JP6292088B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure.

  Patent Document 1 below discloses a vehicle front portion structure that can absorb an impact at the time of a vehicle frontal collision. Specifically, a frame extending in the vehicle front-rear direction, a crash box provided at the front end of the frame in the vehicle front-rear direction, a bumper reinforcement attached to the vehicle front-rear direction front of the crash box, and a crash box And a bumper support provided at a joint portion between the bumper reinforcement and the bumper reinforcement. With this configuration, in the event of a frontal collision of the vehicle, the crash box is compressed in the vehicle front-rear direction via the bumper support, so that the shock absorption is stably absorbed.

JP 2009-101731 A

  However, according to the configuration disclosed in Patent Document 1, the bumper support may be displaced in a direction other than the vehicle front-rear direction depending on the method of coupling the bumper support and the frame (crash box). There is room for improvement in terms of improving the transmission performance of transmitting to the frame.

  In view of the above problems, an object of the present invention is to obtain a vehicle front structure that can improve load transmission performance for transmitting a collision load at the time of a vehicle front collision to a frame.

The vehicle front structure according to the first aspect of the present invention includes a frame extending in the vehicle front-rear direction and a first contact provided at a front end of the frame in the vehicle front-rear direction in a posture orthogonal to the longitudinal direction of the frame. a contact portion, a bumper support attached to said front end of said frame, said with attached to the front end side of the frame in the bumper support, the first contact portion and the facing and the first contact portion And a second abutting portion disposed at a position spaced apart in the vehicle longitudinal direction, and at least the second abutting portion is located outside the side surface of the frame in a state of abutting against the first abutting portion. And a patch configured to include a claw portion that abuts against the side surface of the frame when the bumper support is displaced in the vehicle width direction with respect to the frame.

  According to the first aspect of the present invention, at the time of a vehicle front collision, the bumper support is displaced rearward in the vehicle front-rear direction by a collision load input to the bumper support attached to the front end portion of the frame. Therefore, the second contact portion of the bumper support patch contacts the first contact portion attached to the front end portion of the frame. Thereby, the collision load input to the bumper support can be effectively transmitted to the frame.

  In addition, when a collision load is input to the bumper support, the bumper support may be displaced rearward in the vehicle longitudinal direction and in the vehicle width direction with respect to the frame depending on the input direction of the collision load and the method of coupling the bumper support and the frame. There is. As a result, the collision load may not be stably transmitted to the frame. However, in the present invention, when the bumper support is displaced rearward in the vehicle longitudinal direction and in the vehicle width direction with respect to the frame, the claw portion positioned outside the side surface of the frame comes into contact with the side surface of the frame along with the displacement of the bumper support. This suppresses further displacement of the bumper support. Therefore, since the collision load input to the bumper support is transmitted in the vehicle longitudinal direction, the collision load can be stably transmitted to the frame extended in the vehicle longitudinal direction.

  The vehicle front structure according to the first aspect of the present invention has an excellent effect that the collision load at the time of the vehicle collision can be sufficiently transmitted to the frame.

It is a top view which shows the vehicle front part in the vehicle which has the vehicle front part structure which concerns on one Embodiment. 1 is a perspective view showing a bumper support and a frame in a vehicle having a vehicle front structure according to an embodiment. (A) is a top view which shows the bumper support in the vehicle which has the vehicle front part structure which concerns on one Embodiment, (B) is the state which looked at the bumper support shown by (A) from the vehicle rear to the vehicle front. It is a perspective view shown. (A) is sectional drawing which shows the initial state of the bumper support and flame | frame in the vehicle which has the vehicle front part structure which concerns on one Embodiment, (B) is a cross section which shows the initial state at the time of a vehicle front collision with respect to (A). It is a figure and (C) is a sectional view showing the latter state at the time of vehicles front side collision to (B). (A) is sectional drawing which shows the initial state of the bumper support and flame | frame in the vehicle which has the vehicle front part structure which concerns in contrast, (B) is sectional drawing which shows the initial state of a vehicle front collision with respect to (A). FIG. 6C is a cross-sectional view showing a later stage state at the time of the vehicle front collision with respect to FIG.

