JPH08310446A - Body front structure of automobile - Google Patents

Abstract

PURPOSE: To dispense with the rust and water proofing processes of a toe board installed part and provide such a dash panel as being high in panel rigidity. CONSTITUTION: A first member 2 integrally made up of a vertical wall part 4 of a dash-panel 1 and a dash upper part 5 forming the under surface side of a cowl box 6, and a second member 3 integrally made up of another vertical wall part 8 and a toe board 9 of the dashpanel 1 both are joined together after superposing the vertical wall part 8 of the second member 3 on the backside of the vertical wall part 4 of the first member 2, whereby an extent of panel rigidity is heightened as a multipanel structure, thereby dispensing with the rust and water proofing processes of a toe board installed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle body front structure,
In particular, the present invention relates to a structure around a dash panel that separates an engine room and a vehicle compartment.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional structure around a dash panel. Reference numeral 20 denotes a dash panel which separates an engine room E / R from a vehicle compartment R. The dash panel 20 has a vertical wall portion 21. The dash upper portion 22 that constitutes the lower surface side of the cowl box 24 is integrally formed.

The dash panel 20 is thus provided with the vertical wall portion 2
Since 1 and the dash upper part 22 are integrally molded,
The toe board 23 is separately formed in consideration of the formability of the dash panel 20 and the plate yield, and the upper end of the toe board 23 is joined to the lower surface of the flange 21a that is bent obliquely backward in the lower end of the vertical wall portion 21. Then, a cowl top panel 25 having an inverted L-shaped cross section is joined to the dash upper portion 22 to form a cowl box 24 having a closed cross section.

This similar structure is disclosed, for example, in Japanese Patent Laid-Open No. 04-29.
No. 3612.

[0005]

Since the upper end of the toe board 23 is exposed to the outside upward, the upper end of the toe board 23 is both rustproof and waterproof at the connecting portion between the upper end and the flange 21a. The paint seal 26 and the like need to be rustproofed and waterproofed, which leads to an increase in cost.

Further, since the dash panel 20 is a single panel, the vehicle compartment R of the vertical wall portion 21 at the time of a frontal collision of the vehicle.
In order to suppress the amount of deformation to the side to a small extent, a dedicated reinforcing member is required, which inevitably increases costs.

Further, the flange 21 at the lower edge of the vertical wall portion 21
Since the upper end of the toe board 23 is joined to the lower surface of a,
It is undeniable that the collision load acting on the vertical wall portion 21 at the time of a frontal collision of the vehicle acts on the joint portion between the flange 21a and the upper end portion of the toe board 23 in the peeling direction, which is disadvantageous in terms of strength.

Therefore, the present invention does not require anti-corrosion and waterproofing of the toe board connecting portion, and the panel rigidity can be enhanced without using a dedicated reinforcing member, so that the panel can be deformed toward the passenger compartment during a frontal collision of the vehicle. (EN) Provided is a vehicle body front structure capable of suppressing the amount to be small.

[0009]

According to a first aspect of the present invention, a first member integrally formed with a vertical wall portion of a dash panel and a dash upper portion forming a lower surface side of a cowl box, and a vertical wall of the dash panel. The second member integrally formed with the toe board is characterized in that the vertical wall portion of the second member is superposed and joined to the back surface of the vertical wall portion of the first member.

According to a second aspect of the present invention, the lower end portion of the cowl top panel forming the upper surface side of the cowl box according to the first aspect and the upper end portion of the vertical wall portion of the second member are vertically connected to the first member. The feature is that the walls are sandwiched and polymerized and joined.

A third aspect of the present invention is characterized in that an insulator is interposed between the vertical wall portion of the first member and the vertical wall portion of the second member according to the first and second aspects.

[0012]

According to the first aspect of the present invention, since the toe board is integrally formed with the vertical wall portion of the second member, no rust prevention or waterproofing treatment is required for the toe board continuous portion, and the vertical direction of the first member is eliminated. The vertical wall portion of the second member is superposed and joined to the back surface of the wall portion, and the lower end of the vertical wall portion of the first member faces downward so as to be inconspicuous from the outside. Since no waterproofing is required, it is possible to reduce the number of work steps.

Also, since the vertical wall portion of the first member and the vertical wall portion of the second member can form a multiple panel structure, the panel rigidity can be increased and the amount of deformation of the dash panel toward the passenger compartment in the case of a vehicle front collision. Can be suppressed to be small.

Further, the collision load at the time of a frontal collision of the vehicle acts on the joint portion between the vertical wall portion of the first member and the vertical wall portion of the second member in the pressure contact direction or the shearing direction which is advantageous in terms of strength. The panel rigidity of the panel can be further increased.

According to the second aspect, since the vertical wall portion of the first member is sandwiched and joined by the lower end portion of the cowl top panel and the upper end portion of the vertical wall portion of the second member, these first member, second It is possible to reduce the number of joining steps of the member and the cowl top panel and to enhance the joining strength.

According to the third aspect, since the sound insulation / heat insulation structure can be formed on the dash panel itself, there is no need for a troublesome work of separately installing an insulator on the vehicle cabin side surface of the dash panel in a fitting process. The work man-hours and parts management man-hours can be reduced, and the cost can be reduced.

[0017]

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

1 and 2, 1 is an engine room E
A dash panel that separates the R and the passenger compartment R, and is composed of the first member 2 and the second member 3.

The first member 2 is a vertical wall portion 4 of the dash panel 1.
And the dash upper portion 5 forming the lower surface side of the cowl box 6 are integrally formed, and the cowl top panel 7 having an inverted L-shaped cross section forming the upper surface side of the cowl box 6 is joined to the dash upper portion 5. The cowl box 6 having a closed cross section is configured.

