JP7067254B2 - Body front structure - Google Patents

Description

The present invention relates to a vehicle body front structure.

Conventionally, the vehicle body front structure is provided with a bumper member extending along the vehicle width direction in order to avoid local load input at the time of an offset collision in which a collision object collides with one end of the vehicle body front. Is required. On the other hand, some of the vehicle body front structures absorb impact energy by deforming the side frame at the time of a full-wrap collision in which a collision object collides with the central portion of the vehicle body front.
For example, in the vehicle body front structure of Patent Document 1, the bumper member is provided with a reinforcing structure and a deformation suppressing mechanism to suppress deformation at the time of an offset collision or the like, thereby increasing the bending rigidity of the vehicle body front part. ..

Japanese Unexamined Patent Publication No. 2009-35233

However, in the conventional vehicle body front structure described above, since a strong structure having a predetermined cross section is arranged at the front portion of the side frame, the amount of crushing of the side frame at the front portion of the vehicle body is insufficient at the time of a full-wrap collision. Therefore, the impact absorption stroke is reduced, and there is a problem that the impact energy cannot be effectively absorbed.
In addition, since an impact load is applied locally to the bumper member during an offset collision, it is necessary to take a large deformation space for the bumper member in the front-rear direction of the vehicle, and in a vehicle where a sufficient impact absorption stroke cannot be secured, the impact energy absorption performance is sufficient. There was a risk that it could not be demonstrated.
Further, in the conventional vehicle body front structure, since the bumper member is combined with the reinforcing structure and the deformation suppressing mechanism, there is a problem that the shape of the bumper member becomes complicated and the weight increases.

The present invention has been made in view of such an actual situation, and an object thereof is to improve the rigidity of the bumper member by a reinforcing member connected to the bumper member, and at the same time, how to crush the side frame at the time of a full wrap collision with the bumper member. It absorbs the impact at the side frame without affecting the bumper member, suppresses the breakage of the bumper member in the load input area at the time of an offset collision with the bumper member, and transmits the impact load from the bumper member to the side frame in the vehicle width direction. It is to provide a vehicle body front structure that is possible.

In order to solve the problems of the prior art, the present invention has a side frame extending along the vehicle front-rear direction and arranged on both left and right sides in the vehicle width direction, and a side frame extending along the vehicle width direction. In the vehicle body front structure having a bumper member connected to the tip of the vehicle, a reinforcing member connected to the bumper member is provided between the side frames, and the reinforcing member is the side of the vehicle when viewed from the front of the vehicle. The vehicle is located within the vertical range of the vehicle in which the frame is arranged, and the vehicle width direction end portion of the reinforcing member is arranged close to the side surface portion inside the vehicle of the side frame, and the vehicle of the reinforcing member is arranged. The width direction end portion has a predetermined length in the vehicle front-rear direction, and the predetermined length of the vehicle width direction end portion of the reinforcing member is the vehicle inner side surface portion of the side frame and the vehicle of the reinforcing member. It is set larger than the distance from the end in the width direction .

As described above, the vehicle body front structure according to the present invention extends along the vehicle front-rear direction, side frames arranged on the left and right sides in the vehicle width direction, and extends along the vehicle width direction, and the tip of the side frame. It has a bumper member connected to the portion, and a reinforcing member connected to the bumper member is provided between the side frames, and the reinforcing member is used in the vehicle front view in the vehicle vertical direction in which the side frame is arranged. The reinforcing member is located within the range, and the end portion in the vehicle width direction of the reinforcing member is arranged close to the side surface portion inside the vehicle of the side frame.
Therefore, in the vehicle body front structure of the present invention, since the reinforcing member is connected to the bumper member, the rigidity of the bumper member can be improved. Moreover, since the side surface inside the vehicle of the side frame is not connected to the reinforcing member, it does not affect how the side frame is crushed during a full-wrap collision in which a collision object collides with the center of the front surface of the bumper member. , The shock absorption in the side frame can be surely performed.
Further, in the vehicle body front structure of the present invention, at the time of an offset collision in which a collision object collides with one end of the bumper member, a local load is input to only one of the side frames via the bumper member, and the collision object. Even if the load is concentrated on the load input area of the bumper member in contact with the corner, the rigidity of the bumper member is improved by the reinforcing member, so that it is possible to suppress the breakage of the load input area of the bumper member and the impact from the bumper member to the side frame. The load can be transmitted in the vehicle width direction, and the effect of further suppressing breakage can be obtained.

