JP2003154907A - Car body rear structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the workability of assembling a bumper beam to a rear side frame without making a major change to the structure of the basic frame, and to increase the rigidity near the center of the vehicle body. The present invention provides a rear body structure of a vehicle capable of preventing inadvertent deformation of a striker portion in response to an impact load from behind. SOLUTION: A rear side frame extending in the front-rear direction of the vehicle body on both left and right sides of a rear part of the vehicle body, a rear skirt connecting rear ends of the left and right rear side frames, and a bumper beam connecting the left and right rear side frames behind the rear skirt. In the rear structure of the vehicle body provided with the above, the bumper beam is directly fixed to the rear side frame via the rear skirt, and is curved so that the vicinity of the center of the vehicle body projects maximally toward the rear of the vehicle body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body rear structure.

[0002]

As shown in FIGS. 4 and 5, a vehicle body rear portion structure of an automobile has an intermediate portion of a pair of left and right rear side frames 1 and 1 extending in the front-rear direction of the vehicle body below a rear floor panel (not shown). The left and right ends of the cross member center 2 are joined and fixed to the rear side frames 1, 1 and the left and right ends of the rear skirt outer 3A of the rear skirt 3 are joined and fixed to the rear ends of the rear side frames 1, 1 to form a basic skeleton. . And this rear skirt outer 3A
The left and right end portions of the bumper beam 5 are supported by a pair of stays 4 and 4 fixed to the rear end portions of the rear side frames 1 and 1 via. Further, the trunk lid 6 or the striker 7 for locking the rear gate is provided inside the vehicle at the center of the rear skirt outer 3A, which corresponds to the center Y / 0 of the vehicle body.
The rear skirt inner 3B of the rear skirt 3 to which is fixed is joined and fixed. In FIG. 5, reference numeral 8 is a rear bumper, and 9 is an E / A foam (buffer member) in the rear bumper 8.
Are shown respectively.

By the way, in such a conventional vehicle body rear structure, stays 4, 4 are attached to the rear end portions of the rear side frames 1, 1 for supporting the bumper beam 5. Therefore, an appropriate space is formed between the outer 3A of the rear skirt and the bumper beam 5 to allow a crash stroke when an impact load is applied from the rear, but with the use of the stays 4, 4, the rear side frame 1, The work process when assembling the bumper beam 5 to 1 becomes complicated, and problems such as securing the assembling accuracy and the rear bumper support strength occur.

Further, since the striker 7 is arranged on the rear skirt 3 at the rear part of the vehicle body, which corresponds to the center Y / 0 of the vehicle body, if this portion is crushed by an impact load, the trunk lid 6 and the rear gate are opened carelessly. Therefore, it is necessary to disperse the transmission energy applied to the striker 7.

Therefore, the present invention has been made in order to solve the problems of the conventional vehicle body rear structure as described above, without making a major change to the structure of the basic skeleton. While ensuring the accuracy of assembling the bumper beam to the rear side frame, improve the workability of assembling the bumper beam and increase the rigidity near the center of the vehicle body to prevent accidental deformation of the striker part against impact load from the rear. It is an object of the present invention to provide a vehicle body rear structure capable of achieving the following.

[0006]

To achieve the above object, the present invention is directed to a rear side frame extending in the vehicle front-rear direction on both left and right sides of a rear part of a vehicle body, and a rear side frame which connects the rear end portions of the left and right rear side frames. In a vehicle body rear structure including a skirt and a bumper beam connecting the left and right rear side frames behind the rear skirt, the bumper beam is directly fixed to the rear side frame via the rear skirt, It is characterized in that the vicinity of the center of the vehicle body is curved so as to protrude toward the rear of the vehicle body to the maximum extent.

Further, according to the present invention, a rear side frame extending in the vehicle front-rear direction on both left and right sides of a rear portion of a vehicle body, a cross member connecting the left and right rear side frames, and a rear side frame of the left and right rear side frames behind the cross member. A rear skirt that connects the rear ends and includes a striker as a lock mechanism, and a center frame that extends in the vehicle longitudinal direction that connects the cross member and the rear skirt between the left and right rear side frames are provided. In the vehicle body rear structure of the automobile, there is provided a reinforcement skirt outer for connecting the striker and the connecting portion of the center frame and the rear skirt in cooperation with the rear skirt in a closed cross-section structure.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the vehicle body rear structure of the present invention will be described below with reference to FIGS.
1 is a perspective view for explaining a vehicle body rear portion structure of the present invention, FIG. 2 is a plan view of the same example, FIG. 3A is a side view of a vehicle body center Y / 0 of the same example, and FIG. [Fig. 4] is a side view of a side end portion of the same example. The same components as those in the conventional example are designated by the same reference numerals.

