JP2751764B2 - Car body front structure - Google Patents

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.

[0002]

2. Description of the Related Art FIG.
5 is known (for a similar structure, see Japanese Utility Model Application Laid-Open No. 59-142179).
In the following description, A indicates the front, B indicates the rear, C indicates the outside (with respect to the vehicle width center), and D indicates the inside (the vehicle width center side).

[0003] Reference numeral 1 denotes a front side member, which is provided on each of the left and right sides of the vehicle body along the front-rear direction (however, the figure shows only the left side as a representative). The front side member 1 has a cross-sectional shape in which the outer side (meaning left and right outer sides with respect to the center of the vehicle width) is open.
It has a hat-shaped cross section provided with 1b, but the other portions are in a state where the lower flange 1b is omitted.

[0004] On the other hand, reference numeral 2 denotes a closing plate which is joined to the upper and lower flanges 1a and 1b of the front side member 1. The closing plate 2 and the front side member 1 constitute a frame member 3 having a closed cross section. ing. A horizontal outward flange 4 is formed at a position corresponding to a portion of the lower end of the closing plate 2 where the lower flange 1b of the front side member 1 is omitted.

[0005] The rear end opening 5 of the frame member 3 thus formed is inclined at an angle corresponding to the slope 6a formed at the lower portion of the vertical dash lower panel 6, and the rear end opening is formed. Flanges 7 and 8 are respectively formed at the rear ends of the front side member 1 and the closing plate 2 corresponding to 5. Further, an extension 11 extending from the dash lower panel 6 to the lower surface of the horizontal floor panel 10 is formed below the side portion 9 of the front side member 1, and the flange 7 of the rear end opening 5 is also extended accordingly. ing. A notch 13 is formed between the outward flange 4 formed at the lower end of the closing plate 2 and the rear end opening 5 to secure a joint allowance for the extension member 12 described later.

A reinforcing plate 14 is provided in the rear end opening 5 of the frame member 3. That is, the reinforcing plate 14 has an upward U-shaped cross-sectional shape having vertical flanges 14a and 14b at the rear side at the inner and outer positions, the outer flange 14b at the front side is omitted, and the rear end has Is a flange 7 of the rear end opening 5,
8 are provided with flanges 15 and 16 to be joined.
The slope 6 a of the dash lower panel 6 is joined to the flanges 7, 8 at the rear end opening 5 of the skeletal member 3 via the flanges 15, 16 of the reinforcing plate 14.

The extension member 12 has a hat shape with an upward cross section.
3 is joined to the closing plate 2 and the side surface 9 of the front side member 1, and the rear side of the dash lower panel 6 is inclined downward and rearward along the inclined surface 6 a of the dash lower panel 6, and then is attached to the floor panel 10. It extends backward along a horizontal state. Therefore, this extension member 12
The front parts of the flanges 17 and 18 on the upper side of the front side member 1 and the closing plate 2
Are joined to the front surface of each of the flanges 7 and 8, and the rear portion is joined to the lower surface of the floor panel 10. In this way, the rigidity of the vehicle body front portion from the engine room in front of the dash lower panel 6 to the lower surface of the floor panel 10 is ensured.

[0008]

However, on the other hand,
In order to further improve the rigidity of such a vehicle body structure, a substantially L-shaped outrigger 19 is provided outside the frame member 3.
The cross member called "outrigger 1"
According to No. 9, there is a plan to connect the skeletal member 3 to a side sill (not shown) having a closed sectional structure outside the skeletal member 3.

However, when the outrigger 19 is to be retrofitted to the skeletal member 3, the front end 12a of the extension member 12 is joined on the closing plate 2, which is the other side of spot welding, so as to form a step. If it is difficult to further weld the outrigger 19 thereon, and if the outrigger 19 is to be welded to the closing plate 2 in advance, the extension member 12 cannot be welded to the closing plate 2 anyway. In this case, this type of outrigger 19 cannot be mounted.

