JP5772389B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure.

  For example, Patent Document 1 discloses a front side member structure in which a rear portion of a front side member is bent outward in the vehicle width direction during a frontal collision of a vehicle (so-called front collision) to efficiently absorb collision energy. Yes.

JP 2009-196544 A

  As described above, in this prior art, since the rear part of the front side member is bent outward in the vehicle width direction, the members disposed around the front side member interfere with the front side member and move in an unexpected direction. there's a possibility that. Therefore, this prior art has room for improvement from the viewpoint of improving the passenger compartment protection performance at the time of a front collision.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the vehicle front part structure which can improve the compartment protection performance at the time of front collision.

The vehicle front part structure according to claim 1 is a pair of suspension towers arranged on the left and right side parts of the vehicle front part, and a dash panel that is arranged behind the suspension tower and divides the engine room and the vehicle compartment. A pair of front side members disposed below the suspension tower and provided with kick portions that extend in the vehicle front-rear direction and incline toward the vehicle lower side toward the vehicle rear side toward the rear end side; located in front of the vehicle than the vehicle rear and the dash panel and the kick portion of the suspension tower in the side members, than the upper side in the vehicle vertical direction is set so that the intensity of the lower side is lower, the front side member varying strength to the and the suspension tower is bent toward the vehicle upper tilted toward the vehicle front side And parts, the has.

  In the vehicle front portion structure according to the first aspect, suspension towers are respectively disposed on the left and right side portions of the vehicle front portion. A dash panel that partitions the engine room and the passenger compartment is provided behind the suspension tower.

Further, on the lower side of the suspension tower is provided with a pair of front side members, front side members extend in the vehicle longitudinal direction, and the dash panel and the kick portion provided we are on the rear side of the front side member Yes. Here, an intensity changing portion is provided in the front side member behind the suspension tower and in front of the dash panel and the kick portion . The strength changing portion is set so that the strength on the lower side is lower than the upper side (in the vehicle vertical direction) of the front side member.

  Generally, when a frontal collision load is input to the front side member at the time of a frontal collision of the vehicle (so-called frontal collision), the front end side of the front side member is compressed and deformed along the axial direction so as to absorb impact energy. Is set to In the present invention, the strength change portion of the front side member is set so that the strength on the lower side is lower than the upper side of the front side member.

  For this reason, when a frontal collision load is input to the front side member, the lower side of the front side member tends to bend before the upper side in the strength changing portion. Accordingly, in the strength changing portion, on the lower side of the front side member, the vehicle front side and the vehicle rear side of the strength changing portion are close to each other, and the front side member bends upward. The impact energy is absorbed by the deformation of the front side member.

On the other hand, when the front side member is compressed and deformed along the axial direction, the suspension tower positioned above the front side member may interfere with a dash panel provided behind the suspension tower in the vehicle. Since the strength changing portion is located behind the suspension tower and in front of the dash panel and kick portion of the vehicle, if the front side member bends upward in the strength changing portion, the suspension tower tilts toward the front of the vehicle. . As described above, when the suspension tower is tilted toward the front side of the vehicle, the dash panel is disposed on the vehicle rear side of the suspension tower. Therefore, the suspension tower is tilted toward the direction away from the dash panel.

  That is, according to the present invention, it is possible to specify a position in the front side member that is desired to be bent upward when deformed by an impact load input. Then, by utilizing the deformation of the front side member to tilt the suspension tower toward the vehicle front side, interference between the suspension tower and the dash panel can be suppressed.

  The vehicle front part structure according to claim 2 is the vehicle front part structure according to claim 1, wherein the weakness part is provided in the lower part of the front side member in the strength changing part.

  In the vehicle front structure according to the second aspect, the fragile portion is provided at the lower portion of the front side member, for example, by providing a concave bead or a hole. Thereby, the strength of the lower portion can be set lower than the upper portion of the front side member in the strength changing portion.

  The vehicle front part structure according to claim 3 is the vehicle front part structure according to claim 1, wherein a reinforcing portion is provided on an upper portion of the front side member in the strength changing portion.

  In the vehicle front structure according to the third aspect, the reinforcing portion is provided on the upper portion of the front side member, so that the strength of the upper portion of the front side member is higher than the other portions in the strength changing portion. Thereby, in the intensity | strength change part, the lower intensity | strength can be set relatively lower than the upper part of a front side member.

  The vehicle front portion structure according to claim 1 has an excellent effect that the vehicle compartment protection performance at the time of a front collision can be improved.

  The vehicle front portion structure according to claim 2 has an excellent effect that the front side member in the present invention can be easily manufactured because only the lower portion of the front side member is processed.

  The vehicle front structure according to claim 3 is excellent in that it can be set so that the strength of the lower portion is lower than the upper portion of the front side member in the strength changing portion while securing the conventional strength and rigidity. Has an effect.