As shown in FIGS. 1 to 3, the vehicle body rear structure of the present invention is similar to the conventional example in that the cross member center 2 is provided on the left and right sides of the cross member center 2 in the middle portion of the rear side frames 1 and 1 arranged on the left and right sides of the vehicle body rear part. The ends are joined and fixed, and the rear skirt outer 3A of the rear skirt 3 is joined and fixed to the rear ends of the rear side frames 1, 1 to form a basic skeleton. Then, with respect to this basic skeleton, the left and right end portions are directly fixed to the rear end portions of the rear side frames 1, 1 via the rear skirt outer 3A, and are attached to the rear end portions of the rear side frames 1, 1. In the state,
A bumper beam 12 whose middle portion is curved toward the rear of the vehicle body, a center frame 13 interposed between the cross member center 2 and the rear skirt outer 3A, and a rear end portion of the center frame 13 Tie-down hook 14 attached to the rear skirt outer 3
Rinforce skirt outer 1 fixed to the rear of the car
And 5. In addition, reference numeral 16 in FIG.
The cross member front which joins and fixes between the front ends of the rear side frames 1 and 1 is shown.

First, the bumper beam 12 will be described. The bumper beam 12 is a hat-shaped cross-sectional member that is formed so as to open toward the front of the vehicle body, that is, toward the rear skirt outer 3A, and has right and left end portions that are vertically joined to the rear skirt outer 3A. , 12
b is formed, and bolt holes 12c for mounting and fixing which also serve as positioning are formed at respective predetermined positions. Between these left and right end portions, that is, the intermediate portion 12
The bumper beam 12 is shown at d in the rear side frames 1, 1.
When mounted on the rear end, the vehicle body center Y /
It is curved and formed based on the plane curvature such that the vicinity of 0 projects to the rear of the vehicle body to the maximum extent. Therefore, the bumper beam 12 is reinforced against an impact load from the rear by the curved intermediate portion 12d, and
Impact load is efficiently distributed to the left and right sides. Further, interference with other vehicle body members assembled to the vehicle body, for example, the reinforcement skirt outer 15 is avoided. The shape of the bumper beam 12 is not limited to the hat-shaped cross section as in the present embodiment, but may be a closed cross section structure.

The joint surface 12 of the bumper beam 12
In the state where the a and 12b are joined to the left and right end portions of the rear skirt outer 3A, they are fixed to the rear end portions of the rear side frames 1, 1 by bolts 17 penetrating the bolt holes 12c. Although the welding nut is attached to the vehicle body side in the present embodiment as shown in FIG. 3B, the present invention is not limited to this, and the welding bolt may be attached to the vehicle body side. good. Further, the members of the bumper beam 12, the rear skirt outer 3A, and the rear side frames 1 and 1 may be joined and fixed to each other by welding in a superposed state.

Next, the center frame 13 will be described. The center frame 13 is a hat-shaped cross-section member that opens upward, and has a front joint surface that is joined to the rear surface of the cross member center 2 at one end portion in the longitudinal direction and one end portion. A rear joint surface that is joined to the front surface of the rear skirt outer 3A is formed therewith. Further, a tie down hook 14 is attached to the rear end of the center frame 13.

The center frame 13 is arranged between the left and right rear side frames 1, 1 between the cross member center 2 and the rear skirt outer 3A with the longitudinal direction thereof facing the vehicle front-rear direction. The joint surface is joined and fixed by welding in a state where the rear joint surface is joined to the rear surface of the cross member center 2 near the vehicle body center Y / 0, and the rear joint surface is the front vehicle body center Y / 0 of the rear skirt outer 3A.
They are joined and fixed by welding in a state of being joined in the vicinity. The axial crush resistance of the center frame 13 is set to be lower than that of the rear side frames 1, 1 in order to play an auxiliary role of the rear side frames 1, 1.

Next, the reinforcement skirt outer 15 will be described. Rinforce skirt outer 15
It is a hat-shaped cross-section member that is open toward the front of the vehicle body, that is, toward the rear skirt outer 3A, and its longitudinal direction is the distance from the upper edge to the lower edge near the vehicle body Y / 0 on the rear surface of the rear skirt outer 3A. It is said that.

Then, the reinforce skirt outer 15
Are joined and fixed by welding in a vertical state, that is, in a state where the longitudinal direction thereof is oriented in the vertical direction of the vehicle body, in the state of being joined to the rear surface of the rear skirt outer 3A near the vehicle body center Y / 0. That is, the upper end portion of the reinforcement skirt outer 15 is coupled and fixed to the rear skirt outer 3A at a portion corresponding to the striker 7 attached to the rear skirt inner 3B, and the lower end portion of the reinforcement skirt outer 15 covers the rear skirt outer 3A. It is coupled and fixed to the rear end of the center frame 13 via the.

As described above, according to the vehicle body rear structure of the present invention, the bumper beam 12 is directly assembled and fixed to the rear end portions of the rear side frames 1, 1 by the bolts 17 via the rear skirt outer 3A. This eliminates the need for a stay as in the prior art, so that the accuracy with which the bumper beam 12 is attached to the rear side frames 1, 1 can be easily ensured. Further, by reducing the number of parts, it is possible to improve productivity and reduce costs by shortening the bumper beam assembly work process.