Further, in the conventional structure, even if the outrigger 19 can be mounted, the outrigger 1
Since no structural consideration is given to the lateral input applied to the skeletal member 3 from the
When a large input is added from the input, the input may not be efficiently received. Therefore, it is necessary to increase the plate thickness of the frame member 3 to increase rigidity, which is disadvantageous in terms of weight and cost.

The present invention has been made in view of such prior art, and provides a front structure of a vehicle body in which a cross member can be attached and an input from the cross member can be efficiently received. It is.

[0012]

In order to achieve the above object, a front structure of a vehicle body according to the present invention has a closing plate joined to an opening edge of a substantially U-shaped front side member opened outward. Forming a skeletal member having a closed cross-section, providing a reinforcing plate to be joined to the side and bottom portions of the front side member and the closing plate in the rear end opening of the skeletal member joined to the dash lower panel; An extension member extending forward and joined to the lower surface of the floor panel is connected to a lower rear end of the skeletal member, and a cross member comprising a horizontal portion and a vertical portion and extending outward is connected to the closing plate. At the lower end of the closing plate, an outward flange, which is located at substantially the same height as the bottom surface of the front side member, is And a horizontal flange joined to the lower surface of the outward flange is formed on the extension member, and the horizontal portion of the cross member is joined to the upper surface of the outward flange. Things.

[0013]

According to the front structure of the vehicle body according to the present invention,
At the lower end of the closing plate, an outward flange which is substantially at the same height as the bottom surface of the front side member is formed continuously to the rear end opening along the longitudinal direction and is joined to the lower surface of the outward flange at the extension member. Since the horizontal flange is formed, the closing plate is in a flat state, and the cross member extending outward can be easily connected.

Further, since the horizontal portion of the cross member is joined to the upper surface of the outward flange, the horizontal portion and the bottom portion of the front side member are located at substantially the same height, so that inward input from the cross member can be achieved. On the other hand, the bottom portion acts as a kind of “refill” so that the input can be efficiently received.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to FIGS.
It will be described based on. In addition, the same reference numerals are given to portions common to the related art, and overlapping description will be omitted.

Hereinafter, each member will be described in order. Front side member 20: Front side member 20
As in the prior art, the upper flange 20a is formed continuously along the front-rear direction, but the lower flange 20b is only the front end, and the other portions are omitted. A dash lower panel 6 is provided on a side surface portion 22 corresponding to the rear end opening 21.
The flange 23 to be joined to the slope 6a is formed. A cutout 25 is formed near the rear end of the bottom surface 24, and is narrower than the front end. In addition, a rear end flange 27 is formed at the rearmost end of the narrowed bottom portion 24 via an inclined portion 26 which rises slightly rearward.

Closing plate 28: A horizontal outward flange 29 continues to the rear end opening 21 in a range corresponding to a portion of the lower end of the closing plate 28 where the lower flange 20b of the front side member 20 is omitted. It is formed. The rearmost portion of the outward flange 29 is provided at the inclined portion 26 of the front side member 20.
It is slightly uphill in accordance with. In addition, a terminal portion corresponding to the rear end opening 5 of the closing plate 28 includes:
A flange 30 joined to the slope 6a of the dash lower panel 6 is formed, and a vertical flange 31 joined to a vertical portion of the dash lower panel 6 is formed continuously at an upper end of the flange 30. With the closing plate 28 and the front side member 20,
A skeleton member 32 having a closed cross section is formed.

Reinforcement plate 33: The front side of the reinforcement plate 33 is wide, but the rear side is narrower with the outer side offset. A vertical flange 34 joined to the side surface 22 of the front side member 20 is formed on the front side of the reinforcing plate 33, and a vertical flange 35 joined to the closing plate 28 is formed on the rear side thereof. At the rearmost end of the reinforcing plate 33, a sloped portion 36 and a horizontal flange 37 corresponding to the rearward flange 27 and the inclined portion 26 formed at the rearmost end of the front side member 20 are formed.