  Hereinafter, an embodiment of a vehicle front structure according to the present invention will be described with reference to FIGS. In these drawings, the arrow UP indicates the vehicle vertical direction upper side, the arrow FR indicates the vehicle front-rear direction front side, and the arrow OUT indicates the vehicle width direction outer side.

  As shown in FIG. 1, a front bumper 12 is provided at the front portion of the vehicle 10. The front bumper 12 is disposed so as to extend in the vehicle width direction, and is made of resin as an example. On the back side of the front bumper 12, bumper supports 14 are attached at two locations apart in the vehicle width direction (only one location is shown in FIG. 1). The bumper support 14 is attached to a front end portion 18 of the frame 16 that is formed in a long shape. In addition, since each bumper support 14 provided in two places on the back side of the front bumper 12 has a left-right symmetrical structure, only one bumper support 14 will be illustrated and described below.

  As shown in FIG. 2, the frame 16 is provided on a pair of frame side surfaces 20 provided in the vehicle width direction, a frame upper surface portion 22 provided on the vehicle vertical direction upper side, and a vehicle vertical direction lower side. And a frame lower surface portion 24. The frame 16 is formed in a hollow rectangular tube shape in which the cross-sectional shape orthogonal to the longitudinal direction is a substantially rectangular shape by the frame side surface portion 20, the frame upper surface portion 22, and the frame lower surface portion 24. The frame 16 is arranged so that the longitudinal direction of the substantially rectangular cross section is substantially the vehicle vertical direction, and the axial direction of the square tube is the vehicle longitudinal direction. Further, the frame 16 is formed with a shaft compression portion 26. In the shaft compression portion 26, recesses 32 are formed in the vehicle upper ridge line 28 and the vehicle lower ridge line 30 in the frame 16. Furthermore, between the recesses 32 formed in the vehicle upper ridge line 28 and the vehicle lower ridge line 30, a lightening hole 34 penetrating in the plate thickness direction of the frame side surface portion 20 is formed. Thereby, when a collision load is applied in the axial direction of the frame 16, compressive stress is concentrated on the periphery of the recess 32 and the lightening hole 34, and the axial compression part 26 is compressed and deformed in the axial direction of the frame 16. The impact load can be absorbed.

  A bulkhead 36 is attached to the front end 18 of the frame 16 on the front side in the vehicle longitudinal direction. The bulkhead 36 includes a front side wall portion 38 provided on the front side in the vehicle front-rear direction and a rear side wall portion 40 provided on the rear side in the vehicle front-rear direction of the front side wall portion 38.

  As shown in FIG. 4A, the front side wall portion 38 has a substantially U-shaped cross-sectional shape that is orthogonal to the vehicle vertical direction with the opening directed outward in the vehicle width direction. Specifically, the vehicle front side contact part 42 as a first contact part provided on the front side in the vehicle front-rear direction along the vehicle vertical direction of the frame 16 and the vehicle width direction inner end of the vehicle front side contact part 42 A vehicle width inner side portion 44 extending from the rear portion in the vehicle front-rear direction, a vehicle rear side portion 46 extending from the vehicle front-rear direction rear end portion of the vehicle width inner portion 44 to the vehicle width direction outer side, It is made up to include. The rear side wall portion 40 is coupled to the vehicle width inner side portion 44 of the front side wall portion 38, and the cross sectional shape orthogonal to the vehicle vertical direction is substantially J-shaped with the cross section opening directed outward in the vehicle width direction. Yes. The bulkhead 36 is disposed at a position where a bolt 50 (to be described later) is accommodated inside the cross section of the front side wall portion 38 in the front end portion 18.