Further, by forming the bumper beam 12 so that its middle portion is curved toward the rear of the vehicle body, the function as the bumper beam is ensured even though the bumper beam 12 is directly fixed to the rear side frames 1, 1. can do. That is, it is possible to secure a crash stroke with respect to the vehicle body, more specifically, the rear skirt, as in the conventional structure for fixing the bumper beam via the stay. Therefore, at the time of a light collision from the rear, the load applied to the bumper beam 12 is transmitted to the left and right rear side frames 1 and 1, and the bumper beam 12 is deformed to absorb the shock. At this time, the space between the bumper beam 12 and the rear skirt outer 3A is absorbed. Since the crash stroke is provided on the rear side, sufficient shock absorption can be performed, and damage to the rear skirt 3 can be suppressed, so that repair cost can be reduced. At the time of a large collision, the bumper beam 12 is deformed to absorb the shock, and the rear side frames 1 and 1 are deformed to absorb the shock. At this time, the bumper beam 12 connects the left and right side frames 1 and 1, so that the rear side Stable rear side frames 1, which prevent Euler buckling of the frames 1, 1.
A shaft crush of 1 can be obtained, and shock can be efficiently absorbed. Further, at the time of an offset collision, the rear side frame 1 on one side alone does not receive an impact and the load can be transmitted to the rear side frame 1 on the opposite side, so that the impact can be efficiently absorbed together with the action at the time of the large collision. .
Further, the bumper beam 12 is curved so that the center thereof protrudes most toward the rear of the vehicle body, and the stroke can be secured most to the striker 7 attached to the vehicle body center Y / 0 of the rear skirt 3, so that the striker 7 Interference can be prevented.

Further, the above-mentioned function and effect are obtained by the bumper beam 12
It can be achieved only by changing the shape of the car body and can be applied with the existing frame structure on the body side, so there is no need to make major changes to the structure of the floor panel or basic skeleton, and the bumper beam 12 can be tuned appropriately. By doing so, it becomes possible to easily deal with each destination.

Further, according to the present invention, the center frame 13 connects the vicinity of the center of the cross member 2 and the vicinity of the center of the rear skirt outer 3A between the left and right rear side frames 1, 1, and the rear skirt outer 3A and the reinforcement. The skirt outer 15 connects the striker 7 and the connecting portion of the center frame 13 and the rear skirt outer 3A with a closed cross-section structure. Therefore, in a collision from the rear of the vehicle body, particularly in an offset collision, the left and right rear side frames 1,
Not only can the shock be absorbed by the center frame 13, but also the center frame 13 can be additionally absorbed, and Euler buckling of the left and right rear side frames 1, 1 can be suppressed, and stable axial crushing can be obtained. Further, at that time, the impact load applied to the striker 7 portion of the rear skirt 3 can be dispersed to the center frame 13 from the closed cross-sectional structure formed by the rear skirt outer 3A and the reinforcement skirt outer 15, so that the striker 7 is deformed. It is possible to prevent the trunk lid 6 and the rear gate from being opened accidentally.

[0020]

As described above, according to the vehicle body rear structure of the present invention, the assembling workability is ensured while ensuring the assembling accuracy of the bumper beam to the rear side frame without making a large change in the structure of the basic skeleton. It is possible to provide a rear body structure of an automobile capable of preventing the accidental deformation of the striker portion against an impact load from the rear by increasing the rigidity in the vicinity of the center of the vehicle body.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a vehicle body rear structure of the present invention.

FIG. 2 is a plan view of the same example.

3A is a side view of a vehicle body center Y / 0 of the same example, and FIG. 3B is a side view of a side end portion of the same example.

FIG. 4 is a plan view for explaining a conventional vehicle body rear structure.

FIG. 5 is a side view of a side end portion of the example.

[Explanation of symbols]

1 Rear side frame 2 Cross member center 3 rear skirt 3A Rear skirt outer 7 striker 12 Bumper beam 13 Center frame 15 Lynn Force Skirt Outerwear Y / 0 body center

Claims (2)

[Claims] 1. A rear side frame extending in the vehicle front-rear direction on both left and right sides of a rear portion of a vehicle body, a rear skirt connecting rear end portions of the left and right rear side frames, and the left and right rear side frames behind the rear skirt. In a vehicle body rear structure including a connected bumper beam, the bumper beam is directly fixed to the rear side frame via the rear skirt, and the vicinity of the center of the vehicle body is projected toward the rear of the vehicle body to the maximum extent. A vehicle body rear structure characterized by being curvedly formed. 2. A rear side frame extending in the vehicle front-rear direction on both left and right sides of a vehicle body rear portion, a cross member connecting the left and right rear side frames, and a rear end portion of the left and right rear side frames behind the cross member. A vehicle body including a rear skirt that is connected and has a striker as a locking mechanism, and a center frame that extends in the vehicle front-rear direction and that connects the cross member and the rear skirt between the left and right rear side frames. In the rear structure, there is provided a reinforcement skirt outer for connecting a connecting portion between the striker and the center frame and the rear skirt with the rear skirt in a closed cross-section structure. .