JP2583114Y2 - 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. A cowl 5 is provided along the lower end of the front window 3 on which the windshield 4 is provided. The upper end of the dash panel 1 is connected to the front of the cowl 5, and the lower end bent backward is connected to the front floor 2. Further, in the cowl 5, in particular, the upward-opening cowl as shown in the drawing, a reinforcement 6 having both ends connected to left and right front pillars is joined to a rear surface thereof in order to enhance rigidity.

By the way, the dash panel 1 is located in a place where it is easily affected by engine vibration, and the vibration from the engine support portion of the vehicle and the surroundings of the vehicle is transmitted to the dash panel 1, the cowl 5, and the front floor 2 connected thereto. Then, the windshield 4 resonates, causing a muffled sound in the cabin R. The broken line in the figure indicates the body resonance model.

In order to prevent the body resonance of the cowldash panel system from occurring, 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 dashed line in the figure. Thus, a countermeasure is taken to form a triangular closed cross section to enhance the rigidity of the dash panel 1. (Eg 2-103
882).

[0005]

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, the present invention has been made to provide a lighter weight and a structure for preventing the body resonance of the cowl-dash panel system.

[0006]

SUMMARY OF THE INVENTION According to the present invention, while the cowl-dash panel system resonates, the reinforcement 6 joined to the rear surface of the cowl 5 hardly resonates.
In addition, attention is paid to the fact that the co-vibration is greatest in a portion extending from the front portion to the bottom portion of the cowl 5 to which the upper end of the dash panel 1 is joined.

In the present invention, however, the conventional reinforcement 9 provided below the dash panel 1 is abolished.
A front lower portion of the reinforcement 6 and the cowl 5 as shown in FIGS. 1 to 3, the mosquito part in the vehicle width direction
It is connected by another reinforcement 7 arranged along the lower surface of the bottom of the ur .

[0008] As the above other reinforcement 7
Is an upwardly opening box-shaped
Reinforcement with flanges 70a, 70b
Use and connect front flange 70a to dash panel 1
To the lower front of the cowl 5 and the rear flange 70
b of the reinforcement 6 joining the cowl 5
Connect to the bottom.

[0009]

The rigidity of the joint with the cowl 5, especially the dash panel 1, is enhanced, thereby suppressing the body vibration of the cowl-dash panel system and increasing the resonance point, thereby preventing the occurrence of resonance due to engine vibration. Is done.

[0010]

Embodiment 1 In the embodiment shown in FIGS.
Is a dash panel, a lower end portion 102 is an inclined surface, and a rear end thereof is joined to a 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 (only one of them is shown in FIG. 1), and both side edges of the lower end portion 102 are connected to left and right rocker inner panels 11. . Dash panel
1 and floor 2 are supported by side members 12
I have.

An upper open cowl 5 having a substantially U-shaped cross section is provided between the left and right front pillars 10 along the lower edge of the front window 3. The upper end of the vertical portion 101 of the dash panel 1 is joined to the lower front part of the cowl 5. The rear surface of the cowl 5 is joined with a reinforcement 6 having a hat-shaped cross section having both ends connected to the left and right front pillars 10, and the cowl 5 and the reinforcement 6 form a closed cross section.

The bottom of the cowl 5 is reinforced by another reinforcement 7 at the center in the vehicle width direction. In other words, the other reinforcements 7 are box- shaped with a square opening,
The front and rear ends are formed with flanges 70a and 70b projecting upward. The other reinforcements 7 are arranged along the bottom lower surface of the cowl 5 at the center position in the vehicle width direction,
The rear end flange 70b is welded to the lower end of the reinforcement 6 joined to the cowl 5 , and the front end flange 70a is welded to the front surface of the cowl 5 immediately below the joint with the dash panel 1.

In the front structure of the vehicle body constructed as described above, the joint between the cowl 5 and the dash panel 1, which have large co-vibration due to engine vibration, is reinforced by the reinforcement 7 to increase rigidity. Since body vibration of the panel system is suppressed and the resonance point is raised, generation of resonance due to engine vibration and generation of muffled sound due to the resonance are prevented.

In the present invention, the other reinforcement 7 which is much lighter (about 200 g) than the conventional reinforcement 9 (FIG. 6) provided below the dash panel 1 prevents the same body resonance as the conventional one. In addition to providing the effect, the elimination of the above-described conventional reinforcement 9 is advantageous in terms of wiring for shift cables, fuel tubes, and the like, and installation space for piping.

The position of the reinforcement 7 is most preferably located at the center position in the vehicle width direction in terms of vibration isolation. However, when it is necessary to provide another member at the center position, it may be shifted in the end direction.
In this case, the reinforcements 7 may be provided on both the left and right sides.

[0016]

[0017]

[0018]

According to the structure of the present invention, the body resonance of the cowl-dash panel system can be realized by providing a member which is much lighter than the conventional member for preventing resonance and which does not require a space. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a vehicle body front structure of the present invention .

FIG. 2 is a longitudinal sectional view taken along line II-II of FIG.

3 is a perspective view of another reinforcement used in the above embodiment.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dash panel 2 Front floor 3 Front window 4 Windshield 5 Cowling 6 Reinforcement 7 Other reinforcement 9 Conventional reinforcement 10 Front pillar 12 Side member

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideo Mori 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References Japanese Utility Model Sho 64-19579 (JP, U) Japanese Utility Model Sho 62-108175 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B62D 25/00-25/08 B62D 25/14-25/22

Claims (1)

(57) [Scope of request for utility model registration] 1. An upper end of a dash panel separating an engine room and a vehicle compartment is connected to a front surface of an upper opening cowl provided along a lower edge of a front window, and a rear surface of the cowl is reinforced to a full length in a vehicle width direction. joining the instrument, and the said reinforcement and the cowl, in some vehicle width direction, on which arranged along the bottom lower surface of the cowl
Open box-shaped flanges at the front and rear
And connect the front flange with the above reinforcement.
At the bottom of the front of the cowl, fit the rear flange
At the lower end of the above reinforcement that joins the cowl
Consolidated by other combined reinforcements
The front structure of the vehicle body, characterized by being stiff .