It is a perspective view which looked at the front side of the vehicle to which the front part structure of the vehicle body which concerns on embodiment of this invention is applied from diagonally above. It is a perspective view of the bumper member, the reinforcing member and the side frame to which the vehicle body front structure which concerns on embodiment of this invention are applied seen from the lower side of a vehicle. FIG. 2 is a plan view of the positional relationship between the reinforcing member and the side frame in FIG. 2 as viewed from below the vehicle. FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 2 is a conceptual plan view of the relationship between the gap between the reinforcing member and the side frame and the length of the reinforcing member in FIG. 2 as viewed from above the vehicle. FIG. 2 is a front view of the positional relationship between the shape changing portion of the bumper member, the reinforcing member, and the extending portion of the side frame as viewed from the rear of the vehicle. It is a conceptual diagram explaining the state at the time of the offset collision of the bumper member, the reinforcing member and the side frame to which the vehicle body front structure which concerns on embodiment of this invention is applied.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
1 to 7 show a vehicle body front structure according to an embodiment of the present invention. In the figure, the arrow Fr direction indicates the front of the vehicle, the arrow O direction indicates the outside of the vehicle, and the arrow U direction indicates the upper side of the vehicle. Further, the arrow X direction indicates the vehicle width direction, and the arrow Y direction indicates the vehicle front-rear direction.

As shown in FIGS. 1 to 3, the vehicle body front portion 1 to which the structure according to the embodiment of the present invention is applied extends along the vehicle front-rear direction and is arranged on both left and right side portions in the vehicle width direction. It has a side frame 2 and a bumper member 3 extending along the vehicle width direction and having a rear side of the vehicle connected to a tip portion 2a of the side frame 2. The bumper member 3 is provided at a front position at the most advanced position of the vehicle. It is arranged on the back side (rear side of the vehicle) of the bumper 4. As shown in FIG. 2, the tip portion 2a of the side frame 2 is formed in a substantially U-shape or a hollow shape in front view of the vehicle (front view of the vehicle), and at least the side surface portion 21 and the bottom surface portion inside the vehicle. It has 22 and a side surface portion 23 on the outside of the vehicle. As shown in FIGS. 2 to 4, a dash panel 10 is provided above the vehicle at the tip end portion 2a of the side frame 2.

In the vehicle body front structure of the present embodiment, as shown in FIGS. 2 to 5, reinforcing members 5 connected to the bumper member 3 are provided in the vehicle width direction between the side frames 2 located on the left and right sides in the vehicle width direction. The reinforcing member 5 is provided along the same direction, and has a square shape when viewed from the front of the vehicle and from the top of the vehicle. Further, the reinforcing member 5 of the present embodiment is located within the range R in the vertical direction of the vehicle in which the side frame 2 is arranged in the vehicle front view (vehicle front view or vehicle rear view), and the vehicle of the reinforcing member 5 is located. The vertical size D is formed to be smaller than the size of the tip portion 2a of the side frame 2 in the vertical direction of the vehicle R. Further, the size D in the vertical direction of the vehicle has a size of a predetermined length L or more, which will be described later (D ≧ L). Moreover, the vehicle width direction end portion 5a of the reinforcing member 5 is arranged close to the side surface portion 21 inside the vehicle of the side frame 2, and the vehicle width direction end portion 5a and the side surface portion 21 are described later. A gap S is provided. That is, the end portion 5a in the vehicle width direction of the reinforcing member 5 and the side surface portion 21 inside the vehicle of the side frame 2 are arranged so as not to be in contact with each other.

As shown in FIG. 4, the end portion 5a of the reinforcing member 5 in the vehicle width direction of the present embodiment has a predetermined length L in the vehicle front-rear direction. Moreover, the end portion 5a of the reinforcing member 5 in the vehicle width direction is arranged so as to project from the bumper member 3 to the rear of the vehicle, and is positioned overlapping with the side frame 2 when viewed from the side of the vehicle. Therefore, in the vehicle body front structure of the present embodiment, even when the impact load is concentrated in the vicinity of the tip portion 2a of the side frame 2 via the bumper member 3 at the time of the offset collision of the bumper member 3 in the vehicle body front portion 1, the vehicle front-rear direction. The presence of the vehicle width direction end portion 5a of the reinforcing member 5 having a predetermined length L is configured to suppress the breakage of the bumper member 3.

