JP2015048001A - Car body front part structure - Google Patents

Abstract

A vehicle body front structure in which an outrigger of a host vehicle is difficult to deform a skeleton member of a side portion of a counterpart vehicle inward in the vehicle width direction. An outrigger, which is a skeleton member that projects substantially horizontally outward in the vehicle width direction, is joined to the outer surface in the vehicle width direction near the front end of the front side frame. The outrigger 18 is formed with higher rigidity than the outer wall 13a of the front side frame 13 in the vehicle width direction. When an impact load is input to the outrigger 18 from the skeleton member 35 on the side of the opponent vehicle, the outrigger 18 falls rearward while deforming the outer wall 13a of the front side frame 13 in the vehicle width direction. The skeleton member 35 on the side of the opponent vehicle slides on the outer side surface of the front side frame 13 of the host vehicle in the vehicle width direction. [Selection] Figure 5

Description

  The present invention relates to a vehicle body front structure in which a skeleton member protruding substantially horizontally outward in the vehicle width direction is provided in the vicinity of the front end of a front side frame extending in the vehicle body longitudinal direction.

  As the vehicle body front structure, an upper member connected to the front pillar on the rear end side is arranged outside the front side frame extending in the vehicle front-rear direction, and the front side frame and the vicinity of the front end of the upper member However, there is known one connected by an outrigger (frame member) that projects substantially horizontally from the front side frame to the outside in the vehicle width direction (see Patent Document 1).

Japanese Patent No. 3599327

  However, in the above-described conventional vehicle body front structure, the outrigger is configured to protrude substantially horizontally from the front side frame outward in the vehicle width direction, so that the host vehicle and the counterpart vehicle are largely offset in the vehicle width direction. In the case of contact between the front surfaces or in a slightly tilted state, there may be a situation in which the outrigger of the own vehicle applies a large load to the outer side surface of the skeleton member such as the front side frame or the front pillar of the opponent vehicle . In particular, when the opponent vehicle is a vehicle smaller than the own vehicle, the load transmitted through the outrigger tends to act as a force that deforms the relatively upper skeleton member such as the front pillar inward in the vehicle width direction.

  Therefore, the present invention is intended to provide a vehicle body front structure in which the outrigger of the host vehicle is difficult to deform the skeleton member on the side of the opponent vehicle inward in the vehicle width direction.

The vehicle body front structure according to the present invention employs the following configuration in order to solve the above problems.
The invention according to claim 1 projects substantially horizontally outward in the vehicle width direction on the outer wall in the vehicle width direction in the vicinity of the front end of the front side frame (for example, the front side frame 13 of the embodiment) extending in the longitudinal direction of the vehicle body. In a vehicle body front structure in which an outrigger (for example, the outrigger 18 of the embodiment) that is a skeleton member is joined, the outrigger is formed with higher rigidity than the outer wall of the front side frame. Is.
In the case of this invention, the own vehicle and the partner vehicle are largely offset in the vehicle width direction and contact each other in front of each other or in a slightly inclined state, and the front side of the outrigger of the subject vehicle is a skeleton member on the side of the partner vehicle. When the load is received from the vehicle, the outrigger collapses rearward while deforming the outer wall of the front side frame of the host vehicle without causing major deformation or deformation. At this time, the outrigger deforms the outer wall in the vehicle width direction of the front side frame of the host vehicle in a cross-sectional inward direction of the front side frame by a bending moment so as to be embedded in the front side frame. The energy of the impact load input from the partner vehicle to the outrigger is absorbed at this time, and the skeleton member on the side of the partner vehicle does not receive a large load from the outrigger of the host vehicle in the vehicle width direction of the front side frame of the host vehicle. Sliding on the outside surface.

According to a second aspect of the present invention, in the vehicle body front portion structure according to the first aspect, the upper member (for example, the first upper member 16 of the embodiment, and the upper member extending forward from the front pillar (for example, the front pillar 15 of the embodiment), and , A second upper member 17) is provided, and an end portion of the outrigger protruding in a substantially horizontal direction is joined to a front portion of the upper member, and the outrigger is formed with higher rigidity than a front portion of the upper member. It is characterized by this.
In this case, the host vehicle and the partner vehicle are largely offset in the vehicle width direction and come into contact with each other in front of each other or in a slightly inclined state, and the front part of the upper member of the host vehicle and the outrigger are the skeleton of the side part of the partner vehicle. When a load is received from the member, the front section of the upper member is collapsed and deformed, and the outrigger is collapsed and deformed so as to be embedded in the front side frame. As a result, the skeleton member on the side of the opponent vehicle slides on the outer side surface of the front side frame of the host vehicle in the vehicle width direction.

