JP2003127910A - Front body structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling work for a front body part of a car body. SOLUTION: The front body part of a car body 1 is provided with a pair of right/left front side members 2, 2; a pair of right/left front side member outer panels 3 welded (S1) to the outer side surfaces of the respective front side members 2; a dash cross member 6 placed behind both the front side members 2, extended in the width direction of the vehicle, wherein the respective end parts in the width direction are welded (S2) to the rear end parts 5 of the respective front side members 2, and end surfaces of the respective end parts 4 are welded (S3) to the respective front side member outer panels 3; and a dash panel 7 placed behind the dash cross member 6, vertically extended and welded (S4) to the dash cross member 6. The respective end parts 4 in the width direction and the intermediate part 32 of the dash cross member 6 are segmentized, and front surfaces of respective divided end parts 32a of the intermediate part 32 are joined and welded (W) to rear surfaces of divided end parts 4a of the respective end parts 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body front structure for a portion in which front side members, dash cross members, etc., which constitute a vehicle body front portion, are connected to each other.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned vehicle body front structure is
There is one shown in FIGS. 6 to 8, which will be described.

In FIGS. 6 and 7, reference numeral 1 denotes a sheet metal front portion of a vehicle body of an automobile, and an arrow Fr indicates the front in the traveling direction of the automobile.

The front part 1 of the vehicle body is arranged so as to be adjacent to the outside of each of the front side members 2 and a pair of left and right front side members 2 extending in the front-rear direction and extends in the vertical direction. A pair of left and right front side member outer panels 3 and 3 joined to the outer side surface of the front side member 2 by spot welding S1 and the rear side front and rear members 2 and 2 are arranged adjacent to each other and extend in the width direction of the vehicle body. Each end portion 4 in the direction is joined to the rear end portion 5 of each front side member 2 by spot welding S2, and the end surface of each end portion 4 is joined to each front side member outer panel 3 by spot welding S3. The dash cross member 6 and the dash cross member 6 are arranged adjacent to the rear of the dash cross member 6 and extend vertically. Yukurosumenba 6 spot welding S
And a dash panel 7 connected by 4.

The rear end portion 5 of each of the front side members 2
There are provided midway side members 10 extending rearward and downward from the rear side members 11 and rear side members 11 extending rearward from the rear ends of the midway side members 10, respectively. Further, a floor panel 12 extending rearward from the lower end edge of the dash panel 7 is provided, and the floor panel 12 is the midway side member 1.
0 and the rear side member 11 are joined by spot welding.

An engine room 14 is a space surrounded by both the front side member outer panels 3 and 3, the left and right front fender aprons extending upward from the front side member outer panels 3 and the dash panel 7. A space above the floor panel 12 behind the dash panel 7 is defined as a vehicle compartment 15.

According to the above construction, the rear end portion 5 of the front side member 2 is the end portion 4 of the dash cross member 6.
Is joined to the front surface of the in a butting shape. Therefore, when the vehicle collides with any object in front of it while the vehicle is traveling (at the time of front collision), the impact force applied to the end 4 of the dash cross member 6 via the front side member 2 is At the end 4 of 6, it is supported as a compressive stress having a high strength instead of a shear stress having a low strength. Therefore, the impact force is firmly supported by the front side member 2 and the dash cross member 6, and thus the deformation of the passenger compartment 15 is prevented.

6 to 8, the assembling work of the vehicle body front part 1 will be described. First, the front side member outer panel 3 is joined to the front side member 2 by spot welding S1 to form an assembly (2, 3). Mold. Next, as shown in FIG. 8, from the rear of the assembly (2, 3), the end 4 of the dash cross member 6 is joined to the rear end 5 of the front side member 2 by spot welding S2. The ends 4 of the dash cross member 6 are joined to the front side member outer panel 3 and joined by spot welding S3. Next, the dash panel 7 is joined to the rear surface of the dash cross member 6 and joined by spot welding S4. Then, the assembling work of the vehicle body front part 1 is completed.

[0009]

By the way, the work of connecting the dash cross member 6 and the dash panel 7 to the assembly (2, 3) of the front side member 2 and the front side member outer panel 3 is performed by these dash cross members. 6 and the dash panel 7 are sequentially connected. These dash cross members 6
And the dash panel 7 are large in shape,
The above-mentioned joining work requires a long time, and therefore the work load of the assembly line for this work may be excessive compared with other lines, and as a result, the assembling work of the vehicle body front part 1 becomes complicated. It tends to be.

