JP6387817B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure.

  Patent Document 1 below discloses a vehicle front structure. Specifically, a front side member extending along the vehicle front-rear direction, a gusset attached to the outer side of the front side member in the vehicle width direction, and a cross section provided inside the front side member and orthogonal to the vehicle vertical direction And a reinforcing member having a hat shape. The reinforcing member is disposed at a position corresponding to the end of the tapered portion of the gusset. Therefore, the collision load input to the gusset at the time of the vehicle front collision can be smoothly transmitted to the front side member by the reinforcing member.

JP 2013-193571 A

  However, according to the configuration disclosed in Patent Document 1, in the case of a vehicle frontal collision, particularly when the vehicle frontal collision occurs outside the front side member in the vehicle width direction (hereinafter, this collision mode is referred to as “micro lap collision”) When the vehicle collides with the front of the vehicle obliquely from the front side (hereinafter referred to as “oblique collision”), the front side member is moved inward in the vehicle width direction by the collision load input to the front side member. Deforms while breaking. At this time, the reinforcing member is deformed so that the front wall portion and the rear wall portion facing the front wall portion are separated from each other, but since no means for suppressing this deformation is provided, the deformation is not suppressed. That is, since the deformation of the front side member is not suppressed at the time of a vehicle frontal collision, especially at the time of a minute lap collision or an oblique collision, the energy absorption amount of the front side member does not increase, and the above prior art is improved in this respect. There is room.

  In view of the above problems, the present invention has an object to obtain a vehicle front structure that can increase the energy absorption amount of a front side member that is deformed at the time of a vehicle frontal collision, particularly at the time of a minute lap collision or an oblique collision. To do.

  According to a first aspect of the present invention, a vehicle front portion structure includes a front side member inner extending in the vehicle front-rear direction and a front side member inner provided on the outer side in the vehicle width direction of the front side member inner and closed by the front side member inner. A front side member having a front side member outer that forms a cross section, and a front side member formed with a fragile portion that is bent inward in the vehicle width direction when a collision load from the front of the vehicle is input to the front side member outer, A side wall portion extending along the direction and provided on the inner side of the vehicle width direction outer side surface of the front side member inner, and extending from the front end portion of the side wall portion in the vehicle front-rear direction to the vehicle width direction outer side and A front wall portion disposed on the vehicle front side of the fragile portion, and the fragile portion extending from the rear end portion of the side wall portion in the vehicle front-rear direction to the vehicle width direction outside. A rear wall portion disposed on the rear side of the vehicle, and the front wall portion and the rear wall portion that extend in directions away from each other in the vehicle width direction and extend in the vehicle width direction of the front side member outer And a reinforcing member having a pair of flange portions joined to the inner side surface.

  According to the first aspect of the present invention, the reinforcing member has a hat-shaped cross section perpendicular to the vehicle vertical direction at the side wall portion, the front wall portion, the rear wall portion, and the flange portion. The reinforcing member has a flange portion coupled to the inner side surface of the front side member outer, and is disposed so that a weak portion is provided between the front wall portion and the rear wall portion. Therefore, when a collision load is input to the front side member during a vehicle frontal collision, especially during a minute lap collision or oblique collision, a bending moment is generated that displaces the fragile part of the front side member inward in the vehicle width direction. To do. At this time, deformation of the front side member is suppressed by the front wall portion and the rear wall portion of the reinforcing member extending outward in the vehicle width direction. When a larger collision load is input to the front side member, the front side member is deformed while being bent inward in the vehicle width direction with the fragile portion as the center. At this time, the front wall portion of the reinforcing member is arranged so that the end portion on the inner side in the vehicle width direction, that is, the end portion on the outer side in the vehicle width direction is close to the rear wall portion of the reinforcing member with the front end portion of the side wall portion as the center. Deform. At the same time, the rear wall portion of the reinforcing member is deformed so that the end portion on the inner side in the vehicle width direction, that is, the outer end portion in the vehicle width direction, close to the front wall portion of the reinforcing member, is centered on the rear end portion of the side wall portion. To do. That is, the distance in the vehicle front-rear direction between the end portion of the front wall portion on the outer side in the vehicle width direction and the end portion of the rear wall portion on the outer side in the vehicle width direction is reduced. When the deformation of the front wall portion and the rear wall portion proceeds, the inner side surface of the front side member outer is allowed to enter the cross-section inward of the reinforcing member while sandwiching the inner side surface of the front side member outer. Thereby, a front wall part, a rear wall part, and a side wall part become a substantially triangular shape by planar cross section view, and the reinforcement member changes from the open cross section to the state close | similar to a closed cross section. As a result, the rigidity of the reinforcing member is increased, the collapse of the cross section of the front side member is suppressed, and the deformation load of the front side member increases.

