0006]
[Means for Solving the Problems]
In the present invention, the vehicle width direction end of the bumper reinforcement is disposed in front of the front side member and inward in the vehicle width direction, and the front end of the front side member and the vehicle width direction end of the bumper reinforcement are connected to the bumper stay. And a load transmission member that goes around the bumper stay and connects the hood ridge member and the suspension member, and an intermediate portion of the load transmission member is attached to the outer surface of the bumper stay. It is said.
[0007]
【The invention's effect】
According to the present invention, the collision load input to the load transmission member is distributed to the hood ridge member and the suspension member connected to the load transmission member, and the bumper reinforcement is provided via the bumper stay to which the load transmission member is attached. The front side member can be dispersed in the axial direction, and even when the collision direction such as oblique forward collision or frontal collision is different, the collision load is input to the load transmitting member, so that the load can be efficiently transmitted to other members. Can be dispersed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0009]
1 to 12 show an embodiment of a vehicle body front structure according to the present invention, FIG. 1 is a perspective view of a skeleton structure of a left side portion of the vehicle body front, FIG. 2 is a plan sectional view of a mounting portion of a bumper stay, 3 is an enlarged exploded perspective view of a bumper stay mounting portion, FIG. 4 is an exploded perspective view of the bumper stay, FIG. 5 is an exploded perspective view of a connecting portion between the load transmission member and the hood ridge member, and FIG. FIG. 7 is a perspective view of the load transmission member, FIG. 8 is an enlarged cross-sectional view taken along the line AA in FIG. 7, and FIG. 9 shows a load transmission path in a diagonal forward collision. 10 is a side view showing a load transmission path at the time of a frontal collision, FIG. 11 is a plan sectional view showing a deformation state at the time of a frontal collision, and FIG. 12 is a plan sectional view showing a load input state at the time of a frontal collision. It is.
[0010]
As shown in FIG. 1, the vehicle according to the present embodiment has front side members 2 extending in the vehicle front-rear direction on both sides in the vehicle width direction of the front compartment 1, and straddles the front end portions of the front side members 2. A bumper reinforcement 4 is connected via a bumper stay 3.
[0011]
A hood ridge member 5 that is positioned above the front side member 2 and extends in the vehicle front-rear direction is disposed, and a rear end portion of the hood ridge member 5 is coupled to and supported by a front pillar. In the form, a radio core upper rail 5 a is integrally formed at the front end of the hood ridge member 5.
[0012]
A suspension member 6 for connecting and supporting the front suspension is disposed below the front side member 2.
[0013]
Here, in the present embodiment, the vehicle width direction end 4a of the bumper reinforcement 4 is disposed in front of the front side member 2 and inward in the vehicle width direction as shown in FIG. The bumper stay 3 is attached across the front end 2 a and the vehicle width direction end 4 a of the bumper reinforcement 4, and the load transmission member that goes around the bumper stay 3 and connects the hood ridge member 5 and the suspension member 6. 10, and an intermediate portion of the load transmission member 10 is attached to the bumper stay 3.
[0014]
As shown in FIG. 3, the bumper stay 3 includes a first mounting surface 3a for closing and connecting the front end 2a of the front side member 2 having a closed cross-section structure, and an end in the vehicle width direction of the bumper reinforcement 4 having the same closed cross-section structure. A second mounting surface 3b that closes and couples 4a, and an inclined surface 3c that is connected obliquely across the outer edges of the first mounting surface 3a and the second mounting surface 3b and to which the load transmitting member 10 is mounted. The first and second mounting surfaces 3a and 3b and the inclined surface 3c constitute a closed section having a substantially triangular plane.
[0015]
As shown in FIG. 4, the bumper stay 3 includes first and second mounting surfaces 3a and 3b and an inclined surface 3c formed of a plate material such as a steel plate, and the vehicle inner end portion of the first mounting surface 3a 2 Spot welding is performed on the rear extension 3b 'of the mounting surface 3b, and both side portions of the inclined surface 3c are spot welded to the outer edges of the first mounting surface 3a and the second mounting surface 3b.
