WO2009107670A1 - バンパビーム - Google Patents
バンパビーム Download PDFInfo
- Publication number
- WO2009107670A1 WO2009107670A1 PCT/JP2009/053423 JP2009053423W WO2009107670A1 WO 2009107670 A1 WO2009107670 A1 WO 2009107670A1 JP 2009053423 W JP2009053423 W JP 2009053423W WO 2009107670 A1 WO2009107670 A1 WO 2009107670A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wall
- reinforcing plate
- bumper beam
- bumper
- beam body
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/023—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/04—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects formed from more than one section in a side-by-side arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
- B60R2019/1806—Structural beams therefor, e.g. shock-absorbing
- B60R2019/1813—Structural beams therefor, e.g. shock-absorbing made of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
- B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
Definitions
- the present invention relates to a bumper beam attached to the body of an automobile.
- the main role of the bumper beam for automobiles is (i) that it deforms and absorbs impact energy by itself when it collides with the collision target, and (ii) impacts on the left and right side members of the vehicle body during collision.
- the bumper beam protects the occupant from the impact by causing the side member to absorb the impact energy, thereby suppressing the deformation of the cabin of the automobile as designed.
- Patent Document 1 discloses an automobile bumper support including a reinforcement having a B-shaped cross section having an upper cylindrical portion and a lower cylindrical portion, and a foam material filled in each cylindrical portion. It is disclosed. In this support body, weight reduction and prevention of buckling of the reinforcement are achieved by filling the foam material.
- a bumper main beam having an upper wall, an upper intermediate piece, a lower wall and a lower intermediate piece constituting a B-shaped cross section, the upper wall and the lower intermediate piece are inclined downward.
- the lower wall and the upper intermediate piece are disclosed to be inclined upward.
- Patent Document 3 discloses a back beam of a bumper for an automobile, which includes two hollow members, a plurality of brackets interconnected so that these hollow members form a B-shaped cross section, and a connection between the hollow members.
- a part including a reinforcing member that locally reinforces a relatively weak central part is disclosed.
- Patent Document 4 discloses a bumper reinforcement for an automobile including a web having a hollow rectangular cross section, a compression flange, and a tension flange.
- the overall bending strength is increased by setting the thickness of the portion of the web closer to the compression flange than the neutral axis to be larger than the thickness of the tension flange.
- Patent Document 5 discloses bumper reinforcement having three ribs.
- the thickness of the intermediate rib is set to be greater than the thickness of the other ribs, thereby preventing the energy absorption capability from being lowered when the three ribs are buckled.
- Patent Document 6 discloses a structural member having a pair of flanges arranged in parallel to each other.
- the FRP material is provided on the surface of the flange that is pulled when receiving a bending load among the two flanges (the flange disposed on the opposite side to the flange on the compressed side), and
- the ratio of the width and thickness of the flange on the compressed side is 12 or less, which increases the energy absorption amount of the structural member.
- Patent Document 7 discloses a composite structural member including a steel pipe and a reinforcing pipe inserted into the steel pipe.
- the reinforcing pipe has an outer shape along the inner wall of the steel pipe, and a rib is formed inside the reinforcing pipe. Thereby, sufficient strength is obtained.
- Patent Document 8 discloses a filling structure including a hollow member and a filler inserted into the hollow member.
- the filler is excellent in energy absorption performance and is fixed inside the hollow member. In this filled structure, good corrosion resistance is ensured.
- Patent Document 9 discloses a vehicle body structural member composed of a plurality of members having different strengths. In this vehicle body structural member, a difference is given to the strength of each member, which generates a torsional moment in the vehicle body structural member and distributes the bending load to other members. Therefore, the energy absorption efficiency of the vehicle body structural member is improved.
- Patent Document 10 discloses a bumper beam provided with a bumper reinforcing material.
- the bumper reinforcing material has a hollow portion, and a crushing deformation preventing body is disposed in the hollow portion. This crushing deformation prevention body suppresses the buckling deformation of the bumper reinforcing material and enhances the ability to absorb impact energy.
- the conventional structural members described above have the following problems when used as bumper beams.
- an automobile bumper beam When a pole-like object collides at high speeds before and after the vehicle body, a high bending strength is required for an automobile bumper beam. In other words, an automobile bumper beam is required to transmit a load to a side member without being greatly deformed even when it collides with a pole-like object.
- the buckling load of the web is proportional to the Young's modulus of the material and the cube of the plate thickness.
- the increase in the plate thickness is accompanied by a significant increase in the weight of the entire bumper beam.
- a steel automobile bumper beam manufactured by roll-form molding has a uniform thickness of the entire bumper beam, so that an increase in the thickness of the web increases the weight of the entire beam in proportion to this. Therefore, a significant improvement in durability performance (with respect to buckling) per unit weight cannot be expected.
- weight reduction of the entire vehicle is required to reduce CO 2 emissions.
- An object of the present invention is to provide a bumper beam capable of minimizing an increase in weight and improving bending strength.
- the bumper beam according to the first aspect of the present invention is attached to the front part or the rear part of the vehicle body and extends along a reference line, which is made of a metal plate and extends along the reference line.
