JP2000128023A - Automobile front body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and matching at polymerization in the spot joining of a flange on the upper edge of a dash lower panel to a dash upper panel and a cowl top panel. SOLUTION: A flange 2 on the upper edge of a dash lower panel 1 is formed so as to be inclined upward within a surface F of substantially the same inclination, in the direction of the body width. As a result, there is good matching between this flange 2 and a dash upper panel 7 and a cowl top panel 8. Further, it is possible to spot weld while moving in the direction of the body width without changing the inclination of a spot welding gun, so that the workability in spot welding is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front structure of a vehicle body of an automobile, and more particularly to a structure around a joint between a dash lower panel and a cowl box joined to an upper edge of the dash lower panel.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a structure around a joint between a conventional dash lower panel and a cowl box.
The upper edge of the dash lower panel 20 is formed by bending a flange 21 horizontally toward the front, and the front end of a dash upper panel 23 constituting the cowl box 22 and the lower end of the cowl top panel 24 are formed on the flange 21. Polymerized and joined by spot welding.

Since various components in the engine room and components in the vehicle compartment are mounted on the dash lower panel 20, the component mounting portion near the upper edge of the dash lower panel 20 protrudes upward to secure a component mounting area. In a vehicle in which the extended portions 25A and 25B are formed, and in which a brake master back 26, which is a brake system component, is arranged higher than a strut tower (not shown) located in front of the brake master back 26, the brake master back 26 is arranged. Since the extension portion 25A to which is mounted requires a relatively large mounting area for the brake master back 26, the upward projecting height is increased.

For this reason, the upper edge of the dash lower panel 20 is formed as a step by connecting the connecting portions of the expansion portions 25A and 25B with the oblique side 27, and the flange 21 is formed along this step shape. , Dash upper panel 23
And the lower end of the cowl top panel 24 are formed in a step-like manner in accordance with the step of the flange 21. In FIG. 9, reference numeral 28 denotes a front window panel.
This similar structure is disclosed, for example, in Japanese Utility Model Laid-Open No. 4-58460.

[0005]

As described above, the flange 21 on the upper edge of the dash lower panel 20, the dash upper panel 23 and the cowl top panel 2 joined to the flange 21 are connected to the flange 21.
Since the joining portions of No. 4 are formed in a stepped shape, the directions of spot welding are not uniform between the horizontal portion and the oblique side 27 when viewed from the front, which makes it difficult to perform spot welding.

A flange 21 on the upper edge of the dash lower panel 20 and a dash upper panel 23 joined to the flange 21
In addition, it is difficult to perform molding by completely matching the step shape of each joint portion of the cowl top panel 24, and a molding error is inevitably generated. In this case, if the step shapes are partially aligned, for example, FIG. As schematically shown in FIG. 2, a gap C may be formed in another portion, so that spot welding cannot be performed reliably and the joining strength may be insufficient.

Accordingly, the present invention can improve the workability of spot joining between the upper edge flange of the dash lower panel and the dash upper panel and the cowl top panel which are superimposed on the flange, and ensure that the superposed portion has good consistency. An object of the present invention is to provide a vehicle body front structure that can be spot-welded and can increase joining strength.

[0008]

According to the first aspect of the present invention, a cowl top panel and a dash upper panel constituting a cowl box are superimposed on a flange bent forward and formed on an upper edge of a dash lower panel. In the above structure, the flange at the upper edge of the dash lower panel is formed to be inclined upward in substantially the same inclined plane over the vehicle width direction.

According to the second aspect of the present invention, a dash-lower panel according to the first aspect is provided with an extended portion which projects upward and bulges forward at a predetermined portion, and the extended portion has a brake system. It is characterized by attaching parts.

[0010]

According to the first aspect of the present invention, since the flange of the upper edge of the dash lower panel is formed to be inclined upward in substantially the same inclined plane over the vehicle width direction,
Even when the flange is formed with a step in the vehicle width direction, when spot-welding the flange, the cowl top panel and the dash upper panel, the spot gun can be moved along the inclination of the flange without changing its inclination without changing its inclination. Since the spot welding can be performed simply by moving in the direction, the joining operation can be easily performed.

Further, since the flange, the cowl top panel and the dash upper panel can be superposed on substantially the same inclined plane in the vehicle width direction, the alignment is good, and the panel mutual error due to panel forming error as in the prior art. Are not separated from each other, spot welding can be surely performed, and the joining strength can be increased.

