Vehicle front structure

Abstract

To provide a vehicle front structure where impact force is surely transferred to a front side frame at the time of SOL collision.SOLUTION: A vehicle front structure 100 comprises: a front side frame 10; a bumper reinforcement 20; and a fastening plate 30 which is sandwiched and fastened between a front end 12 of the front side frame 10 and a fastening part 22 of the bumper reinforcement 20. The bumper reinforcement 20 and the fastening plate 30 are extended to the outside in a vehicle width direction relative to the front side frame 10, a tip 38 of the fastening plate 30 is fastened to an outer end 24 of the bumper reinforcement 20, and a SOL brace 40 extending in vehicle oblique rear side from the fastening plate 30 to the outside surface of the front side frame 10 in the vehicle width direction is attached to the vehicle rear side surface of the fastening plate 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle front structure, and more particularly to a mounting structure for an SOL brace. [Background technology]

[0002] An SOL brace is used to transmit the impact load during a small overlap collision (hereinafter referred to as an SOL collision) to the front side frame (see, for example, Patent Document 1). The SOL brace collides with the side surface of the front side frame during an SOL collision, transmitting the impact force to the side surface of the front side frame, causing the vehicle to shift laterally, thereby suppressing deformation at the front of the passenger compartment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-47108 Summary of the Invention [Problem to be solved by the invention]

[0004] In an SOL collision, the barrier enters the side end of the bumper reinforcement force that is on the outer side in the vehicle width direction than the front side frame. Therefore, the side end of the bumper reinforcement force may be subjected to a shear force in the vehicle longitudinal direction by the barrier and the front end of the front side frame, and may break. When the break occurs, the side end of the bumper reinforcement force moves toward the rear of the vehicle together with the barrier. In the conventional vehicle front structure, the SOL brace is attached to the side end, so in the event of an SOL collision, the SOL brace may also move toward the rear of the vehicle together with the side end. For this reason, in the conventional vehicle front structure, the impact force cannot be transmitted to the side of the front side frame in the event of an SOL collision, and it may be difficult to suppress deformation in the front of the vehicle compartment.

[0005] Therefore, an object of the present disclosure is to reliably transmit the impact force to the front side frame during an SOL collision. [Means for solving the problem]

[0006] The vehicle front structure of the present disclosure is a vehicle front structure comprising: a front side frame arranged on the front side of the vehicle and extending in the fore-and-aft direction of the vehicle; a bumper reinforcement force fastened to the front end of the front side frame and extending in the vehicle width direction; and a fastening plate sandwiched between the front end of the front side frame and the fastening portion of the bumper reinforcement force and fastened to the front end of the front side frame and the fastening portion of the bumper reinforcement force, wherein the bumper reinforcement force and the fastening plate extend outward in the vehicle width direction than the front side frame, a tip end of the fastening plate is fastened to the vehicle width outer end of the bumper reinforcement force, and an SOL brace is attached to the vehicle rear surface of the fastening plate, extending from the fastening plate toward the vehicle width outer surface of the front side frame and diagonally rearward of the vehicle.

[0007] Since the SOL brace is attached to a fastening plate rather than directly to the bumper reinforcement, the relative position to the front side frame is maintained even if the bumper reinforcement breaks during an SOL collision. This makes it possible to transmit the collision load from the barrier to the side of the front side frame, suppressing deformation of the front of the passenger compartment by shifting the vehicle sideways during an SOL collision.

[0008] In the vehicle front structure of the present disclosure, the outer portion of the fastening plate extending outward in the vehicle width direction further outward than the front side frame may be bent in a convex mountain shape toward the rear of the vehicle so that a gap is created between the outer portion and the rear surface of the bumper reinforcement.

[0009] As a result, during SOL, the bumper reinforcement force is crushed into the gap between the vehicle front surface of the fastening plate and the barrier to absorb the impact force, thereby increasing the amount of impact energy absorbed.

