JPH0546669U - Front structure of car body - Google Patents

Abstract

(57) [Abstract] [Purpose] To effectively prevent body resonance of a cowl-dash panel 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] The reinforcement 6 provided on the rear surface of the upper-open cowl 5 along the entire length in the vehicle width direction and the lower portion of the joint between the upper dash panel 1 and the front dash panel of the cowl 5 are joined together in the vehicle width direction. Some of them are connected by another reinforcement 7. Instead of the other reinforcement 7 described above, a bulkhead may be provided in the cowl 5.

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. 6, the front part of the vehicle compartment R is separated from the engine room by the dash panel 1. Further, at the lower end of the front window 3 provided with the windshield 4, a cowl 5 having both ends connected to the left and right front pillars is provided along this. The upper end of the dash panel 1 is connected to the front of the cowl 5, and the lower end bent rearward is connected to the front floor 2. Further, in the cowl 5, particularly in the upper opening cowl as shown in the figure, a reinforcement 6 having both ends connected to the left and right front pillars is joined to the 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 vibrations, and vibrations from the engine support portion of the vehicle and around the feet are transmitted to the dash panel 1, the cowl 5, and the front floor connected to them. 2. The windshield 4 resonates, causing 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 in the cowl dash panel system, the dash panel is provided with a reinforcement 9 having an L-shaped cross section as shown by the chain line in the lower corner of the dash panel 1 having an inclined surface. 1 and 3 form a closed triangular cross section, and measures are taken to strengthen the rigidity of the dash panel 1. (For example, Jitsukaihei 2-10 No. 3882).

[0005]

[Problems to be solved by the device]

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

[0006]

[Means for Solving the Problems]

 In the present invention, while the cowl-dash panel system resonates, the reinforcement 6 joined to the rear surface of the cowl 5 hardly resonates, and the front and bottom portions of the cowl 5 to which the upper end of the dash panel 1 is joined. This was done paying attention to the fact that the resonance part has the largest resonance.

Therefore, in the present invention, the conventional reinforcement 9 provided in the lower portion of the dash panel 1 is abolished, and the reinforcement 6 and the lower front portion of the cowl 5 are arranged in the vehicle width direction as shown in FIGS. 1 to 3. The above-mentioned problem is solved by combining some of them with another reinforcement 7.

Further, the present invention solves the above problems by providing a bulkhead 8 in a part of the cowl 5 in the vehicle width direction, as shown in FIGS. 4 and 5, instead of the other reinforcement 7 described above. To achieve.

[0009]

[Action]

 By strengthening the rigidity of the cowl 5, especially the joint with the dash panel 1, the body vibration of the cowl-dash panel system is suppressed and the resonance point is raised, and the occurrence of resonance due to engine vibration is prevented. It

[0010]

Embodiment 1 In the embodiment shown in FIGS. 1 to 3, 1 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 joined to the left and right front pillars 10 (only one of which is shown in FIG. 1), and both side edges of the lower end portion 102 are joined to the left and right rocker panel 11.

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. The rear surface of the cowl 5 is joined to a reinforcement section 6 having a hat-shaped cross section, the both ends of which are connected to the left and right front pillars 10, and the cowl 5 and the reinforcement 6 form a closed section.

The bottom of the cowl 5 is reinforced by another reinforcement 7 at the center position in the vehicle width direction. That is, the other reinforcement 7 is in the shape of a rectangular box that opens upward, and flanges 70a and 70b projecting upward are formed at the front and rear ends. The other reinforcement 7 is arranged along the bottom surface of the bottom of the cowl 5 at the center position in the vehicle width direction, and the rear end flange 70b is welded to the lower end of the reinforcement 6 integrally with the cowl 5, and the front end flange 70b. 70a is welded to the front surface of the cowl 5 at a position directly below the joint with the dash panel 1.

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

Further, in the present invention, the other reinforcement body 7 which is much lighter in weight (about 200 g) than the conventional reinforcement body 9 (FIG. 6) provided in the lower portion of the dash panel 1 has the same body structure as the conventional body. The effect of preventing resonance can be achieved, and the elimination of the conventional reinforcement 9 described above is advantageous in terms of installation space for wiring such as shift cables and fuel tubes, and piping.

The position of the reinforcement 7 is most preferably at the center position in the vehicle width direction for vibration prevention, but it may be shifted toward the end when it is necessary to provide another member at the center position. The reinforcement 7 may be provided in the.

[0016]

Embodiment 2 The embodiment shown in FIGS. 4 and 5 is an embodiment in that the upper opening cowl 5 is provided with a pair of bulkheads 8A and 8B in place of the other reinforcement 7 of the embodiment 1. Different from 1. That is, in the cowl 5, a pair of bulkheads 8A and 8B having a peripheral flange 80a formed are welded at the center position in the vehicle width direction by the flange 80a. The other structure is the same as that of the first embodiment.

The present embodiment has substantially the same effects as the first embodiment.

[0018]

[Effect of the device]

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

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view taken along the line II-II in FIG.

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

FIG. 4 is a vertical cross-sectional view of a second embodiment of the vehicle body front structure of the present invention.

FIG. 5 is a perspective view of a bulkhead used in a second embodiment.

FIG. 6 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 Window 4 Windshield 5 Cowl 6 Reinforcement 7 Other Reinforcement 8A, 8B Bulkhead 9 Conventional Reinforcement 10 Front Pillar 12 Side Member

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

Claims (2)

[Scope of utility model registration request] 1. An upper opening cowl provided along a lower edge of a front window is joined to an upper end of a dash panel that separates an engine room from a vehicle compartment, and a rear surface of the cowl is reinforced in a vehicle width direction. The reinforcement and the front lower portion of the cowl,
A front structure of a vehicle body, characterized in that the reinforcements are connected by another reinforcement arranged along a lower surface of a bottom portion of the cowl in a part in a vehicle width direction. 2. An upper opening cowl provided along the lower edge of the front window is joined to an upper end of a dash panel that separates an engine room from a vehicle compartment, and a rear surface of the cowl is reinforced in a vehicle width direction. The front structure of the vehicle body, characterized in that a bulkhead is provided in the cowl in a part in the vehicle width direction.