[0016]
A mounting hole H1 is formed in the vehicle outer end 3a ′ of the first mounting surface 3a, and a mounting hole H2 is formed in the end of the rear extension 3b ′ of the second mounting surface 3b. In addition, mounting holes H3 are formed in the vehicle front end 3b ″ of the second mounting surface 3b, and mounting holes H4 of the mounting bracket 11 of the load transmitting member 10 are formed in both ends of the inclined surface 3c. is there.
[0017]
Further, in order to connect the bumper stay 3, a first flange 2b is provided on the vehicle outer side of the front end 2a of the front side member 2, and at the vehicle rear side of the vehicle width direction end 4a of the bumper reinforcement 4. A second flange 4b is projected.
[0018]
Further, a mounting hole H1a is formed in the first flange 2b, a mounting hole H2a is formed in the inner wall of the front end portion of the front side member 2, a mounting hole H2b is formed in the second flange 4b, and the bumper reinforcement 4 A mounting hole H3a is formed in the front wall of the end.
[0019]
As shown in FIG. 2, the first mounting surface 3a of the bumper stay 3 abuts on the front end of the front side member 2, and the second mounting surface 3b abuts on the end of the bumper reinforcement 4, and the rear extension portion 3b 'is sandwiched between the vehicle inner wall of the front side member 2 and the second flange 4b, and coupled to the mounting holes H2a, H2, H2b through fastening members such as bolts and rivets (the same applies to the following fastening members). On the other hand, the vehicle front end portion 3b ″ of the second mounting surface 3b is brought into contact with the front wall of the end portion of the bumper reinforcement 4 and is coupled through the mounting holes H3 and H3a via the fastening member, and the first mounting surface 3a. The vehicle outer end 3a 'is in contact with the first flange 2b of the front end 2a of the front side member, and is coupled to the mounting holes H1 and H1a through fastening members.
[0020]
In this way, both end portions in the vehicle width direction of the bumper reinforcement 4 are connected to the front end portions of the pair of left and right front side members 2 via the bumper stay 3, but the bumper reinforcement 4 is entirely forward of the vehicle body. Curved in the protruding direction.
[0021]
As shown in FIG. 3, the mounting bracket 11 is fixed to the load transmitting member 10 by welding at a portion located on the bumper stay 3, and mounting holes H <b> 4 a are formed in flanges 11 a provided at both ends of the mounting bracket 11. The mounting bracket 11 is disposed on the inclined surface 3c of the bumper stay 3 and is coupled to the mounting holes H4 and H4a through fastening members.
[0022]
As shown in FIGS. 3 and 4, the inclined surface 3c is press-molded with a plurality of bead portions 7 that protrude outward and extend in the horizontal direction, and the rigidity of the inclined surface 3c is increased. It is larger than the first mounting surface 3a and the second mounting surface 3b.
[0023]
Further, when the load transmitting member 10 is coupled to the inclined surface 3c via the mounting bracket 11, a necessary gap is provided between the load transmitting member 10 and the inclined surface 3c.
[0024]
As shown in FIGS. 1 and 7, the load transmission member 10 has an upper portion connected to the hood ridge member 5, an upper portion connected to the bumper stay 3, and a suspension member 6. The lower part to be connected is curved toward the rear of the vehicle.
[0025]
Then, the upper end portion of the load transmission member 10 is connected to the hood ridge member 5, and the connecting portion is bifurcated so that the upper and lower surfaces of the hood ridge member 5 are sandwiched between the ends of the load transmission member 10 as shown in FIG. A mounting portion 10a is formed, and the bifurcated mounting portion 10a is inserted with sufficient interference and strength to transmit a load to the hood ridge member 5, and the mounting hole H5 of the bifurcated mounting portion 10a and the hood ridge member 5 are mounted. It is connected to the hole H5a through a fastening member.