[0010] In the vehicle front structure of the present disclosure, the SOL brace may be welded to a rear surface of the fastening plate that is on the outer side in the vehicle width direction than a ridge line of the fastening plate that protrudes toward the rear of the vehicle.

[0011] In this way, because the SOL brace is welded to the rear surface of the fastening plate, there are no parts of the fastening plate that protrude from the front of the vehicle, and in the event of an SOL collision, the bumper reinforcement force ensures a sufficient gap between the front surface of the fastening plate and the barrier, allowing more of the impact force to be absorbed. Effect of the Invention

[0012] The present disclosure can reliably transmit impact force to the front side frame during an SOL collision. [Brief description of the drawings]

[0013] [Figure 1] 1 is an exploded perspective view showing a vehicle front structure according to an embodiment of the present invention; [Diagram 2] 1 is a plan view showing a vehicle front structure according to an embodiment. [Diagram 3] 1 is a plan view showing deformation of each portion at the initial stage of a collision when a vehicle equipped with the vehicle front structure of the embodiment experiences an SOL collision. [Figure 4] 1 is a plan view showing deformation of each portion after a collision when a vehicle equipped with the vehicle front structure of the embodiment experiences an SOL collision. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the vehicle front structure 100 of the embodiment will be described with reference to the drawings. Note that FR, UP, and RH shown in each drawing respectively indicate the front side, upper side, and right side of a vehicle 200 equipped with the vehicle front structure 100. Also, the opposite directions of FR, UP, and RH indicate the rear side, lower side, and left side. Hereinafter, when the directions of front-rear, left-right, and up-down are simply used for the description, they refer to front-rear in the front-rear direction, left-right in the left-right direction, and up-down in the up-down direction of the vehicle 200, unless otherwise specified.

[0015] 1, the vehicle front structure 100 includes a front side frame 10, a bumper reinforcement 20, a fastening plate 30, and an SOL brace 40. In the following description, the vehicle front structure 100 on the left side of the vehicle 200 will be described, but the vehicle front structure on the right side of the vehicle 200 (not shown) is symmetrical to the vehicle front structure 100 on the left side of the vehicle, so a description thereof will be omitted.

[0016] The front side frame 10 is a framework member disposed on the front left side of the vehicle 200 and extending in the vehicle longitudinal direction. The front side frame 10 includes a main body 11 and a front end plate 13. The main body 11 is a longitudinal member having a rectangular closed cross section and extending in the vehicle longitudinal direction. An opening 15 is provided on the outer surface of the main body 11 in the vehicle width direction. A bulk 16 is attached inside the opening 15. The bulk 16 is a reinforcing member that receives an impact load from a rear part 42 of an SOL brace 40, which will be described later, in the event of an SOL collision.

[0017] The front end plate 13 is a plate member attached to the front end 12 of the main body 11, and is composed of a flat plate 13A and an upper flange 13B. The flat plate 13A is a plate member with an outer dimension larger than the cross section of the main body 11, and protrudes to the left and right and below the main body 11 to form a vertical flange portion 13C extending to the left and right and downward. The upper flange 13B is a plate member extending from the upper end of the flat plate 13A toward the front of the vehicle. A plurality of bolt holes 14A are provided in the lower portion of the vertical flange portion 13C, and a plurality of bolt holes 14B are provided in the upper flange 13B.

[0018] The bumper reinforcement member 20 is a frame member that is fastened to the front end plate 13 of the front side frame 10 and extends in the vehicle width direction. The bumper reinforcement member 20 has a rectangular closed cross section and connects the front end plates 13 of the left and right front side frames 10 in the vehicle width direction. The bumper reinforcement member 20 includes a central portion 21 in the center of the vehicle width direction, a fastening portion 22 to which the front end plate 13 of the front side frame 10 is fastened, and a side end portion 23 that extends outward in the vehicle width direction from the fastening portion 22. The outer end of the side end portion 23 in the vehicle width direction is the outer end 24. The rear surface 22A and the upper surface 22B of the fastening portion 22 are provided with bolt holes 25A and 25B, respectively. In addition, a bolt hole 26B is provided in the upper surface 24B of the outer end 24, and a bolt hole 26A is provided in the rear surface 24A of the outer end 24.

