JP5732797B2 - Vehicle bumper - Google Patents

Description

  The present invention relates to a vehicle bumper.

  Conventionally, a vehicle bumper having a bumper absorber provided inside a bumper fascia is known. For example, there is a bumper absorber integrally formed in a U-shaped cross section by an upper leg and a lower leg extending in the front-rear direction and a bridge portion connecting the upper leg and the lower leg (for example, see Patent Document 1).

JP 2008-213577 A

  However, in the bumper absorber described in Patent Document 1, since the collision energy is absorbed mainly only by crushing the bumper absorber, in order to increase the amount of absorption, it is necessary to increase the front and rear thickness of the bumper absorber. There was a problem that the entire bumper was enlarged.

  Therefore, an object of the present invention is to provide a vehicle bumper that can reduce the thickness of the bumper absorber and reduce the size of the entire bumper.

A vehicle bumper according to the present invention is disposed at a front end or a rear end of a vehicle and extends in the vehicle width direction so as to face a front side in the front-rear direction of the bumper fascia. A vehicular bumper including an absorbable bumper absorber and a bumper reinforcement that is disposed inside the bumper absorber in the front-rear direction and supports the bumper absorber. The bumper absorber is formed in a U-shaped cross section from a vertical surface that extends in the vertical direction and the vehicle width direction, and an upper surface and a lower surface that extend inward in the front-rear direction from the upper and lower ends of the vertical surface. . The bumper fascia has at least one of an upper wall surface opposed to the upper surface of the bumper absorber and a lower wall surface disposed opposed to the lower surface of the bumper absorber, and the upper wall surface of the bumper fascia and the bumper absorber the vertical distance between the upper surface L1, and the upper and lower distance between the lower surface of the lower wall and the bumper absorber of the bumper fascia and L2, when the longitudinal length of the bumper absorber is T, to satisfy the T> L1 and T> L2 Is set to When a predetermined compressive load along the front-rear direction is input to the bumper absorber via the bumper fascia, the upper and lower surfaces of the bumper absorber are bent and deformed, so that both the upper and lower wall surfaces of the bumper fascia It is configured to be deformed by pressing in the vertical direction.

  According to the present invention, when a compressive load inward in the front-rear direction is input to the bumper absorber via the bumper fascia, the upper surface or the lower surface of the bumper absorber is bent up and down so that the upper or lower wall surface of the bumper fascia is Press up and down to deform. The deformation of the upper wall surface or the lower wall surface of the bumper fascia can efficiently absorb the compressive load. In addition, this makes it possible to reduce the size of the entire bumper. Furthermore, by appropriately changing the dimensions of T and L, the pressing force between the upper and lower wall surfaces of the bumper fascia and the upper and lower surfaces of the bumper absorber can be adjusted and set to a desired load absorption amount. Can do.

1 is a perspective view showing a vehicle front end portion according to a first embodiment of the present invention. It is an expanded sectional view by the AA line of FIG. It is a perspective view which shows the bumper fascia and bumper reinforcement by the 1st Embodiment of this invention. It is sectional drawing by the BB line of FIG. FIG. 4 is an exploded perspective view of FIG. 3. It is the top view which looked at FIG. 3 from the top. It is the front view which looked at FIG. 3 from the front. It is sectional drawing after a deformation | transformation in case the collision load is input into the bumper by 1st Embodiment. It is a load-stroke diagram in case a collision load is inputted into the bumper by a 1st embodiment. It is sectional drawing of the vehicle front-end part by the 2nd Embodiment of this invention. It is a load-stroke diagram in case a collision load is inputted into a bumper by a 2nd embodiment. It is sectional drawing of the vehicle front-end part by the 3rd Embodiment of this invention. It is sectional drawing after a deformation | transformation in case the collision load is input into the bumper by 3rd Embodiment. It is sectional drawing of the vehicle front-end part by the 4th Embodiment of this invention. It is sectional drawing after a deformation | transformation in case the collision load is input into the bumper by 4th Embodiment. It is sectional drawing of the vehicle front-end part by the 5th Embodiment of this invention. It is sectional drawing after a deformation | transformation in case the collision load is input into the bumper by 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, a front bumper is taken as an example, but the present invention can also be applied to a rear bumper.