(A) is the side view seen from the vehicle left side which shows the vehicle front part structure which concerns on this Embodiment, (B) is a perspective view which expands and shows the principal part of the said vehicle front part structure. It is the side view seen from the vehicle left side which shows the vehicle front part structure concerning this Embodiment, (A) shows the state before a front collision, (B) has shown the state after front collision. It is the comparative example corresponding to FIG. 2 (A) and (B), respectively. It is the perspective view which expanded the principal part of the vehicle front part structure which concerns on other embodiment (1). (A) is the side view seen from the vehicle left side which shows the vehicle front part structure which concerns on other embodiment (2), (B) is the perspective view which expanded the principal part of the said vehicle front part structure. .

  FIG. 1 is a schematic side view of a vehicle body front portion 10 to which a vehicle front portion structure according to an embodiment of the present invention is applied, as viewed from the left. Note that an arrow FR appropriately shown in the drawing indicates a forward direction in the vehicle longitudinal direction, and an arrow UP indicates an upward direction in the vehicle vertical direction.

(Vehicle front structure)
FIG. 1A shows a side view of a vehicle body front portion 10 to which the vehicle front portion structure according to the present embodiment is applied as viewed from the left side of the vehicle, and shows the vehicle body front portion shown in FIG. A front side member 12 having a long rectangular cylindrical shape is provided at both ends in the vehicle width direction. As shown in FIG. 1 (A), the front side member 12 extends along the vehicle front-rear direction, and the vehicle front end portion of the front side member 12 is a front bumper disposed along the vehicle width direction. It is joined to the reinforcement 14. The front bumper reinforcement 14 may be directly joined to the front side member 12, but a crash box (not shown) may be interposed between the two.

  On the vehicle rear end side of the front side member 12, there is provided a kick portion 16 that inclines toward the vehicle lower side toward the vehicle rear. The vehicle rear side of the kick portion 16 extends substantially horizontally toward the vehicle rear, and the vehicle rear end portion of the front side member 12 is joined to a cross member (not shown).

  On the other hand, a suspension tower 18 is provided above the front side member 12 on the front end side of the vehicle. A dash panel 24 that partitions the engine room 20 and the vehicle compartment 22 is provided behind the suspension tower 18.

  Here, as shown in FIG. 1B, the strength changing portion P (bent portion) of the front side member 12 positioned behind the suspension tower 18 and ahead of the dash panel 24 in the vehicle (see FIG. 1B). (B) is an enlarged perspective view of the main part of FIG. 1 (A), and a concave bead 26 as a fragile part over the entire region in the vehicle width direction of the lower wall 12A located at the lower part of the front side member 12. Is provided.

  The concave bead 26 is formed in a shape in which the lower wall 12A of the front side member 12 is bent toward the upper wall 12B to form a substantially triangular shape in a side view. Thereby, in the strength changing part P of the front side member 12, the strength of the lower wall 12A of the front side member 12 is lower than that of the upper wall 12B.

  Here, although the concave bead 26 has a substantially triangular shape in a side view, the shape of the concave bead 26 is not limited to this. For example, although not shown, the concave bead may have an arc shape in a side view.

(Operations and effects in the vehicle front structure)
Generally, on the vehicle front end side of the front side member 12 shown in FIG. 2 (A), the compressive strength in the axial direction is set lower than the other parts of the front side member 12, and the front side collision ( When a frontal collision load is input to the front side member 12 during a so-called front collision, the front end side of the vehicle of the front side member 12 is compressed and deformed along the axial direction as shown in FIG. Is to be absorbed.

  In the present embodiment, as shown in FIGS. 1A and 1B, a concave bead 26 is provided on the lower wall 12 </ b> A of the front side member 12 in the strength changing portion P of the front side member 12. Thereby, in the strength changing part P of the front side member 12, the strength of the lower wall 12A of the front side member 12 is lower than that of the upper wall 12B.

  For this reason, when a frontal collision load is input to the front side member 12, the lower wall 12A of the front side member 12 tends to bend before the upper wall 12B in the strength changing portion P of the front side member 12. Thus, in the strength changing portion P of the front side member 12, the vehicle front side and the vehicle rear side of the strength changing portion P are close to each other on the lower wall 12A side of the front side member 12, and FIG. As shown, the front side member 12 bends upward. The impact energy is absorbed by the deformation of the front side member 12.

  On the other hand, in the vehicle body front portion 100 to which the vehicle front portion structure according to this embodiment is not applied, as shown in FIG. 3B, when the vehicle front end side of the front side member 102 is compressed and deformed along the axial direction, There is a possibility that the suspension tower 18 located above the front side member 102 may interfere with the dash panel 24 located behind the suspension tower 18 in the vehicle.