- a first reinforcing plate made of metal that extends along the reference line and is attached to the beam body. Then, in at least one cross section perpendicular to the reference line, the first reinforcing plate extends linearly, and the beam body bulges from the first reinforcing plate in a direction intersecting with the inner space. A pair of bulges.
- the beam body and the first reinforcing plate satisfy the following conditions. (E st / ⁇ st 3 ) ⁇ (E 2 / ⁇ 2 3 ) E st : Young's modulus of the beam body ⁇ st : Density of the beam body E 2 : Young's modulus of the first reinforcing plate ⁇ 2 : Density of the first reinforcing plate
- the bumper beam according to the second aspect of the present invention is attached to the front part or the rear part of the vehicle body and extends along a reference line, which is made of a metal plate and extends along the reference line.
- the beam body includes a reference wall extending linearly, and a pair of bulge portions that bulge from the reference wall in a direction intersecting the reference wall while surrounding an internal space. And each bulging portion intersects the first reinforcing plate at a position closer to the other bulging portion than the outer wall portion, and an outer wall portion extending in a direction intersecting the reference wall. And an outer wall portion and an inner wall portion that are arranged side by side along the reference wall.
- the second reinforcing plate is attached to at least one of the outer wall portions and the inner wall portions in a posture parallel to the second reinforcing plate.
- the beam body and the second reinforcing plate satisfy the following conditions. (E st / ⁇ st 3 ) ⁇ (E 2 / ⁇ 2 3 ) E st : Young's modulus of the beam body ⁇ st : Density of the beam body E 3 : Young's modulus of the second reinforcing plate ⁇ 3 : Density of the second reinforcing plate
- FIG. 23 is a cross-sectional view of the bumper beam according to the first embodiment of the present invention, showing a cross section taken along line II of FIG. It is sectional drawing of the bumper beam which concerns on 2nd Embodiment of this invention. It is a graph showing the simulation result of the maximum bending moment by a three-point bending analysis. It is sectional drawing of the bumper beam which concerns on 3rd Embodiment of this invention. It is sectional drawing of the bumper beam which concerns on 4th Embodiment of this invention. It is sectional drawing of the bumper beam which concerns on 5th Embodiment of this invention. It is a graph showing the simulation result of the maximum bending moment by a three-point bending analysis.
- FIG. 1 is a cross-sectional view of a bumper beam 1 according to a first embodiment of the present invention.
- FIG. 22 is a perspective view of the beam body according to the first embodiment. 1 is at least one section of the bumper beam 1 (at least one of the sections perpendicular to the reference line W), and FIG. 1 shows a section taken along the line II in FIG. .
- the bumper beam 1 has a B-shaped cross section, and includes a beam body 2 made of a steel plate material and a reinforcing plate 3 made of an aluminum-based material (aluminum or aluminum alloy).
- the beam body 2 extends along a reference line W indicated by a broken line, and has a curved bow shape in a top view.
- the direction of the reference line W substantially coincides with the width direction C (left-right direction; see arrow C direction in the figure). More specifically, the reference line W is curved with respect to the width direction.
- FIG. 1 shows a cross section perpendicular to the reference line W, it can be said that this cross section is substantially perpendicular to the width direction C.
- the reinforcing plate 3 corresponds to the first reinforcing plate according to the present invention, and is disposed along the beam body 2. Similar to the beam body 2, the reinforcing plate 3 also has a bow-like shape curved in top view.
- a bumper assembly is formed by attaching a bumper cover (not shown) made of synthetic resin to the bumper beam 1 so as to cover the bumper beam 1.
- the bumper beam 1 is attached to the front part of the vehicle body.
- the beam body 2 is attached by welding to a side member S (FIG. 22) which is a beam member extending in the front-rear direction of the vehicle body at left and right positions of the vehicle body.
- the front side in the longitudinal direction B (see arrow B in the figure) of the vehicle body is the B2 side
- the rear side is the B1 side
- the B2 side corresponds to the side (vehicle body side) approaching the vehicle body along the front-rear direction B
- the B1 side corresponds to the side away from the vehicle body along the front-back direction B.
- the upper side in the vertical direction A of the vehicle body is the A1 side
- the lower side is the A2 side.
- the “collision direction” in the following description is the direction indicated by the arrow D in FIG.
- the collision direction D in the following description is a direction that coincides with the front-rear direction.
- the beam body 2 is made of a plate material, and is formed so that a cross section perpendicular to the reference line W is B-shaped. Specifically, the beam body 2 includes a first wall (center flange) 2j, a second wall (inner web) 2k, a third wall (rear flange) 2m, a fourth wall (outer web) 2a, and a fifth wall. (Inner web) 2e, 6th wall (rear flange) 2d, 7th wall (outer web) 2c, and 8th wall (front flange; reference wall) 2b. Extend along.
- the first wall 2j is located at the center in the vertical direction A and extends along the vertical direction A.
- the second wall 2k extends from the upper end of the first wall 2j to the B2 side (to the side closer to the vehicle body) along the front-rear direction B orthogonal thereto.