Further, as shown in FIG. 5, the length L of the vehicle width direction end portion 5a of the reinforcing member 5 is between the vehicle inner side surface portion 21 of the side frame 2 and the vehicle width direction end portion 5a of the reinforcing member 5. It is set to be larger than the gap S, which is the distance (L> S). Therefore, in the vehicle body front structure of the present embodiment, the bumper member 3 and the reinforcing member 5 are deformed and reinforced by the impact load locally input via the bumper member 3 at the time of the offset collision of the bumper member 3 in the vehicle body front portion 1. The end portion 5a in the vehicle width direction of the member 5 and the side surface portion 21 inside the vehicle of the side frame 2 come into contact with each other, and an impact load is transmitted from the bumper member 3 and the reinforcing member 5 to the side frame 2, so that the bumper member 3 is broken. It is configured to be suppressed.

Further, as shown in FIG. 6, the tip portion 2a of the side frame 2 of the present embodiment has a flange-shaped extending portion 24 extending inward in the vehicle width direction from the side surface portion 21 inside the vehicle. The tip portion 2a of the side frame 2 is joined to the bumper member 3 by spot welding the extending portion 24 in a state of being superposed on the back surface of the bumper member 3. If the joint with the bumper member 3 is not the entire tip portion 2a of the side frame 2 but the extension portion 24, the vehicle at the vehicle width direction end portion 5a of the reinforcing member 5 and the vehicle of the side frame 2 at the time of an offset collision of the bumper member 3. It is possible to bring the inner side surface portion 21 into contact with the inner side surface portion 21. Such an extension portion 24 does not mean only the flange portion, but also a portion capable of transmitting the load input to the bumper member 3 to the side frame 2.
Moreover, the extending portion 24 of the side frame 2 and the end portion 5a of the reinforcing member 5 in the vehicle width direction are arranged so as to overlap each other in the vehicle width direction when viewed from the front of the vehicle. However, the extending portion 24 of the side frame 2 and the end portion 5a of the reinforcing member 5 in the vehicle width direction are not connected and only overlap each other in the vehicle width direction.
As a result, the extending portion 24 exists in the gap S between the side surface portion 21 inside the vehicle of the side frame 2 and the vehicle width direction end portion 5a of the reinforcing member 5, and the load is applied at the time of the offset collision of the bumper member 3. Even if it is input, the structure is such that the side frame 2 and the bumper member 3 are unlikely to break in the close vicinity to each other. Further, when a load is input to the bumper member 3 from the front of the vehicle, the load concentration on the low-rigidity portion located in the vicinity of the side frame 2 can be avoided.

Further, as shown in FIG. 6, the upper edge portion 3a of the bumper member 3 located between the side frames 2 of the present embodiment has a shape changing portion 31 having different lengths in the vertical direction of the vehicle. The shape changing portion 31 is formed on a downwardly inclined surface that is set so that the length L1 in the vertical direction of the vehicle on the outside of the vehicle is longer than the length L2 in the vertical direction of the vehicle on the inside of the vehicle and is inclined from the outside of the vehicle to the inside of the vehicle. It has a predetermined width in the vehicle width direction. The vehicle width direction end portion 5a of the reinforcing member 5 is arranged so as to straddle the shape changing portion 31 of the bumper member 3. That is, the end portion 5a in the vehicle width direction of the reinforcing member 5 has a different length in the vehicle vertical direction, and is arranged so as to extend in the vehicle width direction across two lines where the load is concentrated on the bumper member 3 and breakage is likely to occur. ing. As a result, the breakage of the bumper member 3 that occurs at the time of an offset collision is suppressed.

