JP7255336B2 - Body front structure - Google Patents

Description

The present invention relates to a vehicle body front structure.

Among conventional vehicle body front structures, reinforcing members are provided in the dash panel and tire housing, and beads are formed on the reinforcing members to increase the rigidity of the front portion of the vehicle body, thereby improving collision performance. There is (for example, see Patent Document 1).

WO2013/080305

However, in the above-described conventional vehicle body front structure, reinforcing members are provided over the entire front part of the vehicle body, such as the dash panel and tire housing, so that it is possible to improve the rigidity of the front part of the vehicle body. , a complicated molding process is required, which may lead to high costs. Moreover, there is a problem that the addition of the reinforcing member causes a significant weight increase.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and its object is to prevent the front side frame from receiving an impact load from the front of the vehicle without complicated molding or addition of reinforcing members. Another object of the present invention is to provide a vehicle body front structure capable of effectively absorbing an impact load by receiving an input load from a curved portion and deforming the fragile portion toward the rear of the vehicle.

In order to solve the above-described problems of the prior art, the present invention provides a dash panel and a wheel house that are arranged in the front part of the vehicle body, a dash side panel that is arranged outside the dash panel in the vehicle width direction, and the dash panel. In the vehicle body front structure having a front side frame extending in the vehicle front-rear direction, the wheel house has a bulging surface portion that bulges inward of the vehicle, and the bulging surface portion is a curved portion curved along the dash panel; and a fragile portion arranged along the curved portion on the vehicle width direction inner side of the bulging surface portion, the front side A joint portion of the frame with the wheel house is arranged adjacent to the curved shape portion.

As described above, the vehicle body front structure according to the present invention includes a dash panel and a wheel house arranged at the front part of the vehicle body, a dash side panel arranged outside the dash panel in the vehicle width direction, and a vehicle body including the dash panel. The wheel house has a front side frame that is disposed on the front side and extends in the vehicle front-rear direction. The wheel house has a bulging surface portion that bulges toward the inside of the vehicle, and the bulging surface portion extends along the dash panel. A curved portion having a curved shape is provided, and a weakened portion arranged along the curved portion is provided on the inner side of the bulging surface portion in the vehicle width direction, and the front side frame and the wheel house are separated from each other. A joint is positioned adjacent to the curved profile.
Therefore, in the vehicle body front structure of the present invention, when an impact load is input to the front side frame from the front of the vehicle, it is transmitted to the dash panel through the joint with the wheelhouse adjacent to the curved portion. Therefore, an input load is received from the curved portion, and the fragile portion is crushed and deformed toward the rear of the vehicle, so that the impact load can be efficiently absorbed. Moreover, since the vehicle body front structure of the present invention does not require complicated molding or addition of reinforcing members, it is possible to provide an economically advantageous structure without incurring an increase in cost and weight.

FIG. 2 is a perspective view of the right side of the front portion of the vehicle body having the structure according to the embodiment of the present invention, viewed obliquely from above the front side of the vehicle; FIG. 2 is a perspective view of the inside of the vehicle on the right side of the front portion of the vehicle body having the structure according to the embodiment of the present invention, as seen obliquely from above on the rear side of the vehicle body. 1 is a perspective view of a vehicle body front portion having a structure according to an embodiment of the present invention, viewed from below the vehicle; FIG. 4 is a perspective view of the front portion of the vehicle body in FIG. 3 as seen from below the vehicle at another angle; FIG. 1 is a plan view of a vehicle body front portion having a structure according to an embodiment of the present invention, viewed from below the vehicle; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the illustrated embodiments.
1 to 5 show a vehicle body front structure according to an embodiment of the present invention. In the drawings, the direction of arrow Fr indicates the front of the vehicle, the direction of arrow O indicates the outside of the vehicle, and the direction of arrow U indicates the upper side of the vehicle.

1 to 5 show a vehicle body front structure according to an embodiment of the present invention. As shown in FIGS. 1 to 5, the vehicle body front structure of the present embodiment includes a dash panel 2 and a wheel house 3 arranged in the vehicle body front part 1, and a dash panel 2 arranged outside the dash panel 2 in the vehicle width direction. It has a side panel 4 and a front side frame 5 arranged on the vehicle front side of the dash panel 2 and extending in the vehicle front-rear direction. Although the dash panel 2 and the wheel house 3 of the present embodiment are integrally formed of one steel plate, they may be formed separately by joining a plurality of steel plates.
The dash panel 2 is a panel that extends across the entire vehicle width direction and partitions the engine room (or motor room) from the vehicle interior. It has an inclined wall portion 22 that extends slightly downward toward the rear of the vehicle and whose rear end portion is joined to the floor panel 6 . The wheel house 3 is provided on both left and right sides of the inclined wall portion 22 that constitutes the dash panel 2, and is curved so as to cover a front tire (not shown). is joined to the front side portion 4a of the dash side panel 4.
The vehicle body front structure of this embodiment includes a dash cross member 11 provided in the vehicle width direction on the front side of the dash panel 2, side sills 12 provided on both left and right sides of the floor panel 6 and extending in the vehicle front-rear direction, and side sills. A dash lower extension member 13 provided between 12 and the front side frame 5, a dash side front member 14 and a dash side extension member 15 provided at the vehicle front portion of the dash side panel 4, and the vehicle outer end portion being the front side frame. 5 and a suspension frame 17 and the like joined to the side member 16 and the like.