Vehicle front structure according to the present invention of claim 1 Symbol placement is when the vehicle frontal collision, excellent that particular can increase the amount of energy absorption of the front side member to deform in a small overlap collision or an oblique collision or the like Has an effect.

It is a top view which shows the front side member provided with the vehicle front part structure which concerns on 1st embodiment. It is an expanded sectional view showing the important point of the front side member provided with the vehicle front part structure concerning a first embodiment. It is a top view showing the state at the time of a minute lap collision of a front side member provided with the vehicle front part structure concerning a first embodiment. It is an expanded sectional view showing the important point at the time of the minute lap collision of the front side member provided with the vehicle front part structure concerning a first embodiment. It is a top view which shows the front side member provided with the vehicle front part structure which concerns on a reference example . It is a top view which shows the front side member provided with the vehicle front part structure which concerns on contrast.

(First embodiment)
Hereinafter, a first embodiment of a vehicle front structure according to the present invention will be described with reference to FIGS. In these drawings, the arrow FR indicates the front side in the vehicle longitudinal direction, and the arrow OUT indicates the vehicle width direction outside.

  As shown in FIG. 1, the front side member 10 includes a front side member inner 12 that extends in the vehicle front-rear direction, and a front side member outer 14 that is disposed outside the front side member inner 12 in the vehicle width direction. It is configured to include. The front side member inner 12 and the front side member outer 14 are coupled so that a cross section perpendicular to the vehicle longitudinal direction is a closed cross section.

  A fragile portion 16 is formed in the front side member outer 14. The fragile portion 16 is configured such that the front side member outer 14 and the front side member inner 12 are narrowly dimensioned by bending the front side member outer 14 inward in the vehicle width direction. In the present embodiment, the fragile portion 16 is configured such that the dimensions of the front side member outer 14 and the front side member inner 12 in the vehicle width direction are set narrow. However, the present invention is not limited to this, and the front side member outer is not limited thereto. It is good also as a structure which provided the hole in 14 plate | board thickness directions, or provided the notch.

  A crash box 20 is attached to the front end portion 18 of the front side member 10. A bumper force 24 extending substantially in the vehicle width direction is attached to the front end 22 of the crash box 20. A resin front bumper (not shown) is attached to the front side in the vehicle longitudinal direction of the bumper reinforcement 24.

  As shown in FIG. 2, a reinforcing member 26 is provided inside the front side member 10. The reinforcing member 26 includes a side wall 28 extending in the vehicle front-rear direction, a front wall 30 positioned on the front side of the side wall 28 in the vehicle front-rear direction, and a rear wall positioned on the rear side of the side wall 28 in the vehicle front-rear direction. A portion 32 and flange portions 34 and 36 formed on the front wall portion 30 and the rear wall portion 32 are configured. The side wall portion 28 is disposed inside the inner side surface 38 of the front side member inner 12 so as to face the inner side surface 38 of the front side member inner 12.

  A front wall portion 30 extending toward the outer side in the vehicle width direction is provided at the front end portion 40 of the side wall portion 28. A flange portion 34 extending substantially toward the front side in the vehicle front-rear direction is provided at an end portion 42 on the outer side in the vehicle width direction of the front wall portion 30. The flange portion 34 extends along the inner side surface 46 of the front side member outer 14 and is coupled to the inner side surface 46 by arc welding.

