JPH0546668U - Front structure of car body - Google Patents

Abstract

(57) [Abstract] [Purpose] To effectively prevent body resonance of a cowl-dash panel system of a vehicle equipped with an upper-opening cowl while suppressing an increase in weight of the body as much as possible. [Structure] A first reinforcement 6 is provided on the rear surface of the top-opening cowl 5 along the entire length in the vehicle width direction, and an upper portion of the dash panel 1 whose upper end is joined to the front surface of the cowl 5. 6 and a part of the dash panel 1 in the vehicle width direction are connected by a second reinforcement 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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]

[Prior Art]

 As shown in FIG. 4, the front part of the vehicle compartment R is separated from the engine room by the dash panel 1. Both side edges of the dash panel 1 are joined to the left and right front pillars, and a lower end edge that bends and extends rearward is joined to a front edge of the front floor 2.

On the other hand, at the lower end of the front window 3 provided with the windshield 4, a cowl 5 having both ends coupled to the left and right front pillars is provided along the lower end, and the upper end of the dash panel 1 is joined to the front surface thereof. ing. Further, in the cowl 5, particularly in the upper-open cowl shown in the figure, a reinforcement 6 having both ends connected to the left and right front pillars is joined to the rear surface in order to enhance rigidity.

By the way, the dash panel 1 is in a place where it is easily affected by engine vibration, and vibration is transmitted from the engine support portion and the suspension member to cause the dash panel 1, the cowl 5, the front floor 2, and the windshield 4 to resonate. However, this causes a muffled sound in the passenger compartment R. The broken line in the figure shows the body resonance model.

Therefore, 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 portion of the dash panel 1 which is an inclined surface as shown by a chain line in the figure. Measures are taken to strengthen the rigidity of the dash panel 1 by forming a triangular closed cross section with the panel 1. (For example, Jitsukaihei 2-103882).

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The reinforcement 9 provided at the lower end of the dash panel 1 is provided by connecting both ends to left and right side members and has a weight of about 3 kg. Therefore, an object of the present invention is to provide a structure that is lighter in weight and prevents body resonance of a cowl-dash panel system.

[0007]

[Means for Solving the Problems]

 The present invention was made by paying attention to the fact that the reinforcement 6 of the cowl 5 hardly resonates while the windshield 4, the upper opening cowl 5, the dash panel 1 and the front floor 2 resonate as shown in FIG. However, the conventional reinforcement 9 at the bottom of the dash panel 1 is abolished, and the reinforcement 6 (first reinforcement) of the cowl 5 and the upper portion of the dash panel 1 are removed as shown in FIGS. 1 to 3. It is characterized in that a part of these parts in the vehicle width direction is connected by a second reinforcement 7.

[0008]

[Action]

 Resonance of the dash panel 1 is prevented by connecting the dash panel 1 to the first reinforcement 6 having no resonance by the second reinforcement 7.

[0009]

【Example】

 In the embodiment shown in FIGS. 1 to 3, 1 is a dash panel, the lower end portion 102 is an inclined surface, and the rear end is joined 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 the left and right front pillars 10 (only one of which is shown in FIG. 1), and the both side edges of the lower end portion 102 are located at the left and right rocker panel 11 (one of which is shown in FIG. 1). (Only shown).

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

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

In the front structure of the vehicle body configured as described above, when vibration is input to the dash panel 1 from an unillustrated engine support member or suspension member, the dash panel 1, the front floor 2, the cowl 5, the windshield 4 tries to resonate, but since the dash panel 1 is connected to the first reinforcement 6 having high rigidity provided on the rear surface of the cowl 5 and the second reinforcement 7 having high rigidity, the resonance point is It is increased, and resonance due to engine vibration is prevented. Further, the second reinforcement 7 is a cowl-dash panel system and is located at a position to strengthen the bottom portion of the cowl 5 where vibration deformation is particularly large, so that the vibration damping effect is effectively exhibited. It should be noted that the windshield 4 and the front floor 2 are also prevented from resonance by strengthening the rigidity of the cowl 5 and the dash panel 1 which are respectively coupled thereto.

The position of the second reinforcement 7 is most preferably at the center position in the vehicle width direction for vibration prevention, but it may be shifted in the end direction when it is necessary to install another member at the center position. In this case The second reinforcement 7 may be provided on both the left and right sides.

[0014]

[Effect of the device]

 However, according to the structure of the present invention, the conventional reinforcement 9 (FIG. 4) provided between the left and right front side members 11 and joined to the lower end portion of the dash panel 5 is replaced with the above first portion in the vehicle width direction. By providing a second reinforcement 7 that connects the reinforcement 6 of 1 and the dash panel 1 and is much lighter (about 200 g) than the conventional reinforcement 8, the cowl-dash panel equivalent to the conventional one. The body resonance prevention effect of the system can be achieved. In addition, the elimination of the conventional reinforcement 9 is advantageous in terms of installation space for wiring and piping such as shift cables and fuel tubes.

[Brief description of 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 the line II-II in FIG.

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

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

[Explanation of symbols]

 1 Dash Panel 2 Front Floor 3 Front Wind 4 Windshield 5 Cowl 6 First Reinforcement 7 Second Reinforcement 9 Conventional Reinforcement 10 Front Pillar 11 Side Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Mori 1st Toyota-cho, Toyota-shi, Aichi Toyota Automobile Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A first reinforcement is joined to the entire length in the vehicle width direction of the rear surface of an upper cowl provided along the lower edge of the front window, and the first reinforcement and
A front structure of a vehicle body, characterized in that the upper part of a dash panel whose upper end is joined to the front surface of the cowl is connected by a second reinforcement at a part in the vehicle width direction.