[First embodiment]
First, the first embodiment will be described.

  As shown in FIGS. 1 and 2, a front bumper 2 extending in the vehicle width direction, an upper front grill 3 disposed above the front bumper 2, and a lower side of the front bumper 2 are disposed at the vehicle front end 1. The lower front grill 4 and an under cover 5 extending rearward from the lower end of the lower front grill 4 are provided.

  The upper front grille 3 and the lower front grille 4 are formed with a plurality of vents 6, 7, and vehicle running wind flows into the engine room via the vents 6, 7.

  As shown in FIGS. 2 to 4, the front bumper 2 includes a bumper fascia 8 disposed at the front end of the vehicle, and a bumper absorber disposed on the rear side (inward in the front-rear direction) of the bumper fascia 8 so as to face the bumper fascia 8. 9 and a bumper reinforcement 10 that is disposed on the rear side (inward in the front-rear direction) of the bumper absorber 9 and supports the bumper absorber 9. The lower front grill 4 is formed on a bumper fascia 8.

  The bumper absorber 9 has a U-shaped cross section from a vertical surface 11 extending in the vertical and vehicle width directions, and an upper surface 12 and a lower surface 13 extending inward in the front-rear direction from the upper and lower ends of the vertical surface 11. Is formed.

  The bumper fascia 8 extends vertically and vertically along the vehicle width direction, and bends and extends rearward from the upper end of the vertical wall 14, and is disposed opposite to the upper surface 12 of the bumper absorber 9. The upper wall surface 15 includes a lower wall surface 17 that is bent and extends rearward from the lower end of the vertical wall surface 14 and is disposed to face the lower surface of the bumper absorber.

  As shown in FIGS. 3 and 6, the bumper absorber 9 and the bumper fascia 8 are formed in an arc shape in plan view, and both end portions in the vehicle width direction of the bumper fascia 8 are front and rear as they go outward in the vehicle width direction. It is formed on the inclined surface 18 whose thickness is reduced.

  As shown in FIG. 4, the bumper reinforcement 10 has a vertically long rectangular cross section, and is provided with ribs 19 at upper and lower intermediate height positions. By the ribs 19, the bumper reinforcement 10 is configured in two upper and lower closed cross-sectional structures. Further, a pair of upper and lower grooves 21 and 22 are formed at the upper and lower ends of the front surface 20 of the bumper reinforcement 10, and the rear ends of the upper surface 12 and the lower surface 13 of the bumper absorber 9 are fitted. Yes. As shown in FIGS. 3, 5 to 7, four mounting pieces 23 are fixed to the upper surface 12 of the bumper absorber 9 along the vehicle width direction, and these mounting pieces 23 are connected via bolts 24. Are fastened to the upper wall 25 of the bumper reinforcement 10.

  Here, as shown in FIG. 2, the vertical distance between the upper wall surface 15 of the bumper fascia 8 and the upper surface 12 of the bumper absorber 9 is L1 (L), the lower wall surface 17 of the bumper fascia 8 and the lower surface 13 of the bumper absorber 9 Is set so that T> L1, L2 is satisfied, where L2 (L) is the vertical distance between and the bumper absorber 9 is T. Furthermore, it is preferable to set T> 2L1, 2L2 (T> 2L), that is, L1, L2 (L) to be equal to or less than ½ of T.

  When an impact load is applied to the vehicle front end 1 having the above-described configuration via the collision body C from the front, the lower surface 13 of the bumper absorber 9 is bent downward and deformed as shown in FIG. The lower wall surface 17 is deformed while pressing downward. Due to the deformation of the lower wall surface 17, the impact load can be absorbed efficiently.

  The relationship between the deformation stroke and the impact load will be described using the graph of FIG. In FIG. 9, the horizontal axis indicates the stroke in the front-rear direction of the bumper absorber 9 and the bumper fascia 8, and the vertical axis indicates the load absorbed by the bumper absorber 9 and the bumper fascia 8.

