JP2013147189A - Vehicle body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve crashworthiness of a vehicle.SOLUTION: A vehicle body front structure 10 includes: a front cross member 18 extending in a vehicle width direction and coupling vehicle front sides to each other of a pair of front side members 14, 16 that are respectively disposed on both vehicle lateral sides so as to extend in a vehicle longitudinal direction; and a front bumper reinforcement 20 extending in a vehicle width direction, in which coupling parts 22, 24, 26 projecting toward a vehicle rear side from at least both ends in a vehicle width direction and a center part are jointed to the front cross member 18.

Description

  The present invention relates to a vehicle body front structure.

  2. Description of the Related Art Conventionally, a front body structure of an automobile in which both end portions in the vehicle width direction of a front bumper reinforcement are connected to a front side member is known (for example, see Patent Document 1).

JP-A 63-255188

  However, in the structure described in Patent Document 1, since the cooling unit exists in the vehicle width direction center portion of the front portion of the vehicle body, it is difficult to improve the collision resistance performance in the vehicle width direction center portion of the front bumper reinforcement. . As described above, there is still room for improvement in the structure for improving the anti-collision performance at the front portion of the vehicle body.

  Therefore, in view of the above circumstances, an object of the present invention is to obtain a vehicle body front part structure that can improve collision resistance.

  In order to achieve the above object, the vehicle body front structure according to claim 1 of the present invention extends in the vehicle width direction, and is a pair arranged so as to extend in the vehicle body front-rear direction on both sides of the vehicle body. A front cross member that connects the front side of the front side member of the front side member, and a connecting portion that extends in the vehicle width direction and protrudes at least from both ends and the center of the vehicle width direction toward the rear side of the vehicle body. And a front bumper reinforcement joined to the member.

  According to the first aspect of the present invention, the front bumper reinforcement is joined to the front cross member by at least connecting portions projecting from both ends and the center in the vehicle width direction toward the vehicle rear side. Therefore, not only the both ends in the vehicle width direction of the front bumper reinforcement but also the collision resistance performance in the center in the vehicle width direction can be improved. In other words, according to the present invention, the anti-collision performance at the time of frontal collision of the vehicle can be improved.

  Further, the vehicle body front part structure according to claim 2 is the vehicle body front part structure according to claim 1, wherein both end portions in the vehicle width direction of the front cross member are opposed to the front wheel in the vehicle longitudinal direction. It is characterized by that.

  According to the second aspect of the present invention, the impact at the time of a frontal collision of the vehicle can be absorbed from the front cross member by the front wheels and the rocker. Therefore, the anti-collision performance at the time of frontal collision of the vehicle can be further improved.

  Further, the vehicle body front structure according to claim 3 is the vehicle body front structure according to claim 2, wherein the front bumper reinforcement is on the vehicle body front side at both ends in the vehicle width direction of the front cross member. It has the shock-absorbing member arrange | positioned at the vehicle width direction both outer side of a ment.

  According to the third aspect of the present invention, the impact at the time of a frontal collision of the vehicle can be absorbed by the impact absorbing member. Therefore, the anti-collision performance at the time of frontal collision of the vehicle can be further improved.

  As described above, according to the present invention, the collision resistance can be improved.

It is a perspective view which shows the vehicle body front part side of a vehicle. 1 is a side sectional view showing a schematic configuration of a vehicle body front side. It is a top view which shows schematic structure of the vehicle body front part structure which concerns on this embodiment. It is a top view which shows the state of the vehicle body front part structure when a vehicle collides with a micro lap front. It is a top view which shows the state of the vehicle body front part structure when a vehicle carries out an offset frontal collision. It is a top view which shows the state of the vehicle body front part structure when a vehicle collides with a full lap front.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each drawing is an upward direction of the vehicle body, an arrow FR is a forward direction of the vehicle body, and an arrow OUT is an outer side of the vehicle width direction. Further, in the following description, when using front / rear, up / down, and left / right directions unless otherwise specified, front / rear in the front / rear direction of the vehicle body, up / down in the up / down direction of the vehicle body, and left / right in the left / right direction of the vehicle body (vehicle width direction).

  Further, as shown in FIG. 1, the vehicle 12 according to the present embodiment has a shorter length in the vehicle front-rear direction on the vehicle front side than the center of the wheel 41 of the front wheel 40 (the cooling unit shown in FIG. 2 on the vehicle body front side). 50), so-called short overhang vehicle.

  As shown in FIGS. 2 and 3, a pair of front side members 14, 16 extending in the longitudinal direction of the vehicle body are disposed on the right side of the vehicle body and the left side of the vehicle body (both sides of the vehicle body). The front side members 14 and 16, the front cross member 18 and the front bumper reinforcement 20 which will be described later are made of a metal material such as aluminum or aluminum alloy as an example so as to form a closed cross section (rectangular frame cross section) structure. It is formed into a long square pipe by extrusion.