The invention according to claim 3 is the vehicle body front part structure according to claim 1 or 2, wherein the outrigger is joined to the outer side wall of the front side frame on the front end side and the rear end side, and the outrigger The front side frame and the front side frame have a bonding strength higher than that of the rear side edge.
In this case, when the outrigger of the host vehicle receives a load from the skeleton member on the side of the opponent vehicle and the outrigger falls to the rear side and deforms, the outrigger does not peel from the outer wall in the vehicle width direction of the front side frame, It will be embedded in the front side frame.

According to a fourth aspect of the present invention, in the vehicle body front portion structure according to any one of the first to third aspects, the outrigger has a cylindrical shape.
In this case, the outrigger has a simple structure, but the cross-sectional deformation is less likely to occur. Further, since the outer surface of the outrigger has a circular shape, a member that comes into contact with the outer surface of the outrigger when it falls down can be smoothly slipped.

According to a fifth aspect of the present invention, in the vehicle body front part structure according to any one of the first to fourth aspects, the outrigger is formed in a cylindrical shape and has a partition member (for example, the partition member 20 of the embodiment) inside. ) Are arranged.
In this case, even if the outrigger has a polygonal cross section such as a rectangular cross section, it is possible to make it difficult for the cross section to be crushed.

The invention according to claim 6 is the vehicle body front portion structure according to any one of claims 1 to 5, wherein the outrigger is formed of a high-strength steel plate.
In this case, it is possible to make the outrigger lightweight and to prevent the cross section from being crushed and deformed.

The invention according to claim 7 is the vehicle body front part structure according to any one of claims 1 to 6, wherein the front end portion side of the outrigger is bolted to the outer wall of the front side frame. It is a feature.
In this case, the front end portion of the outrigger is unlikely to peel off from the outer wall in the vehicle width direction of the front side frame.

The invention according to claim 8 is the vehicle body front part structure according to any one of claims 1 to 6, wherein the outrigger is abutted against the outer side wall of the front side frame, and the entire periphery is welded. It is characterized by this.
In this case, the outrigger is unlikely to peel off from the outer wall of the front side frame in the vehicle width direction.

  According to this invention, the outrigger is formed with higher rigidity than the outer wall of the front side frame in the vehicle width direction, and when the outrigger of the host vehicle receives a load from the skeleton member on the side of the opponent vehicle, Since the outrigger is configured to collapse so as to be embedded in the front side frame, it is difficult to generate a load that deforms the skeleton member on the side portion of the opponent vehicle inward in the vehicle width direction.

1 is a perspective view of a skeleton part of a vehicle according to a first embodiment of the present invention. It is a side view of the frame of the vehicle of a 1st embodiment of this invention. FIG. 3 is a top view of the vehicle for explaining the operation of the first embodiment of the present invention. It is a horizontal sectional view of the skeleton part of vehicles of a 1st embodiment of this invention. It is a horizontal sectional view showing the deformation behavior of the skeleton part of vehicles of a 1st embodiment of this invention. It is a horizontal sectional view showing the deformation behavior of the skeleton part of vehicles of a 1st embodiment of this invention. It is sectional drawing of the outrigger of 2nd Embodiment of this invention. It is sectional drawing of the outrigger of 3rd Embodiment of this invention. It is sectional drawing of the outrigger of 4th Embodiment of this invention. It is a perspective view of the principal part of the frame | skeleton part of the vehicle of 5th Embodiment of this invention. It is a perspective view of the principal part of the frame | skeleton part of the vehicle of 6th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 6 will be described. In the drawings, the arrow FR indicates the front of the vehicle.
1 and 2 are views showing a skeleton portion on the front side of a vehicle 1 according to this embodiment, and FIG. 3 shows a vehicle 1 according to this embodiment and a counterpart vehicle 2 that is smaller than the vehicle 1. It is the figure which looked at from the upper side. The vehicle 1 according to this embodiment is a large vehicle having a vehicle height higher than that of a general vehicle such as an SUV (sports utility vehicle) or an RV vehicle (leisure vehicle).

