JP2015096392A - Vehicle front part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle front part structure which enables a desired moment to act on a front side member during a head-on collision such as a fine lap collision.SOLUTION: A vehicle front part structure 10 includes: a front side member 12 provided at a vehicle front part and extending in a vehicle fore and aft direction; an apron upper member 14 provided at a position, which is located at the outer side of the front side member 12 when viewed in a vehicle width direction and at the vehicle upper side, and extending in the vehicle fore and aft direction; an extension part 16 extending from the apron upper member 14 to the vehicle front side, the extension part 16 including a front end 16A disposed at the vehicle front side relative to the front side member 12; and a gusset 18 provided between the front side member 12 and the extension part 16 and connecting the front side member 12 with the extension part 16 in the vehicle width direction, the gusset 18 including a front end 18B disposed at the vehicle rear side relative to a front end 12A of the front side member 12 and the front end 16A of the extension part 16.

Description

  The present invention relates to a vehicle front structure.

  In a vehicle front part structure including a front side member provided at the front part of the vehicle and an apron upper member provided on the vehicle width direction outer side and the vehicle upper side of the front side member, Patent Document 1 discloses an apron reinforcement. A connecting member is extended from the attachment (apron upper member) to the front of the vehicle, and the front end of the connecting member and the front end of the front side frame (front side member) are arranged at the same position in the vehicle front-rear direction and connected by a surface portion. Is disclosed.

JP 2005-231435 A

  By the way, in an offset frontal collision in which a collision load is input to the outer side in the vehicle width direction of the front side member (hereinafter referred to as “minute lap collision” as appropriate), the front side member is folded inward in the vehicle width direction. By applying a moment in the direction, it is possible to generate a lateral force on the inner side in the vehicle width direction and move the vehicle away from the collision object. However, in the vehicle front part structure of Patent Document 1, the front end of the connecting member and the front end of the front side member are arranged at the same position in the vehicle front-rear direction, so that the apron upper member is the vehicle against the input of the collision load. It may stretch in the front-rear direction. For this reason, there is room for improvement from the viewpoint of applying a desired moment to the front side member.

  In consideration of the above facts, an object of the present invention is to provide a vehicle front structure that can apply a desired moment to a front side member during a frontal collision such as a minute lap collision.

  According to a first aspect of the present invention, a vehicle front portion structure is provided at a front portion of a vehicle and extends in a vehicle front-rear direction, on a vehicle width direction outer side and a vehicle upper side of the front side member. An apron upper member that extends in the vehicle front-rear direction, extends from the apron upper member to the vehicle front side, and has a front end disposed on the vehicle front side from the front side member, and the front Provided between the side member and the extension portion, connecting the front side member and the extension portion in the vehicle width direction, and having a front end on the vehicle rear side from a front end of the front side member and a front end of the extension portion. Arranged gussets.

  According to the vehicle front portion structure according to the first aspect of the present invention, the front side member is provided in the vehicle front portion, and the apron upper is provided on the vehicle width direction outer side and the vehicle upper side of the front side member. Members are provided. Further, an extension portion extends from the apron upper member toward the vehicle front side, and the extension portion and the front side member are connected in the vehicle width direction by a gusset. Here, since the extension portion is disposed on the vehicle front side from the front side member, at the time of a frontal collision such as a minute lap collision, the collision body contacts the extension portion before the front side member, and the apron upper member is moved to the vehicle. Deform inward. Thereby, the apron upper member does not stretch in the vehicle width direction front-rear direction, and a desired moment can be applied to the front side member.

  Further, the front end of the gusset is disposed on the vehicle rear side from the front end of the front side member and the front end of the extension portion. Thereby, it is possible to suppress the collision load from acting on the extension part and the gusset at the time of a frontal collision such as a micro lap collision, and to suppress the moment opposite to the desired moment from acting on the front side member. it can. Furthermore, compared to the case where the front end of the gusset and the front end of the front side member are arranged at the same position in the vehicle longitudinal direction, the load in the shear direction acting on the gusset is reduced, and the gusset and the front side member are separated. Can be suppressed.

  As described above, the vehicle front structure according to the present invention has an excellent effect that a desired moment can be applied to the front side member at the time of a frontal collision such as a minute lap collision.