  As shown in FIG. 9, it can be seen that the load absorbed by the bumper absorber 9 and the bumper fascia 8 according to the first embodiment is larger than when the bumper absorber 9 and the bumper fascia 8 are simply combined.

  Below, the effect by this embodiment is demonstrated.

  (1) The vehicle bumper according to the present embodiment is a front bumper 2 that is disposed at the front end or rear end of the vehicle and extends in the vehicle width direction, and includes a bumper fascia 8 disposed at the vehicle front end or rear end. A bumper absorber 9 disposed on the inner side in the front-rear direction of the bumper fascia 8, and a bumper reinforcement 10 disposed on the rear side (inward in the front-rear direction) of the bumper absorber 9 to support the bumper absorber 9. The bumper absorber 9 is a cross-section from a vertical surface 11 extending in the vertical direction and the vehicle width direction, and an upper surface 12 and a lower surface 13 extending from the upper and lower ends of the vertical surface 11 to the rear side (front and rear direction inner side). The bumper fascia 8 is formed in a U-shape, and the upper wall surface 15 disposed opposite to the upper surface 12 of the bumper absorber 9 and the front It has at least one of the lower wall surface 17 arranged to face the lower surface 13 of the bumper absorber 9, and the vertical distance between the upper wall surface 15 of the bumper fascia and the upper surface 12 of the bumper absorber 9 is L1, and the lower wall surface 17 of the bumper fascia 9 And the lower and upper surfaces 13 of the bumper absorber 9 are set to L2, and the longitudinal length of the bumper absorber 9 is set to T, so that T> L1 and L2 are satisfied, and the bumper absorber 9 is moved back and forth via the bumper fascia 8. When a predetermined compressive load is input along the direction, the upper surface 12 or the lower surface 13 of the bumper absorber 9 is bent and deformed to press the upper wall surface 15 or the lower wall surface 17 of the bumper fascia 8 in the vertical direction. doing.

  Therefore, when a rearward collision load is input to the bumper absorber 9 via the bumper fascia 8, the lower surface 13 of the bumper absorber 9 is bent downward and presses the lower wall surface 17 of the bumper fascia 8 downward. Deform. By the downward deformation of the lower wall surface 17 of the bumper fascia 8, the collision load can be efficiently absorbed. In addition, the thickness of the bumper absorber 9 can thereby be reduced, the entire bumper can be reduced in size, and the cost can be reduced. Further, by appropriately changing the dimensions of the T, L1, and L2, the pressing force between the lower wall surface 17 of the bumper fascia 8 and the lower surface 13 of the bumper absorber 9 can be adjusted, and a desired load absorption amount is set. be able to.

  (2) Since T> 2L1, 2L2 (T> 2L) is set, the lower deformation of the lower wall surface 17 of the bumper fascia 8 is further increased, and the collision load is absorbed more efficiently. Is called.

[Second Embodiment]
Next, the second embodiment will be described, but the same reference numerals are given to the parts having the same structure as the first embodiment, and the description thereof will be omitted.

  In the present embodiment, as shown in FIG. 10, the vertical distance L2 between the lower surface 13 of the bumper absorber 9 and the lower wall surface 17 of the bumper fascia 8 is made smaller than in the first embodiment. Specifically, L2 was set to 5 mm.

  When a collision load is input to the front end of the vehicle via the collision body C, as shown in FIG. 11, the load absorbed by the bumper absorber 9 and the bumper fascia 8 in the first half of the collision is larger than that in the first embodiment. I understand.

[Third embodiment]
Next, a third embodiment will be described, but the same reference numerals are given to portions having the same structure as the first and second embodiments described above, and the description thereof will be omitted.

  As shown in FIG. 12, in this embodiment, T> 2L1 and 2L2 are satisfied, and L1 and L2 are set to have substantially the same dimensions.