Next, in the vehicle body front structure of the present embodiment, as shown in FIG. 7, the movement of the load at the time of offset collision in which the collision object B collides with one side of the bumper member 3 will be described.
When the impact load due to the collision object B is input to one end of the bumper member 3 from the front of the vehicle as shown by the arrow F, the load is locally applied to the side frame 2 on one side (left side in the figure), and the collision object. The load is concentrated on the region C of the bumper member 3 in contact with the corner of B, and the load of T1 is transmitted to the side frame 2 on the other side (right side in the figure). At this time, the contact of the end portion 5a in the vehicle width direction of the reinforcing member 5 with respect to the side surface portion 21 inside the vehicle of the side frame 2 occurs separately in the Z1 portion and the Z2 portion.
The first contact is the Z1 portion where the vehicle width direction end portion 5a of the reinforcing member 5 abuts on the vehicle inner side surface portion 21 of the right side frame 2 that is not directly received by the collision object B when an offset collision occurs. The reinforcing member 5 transmits the load of T2 to the side surface portion 21 inside the vehicle of the right side frame 2.
Then, in the second contact, when the collision object B sneaks deep into the bumper member 3, the bumper member 3 is pushed toward the rear side of the vehicle, and the side surface portion 21 inside the vehicle of the left side frame 2 that directly receives the collision object B. The vehicle width direction end portion 5a of the reinforcing member 5 generated at the Z2 portion where the vehicle width direction end portion 5a of the reinforcing member 5 abuts and receives a load from the collision object B is the vehicle inner side surface of the left side frame 2. The load of T3 will be transmitted to the portion 21.

As described above, the vehicle body front structure according to the embodiment of the present invention extends along the vehicle front-rear direction and extends along the vehicle width direction with the side frames 2 arranged on the left and right sides in the vehicle width direction. It has a bumper member 3 connected to the tip portion 2a of the frame 2. A reinforcing member 5 connected to the bumper member 3 is provided between the side frames 2, and the reinforcing member 5 is located within the range R in the vertical direction of the vehicle in which the side frame 2 is arranged when viewed from the front of the vehicle. are doing. Moreover, the vehicle width direction end portion 5a of the reinforcing member 5 is arranged close to the side surface portion 21 inside the vehicle of the side frame 2.
That is, in the vehicle body front structure of the present invention, since the reinforcing member 5 is connected to a wide range of the bumper member 3, the rigidity of the bumper member 3 can be improved as compared with the bumper member having the conventional structure. Moreover, since the side surface portion 21 inside the vehicle of the side frame 2 and the vehicle width direction end portion 5a of the reinforcing member 5 are not connected, at the time of a full-wrap collision in a form in which the collision object B collides with the front center portion of the bumper member 3. The side frame 2 is not affected by the way the side frame 2 is crushed, and the side frame 2 can reliably absorb the impact.
Further, in the vehicle body front structure of the present invention, a local load is input to only one of the side frames 2 via the bumper member 3 at the time of an offset collision in which the collision object B collides with one side end of the bumper member 3. Even if the load is concentrated on the load input region of the bumper member 3 in contact with the corner of the collision object B, the rigidity of the bumper member 3 is improved by the reinforcing member 5, so that the breakage of the load input region C of the bumper member 3 can be suppressed. The impact load F can be transmitted from the bumper member 3 to the side frame 2 as a load T1 in the vehicle width direction, and the breakage of the bumper member 3 can be further suppressed.
Therefore, according to the vehicle body front structure of the present invention, both full-wrap collision and offset collision of the bumper member 3 in the vehicle body front portion 1 can be dealt with.

Further, in the vehicle body front structure of the present embodiment, the vehicle width direction end portion 5a of the reinforcing member 5 has a predetermined length L in the vehicle front-rear direction and is arranged so as to project from the bumper member 3 to the rear of the vehicle. Since it is positioned overlapping with the side frame 2 in the side view, even if the impact load is concentrated in the vicinity of the tip portion 2a of the side frame 2 via the bumper member 3 at the time of the offset collision of the bumper member 3, the vehicle front-rear direction. By the presence of the vehicle width direction end portion 5a of the reinforcing member 5 having a predetermined length L, it is possible to suppress the breakage of the bumper member 3.

