JPH10138953A - Car body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a car body front structure which can improve stiffness and vibration absorbing performance with a simple structure. SOLUTION: In a car body front structure which is in front of a dash panel and is provided with apron side members 7 extending backward and forward in both sides of a car body front part, a dash upper cross member 5 of nearly U-shaped cross section is mounted to the front wall 2a of the dash panel 2 along the direction of car width and the rear ends 7a of the apron side members 7 are curved downward and the top surfaces of the rear ends 7a of the apron side members 7 are joined to the bottom surface 5b of the dash upper cross member 5.

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.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 9 and FIG.
A dash panel 51 is provided to separate the dash panel from the side. At the lower portion of the dash panel 51, a dash lower cross member 52 extending substantially in the vehicle width direction and having a substantially L-shaped cross section is provided, and upper and lower ends of the dash lower cross member 52 are joined to the dash panel 51. By
A closed section is formed at the lower part of the dash panel 51.

[0003] Also, on the left and right sides of the front of the body of the car,
A lower arm inner member 53 and an apron side member 54 are provided, respectively, and a rear end of the lower arm inner member 53 is joined to a dash panel 51 and a dash lower cross member 52. On the other hand, the rear side of the apron side member 54 is mounted on the upper part of the lower arm inner member 53, and a flange portion 54 a formed at the rear end thereof is joined to the dash panel 51. Therefore, the apron side members 54 are linearly arranged on both left and right sides in the engine room E, and abut against the dash panel 51.

[0004]

However, in the conventional vehicle body front structure described above, the apron side member 54 is linearly joined to the dash panel 51 as shown in FIGS. When an external force is applied to the front part of the vehicle body, the apron side member 54 directly presses the dash panel 51, and the amount of deformation of the dash panel 51 and the like to the vehicle compartment R side increases. Was.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle body front structure capable of improving rigidity and vibration absorbing performance with a simple structure. It is in.

[0006]

In order to solve the problems of the prior art, according to the first aspect of the present invention, an apron extending in the front-rear direction in front of a dash panel and on both left and right sides of a front portion of a vehicle body. In the vehicle body front structure in which the side members are provided, a dash upper cross member having a substantially U-shaped cross section is provided along the vehicle width direction on the front surface of the dash panel, and the rear end of the apron side member is moved downward. The rear end upper surface of the apron side member is joined and attached to the lower surface of the dash upper cross member.

According to a second aspect of the present invention, the lower surface of the dash upper cross member according to the first aspect of the present invention extends obliquely downward, and this extended portion is joined to a lower inclined surface of the dash panel. And installed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

1 to 3 show an embodiment of a vehicle body front structure according to the present invention. In the figure, reference numeral 1 denotes a four-wheeled vehicle to which the vehicle body front structure of the present embodiment is applied, and a dash panel 2 for partitioning a vehicle interior R side and an engine room E side is provided at the vehicle front part of the vehicle 1. Has been established. A cowl upper portion 3 that constitutes a part of the cowl portion is provided above the dash panel 2.

As shown in FIGS. 2 and 3, the lower portion of the dash panel 2 is formed in a substantially L-shaped cross section by a vertical front wall 2a and a horizontal bottom wall 2b. The abutting corner is provided with an inclined surface portion 2c that rises from the rear of the vehicle body to the front. In addition, a dash lower cross member 4 having a substantially L-shaped cross section is provided below the dash panel 2 and extends in the vehicle width direction. The dash lower cross member 4 has its upper end and rear end joined to the inclined surface 2c and the bottom wall 2b of the dash panel 2 by spot welding or the like, respectively, and is closed by the dash panel 2 and the dash lower cross member 4. A cross section is formed.

A dash upper cross member 5 having a substantially U-shaped cross section having an opening disposed rearward and having both upper and lower ends bent outward is formed at the lower portion of the front wall 2a of the dash panel 2 by spot welding. Etc.,
As a result, the dash upper cross member 5 is disposed along the vehicle width direction. The upper surface 5a of the dash upper cross member 5 is connected to the front wall 2 of the dash panel 2.
The lower surface 5b of the dash upper cross member 5 is formed in a slightly upward slope from the front wall 2a of the dash panel 2 toward the front of the vehicle body.

On the other hand, a lower arm inner member 6 and an apron side member 7 are disposed on both left and right sides in the engine room E at the front of the vehicle body. The lower arm inner member 6 is formed in a square shape when viewed from the side, and has flange portions 6a and 6b which are bent laterally at the upper and lower ends and the rear end. Thus, the lower arm inner member 6 is attached by joining the flange portions 6 a and 6 b to the lower surface 5 b of the dash upper cross member 5 and the front wall of the dash lower cross member 4. The apron side member 7 extends in the front-rear direction of the vehicle body, is linearly disposed, and has a substantially U-shaped cross section in which the upper and lower ends are bent outward at right angles. Moreover, the upper part of the rear end 7a of the apron side member 7
The upper surface of the curved rear end portion 7a is joined to and attached to the lower surface 5b of the dash upper cross member 5 by spot welding or the like.

In the vehicle body front structure according to the present embodiment,
Even if the apron side member 7 is linearly arranged in the front-rear direction on both the left and right sides in the engine room E, the upper surface of the rear end portion 7a of the apron side member 7 curved downward is a dash upper cross member. 5 lower surface 5b
The dash panel (cabin) 2 is not pushed toward the cabin R side by the impact energy input to the apron side member 7 from the front of the vehicle body, and the impact energy is transmitted to the structure (lower arm inner) below the vehicle body. The member 6 and the dash lower cross member 4 etc.) are smoothly transmitted, and the amount of deformation of the dash panel 2 is reduced as compared with the conventional vehicle body front structure.