[0019] The fastening plate 30 is a plate member that is sandwiched between the front end plate 13 of the front side frame 10 and the fastening portion 22 of the bumper reinforcement member 20 and fastened to the front end plate 13 of the front side frame 10 and the fastening portion 22 of the bumper reinforcement member 20.

[0020] The fastening plate 30 includes a base portion 31 and a folded plate portion 32. The base portion 31 is a plate member that is sandwiched between the front end plate 13 and the rear surface 22A of the fastening portion 22. An upper flange 34, which is a plate member that extends toward the front of the vehicle, is provided at the upper end of the base portion 31. A plurality of bolt holes 35B are provided in the upper flange 34. In addition, a plurality of bolt holes 35A are provided in the lower portion of the base portion 31.

[0021] The folded plate portion 32 is an outer portion extending from the base portion 31 to the outside in the vehicle width direction. The folded plate portion 32 is bent in a mountain shape at a ridge line 33 so as to be convex toward the rear of the vehicle. The outer end of the folded plate portion 32 in the vehicle width direction is a tip portion 38. An upper flange 36, which is a plate member extending toward the front of the vehicle, is provided at the upper end of the folded plate portion 32. The upper flange 36 is connected to the upper flange 34 of the base portion 31. A bolt hole 37B is provided at the outer end of the upper flange 36 in the vehicle width direction. A bolt hole 37A is provided at the lower part of the tip portion 38.

[0022] The front portion 41 of the SOL brace 40 is attached by welding to the rear surface of the vehicle, outside the ridge line 33 of the fastening plate 30 in the vehicle width direction. Therefore, there are no protrusions such as bolts on the front side of the folded plate portion 32 of the fastening plate 30. The SOL brace 40 is a tapered rectangular closed cross-section member whose cross-section becomes narrower toward the rear portion 42.

[0023] Next, the assembly of the front side frame 10, the bumper reinforcement member 20, and the fastening plate 30 will be described. As shown by the arrow in FIG. 1, the upper flange 34 of the fastening plate 30 is overlapped on the upper surface 22B of the fastening portion 22 of the bumper reinforcement member 20. Also, the upper flange 36 of the fastening plate 30 is overlapped on the upper surface 24B of the outer end 24. Also, the base portion 31 of the fastening plate 30 is overlapped on the rear surface 22A of the fastening portion 22, and the tip portion 38 of the fastening plate 30 is overlapped on the rear surface 24A of the outer end 24. Then, the upper flange 13B of the front end plate 13 of the front side frame 10 is overlapped on the upper flange 34 of the fastening plate 30, and the flat plate 13A of the front end plate 13 is overlapped on the surface of the base portion 31 of the fastening plate 30 on the rear of the vehicle.

[0024] The bolt hole 14B provided in the upper flange 13B of the front end plate 13, the bolt hole 35B provided in the upper flange 34 of the fastening plate 30, and the bolt hole 25B provided in the upper surface 22B of the fastening portion 22 overlap to form a through hole. Similarly, the bolt hole 14A provided in the vertical flange portion 13C of the front end plate 13, the bolt hole 35A provided in the lower part of the base portion 31, and the bolt hole 25A provided in the rear surface 22A of the fastening portion 22 overlap to form a through hole. In addition, the bolt hole 37B provided in the upper flange 36 of the fastening plate 30 overlaps with the bolt hole 26B provided in the upper surface 24B of the outer end 24 to form a through hole. Furthermore, the bolt hole 37A provided in the tip portion 38 of the fastening plate 30 overlaps with the bolt hole 26A provided in the rear surface 24A of the outer end 24 to form a through hole.