Extension member 38: A horizontal flange 39, which is joined to the lower surface of the outward flange 29 of the closing plate 28, is formed near the front side outside the extension member 38. The rear side of the horizontal flange 39 is slightly inclined upward corresponding to the inclined portion 26 of the front side member 20. And this horizontal flange 3
Another flange 40 joined to the lower surface of the floor panel 10 is continuously formed on the rear side of the 9. On the other hand, the inside front portion of the extension member 38 is a vertical wall 41 joined to the side surface 22 of the front side member 20, and the rear side of the vertical wall 41 is formed on the side surface 22 of the front side member 20. A flange 42 to be joined to the front surface of the formed flange 23 is formed, and a flange 43 corresponding to the outer flange 40 is formed at the rear end of the flange 42. At the front end of the extension member 38, a horizontal front end flange 44 joined to the lower surface of the bottom portion 24 of the front side member 20 is also formed.

Outrigger (cross member) 45: The outrigger 45 has an L-shaped cross section including a horizontal portion 46 and a vertical portion 47, and the outside of the vertical portion 47 is slightly curved. Horizontal part 46 from outermost end
A flange 48 is formed over a part of the outermost end of the slab to be joined to a side sill (not shown) having a closed sectional structure.
On the other hand, the closing plate 2
8, a forward facing flange 49 is formed. The inner edge 50 of the horizontal portion 46 is formed with an outward flange 29 formed at the lower end of the closing plate 28.
The inner edge 50 also has an upward flange 51 joined to the closing plate 28. At the rear end of the horizontal portion 46, an inclined portion 52 corresponding to the inclined portion 26 of the front side member 20 is also formed.

Assembly procedure: Next, the procedure for assembling these members will be described. Incidentally, S ₁ to S ₁₀ are show spot welding points, which shows as a representative illustration only important point, the actual points required in addition to these S ₁ to S ₁₀ spot welding Is given.

A) Closing plate 28 + outlet
Gir 45: First, the outrigger 45 is joined to the closing plate 28 in advance. The bonding procedure, as described above, by placing the inner edge 50 of the horizontal portion 46 of the outrigger 45 on the upper surface of the outward flange 29 of the closing plate 28 is welded at S _1, an upward horizontal portion 46 of the outrigger 45 a flange 51 and a closing plate 28 welded at S _2. Also, a forward flange 49 and the closing plate 28 in the vertical portion 47 welded in S _3. With this, outrigger 4
The connection between 5 and the closing plate 28 is completed.

B) Front side member 20 + reinforcing plate
Port 33 + extension member 38: Next, the front side member 20 side is assembled. That is, the reinforcing plate 3
Put 3 in the front side member 20, and a bottom portion 24 of the reinforcing plate 33 and the front side member 20 is welded at S _4, S _5, respectively, the side surface portion 22 of the front vertical flange 34 and the front side member 20 To S ₆
Weld in advance. Further, the extension member 38 is set from the lower side at the rear end of the front side member 20, the front end flange 44 of the extension member 38 is welded to the bottom surface 24 of the front side member 20 at S ₄ , and the inner vertical wall 41 is formed. keep welded S ₈ to the side surface portion 22 of the front side member 20.

C) Final assembly (A + B): Finally, the assembled A group and B group are assembled.
That is, the welded at the same position as the S ₁ put the outward flange 29 of the closing plate 28 on the horizontal flange 39 of the extension member 38, the reinforcing plate 33
The vertical flange 35 outside the closing plate 28
The welded to the same position as S ₂ of. Then, the upper and lower flanges 20a and 20b of the front side member 20 are joined to corresponding positions of the closing plate 28 by a predetermined number of spot welds (not shown) to form the frame member 32. The dash lower panel 6 is attached to the flanges 23 and 30 of the rear end opening 21 of the frame member 32 assembled in this manner.
Of the closing plate 28, the vertical portion 31 of the closing plate 28 is joined to the dash lower panel 6 in the vertical portion, and the extension members 38 are joined to the rear end flanges 40, 43 of the floor panel 10. It is.