  A rear wall portion 32 extending toward the outer side in the vehicle width direction is provided at the rear end portion 48 of the side wall portion 28. That is, the front wall portion 30 and the rear wall portion 32 are in a facing positional relationship. A flange portion 36 extending substantially rearward in the vehicle front-rear direction is provided at an end portion 50 of the rear wall portion 32 on the outer side in the vehicle width direction. The flange portion 36 extends along the inner side surface 46 of the front side member outer 14. That is, the flange portion 34 and the flange portion 36 are extended in a pair and in a direction away from each other. The flange portion 34 and the flange portion 36 are joined to the inner side surface 46 by arc welding.

  The reinforcing member 26 has a substantially hat-shaped cross section perpendicular to the vehicle vertical direction from the above-described configuration. The substantially hat-shaped cross-sectional opening 54 is directed to the outer side in the vehicle width direction and is disposed so as to face the fragile portion 16 formed in the front side member outer 14. That is, the fragile portion 16 is disposed between the front wall portion 30 and the rear wall portion 32.

(Operation and effect of the first embodiment)
Next, the operation and effect of this embodiment will be described.

  Here, the operation and effect of this embodiment will be described using the proportionality shown in FIG. In addition, about the same component as this embodiment, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 6, a gusset 102 is attached to the outer side in the vehicle width direction of the front side member 100 extending along the vehicle longitudinal direction. The gusset 102 is formed in a substantially triangular shape in plan view, and a main body portion 104 and a front end portion 106 disposed along the front side member 100 are disposed on the outer side in the vehicle width direction, and the vehicle front-rear direction rear side. And a taper portion 108 that is inclined inward in the vehicle width direction as it goes to the vehicle. A lower member 110 is attached to the front end portion 106 of the tapered portion 108 on the outer side in the vehicle width direction.

  Inside the front side member 100, a reinforcing member 112 having a substantially hat-shaped cross section perpendicular to the vehicle vertical direction is provided. The reinforcing member 112 includes a side wall 114 extending in the vehicle front-rear direction, a front wall 116 positioned on the front side of the side wall 114 in the vehicle front-rear direction, and a rear wall positioned on the rear side of the side wall 114 in the vehicle front-rear direction. Part 118 and flange parts 120 and 122 formed on front wall part 116 and rear wall part 118. The side wall portion 114 is disposed inside the inner side surface 124 of the front side member 100 on the outer side in the vehicle width direction so as to face the inner side surface 124 of the front side member 100 on the outer side in the vehicle width direction. Further, the side wall 114 is disposed at a position corresponding to the end 126 of the tapered portion 108 of the gusset 102, that is, the intersection of the inclined direction of the tapered portion 108 and the front and rear direction of the front side member 100.

  A flange portion 120 extending substantially toward the front side in the vehicle front-rear direction is provided at an end portion 130 on the vehicle width direction inner side of the front wall portion 116 extending from the front end portion 128 of the side wall portion 114 toward the vehicle width direction inner side. Is provided. The flange portion 120 extends along the inner side surface 136 of the front side member 100 in the vehicle width direction, and is coupled to the inner side surface 136 by arc welding.

  Further, an end portion 140 on the outer side in the vehicle width direction of the rear wall portion 118 that extends from the rear end portion 138 of the side wall portion 114 toward the inner side in the vehicle width direction extends substantially rearward in the vehicle front-rear direction. A flange portion 122 is provided. The flange portion 122 extends along the inner side surface 136 of the front side member 100 and is coupled to the inner side surface 136 by arc welding.

  With the above-described configuration, the reinforcing member 112 has a substantially hat-shaped cross section orthogonal to the vehicle vertical direction. The substantially hat-shaped cross-sectional opening 144 is directed inward in the vehicle width direction and is disposed at a position corresponding to the end 126 of the tapered portion 108. Therefore, the collision load input to the gusset 102 at the time of the front collision of the vehicle is smoothly transmitted to the front side member 100 by the reinforcing member 112.