Further, since the flange is formed to be inclined upward in substantially the same inclined plane in the vehicle width direction, the formability of the dash lower panel is good, and the portion corresponding to the flange is easily formed. As a result, the moldability of the cowl top panel and the dash upper panel is improved, which can greatly contribute to cost reduction.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the effects of the invention of the present invention, since the extended portion formed to protrude upward at a predetermined portion of the dash lower panel is formed to bulge forward, the flange is also formed at the upper edge portion of the extended portion at the other portion. In the same manner as described above, the flange and the cowl can be accommodated in substantially the same inclined surface across the vehicle width direction, even if the extension has a large upward height for mounting the brake system component. The spot welding workability with the top panel and the dash upper panel, the consistency of the overlapped portion, and the formability of each panel are not impaired.

Further, even if the expansion portion is formed to bulge forward, the flange at the upper edge is formed so as to be inclined upward, and the amount of forward projection of the flange is reduced by the conventional flange which is horizontally extended. Since it can be made relatively small, it is possible to reduce the distance in the front-rear direction between the brake master back, which is a brake system component mounted on the front of the extension, and the end of the flange. Even if it is bulged, it is possible to suppress an increase in the forward protrusion amount of the brake master back, and it is possible to avoid an increase in the space occupied in the engine room.

Further, a brake pedal unit is mounted on the rear surface of the extension, that is, on the side surface on the vehicle compartment side, in direct connection with the brake master back, but the extension is bulged forward. The brake pedal unit can be arranged to be shifted to the front of the cabin by the amount of the expansion of the extension,
Therefore, the foot space in the vehicle compartment can be widened and the livability can be improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a dash lower panel, on the upper edge of which a flange 2 for joining and disposing a cowl box 6 is formed.

As will be described later, the flange 2 is formed so as to be inclined upward in a substantially uniform inclined plane F at a required angle in the vehicle width direction.

Since various components in the engine room and components in the vehicle compartment are mounted on the dash lower panel 1, the component mounting portion near the upper edge of the dash lower panel 1 projects upward to secure a component mounting area. Extension 3
A and 3B are formed. In particular, a brake master back 4 which is a brake system component is disposed higher than a strut tower (not shown) located in front of the brake master back 4. The extended portion 3A requires a relatively large mounting area for the brake master back 4, so that the protruding height is increased.

As described above, the flange 2 is formed to be inclined in the inclined plane F having substantially the same required angle in the vehicle width direction.
Is present, the flange 2 is displaced upward from the inclined surface F at the upper edge portion of the extended portion 3A, so that the extended portion 3A is located forward, that is, in the engine room E ·.
The expanded portion 3A is formed by bulging toward the R side.
The flange 2 at the upper edge portion is substantially aligned with the inclined surface F.

This will be described in detail with reference to model diagrams shown in FIGS. 5 to 8. Since the extended portion 3A is formed to protrude relatively large above the dash lower panel 1 as described above, the extended portion 3A is dashed. General surface 1 of lower panel 1
When formed on the same plane as a, as shown by a broken line in FIG. Therefore, the extended portion 3A is moved by the interval S to the general surface 1a.
The flange 2 can be aligned with the inclined surface F even at the upper edge portion of the expanded portion 3A by bulging forward from the front.

The brake master back 4 is mounted on the front surface of the thus formed extension portion 3A, and the bracket 5A of the brake pedal unit 5 directly connected to the brake master back 4 is mounted on the rear surface via a spacer 12. It is. 5B shows a pedal arm.

On the other hand, in this embodiment, the cowl box 6 is of a front overhang type that projects forward from the dash lower panel 1.

The front edge flange 7a of the dash upper panel 7 and the rear edge flange 8a of the cowl top panel 8 constituting the cowl box 6 are overlapped with the upper edge flange 2 of the dash lower panel 1 and joined by spot welding. .

Rear edge flange 7 of dash upper panel 7
b, a rear edge flange 9a of the cowl top center 9 is overlapped and joined by spot welding.

Further, the cowl top front 10 is joined by spot welding over the front edge flange 9b of the cowl top center 9 and the bottom wall of the cowl top panel 8, thereby forming an open cowl structure.

Therefore, the front edge flange 7a of the dash upper panel 7 and the rear edge flange 8a of the cowl top panel 8 are formed in accordance with the step shape and the inclination angle of the flange 2 at the upper edge of the dash lower panel 1. . 3 and 4, reference numeral 11 denotes a front window panel.