- the third wall 2m extends upward along the vertical direction A from the end of the second wall 2k on the vehicle body side (B2 side).
- the fourth wall 2a extends from the upper end of the third wall 2m along the front-rear direction B to the B1 side (to the side away from the vehicle body).
- the fifth wall 2e extends from the lower end of the first wall 2j to the B2 side along the front-rear direction B.
- the sixth wall 2d extends downward from the end of the fifth wall 2e on the vehicle body side.
- the seventh wall 2c extends from the lower end of the sixth wall 2d along the front-rear direction B to the B1 side.
- the eighth wall 2b extends along the vertical direction A, and connects the end of the fourth wall 2a on the B1 side and the end of the seventh wall 2c on the B1 side.
- each wall part which comprises the beam main body 2 is extended along the reference line W (refer FIG. 22).
- the first wall 2j, the third wall 2m, the sixth wall 2d, and the eighth wall 2b are orthogonal to the front-rear direction B, and the second wall 2k, the fourth wall 2a, and the fifth wall 2e.
- the seventh wall 2c is parallel to the front-rear direction B (perpendicular to the up-down direction A).
- the first wall 2j, the third wall 2m, the sixth wall 2d, and the eighth wall 2b are The second wall 2k, the fourth wall 2a, the fifth wall 2e, and the seventh wall 2c correspond to the flange, and correspond to the web.
- the fourth wall 2a and the seventh wall 2c are outer webs parallel to the collision direction.
- the fifth wall 2e and the second wall 2k are inner webs parallel to the collision direction.
- the first wall 2j connects the fifth wall 2e and the second wall 2k.
- the eighth wall 2b is located on the upstream side in the collision direction indicated by the arrow D, and the surface on the B1 side of the eighth wall 2b constitutes a collision surface (a surface orthogonal to the collision direction).
- the plate thickness of each flange and each web in the beam body 2 is 1.4 mm.
- the steel material constituting the beam body 2 has a Young's modulus of 21000 MPa and a density of 7874 kg / m 3 .
- the reinforcing plate 3 extends along the vertical direction A.
- the fourth wall 2a, the third wall 2m, and the second wall 2k are located above the first wall 2j and bulge from the reinforcing plate 3 to the B2 side in the front-rear direction B.
- the fifth wall 2e, the sixth wall 2d, and the seventh wall 2c are located below the first wall 2j and bulge from the reinforcing plate 3 to the B2 side in the front-rear direction B.
- the bulging portion 2s is configured. Each bulging part 2t, 2s surrounds the internal space inside.
- the fourth wall 2a and the seventh wall 2c constitute outer wall portions of the bulging portions 2t and 2s (wall portions extending from the reinforcing plate 3 in the direction perpendicular to the outer side of the beam body 2), respectively, and the second wall 2k and the fifth wall 2e constitute inner wall portions of the bulging portions 2t and 2s (wall portions extending in a direction perpendicular to the reinforcing plate 3 at positions closer to the other bulging portions than the outer wall portions).
- These four wall portions (the fourth wall 2a, the second wall 2k, the fifth wall 2e, and the seventh wall 2c) extend in the front-rear direction B, which is a direction intersecting the reinforcing plate 3, and extend in the vertical direction A. Are lined up.
- each wall portion is as follows.
- the second wall 2k extends from one end (the end portion on the A1 side) of the first wall 2j in a direction (front-rear direction B) intersecting the first wall 2j.
- the third wall 2m extends from the end of the second wall 2k on the B2 side (the end opposite to the first wall 2j) along the direction intersecting the second wall 2k.
- the third wall 2m extends from the end of the second wall 2k on the B2 side to the A1 side (the side opposite to the first wall 2j with respect to the second wall 2k).
- the fourth wall 2a extends from the end of the third wall 2m on the A1 side (the side opposite to the second wall 2k) along the direction intersecting the third wall 2m.
- the fourth wall 2a extends from the end of the third wall 2m on the A1 side to the B1 side (the second wall 2k side with respect to the third wall 2m).
- the fifth wall 2e extends from the other end (the end portion on the A2 side) of the first wall 2j in a direction intersecting the first wall 2j.
- the fifth wall 2e extends from the end portion on the A2 side of the first wall 2j to the B2 side (the same side as the second wall 2k with respect to the first wall 2j).
- the sixth wall 2d extends from the end of the fifth wall 2e on the B2 side (the side opposite to the first wall 2j) in a direction intersecting the fifth wall 2e.
- the sixth wall 2d extends from the end of the fifth wall 2e on the B2 side to the A2 side (the side opposite to the first wall 2j with respect to the fifth wall 2e).
- the seventh wall 2c extends from the end of the sixth wall 2d on the A2 side (the side opposite to the fifth wall 2e) in a direction intersecting the sixth wall 2d.
- the seventh wall 2c extends from the end of the sixth wall 2d on the A2 side to the B1 side (the fifth wall 2e side with respect to the sixth wall 2d).
