JP3956563B2 - Body front structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body front structure that can improve the work efficiency of welding work when joining a dash panel and a cowl upper panel, and can improve rigidity against a load acting on a joint surface.
[0002]
[Prior art]
In the vehicle body front structure in which the dash panel and the cowl upper panel are divided into upper and lower parts, generally, as shown in FIG. 8, a flange 101 formed at the upper end of the dash panel 100 in the vehicle width direction is used as the cowl upper panel. The bottom surface 102a of 102 is joined by spot welding.
[0003]
[Problems to be solved by the invention]
However, as shown in FIG. 8, the work space of the spot guns 104a and 104b cannot be secured in the place where the strut tower 103 is provided close to the spot gun. Therefore, a special spot gun must be used only for that part. It was.
Further, when the strut 105 is assembled, the impact tool 108 for tightening the nut 107a for fixing the mounting bolt 107 to the suspension upper bracket 106 is not convenient.
[0004]
The present invention solves the above-mentioned problems, and improves the work efficiency of welding work when joining the dash panel and the cowl upper panel, and improves the rigidity against the load acting on the joint surface, thereby providing a vehicle body front structure. With the goal.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has a vehicle body front structure in which an upper end flange portion of a dash panel is joined to a lower surface of a cowl upper panel, and strut tower portions of a front suspension are disposed on both front portions of the dash panel. The rear end of the suspension upper bracket that forms the upper surface of the strut tower is joined to the front of the dash panel, and the upper wall surface of the dash panel located above the joint of the suspension upper bracket is joined from the joint of the suspension upper bracket. is bent to be inclined toward the rear of the vehicle body, thereby forming the inclined surface of the front rising the upper flange portion of each side portion of the dash panel the rear end portion of the strut tower portion is joined forward, the cowl upper panel Inclination corresponding to the inclined surface of the dash panel at the bottom front end To form a surface, by superimposing these inclined surfaces with each other lies in the spot welding by spot gun.
In the present invention, the bottom surface of the cowl upper panel is disposed behind corners of the inclined surface formed on the upper flange portion on both sides of the dash panel and the inclined surface formed on the wall surface of the dash panel. It is to have done.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a front structure of a vehicle body when the cowl portion is viewed from the front side of the vehicle body. The cowl portion 1 is a cowl top that closes a cowl upper panel 2 having an inverted hat cross section and an upper surface opening that partitions an engine room 4 and a vehicle interior 5. It consists of panel 3. A dash panel 6 that partitions the engine room 4 and the vehicle interior 5 is disposed on the lower side of the cowl portion 1. A dash side panel (not shown) is provided on both sides of the dash panel 6, and a fender apron panel 7 is disposed in front of both sides of the dash panel 6 on the front side thereof. The fender apron panel 7 is formed with a strut tower portion 8 in which a front suspension is built, and a suspension upper bracket 9 is disposed on the upper surface of the strut tower portion 8.
[0007]
As shown in FIGS. 2 and 3 (a), 3 (b), and 3 (c), the dash panel 6 is a flange portion that is bent toward the front of the vehicle body at the upper end of a wall surface 6a that partitions the engine room 4 and the vehicle interior 5. 6b is provided and is spot-welded to the bottom surface 2a of the cowl upper panel 2 through the flange portion 6b. Among the flange portions 6b, the flange portions 6c above the both side portions of the dash panel 6 to which the rear end portion of the strut tower portion 8 and the rear end portion of the suspension upper bracket 9 are joined are inclined surfaces 10 that rise frontward toward the front. Is formed. On the other hand, an inclined surface 11 corresponding to the inclined surface 10 of the dash panel 6 is formed at the front end portion of the bottom surface 2 a of the cowl upper panel 2 corresponding to the inclined surface 10.
[0008]
Both side portions of the dash panel 6 are spot welded to the inclined surface 11 of the cowl upper panel 2 via the inclined surface 10.
At the upper end of the wall surface 6a of the dash panel 6 on which the inclined surface 10 is formed, as shown in FIG. 4, substantially the same angle α≈ in the opposite direction to the inclined surface 10 with respect to the bottom surface 2a of the cowl upper panel 2. An inclined surface 12 is formed in a direction intersecting with the bottom surface 2a at β. The bottom surface 2 a of the cowl upper panel 2 is arranged behind the corner portion 13 formed by the inclined surfaces 10 and the inclined surfaces 12 on both sides of the dash panel 6.
[0009]
According to the above configuration, when joining both side portions of the dash panel 6, as shown in FIG. 5, the inclined surfaces 10 on both sides of the dash panel 6 and the inclined surface 11 of the cowl upper panel 2 are combined by the spot guns 14a and 14b. Spot weld.
Since the inclined surface 10 is formed on both sides of the dash panel 6, the spot guns 14 a and 14 b can be easily arranged, so that it is not necessary to use a special spot gun for welding work.
[0010]
Further, since the joining surfaces of the dash panel 6 and the cowl upper panel 2 are formed on the inclined surfaces 10 and 11, respectively, when an impact load is applied from the front, as shown in FIG. It can be received in a distributed manner in the force Fb in the surface compression direction.
An inclined surface 12 is formed on the lower side of the inclined surface 10 on both sides of the dash panel 6 toward the rear of the vehicle body so that the cowl upper panel 2 does not protrude above the suspension upper bracket 9. . Therefore, as shown in FIG. 6, when the suspension strut 15 is attached, the impact tool 17 for tightening the nut 16a for fixing the bolt 16 to the suspension upper bracket 9 is easy to use.