Further, in the vehicle body front structure of the present embodiment, the predetermined length L of the vehicle width direction end portion 5a of the reinforcing member 5 is the vehicle width direction end of the vehicle inner side surface portion 21 of the side frame 2 and the reinforcing member 5. Since the distance (gap S) from the portion 5a is set to be larger than the distance (gap S), the bumper member 3 and the reinforcing member 5 are deformed by the impact load locally input through the bumper member 3 at the time of the offset collision of the bumper member 3. Therefore, the end portion 5a in the vehicle width direction of the reinforcing member 5 and the side surface portion 21 inside the vehicle of the side frame 2 come into contact with each other. Therefore, according to the vehicle body front structure of the present embodiment, the impact load is transmitted from the bumper member 3 and the reinforcing member 5 to the side frame 2, so that deformation and breakage of the bumper member 3 can be effectively suppressed. can.

Further, in the vehicle body front structure of the present embodiment, the tip portion 2a of the side frame 2 has an extension portion 24 extending inward in the vehicle width direction, and the extension portion 24 and the reinforcing member 5 in the vehicle width direction. Since the end portion 5a is arranged so as to overlap each other in the vehicle width direction in the front view of the vehicle, the gap S between the side surface portion 21 inside the vehicle of the side frame 2 and the vehicle width direction end portion 5a of the reinforcing member 5. The extension portion 24 is present in the above position, and the load input at the time of the offset collision of the bumper member 3 can suppress the breakage of the close portion between the side frame 2 and the bumper member 3.

Further, in the vehicle body front structure of the present embodiment, the upper edge portion 3a of the bumper member 3 located between the side frames 2 has a shape changing portion 31 having different lengths in the vertical direction of the vehicle, and the reinforcing member 5 has a shape changing portion 31. Since the end portion 5a in the vehicle width direction is arranged so as to straddle the shape change portion 31, it is possible to suppress the breakage of the bumper member 3 that occurs at the time of an offset collision even if there is a portion where the load is likely to be concentrated due to the shape change.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and modifications can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, all of the reinforcing members 5 are arranged so as to project from the bumper member 3 to the rear of the vehicle, and are located overlapping the side frame 2 in the vehicle side view, but in the vehicle width direction. Most of the reinforcing member 5 except the end portion 5a is embedded in the bumper member 3, and only the end portion 5a in the vehicle width direction protrudes from the bumper member 3 to the rear of the vehicle and is arranged so as to overlap with the side frame 2 in the vehicle side view. It may be configured to be located.
Further, in the above-described embodiment, the shape changing portion 31 is formed on the upper edge portion 3a of the bumper member 3, but the shape changing portion 31 is formed on or above the lower edge portion 3b of the bumper member 3. It may be formed on both the edge portion 3a and the lower edge portion 3b.

1 Front part of vehicle body 2 Side frame 2a Tip part 3 Bumper member 3a Upper edge part 3b Lower edge part 5 Reinforcing member 5a Vehicle width direction end part 21 Side frame inside vehicle side 24 Extension part 31 Bumper member shape change part L Reinforcement Length of member in the front-rear direction of the vehicle R Range in the vertical direction of the vehicle in which the side frame is arranged S Gap

Claims (4)

The front part of the vehicle body having a side frame extending along the vehicle front-rear direction and arranged on both left and right sides in the vehicle width direction and a bumper member extending along the vehicle width direction and connected to the tip end portion of the side frame. In the structure
A reinforcing member connected to the bumper member is provided between the side frames, and the reinforcing member is located within a range in the vertical direction of the vehicle in which the side frame is arranged in the front view of the vehicle, and the above-mentioned The vehicle width direction end portion of the reinforcing member is arranged in close proximity to the vehicle inner side surface portion of the side frame.
The end portion of the reinforcing member in the vehicle width direction has a predetermined length in the vehicle front-rear direction.
The vehicle body front structure is characterized in that the predetermined length is set to be larger than the distance between the vehicle inner side surface portion of the side frame and the vehicle width direction end portion of the reinforcing member . 2 . The front structure of the car body. The tip end portion of the side frame has an extension portion extending inward in the vehicle width direction, and the extension portion and the vehicle width direction end portion of the reinforcing member are arranged so as to overlap each other in the vehicle width direction in the front view of the vehicle. The vehicle body front structure according to claim 1 or 2 , wherein the vehicle body front structure is characterized by the above. At least one of the upper and lower edge portions of the bumper member located between the side frames has a shape changing portion having different lengths in the vehicle vertical direction, and the vehicle width direction end portion of the reinforcing member is the shape changing portion. The vehicle body front structure according to any one of claims 1 to 3 , wherein the vehicle body is arranged so as to straddle the two.

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