  The vehicle 1 includes a pair of left and right front side frames 13 (only one is shown in FIGS. 1 and 2) that extends from the lower region of the dash panel 12 that separates the vehicle compartment 10 and the engine compartment 11 toward the front side of the vehicle body. The front side frame 13 is formed in a rectangular closed cross-sectional shape. Bumper beams 14 are mounted around the front end portions of the left and right front side frames 13. A first upper member 16 that protrudes from the position higher than the front side frame 13 to the front side of the vehicle body is attached to the front pillar 15 that constitutes the front part of the left and right door frame parts. A front end portion of the first upper member 16 is coupled to a second upper member 17 that extends to substantially the same front position as the front end portion of the front side frame 13. In the figure, Wf is the front wheel of the vehicle.

  A bulkhead lower member 30 extending in the vehicle width direction is disposed below the front end position of the engine room 11, and a bulkhead upper member 31 is disposed above the front end position of the engine room 11. Has been placed. The bulkhead upper member 31 and the bulkhead lower member 30 are connected to each other by a side down member 32 at each position adjacent to the left and right front side frames 13 in the vehicle width direction.

  The second upper member 17 includes an inclined portion 17A that extends obliquely downward at the front portion from the joint portion with the first upper member 16, a downward extending portion 17B that extends by bending downward from the front end portion of the inclined portion 17A, It has. The second upper member 17 is formed in a cross-sectional hat shape from the inclined portion 17A to the lower end of the downward extending portion 17B. The lower edge of the downward extending portion 17B is connected to the lower side surface of the side down member 32 via a lower member 33 having a U-shaped cross section extending in the vehicle width direction.

  Outriggers 18, which are skeleton members extending substantially horizontally outward in the vehicle width direction, project from the outer walls 13 a in the vehicle width direction near the front ends of the left and right front side frames 13. The portion is welded and fixed to the upper side surface of the downwardly extending portion 17B of the second upper member 17.

FIG. 4 is a diagram illustrating a horizontal cross section of the skeleton portion on the right side of the front portion of the vehicle 1 including the outrigger 18.
As shown in the figure, the outrigger 18 of this embodiment is formed of a metal cylindrical member having a rectangular cross section, and is joined to a joint flange 18a, which is bent outwardly at a base end portion and a distal end portion in the extending direction. 18b is extended. These joint flanges 18a and 18b are coupled to the outer wall 13a in the vehicle width direction of the front side frame 13 and the inner wall (reference numeral omitted) in the vehicle width direction of the downward extending portion 17B, respectively, by spot welding or the like. . In addition, as for the joining strength with respect to the outer side wall 13a of the front side frame 13 of the outrigger 18, it is desirable to make the joining strength of the front end part side of the outrigger 18 higher than the joining strength of the rear end part side.

Here, the rigidity in the cross-sectional direction of the outrigger 18 of this embodiment is formed so as to be higher than the outer wall 13a of the front side frame 13 in the vehicle width direction. Therefore, when an impact load is input to the front side region of the outrigger 18 from the front side, the outer wall 13a in the vehicle width direction of the front side frame 13 is deformed before the outrigger 18 is crushed and deformed.
Further, the rigidity of the outrigger 18 in the cross-sectional direction is formed to be higher than the cross-sectional rigidity of the front upper end of the second upper member 17. Therefore, when an impact load is input from the front side into a region extending between the front upper end of the second upper member 17 and the outrigger 18, the front upper end side of the second upper member 17 is crushed and deformed before the outrigger 18 is crushed and deformed. To do.

  5 and 6, as shown in FIG. 3, when the host vehicle (vehicle 1) and the partner vehicle 2 are largely offset in the vehicle width direction and contacted with each other in the front or in a slightly tilted state. It is a figure which shows the deformation | transformation behavior of the frame | skeleton part of the front part side of the own vehicle. Hereinafter, the deformation behavior at the time of contact between the own vehicle and the opponent vehicle 2 will be described with reference to these drawings. In the drawings, reference numeral 35 denotes a skeleton member on the side of the vehicle body such as a front side frame or a front pillar of the counterpart vehicle 2.

  As shown in FIGS. 4 and 5, an impact load is input from the front side through the skeleton member 35 on the side portion of the counterpart vehicle 2 to the region straddling the front portion of the second upper member 17 on the left and right sides of the host vehicle and the outrigger 18. Then, the cross section of the front portion of the second upper member 17 having a lower cross-sectional rigidity than the outrigger 18 is deformed, and the outrigger 18 deforms the outer side wall 13a of the front side frame 13 having a lower rigidity than the outrigger 18. , Fall down to the rear side of the car body and deform. At this time, the outrigger 18 is acted on by a bending moment starting from a joint portion on the front side with the front side frame 13 as indicated by an arrow in FIG. 5, and the outer wall 13a of the front side frame 13 In response to the bending moment, the front side frame 13 is gradually deformed into a concave shape in the cross-sectional inward direction. The energy of the impact load input from the counterpart vehicle 2 to the second upper member 17 and the outrigger 18 is absorbed along with the deformation of the second upper member 17 and the outer wall 13a at this time.