The second member 3 is a vertical wall portion 8 of the dash panel 1.
And the toe board 9 are integrally formed, and the vertical wall portion 8 is firstly formed.
The back surface of the vertical wall portion 4 of the member 2 is superposed and joined, and the floor panel 11 is superposed and joined on the rear end portion of the toe board 9.

In the present embodiment, these vertical wall portions 4 and 8 are joined in the middle with an insulator 10 such as a foamed mel sheet interposed therebetween, and the lower end portion of the cowl top panel 7 and the vertical portion of the second member 3 are joined together. The upper end portion of the wall portion 8 is joined as a three-panel stack by sandwiching the portion where the dash upper portion 5 of the vertical wall portion 4 of the first member 2 is continuously provided.

According to the structure of the above embodiment, the toe board 9
Since it is integrally molded with the second member 3, the conventional rustproofing and waterproofing treatment of the toe board joint is completely unnecessary.

Further, the second member is provided on the back surface of the vertical wall portion 4 of the first member 2.
The vertical wall portion 8 of the member 3 is superposed and joined, and the lower end of the vertical wall portion 4 of the first member 2 faces downward so that it is inconspicuous from the outside, and the lower end portion is rust-proofed and waterproofed. Since it is unnecessary, the work man-hour can be reduced.

On the other hand, in terms of strength, since the vertical wall portion 4 of the first member 2 and the vertical wall portion 8 of the second member 3 can form a multiple panel structure, the panel rigidity can be increased and the engine at the time of a frontal collision of the vehicle. It is possible to reduce the amount of deformation of the dash panel 1 toward the vehicle compartment R side due to the backward movement of the parts in the room.

Further, since the first member 2 and the second member 3 are joined to each other by the vertical surfaces of the vertical wall portions 4 and 8, the collision load at the time of a frontal collision of the vehicle has a collision load of these vertical wall portions 4 and 8. At the initial stage of collision, the joint portion acts in the pressure contact direction, and when the vertical wall portions 4 and 8 are bent in a dogleg shape, the joint portion acts in a shearing direction advantageous in terms of strength. It is possible to further prevent the peeling phenomenon from 3 and further enhance the panel rigidity of the dash panel 1.

Further, according to this embodiment, the cowl top panel 7 and the vertical wall portion 8 of the second member 3 have a first lower end portion and a lower end portion.
Since the vertical wall portion 4 of the member 2 is sandwiched and joined, the man-hours for joining the first member 2, the second member 3 and the cowl top panel 7 can be reduced, and the joint strength is increased to increase the panel of the dash panel 1. The rigidity can be further increased.

Moreover, since the insulator 10 is interposed between the vertical wall portions 4 and 8 and joined to each other to form a sound-insulating and heat-insulating structure on the dash panel 1 itself, a passenger compartment R of the dash panel 1 can be separately prepared in a fitting process. There is no need for the troublesome work of tensioning the insulator on the side surface.

[0028]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, since the toe board is integrally formed with the vertical wall portion of the second member, there is no need for the conventional rust prevention and waterproof treatment of the toe board joint portion.
The vertical wall portion of the second member is superposed and joined to the back surface of the member, and the lower end of the vertical wall portion of the first member faces downward so as to be inconspicuous from the outside, and rustproof and waterproof of the lower terminal portion. Since no treatment is required, it is possible to reduce the number of work steps and contribute to cost reduction.

Also, since the vertical wall portion of the first member and the vertical wall portion of the second member can form a multiple panel structure, the panel rigidity can be increased and the amount of deformation of the dash panel toward the passenger compartment in the case of a vehicle front collision. Can be suppressed to be small.

Furthermore, since the first member and the second member are joined to each other on the vertical surfaces of the vertical wall portions, the collision load at the time of a vehicle frontal collision is applied to the joint portions of these vertical wall portions in the pressure contact direction or strength. Since it acts in an advantageous shearing direction, the panel rigidity of the dash panel can be further increased, and the effect of suppressing panel deformation toward the vehicle interior can be enhanced.

According to the second aspect, since the vertical wall portion of the first member is sandwiched and joined with the lower end portion of the cowl top panel and the upper end portion of the vertical wall portion of the second member, these first member and the vertical wall portion are joined together. The number of steps for joining the second member and the cowl top panel can be reduced, and the joining strength can be enhanced to further enhance the panel rigidity of the dash panel.

According to the third aspect, since the sound insulation and heat insulation structure can be formed on the dash panel itself, there is no need for a troublesome work of separately installing an insulator on the side surface of the dash panel on the passenger compartment side in a fitting process. In addition, it is possible to reduce the number of man-hours and man-hours required for parts management, which can greatly contribute to cost reduction.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional structure.

[Explanation of symbols]

 1 Dash panel 2 1st member 3 2nd member 4 Vertical wall part of 1st member 5 Dash upper part 6 Cowl box 7 Cowl top panel 8 Vertical wall part of 2nd member 9 Toe board 10 Insulator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiji Kikuchi 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (3)

[Claims] 1. A first member integrally formed with a vertical wall portion of a dash panel and a dash upper portion forming a lower surface side of a cowl box, and a second member integrally formed with the vertical wall portion of the dash panel and a toe board. The vehicle body front structure, wherein the vertical wall portion of the first member is superposed on and joined to the back surface of the vertical wall portion of the first member. 2. A lower end portion of a cowl top panel forming an upper surface side of a cowl box and an upper end portion of a vertical wall portion of a second member are overlapped with each other by sandwiching the vertical wall portion of the first member to be joined together. The vehicle body front structure according to claim 1, which is characterized in that. 3. The vehicle body front structure according to claim 1, wherein an insulator is interposed between the vertical wall portion of the first member and the vertical wall portion of the second member.