[0026]
Further, the lower end portion of the load transmission member 10 is connected to the suspension member 6. As shown in FIG. 6, the connection portion forms a tapered insertion portion 10b at the end of the load transmission member 10, and this insertion portion 10b. Is inserted into an insertion port 6a formed in the suspension member 6, and is coupled to a mounting hole H6 formed in the insertion port 6a and a mounting hole H6a formed in the insertion portion 10b through a fastening member.
[0027]
By the way, the intermediate portion of the load transmission member 10 is attached to the bumper stay 3 in this way, the upper end portion is coupled to the hood ridge member 5, and the lower end portion is coupled to the suspension member 6. In this embodiment, the load transmission member 10 The strength of the connecting side to the hood ridge member 5 and the connecting side to the suspension member 6 are made equal at the attachment portion to the bumper stay 3.
[0028]
The load transmitting member 10 is formed using a circular tube having a circular cross section as shown in FIG. 8, and in this embodiment, the load transmitting member 10 is shown in FIG. 7 using a hydroform formed into a desired shape using hydraulic pressure. The load transmission member 10 is made of iron or aluminum and has a predetermined strength.
[0029]
In the vehicle body front part structure of the present embodiment having the above configuration, when the collision load Fi is input from the counterpart vehicle M to the load transmission member 10 closest to the collision surface, as shown in FIG. This input load Fi is input from the load transmitting member 10 to the inclined surface 3 c of the bumper stay 3.
[0030]
Then, the collision load Fi input to the inclined surface 3c is dispersed by the inclined surface 3c, and one load fi1 is transmitted in the axial direction of the front side member 2 via the first mounting surface 3a, and the other load is transmitted. fi2 is transmitted in the axial direction of the bumper reinforcement 4 via the second mounting surface 3b, and the load is distributed to the front side member 2 and the bumper reinforcement 4.
[0031]
Further, the load transmitting member 10 is crushed and deformed by the collision load Fi, and the bumper stay 3 is pressed against the inclined surface 3c having a large rigidity, and the first and second mounting surfaces 3a and 3b are deformed. 10 and the deformation of the bumper stay 3 can absorb the collision energy and reduce the lateral load acting on the front side member 2.
[0032]
On the other hand, at the time of a frontal collision, when a collision load Ff is input from the opponent vehicle M as shown in FIGS. 10 and 11, the collision load Ff passes through the bumper reinforcement 4, the load transmission member 10, and the bumper stay 3. Input to member 2.
[0033]
At this time, the collision load input to the load transmission member 10 can be distributed to the hood ridge member 5 and the suspension member 6 connected to the load transmission member 10.
[0034]
Therefore, the collision loads Fi and Ff can be efficiently dispersed even when the respective collision directions are different, such as an oblique forward collision or a frontal collision.
[0035]
In the present embodiment, in addition to the above-described effects, the bumper stay 3 is connected to the front mounting member 3a by closing the front end 2a of the front side member 2 and the bumper reinforcement 4 in the vehicle width direction end. A second mounting surface 3b that closes and joins 4a, and an inclined surface 3c that is obliquely connected across the outer edges of the first mounting surface 3a and the second mounting surface 3b, and has a substantially triangular plane. Since the closed cross section is configured, the load input from the load transmitting member 10 to the inclined surface 3c can be efficiently distributed to the first mounting surface 3a and the second mounting surface 3b.
[0036]
Further, the inclined surface 3c is press-molded with a bead portion 7 as rigidity increasing means, and the rigidity of the inclined surface 3c is made larger than that of the first mounting surface 3a and the second mounting surface 3b. The input collision load is maintained in the direction of the first and second mounting surfaces 3a and 3b, that is, the axial load on the front side member 2 and the bumper reinforcement 4, and the first and second mounting surfaces 3a and 3b and The amount of energy absorbed by the crushing deformation of the closed section formed by the inclined surface 3c can be increased.
[0037]
In addition, since the strength of the upper connection side to the hood ridge member 5 and the lower connection side to the suspension member 6 are equalized at the mounting portion of the load transmission member 10 to the bumper stay 3, Since the input collision load can be distributed substantially evenly to the hood ridge member 5 and the suspension member 6, a stable vehicle body deformation mode can be obtained.