  Then, when the mutual approach of the host vehicle (vehicle 1) and the partner vehicle 2 further proceeds, the outrigger 18 and a part of the second upper member 17 are embedded in the cross section of the front side frame 13 as shown in FIG. The outer wall 13a of the front side frame 13 is deformed. As a result, the outrigger 18 does not protrude from the general portion of the outer side wall 13a of the front side frame 13 or the amount of protrusion decreases, and the skeleton member 35 of the opponent vehicle 2 smoothly moves on the outer surface of the front side frame 13. It begins to slide.

  As described above, in the vehicle body front portion structure of this embodiment, the outrigger 18 is formed with higher rigidity than the outer side wall 13a of the front side frame 13 in the vehicle width direction. When the load is received from 35, the outrigger 18 is tilted and deformed so as to be embedded in the front side frame 13, and the skeleton member 35 on the side of the counterpart vehicle 2 can be prevented from being deformed inward in the vehicle width direction.

  Further, in the vehicle body front portion structure of this embodiment, the outrigger 18 is formed with higher rigidity than the front portion of the second upper member 17, so that the opponent vehicle 2 is located in the front side region of the outrigger 18 and the second upper member 17. When an impact load is input from the side skeleton member 35, the second upper member 17 is first crushed and deformed, and the outrigger 18 can be collapsed and deformed so as to be embedded in the front side frame 13. That is, the second upper member 17 is unlikely to hinder the deformation of the outrigger 18 and the outer wall 13a of the front side frame 13.

  Further, in this vehicle body front structure, when the joint strength on the front end side of the outrigger 18 to the outer wall 13a of the front side frame 13 is set higher than the joint strength on the rear end side, the outrigger 18 of the host vehicle It is possible to effectively suppress the outrigger 18 from being peeled off from the outer wall 13 a of the front side frame 13 when an impact load is input from the side frame member 35 of the opponent vehicle 2. Therefore, the outrigger 18 can be efficiently deformed so as to be embedded in the front side frame 13.

FIG. 7 is a view showing a cross section when the outrigger 118 of the second embodiment is cut in a direction perpendicular to the longitudinal direction. The vehicle body front structure of this embodiment is different from that of the first embodiment only in the shape of the outrigger 118.
The outrigger 118 of this embodiment is formed in a cylindrical shape with a perfect cross section by a metal material.

The vehicle body front structure of this embodiment can basically obtain the same operations and effects as those of the first embodiment. However, since the outrigger 118 has a cylindrical shape, the outrigger is simple in structure. The collapse of the cross section of 118 can be made less likely to occur.
Further, since the outrigger 118 has a cylindrical shape, when the outrigger 118 receives a load from the skeleton member on the side of the opponent vehicle and the outrigger 118 falls down and deforms, the member that comes into contact with the outer surface becomes smooth and easy to slide. There are advantages. Therefore, this reduces the load received by the skeleton member of the counterpart vehicle, and makes it difficult for the skeleton member of the counterpart vehicle to be deformed more inward in the vehicle width direction.

FIG. 8 is a view showing a cross section when the outrigger 218 of the third embodiment is cut in a direction orthogonal to the longitudinal direction. The vehicle body front structure of this embodiment is different from that of the first embodiment only in the structure of the outrigger 218.
The outrigger 218 of this embodiment is formed of a metal material into a rectangular tube shape having a rectangular cross section, and a rectangular partition wall member 20 for reinforcing the cross section is attached to the inside of the cross section.

  The vehicle body front part structure of this embodiment can obtain the same operations and effects as those of the first embodiment. However, since the partition wall member 20 is attached to the inside of the outrigger 218, the outrigger 218 is Even a non-circular cross-sectional shape can effectively prevent the cross-sectional deformation of the outrigger 218.

FIG. 9 is a view showing a cross section when the outrigger 318 of the fourth embodiment is cut in a direction perpendicular to the longitudinal direction. Also in the case of the vehicle body front structure of this embodiment, only the structure of the outrigger 318 is different from that of the first embodiment.
The outrigger 318 of this embodiment is formed in a rectangular tube shape having a rectangular cross section as in the first embodiment, but is entirely formed of a high strength steel plate.