[0025] Then, as shown in FIG. 2, the upper flanges 13B and 34 are fastened to the upper surface 22B of the fastening portion 22 by passing the bolts 51 through the bolt holes 14B, 35B, and 25B. Similarly, the upper flange 36 is fastened to the upper surface 24B of the outer end 24 by passing the bolts 52 through the bolt holes 37B and 26B. Also, the bolts 54 are passed through the bolt holes 25A, 35A, and 14A, and the nuts 53 are fastened from the rear of the vehicle. As a result, the flat plate 13A and the base portion 31 are fastened to the rear surface 22A of the fastening portion 22. Also, the bolts 55 are passed through the bolt holes 26A and 37A, and the nuts 56 are fastened from the rear of the vehicle. As a result, the tip portion 38 of the fastening plate 30 is fastened to the outer end 24. In this way, the fastening plate 30 is sandwiched between the front end 12 of the front side frame 10 and the fastening portion 22 of the bumper reinforcement 20 and fastened to the front end 12 and the fastening portion 22. In addition, the tip portion 38 of the fastening plate 30 is fastened to the outer end 24 of the bumper reinforcement member 20 .

[0026] 2, when the fastening plate 30 is sandwiched and fastened between the front side frame 10 and the bumper reinforcement member 20, the bumper reinforcement member 20 and the fastening plate 30 extend outward in the vehicle width direction beyond the front side frame 10. A gap S is provided between the folded plate portion 32 of the fastening plate 30 and the rear surface 23A of the side end portion 23. The rear portion 42 of the SOL brace 40 extends obliquely rearward from the fastening plate 30 toward the outer surface of the front side frame 10 in the vehicle width direction.

[0027] Next, deformation of each part when a vehicle 200 equipped with the vehicle front structure 100 undergoes an SOL collision will be described with reference to Figures 2 to 4. In an SOL collision, as shown in Figure 2, the barrier 90 enters the side end 23 of the bumper reinforcement 20 that is on the outer side in the vehicle width direction than the front side frame 10.

[0028] As shown in Fig. 2, a gap S is provided between the folded plate portion 32 of the fastening plate 30 and the rear surface 23A of the side end portion 23. Therefore, when the barrier 90 collides in front of the side end portion 23 of the bumper reinforcement force 20 in an SOL manner, as shown in Fig. 3, the side end portion 23 is crushed in the front-to-rear direction of the vehicle in the gap S between the front surface of the fastening plate 30 and the barrier 90. This crushing of the bumper reinforcement force 20 absorbs the impact force.

[0029] In addition, the side end 23 receives a shear force in the vehicle longitudinal direction from the barrier 90 and the front end 12 of the front side frame 10. As a result, the side end 23 breaks into a portion 23C adjacent to the fastening portion 22 and a portion 23D including the outer end 24. At this time, the fastening plate 30 bends at the folded plate portion 32 toward the rear of the vehicle but does not break. Since the SOL brace 40 is welded and fixed to the fastening plate 30, even if the side end 23 of the bumper reinforcement 20 breaks, the rear portion 42 maintains a state of extending from the fastening plate 30 toward the outer surface of the front side frame 10 in the vehicle width direction diagonally rearward of the vehicle.

[0030] 4, when the barrier 90 further advances, the rear portion 42 of the SOL brace 40 enters the opening 15 of the front side frame 10 and abuts against the bulk 16 arranged therein. As a result, a force toward the right of the vehicle 200 is input from the SOL brace 40 to the front side frame 10. As a result, the vehicle 200 shifts laterally to the right, and the barrier 90 passes over the left side of the vehicle 200. This makes it possible to prevent the barrier 90 from entering the vehicle compartment and deforming the front of the vehicle compartment.