As shown in FIGS. 1 to 5, the wheel house 3 of this embodiment has a bulging surface portion 31 that bulges toward the inside of the vehicle. The bulging surface portion 31 has a curved shape (half) that protrudes toward the dash panel 2 side along the vehicle outer side lower portion of the vertical wall portion 21 and the vehicle outer side portion of the inclined wall portion 22 that constitute the dash panel 2 . It has a curved portion 32 that is arc-shaped. In addition, a weakened portion 33 is provided on the vehicle width direction inner side of the bulging surface portion 31 along the curved shape portion 32 and serves as a starting point of bending in the event of a frontal collision. It is formed in a bead shape extending along the shape portion 32 with a constant length. Moreover, as shown in FIG. 4, the joint portion 51 between the front side frame 5 and the wheel house 3 is arranged adjacent to the curved portion 32 over a predetermined range R, and the inclination at the joint portion 51 A reinforcing portion, which will be described later, is arranged so as to have rigidity with respect to the portion 51a. The joint portion 51 has such a positional relationship that it also extends to the fragile portion 33 .
As a result, when an impact load is applied to the front side frame 5 from the front of the vehicle, the load is input to the joint portion 51, and the fragile portion 33 provided along the curved portion 32 of the bulging surface portion 31 is crushed and deformed. and absorb impact loads.

Further, as shown in FIGS. 1 to 5, a plurality of fragile portions 33 (three in this embodiment) are provided along the curved portion 32 at intervals. In other words, the fragile portions 33 are not continuously provided, but intermittently arranged. there is Since such a holding portion 34 is present between the fragile portions 33, it is possible to control the stroke amount of impact absorption, and the surface rigidity of the bulging surface portion 31 is ensured. It has a structure that can suppress the panel vibration of

1, 3, 4 and 5, in the vehicle body front structure of the present embodiment, the joint 51 of the front side frame 5 with the wheel house 3 is a fragile portion when viewed from the side of the vehicle. 33 so as to overlap with each other in the vertical direction of the vehicle. Moreover, the fragile portion 33 is arranged on the rear side of the vehicle with respect to the joint portion 51 of the front side frame 5 . By arranging the joint portion 51 and the fragile portion 33 in such a positional relationship, when an impact load is input to the front side frame 5 from the front of the vehicle, the load on the joint portion 51 of the front side frame 5 is applied to the wheel. It is configured to smoothly and reliably transmit to the fragile portion 33 of the house 3 and promote the load absorbing effect.

Further, in the vehicle body front structure of the present embodiment, the bulging surface portion 31 of the wheel house 3 is provided with a reinforcing portion 35 extending from the outside of the vehicle toward the fragile portion 33, as shown in FIGS. there is That is, the reinforcing portion 35 extends in a direction intersecting the direction in which the fragile portion 33 extends. Moreover, the reinforcement part 35 of this embodiment is formed in the shape of a bead extending with a certain length, and is provided in plurality (three in this embodiment) at intervals in the vehicle front-rear direction. As a result, even if the wheel housing 3 has the bulging surface portion 31, the load input to the fragile portion 33 can be received by the reinforcing portion 35, the shape of the wheel housing 3 is maintained, and the vehicle interior space is increased. protected.
In particular, as shown in FIGS. 3 to 5, when the reinforcing portion 35 is arranged in front of the vehicle with respect to the dash lower extension member 13, the effect of protecting the vehicle interior space is likely to be exhibited. In addition, the front side frame 5 has a curved portion 5a toward the outside of the vehicle, so that the load from the front of the vehicle is easily dispersed to the outside of the vehicle. In order to utilize the load absorbing portion of the fragile portion 33, the reinforcing portion 35 is used to control the direction of load transmission.

On the other hand, in the vehicle body front portion structure of the present embodiment, as shown in FIG. A dash panel reinforcement 7 joined to the curved portion 32 of the wheel house 3 is provided. This dash panel reinforcement 7 is provided to increase the rigidity of the inclined wall portion 22 of the dash panel 2 where an accelerator pedal (not shown) is arranged, and the body portion 71 of the dash panel reinforcement 7 is , is joined to the upper surface of the inclined wall portion 22 . As a result, the dash panel reinforcement 7 is arranged along the curved portion 32 on the side of the wheel house 3, the rigidity of the curved portion 32 is improved, and an impact load is input to the front portion 1 of the vehicle body. In this case, load transmission to the fragile portion 33 is facilitated.