[0038]
Further, since the load transmission member 10 is bent toward the rear of the vehicle with the apex T as the mounting portion to the bumper stay 3, the load transmission member 10 efficiently inputs the collision load input to the load transmission member 10. Can be distributed to the hood ridge member 5 and the suspension member 6.
[0039]
Furthermore, since a required gap is provided between the load transmitting member 10 and the inclined surface 3c, the timing for transmitting the collision load input to the load transmitting member 10 to the front side member 2 via the bumper stay 3 is adjusted. In the meantime, the load can be effectively distributed to other members such as the hood ridge member 5 and the suspension member 6.
[0040]
Further, since the bumper reinforcement 4 is formed so as to be bent in a direction protruding forward of the vehicle body, when a collision load Ff is input to the bumper reinforcement 4 at the time of a frontal collision, the bumper reinforcement 4 is compressed to the bumper reinforcement 4 as shown in FIG. The load acts to suppress buckling deformation, and the load can be efficiently distributed to the front side member 2 via the bumper stays 3 at both ends.
[0041]
By the way, in the first embodiment, the bumper stay 3 is configured as a triangular closed cross-sectional structure by spot welding of a plate material. However, the present invention is not limited to this, and the bumper stay 3 is integrally formed by casting as in the second embodiment shown in FIG. The stay 20 may be formed, and even in this case, the first mounting surface 21, the second mounting surface 22, the rear extension 22 a of the second mounting surface 22, and the inclined surface 23 are formed as in the bumper stay 3. In order to increase the rigidity of the inclined surface 23, a plurality of bead portions 24 are formed.
[0042]
In this case, the material of the bumper stay 20 may be any material that can ensure a desired strength. For example, iron, aluminum, magnesium, foam metal, or the like can be used.
[0043]
In addition, a rib 25 as energy absorbing means is formed in the closed cross section constituted by the first and second mounting surfaces 21 and 22 and the inclined surface 23.
[0044]
Therefore, by providing the rib 25 in the closed cross section of the bumper stay 20 in this way, the amount of collision energy absorbed can be increased by the deformation of the rib 25 when the bumper stay 20 is deformed by the input of the collision load.
[0045]
Further, the rigidity of the inclined surface 23 of the bumper stay 20 can be ensured by adjusting the plate thickness without providing the bead portion 24, and the inclined surface 23 is made of iron, and the first and second attachments are made. The surfaces 21 and 22 may be made of a rigid resin.
[0046]
Furthermore, although the case where the load transmitting member 10 is formed by a circular tube having a circular cross section has been disclosed, the cross sectional shape is not limited to a circular shape, as long as a desired rigidity can be secured. For example, as shown in FIG. The cross section may be a hexagonal cross section. Alternatively, as shown in FIGS. 14B and 14C, two plate members may be welded to form a hat cross section or a rectangular cross section.
[0047]
14 (d) and 14 (e), when the load transmitting member 10 is formed of a tubular body (in this case, a circular tube), ribs 12 as a strength adjusting means, foam metal or foam polystyrene are provided therein. An energy absorbing material 13 such as can be provided.
[0048]
Therefore, by providing the rib 12 and the energy absorber 13 on the load transmitting member 10 in this way, the strength of the load transmitting member 10 can be adjusted, and thereby the hood ridge member 5 and the suspension member connected to the load transmitting member 10 can be adjusted. According to the strength of 6, load distribution efficiency can be increased. Note that the thickness of the load transmitting member 10 can be changed as the strength adjusting means.
[0049]
Furthermore, the vehicle body front structure of the present invention has been described by taking the above embodiment as an example. However, the present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention.
[Brief description of the drawings]
FIG. 1 is a perspective view of a skeleton structure of a left side portion of a front portion of a vehicle body showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional plan view of a bumper stay mounting portion according to the first embodiment of the present invention.