In the structure assembled in this manner, the closing plate 28 to which the outrigger 45 is attached has a flat surface.
5 can be easily joined. As shown in FIG. 3, the horizontal portion 46 of the outrigger 45 and the bottom portion 24 of the front side member 20 are at substantially the same height position, and both are connected via the reinforcing plate 33. Therefore, even if the input F ₁ inward from the outrigger 45 applied, will be the bottom part 24 and the reinforcing plate 33 to act as a "jamming" of one to the input F _1, the input F ₁ efficiency It becomes possible to receive well. Moreover, the site where the input F ₁ from the outrigger 45 is applied, the corner portion 3 of the reinforcing plate 33
8a is located (see FIG. 3), so that the skeleton member 32
Increased rigidity of, resistance to the input F ₁ increases.

Further, since the outward flange 29 formed at the lower end of the closing plate 28 is formed continuously from near the front of the closing plate 28 to the rear end opening 21, the rearwardly facing flange 29 is formed on the frame member 32. be subjected to any input F ₂ was difficult to deformation. Conventionally, since the outward flange 29 was cut at the rear end, the portion became a trigger and was easily deformed.

[0027]

The front structure of the vehicle body according to the present invention
With the contents as described above, an outward flange which is located at substantially the same height as the bottom surface of the front side member at the lower end of the closing plate is formed continuously to the rear end opening along the longitudinal direction. Since the extension member has a horizontal flange joined to the lower surface of the outward flange, the closing plate is in a flat state, so that the cross member extending outward can be easily connected.

Further, since the horizontal portion of the cross member is joined to the upper surface of the outward flange, the horizontal portion and the bottom portion of the front side member are located at substantially the same height position, so that inward input from the cross member can be achieved. On the other hand, the bottom portion functions as a kind of “replacement” so that the input can be efficiently received.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a front structure of a vehicle body according to one embodiment of the present invention.

FIG. 2 is a diagram showing an assembly drawing of a front structure of a vehicle body according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along line SA-SA shown in FIG.

FIG. 4 is a partially exploded perspective view showing a conventional front structure of a vehicle body.

FIG. 5 is a sectional view taken along line SB-SB shown in FIG. 4;

[Explanation of symbols]

6 Dash lower panel 10 Floor panel 20 Front side member 21 Inside rear end opening 22 Side part of front side member 24 Bottom part of front side member 28 Closing plate 29 Outward flange 32 Frame member 33 Reinforcement plate 38 Extension member 39 Horizontal flange 45 Outrigger (cross member) 46 outrigger horizontal portion 47 outrigger vertical section F ₁ inward input F ₂ backward input C outer (cross member) of the (cross member)

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-1-275277 (JP, A) JP-A-2-7076 (JP, U) JP-A-59-74170 (JP, U) JP-A-4- 81888 (JP, U) Actually open sho 59-142179 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B62D 25/00-25/22

Claims (1)

(57) [Claims] 1. A closing plate is joined to an opening edge of a substantially U-shaped front side member opened outward to form a skeleton member having a closed cross section, and a rear end opening of the skeleton member joined to a dash lower panel is formed. A reinforcing plate that is joined to the side and bottom portions of the front side member and the closing plate, and further connects an extension member that extends forward to a lower rear end of the skeletal member and is joined to the lower surface of the floor panel. And connecting a cross member comprising a horizontal portion and a vertical portion and extending outwardly to the closing plate, wherein the lower end of the closing plate faces outward at substantially the same height as the bottom portion of the front side member. Along with forming the flange continuously to the rear end opening along the longitudinal direction,
A front structure of a vehicle body, wherein a horizontal flange joined to a lower surface of the outward flange is formed on the extension member, and a horizontal portion of the cross member is joined to an upper surface of the outward flange.