  As shown in FIG. 3A, the bumper support 14 includes a front bracket 52 extending in the front side of the vehicle and in the vehicle front-rear direction, and a rear side in the vehicle front-rear direction of the front bracket 52 and outward in the vehicle width direction. And a rear bracket 54.

  As shown in FIG. 3B, the front bracket 52 includes a first bracket 56 disposed on the outer side in the vehicle width direction and a second bracket 58 disposed on the inner side in the vehicle width direction of the first bracket 56. It is configured to include. The first bracket 56 has a substantially U-shaped cross section orthogonal to the vehicle front-rear direction with the opening directed inward in the vehicle width direction. Specifically, a first bracket upper portion 60 that extends along the vehicle front-rear direction is provided on the upper side in the vehicle vertical direction, and the vehicle bracket vertical outer end of the first bracket upper portion 60 The 1st bracket side part 62 extended to is provided. A first bracket bottom 64 extending inward in the vehicle width direction is provided at the lower end of the first bracket side 62 in the vehicle vertical direction. Further, a bolt fastening hole 66 penetrating in the plate thickness direction is formed on the rear side in the vehicle front-rear direction of the first bracket upper portion 60 and the first bracket bottom portion 64.

  The second bracket 58 has a substantially U-shaped cross section orthogonal to the vehicle front-rear direction with the opening directed outward in the vehicle width direction. Specifically, a second bracket upper portion 68 that extends substantially along the vehicle width direction is provided on the upper side in the vehicle vertical direction, and the end of the second bracket upper portion 68 on the inner side in the vehicle width direction has a lower vehicle vertical direction. A second bracket side portion 70 extending to the side is provided. A second bracket bottom portion 72 extending outward in the vehicle width direction is provided at the lower end of the second bracket side portion 70 in the vehicle vertical direction.

  The first bracket 56 and the second bracket 58 are arranged so that the openings having the cross-sectional shapes face each other. The vehicle lower side surface of the first bracket upper portion 60 and the vehicle upper side surface of the second bracket upper portion 68 are in contact with each other, and the vehicle upper side surface of the first bracket bottom portion 64 and the vehicle lower side surface of the second bracket bottom portion 72 are in contact with each other. It is arc welded to abut. As a result, the connecting portion between the first bracket 56 and the second bracket 58 has a substantially rectangular cross-sectional shape perpendicular to the vehicle longitudinal direction.

  A patch 74 is provided on the rear side in the vehicle longitudinal direction of the second bracket 58. The patch 74 has a substantially rectangular shape in cross section perpendicular to the vehicle vertical direction when viewed from the rear of the vehicle. Specifically, a patch inner portion 76 extending along the vehicle vertical direction is provided on the inner side in the vehicle width direction, and the end portion on the inner side in the vehicle width direction of the patch inner portion 76 is arranged in the vehicle front-rear direction and the vehicle width direction. A claw portion 86 extending obliquely inward is provided. Further, a bulk abutting portion 78 as a second abutting portion is provided at the outer end of the patch inner portion 76 in the vehicle width direction. Furthermore, a patch outer side portion 80 is provided at an end portion of the bulk contact portion 78 on the outer side in the vehicle width direction.

  The bulk abutting portion 78 has a substantially U-shaped cross-sectional shape perpendicular to the vehicle vertical direction with the opening directed forward in the vehicle front-rear direction. That is, the bulk contact portion 78 is formed so as to protrude rearward in the vehicle front-rear direction with respect to the patch inner portion 76 and the patch outer portion 80. Further, the bulk abutting portion 78 is set to have a smaller size in the vehicle vertical direction than the patch outer side portion 80 and the patch inner side portion 76 in the vehicle front view.

  The patch inner portion 76 and the end of the second bracket side portion 70 on the rear side in the vehicle front-rear direction are joined by arc welding. Moreover, the vehicle width direction outer side edge part of the patch outer side part 80 and the vehicle width direction inner side surface of the first bracket side part 62 are joined by arc welding. Thereby, the patch 74 is coupled to the front bracket 52. Note that the patch 74 is coupled to the first bracket 56 so that the bulk contact portion 78 is positioned on the front side in the vehicle front-rear direction of the bolt fastening hole 66 in a vehicle plan view (see FIG. 3A).