According to the structure of the above embodiment, the flange 2 at the upper edge of the dash lower panel 1 is formed to be inclined upward in substantially the same inclined plane F over the vehicle width direction. Even when the flange 2 is formed with a step in the vehicle width direction, when the flange 2 is spot-welded to the front edge flange 7a of the dash upper panel 7 and the rear edge flange 8a of the cowl top panel 8, a spot (not shown) Spot welding can be performed by simply moving the gun in the vehicle width direction along the inclination of the flange 2 without changing its inclination, so that the joining operation can be easily performed.

The front edge flange 7a of the flange 2 and the dash upper panel 7 and the cowl top panel 8
Since the rear edge flange 8a can be overlapped in the substantially same inclined surface F over the vehicle width direction, the matching is good,
Since the panels are not separated from each other due to a panel forming error as in the related art, spot welding can be reliably performed, and the joining strength can be increased.

Further, since the flange 2 is formed to be inclined upward in substantially the same inclined plane F over the vehicle width direction, the formability of the dash lower panel 1 is good, and a portion corresponding to the flange 2 is provided. That is, since the front edge flange 7a of the dash upper panel 7 and the rear edge flange 8a of the cowl top panel 8 can be easily formed, the formability of the dash upper panel 7 and the cowl top panel 8 is improved, and the cost is reduced. Can be greatly contributed to.

Particularly, in this embodiment, an extension 3A for mounting the brake system components 4 and 5 is provided at a predetermined portion of the dash lower panel 1 so as to protrude relatively large upward. Is, for example, the dimension S shown in FIG.
Bulging forward by the amount of
In the upper edge portion, the flange 2 can be accommodated in substantially the same inclined surface F across the vehicle width direction as the flange 2 in the other portions, so that the flange 2 and the front edge flange 7a of the dash upper panel 7 and The spot welding workability and consistency with the rear edge flange 8a of the cowl top panel 8 and the formability of each panel are not impaired.

Further, even if the extension portion 3A is formed to bulge forward, the flange 2 at the upper edge thereof is formed so as to be inclined upward, and the amount of protrusion of the flange 2 to the front is extended horizontally. Because it can be smaller than the conventional flange,
As shown in FIG. 4, the distance between the brake master back 4 mounted on the front surface of the extension 3A and the end of the flange 2 can be narrowed, so that the extension 3A moves forward as described above. Even if it is formed by bulging, it is possible to suppress an increase in the amount of forward projection of the brake master back 4, and it is possible to avoid an increase in the occupied space in the engine rooms E and R.

Further, a cabin R on the rear side of the extension 3A
A brake pedal unit 5 directly connected to the brake master back 4 is mounted on the inner side surface.
Since A is bulged forward, as described above, the brake pedal unit 5 can be displaced toward the front of the passenger compartment by the swelling amount S of the extended portion 3A. The foot space in the R can be widened and the comfort can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an assembled state of FIG. 1;

FIG. 3 is a cross-sectional view corresponding to a portion viewed in the direction of arrow A in FIG. 1;

FIG. 4 is a cross-sectional view corresponding to a portion viewed from the arrow B in FIG. 1;

FIG. 5 is a model perspective view of an extension molded portion of the dash lower panel.

FIG. 6 is a front view of the model diagram of FIG. 5;

FIG. 7 is a plan view of the model diagram of FIG. 5;

FIG. 8 is a side view of the model diagram of FIG. 5;

FIG. 9 is an explanatory sectional view schematically showing a conventional structure.

FIG. 10 is a front view schematically showing a conventional structure when viewed from the front of a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dash lower panel 2 Flange F Inclined surface 3A Expansion part 4, 5 Brake system parts 6 Cowl box 7 Dash upper panel 8 Cowl top panel

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Naoki Ito 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa F-term in Nissan Motor Co., Ltd. (reference) 3D003 AA10 AA12 AA14 AA18 BB02 CA05 CA07 DA08

Claims (2)

[Claims] 1. A structure in which a cowl top panel and a dash upper panel constituting a cowl box are superposed and joined to a flange bent forward and formed on an upper edge of a dash lower panel, wherein the flange at the upper edge of the dash lower panel is provided. The vehicle body front structure of an automobile, characterized in that it is formed to be inclined upward in substantially the same inclined plane over the vehicle width direction. 2. An extended portion projecting upward at a predetermined portion of the dash lower panel and bulging forward is formed,
The vehicle body front structure according to claim 1, wherein a brake system component is attached to the extension portion.