- the eighth wall 2b constitutes a reference wall. That is, it extends along the direction parallel to the reinforcing plate 3, that is, the vertical direction A, and closes the inner space inside each of the bulging portions 2 t and 2 s, while the end portion of the fourth wall 2 a being the outer wall portion.
- the end opposite to the third wall 2m is connected to the end opposite to the sixth wall 2d of the end of the seventh wall 2c which is also the outer wall.
- the eighth wall 2b extends in the direction in which the first wall 2j extends.
- the reinforcing plate 3 extends along the reference line W, extends along the vertical direction A in any cross section orthogonal to the reference line W, and is perpendicular to the front-rear direction B. Attached to.
- the reinforcing plate 3 is attached to the end of the beam body 2 on the B1 side (the end away from the vehicle body). Specifically, the reinforcing plate 3 is disposed on the collision surface side (B1 side) of the beam body 2 and is attached by welding so that the respective surfaces are in close contact with the eighth wall 2b of the beam body 2. It has been.
- the reinforcing plate 3 according to this embodiment is attached over the entire front surface of the eighth wall 2b, thereby reinforcing the eighth wall 2b. That is, the reinforcing plate 3 in this embodiment functions as a reinforcing material for the beam body 2, particularly a reinforcing material for the eighth wall 2 b.
- the plate thickness of the reinforcing plate 3 according to this embodiment is 2.0 mm.
- the Young's modulus of the aluminum-based material constituting the reinforcing plate 3 is 6900 MPa, and the density is 2700 kg / m 3 .
- the reinforcing plate 3 is not limited to one made of an aluminum-based material, and may be made of another metal material.
- the reinforcing plate 3 extends linearly along the direction in which the first wall 2j extends (vertical direction A), and the direction is perpendicular to the first wall 2j.
- the beam body 2 is attached to the end of the B1 side (the side opposite to the third wall 2m and the sixth wall 2d).
- FIG. 2 is a cross-sectional view of the bumper beam 21 according to the second embodiment. The following description will focus on the parts different from the above embodiment, and the description of the same matters as in the above embodiment will be omitted.
- the bumper beam 21 according to this embodiment also includes a beam body 22 and a reinforcing plate 3. As shown in FIG. 2, the bumper beam 21 is formed so as to have a B-shaped cross section, but unlike the beam body 2 described above, the beam body 22 according to the present embodiment (corresponding to the beam body 2 described above). ) Is not provided with the eighth wall 2b, and the ends on the B1 side of the fourth wall 2a and the seventh wall 2c are free ends. These end portions are curved at the base portions thereof, and constitute projecting portions 2f projecting inwardly from the other portions of the fourth wall 2a and the seventh wall 2c.
- the protruding portions 2f of the fourth wall 2a and the seventh wall 2c protrude toward the lower side (A2 side) and the upper side (A1 side), respectively.
- the reinforcement board 3 is attached by welding so that the surface may closely_contact
- the surface on the B1 side of the reinforcing plate (first reinforcing plate) 3 constitutes a collision surface.
- the reinforcing plate 3 functions as a substitute member for the eighth wall 2 b in the beam body 2 and functions as a reinforcing material for the entire beam body 22.
- the Young's modulus of the beam body 22 is E st
- the density of the beam body 22 is ⁇ st
- the Young's modulus of the reinforcing plate 3 is E 2
- the density of the reinforcing plate 3 is ⁇ 2 .
- E st , E 2 , ⁇ st , and ⁇ 2 satisfy the condition shown in the following formula (1).
- the steel material that is the material of the beam body 22 and the aluminum-based material that is the material of the reinforcing plate 3 are selected so as to satisfy the conditions.
- Equation (2) if the Young's modulus of the beam body 22 is E st , the plate thickness of the beam body 22 is t st , the Young's modulus of the reinforcing plate 3 is E 2 , and the plate thickness of the reinforcing plate 3 is t 2 ,
- the beam main body 22 can be effectively reinforced by satisfying the relationship of the following formula (3). E st ⁇ t st 3 ⁇ E 2 ⁇ t 2 3 (3)
- the weight W of a certain material is expressed by the following formula (4), where ⁇ is the density of the material. W ⁇ ⁇ ⁇ t (4)
- the “attached part” means (i) when the reinforcing plate 3 is attached to the eighth wall 2b as a reinforcing material of the eighth wall 2b as the reference wall as in the first embodiment, It means the eighth wall 2b itself.
- the first wall through A reference wall corresponding to the eighth wall having the same thickness as the seventh wall is virtually determined, and this virtual wall corresponds to the attachment site.
- the reinforcing plate 3 functions as a reinforcing material for the eighth wall 2b
- the reinforcing plate 3 having substantially the same weight as the “eighth wall 2b” is attached to the beam body 2
- the weight of the eighth wall 2b and the reinforcing plate 3 is about twice the weight of the eighth wall 2b, while the buckling load of the eighth wall 2b and the reinforcing plate 3 is more than twice the buckling load of the eighth wall 2b. growing.
- the bumper beam only needs to satisfy at least the condition shown in Expression (1), and the condition shown in Expression (5) does not necessarily have to be satisfied.
