JP2022043371A - Vehicle front part structure - Google Patents

Abstract

To provide a vehicle front part structure which can compressively deform a crash box in a stable manner to improve load absorption performance while suppressing a moment occurring in a side member during a front collision.SOLUTION: A vehicle front part structure has a crash box 1 which connects a front end part of a side member 3 of a vehicle with a front bumper beam 2, which is disposed offset downward from the side member 3, while extending in a vehicle fore and aft direction. An upper wall 5 of the crash box 1 inclines downward toward the vehicle front. A lower wall 6 of the crash box 1 is located below a lower wall of the side member 3 and extends in a horizontal direction. A step 10, which extends in a vehicle width direction and in which a portion at the vehicle front side is located above a portion at the vehicle rear side, is provided on the lower wall 6 of the crash box 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a front structure of a vehicle and to a shock absorbing structure at the time of a collision.

Conventionally, a configuration has been known in which a front bumper beam is provided at the front end of a side member via a crash box in order to absorb an impact load generated when a vehicle collides. In such a configuration, when an impact is received due to a vehicle collision, the crash box is deformed so as to be compressed to absorb the impact.
By the way, in a vehicle having a high vehicle height such as an SUV vehicle, the front bumper beam may be arranged below the side member. As described above, when the heights of the side member and the front bumper beam are different, a structure is known in which the crash box is tilted in the vertical direction as in Patent Document 1.

Japanese Unexamined Patent Publication No. 2012-30624

In addition to this technology, a method of making the heights of the front bumper beam and the side member different by offsetting the crash box vertically with respect to the side member can be considered. In this case, the side member and the crash box Due to the misalignment, when a collision load is applied to the front bumper beam, a moment is generated that lifts the front end of the side member with respect to the side member, the side member deforms before the crash box, and the side There is a risk that the energy absorption efficiency of the members will deteriorate.

The present invention has been made to solve such a problem, and in a vehicle having a crash box arranged offset in the vertical direction with respect to the side member, the moment generated in the side member at the time of a front collision is suppressed. At the same time, it is intended to provide a front structure of a vehicle that stably compresses and deforms a crash box to improve load absorption performance.

In order to achieve the above object, the present invention has a side member extending in the vehicle front-rear direction on both sides in the vehicle width direction, and a side member extending in the vehicle width direction in front of the vehicle and in the vehicle vertical direction with respect to the side member. A front structure of a vehicle having a front bumper beam arranged offset to one side and a crash box extending in the front-rear direction of the vehicle to connect the side member and the front bumper beam, wherein the crash box is provided. The one-sided wall portion of the crash box is located on the one-sided side of the one-sided wall portion of the side member, and the one-sided wall portion of the crash box is provided with a step extending in the vehicle width direction. It is a feature.

As a result, when the front bumper beam receives a load backward and the crash box deforms to absorb the load, as in the case of a vehicle front collision, the wall on one side of the crash box faces the wall on the other side. It is possible to stably compress and deform the crash box backward by suppressing deformation that causes a large vertical bending.
Preferably, the end of the front bumper beam has an inclined portion inclined to the rear of the vehicle toward the outside in the vehicle width direction, and the crash box is connected to the inclined portion and is inside the vehicle width direction of the crash box. The side wall may be provided with a first bead extending in the vertical direction at a position on the front side of the vehicle from the step.

As a result, when the front bumper beam receives a load rearward, as in the case of a vehicle front collision, the side wall inside the crash box in the vehicle width direction is deformed at the position of the first bead located in front of the step. As a result, even if the lengths of the left and right side walls of the crash box are different, the crash box can be compressed and deformed so as not to be tilted to the left or right.
Preferably, the wall portion on the other side in the vehicle vertical direction of the crash box is provided with a second bead extending in the vehicle width direction, and the second bead is provided at the same position as the first bead in the vehicle front-rear direction. It is good.

Thereby, the deformed position of the crash box can be stabilized by the first bead formed on the side wall and the second bead formed on the wall portion on the other side in the vertical direction of the vehicle.
Preferably, the second bead is formed continuously with the first bead, whereby the first bead is in the same front-rear position with each other when the front bumper beam is loaded rearward. And the second bead can stabilize the deformation position of the crash box. Further, since the first bead and the second bead are formed so as to cross the ridgeline portion between the side wall and the wall portion on the other side in the vertical direction of the vehicle, the ridgeline portion is easily deformed and the crash box is deformed. The position can be more stable in the front-back position of the first bead.