  Since the strength change portion P of the front side member 12 is located behind the suspension tower 18, if the front side member 12 bends upward in the strength change portion P, the suspension tower 18 tilts toward the vehicle front side. To do. As described above, since the dash panel 24 is disposed behind the suspension tower 18, when the suspension tower 18 tilts toward the vehicle front side, the suspension tower 18 moves away from the dash panel 24. Will be inclined.

  That is, according to the present embodiment, it is possible to specify the position (strength changing portion P) at which the front side member 12 is desired to be bent upward when it is deformed by the impact load input. Then, by using the deformation of the front side member 12 to tilt the suspension tower 18 toward the vehicle front side, interference between the suspension tower 18 and the dash panel 24 can be suppressed. For this reason, the compartment protection performance at the time of a front collision can be improved.

(Other embodiments)

(1) In this embodiment, as shown in FIG. 1B, in the strength changing portion P of the front side member 12, a concave bead 26 is provided as a fragile portion on the lower wall 12A of the front side member 12. . However, in the present embodiment, in the strength changing portion P of the front side member 12, it is only necessary to provide a fragile portion on the lower wall 12A so that the lower wall 12A has a lower strength than the upper wall 12B. It is not limited.

  For example, as shown in FIG. 4, a plurality of through holes 30 may be formed in the lower wall 28 </ b> A or the side wall 28 </ b> B in the strength changing portion P of the front side member 28. The through hole 30 may be formed in the lower wall 28A and the side wall 28B. In the above embodiment, since only the lower walls 12A and 28A of the front side members 12 and 28 are processed, the front side members 12 and 28 in this embodiment can be easily manufactured.

(2) In the above embodiment, the strength of the lower walls 12A and 28A is set to be lower than that of the upper walls 12B and 28C in the strength changing portion P of the front side members 12 and 28. , 28C may be set to be higher than the strength of the lower walls 12A, 28A.

  For example, as shown in FIGS. 5A and 5B, a reinforcing material 34 may be provided in the strength changing portion P of the front side member 32. For example, the reinforcing member 34 has a rectangular shape when viewed from the rear of the vehicle, and extends from the lower half of the front end portion 34A side to the lower half of the side wall 34B in the longitudinal direction in the vehicle side view toward the rear of the vehicle. An arcuate notch 36 is formed. The portion where the notch 36 is formed has a lower strength than the other portions. That is, the strength of the lower wall 34C of the reinforcing member 34 is lower than that of the upper wall 34D.

  Therefore, in the strength changing portion P of the front side member 32, the strength of the lower wall 32A side of the front side member 32 is lower than that of the upper wall 32B side. For this reason, in the said intensity change part P, the front side member 32 can be bent upwards.

  Further, such a reinforcing member 34 is provided in the front side member 32, and the front end portion 34A of the reinforcing member 34 is arranged in accordance with the position of the strength changing portion P. A difference in strength is obtained between the rear side. That is, since the strength on the front side of the vehicle is lower than that on the rear side of the vehicle with reference to the strength changing portion P of the front side member 32, the front side member 32 can be bent more reliably at the strength changing portion P. .

  That is, in the present embodiment, the front side member 32 can be bent upward in the vehicle by the strength changing portion P while securing the conventional strength and rigidity. Note that the reinforcing material 34 is not limited to this shape as long as the strength of the lower wall 34C can be set to be lower than that of the upper wall 34D. For example, the shape of the notch 36 may be square.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

10 Body front (vehicle front structure)
12 Front side member 12A Lower wall (lower side)
12B Upper wall (upper side)
18 Suspension tower 24 Dash panel 26 Concave bead (fragile part)
28 Front side member 28A Lower wall (fragile part)
28B Side wall (fragile part)
32 Front side member 34 Reinforcement material (reinforcement part)
P Strength change part

Claims (3)

A pair of suspension towers arranged on the left and right sides of the front of the vehicle;
A dash panel disposed behind the suspension tower and separating the engine room and the vehicle compartment;
A pair of front side members provided below the suspension tower and provided with kick portions that extend in the vehicle front-rear direction and incline toward the vehicle lower side toward the rear of the vehicle toward the rear end;
Said front side is located on the vehicle front than the rear of the vehicle and the dash panel and the kick portion of the suspension tower in the member, the strength of the lower side than the upper side in the vehicle vertical direction is set to be lower, the front side A strength changing portion that bends the member upward toward the vehicle and tilts the suspension tower toward the vehicle front side ;
A vehicle front structure having:   The vehicle front part structure according to claim 1, wherein a weak portion is provided at a lower portion of the front side member in the strength changing portion.   The vehicle front structure according to claim 1, wherein a reinforcing portion is provided on an upper portion of the front side member in the strength changing portion.