- bumper beams of steel with different thicknesses bumper beams with flange steel reinforcement, bumper beams with flange aluminum reinforcement (1), and bumper beams with flange aluminum reinforcement (2)
- the bending moment was calculated.
- the “steel bumper beam” is a bumper beam that does not have the reinforcing plate 3 and corresponds to the beam body 2.
- the “bumper beam reinforced with flange steel” is the bumper beam 1 shown in FIG. 1 in which the reinforcing plate 3 is made of steel.
- the “bumper beam of flange aluminum reinforcement (1)” is the bumper beam 1 according to the first embodiment, and the “bumper beam of flange aluminum reinforcement (2)” is the bumper beam 21 according to the second embodiment shown in FIG. It is.
- the three-point bending analysis was performed using the central portion of the sixth wall 2d and the central portion of the third wall 2m as fulcrums and the central portion of the reinforcing plate 3 as a loading point.
- the bumper beam 1 and the bumper beam 21 can be regarded as beams whose portions near both ends (both ends in the width direction C) are supported by side members.
- the reinforcing material resists the load received by the bumper beam at the time of collision by the action of bending (in a state where the bending action is dominant). Therefore, the larger the maximum bending moment that the bumper beam can bear (durable), the higher the bending strength of the bumper beam.
- a 1470 MPa grade steel plate having a yield strength (Y P ) of 1200 MPa is used as a plate material constituting the beam body 2 and the beam body 22, and a 7000 series having a yield strength (Y P ) of 310 MPa is used as the reinforcing plate 3.
- An aluminum alloy was used. Table 1 shows the yield strength and thickness of the steel plate constituting the beam body, and the yield strength and thickness of the aluminum-based material constituting the reinforcing plate.
- FIG. 3 is a graph showing the simulation result of the maximum bending moment obtained by the above three-point bending analysis.
- the horizontal axis indicates the weight ratio based on the weight of a steel material having a thickness of 1.4 mm (1.0), and the vertical axis indicates the maximum bending moment in the steel material having a thickness of 1.4 mm.
- the maximum bending moment ratio based on (bending moment at buckling) is shown.
- the weight ratio of 1.43 indicates the result for the bumper beam having a plate thickness of 2.0 mm.
- the maximum bending moment of a steel bumper beam with a thickness of 1.4 mm (hereinafter referred to as “bumper beam BS”) is increased by increasing the thickness of the steel plate from 1.4 mm to 2.0 mm. It becomes clear that the weight of the bumper beam increases.
- the maximum bending moment ratio is larger than the bumper beam BS (bending moment ratio: about 1.2). It can be seen that the overall weight of the bumper beam also increases by the amount of the steel plate (weight ratio: about 1.25).
- the eighth wall 2b is reinforced by the reinforcing plate 3, so that the maximum bending moment ratio is larger than that of the bumper beam BS.
- the weight of the entire bumper beam also increases by the amount of the reinforcing plate 3 (weight ratio: about 1.08).
- the weight is smaller than the bumper beam BS (weight ratio: about 0.91). It can be seen that the maximum bending moment ratio is equivalent to that of the bumper beam BS (bending moment ratio: about 1.05).
- the bumper beam is effectively reinforced by fixing the reinforcing plate formed of aluminum or steel material to the B1 side of the beam main body formed of steel. Further, satisfying the conditions shown in the formula (1) by the Young's modulus and density of the beam body and the reinforcing plate makes it possible to improve the bending strength while minimizing the increase in weight.
- the outline of the bumper beam of the first embodiment and the second embodiment will be described again.
- the bumper beam 21 shown in FIG. 2 will be described as a typical structure.
- the bumper beam 21 is attached to the front portion of the vehicle body and extends along the reference line W.
- the bumper beam 21 is formed of a steel plate and extends along the reference line W.
- An aluminum reinforcing plate (first reinforcing plate) 3 that extends and is attached to the beam body 22.
- the reinforcing plate 3 extends linearly, and (b) the beam body 22 intersects the reinforcing plate 3 while surrounding the internal space. It has an upper bulging portion 2t and a lower bulging portion 2s that bulge in the direction in which the bulging occurs. That is, the cross section is B-shaped.
- the beam body 22 and the reinforcing plate 3 satisfy the following conditions.
- the beam body 22 is reinforced by disposing the reinforcing plate 3 made of an aluminum-based material at the front portion of the beam body 22. Further, the fact that the Young's modulus and density of the beam body 22 and the reinforcing plate 3 satisfy the above conditions makes it possible to improve the bending strength of the bumper beam 21 while minimizing an increase in the weight of the bumper beam 21. In other words, if the bumper beam is manufactured so as to satisfy the above conditions, the bending strength of the bumper beam 21 can be improved while minimizing the increase in the weight of the bumper beam 21.
- This manufacturing method includes an attachment step of attaching the reinforcing plate 3 to the beam body 22.
- FIG. 4 is a cross-sectional view of a bumper beam according to the third embodiment. The following description will focus on the parts different from the above embodiment, and the description of the same matters as in the above embodiment will be omitted.