Preferably, the wall portion on one side of the crash box is provided with a third bead extending in front of the vehicle from the rear end of the wall portion on the one side to a position rearward of the vehicle from the step.
This makes the rear part of the crash box provided with the third bead less likely to collapse than the front part without the third bead. Therefore, in the event of a light collision, it is possible to protect the rear of the third bead from the front end.

Preferably, an in-vehicle device having a front end located in front of the front end of the side member is provided behind the front bumper beam, and the front end of the third bead may be located in front of the front end of the in-vehicle device.
As a result, even if the front part of the crash box is crushed in a light collision, the portion where the third bead is provided is not easily crushed, and the in-vehicle device can be protected.

Preferably, the wall portion on the other side of the crash box in the vehicle vertical direction is provided with a fourth bead extending in the vehicle width direction at the same position as the front end of the third bead in the vehicle front-rear direction.
As a result, in the event of a light collision, the upper and lower walls of the crash box can be compressed and deformed in a stable shape up to the front end of the third bead and the front and rear positions of the fourth bead, and behind the fourth bead. It is possible to suppress the deformation of the part of.

Preferably, the fourth bead protrudes in the direction opposite to the second bead extending in the vehicle width direction at a position on the front side of the vehicle from the step provided on the wall portion on the other side of the vehicle in the vertical direction of the crash box. good.
As a result, when the crash box is crushed to the fourth bead at the time of a front collision, the wall portion on the other side in the vertical direction of the vehicle provided with the second bead and the fourth bead is deformed alternately in the vertical direction. Since it is crushed, it is possible to prevent the wall portion from bending significantly in one direction in the vertical direction and to suppress the generation of a moment.

Preferably, the wall portion on the other side of the crash box in the vertical direction of the vehicle is inclined to one side toward the front side of the vehicle, and the wall portion on one side may extend horizontally.
This suppresses deformation that causes the crash box to bend significantly in the vertical direction when the front bumper beam receives a load backward and the crash box deforms to absorb the load, such as when the vehicle hits the front. , The crash box can be stably compressed and deformed backward.

According to the front structure of the vehicle of the present invention, even if the front bumper beam arranged offset to one side in the vehicle vertical direction with respect to the side member receives a load toward the rear, the crash box is stably rearward. Since it can be compressed and deformed, the load absorption performance of the crash box can be improved.

It is a perspective view which shows the front structure of the vehicle of embodiment of this invention. It is a side view which shows the front structure of the vehicle of this embodiment. It is explanatory drawing of the effect by a step in this embodiment, and is the side view of the front structure of a vehicle. It is explanatory drawing of the effect by the 1st bead and the 2nd bead in this embodiment, and is the top view of the front structure of a vehicle. It is explanatory drawing of the effect by the 3rd bead in this embodiment, and is the perspective view of the front structure of a vehicle. It is explanatory drawing of the effect by the 4th bead in this embodiment, and is the bottom view of the front structure of a vehicle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a front structure of a vehicle according to an embodiment of the present invention. FIG. 2 is a side view showing the front structure of the vehicle of the present embodiment. Note that FIGS. 1 and 2 show a crash box 1 and a front bumper beam 2 in the front left portion of the vehicle. Further, FIG. 2 is a view of the vicinity of the crash box 1 from a position slightly below the right side of the crash box 1.

As shown in FIGS. 1 and 2, a crash box 1 is fastened to the front end portions of the side members 3 extending in the vehicle front-rear direction on both sides of the vehicle width direction by bolts or the like. The crash box 1 is a cylindrical member having a space inside, and is provided with a front bumper beam 2 extending in the vehicle width direction so as to connect the tips of the crash boxes 1 on both sides in the vehicle width direction. Both ends of the front bumper beam 2 in the vehicle width direction have inclined portions 2a that are inclined rearward toward the outside of the end portions in the vehicle width direction.

In the drawing, the side member 3 on the left side of the vehicle and the crash box 1 are shown, but the side member on the right side of the vehicle and the crash box 1 (not shown) also have symmetrical shapes (that is, "left" and "right"). Since it has a replaced shape), only the structure on the left side of the vehicle will be described below. )
In the present embodiment, the crash box 1 has an upper wall 5 (the wall on the other side in the vertical direction of the vehicle) that is inclined downward toward the front of the vehicle and a lower wall 6 (the wall on the other side in the vertical direction of the vehicle) that extends substantially horizontally. A portion) and left and right side walls 7 and 8 extending in the vertical direction are provided, and the vertical cross section is rectangular and the side view is trapezoidal.

