JP2549257Y2 - 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 front structure of a vehicle body, and more particularly to a structure of a partition between a vehicle compartment and an engine room.

[0002]

2. Description of the Related Art As shown in FIG. 4, a front portion of a vehicle room R is separated from an engine room by a dash panel 1. The both side edges of the dash panel 1 are welded to the left and right front pillars, and the lower edge bent and extended rearward is the front floor 2.
Welded to the leading edge of

On the other hand, a cowl 5 having both ends connected to left and right front pillars is provided along the lower end of a front window 3 provided with a windshield 4, and the upper end of a dash pannel 1 is welded to the front surface thereof. I have. Furthermore,
In the cowl 5, in particular, the upward-opening cowl as shown, a reinforcement 6 having both ends connected to the left and right front pillars is welded to the rear surface to enhance rigidity.

By the way, the dash panel 1 is located in a place that is easily affected by engine vibration, and vibration is transmitted from the engine support portion and the underbody member, and the dash panel 1, cowl 5, front floor 2, and windshield 4 resonate. , Causing a muffled sound in the cabin R. The broken line in the figure indicates the body resonance model.

In order to prevent the occurrence of body resonance of the cowl-dash panel system, a reinforcement 9 having an L-shaped cross section is provided at the lower end corner of the dash panel 1 having an inclined surface as shown by a chain line in the figure. Panel 1
Thus, measures are taken to form a triangular closed cross section to enhance the rigidity of the dash panel 1. (For example, the actual Kaihei 2-1
03882).

[0006]

The above-mentioned reinforcement 9 provided at the lower end of the dash panel 1 has both ends connected to the left and right side members and has a weight of 3%.
It becomes a member of about kg. Therefore, an object of the present invention is to provide a structure that is lighter and prevents body resonance of a cowl-dash panel system.

[0007]

According to the present invention, as shown in FIG. 4, while the windshield 4, the upward-opening cowl 5, the dash panel 1, and the front floor 2 resonate, the reinforcement 6 of the cowl 5 almost resonates. The conventional reinforcement 9 below the dash panel 1 was abolished, and as shown in FIGS. 1 to 3, the reinforcement 6 of the cowl 5 was removed.
The (first reinforcement) and the upper part of the dash panel 1 are connected to each other by a second reinforcement 7 at a part in the vehicle width direction. Second Reinforcement
7 welds its front end to the upper part of the dash panel 1 and
With the lower end of the first reinforcement 6
Weld to cowl 5.

[0008]

[Operation] The dash panel 1 is connected to the second reinforcement
The resonance of the dash panel 1 is prevented by connecting the first reinforcement 6 having no resonance to the first reinforcement 6 having no resonance , in particular, to the joint portion with the cowl 5 .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1 to 3, 1 is a dash panel, and a lower end portion 102 is an inclined surface.
The rear end is welded to the front edge of the front floor 2. Both side edges of the vertical portion 101 of the dash panel 1 are connected to left and right front pillars 10 (FIG. 1 shows only one of them), and both side edges of the lower end portion 102 are left and right rocker inner panels 11 (FIG. It is allowed welded to only one showing a).

Along the lower edge of the front window 3, an upwardly open cowl 5 having a substantially U-shaped cross section is provided between the left and right front pillars 10. And dash panel 1
The upper end of the vertical portion 101 is welded to the lower front portion of the cowl 5. On the rear surface of the cowl 5, a first reinforcement 6 having a hat-shaped cross section having both ends connected to left and right front pillars 10 is welded , and the cowl 5 and the first reinforcement 6 form a closed cross section. ing.

The first reinforcement 6 and the dash panel 1 are connected by a second reinforcement 7. That is, as shown in FIG. 3, the second reinforcement 7 is bent in the shape of a hat with a hat-shaped cross section, and the front end thereof is welded to the lower end of the first reinforcement 6 integrally with the cowl 5 at the center position in the vehicle width direction. The front end provided with the lid 70a is welded to the dash panel 1 at a position immediately below the joint with the cowl 5. In the drawing, reference numeral 4 denotes a windshield, and 12 denotes a front side member.

In the front structure of the vehicle body constructed as described above, when vibration is input to the dash panel 1 from an unillustrated engine support member or a suspension member, the dash panel 1,
The front floor 2, the cowl 5, and the windshield 4 tend to resonate, but the dash panel 1 is provided on a high-rigidity first reinforcement 6 provided on the rear surface of the cowl 5 with a second high-rigidity reinforcement 7, which is also high rigidity. , The resonance point is raised, and resonance due to engine vibration is prevented. Second Reinforcement 7
Is a cowl-dash panel system in which the first reinforcement is located at a position to reinforce the bottom of the cowl 5 where vibration is particularly large.
Since the cowl 5 is integrally connected to the cowl 6, the vibration damping effect is effectively exhibited. In addition, the windshield 4 and the front floor 2 also have cowls 5 connected thereto.
The resonance is prevented by enhancing the rigidity of the dash panel 1.

The position of the second reinforcement 7 is most preferably at the center position in the vehicle width direction in terms of vibration isolation. However, when other members need to be installed at the center position, the second reinforcement 7 may be shifted in the end direction. The second reinforcement 7 may be provided on both the left and right sides.

[0014]

According to the structure of the present invention, the dash panel 5 is provided between the left and right front side members 11.
Instead of the conventional reinforcement 9 (FIG. 4) joined to the lower end of the vehicle, the cowl 5,
First Reinforcement 6 and Dash Panel 1
By providing the second reinforcement 7, which is much lighter (about 200 g) than the conventional reinforcement 8 , combining the three members, the same effect of preventing the body resonance of the cowl-dash panel system as the conventional one can be obtained. Can be. In addition, by eliminating the conventional reinforcement 9, wiring such as shift cables and fuel tubes,
This is advantageous in terms of installation space for piping.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vehicle body front structure according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a second reinforcement.

FIG. 4 is a resonance model diagram of a conventional vehicle body front part.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 dash panel 2 front floor 3 front window 4 windshield 5 cowl 6 first reinforcement 7 second reinforcement 9 conventional reinforcement 10 front pillar 11 side member

Continuation of front page (72) Inventor Hideo Mori 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-3-248978 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A first reinforcement is welded to an entire length in a vehicle width direction of a rear surface of an upper opening cowl provided along a lower edge of a front window, and a first reinforcement is provided.
A dash panel which the upper end was welded to the front of the cowling
And providing the second reinforcement connecting part in the vehicle width direction of this like, the second reinforcement is its
To the top of the dash panel, and
The cowl is integrated with the lower end of the reinforcement
The front structure of the vehicle body, which is welded .