  A front cross member 18 constituting the vehicle body front part structure 10 is installed at the front end portions of the pair of left and right front side members 14 and 16. The front cross member 18 extends in the vehicle width direction so that both ends 19 in the vehicle width direction face the front wheels 40 in the longitudinal direction of the vehicle body. Specifically, both end portions 19 in the vehicle width direction of the front cross member 18 protrude outward in the vehicle width direction from the left and right front side members 14, 16 and do not protrude outward in the vehicle width direction from the front wheels 40. It is formed in length.

  The front cross member 18 integrally connects the front end portions of the pair of left and right front side members 14 and 16. In other words, this configuration can improve the rigidity of the left and right front side members 14 and 16 and improve the steering stability of the vehicle 12.

  A front bumper reinforcement 20 constituting the vehicle body front portion structure 10 is disposed on the vehicle body front side of the front cross member 18. The front bumper reinforcement 20 is curved and extends in the vehicle width direction so that the center portion in the vehicle width direction is positioned on the front side of the vehicle body from both ends in the vehicle width direction.

  As shown in the plan view of FIG. 3, the front bumper reinforcement 20 is long enough that the rear wall surface 20B facing the rear side of the vehicle body does not protrude outward in the vehicle width direction from the left and right front side members 14 and 16. Is formed. That is, the front bumper reinforcement 20 is formed shorter than the front cross member 18. Thus, the vehicle 12 can be reduced in weight.

  Further, at least both ends and the center in the vehicle width direction of the rear wall surface 20B of the front bumper reinforcement 20 are integrally provided with connecting portions 22, 24, and 26 extending toward the rear side of the vehicle body. Yes. Each of the connecting portions 22, 24, and 26 is formed by extrusion molding of the above metal material into a short square pipe shape, and constitutes a closed section (rectangular frame section) structure alone.

  That is, the front bumper reinforcement 20 includes the connecting portions 22, 24, and 26, and is formed in a substantially “E” shape in plan view. And the vehicle body rear side edge part (end surface) of each connection part 22,24,26 is joined to the front wall surface 18A which faces the vehicle body front side of the front cross member 18, respectively, by joining means, such as welding, The front bumper reinforcement 20 is fixed to the front cross member 18.

  In addition, you may make it the structure which provides the crush box (illustration omitted) as an impact-absorbing body integrally in the axial direction in each connection part 22, 24, 26, or each connection part 22, 24, 26. You may make it comprise itself with a crash box. According to this, at the time of a frontal collision of the vehicle 12, the crash box in each of the connecting portions 22, 24, 26 is crushed (crushed) in the axial direction, so that the collision load can be absorbed and reduced.

  Also, carbon fiber, glass fiber, aramid fiber, for example, on the vehicle body front side in the vehicle width direction both ends 19 of the front cross member 18 and on both outer sides in the vehicle width direction than both ends in the vehicle width direction of the front bumper reinforcement 20 An impact absorbing member 28 that constitutes the vehicle body front structure 10 together with the front cross member 18 and the front bumper reinforcement 20 is disposed.

  Here, the front bumper reinforcement 20 is formed in such a length that the wall surface 20 </ b> B does not protrude outward in the vehicle width direction from the left and right front side members 14, 16. Therefore, the shape of the impact absorbing member 28 provided on the outer side in the vehicle width direction from both ends of the front bumper reinforcement 20 in the vehicle width direction has a degree of freedom. That is, the design can be provided with a degree of freedom in the design around the bumper including the portion where the shock absorbing member 28 is provided.

  The illustrated shock absorbing member 28 includes, as an example, a front surface 28A curved along the front wall surface 20A facing the front side of the vehicle body of the front bumper reinforcement 20 and a rear surface flattened along the front wall surface 18A of the front cross member 18. 28B and side surfaces 28C flattened along the side wall surfaces 22A and 24A facing the vehicle width direction outside of the connecting portions 22 and 24, and are formed in a substantially triangular shape in plan view.

  Further, a space formed by (enclosed with) the front cross member 18, the left and right front side members 14, 16 and a dash panel 46 (see FIG. 2) described later is an engine compartment 30, and the engine compartment A power unit 32 including an engine 34 is disposed in 30.

  A cylindrical steering gear box 36 whose longitudinal direction is the vehicle width direction is disposed on the vehicle body rear side of the power unit 32. Tie rods 38 extend from both ends in the vehicle width direction of the steering gear box 36 to both outer sides in the vehicle width direction, and front wheels 40 are connected to both outer ends in the vehicle width direction of the tie rods 38.