The rear end of the crash box 1 is connected to the lamp support 9 extending in the vertical direction of the vehicle at the front end of the side member 3, and the rear end of the upper wall 5 faces the upper end of the side member 3 of the lamp support 9. , The lower wall 6 is connected to a position located below the lower wall of the side member 3 of the lamp support 9. The lower end of the lamp support 9 is connected to a subframe (not shown).

Further, the front end of the crash box 1 is connected to the inclined portion 2a at the end of the front bumper beam 2, and the side wall 7 located inside the crash box 1 in the vehicle width direction is the side wall 8 located outside in the vehicle width direction. On the other hand, it extends to the front of the vehicle.
As described above, the crash box 1 connects the front bumper beam 2 and the side member 3 via the lamp support 9 in this embodiment.

As shown in FIG. 5, an in-vehicle device, for example, a radiator 20 is arranged behind the front bumper beam 2 at a distance in the front-rear direction behind the front bumper beam 2 (position facing the rear surface). The front end of the radiator 20 is located in front of the front end of the side member 3.
In this embodiment, a vehicle having a high vehicle height such as an SUV vehicle is assumed, and the side member 3 is arranged at a relatively high position. On the other hand, the vertical position of the front bumper beam 2 is offset below the vertical position of the side member 3 so that the front bumper beam 2 can receive the collision load when colliding with a vehicle having a low vehicle height, for example. That is, the lower end of the front bumper beam 2 is arranged so as to be located below the lower wall of the side member 3. Therefore, the crash box 1 connecting the side member 3 and the front bumper beam 2 is offset downward with respect to the side member 3 (the lower wall 6 is located below the side member 3) as described above. The fact that the crash box 1 is offset with respect to the side member 3 means that the rear end of the crash box 1 is offset with respect to the front end of the side member 3.

The crash box 1 of the present embodiment is provided with a step 10 on the lower wall 6, a first bead 11 on the upper wall 5, a second bead 14 on the right side wall 7 on the inner side in the vehicle width direction, and a third bead 14 on the lower wall 6. The bead 12 and the upper wall 5 are provided with a fourth bead 13.
The step 10 is provided in the middle portion in the front-rear direction of the lower wall 6, and is formed so as to extend the lower wall 6 over the entire width direction of the vehicle. In the present embodiment, the step 10 is located slightly behind the front end of the side wall 8 on the outer side in the vehicle width direction. The lower wall 6 is formed so that the portion on the front side of the vehicle is located, for example, several mm to several cm above the portion on the rear side of the vehicle of the step 10.

The first bead 11 and the second bead 14 are formed in front of the vehicle with respect to the step 10, and the upper wall 5 and the side wall 7 on the inner side in the vehicle width direction are projected outward by, for example, several mm to several cm. It is a convex bead. The first bead 11 extends in the entire vertical direction on the side wall 7 of the crash box 1, and the second bead 14 extends in the entire width direction on the upper wall 5. The first bead 11 is located at a position in front of the front end of the side wall 7 located inside the crash box 1 in the vehicle width direction and outside the side wall 8 located outside the vehicle width direction. The second bead 14 is located at the same position as the first bead 11 in the vehicle front-rear direction of the upper wall 5. Further, the first bead 11 and the second bead 14 are formed so as to be continuous with each other, and the ridge line portion 15 between the upper wall 5 and the side wall 7 also protrudes outward.

The third bead 12 is a convex bead that extends forward from the rear end portion of the crash box 1 on the lower wall 6, that is, the connection position with the side member 3, and protrudes downward by, for example, several mm to several cm. Two third beads 12 are provided on the lower wall 6 at intervals in the vehicle width direction, and extend to a position behind the vehicle from the step 10. Further, the front end of the third bead 12 is located in front of the radiator 20.

The fourth bead 13 is provided on the upper wall 5 and extends over the entire width direction of the vehicle at a position substantially the same as the tip of the third bead 12 in the vehicle front-rear direction. It is a concave bead that dents in. Further, the fourth bead 13 is formed so as to be recessed inward in the ridge line portion 15 between the upper wall 5 and the right side wall 7 and the ridge line portion 16 between the upper wall 5 and the left side wall 8.
Next, the effects of the step 10, the first bead 11, the second bead 14, the third bead 12, and the fourth bead 13 provided in the crash box 1 will be described with reference to FIGS. 3 to 6. In FIGS. 3 to 5, the figure on the left side shows the state where the collision load is not received, and the figure on the right side shows the state where the collision load is received from the front. Further, FIG. 6 also shows a state in which a collision load is received from the front.