Since the bottom surface 2a of the cowl upper panel 2 is disposed behind the corner portion 13 formed by the inclined surface 10 and the inclined surface 12 on both sides of the dash panel 6, a load applied to the rear portion of the vehicle body acting on the corner portion 13 is provided. Can also be received on the bottom surface 2a of the cowl upper panel 2.
[0011]
Further, the upper end of the wall surface 6a of the dash panel 6 on which the inclined surface 10 is formed intersects the bottom surface 2a at substantially the same angle α≈β in the opposite direction to the inclined surface 10 with respect to the bottom surface 2a of the cowl upper panel 2. An inclined surface 12 is formed in a direction (see FIG. 4). As a result, the input load F ′ in the vertical direction of the suspension upper bracket 9 can be distributed and received in the shearing force Fa ′ and the force Fb ′ in the surface compression direction, as shown in FIG.
[0012]
The present invention is not limited only to the above embodiment. For example, the inclined surface 10 and the inclined surface 12 formed on both sides of the dash panel 6 can be appropriately selected at an arbitrary angle. it can. Further, the protruding position of the cowl upper panel 2 can be arbitrarily adjusted by adjusting the length of the inclined surface 12. In addition, it goes without saying that the present invention can be implemented with appropriate modifications within the scope not changing the gist of the present invention.
[0013]
【The invention's effect】
As described above, according to the vehicle body front portion structure of the present invention, the following effects can be obtained.
2. The vehicle body front structure according to claim 1, wherein the upper end flange portion of the dash panel is joined to the lower surface of the cowl upper panel, and the strut tower portions of the front suspension are disposed on both front portions of the dash panel . The rear end of the suspension upper bracket that forms the upper surface is joined to the front of the dash panel, and the upper wall surface of the dash panel located above the joint of the suspension upper bracket is bent from the joint of the suspension upper bracket. It is inclined to, and forming the inclined surface of the front rising the upper flange portion of each side portion of the dash panel the rear end portion of the strut tower portion is joined forward, above the bottom front end of the cowl upper panel Form an inclined surface corresponding to the inclined surface of the dash panel, Since the spot welding by spot gun by superimposing each other these inclined surfaces, it is possible to enlarge the working space of the spot gun. Moreover, it is possible to receive the input in a distributed manner not only in the shearing direction of the joint surface but also in the surface compression direction with respect to the impact load from the front. Furthermore, since it can receive also to the input load of an up-down direction also in the shearing direction of a joint surface, a deformation | transformation of a cowl upper panel and a dash panel can be prevented. The rear end of the suspension upper bracket that forms the upper surface of the strut tower is joined to the front of the dash panel, and the upper wall surface of the dash panel located above the joint of the suspension upper bracket is inclined to the rear of the vehicle body. The strut assembly work can be easily performed.
According to claim 2, is disposed and inclined surfaces formed on the upper end flange portion of both side portions of the dash panel, the bottom surface of the cowl upper panel behind the corner between the inclined surface formed on the wall surface of the dash panel Therefore, the load applied to the corner portion of the inclined surface can be distributed and received also on the bottom surface of the cowl upper panel.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a vehicle body front structure according to the present invention.
FIG. 2 is a perspective view showing the dash panel of FIG. 1;
3 is a cross-sectional view of the dash panel of FIG. 2, wherein (a) is a cross-sectional view taken along the line BB of FIG. 2, (b) is a cross-sectional view taken along the line CC of FIG. 2, and (c) is a cross-sectional view. It is the DD sectional view taken on the line of FIG.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a cross-sectional view showing how to use a spot gun.
FIG. 6 is a cross-sectional view showing a method of tightening a nut with a tool.
FIG. 7 is a cross-sectional view showing a shearing force due to an input load in the vertical direction of the suspension upper bracket and a force in the surface compression direction.
FIG. 8 is a conceptual cross-sectional view showing a conventional vehicle body front structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cowl part 2 Cowl upper panel 3 Cowl top panel 4 Engine room 5 Car interior 6 Dash panel 7 Fender apron panel 8 Strut tower part 9 Suspension upper bracket 10 Inclined surface 11 Inclined surface 12 Inclined surface 13 Corners 14a and 14b Spot gun 17 Impact tool 2a Bottom surface 6a Wall surface 6c Upper end flange

Claims (2)

In the vehicle body front structure in which the upper end flange portion of the dash panel is joined to the lower surface of the cowl upper panel, and the strut tower portions of the front suspension are arranged on the front portions on both sides of the dash panel,
The rear end of the suspension upper bracket that forms the upper surface of the strut tower is joined to the front of the dash panel, and the upper wall surface of the dash panel located above the joint of the suspension upper bracket is joined from the joint of the suspension upper bracket. is bent to be inclined toward the rear of the vehicle body, thereby forming the inclined surface of the front rising the upper flange portion of each side portion of the dash panel the rear end portion of the strut tower portion is joined forward, the cowl upper panel A vehicle body front structure characterized in that an inclined surface corresponding to the inclined surface of the dash panel is formed at the front end portion of the bottom surface, and these inclined surfaces are overlapped with each other and spot welded by a spot gun . The bottom surface of the cowl upper panel is disposed behind corners of inclined surfaces formed on upper end flange portions on both sides of the dash panel and inclined surfaces formed on a wall surface of the dash panel. The vehicle body front part structure according to claim 1 .

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