Therefore, a dash panel 7 is spot-welded to the dash cross member 6 on a line different from the assembly line for molding the assembly (2, 3) S4.
Adopting a joining operation of joining the other assembly (6, 7) to the above assembly (2, 3) by spot welding S2, S3 by forming Can be considered.

However, if the above-mentioned joining work is adopted, when the other assembly (6, 7) is joined to a predetermined portion of the assembly (2, 3), the end of the dash cross member 6 is joined. The portion 4 is surrounded by the front side member 2, the front side member outer panel 3, and the dash panel 7. Therefore, the end portion 4 of the dash cross member 6 is spot-welded to the front side member outer panel 3 by spot welding S3. It is extremely difficult to do so, that is, the assembling work of the vehicle body front portion 1 as described above may be extremely complicated.

Therefore, in the above-mentioned conventional technique, the vehicle body front portion 1
There is room for improvement in making the assembling work easier.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it easier to assemble the front portion of a vehicle body.

Further, even when the above problem is solved, it is another object to ensure a desired strength at the front portion of the vehicle body.

[0015]

The vehicle body front structure of the present invention for solving the above problems is as follows.

According to the first aspect of the present invention, a pair of left and right front side members 2 and 2 extending in the front-rear direction and the front side members 2 are disposed on the outer sides of the front side members 2 and welded to the outer side surfaces of the front side members 2 by welding S1. The pair of left and right front side member outer panels 3 and the front side members 2 are arranged behind the front side members 2 and extend in the width direction of the vehicle body. Each end portion 4 in the width direction is a rear end portion of each front side member 2. 5, the dash cross member 6 is welded S2 to the end surface of each of the end portions 4 and welded S3 to the front side member outer panel 3, and the dash cross member 6 is disposed behind the dash cross member 6 and extends vertically. In a vehicle body front structure including a dash panel 7 welded to the cross member 6 by S4,

The end portions 4 in the width direction of the dash cross member 6 and the midway portion 32 are separated from each other, and the respective end portions 4a of the end portions 4a are separated from each other by the respective parts of the midway portion 32. The front surface of the stump 32a is joined and welded.

According to the invention of claim 2, in addition to the invention of claim 1, a rear end portion 5 of each of the front side members 2 and a divided end portion 4a of each end portion 4 of the dash cross member 6 are provided. The joining portion 36 is formed by joining them to each other, and the divided end portions 32a of the middle portion 32 of the dash cross member 6 are joined to the joining portion 36.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

Since the present embodiment has a common basic configuration with the conventional technique shown in FIGS. 6 to 8, the common components are designated by the same reference numerals in the drawings and will be described. Is omitted.

1 to 4, each of the front side members 2 is press-molded, and the cross-sectional shape of each part in the longitudinal direction is a U-shape that opens toward the outside of the front part 1 of the vehicle body. There is. Specifically, the front side member 2 includes a vertically oriented plate 18 extending in the up-down direction, and upper and lower face plates 19 integrally extending outwardly from the upper and lower ends of the vertically oriented plate 18, respectively. , 20, outer flanges 21 and 21 integrally extending from the respective extending end portions of the upper and lower bottom plates 19 and 20, and integrally extending from the rear end portion of the vertical plate 18. The outward flanges 21 and 21 are spot-welded to the front side member outer panel 3 by the spot welding S1, and the rear end portion of the upper plate 25 and the outward flange 22 are the ends of the dash cross member 6. Part 4 and spot welding S2
Has been done.

The dash cross member 6 is press-molded, and the cross-sectional shape of each part in the width direction is a U-shape that opens rearward of the front part 1 of the vehicle body. Specifically, the dash cross member 6 includes a vertically oriented plate 24 that extends in the vertical direction, and upper and lower face plates 25 and 26 that extend rearward from the upper and lower ends of the vertically oriented plate 24, respectively. The upper plate 25 extends rearward and the lower plate 26 extends rearward.

Further, the dash cross member 6 is an inward flange extending integrally from each end of the vertically oriented plate 24 and the upper and lower face plates 25, 26 in the width direction of the dash cross member 6. 27 and outwardly facing flanges 28 and 28 integrally extending from the respective extending end portions of the upper and lower bottom plates 25 and 26, and the inwardly facing flanges 27 are spotted on the front side member outer panel 3. Welding S3, and the outward flanges 28, 28 are spot welded S4 with the dash panel 7.
Has been done.