  The rear bracket 54 is formed in a substantially U shape with a cross-sectional shape orthogonal to the vehicle width direction such that the opening is directed rearward in the vehicle front-rear direction. Specifically, a rear bracket upper portion 92 extending substantially in the vehicle width direction is provided on the upper side of the vehicle in the vertical direction, and at the end of the rear bracket upper portion 92 on the front side in the vehicle front-rear direction, it extends downward in the vehicle vertical direction. An extended rear bracket front portion 94 is provided. In addition, a rear bracket bottom portion 96 that extends rearward in the vehicle front-rear direction is provided at an end of the rear bracket front portion 94 on the vehicle vertical direction lower side. The rear bracket 54 and the front bracket 52 are in contact with the vehicle upper side surface of the rear bracket upper portion 92 and the vehicle lower side surface of the first bracket upper portion 60, and the vehicle lower side surface of the rear bracket bottom portion 96 and the first bracket bottom portion. Arc welding is performed so that the upper surface of the vehicle 64 comes into contact. Thereby, the front bracket 52 and the rear bracket 54 are integrally configured.

  As shown in FIG. 2, the front end portion 18 of the frame 16 is inserted between the first bracket upper portion 60 and the first bracket bottom portion 64 of the front bracket 52. At the same time, the bolt fastening hole 66 (see FIGS. 3A and 3B) provided in the first bracket 56 of the front bracket 52 and the frame upper surface portion 22 and the frame lower surface portion 24 of the frame 16 are penetrated in the plate thickness direction. The bumper support 14 is coupled to the front end portion 18 by inserting the bolt 50 into a bolt fastening hole (not shown) provided and screwing it into a nut (not shown). As shown in FIG. 4A, when the bumper support 14 is coupled to the front end portion 18, the bulk abutting portion 78 of the patch 74 is accommodated inside the rectangular tube of the frame 16 and the bulkhead 36. It is located so that it may oppose the vehicle front side contact part 42 in the front side wall part 38 of this. Accordingly, the bulk abutting portion 78 abuts on the vehicle front abutting portion 42 due to the displacement of the bumper support 14 at the time of a vehicle front collision. Further, the claw portion 86 of the patch 74 is located outside the frame side surface portion 20 of the frame 16. In other words, it is provided so as to cover the front end 18 from the front of the vehicle. Note that the claw portion 86 only needs to be positioned outside the frame side surface portion 20 when the bulk contact portion 78 contacts the vehicle front side contact portion 42 due to a front collision of the vehicle. You may arrange | position in positions other than the outer side.

  Next, the operation and effect of this embodiment will be described.

  Here, the operation and effect of the present 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. 5A, the bumper support 100 includes a front bracket 52 and a rear bracket 54. That is, the bumper support 100 is configured such that the patch 74 is not provided on the bumper support 14 in the present embodiment. The bumper support 100 is attached to the front end portion 18 of the frame 16. Specifically, the front end portion 18 is inserted between the first bracket upper portion 60 and the first bracket bottom portion 64 (see FIG. 3B) in the front bracket 52 of the bumper support 100. At the same time, a bolt fastening hole 66 provided in the first bracket 56 of the front bracket 52 and a bolt fastening hole (not shown) provided through the frame upper surface portion 22 and the frame lower surface portion 24 in the plate thickness direction. The bolt 50 is inserted through the screw 50 and screwed into a nut (not shown).

