JPH0719068U - Car body front structure - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a vehicle body front-rear structure that simplifies the structure of the front part of the vehicle body, facilitates the assembly work of the cross member, and enhances the shock absorption effect. [Structure] A front side member 7 having a hat-shaped cross section is extended forward of a radiator support 3, and an extension member 8 is joined so as to cover an outer side surface and a front surface of the extended portion. The cross member 4 and the extension member are fastened with the first fastener, and the flange joint between the extension member and the front side member and the cross member are fastened with the second fastener.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a front body structure of an automobile, and more particularly to a front body structure 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]

[Prior art]

 Conventionally, in order to improve the impact absorption against a frontal collision, the front side member is extended forward by the radiator support, and the extension member (gusset member) is joined to the outer surface of this extension part to form a closed cross-section structure. At the same time, a vehicle body front structure in which a cross member is connected between the left and right front side members is disclosed in, for example, Japanese Utility Model Publication 3-27903. In this case, the extension part of the front side member and the extension member form an impact absorbing part, and by deforming this impact absorbing part against a frontal collision, the impact force applied to the occupant is reduced. Has eased. Further, since the cross member is arranged in the vehicle width direction, rigidity in the vehicle width direction can be secured. However, when mounting the above-mentioned cross member, a mounting member is fixed to the inner surface of the front side member, a short cylindrical flange is provided on this mounting member, and both ends of the cross member are joined to this flange. This method has the disadvantages that the structure is complicated and the work of mounting the cross member is troublesome because a member dedicated to mounting the cross member is required.

[0003]

[Problems to be solved by the device]

 Therefore, a method is conceivable in which the extension member is expanded to cover the front surface of the extension portion of the front side member and the tip of the cross member is bolted to this extension member. In this case, the structure is simpler than the conventional structure, the number of parts can be reduced, and the work of attaching the cross member can be facilitated. However, in this structure, most of the load at the time of collision is transmitted unevenly from the cross member to the extension member, so there is a problem that a sufficient shock absorbing effect cannot be exhibited. Therefore, 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 assembly work of the cross member, and enhances the impact absorption effect.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a front side member having a hat-shaped cross section in front of a radiator support and connecting a cross member between the extension parts. The extension member is joined so as to cover the outer side surface and the front surface, the cross member and the extension member are fastened with the first fastener, and the flange joint portion and cross member of the extension member and the front side member are joined. And are fastened with the second fastener.

[0005]

[Action]

 In the event of a vehicle collision, the load is transmitted from the cross member to the extension member, and is also transmitted from the cross member to the front side member almost evenly. Therefore, the extension portion 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. As the fastener, other fasteners such as rivets may be used in addition to the bolt.

[0006]

【Example】

 1 to 4 show an example of a vehicle body front structure according to the present invention. Fender aprons 2 that form a wheel house are provided on both sides of the front of the vehicle body 1, and a radiator support 3 is fixed to the front end of the fender apron 2. A cross member 4 and a radiator upper support 5 are installed between the left and right radiator supports 3 in the vehicle width direction, and a hood lock support 6 is vertically arranged between the cross member 4 and the radiator upper support 5. It is installed.

A front side member 7 having a hat-shaped cross section that extends in the front-rear direction of the vehicle body is fixed to the lower inner side surface of the fender apron 2, and the fender apron 2 and the front side member 7 form a closed cross-section structure. The front end of the front side member 7 is extended forward of the radiator support 3 and an extension member 8 is joined to cover the outer surface and the front surface of the extension 7a, and the extension 7a also has a closed cross-section structure. . As shown in FIG. 4, a flange portion 7b bent substantially at a right angle is formed at the front end of the front side member 7, and the flange portion 7b and the peripheral portion of the extension member 8 are spot-welded as indicated by a cross mark. ing. The rear end of the extension member 8 is spot-welded to the front side member 7 with the radiator support 3 sandwiched 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 together by a first bolt 9. Further, 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 fastened with the second bolt 10. In this way, both ends of the cross member 4 are fixed at two points respectively. 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 a projection nut fixed to the back surface of the flange portion 7b of the front side member 7. 12 is screwed together.

Since the vehicle body front structure of the present invention is configured as described above, the impact force applied to the cross member 4 at the time of a vehicle collision is generated by the extension member 8 and the front side member as shown by the arrow in FIG. It is evenly distributed to the members 7. Then, the crushable zone C (see FIG. 2) formed by the extension portion 7a of the front side member 7 and the extension member 8 is crushed and absorbs the impact energy, so that the impact force applied to the occupant can be relaxed. Further, since the second bolt 10 is fixed to the joint between the extension member 8 and the flange portion 7b of the front side member 7, the spot hitting point of this portion can be reduced.

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

[0011]

[Effect of device]

 As apparent from the above description, according to the present invention, the extension member is joined so as to cover the outer surface and the front surface of the extension portion of the front side member, and the extension member and the cross member are joined together by the first fastener. Fastening, and the flange joint between the extension member and the front side member and the cross member were fastened with the second fastener, so the structure of the front end of the front side member is simplified and the cross member is easily assembled. be able to. In addition, the load at the time of a vehicle collision is evenly distributed from the cross member to the extension member and the front side member, so the extension of the front side member with a closed cross-section structure is crushed as a crushable zone and impact force is reduced. Can be effectively absorbed.

[Brief description of 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.

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

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

[Explanation of symbols]

 3 Radiator support 4 Cross member 7 Front side member 7a Extension 8 Extension member 9,10 Bolt

Claims (1)

[Scope of utility model registration request] 1. An automobile comprising a front side member having a hat-shaped cross section which extends forward from a radiator support and a cross member connected between the extended parts, and which covers an outer surface and a front surface of the extended part of the front side member. The extension member is joined together, the cross member and the extension member are fastened together with the first fastener, and the flange joint portion between the extension member and the front side member and the cross member are joined together with the second member.
A vehicle body front structure characterized by being fastened with the fasteners of.