JP3140511B2 - Car rear body structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear body structure of a motor vehicle, and more particularly to a structure for absorbing a shock at the time of a rear collision (i.e., at the time of a vehicle collision in which a front body impact load acts on the rear of the body). It is about structure.

[0002]

2. Description of the Related Art Generally, a rear fender is provided behind a rear pillar on a side of a vehicle body of a passenger car or the like, and a suspension tower is joined to a portion of the rear fender remote from the rear pillar (for example, Japanese Utility Model Laid-Open No. 2-44578). reference).

In such a rear body structure, in order to improve the strength of the vehicle body at the periphery of the trunk room, etc., a device for joining a reinforcement extending in the vehicle front-rear direction to the upper portion of the rear fender has been devised. Conventionally, this reinforcement is generally connected not only to a rear fender but also to a suspension tower, and its front end extends to the rear pillar and is connected to the rear pillar.

[0004]

In such a rear vehicle body structure, when an impact load directed forward of the vehicle body acts on the suspension tower via a reinforcement or the like at the time of a rear collision, the suspension tower moves forward. Try to displace. Since the suspension tower generally has a downward cavity for accommodating the suspension strut, the above-mentioned forward displacement becomes significant at the upper portion of the suspension tower. With this forward displacement, a load is applied to the rear pillar via the front portion of the suspension tower of the reinforcement to deform the rear pillar forward.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rear body structure of an automobile capable of preventing deformation of a rear pillar due to forward displacement of a suspension tower at the time of a rear collision. It is the purpose.

[0006]

SUMMARY OF THE INVENTION The rear body structure of an automobile according to the present invention achieves the above object by providing an impact absorbing portion between a rear pillar and a suspension tower.

That is, a rear pillar which constitutes a rear edge of a door opening formed in a vehicle body side, a rear fender joined to the rear pillar and extended rearward from the rear pillar, and the rear pillar of the rear fender a suspension tower which is joined at a site distant from the bonded suspension tower and to the upper portion of the rear fender, a vehicle body front and rear reinforcement extending in the direction reinforcement, at the rear vehicle body structure comprising comprising a car
Extends in the front-rear direction, with the front end at the side below the door opening
While the rear end is located at the rear end of the vehicle body.
With a rear frame, the suspension tower and the front
The rear frame is joined to each other, and when an impact load directed forward of the vehicle body acts on the suspension tower, deformation of the rear pillar due to the forward displacement of the suspension tower due to the impact load is prevented. A shock absorbing portion is provided between the rear pillar and the suspension tower.

[0008] The shock absorbing portion is constituted by forming a weak portion at a portion between the rear pillar and the suspension tower of a reinforcement having a front end extending to the rear pillar and joined to the rear pillar. Alternatively, the reinforcement is arranged so that the front end of the reinforcement does not reach the rear pillar, and a shock absorbing portion is formed by a gap between the front end of the reinforcement and the rear pillar. Can be.

[0009]

[Function and Effect of the Invention As shown in the above configuration, suspension
Pension tower is rear fender and rain force
Suspension and rear frame.
The rigidity of the tower and rear fender can be improved.
In addition, when a shock load directed toward the front of the vehicle body acts on the suspension tower, a shock absorber that prevents the rear pillar from being deformed due to the forward displacement of the suspension tower due to the shock load is provided with a rear pillar, a suspension tower, and the like. Therefore, it is possible to prevent the impact load from being transmitted to the rear pillars.

Therefore, according to the present invention, the suspension
It is possible to prevent the rear pillar from being deformed due to the forward displacement of the suspension tower during a rear collision while improving the rigidity of the suspension tower and the rear fender .

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a left side portion of a vehicle body showing a first embodiment of a rear body structure of an automobile according to the present invention,
FIG. 2 is a view taken in the direction of the arrow II. FIGS. 3 and 4 are sectional views taken along lines III-III and IV-IV of FIG. 1 and 2 are drawn with the outer panel of the vehicle body removed for convenience of explanation.

