JPS6239981Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automobile body structure, and more particularly to a rear frame structure of an automobile.

The rear of a car must be made strong enough not only to withstand the forces that actually act on it all the time, but also to be made strong enough to withstand anticipated rear-end collisions (for example, in the case of a rear-end collision). 2. Description of the Related Art Various frame structures for the rear part of an automobile that have high strength against sudden loads have been proposed. For example, Japanese Utility Model Application Publication No. 55-124369 discloses a frame structure in which the front part of the rear frame is formed into a Y shape to increase rigidity.

It is an object of the present invention to provide an automobile body structure that has higher strength against rear collisions than the conventional vehicle body structure as described above, and can thereby safely protect occupants in the passenger compartment.

In the vehicle body structure of the present invention, the front end of the rear frame member is arranged so as to extend in the longitudinal direction of the vehicle inside the vehicle body away from the inner vertical wall of the wheel house, and then joined to the floor panel and closed. The front end of this rear frame member is connected to the side sill in front of the wheel house, and the front end of the rear frame member has a section extending in the longitudinal direction of the vehicle body and connected to the floor panel so as to be closed. A front frame member forming a cross section is provided, the rear part of the front frame member is bent diagonally outward toward the rear, and the curved portion and
A notch is formed in one of the parts of the rear frame member that is inward from the wheel house, and the other part is fitted into this notch and connected to each other. The rear end of the protruding front frame member
It is characterized by being connected to the inner vertical wall of the wheel house.

In the above vehicle body structure, the rear collision load applied to the rear frame member is also distributed to the front frame member cross-coupled with the rear frame member, and is firmly received by both frame members. In addition, since the rear end of the front frame member is connected to the wheel house, the rear collision load can also be received by the wheel house, effectively preventing deformation and destruction of the rear part of the vehicle body.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 is a view of the vehicle body structure (near the wheel house for the right rear wheel) of an automobile according to the first embodiment of the present invention, viewed from the inside front side of the vehicle body. A rear frame member 2 and a front frame member 3, which have a hat-shaped cross-sectional shape and extend substantially in the longitudinal direction of the vehicle body, are disposed on the lower surface of the floor panel 1 shown by imaginary lines in the figure.
The subassembly is performed by welding the flanges 2a and 3a, respectively. This floor panel 1 is joined to the side sill and wheel house 5 by welding the outer flange 1a to form a rear vehicle body structure.

The front end portion 2b of the rear frame member 2 extends further forward than the wheel house 5, and a flange 2c formed on the outer surface thereof is connected to a quarter panel 4 forming the inner wall of the side sill. Note that this connection is performed by welding (usually spot welding), and the connection of other members described below is also performed in the same manner. A rear portion of the rear frame member 2 from the front end portion 2b extends toward the rear end of the vehicle body at a position slightly away from the wheel house 5 inward of the vehicle body.

The front frame member 3 extends further into the vehicle body than the rear frame member 2 at the side portions of the rear frame member front end portion 2b, but gradually bends outward toward the rear. Attach rear frame member 2 to notch 3b
and intersects with the rear frame member 2,
A rear end portion 3c projecting outward from the rear frame member 2 is coupled to a vertical wall of the wheel house 5. The intersection of the front frame member 3 and the rear frame member 2 is connected to each other by welding the flange 3d around the notch 3b of the front frame member 3 to the outer surface of the rear frame member 2.

In the above structure, the rear collision load applied to the rear frame member 2 from the rear of the vehicle toward the front in the event of a rear collision is also distributed to the front frame member 3, which is cross-coupled, and applied to the two frame members 2 and 3. Therefore, it can be firmly accepted. Moreover, the rear end portion 3c of the front frame member is connected to the wheel house 5, and the front end portion 2 of the rear frame member
Since b is coupled to the side sill, the rear collision load is also received by the wheel house 5 and the side sill. Therefore, in the case of a passenger car or the like, the area in front of the intersection, where the rear part of the vehicle compartment is normally located, has extremely high strength against rear collision loads. In addition, since the rear frame member 2 and front frame member 3 are connected almost linearly in the longitudinal direction of the vehicle body, the rear collision load is efficiently distributed to the front part of the front frame member 3, preventing stress concentration. be done. Further, in the above structure, the load applied from the front side of the vehicle body is also received by the wheel house 5 via the front frame member 3, so that the load can be distributed.

Normally, floor panel 1 and wheel house 5 are welded by inserting a welding machine from below the vehicle body, but in the above structure, a gap is formed between rear frame member 2 and wheel house 5. , a welding machine can be inserted through this gap. Also, front frame member 3
The floor panel 1 and wheel house 5 located directly above the rear end portion 3c are also welded using the usual method by providing a small hole for inserting a welding machine on the lower surface of the front frame member 3. It can be done.

Note that the rear end portion 3c of the front frame member is
In addition to being coupled to the inner surface of the wheel house 5 as shown in FIG. 1, it can also be coupled to the rear surface of the wheel house 5. However, in order to increase the strength of the welded surface by applying the load applied to the welded surface between the rear end portion 3c of the front frame member and the wheel house 5 in the welded surface tensile direction as much as possible, rather than in the welded surface peeling direction, in the event of a rear collision, Preferably, they are bonded as shown in FIG.

In the above embodiment, the front frame member 3 is provided with a notch 3b in order to intersect the rear frame member 2 and the front frame member 3, but as shown in FIG. A notch 12b may be provided, and the front frame member 13 may be received in the notch 12b to cross-connect both frame members 12 and 13. However, since the rear collision load is mainly applied to the rear frame member in the compression direction, providing a notch in the rear frame member significantly reduces the strength against the rear collision load. Therefore, from the viewpoint of frame strength, it is preferable to provide a notch in the front frame member as in the embodiment shown in FIG.

As explained in detail above, the vehicle body structure of the present invention has unprecedented strength against rear collision loads, and is effective in safely protecting vehicle occupants in the event of a rear collision.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention, and FIG. 2 is a perspective view showing a second embodiment of the present invention. 2, 12...Rear frame member, 2b...
Front end of rear frame member, 3, 13... Front frame member, 3b... Notch of front frame member, 3c... Rear end of front frame member, 4... Quarter panel, 5...
Wheel house, 12b...Notch in rear frame member.

Claims (1)

[Scope of Claim for Utility Model Registration] A rear frame member is provided that extends in the longitudinal direction of the vehicle body on the inside of the vehicle body spaced apart from the inner vertical wall of the wheel house, and is joined to the floor panel to form a closed cross section; The front end of the rear frame member is connected to the side sill in front of the wheel house, and inside the front end of this rear frame member is a front frame member that extends in the longitudinal direction of the vehicle body and is joined to the floor panel to form a closed section. The rear part of the front frame member is bent diagonally outward toward the rear, and a notch is provided in either the bent part or the part of the rear frame member inward from the wheel house. is formed, the other is fitted into the notch and coupled, and the rear end of the front frame member protruding outward beyond the rear frame member is coupled to the inner vertical wall of the wheel house. The body structure of a car.