When the crash box 1 connecting the side member 3 having different vertical positions and the front bumper beam 2 is offset downward with respect to the side member 3 as in the present embodiment, the front is as in the case of a front collision. When a collision load is applied to the bumper beam 2 toward the rear of the vehicle, the crash box 1 is pressed so as to dive under the side member 3, thereby providing a moment that lifts the front end of the side member 3 upward. There is a risk of giving. In this way, when a moment acts on the side member 3, the load absorption performance of the side member 3 deteriorates.

However, as shown in FIG. 3, in the present embodiment, by providing the step 10 on the lower wall 6 of the crash box 1, when a collision load is applied to the front bumper beam 2 in the rear, the step 10 causes the crash box 1 to have a step 10. Since the lower wall 6 is crushed and the collision load transmitted from the lower part of the crash box 1 to the side member 3 is absorbed, it is possible to suppress the generation of a moment that lifts the front end portion of the side member 3 upward.

It is conceivable to provide a bead extending in the vehicle width direction on the lower wall of the crash box 1 instead of the step 10. By providing the lower wall 6 with a bead extending in the vehicle width direction in this way, the lower wall 6 of the crash box 1 is crushed at the position of this bead at the time of a front collision, and the collision is transmitted from the lower part of the crash box 1 to the side member 3. Although it absorbs the load, the lower wall 6 of the crash box 1 undergoes a convex deformation at the position of the bead, and a moment that lifts the front end portion of the side member 3 upward is generated, so that the bead is not a step.

Further, by forming the step 10 so that the portion on the front side of the vehicle from the step 10 on the lower wall 6 is located above the portion on the rear side of the vehicle, the cross-sectional area on the front side of the vehicle from the step 10 on the crash box 1 is formed. Is smaller than the cross-sectional area on the rear side of the vehicle, so that the crash box 1 can be crushed more reliably from the front, and the deformation of the crash box 1 can be stabilized.
As shown in FIG. 4, the end portion of the front bumper beam 2 has a shape inclined rearward toward the outside in the vehicle width direction, and the side walls 7 and 8 of the crash box 1 have a short outside in the vehicle width direction. The inside in the vehicle width direction is formed long. Therefore, when a collision load acts on the front bumper beam 2 behind the vehicle, the collision load tilted in the vehicle width direction is input to the step 10 of the crash box 1, and the crash box 1 is stably compressed in the front-rear direction. It may be difficult to sufficiently absorb the load without deformation.

In the present embodiment, by providing the first bead 11 at a position in front of the step 10 of the side wall 7 on the inner side in the vehicle width direction of the crash box 1, the side wall 7 is deformed in front of the step 10 at the time of a front collision. It is possible to prevent the collision load input to the step 10 from tilting in the vehicle width direction. Further, since the second bead 14 is provided on the upper wall 5, the upper wall 5 and the side walls 7 and 8 are substantially the same length on the left and right by the first bead 11 and the second bead 14 at the time of front collision. It will be crushed. At this time, by extending the second bead 14 in parallel with the step 10, it is possible to further suppress the collision load input to the step 10 from tilting in the vehicle width direction. In particular, since the first bead 11 and the second bead 14 are connected and the bead is also provided on the ridge line portion 15 between the upper wall 5 and the side wall 7, the ridge line portion 15 is stably deformed. be able to.

As shown in FIG. 5, the lower wall 6 of the crash box 1 is provided with a third bead 12 extending in the front-rear direction of the vehicle, so that when a large collision load is input, the rear portion of the lower wall 6 of the crash box 1 is formed. It is possible to suppress the deformation so as to break, and to suppress the generation of a moment that lifts the front end portion of the side member 3 upward.
As shown in FIG. 5, since the third bead 12 extends to the front of the radiator 20, the portion where the third bead 12 is provided is less likely to collapse backward in the event of a light collision, and the radiator 20 or the like It is possible to avoid damaging the in-vehicle device.