FIG. 3 is an enlarged exploded perspective view of a mounting portion of a bumper stay in the first embodiment of the present invention.
FIG. 4 is an exploded perspective view of a bumper stay in the first embodiment of the present invention.
FIG. 5 is an exploded perspective view of a connecting portion between a load transmission member and a hood ridge member according to the first embodiment of the present invention.
FIG. 6 is an exploded perspective view of a connecting portion between a load transmission member and a suspension member according to the first embodiment of the present invention.
FIG. 7 is a perspective view of a load transmission member according to the first embodiment of the present invention.
8 is an enlarged cross-sectional view taken along line AA in FIG.
FIG. 9 is a plan sectional view showing a load transmission path at the time of an oblique forward collision in the first embodiment of the present invention.
FIG. 10 is a side view showing a load transmission path at the time of a frontal collision in the first embodiment of the present invention.
FIG. 11 is a plan sectional view showing a deformed state at the time of a frontal collision in the first embodiment of the present invention.
FIG. 12 is a plan sectional view showing a load input state at the time of a frontal collision in the first embodiment of the present invention.
FIG. 13 is a perspective view of a bumper stay in a second embodiment of the present invention.
FIG. 14 is a cross-sectional view illustrating different examples of the cross-sectional shape of the load transmitting member according to the present invention by (a) to (e).
[Explanation of symbols]
2 Front side member 2a Front end 3 of front side member 3, 20 Bumper stays 3a, 21 First mounting surface 3b, 22 Second mounting surface 3c, 23 Inclined surface 4 Bumper reinforcement 4a Bumper reinforcement 4 in the vehicle width direction 5 Hood ridge Member 6 Suspension member 7, 24 Bead (rigidity increasing means)
10 Load transmission member

Claims (9)

Front side members extending in the vehicle front-rear direction on both sides in the vehicle width direction at the front of the vehicle body, bumper reinforcements disposed at the front ends of these front side members, and in the vehicle front-rear direction located above the front side members In the vehicle body front part structure provided with the hood ridge member arranged to extend and the suspension member arranged below the front side member,
One end of the bumper reinforcement in the vehicle width direction is disposed in front of the front side member and inward in the vehicle width direction, and the front end of the front side member and the end of the bumper reinforcement in the vehicle width direction are connected via a bumper stay. A vehicle body front portion characterized in that a load transmission member is provided around the bumper stay to connect the hood ridge member and the suspension member, and an intermediate portion of the load transmission member is attached to the outer surface of the bumper stay. Construction. The bumper stay includes a first mounting surface that closes and connects the front end of the front side member, a second mounting surface that closes and connects the end of the bumper reinforcement in the vehicle width direction, and the first and second mounting surfaces. The vehicle body front structure according to claim 1, further comprising an inclined surface that is connected obliquely across each outer edge of the surface and to which the load transmitting member is attached. The vehicle body front part structure according to claim 2, wherein rigidity increasing means for increasing rigidity is provided on the inclined surface as compared with the first mounting surface and the second mounting surface. The vehicle body front structure according to claim 2 or 3, wherein an energy absorbing means is provided in a closed cross section constituted by the first mounting surface, the second mounting surface, and the inclined surface. The vehicle body front part structure according to any one of claims 1 to 4, wherein the load transmitting member is provided with strength adjusting means. 6. The load transmitting member according to claim 1, wherein the strength of the connecting side to the hood ridge member and the connecting side to the suspension member are equal at the mounting portion to the bumper stay. Vehicle body front structure described in 2. The vehicle body front part structure according to any one of claims 1 to 6, wherein the load transmission member has an attachment portion to the bumper stay as a top and its upper and lower portions are curved toward the rear of the vehicle. The vehicle body front part structure according to any one of claims 1 to 7, wherein a required gap is provided between the bumper stay and a load transmission member attached to the bumper stay. The vehicle body front part structure according to any one of claims 1 to 8, wherein the bumper reinforcement is curved in a direction projecting forward of the vehicle body.

Images