It is a top view which shows the vehicle front part structure which concerns on embodiment of this invention. It is a top view which shows the state which the collision body collided with the apron brace at the time of the micro lap collision of the vehicle front part structure which concerns on embodiment of this invention. It is a top view which shows the state which the extension part deform | transformed at the time of the micro lap collision of the vehicle front part structure which concerns on embodiment of this invention. It is a top view which shows the state which the front side member deform | transformed at the time of the micro lap collision of the vehicle front part structure which concerns on embodiment of this invention. It is a top view which shows the state which a crash box collapses at the time of the diagonal collision of the vehicle front part structure which concerns on embodiment of this invention.

  Hereinafter, a vehicle front structure 10 according to an embodiment of the present invention will be described with reference to the drawings. Note that an arrow FR appropriately shown in each figure indicates the vehicle front side, and an arrow OUT indicates the vehicle width direction outer side (the vehicle left side). Further, in the following description, when using the front / rear, up / down, and left / right directions, the front / rear direction of the vehicle, the up / down direction of the vehicle up / down direction, and the left / right direction in the traveling direction are indicated.

(Configuration of vehicle front structure)
As shown in FIG. 1, the vehicle front structure 10 according to the present embodiment mainly includes a front side member 12, an apron upper member 14, an apron brace 16 as an extension portion, and a gusset 18. . Further, the vehicle front structure 10 is formed symmetrically with respect to the vehicle width direction central portion, and in the following description, the configuration on the left side of the vehicle front structure 10 is illustrated and described. The illustration and description of the configuration on the right side of FIG.

  The front side member 12 is disposed on the outer side in the vehicle width direction than the central portion in the vehicle width direction of the front portion of the vehicle, and extends in the vehicle front-rear direction. Further, as an example, the front side member 12 includes a front side member inner whose cross-sectional shape cut along the vehicle width direction is substantially U-shaped, and a substantially flat plate-like shape that is formed on the open side of the front side member inner. The front side member outer is configured to be closed, and these members are formed in a closed cross-section by being coupled to each other by spot welding or the like.

  The front end 12A of the front side member 12 is provided with a front flange 12B bent upward of the vehicle. A substantially flat bracket 20 is overlapped with the front flange 12B and fastened by bolts and weld nuts. Has been. In addition, between the bracket 20 and the front flange 12B, a side member of a radiator support (not shown) disposed inside the front side member 12 in the vehicle width direction is clamped together. Further, the front side member 12 and the bracket 20 may be joined by a method such as spot welding.

  An apron upper member 14 is provided outside the front side member 12 in the vehicle width direction and above the vehicle. The apron upper member 14 extends in the vehicle front-rear direction, and includes, for example, an apron upper member outer and an apron upper member inner divided in the vehicle vertical direction. The apron upper member 14 is formed in a closed cross section by connecting these members together by spot welding or the like. Further, the rear end portion of the apron upper member 14 is coupled to a front pillar (not shown).

  Further, the apron upper member 14 is inclined toward the vehicle lower side toward the front of the vehicle, and the apron upper member 14 is curved in a substantially arc shape with the lower surface of the apron upper member 14 opened downward. Further, an apron brace 16 is provided at the front end portion 14 </ b> A of the apron upper member 14 as an extended portion that extends continuously from the apron upper member 14 toward the front side of the vehicle.

  As an example, the apron brace 16 includes an apron brace outer and an apron brace inner divided in the vehicle vertical direction. The apron brace 16 is formed in a closed cross section by connecting these members together by spot welding or the like. Further, the apron brace 16 is inclined to the vehicle lower side and curved inward in the vehicle width direction toward the front of the vehicle, and the front end portion of the apron brace 16 has substantially the same height as the front side member 12. positioned. However, the height of the front end portion of the apron brace 16 may be different from the height of the front side member 12.

  The front end of the apron brace 16 is provided with an upper flange 16B that is bent upward from the end in the vehicle width direction and a lower flange (not shown) that is bent downward of the vehicle. It is combined with a gusset 18 described later.

  Here, in this embodiment, the front end part of the apron brace 16 is comprised by the crushable member 22 as an example. The crushable member 22 is a hollow member having an open rear end side, and is formed in a substantially triangular shape in plan view. A mounting piece 22A extends from the rear end to the vehicle rear side on the upper and lower surfaces of the crushable member 22, and a bolt hole through which a bolt is inserted is formed in the mounting piece 22A. Then, the attachment piece 22A and the apron brace 16 are fastened and connected by a bolt 24 and a weld nut.

  As described above, by configuring the front end portion of the apron brace 16 with the crushable member 22, the crushable member 22 is crushed and a part of the collision energy can be absorbed when the collision body collides. Further, when the main body of the apron brace 16 is not damaged during a light collision or the like, the repairability of the vehicle can be improved because it is only necessary to replace the crushable member 22. The apron brace 16 may be continuously formed up to the front end without providing the crushable member 22.