As shown in FIG. 1, the rear body structure is
A rear pillar 12 that forms a rear edge of a door opening 10 formed on a side of the vehicle body, and is joined to the rear pillar 12;
A rear fender 14 extending rearward from the rear pillar 12 and a suspension tower 16 joined to a portion of the rear fender 14 remote from the rear pillar 12
And this suspension tower 16 and rear fender 14
Rear fender reinforcement (reinforcement) that is joined to the upper part of the vehicle and extends in the front-rear direction of the vehicle
18 are provided. In the figure, the rear pillar 12 is shown.
Also, only the inner panels 20 and 22 of the inner panel and the outer panel constituting the rear fender 14 are shown.

The inner panel 20 forms the rear pillar 12 and the front part of the rear fender 14, and the inner panel 22
Form the remaining part of the rear fender 14. The rear fender reinforcement 18 extends in the front-rear direction of the vehicle body so as to straddle the joint between the inner panels 20 and 22, and is joined to the inner panels 20 and 22 to form a closed cross section therewith. The front end of the rear fender reinforcement 18 extends to the rear pillar reinforcement 24 and is joined to the rear pillar reinforcement 24, while its rear end extends to near the rear end of the inner panel 22. The rear pillar reinforcement 24 is joined to the inner panel 20 in the rear pillar 12 and forms a closed cross section extending with the inner panel 20 in the vertical direction. Rear pillar 12
A rear frame 26 extending in the vehicle front-rear direction is joined to a lower portion of the rear fender 14. The rear frame 26 has a rear portion formed so as to be stepped up with respect to a front portion thereof, and the front portion is joined to a side sill reinforcement 28.

As shown in FIG. 3, the suspension tower 16 includes an upper panel 30 and a lower panel 32 joined to each other. The upper panel 30 is joined to the inner panel 20 and the rear fender reinforcement 18 via a wheel house panel 34. The lower panel 32 is joined to the rear frame 26. Also, the outer panel 36 of the rear fender 14
Upper edge of inner panel 20 and wheel house panel 3
4 to form a closed section with them.

As shown in FIG. 1, near the front end of the rear fender reinforcement 18 (ie, the rear pillar reinforcement 24 and the suspension tower 16).
, Two L-shaped recessed beads 18a (fragile portions) extending in a direction substantially perpendicular to the longitudinal direction of the vehicle body are formed in the upper corner portion.

As shown in FIG. 5, which is a perspective view of the rear fender reinforcement 18 as a single item, an opening 18b is formed in a side surface near the front end of the rear fender reinforcement 18, and a lower end near the front end. An upwardly convex arc-shaped bead 18c is formed in the flange portion.

Next, the operation of this embodiment will be described.

In FIG. 1, when an impact load is applied to the vehicle body from the rear side toward the front of the vehicle body (in the direction of arrow A in FIG. 1) due to a rear collision, the impact load is applied to the rear frame 26, the rear fender 14 and the rear fender reinforcement 18 Is transmitted to the suspension tower 16. Since the suspension tower 16 has the downward cavity, the upper end of the suspension tower 16 tends to be displaced forward due to the transmitted impact load. This tendency is due to the fact that the rear frame 26 is formed to be stepped rearward, and the rear frame 26 tends to rotate upward (in the direction of arrow B in the drawing) with the stepped portion as a fulcrum due to an impact load. , More pronounced.

Since the suspension tower 16 and the rear pillar reinforcement 24 are strongly connected by the rear fender reinforcement 18,
Generally, the rear pillar reinforcement 24 is displaced or deformed in accordance with the forward displacement of the suspension tower 16, which also deforms the outer shape of the rear pillar 12. In the present embodiment, however, the rear fender reinforcement 18 The fender reinforcement 18 is formed in the vicinity of the front end of the suspension tower 16 so that the rear fender reinforcement 18
The concave bead 18a
Buckling occurs in the vicinity of the front end, thereby absorbing the impact energy at the time of a rear collision and preventing the rear pillar 12 from being deformed. The impact load from the suspension tower 16 includes not only the components in the direction A but also the direction B in the drawing. However, since the concave bead 18a is formed at the upper corner of the rear fender reinforcement 18, the effect can be reduced. The shock energy can be effectively absorbed.