Further, as shown in FIG. 6, a fourth bead 13 extending in the left-right direction is provided on the upper wall 5 of the crash box 1 at substantially the same front-rear position as the front end portion of the third bead 12, so that in the event of a light collision. When the lower wall 6 of the crash box 1 is crushed to the front end of the third bead 12, the upper wall 5 is positively deformed at the position of the fourth bead 13, and the portion behind the fourth bead 13. Can be suppressed from being crushed. As a result, it is possible to further suppress the deformation of the portion behind the fourth bead 13 at the time of a light collision, and to avoid damaging the in-vehicle device such as the radiator 20.

Further, the second bead 14 provided on the upper wall 5 of the crash box 1 is a convex bead, and the fourth bead 13 is a concave bead, which protrudes in opposite directions. As a result, the upper wall 5 of the crash box 1 is alternately deformed and crushed in the vertical direction at the time of a front collision, so that the deformation of the crash box 1 can be made more stable.
The present invention is not limited to the above embodiment. For example, with respect to the above-mentioned step 10, the first bead 11, the second bead 14, the third bead 12, and the fourth bead 13, the beads 11, 12, 13, 14 if at least the step 10 is provided. May be adopted as appropriate. Further, in the above embodiment, the front bumper beam 2 is located below the side member 3, and the crash box 1 is offset downward with respect to the side member 3, but the front bumper beam 2 is above with respect to the side member 3. When the crash box 1 is offset upward with respect to the side member 3 (the upper wall 5 is positioned above the upper end of the side member 3), the crash box is turned upside down with respect to the above embodiment. A step 10 and beads 11, 12, 13, and 14 may be formed on 1.

Although the present invention is a crash box having a trapezoidal shape in a side view, it can also be applied to a rectangular crash box in a side view.

1 Crash box 2 Front bumper beam 2a Inclined part 3 Side member 5 Upper wall 7 Side wall 6 Lower wall
10 Step 10 Step 11 1st bead 12 3rd bead 13 4th bead 14 2nd bead 20 Radiator (vehicle-mounted device)

Claims (9)

A side member extending in the vehicle front-rear direction on both sides in the vehicle width direction, and a front bumper beam extending in the vehicle width direction in front of the vehicle of the side member and being arranged offset to one side in the vehicle vertical direction with respect to the side member. A front structure of a vehicle comprising a crash box extending in the front-rear direction of the vehicle to connect the side member and the front bumper beam.
The one-sided wall portion of the crash box is located on the one-sided side of the one-sided wall portion of the side member.
The front structure of the vehicle, characterized in that the wall portion on one side of the crash box is provided with a step extending in the vehicle width direction. The end portion of the front bumper beam has an inclined portion inclined toward the rear of the vehicle toward the outside in the vehicle width direction.
The crash box is connected to the inclined portion and is connected to the inclined portion.
The front structure of the vehicle according to claim 1, wherein the side wall of the crash box on the inner side in the vehicle width direction is provided with a first bead extending in the vertical direction at a position on the front side of the vehicle from the step. A second bead extending in the vehicle width direction is provided on the wall portion on the other side of the crash box in the vehicle vertical direction.
The front structure of the vehicle according to claim 2, wherein the second bead is provided at the same position in the vehicle front-rear direction as the first bead. The front structure of the vehicle according to claim 3, wherein the second bead is formed continuously with the first bead. Claim 1 is characterized in that the wall portion on one side of the crash box is provided with a third bead extending in front of the vehicle from the rear end of the wall portion on the one side to a position rearward of the vehicle from the step. The front structure of the vehicle according to any one of 4 to 4. Behind the front bumper beam, an in-vehicle device having a front end located in front of the front end of the side member is provided.
The vehicle front structure according to claim 5, wherein the front end of the third bead is located in front of the front end of the vehicle-mounted device. The wall portion of the crash box on the other side in the vehicle vertical direction is provided with a fourth bead extending in the vehicle width direction at the same position as the front end of the third bead in the vehicle front-rear direction. The front structure of the vehicle according to claim 6. The fourth bead protrudes in the direction opposite to the second bead extending in the vehicle width direction at a position on the front side of the vehicle from the step provided on the wall portion on the other side of the vehicle in the vertical direction of the crash box. 7. The front structure of the vehicle according to claim 7. Claim 1 is characterized in that the wall portion on the other side of the crash box in the vertical direction of the vehicle is inclined toward the one side toward the front side of the vehicle, and the wall portion on the one side extends horizontally. The front structure of the vehicle according to any one of 8 to 8.

Images