- the bumper beam 31 includes a beam main body 32 made of a steel plate material and an aluminum reinforcing plate (first reinforcing plate) 33. As shown in FIG. 4, the bumper beam 31 has a B-shaped cross section.
- the beam main body 32 (corresponding to the above-described beam main body 2) according to the present embodiment does not have the eighth wall 2b, like the beam main body 22.
- projecting portions 2g that project linearly are formed at the ends of the fourth wall 2a and the seventh wall 2c on the B1 side.
- the two protruding portions 2g of the fourth wall 2a and the seventh wall 2c protrude upward and downward, and toward the B1 side, respectively. That is, the two protrusions 2g are inclined with respect to both the front-rear direction B and the vertical direction A.
- the reinforcement board 33 is attached to the front-end
- the reinforcing plate 33 is formed by extruding an aluminum-based material, and the B1 side surface of the reinforcing plate 33 constitutes a collision surface.
- the reinforcing plate 33 functions as a substitute member for the eighth wall 2 b in the beam body 2 shown in FIG. 1 and functions as a reinforcing material for the beam body 32.
- the reinforcing plate 33 has a main body portion 33b and two convex portions (first convex portions) 33a that protrude from the inner side surface (surface opposite to the collision surface) of the main body portion 33b.
- the main body 33b extends along the reference line W and extends in the vertical direction A, and has a plate thickness of about 10 mm.
- the both convex portions 33a protrude along the front-rear direction B, and the second wall 2k and the fifth wall 2e (that is, the inner wall portions of the bulging portions 2t, 2s) from both outer sides in the vertical direction A of the vehicle body. It is arranged so as to sandwich it.
- the protruding direction of both convex portions 33a is a direction intersecting the reinforcing plate 33, and is a direction orthogonal to the reinforcing plate 33 in the illustrated example. However, the protruding direction does not necessarily have to be orthogonal to the reinforcing plate 33, and may be a direction inclined with respect to the normal line of the reinforcing plate 33.
- the both convex portions 33a are respectively positioned at corners formed by the main body portion 33b and the second wall 2k and the fifth wall 2e, which are the two inner webs, and reinforce the inner web.
- the Young's modulus of the beam body 32 is E st
- the density of the beam body 32 is ⁇ st
- the Young's modulus of the reinforcing plate 33 is E 2
- the density of the reinforcing plate 33 is ⁇ 2 , E st , E 2 , ⁇ st , And ⁇ 2 satisfy Equation 1 above.
- two convex portions (first convex portions) 33a projecting from the reinforcing plate 33 in the direction intersecting (orthogonal in the figure) with respect to the reinforcing plate 33 are connected to the second wall 2k and the fifth wall 2e from both outer sides.
- the buckling of the second wall 2k and the fifth wall 2e (buckling in which the intermediate portion of the second wall 2k and the intermediate portion of the fifth wall 2e are deformed away from each other) is suppressed, and thereby the bumper beam Further improve the bending strength.
- the both convex portions 33a may be joined to each inner web by welding or adhesion.
- FIG. 5 is a cross-sectional view of the bumper beam 41 according to the fourth embodiment. The following description will focus on the parts different from the above embodiment, and the description of the same matters as in the above embodiment will be omitted.
- the bumper beam 41 includes a beam body 32 and an aluminum reinforcing plate (first reinforcing plate) 43.
- the bumper beam 41 has a B-shaped cross section as shown in FIG.
- the reinforcing plate 43 (corresponding to the above-mentioned reinforcing plate 33) is extruded and has a collision surface.
- the reinforcing plate 43 functions as a substitute member for the eighth wall 2 b in the beam body 2 and functions as a reinforcing material for the beam body 32.
- the reinforcing plate 43 has a main body portion 33b and two convex portions (second convex portions) 43a that protrude from the inner side surface (surface opposite to the collision surface) of the main body portion 33b. These convex portions 43a protrude along the front-rear direction B so as to sandwich the fourth wall 2a and the seventh wall 2c (that is, the outer wall portions of the bulging portions 2t and 2s) from both outer sides in the vertical direction A of the vehicle body. Has been placed.
- both convex portions 43 a is a direction intersecting the reinforcing plate 43, and is a direction orthogonal to the reinforcing plate 43 in the illustrated example, but the protruding direction is relative to the normal line of the reinforcing plate 43. It may be inclined.
- Both convex portions 43a are respectively positioned at corner portions formed by the main body portion 33b and the two outer webs, the fourth wall 2a and the seventh wall 2c, and reinforce each outer web.
- An inclined surface (inclined with respect to the up-and-down direction A and the front-and-rear direction B) having an inclination angle capable of coming into surface contact with both projecting portions 2g of the beam body 32 is provided inside the root portion of each convex portion 43a.
- Surface) 43b is formed, and the surfaces of the inclined surfaces 43b and the surfaces of the protrusions 2g corresponding to the surfaces are integrated so as to be in close contact with each other.
- the reinforcing plate 43 is attached to each protruding portion 2g that is the end portion on the B1 side in the beam main body 32.