Further, in this embodiment, as shown in FIG. 5, since the circular bead 18c is formed at the lower end flange near the front end of the rear fender reinforcement 18, the concave bead 18a is subjected to stress concentration. It is possible to secure an extension of the lower end portion when crushing occurs, whereby it is possible to effectively absorb the impact with respect to the component of the impact load in the direction of arrow B. Further, in the present embodiment, the rear fender reinforcement 1
Since the opening 18b is formed in the side surface near the front end of the buckle 8, buckling can be more easily generated near the front end.

Next, a description will be given of a second embodiment of the rear body structure of the automobile according to the present invention.

In the first embodiment, the front end of the rear fender reinforcement 18 extends to the rear pillar reinforcement 24 and is premised on a vehicle body structure joined to the rear pillar reinforcement 24. The shock absorbing portion is constituted by a concave bead 18a formed at a portion between the rear pillar reinforcement 24 and the suspension tower 16, whereas in the present embodiment, as shown in FIG. As shown in FIG. 6 (also shown in FIG.
The front end of the rear fender reinforcement 18 'is arranged so as not to reach the rear pillar reinforcement 24, and the gap 26 between the front end of the rear fender reinforcement 18' and the rear pillar reinforcement 24 as shown by the dotted line). Is different in that it is configured. In this case, by providing the gap 26, the rear pillar 12 accompanying the forward displacement of the suspension tower 16 at the time of a rear collision is provided.
Is prevented, but at that time, the impact energy is absorbed by members such as the rear frame 26 that supports the suspension tower 16.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a rear body structure of an automobile according to the present invention.

FIG. 2 is a view taken in the direction of arrow II in FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a perspective view showing the rear fender reinforcement of the first embodiment as a single item.

FIG. 6 is a side view showing a second embodiment of the rear body structure of the automobile according to the present invention.

FIG. 7 is a perspective view showing the rear fender reinforcement of the second embodiment as a single item.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Door opening part 12 Rear pillar 14 Rear fender 16 Suspension tower 18, 18 'Rear fender reinforcement (reinforcement) 18a Recessed bead (fragile part) 20, 22 Inner panel 24 Rear pillar reinforcement 26 Gap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-99471 (JP, A) JP-A-2-258480 (JP, A) JP-A-1-244983 (JP, A) 96975 (JP, U) Fully open 1987-163178 (JP, U) Fully open 1986-16-16996 (JP, U) Fully open 59-187565 (JP, U) Really open 1-125274 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/04 B62D 25/16

Claims (3)

(57) [Claims] 1. A rear pillar constituting a rear edge of a door opening formed in a vehicle body side, a rear fender joined to the rear pillar and extending rearward from the rear pillar, and the rear pillar of the rear fender a suspension tower which is joined at a site distant from the bonded suspension tower and to the upper portion of the rear fender, a vehicle body front and rear reinforcement extending in the direction reinforcement, at the rear vehicle body structure comprising comprising a body It extends in the front-rear direction, and its front end has a size below the door opening.
The rear end is located at the rear end of the vehicle while connected to the dosill
A rear frame, and the suspension tower and the rear frame
When an impact load directed forward of the vehicle body acts on the suspension tower, an impact absorbing portion that prevents the rear pillar from being deformed due to the forward displacement of the suspension tower due to the impact load, A rear body structure of an automobile, provided between the rear pillar and the suspension tower. 2. A front end of the reinforcement extends to the rear pillar and is joined to the rear pillar, and a fragile portion is formed at a portion of the reinforcement between the rear pillar and the suspension tower. 2. The rear body structure of an automobile according to claim 1, wherein said shock absorbing portion is constituted by said fragile portion. 3. The shock absorber according to claim 1, wherein the reinforcement is disposed such that a front end of the reinforcement does not reach the rear pillar, and a gap between the front end of the reinforcement and the rear pillar. The rear body structure of an automobile according to claim 1, wherein