  Here, the front end 16 </ b> A of the apron brace 16, that is, the front end of the crushable member 22 is disposed on the vehicle front side from the front side member 12. In other words, the apron brace 16 is formed so as to protrude from the front side member 12 toward the front side of the vehicle, and a rear end portion of a crash box 28 described later and a front end portion of the apron brace 16 are laterally viewed in the vehicle width direction. It is arranged to overlap.

  On the other hand, between the apron brace 16 and the front side member 12, polygonal gussets 18 are provided in two upper and lower stages in plan view. Note that the gusset arranged on the lower stage side has the same configuration as that obtained by vertically inverting the gusset 18 arranged on the upper stage side, so that the description of the gusset arranged on the lower stage side is omitted. Moreover, it is good also as a structure which provided the gusset 18 only in one step.

  The gusset 18 is formed in a substantially flat plate shape by bending a sheet metal, and the end portion on the inner side in the vehicle width direction of the gusset 18 is on the lower surface of the extending portion that extends outward in the vehicle width direction from the front side member 12. They are overlapped and joined together by spot welding or the like. Further, a flange 18A bent upward in the vehicle is formed at the end of the gusset 18 on the outer side in the vehicle width direction, and the flange 18A and the upper flange 16B of the apron brace 16 are coupled to each other by spot welding or the like. Yes. In this way, the front side member 12 and the apron brace 16 are connected in the vehicle width direction by the gusset 18.

  Further, a front flange 18C bent upward of the vehicle is formed at the front end 18B of the gusset 18, and the front flange 18C and the bracket 20 are fastened and connected by bolts and weld nuts. In addition, you may join by methods, such as not only this but spot welding.

  Here, a step 20A is formed at the boundary between the front side member 12 and the gusset 18 in the bracket 20, and the bracket 20 has a first surface 20B on the inner side in the vehicle width direction from the step 20A and the step 20A. And a second surface 20C on the outer side in the vehicle width direction. Further, the first surface 20B and the second surface 20C are respectively provided along the vehicle width direction, and the second surface 20C is located on the vehicle rear side from the first surface 20B. Therefore, the front end 18B of the gusset 18 coupled to the second surface 20C of the bracket 20 is disposed on the vehicle rear side from the front end 12A of the front side member 12 and the front end 16A of the apron brace 16.

  A crash box 28 is provided on the front side of the front side member 12 and the gusset 18 with the bracket 20 interposed therebetween. The crash box 28 has a substantially rectangular tube shape elongated in the vehicle front-rear direction, and a plurality of ridge lines R are formed along the vehicle front-rear direction. The crush box 28 has a plurality of concave beads 28A and concave beads 28B formed so as to straddle the ridgeline R.

  A flange 28 </ b> C is provided integrally with the crash box 28 at the rear end portion of the crash box 28. The flange 28 </ b> C and the bracket 20 are fastened and coupled to the front flange 12 </ b> B of the front side member 12 and the flange 28 </ b> C of the gusset 18 in a state of being fastened together by bolts and weld nuts.

  A bumper reinforcement 30 is coupled to the front end of the crash box 28 along the vehicle width direction. The bumper reinforcement 30 is elongated in the vehicle width direction, and spans the front end portions of the left and right crash boxes 28.

  Further, a power unit P that is a driving source of the vehicle is disposed between the front side members 12. The power unit P is directly or indirectly supported by components such as the front side member 12 and a suspension member (not shown). In the present embodiment, as an example, the power unit P extends from the front side member 12 inward in the vehicle width direction. The power unit P is supported by the support member 32. The support member 32 is fixed to the front side member 12 by a bracket 34.

(Action and effect)
Next, the operation and effect of the vehicle front structure 10 of the present embodiment will be described. In the following description, an operation in the case where an offset frontal collision in which a colliding body collides with the left side, which is mainly one side in the vehicle width direction, in the vehicle to which the vehicle front structure 10 having the above-described configuration is applied will be described. explain. As such an offset frontal collision, a minute lap collision can be mentioned. The minute lap collision here refers to, for example, a collision to the outside in the vehicle width direction with respect to the front side member which is a vehicle body skeleton among the frontal collisions of the vehicle.

  As shown in FIG. 2, when a micro lap collision occurs, first, a rearward collision load (F) is applied from the barrier B as the collision body to the outer side portion of the front side member 12 in the bumper reinforcement 30 in the vehicle width direction. Entered. When the collision load (F0) is transmitted from the bumper reinforcement 30 to the crash box 28, the crash box 28 is compressed in the front-rear direction. As a result, part of the collision energy input to the vehicle is absorbed.