- the Young's modulus of the beam body 32 is E st
- the density of the beam body 32 is ⁇ st
- the Young's modulus of the reinforcing plate 43 is E 2
- the density of the reinforcing plate 43 is ⁇ 2
- E st , E 2 , ⁇ st , And ⁇ 2 satisfy the above formula (1).
- two convex portions (second convex portions) 43a projecting from the reinforcing plate 43 in a direction intersecting (orthogonal in the figure) with respect to the reinforcing plate 43 are provided on the outer sides of the fourth wall 2a and the seventh wall 2c.
- the both convex portions 43a may be joined to each outer web by welding or adhesion.
- FIG. 6 is a cross-sectional view of a bumper beam 51 according to the fifth embodiment. The following description will focus on the parts different from the above embodiment, and the description of the same matters as in the above embodiment will be omitted.
- the bumper beam 51 includes a beam main body 32 and an aluminum reinforcing plate (first reinforcing plate) 53, and has a B-shaped cross section.
- the reinforcing plate 53 (corresponding to the reinforcing plate 33) is extruded and has a collision surface.
- the reinforcing plate 53 functions as a substitute member for the eighth wall 2 b in the beam body 2 and functions as a reinforcing material for the beam body 32.
- the reinforcing plate 53 includes a main body portion 33b, two convex portions 43a projecting from the inner side surface (the surface opposite to the collision surface) of the main body portion 33, and the inner side surface within a region sandwiched by the convex portions 43a. Two convex portions 33a projecting from are formed. That is, the reinforcing plate 53 according to this embodiment has both the convex portions 33a corresponding to the pair of first convex portions and the convex portions 43a corresponding to the pair of second convex portions.
- the Young's modulus of the beam body 32 is E st
- the density of the beam body 32 is ⁇ st
- the Young's modulus of the reinforcing plate 53 is E 2
- the density of the reinforcing plate 53 is ⁇ 2
- E st , E 2 , ⁇ st 1 and ⁇ 2 satisfy the above formula 1.
- the “steel bumper beam” is a bumper beam that does not have the reinforcing plate 3 and corresponds to the beam body 2.
- the “bumper beam of the flange aluminum reinforcement (3)” is the bumper beam 31 shown in FIG. 4, and the “bumper beam of the flange aluminum reinforcement (4)” is the bumper beam 41 shown in FIG.
- the “(5) bumper beam” is the bumper beam 51 shown in FIG. Note that the three-point bending analysis was performed with the two points of the center of the sixth wall 2d and the center of the third wall 2m as fulcrums and the center of the reinforcing plate as the loading point.
- a 1500 MPa class steel plate having a yield strength (Y P ) of 1200 MPa is used as a plate material constituting the beam main body 2 and the beam main body 32, and a yield strength (Y plate) is used as the reinforcing plate 33 (reinforcing plate 43, reinforcing plate 53).
- Y plate a yield strength
- a 7000 series aluminum alloy having a P ) of 310 MPa was used. Table 2 shows the yield strength and thickness of the steel plate constituting the beam body, and the yield strength and thickness of the aluminum-based material constituting the reinforcing plate.
- Fig. 7 is a graph showing the simulation results of the maximum bending moment by the three-point bending analysis. From the graph of FIG. 7, as in FIG. 3, in the bumper beam made of a single steel, it can be seen that when the plate thickness of the steel plate is increased, the maximum bending moment ratio is increased and the weight of the entire bumper beam is increased.
- the bumper beams (bumper beam 31, bumper beam 41, and bumper beam 51) of flange aluminum reinforcement (3), (4), and (5) are compared with a bumper beam of a steel plate having a thickness of 1.4 mm.
- weight ratio about 1.0 to 1.5
- the maximum bending moment ratio is the same as that of a single steel bumper beam with a thickness of 2.0 mm. That is, when compared at the same weight ratio (about 1.0), the maximum bending moment ratio of the flange aluminum reinforcements (3), (4), and (5) is more than the maximum bending moment of the bumper beam BS. You can see that it ’s big.
- the bumper beam is reinforced by arranging the reinforcing plate made of aluminum on the B1 side of the beam main body 32 made of steel. Further, the fact that the Young's modulus and density of the beam body and the reinforcing plate satisfy the relationship of the formula (1) makes it possible to improve the bending strength while minimizing the increase in weight.
- FIG. 8 is a cross-sectional view of the bumper beam 61 according to the first modification.
- FIG. 9 is a cross-sectional view of a bumper beam 71 according to a second modification.
- FIG. 10 is a cross-sectional view of a bumper beam 81 according to a third modification.
- FIG. 11 is a cross-sectional view of a bumper beam 91 according to a fourth modification.
- the following description will focus on parts different from those of the third to fifth embodiments, and description of matters similar to those of the third to fifth embodiments will be omitted.
- first reinforcing plate 63 includes a beam main body 2 and an aluminum reinforcing plate (first reinforcing plate) 63, and has a B-shaped cross section.
- the reinforcing plate 63 is attached over the entire front surface of the eighth wall 2b and reinforces the eighth wall 2b. That is, the reinforcing plate 63 in this embodiment functions as a reinforcing material for the eighth wall 2b.