In the above structure, the widthwise ends 4 and 4 of the dash cross member 6 and the ends 4 and 4 are formed.
The intermediate portion 32 located between the two is divided from each other, and the end portions of the respective divided portions 4 and the intermediate portion 32 facing each other are divided end portions 4a and 32a, respectively.

The vertical plate 24 at the divided end 4a of each end 4 of the dash cross member 6 is formed with a through hole 34 in the form of a long hole penetrating in the front-rear direction, and the upper plate 25 is formed in the vertical direction. Another through hole 34 having a long hole shape that penetrates is formed. From the rear of the divided end portion 4a of each end portion 4 of the dash cross member 6 to the divided end portion 3 of the midway portion 32.
2a is fitted, and the divided end portion 4 of each end portion 4 is
The front surface of each of the divided end portions 32a of the intermediate portion 32 is joined to the rear surface of the a, and the opening edge portion of each of the through holes 34, 34 and the vertically oriented plate 24 at the divided end portion 32a of the intermediate portion 32 are joined. The upper plate 25 and the upper plate 25 are joined by arc welding W.

In FIG. 5, when assembling the front part 1 of the vehicle body, first, the front side members 2 are first assembled.
The front side member outer panel 3 is joined to the front side member outer panel 3 by spot welding S1, and each end 4 of the dash cross member 6 is spot welded to the rear end 5 of each front side member 2 and each front side member outer panel 3. The pair of left and right assemblies (2, 3, 4) are formed by combining them by S2 and S3.

On the other hand, the dash panel 7 is joined to the middle portion 32 of the dash cross member 6 by spot welding S4 to form another assembly (7, 32).

Next, as shown by the alternate long and short dash line in FIGS. 3 and 4 and FIG. 5, the other assembly (7, 32) is positioned behind the assembly (2, 3, 4).

Next, the divided end 4a of the end 4 of each dash cross member 6 in the assembly (2, 3, 4).
The rear end of the dash cross member 6 in the other assembly (7, 32) is divided from the rear end thereof.
2a are joined and joined by arc welding W. Then, as shown by the solid lines in FIGS. 1 to 4, the assembly work of the vehicle body front portion 1 is completed.

Here, in the assembling work of the vehicle body front portion 1,
Each welding S1 to S of members to be joined to each other
Both 4 and W can be made easy without being disturbed by other members.

Therefore, in the assembling work of the vehicle body front part 1,
As mentioned above, it is possible first to separately mold the large shaped assemblies (2, 3, 4) and the other assemblies (7, 32) and then to join them together. Therefore, as in the above-described conventional technique, by sequentially connecting the dash cross member 6 and the dash panel 7 having large shapes to the assembly (2, 3), the work of one assembly line can be performed. As compared with the case where the load becomes excessive, the assembling work of the vehicle body front part 1 can be performed more easily.

1 to 4, a part of the rear end portion 5 of each front side member 2 and a part of the divided end portion 4a of each end portion 4 of the dash cross member 6 are joined to each other and joined. Portion 36 is molded. At least a part of each divided end portion 32a of the middle portion 32 of the dash cross member 6 is joined to the joint portion 36.

Therefore, the dash cross member 6 is used.
Has a tendency that its strength is lowered by being divided into its end portion 4 and the midway portion 32, but the joint portion of each of these divided end portions 4a, 32a is connected to the rear end portion 5 of the front side member 2. Will be reinforced by the joining.

Therefore, even if the assembling work of the vehicle body front portion 1 can be made easier by dividing the dash cross member 6 as described above, a desired strength is secured in the vehicle body front portion 1. It

In FIGS. 1 and 3 to 5, the joint portion 36 is formed.
A positioning hole 38 penetrating in the front-rear direction is formed in the front end of the dash cross member 6. A protrusion 39 is provided.

Therefore, as described above, when it is attempted to join another assembly (7, 32) to the assembly (2, 3, 4) in the assembling work of the vehicle body front part 1, the positioning hole is used. If the positioning protrusion 39 is fitted into the shaft 38, the above-mentioned both assemblies can be easily positioned with respect to each other.

Therefore, the assembling work of the vehicle body front portion 1 can be further facilitated by that much.

As shown by the alternate long and short dash line in FIGS.
Another dash cross member 41 may be fixed to the rear surface of the dash panel 7 by welding or the like.

[0039]

The effects of the present invention are as follows.