Thus, the vehicle body front structure according to the embodiment of the present invention includes the dash panel 2 and the wheel house 3 arranged at the vehicle front part 1, and the dash side panel 4 arranged outside the dash panel 2 in the vehicle width direction. and a front side frame 5 which is arranged on the vehicle front side of the dash panel 2 and extends in the vehicle front-rear direction. The wheel house 3 has a bulging surface portion 31 that bulges toward the inside of the vehicle, and the bulging surface portion 31 has a curved portion 32 that curves along the dash panel 2 . In addition, a weakened portion 33 arranged along the curved portion 32 is provided on the inner side of the bulging surface portion 31 in the vehicle width direction. 32 are located adjacent to each other.
Therefore, according to the vehicle body front structure of the present embodiment, when an impact load is input to the front side frame 5 from the front of the vehicle at the time of a collision, the impact load is applied to the dash panel 2 through the joint 51 with the wheel house 3 . , and the input load is received from the curved portion 32, the fragile portion 33 is crushed rearward of the vehicle and reliably deformed to effectively absorb the impact load. In addition, the vehicle body front structure of the present invention can be obtained by a simple molding process without performing a complicated molding process, and there is no need to add a reinforcing member, so there is no increase in cost or weight. , a vehicle body having an economically advantageous structure can be provided.

In addition, in the vehicle body front structure of the present embodiment, the joint portion 51 of the front side frame 5 is arranged so as to vertically overlap the weak portion 33 when viewed from the side of the vehicle, and is located on the rear side of the vehicle relative to the joint portion 51. Since the fragile portion 33 is arranged, when an impact load is input to the front side frame 5 from the front of the vehicle, the impact load transmitted to the joint portion 51 of the front side frame 5 is easily transferred to the fragile portion 33 of the wheel house 3. , the absorption of the load due to the collapse of the fragile portion 33 can be accelerated, and the impact absorption performance can be improved.

Furthermore, in the vehicle body front portion structure of the present embodiment, the bulging surface portion 31 is provided with the reinforcing portion 35 extending from the outside of the vehicle toward the fragile portion 33, so that the wheel house 3 has the bulging surface portion 31. The load input to the fragile portion 33 can be received by the reinforcing portion 35 even when the reinforced portion 35 is in place. Therefore, according to the vehicle body front structure of this embodiment, even if an impact load is applied at the time of a collision, the shape of the wheel house 3 can be maintained, and the vehicle interior space can be secured and protected.

In the vehicle body front structure of the present embodiment, the dash panel 2 is provided with the dash panel reinforcement 7 extending from the dash panel 2 located inside the vehicle and joined to the curved portion 32. The dash panel reinforcement 7 is provided along the curved portion 32 on the side of the wheel house 3, and the rigidity of the curved portion 32 can be improved. 33, and the impact load absorption efficiency can be promoted.

In addition, in the vehicle body front structure of the present embodiment, since a plurality of fragile portions 33 are provided at intervals along the curved portion 32, the holding portion 34 exists between the fragile portions 33. As a result, it is possible to control the stroke amount of shock absorption, maintain the surface rigidity of the bulging surface portion 31, and reduce panel vibration of the wheel house 3 and the like during normal operation.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible based on the technical idea of the present invention.

For example, in the above-described embodiment, three weakened portions 33 are provided. More than one fragile portion 33 may be provided.

1 Vehicle front part 2 Dash panel 3 Wheel house 3a Vehicle width direction outer side part 4 Dash side panel 4a Front side part 5 Front side frame 7 Dash panel reinforcement 21 Vertical wall part 21a Vehicle width direction outer side part 22 Inclined wall part 31 Bulging surface portion 32 Curved shape portion 33 Weak portion 34 Holding portion 35 Reinforcing portion 51 Joint portion between front side frame and wheel house R Range of joint portion

Claims (5)

A dash panel and a wheel house arranged at the front part of the vehicle body, a dash side panel arranged outside the dash panel in the vehicle width direction, and a front side frame arranged at the vehicle front side of the dash panel and extending in the vehicle front-rear direction. In a vehicle body front structure having
The wheel house has a bulging surface portion that bulges toward the inside of the vehicle. The bulging surface portion has a curved shape portion that curves along the dash panel. is provided with a fragile portion arranged along the curved shape portion,
The vehicle body front structure, wherein a joint portion of the front side frame to the wheel house is arranged adjacent to the curved portion. The joint portion of the front side frame is arranged so as to vertically overlap the weakened portion when viewed from the side of the vehicle, and the weakened portion is arranged on the rear side of the vehicle relative to the joint portion. The vehicle body front structure according to claim 1. 3. The vehicle body front structure according to claim 1, wherein the bulging surface portion is provided with a reinforcing portion extending from the outside of the vehicle toward the fragile portion. 4. The dash panel according to any one of claims 1 to 3, wherein the dash panel is provided with a dash panel reinforcement extending from the dash panel positioned inside the vehicle and joined to the curved portion. The vehicle body front structure described in . The vehicle body front structure according to any one of claims 1 to 4, wherein a plurality of said weakened portions are provided at intervals along said curved portion.

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