  The vehicle body front structure of this embodiment can obtain the same operation and effect as the first embodiment, and since the entire outrigger 318 is formed of a high-strength steel plate, the weight of the outrigger 318 can be reduced. A sufficient cross-sectional strength of the outrigger 318 can be obtained while being planned.

FIG. 10 is a diagram illustrating a coupling portion between the outrigger 418 and the front side frame 13 according to the fifth embodiment. The vehicle body front part structure of this embodiment is different from that of the first embodiment only in the coupling manner of the outrigger 418 and the front side frame 13, and the other structure is the same.
The outrigger 418 is formed of a metal material in the shape of a rectangular tube with a rectangular cross section, and outward joint flanges 418a, 418b, 418c, and 418d extend on the front and rear, and the upper and lower sides of the end facing the front side frame 13, respectively. Has been. Of these, only the front-side joining flange 418a is fastened and fixed to the outer wall 13a of the front side frame 13 by bolts 21 passing through the outer wall 13a and nuts (not shown), and the other joining flanges 418b, 418c, 418d are It is fixed to the outer wall 13a of the front side frame 13 by spot welding.

  The vehicle body front part structure of this embodiment can obtain the same operations and effects as those of the first embodiment, and only the joint flange 418a on the front end side of the joint part of the outrigger 418 with the front side frame 13 is provided. However, since the bolt 21 and the nut are coupled with higher joint strength than the other joint flanges 418b, 418c, 418d, an impact load is input to the outrigger 418 of the own vehicle from the skeleton member on the side of the counterpart vehicle. When it is done, it can suppress effectively that the outrigger 418 peels from the outer side wall 13a of the front side frame 13. FIG.

FIG. 11 is a diagram illustrating a coupling portion between the outrigger 518 and the front side frame 13 according to the sixth embodiment. The vehicle body front part structure of this embodiment is different from that of the first embodiment only in the coupling manner of the outrigger 518 and the front side frame 13, and the other structure is the same.
The outrigger 518 is formed of a metal material in a rectangular tube shape having a rectangular cross section, and its four sides are abutted against the surface of the outer wall 13a of the front side frame 13, and the entire circumference is welded.

  The vehicle body front structure of this embodiment can obtain the same operation and effect as the first embodiment, and the end of the outrigger 518 is linearly welded to the outer wall 13a of the front side frame 13. Therefore, there is an advantage that the outrigger 518 is not easily peeled off from the outer wall 13a of the front side frame 13 when an impact load is input to the outrigger 518 of the own vehicle from the side frame member of the opponent vehicle.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

13 ... Front side frame 13a ... Outer wall 15 ... Front pillar 16 ... First upper member (upper member)
17 ... Second upper member (upper member)
18, 118, 218, 318, 418, 518 ... outrigger 20 ... partition member

Claims (8)

In the vehicle body front structure in which an outrigger, which is a skeleton member that protrudes substantially horizontally outward in the vehicle width direction, is joined to an outer wall in the vehicle width direction near the front end of the front side frame extending in the vehicle body longitudinal direction,
The vehicle body front structure, wherein the outrigger is formed with higher rigidity than the outer wall of the front side frame. An upper member extending forward from the front pillar is provided,
The end portion of the outrigger protruding in a substantially horizontal direction is joined to the front portion of the upper member, and the outrigger is formed with higher rigidity than the front portion of the upper member. Car body front structure. The outrigger is joined to the outer side wall of the front side frame on the front end side and the rear end side,
The vehicle body front part structure according to claim 1 or 2, wherein a joint strength of the outrigger on the front end side with the front side frame is set to be higher than a joint on the rear end side. .   The vehicle body front part structure according to any one of claims 1 to 3, wherein the outrigger has a cylindrical shape.   The vehicle body front part structure according to any one of claims 1 to 4, wherein the outrigger is formed in a cylindrical shape and a partition member is disposed therein.   The vehicle body front part structure according to any one of claims 1 to 5, wherein the outrigger is formed of a high-strength steel plate.   The vehicle body front portion structure according to any one of claims 1 to 6, wherein a front end portion side of the outrigger is bolted to the outer side wall of the front side frame.   The vehicle body front part structure according to any one of claims 1 to 6, wherein the outrigger is abutted against the outer side wall of the front side frame and welded all around.

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