  As shown in FIG. 1, a rocker 42 extending in the longitudinal direction of the vehicle body is disposed on the outer side in the vehicle width direction of the left and right front side members 14 and 16 and on the vehicle body rear side of the front wheel 40. Yes. A front pillar 43 is integrally extended in the vehicle body upward direction at the vehicle body front side end portion of the rocker 42. A front bumper 44 is disposed on the front side of the vehicle body of the front bumper reinforcement 20.

  As shown in FIG. 2, a substantially flat dash panel 46 is provided on the vehicle body rear side of the power unit 32 and on the vehicle body upper side of the left and right front side members 14 and 16. The dash panels 46 are fixed to vehicle body frame members such as the rocker 42 and the front pillar 43 at both outer ends in the vehicle width direction, and the lower ends of the dash panels 46 are connected to a dash cross member 48 extending in the vehicle width direction. It is fixed.

  A cooling unit 50 is disposed below the dash panel 46 (dash cross member 48) in the vehicle body. The cooling unit 50 includes a condenser 52, a radiator 54, and a fan 56 in order from the front side of the vehicle body to the rear side of the vehicle body. The condenser 52 and the radiator 54 are front and rear in a side view of FIG. It is inclined and arranged so as to be in an inclined posture.

  In the vehicle body front structure 10 having the above-described configuration, the operation at the time of a frontal collision of the vehicle 12 will be described with reference to FIGS.

  First, the micro lap frontal collision shown in FIG. 4 will be described. When the front bumper 44 corresponding to, for example, an outer portion in the vehicle width direction of the front bumper reinforcement 20 collides with the barrier W, that is, a so-called micro lap front collision, the vehicle 12 collides with the front bumper reinforcement 20 and the front bumper reinforcement 20. The collision load is input to the connecting portion 22 at the right end via the, and the collision load is input to the shock absorbing member 28 provided on the right side portion thereof.

  Then, the collision load is absorbed by the connecting portion 22 and the shock absorbing member 28. As described above, since the shock absorbing members 28 are disposed on the vehicle body front side of the both ends 19 in the vehicle width direction of the front cross member 18 and on both outer sides in the vehicle width direction of the front bumper reinforcement 20, The collision resistance performance at the time of a collision can be improved.

  The collision load that is not completely absorbed by the connecting portion 22 and the shock absorbing member 28 is transmitted mainly to the right end 19 of the front cross member 18. The collision load transmitted to the right end 19 of the front cross member 18 is transmitted to the right front side member 14 and absorbed by the right front side member 14.

  At this time, the right front side member 14 may absorb the collision load while compressively deforming in the axial direction. The collision load transmitted to the front cross member 18 is also transmitted to the left front side member 16 and is absorbed by the left front side member 16.

  Further, the collision load is distributed and transmitted from the right end 19 of the front cross member 18 to the right front wheel 40 (and also the power unit 32), thereby absorbing the collision load. Further, since the front wheel 40 is provided with a wheel 41 that is not easily crushed, when the right front wheel 40 interferes with the rocker 42, the collision load is transmitted to the rocker 42 through the wheel 41 and absorbed. Therefore, it is possible to suppress the deformation on the front side of the vehicle body at the time of a minute lap front collision, and to minimize the reduction of the space in the passenger compartment.

  Next, the offset frontal collision shown in FIG. 5 will be described. When the front bumper 44 corresponding to, for example, the right half of the front bumper reinforcement 20 collides with the barrier W, that is, a so-called offset frontal collision, the vehicle 12 is connected to the right end via the front bumper 44 and the front bumper reinforcement 20. A collision load is input to the connection portion 22 and the central connection portion 26, and a collision load is input to the shock absorbing member 28 provided on the right side portion thereof.

  Then, the collision load is absorbed by the connecting portions 22 and 26 and the shock absorbing member 28. As described above, the front bumper reinforcement 20 is connected not only to both ends in the vehicle width direction but also to the front cross member 18 through the connecting portion 26 in the vehicle width direction central portion. The collision performance can be improved.

  The collision load that is not completely absorbed by the connecting portions 22 and 26 and the shock absorbing member 28 is transmitted mainly to the right half side of the front cross member 18. The collision load transmitted to the right half side of the front cross member 18 is transmitted to the right front side member 14, and is absorbed by the right side front side member 14 being compressed and deformed in the axial direction. The collision load transmitted to the front cross member 18 is also transmitted to the left front side member 16 and absorbed by the left front side member 16.