  When a collision load is input to the front end of the vehicle via the collision body C, as shown in FIG. 13, the upper surface 12 of the bumper absorber 9 is bent upward, the lower surface 13 is bent downward, and the upper wall surface of the bumper fascia 8 15 and the lower wall surface 13 are both pressed and deformed in the vertical direction. Thereby, the collision load can be absorbed more efficiently.

[Fourth Embodiment]
Next, the fourth embodiment will be described, but the same reference numerals are given to the parts having the same structure as the first to third embodiments described above, and the description thereof will be omitted.

  In this embodiment, as shown in FIG. 14, the cross-sectional shape of the upper surface 30 of the bumper absorber 29 is bent in a U shape and is convex upward, and the cross-sectional shape of the lower surface 31 is also in a U shape. It is bent and formed convex downward. The vertical distance L2 between the lower surface 31 of the bumper absorber 29 and the lower wall surface 17 of the bumper fascia 8 is set to be ½ or less of the longitudinal length T of the bumper absorber 29.

  When a collision load is input to the front end of the vehicle via the collision body C, the lower surface 31 of the bumper absorber 29 bends downward and deforms by pressing the lower wall surface 17 of the bumper fascia 8 downward as shown in FIG. Let Thereby, a collision load can be absorbed efficiently.

[Fifth Embodiment]
Next, the fifth embodiment will be described, but the same reference numerals are given to the parts having the same structure as the first to fourth embodiments described above, and the description thereof will be omitted.

  In the present embodiment, as shown in FIG. 16, the cross-sectional shape of the upper surface 30 of the bumper absorber 29 is bent in a U shape and is convex upward, and the cross-sectional shape of the lower surface 31 is also in a U shape. It is bent and formed convex downward. The vertical distance L1 between the upper surface 30 of the bumper absorber 29 and the upper wall surface 15 of the bumper fascia 8 and the vertical distance L2 between the lower surface 31 of the bumper absorber 29 and the lower wall surface 17 of the bumper fascia 8 are the front and rear of the bumper absorber 29. It is set to 1/2 or less of the length L.

  When a collision load is input to the front end of the vehicle via the collision body C, as shown in FIG. 17, the upper surface 30 and the lower surface 31 of the bumper absorber 29 bend upward and downward, and the upper wall surface 15 of the bumper fascia 8 moves upward. The lower wall surface 17 is pressed downward and deformed. Thereby, the collision load can be absorbed more efficiently.

2 Front bumper (vehicle bumper)
8 Bumper fascia 9, 29 Bumper absorber 10 Bumper reinforcement 11 Vertical surface 12, 30 Upper surface 13, 31 Lower surface 15 Upper wall surface 17 Lower wall surface

Claims (2)

A vehicle bumper that is disposed at the front end or rear end of the vehicle and extends in the vehicle width direction,
A bumper fascia disposed at a front end or a rear end of the vehicle, a bumper absorber disposed opposite to the inner side in the front-rear direction of the bumper fascia, and a bumper reinforcement disposed on the inner side in the front-rear direction of the bumper absorber to support the bumper absorber With
The bumper absorber is formed in a U-shaped cross section from a vertical surface extending in the vertical direction and the vehicle width direction, and an upper surface and a lower surface extending inward in the front-rear direction from an upper end and a lower end of the vertical surface,
The bumper fascia has an upper wall surface disposed to face the upper surface of the bumper absorber, and a lower wall surface disposed to face the lower surface of the bumper absorber,
The vertical distance between the upper surface of the upper wall surface and the bumper absorber of the bumper fascia L1, and the upper and lower distance between the lower surface of the lower wall and the bumper absorber of the bumper fascia and L2, when the longitudinal length of the bumper absorber is T, Set to satisfy T> L1 and T> L2 ,
When a predetermined compressive load along the front-rear direction is input to the bumper absorber via the bumper fascia, the upper and lower surfaces of the bumper absorber are bent and deformed, so that both the upper and lower wall surfaces of the bumper fascia A bumper for a vehicle characterized by being configured to press against the vehicle. 2. The vehicle bumper according to claim 1, wherein the vehicle bumper is set to satisfy T> 2L1 and T> 2L2 .

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