  At the time of offset collision (ODB), as shown in FIG. 5B, when a collision load is input to the bumper support 100 toward the rear side in the vehicle longitudinal direction, the bumper support 100 is displaced rearward in the vehicle longitudinal direction. However, since the bumper support 100 is fastened to the frame 16 by only one bolt 50, the bumper support 100 is displaced so as to rotate along the vehicle width direction around the bolt 50. Then, as shown in FIG. 5C, the bumper support 100 is compressed and deformed in a state of being displaced in the vehicle width direction. That is, since the bumper support 100 is displaced more in the vehicle width direction than in the vehicle front-rear direction, there is room for improvement in terms of improving load transmission performance from the bumper support 100 to the frame 16 extended in the vehicle front-rear direction.

  On the other hand, in the present embodiment, as shown in FIG. 4 (B), at the time of the front collision of the vehicle, the rear side in the vehicle front-rear direction is caused by the collision load input to the bumper support 14 attached to the front end 18 of the frame 16. Displace to Therefore, the bulk contact portion 78 in the patch 74 of the bumper support 14 and the vehicle front side contact portion 42 attached to the front end portion 18 of the frame 16 abut. Thereby, the collision load input to the bumper support 14 can be effectively transmitted to the frame 16.

  Further, when a collision load is input to the bumper support 14, the bumper support 14 is displaced in the vehicle width direction with respect to the frame 16 or the vehicle width due to the input direction of the collision load and the coupling of the bumper support 14 and the frame 16 with the bolt 50. There is a possibility that the vehicle may be displaced backward in the longitudinal direction of the vehicle while tilting in the direction. As a result, the collision load may not be stably transmitted to the frame 16. However, in this embodiment, since the bumper support 14 is provided with the claw portion 86, the bumper support 14 is displaced in the vehicle width direction or is tilted in the vehicle width direction with respect to the frame 16. When the rear side is displaced, the claw portion 86 positioned outside the frame side surface portion 20 abuts on the frame side surface portion 20 along with the displacement of the bumper support 14, thereby suppressing further displacement of the bumper support 14. Therefore, as shown in FIG. 4C, the collision load input to the bumper support 14 is transmitted substantially in the vehicle longitudinal direction, so that the frame 16 extended in the vehicle longitudinal direction has a stable posture. It can be transmitted sufficiently. For this reason, the collision load can be absorbed by the shaft compression portion 26 of the frame 16.

  Furthermore, in the present embodiment, the bumper support 14 is provided with a patch 74 having a bulk contact portion 78 and a claw portion 86. That is, it is not necessary to change the coupling method of the bumper support 14 and the frame 16 with respect to the proportionality. Therefore, by adding the patch 74 to the proportional bumper support 100 shown in FIG. 5A, which is a reinforcing member for attaching the front bumper 12 to the frame 16, it can be used as a load transmission member. Thereby, it becomes possible to sufficiently transmit the collision load at the time of the vehicle front collision to the frame 16 without greatly changing the manufacturing method or cost.

  In addition, in this embodiment, although applied to the vehicle made into what is called a frame structure which has the flame | frame 16 extended in the vehicle front-back direction, you may apply to the vehicle of not only this but a monocoque structure. That is, the present embodiment can be applied by extending the frame from the monocoque vehicle body to the rear portion of the bumper support 14.

  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.

14 Bumper support 16 Frame 18 Front end 20 Frame side (side)
42 Vehicle front side contact portion (first contact portion)
74 Patch 78 Bulk contact part (second contact part)
86 Nail

Claims (1)

A frame extending in the longitudinal direction of the vehicle;
A first contact portion provided in a posture orthogonal to the longitudinal direction of the frame at a front end portion of the frame in the vehicle longitudinal direction;
A bumper support attached to the front end of the frame;
Wherein together mounted on the front end side of the frame in the bumper support, the first contact portion and the facing and the first abutting section and the second abutting section disposed at a position spaced in the longitudinal direction of the vehicle And at least the second contact portion is positioned outside the side surface of the frame in contact with the first contact portion, and when the bumper support is displaced in the vehicle width direction with respect to the frame, A patch configured to include a claw portion that contacts the side surface;
A vehicle front structure having:

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