  Furthermore, the collision load is distributed and transmitted from the right end 19 of the front cross member 18 to the right front wheel 40, and the collision load is also distributed and transmitted from the front cross member 18 to the power unit 32. The collision load is also absorbed by them. Further, since the front wheel 40 is provided with a wheel 41 that is not easily crushed, when the right front wheel 40 interferes with the rocker 42, the collision load is transmitted to the rocker 42 through the wheel 41 and absorbed. Therefore, at the time of an offset frontal collision, deformation on the front side of the vehicle body can be suppressed, and reduction of the space in the passenger compartment can be minimized.

  Finally, the full wrap frontal collision shown in FIG. 6 will be described. When the front bumper 44 corresponding to the entire length of the front bumper reinforcement 20 collides with the barrier W, that is, when the vehicle 12 collides with a so-called full-wrap front collision, the connecting portions 22 at both left and right end portions via the front bumper 44 and the front bumper reinforcement 20. , 24 and the connecting portion 26 at the central portion, and a collision load is input to the shock absorbing members 28 provided on the left and right side portions thereof.

  Then, the collision load is absorbed by the connecting portions 22, 24, 26 and the shock absorbing member 28. As described above, the front bumper reinforcement 20 is connected not only to both ends in the vehicle width direction but also to the front cross member 18 through the connecting portion 26 in the vehicle width direction central portion. The collision performance can be improved.

  The collision load that is not completely absorbed by the connecting portions 22, 24, 26 and the shock absorbing member 28 is transmitted to the entire front cross member 18. The collision load transmitted to the entire front cross member 18 is transmitted to the left and right front side members 14 and 16, and the left and right front side members 14 and 16 are absorbed by compressing and deforming in the axial direction. .

  In other words, according to the front bumper reinforcement 20 including the respective connecting portions 22, 24, and 26 and configured in a substantially “E” shape in plan view, through the front cross member 18 at an early stage after a full-wrap frontal collision, The collision load can be distributed to the left and right front side members 14 and 16, and the collision load can be absorbed by the left and right front side members 14 and 16.

  Further, the collision load is distributed and transmitted from both ends 19 of the front cross member 18 to the front wheels 40 on both the left and right sides, and the collision load is also distributed and transmitted from the front cross member 18 to the power unit 32. Also, the collision load is absorbed by them. Further, since the front wheel 40 is provided with a wheel 41 that is not easily crushed, when the front wheels 40 on the left and right sides interfere with the rocker 42, the collision load is transmitted to the rocker 42 through the wheel 41 and absorbed. . Therefore, deformation at the front side of the vehicle body can be suppressed at the time of a full-wrap frontal collision, and reduction of the space in the passenger compartment can be minimized.

  As described above, according to the vehicle body front structure 10 according to the present embodiment, even in the case of a short overhang vehicle 12, the front side of the vehicle during a minute lap front collision, an offset front collision, and a full lap front collision. The deformation of the vehicle can be suppressed, and the space of the passenger compartment can be secured widely. Therefore, the collision safety performance for the occupant can be improved as compared with the conventional case, and the collision resistance performance of the vehicle 12 can be improved.

  Moreover, the front bumper reinforcement 20 is joined (connected) to the front cross member 18 at three points (each connecting portion 22, 24, 26) at both ends in the vehicle width direction and at the center portion, thereby causing a micro lap front collision, Since it is possible to deal with each of the offset frontal collision and the full-wrapped frontal collision, it is not necessary to add a reinforcing member or the like for dealing with each collision, and the vehicle 12 can be reduced in weight.

  The vehicle body front structure 10 according to the present embodiment has been described with reference to the drawings. However, the vehicle body front structure 10 according to the present embodiment is not limited to the illustrated one, and the gist of the present invention is described. The design can be changed as appropriate without departing from the scope. For example, the connecting portions 22, 24, and 26 may be provided so as to protrude at least at three positions, that is, at both ends in the vehicle width direction and the central portion, and more than that.

DESCRIPTION OF SYMBOLS 10 Vehicle body front part structure 12 Vehicle 14 Front side member 16 Front side member 18 Front cross member 20 Front bumper reinforcement 22 Connection part 24 Connection part 26 Connection part 28 Shock absorption member

Claims (3)

A front cross member that extends in the vehicle width direction and connects the vehicle body front sides of a pair of front side members arranged to extend in the vehicle body longitudinal direction on both sides of the vehicle body;
A front bumper reinforcement extending in the vehicle width direction and having at least a connecting portion projecting from the both ends and the center of the vehicle width direction toward the rear side of the vehicle body,
The vehicle body front part structure characterized by having.   The vehicle body front part structure according to claim 1, wherein both ends of the front cross member in the vehicle width direction are opposed to the front wheels in the vehicle longitudinal direction.   3. The vehicle body according to claim 2, further comprising an impact absorbing member disposed on a vehicle body front side at both ends in the vehicle width direction of the front cross member and on both outer sides in the vehicle width direction of the front bumper reinforcement. Front structure.

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