  Subsequently, the barrier B comes into contact with the apron brace 16 disposed on the vehicle front side from the front side member 12. In the present embodiment, the barrier B comes into contact with the crushable member 22 constituting the front end portion of the apron brace 16, and the collision load (F1) is transmitted to the apron brace 16. Thus, since the barrier B comes into contact with the apron brace 16 before the front side member 12 and the gusset 18, the apron brace 16 bends the apron brace 16 inwardly in the vehicle width direction (so-called inner protrusion). Moment M1 acts. Then, as shown in FIG. 3, the apron brace 16 is bent inward in the vehicle width direction, and a part of the energy at the time of the collision is absorbed. At this time, the crushable member 22 may be crushed so that a part of the energy at the time of collision can be absorbed.

  As described above, the apron brace 16 is bent inward in the vehicle width direction, so that a force directed toward the vehicle width direction outer side is applied to the front side member 12 via the gusset 18. As shown in FIG. 4, when the crash box 28 is completely crushed and a collision load (F 2) is transmitted from the barrier B to the front side member 12, the front side member 12 is inserted into the front side member 12. A moment M2 for breaking is applied.

  At this time, the apron brace 16 has already been folded inward, and does not stretch. That is, when the apron brace 16 is stretched without breaking when the front side member 12 is deformed, a moment opposite to the desired moment may act on the front side member 12. This worry does not occur because 16 is bent in early. As a result, the deformation of the front side member 12 is not suppressed, the desired moment M2 can be applied to the front side member 12, and the deformation mode of the front side member 12 can be stabilized.

  Further, since the front end 18B of the gusset 18 is located on the vehicle rear side from the front end 12A of the front side member 12, the front end 18B of the gusset 18 and the front end 12A of the front side member 12 are arranged at the same position in the vehicle front-rear direction. Compared with the case, the load in the shearing direction that acts on the gusset 18 from the barrier B is reduced, and the gusset 18 and the front side member 12 can be prevented from peeling off.

  Then, when a desired moment M2 is applied to the front side member 12, the front side member 12 is deformed and presses the power unit P toward the anti-collision side (the vehicle right side). In this way, a lateral force inward in the vehicle width direction can be generated, and the vehicle can be moved away from the barrier B.

  Next, the deformation state at the time of oblique collision will be considered. As shown in FIG. 5, at the time of the oblique collision, an oblique collision load (F3) directed backward and inward from the barrier B as the collision body is input to the bumper reinforcement 30. When the collision load is transmitted from the bumper reinforcement 30 to the crash box 28, the crash box 28 is compressed in the front-rear direction.

  Here, in particular, at the time of oblique collision, the crash stroke of the crash box 28 located on the outer side in the vehicle width direction is shortened, so the front end 12A of the front side member 12 and the front end 18B of the gusset 18 are arranged at the same position in the vehicle front-rear direction. In such a case, there is a possibility that a sufficient crash stroke cannot be secured.

  On the other hand, in the case of the vehicle including the vehicle front portion structure 10 according to the present embodiment, the front end 18B of the gusset 18 is located on the vehicle rear side by the distance X from the front end 12A of the front side member 12. The length of the crash box 28 can be increased by the length. That is, the crash stroke can be lengthened.

  As described above, in the vehicle front structure 10 according to the present embodiment, more crash energy can be absorbed by the crash box 28, so that damage to the vehicle can be reduced. For this reason, at the time of the light collision of a vehicle, damage to a skeleton part can be avoided and repair property can be improved. Moreover, it is possible to reduce the harmfulness to the opponent vehicle.

  The vehicle front structure 10 according to the embodiment of the present invention has been described above, but it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.

10 vehicle front structure 12 front side member 12A front end (front end of front side member)
14 Apron upper member 16 Apron brace (extension part)
16A front end (front end of extension)
18 gusset 18B front end (front end of gusset)

Claims (1)

A front side member provided at the front of the vehicle and extending in the vehicle longitudinal direction;
An apron upper member provided on the vehicle width direction outer side and the vehicle upper side of the front side member and extending in the vehicle front-rear direction;
An extension that extends from the apron upper member to the front side of the vehicle and has a front end disposed on the front side of the vehicle from the front side member;
It is provided between the front side member and the extension part, connects the front side member and the extension part in the vehicle width direction, and has a front end behind the front end of the front side member and a front end of the extension part. A gusset placed on the side,
A vehicle front structure having:

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