[0031] In this manner, in the vehicle front structure 100, since the SOL brace 40 is attached to the fastening plate 30, even if the bumper reinforcement 20 breaks during an SOL collision, the fastening plate 30 maintains the relative position with respect to the front side frame 10. This enables the transmission of collision load from the barrier 90 to the side surface of the front side frame 10. Then, during an SOL collision, the vehicle 200 is shifted laterally, suppressing deformation of the front of the passenger compartment.

[0032] In addition, in the vehicle front structure 100, the bumper reinforcement force 20 is crushed in the gap S between the vehicle front surface of the fastening plate 30 and the barrier 90 during an SOL collision to absorb the impact force, so the amount of impact energy absorbed can be increased. Furthermore, since the SOL brace 40 is welded to the vehicle rear surface of the fastening plate 30, there is no member of the fastening plate 30 that protrudes toward the vehicle front, and the gap S between the vehicle front surface of the fastening plate 30 and the barrier 90 can be sufficiently secured. As a result, the amount by which the bumper reinforcement force 20 is crushed between the vehicle front surface of the fastening plate 30 and the barrier 90 during an SOL collision increases, and more impact force can be absorbed.

[0033] In the above description, the fastening plate 30 is composed of the base portion 31 and the folded plate portion 32 that is convex in a mountain shape, but is not limited thereto. For example, the fastening plate 30 may be composed of the base portion 31 and a flat plate-shaped leading plate portion that extends from the base portion 31 toward the outer end 24 of the bumper reinforcement member 20. In this case, the width of the gap S is narrowed, so that the amount of impact force absorbed is less than that of the vehicle front structure 100 described above, but as with the vehicle front structure 100, the collision load can be transmitted from the barrier 90 to the side surface of the front side frame 10 during an SOL collision, and deformation of the front of the vehicle compartment can be suppressed. [Explanation of symbols]

[0034] 10 front side frame, 11 main body, 12 front end, 13 front end plate, 13A flat plate, 13B, 34, 36 upper flange, 13C vertical flange portion, 14A, 14B, 25A, 25B, 26A, 26B, 35A, 35B, 37A, 37B bolt hole, 15 opening, 16 bulk, 20 bumper reinforcement, 21 center portion, 22 fastening portion, 22A, 23A, 24A rear surface, 22B, 24B upper surface, 23 side end portion, 23C, 23D portion, 24 outer end portion, 31 base portion, 32 folded plate portion, 33 ridge line, 38 tip portion, 40 SOL brace, 41 front portion, 42 rear portion, 51, 52, 54, 55 bolt, 53, 56 nut, 90 Barrier, 100 vehicle front structure, 200 vehicle, S gap.

Claims

1. a front side frame disposed on a side portion at the front of the vehicle and extending in a front-rear direction of the vehicle; A bumper reinforcement member fastened to a front end of the front side frame and extending in a vehicle width direction; A vehicle front structure including: a fastening plate sandwiched between the front end of the front side frame and a fastening portion of the bumper reinforcement and fastened to the front end of the front side frame and the fastening portion of the bumper reinforcement, The bumper reinforcement member and the fastening plate extend outward in the vehicle width direction from the front side frame, and a tip portion of the fastening plate is fastened to an outer end of the bumper reinforcement member in the vehicle width direction, An SOL brace is attached to a vehicle rear surface of the fastening plate, the SOL brace extending from the fastening plate toward an outer surface of the front side frame in the vehicle width direction obliquely toward the rear of the vehicle. A vehicle front structure characterized by the above.

2. 2. The vehicle front structure according to claim 1, an outer portion of the fastening plate extending outward in the vehicle width direction from the front side frame is bent in a convex mountain shape toward the rear of the vehicle so as to provide a gap between the outer portion and a rear surface of the bumper reinforcement; A vehicle front structure characterized by the above.

3. 3. The vehicle front structure according to claim 2, The SOL brace is welded to a rear surface of the fastening plate that is on the outer side in the vehicle width direction than a rearward protruding ridge line of the fastening plate. A vehicle front structure characterized by the above.

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