  However, in the case of a frontal collision of the vehicle, particularly in the case of a minute lap collision or an oblique collision, the front side member 100 is centered on the end 126 of the tapered portion 108 where the load is concentrated by the collision load input to the front side member 100. And deforms while folding inward in the vehicle width direction. At this time, the reinforcing member 112 is deformed so that the front wall portion 116 and the rear wall portion 118 facing the front wall portion 116 are separated from each other, but no means for suppressing this deformation is provided. Deformation is not suppressed. That is, since the deformation of the front side member 100 is not suppressed at the time of a minute lap collision or an oblique collision, the amount of energy absorption of the front side member 100 does not increase, and there is room for improvement in this respect.

  On the other hand, in this embodiment, as shown in FIGS. 1 and 2, the reinforcing member 26 is orthogonal to the vehicle vertical direction with the side wall portion 28, the front wall portion 30, the rear wall portion 32, and the flange portions 34 and 36. The cross-sectional shape to be formed is a hat-shaped shape. The reinforcing member 26 has flange portions 34 and 36 coupled to the inner side surface 46 of the front side member outer 14, and is disposed so that the fragile portion 16 is sandwiched between the front wall portion 30 and the rear wall portion 32. Yes. Therefore, when a collision load is input to the front side member 10 at the time of frontal vehicle collision, particularly at the time of a minute lap collision or oblique collision, a bending that displaces the fragile portion 16 of the front side member 10 inward in the vehicle width direction. A moment is generated. At this time, the deformation of the front side member 10 is suppressed by the front wall portion 30 and the rear wall portion 32 of the reinforcing member 26 extending outward in the vehicle width direction. When a larger collision load is input to the front side member 10, the front side member 10 is deformed while being bent inward in the vehicle width direction with the fragile portion 16 as the center, as shown in FIG. At this time, as shown in FIG. 4, the front wall portion 30 of the reinforcing member 26 has an end portion 42 on the vehicle width direction outer side centering on the end portion on the inner side in the vehicle width direction, that is, the front end portion 40 of the side wall portion 28. Is deformed so as to approach the rear wall portion 32 of the reinforcing member 26. At the same time, the rear wall portion 32 of the reinforcing member 26 has an end portion on the inner side in the vehicle width direction, that is, an end portion 50 on the outer side in the vehicle width direction centering on the rear end portion 48 of the side wall portion 28. Deforms to be close to. That is, the distance in the vehicle front-rear direction between the end portion 42 on the outer side in the vehicle width direction of the front wall portion 30 and the end portion 50 on the outer side in the vehicle width direction of the rear wall portion 32 decreases. When the deformation of the front wall portion 30 and the rear wall portion 32 proceeds, the inner side surface 46 is allowed to enter the cross-section inward of the reinforcing member 26 while sandwiching the inner side surface 46 of the front side member outer 14. Thereby, the front wall part 30, the rear wall part 32, and the side wall part 28 become a substantially triangular shape in a plan view, and the reinforcing member 26 changes from an open section to a state close to a closed section. As a result, the rigidity of the reinforcing member 26 is increased, the collapse of the cross section of the front side member 10 is suppressed, and the deformation load of the front side member 10 increases. As a result, the energy absorption amount of the front side member 10 that is deformed at the time of a vehicle frontal collision, in particular, at the time of a minute lap collision or an oblique collision can be increased.

( Reference example )
Next, a vehicle front structure according to a reference example of the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

The vehicle front structure according to this reference example is basically the same as that of the first embodiment, and has two L-shaped flanges facing the outer side surface 56 of the front side member outer 14 in the vehicle width direction as reinforcing members 55. 58 is provided.

  In other words, the L-shaped flange 58 has an L-shaped cross section perpendicular to the vehicle vertical direction between the flange portion 60 and the standing wall portion 62. One of the L-shaped flanges 58 has a flange portion 60 on the outer side surface 56 of the front side member outer 14 in the vehicle width direction so as to be disposed on the front side in the vehicle front-rear direction with respect to the fragile portion 16 of the front side member outer 14. It is attached by welding or the like. Further, the flange portion 60 is arranged on the outer side surface 56 of the front side member outer 14 in the vehicle width direction so that the other L-shaped flange 58 is disposed on the rear side in the vehicle front-rear direction with respect to the fragile portion 16 of the front side member outer 14. Are attached by welding or the like. The one L-shaped flange 58 and the other L-shaped flange 58 are attached to the outer surface 56 so that the standing wall portions 62 face each other. In other words, the fragile portion 16 is sandwiched between the standing wall portion 62 of one L-shaped flange 58 and the standing wall portion 62 of the other L-shaped flange 58.