The left and right apron side members 7
Since it is connected via the dash upper cross member 5, even when impact energy is input to only one of the apron side members 7, this impact energy travels through the dash upper cross member 5 to the apron side member on the opposite side. 7, which is more advantageous in the vehicle body structure than the conventional one. Moreover, if the rear end portion 7a of the apron side member 7 is simply curved downward, a triangular portion where mud, water, etc. easily accumulates at the joint between the dash panel 2 and the apron side member 7. In the vehicle body front structure according to the first aspect, the triangular portion is closed by the dash upper cross member 5, so that mud, water, and the like hardly accumulate.

FIGS. 4 to 7 show another embodiment of the vehicle body front structure according to the present invention, in which the same members as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. Unlike the above embodiment, the dash upper cross member 5 of the present embodiment has a lower surface 5b extending obliquely downward, and the extension 8 is joined to the inclined surface 2c of the dash panel 2. Installed. Other configurations are the same as those of the above embodiment.

In the vehicle body front structure according to the embodiment of the present invention, lower surface 5b of dash upper cross member 5 is provided.
Since the extension 8 provided on the dash panel 2 is joined to the inclined surface 2c of the dash panel 2, the same effect as that of the vehicle body front structure of the above-described embodiment can be obtained, and the input to the apron side member 7 from the front of the vehicle body. The impact energy is more effectively transmitted to structures below the vehicle body (the lower arm inner member 6, the dash lower cross member 4, etc.), and the amount of deformation of the dash panel 2 can be further reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible based on the technical idea of the present invention. is there.

For example, in the above-described embodiment, the dash lower cross member 4 is joined to the front wall 2a of the dash panel 2 by using the dash upper cross member 5, which is separate from the dash lower cross member 4. Instead of disposing the cross member 5, the dash lower cross member 4 is extended upward to form a dash upper portion 15 corresponding to the dash upper cross member 5, as shown in FIG. The upper surface of the rear end 7a of the apron side member 7 may be joined to the lower surface 15a. With such a structure, it is possible to increase the rigidity of the connecting portion and reduce the number of parts.

[0019]

As described above, the vehicle body front structure according to the present invention comprises an apron side member extending in the front-rear direction on the left and right sides of the front of the dash panel, in front of the dash panel. A dash upper cross member having a substantially U-shaped cross section is provided on the front surface of the dash panel along the vehicle width direction, and a rear end of the apron side member is formed by curving downward, and a rear end of the apron side member is formed. Since the upper surface is joined to the lower surface of the dash upper cross member, it is possible to effectively absorb the impact energy of the front and offset of the vehicle body by a simple structure partially improved from the conventional vehicle body front structure. As a result, it is possible to improve the rigidity and vibration absorption performance near the joint with the dash panel. In addition, in the vehicle body front structure of the present invention, since the triangular portion generated at the joint between the dash panel and the apron side member is closed by the dash upper cross member, mud, water, etc. accumulate in the triangular portion. It is difficult to prevent the generation of rust.

[Brief description of the drawings]

FIG. 1 is a perspective view conceptually showing a four-wheeled vehicle to which a vehicle body front structure according to an embodiment of the present invention is applied.

FIG. 2 is a perspective view of the lower left portion of the vehicle body front structure according to the embodiment of the present invention, as viewed obliquely from below.

FIG. 3 is a side view showing a lower portion of the vehicle body front structure according to the embodiment of the present invention.

FIG. 4 is a perspective view of a lower left portion of a vehicle body front structure according to another embodiment of the present invention, as viewed obliquely from below.

FIG. 5 is a side view showing a lower portion of a vehicle body front structure according to another embodiment of the present invention.

FIG. 6 is a perspective view showing a lower left portion of a vehicle body front structure according to another embodiment of the present invention.

FIG. 7 is a sectional view taken along line AA in FIG.

FIG. 8 is a side view showing a lower portion of a vehicle body front structure according to a modification of the embodiment of the present invention.

FIG. 9 is a side view showing the vicinity of a joint between a lower portion of a dash panel and a rear end of an apron side member in a conventional vehicle body front structure.

FIG. 10 is a perspective view showing the vicinity of a joint between a lower portion of the dash panel and a rear end of an apron side member in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Four-wheeled vehicle 2 Dash panel 2a Dash panel front wall 2b Dash panel bottom wall 2c Dash panel inclined surface 4 Dash lower cross member 5 Dash upper cross member 5b Dash upper cross member lower surface 7 Apron side member 7a Apron side member Rear end 8 extension

Claims (2)

[Claims] 1. An automobile body front structure in which apron side members extending in the front-rear direction are provided in front of the dash panel and on both left and right sides of a front part of the vehicle body. While the dash upper cross member is provided along the vehicle width direction, the rear end of the apron side member is formed by curving downward, and the rear end upper surface of the apron side member is formed on the lower surface of the dash upper cross member. A vehicle body front structure characterized by being joined and mounted. 2. The vehicle according to claim 1, wherein the lower surface of the dash upper cross member is extended obliquely downward, and the extended portion is joined to and attached to a lower inclined surface of the dash panel. Body front structure.