According to the first aspect of the present invention, a pair of left and right front side members extending in the front-rear direction, and a pair of left and right front members which are arranged on the outer sides of the front side members and are welded to the outer surfaces of the front side members. The side member outer panel and the front side members are arranged behind the front side members and extend in the width direction of the vehicle body. The ends in the width direction are welded to the rear ends of the front side members and the ends of the ends are A dash cross member whose end face is welded to each of the front side member outer panels,
In a vehicle body front structure including a dash panel that is arranged behind the dash cross member and extends in the vertical direction and is welded to the dash cross member,

Each end of the dash cross member in the width direction and an intermediate portion are separated from each other, and a front surface of each of the divided ends of the intermediate portion is provided on the rear surface of the divided end of each end. It is joined and welded.

For this reason, when assembling the front portion of the vehicle body, first, the front side member outer panels are joined to the front side members by welding, and the rear end portions of the front side members are connected to each other. The end portions of the dash cross member are joined to the front side member outer panel by welding to form a pair of left and right assemblies.

On the other hand, a dash panel is welded to the middle portion of the dash cross member to form another assembly.

Next, the divided ends of the dash cross members of the other assembly are joined to the divided ends of the ends of the dash cross members of the assembly from behind. Join by welding. Then,
The assembling work of the front part of the vehicle body is completed.

Here, in the assembling work of the front part of the vehicle body, each welding of the members to be joined together is
It can be facilitated without being disturbed by other members.

Therefore, in the work for assembling the front portion of the vehicle body, as described above, first, the assembly having a large shape,
It is now possible to mold the other assemblies separately and then bond them together, which is why, as in the prior art, the dash cross members, each of which has a larger shape than the assembly, are formed. By sequentially connecting the dash panel and the dash panel, the work load of one assembly line becomes excessive, but the assembly work of the front part of the vehicle body can be performed more easily.

According to a second aspect of the present invention, the rear end of each front side member and the divided end of each end of the dash cross member are joined to each other to form a joint, and the joint is joined to this joint. On the other hand, the divided ends of the middle part of the dash cross member are joined together.

Therefore, the dash cross member is
Although the strength tends to be reduced by being divided into the end portion and the midway portion, the joint portion of each of the divided end portions is reinforced by the joint with the rear end portion of the front side member. .

Accordingly, by dividing the dash cross member, a desired strength can be secured in the front portion of the vehicle body even when the assembling work of the front portion of the vehicle body can be facilitated as described above.

[Brief description of drawings]

FIG. 1 is a partially enlarged view of FIG.

FIG. 2 is a perspective view of a front portion of a vehicle body.

3 is a sectional view taken along the line 3-3 of FIG.

FIG. 4 is a sectional view taken along the line 4-4 of FIG.

5 is an exploded perspective view of what is shown in FIG. 1. FIG.

FIG. 6 is a diagram showing a conventional technique and is a diagram corresponding to FIG. 2;

FIG. 7 is a diagram showing a conventional technique and is a diagram corresponding to FIG. 1.

FIG. 8 is a diagram showing a conventional technique and is a diagram corresponding to FIG. 5;

[Explanation of symbols]

1 vehicle front 2 Front side members 3 Front side member outer panel 4 edges 4a divided end 5 rear end 6 dash cross member 7 Dash panel 32 Midway 32a divided end 34 through hole 36 joint 38 Positioning hole 39 Positioning protrusion S1 to S4 spot welding W arc welding

Claims (2)

[Claims] 1. A pair of left and right front side members extending in the front-rear direction, and a pair of left and right front side member outer panels which are arranged on the outer sides of the front side members and welded to the outer surfaces of the front side members. The front side members are disposed behind the front side members and extend in the width direction of the vehicle body. Each end portion in the width direction is welded to the rear end portion of each front side member, and the end surface of each end portion is the front surface. A front structure of a vehicle body, comprising: a dash cross member welded to an outer panel of a side member; and a dash panel that is arranged behind the dash cross member and extends vertically and is welded to the dash cross member. The widthwise ends of the cross member and the midway portion are separated from each other to separate the ends. The rear surface of the end portion, the vehicle body front structure of an automobile welded by joining the front of the cutting edge of the middle portion. 2. A rear end portion of each front side member and a divided end portion of each end portion of the dash cross member are joined to each other to form a joined portion, and the dash cloth is joined to the joined portion. The vehicle body front structure according to claim 1, wherein each of the divided ends of the member is joined.