( Operation / effect of the reference example )
Next, the operation and effect of this reference example will be described.

  According to the above configuration, the reinforcing member 55 is configured to include the one standing wall portion 62 and the other standing wall portion 62. The one standing wall 62 and the other standing wall 62 are each provided with a flange 60 extending substantially in the vehicle front-rear direction from the end 68 on the inner side in the vehicle width direction. The reinforcing member 55 has a flange portion 60 coupled to the outer side surface 56 of the front side member outer 14, and the weakened portion 16 is provided between the one standing wall portion 62 and the other standing wall portion 62. Has been placed. Therefore, when a collision load is input to the front side member 10 at the time of frontal vehicle collision, particularly at the time of a minute lap collision or oblique collision, a bending that displaces the fragile portion 16 of the front side member 10 inward in the vehicle width direction. A moment is generated. The front side member 10 is deformed while being bent inward in the vehicle width direction with the fragile portion 16 as the center. At this time, one of the standing wall portions 62 of the reinforcing member 55 is deformed so as to be close to the other standing wall portion 62 opposite to the end portion 70 on the outer side in the vehicle width direction with the end portion 68 on the inner side in the vehicle width direction as a center. . At the same time, the other standing wall portion 62 of the reinforcing member is deformed so as to approach one standing wall portion 62 opposite to the end portion 70 on the outer side in the vehicle width direction, centering on the end portion 68 on the inner side in the vehicle width direction. That is, the distance in the vehicle front-rear direction between the end portion 70 on the outer side in the vehicle width direction of the one standing wall portion 62 and the end portion 70 on the outer side in the vehicle width direction on the other standing wall portion 62 decreases. When the deformation of the one standing wall portion 62 and the other standing wall portion 62 proceeds, the one standing wall portion 62, the other standing wall portion 62, and the outer surface 56 of the front side member outer 14 become substantially triangular in a plan view. The reinforcing member 55 changes from an open section to a state close to a closed section. As a result, the rigidity of the reinforcing member 55 increases and the deformation load of the front side member 10 increases. As a result, the energy absorption amount of the front side member 10 that is deformed at the time of a vehicle frontal collision, in particular, at the time of a minute lap collision or an oblique collision can be increased.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above, and various modifications other than those described above can be implemented without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 Front side member 12 Front side member inner 14 Front side member outer 16 Fragile part 26 Reinforcement member 28 Side wall part 30 Front wall part 32 Rear wall part 34 Flange part 36 Flange part 38 Inner side surface 40 Front end part 42 End part 46 Inner side surface 48 Rear end portion 50 End portion 55 Reinforcement member 56 Outer side surface 60 Flange portion 62 Standing wall portion 68 End portion

Claims (1)

A front side member inner that extends in the vehicle front-rear direction, and a front side member outer that is provided on the outer side in the vehicle width direction of the front side member inner and forms a closed section with the front side member inner, A front side member formed with a fragile portion that bends inward in the vehicle width direction when a collision load from the front of the vehicle is input to the front side member outer;
A side wall portion extending along the vehicle front-rear direction and provided on the inner side of the vehicle width direction outer side surface of the front side member inner, and extending from the front end portion of the side wall portion in the vehicle front-rear direction to the vehicle width direction outer side. And a front wall portion disposed on the vehicle front side of the fragile portion, and a rear wall portion extending from the rear end portion in the vehicle front-rear direction of the side wall portion to the vehicle width direction outer side and disposed on the vehicle rear side of the fragile portion. A pair of a wall portion and a front wall portion and a rear wall portion that extend in the direction away from each other in the vehicle width direction outer side and are joined to the vehicle width direction inner side surface of the front side member outer A reinforcing member having a flange portion;
Vehicle front structure having.

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