JP2581156Y2 - Car body front structure - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a vehicle body front structure,
In particular, the present invention relates to a structure of a vehicle body front portion in which a front side member having a hat-shaped cross section is extended forward of a radiator support, and a cross member is connected between the extended portions.

[0002]

2. Description of the Related Art Conventionally, a front side member is extended forward from a radiator support in order to enhance the shock absorbing property against a forward collision, and an extension member (gusset member) is joined to an outer surface of the extension to close the cross section. In addition to the above structure, the front structure of the vehicle body in which a cross member is connected between the left and right front side members is, for example,
It is disclosed in JP-A-7903. In this case, the shock absorbing portion is constituted by the extension portion of the front side member and the extension member, and the shock absorbing portion is deformed in response to a forward collision to reduce the impact force applied to the occupant. ing. Further, since the cross members are arranged in the vehicle width direction, rigidity in the vehicle width direction can be secured. However, when the cross member is mounted, a mounting member is fixed to the inner surface of the front side member, a short cylindrical flange is provided on the mounting member, and both ends of the cross member are joined to the flange. In this method, a member dedicated to attaching the cross member is required, so that the structure is complicated and the attaching work of the cross member is troublesome.

[0003]

In view of the above, there is a method of expanding the extension member so as to cover the front surface of the extension of the front side member, and bolting the tip of the cross member to the extension member. In this case, there are advantages that the structure is simplified as compared with the conventional structure, the number of parts can be reduced, and the work of attaching the cross member becomes easy. However, this structure has a problem that a sufficient impact absorbing effect cannot be exerted because most of the load at the time of collision is transmitted from the cross member to the extension member. SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle body front-rear structure that simplifies the structure of the front part of the vehicle body, facilitates the work of assembling the cross member, and enhances the shock absorbing effect.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an automobile having a hat-shaped cross-section front side member extending forward from a radiator support, and a cross member connected between the extensions. Connecting an extension member so as to cover an outer surface and a front surface of an extension of the front side member, fastening the cross member and the extension member with a first fastener, and connecting the extension member and the front side member with each other. The flange joint and the cross member are fastened with a second fastener.

[0005]

When the vehicle collides, the load is transmitted from the cross member to the extension member, and is transmitted almost equally from the cross member to the front side member. Therefore, the extension of the front side member having the closed cross-section structure is crushed, and the impact force can be effectively absorbed to reduce the impact force on the occupant. Note that other fasteners such as rivets may be used as the fasteners in addition to the bolts.

[0006]

1 to 4 show an example of a vehicle body front structure according to the present invention. A fender apron 2 constituting a wheel house is provided on both sides of a front portion of the vehicle body 1, and a radiator support 3 is fixed to a front end of the fender apron 2. A cross member 4 and a radiator upper support 5 are provided between the left and right radiator supports 3 in the vehicle width direction, and a hood lock support 6 is provided between the cross member 4 and the radiator upper support 5 in the vertical direction. I have.

A front side member 7 having a hat-shaped cross section extending in the front-rear direction of the vehicle body is fixed to a lower portion of the inner side surface of the fender apron 2, and the fender apron 2 and the front side member 7 form a closed cross-sectional structure. The front end of the front side member 7 extends forward from the radiator support 3, and an extension member 8 is joined so as to cover the outer surface and the front surface of the extension 7a, and the extension 7a also has a closed cross-sectional structure. At the front end of the front side member 7, a flange portion 7b bent substantially at right angles is formed as shown in FIG. 4, and the flange portion 7b and the peripheral portion of the extension member 8 are spot-welded as shown by X marks. I have. The extension member 8
The rear end is spot-welded to the front side member 7 with the radiator support 3 interposed therebetween.

The tip of the cross member 4 is formed flat, and the flat portion and the front surface of the extension member 8 are fastened with a first bolt 9. The joint between the extension member 8 and the flange portion 7b of the front side member 7 and the flat portion of the cross member 4 are the second member.
Bolt 10. As described above, both ends of the cross member 4 are fixed at two places. In addition,
The first bolt 9 is screwed into a projection nut 11 fixed to the back surface of the extension member 8, and the second bolt 10 is connected to a flange 7b of the front side member 7.
Is screwed onto a projection nut 12 fixed to the back surface of the projection.

Since the vehicle body front structure according to the present invention is constructed as described above, the impact force applied to the cross member 4 at the time of a vehicle collision is reduced by the extension member 8 and the front side member as shown by arrows in FIG. 7 are distributed almost evenly. The crushable zone C (see FIG. 2) formed by the extension 7a of the front side member 7 and the extension member 8 is crushed and absorbs impact energy, so that the impact force applied to the occupant can be reduced. Further, the second bolt 10 is connected to the extension member 8.
And the flange portion 7b of the front side member 7 is fixed to the joint portion, so that the spot hitting point at this portion can be reduced.

In the above embodiment, a round pipe is used as the cross member 4. However, the present invention is not limited to this, and a member having any cross-sectional shape such as a square pipe or a hat-shaped cross-sectional member may be used. In any case, it is desirable that the rigidity is high in order to efficiently transmit the impact force to the front side member 7.

[0011]

As is apparent from the above description, according to the present invention, the extension member is joined so as to cover the outer side surface and the front surface of the extension of the front side member, and the extension member and the cross member are connected to the first member. And the flange member of the extension member and the front side member and the cross member are fastened by the second fastener, so that the structure of the front end of the front side member is simplified, Can be easily assembled. In addition, since the load at the time of the collision of the vehicle is almost evenly distributed from the cross member to the extension member and the front side member, the extension of the front side member having the closed cross-sectional structure is crushed as a crushable zone, and the impact force is reduced. Can be absorbed effectively.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a perspective view of a front end of a front side member.

[Explanation of symbols]

 Reference Signs List 3 radiator support 4 cross member 7 front side member 7a extension 8 extension member 9,10 bolt

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B62D 25/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A motor vehicle in which a front side member having a hat-shaped cross section is extended forward from a radiator support, and a cross member is connected between the extended portions, wherein an outer surface and a front surface of the extended portion of the front side member are covered. As described above, the cross member and the extension member are fastened to each other with a first fastener, and the flange joint between the extension member and the front side member and the cross member are connected to the second member.
A vehicle body front structure, wherein the vehicle body is fastened with a fastener.