- the reinforcing plate 63 is attached to the eighth wall 2b by welding so that the respective surfaces are in close contact with each other.
- the reinforcing plate 63 has a main body portion 33b and two convex portions (second convex portions) 63a that protrude from the inner surface (surface opposite to the collision surface) of the main body portion 33b.
- Both convex portions 63a (corresponding to the convex portions 43a described above) project along the front-rear direction B, and in the vertical direction A of the vehicle body, the fourth wall 2a and the seventh wall 2c (that is, the outer wall portions of the bulged portions 2t and 2s).
- both the convex parts 63a are each located in the corner
- the bumper beam 71 shown in FIG. 9 includes a beam main body 22 and a reinforcing plate 63.
- the reinforcing plate 63 is in close contact with the B1 side surfaces of the two protruding portions 2f of the beam main body 22. And is attached to the beam body 22 so that the upper surface of the fourth wall 2a, the bottom surface of the seventh wall 2c, and the inner surfaces of the two convex portions 63a are in close contact with each other.
- the 10 includes a combination of a beam main body 32 and a reinforcing plate 63.
- the beam body 92 is the same as the beam body 22 except for the shapes of the fourth wall 2a and the seventh wall 2c. Specifically, the fourth wall 2a and the seventh wall 2c of the beam main body 92 do not have the projecting portion 2f, and the front-rear direction B in the entire region from the end portion on the B2 side to the end portion on the B1 side. Is parallel to. Further, in the bumper beam 91 shown in FIG. 11, the reinforcing plate 33, the reinforcing plate 43, or the reinforcing plate 53 may be arranged instead of the reinforcing plate 63.
- FIG. 12A is a cross-sectional view of a bumper beam according to the sixth embodiment
- FIG. 12B is a cross-sectional view of a bumper beam according to the first modification.
- the bumper beam is symmetrical in the horizontal direction in FIGS. 12 (a) and 12 (b), so in FIGS. 12 (a) and 12 (b), the center line (dashed line) in the figure. Only the left side is shown, and explanation of the right side is omitted.
- the following description will focus on the parts different from the above embodiment, and the description of the same matters as in the above embodiment will be omitted.
- the bumper beam of the present embodiment includes a beam body 92 and an aluminum reinforcing plate (first reinforcing plate) 73 as shown in FIG.
- An end 2h on the B1 side of the seventh wall 2c is parallel to the front-rear direction B.
- the seventh wall 2c may be formed with the protruding portion 2f shown in FIG. 2 or the protruding portion 2g shown in FIG.
- the reinforcing plate 73 (corresponding to the reinforcing plate 33) is formed by extrusion and has a collision surface.
- the reinforcing plate 73 functions as an alternative member for the eighth wall 2b.
- the reinforcing plate 73 has a main body portion 33b, two convex portions 33a and two convex portions 63a protruding from the inner side surface (surface opposite to the collision surface) of the main body portion 33b.
- Each convex portion 33a is located at each corner formed by the main body portion 33b and the two inner webs (second wall 2k and fifth wall 2e), and reinforces each inner web.
- Each of the convex portions 63a is located at each corner formed by the main body portion 33b and the two outer webs (the fourth wall 2a and the seventh wall 2c), and reinforces each outer web.
- the front end portions (end portions 2h) of the fourth wall 2a and the seventh wall 2c and the two convex portions 63a are integrated by welding, and a weld bead portion 73W as shown in FIG. Is formed.
- the method of integrating the reinforcing plate 73 and the beam main body 92 is not limited to welding.
- the tips of the fourth wall 2a and the seventh wall 2c, The convex portion 63a may be integrated by adhesion (by an adhesive 73Y interposed between the both).
- two convex portions (second convex portions) 63a projecting in a direction orthogonal to the main body portion 33b of the reinforcing plate 73 sandwich the fourth wall 2a and the seventh wall 2c from both sides, And the following effects are produced by fixing with the tip part of these 4th wall 2a and the 7th wall 2c.
- each of the convex portions 63a may be a direction intersecting the reinforcing plate 73 in a cross section perpendicular to the reference line W, and may be inclined with respect to the normal line of the reinforcing plate 73, for example.
- the bumper beam according to the sixth embodiment is not limited to the above-described structure, and may be modified as shown in FIGS. 13 and 14, respectively. This modification will be described.
- symbol is attached
- 13A is a cross-sectional view of the bumper beam according to the second modification
- FIG. 13B is a cross-sectional view of the bumper beam according to the third modification
- FIG. 13C is a cross-sectional view of the bumper beam according to the fourth modification
- the description will focus on the parts different from the sixth embodiment, and the description of matters similar to those of the sixth embodiment will be omitted. Further, since the bumper beam according to each of the modifications has a symmetrical shape in the horizontal direction in FIGS. 13 and 14, only the left side of the center line (dashed line) is shown in FIGS. Omitted.
- 13A includes a reinforcing plate 73B (corresponding to the reinforcing plate 73) made of an aluminum material and a beam main body 92.
- a reinforcing plate 73B corresponding to the reinforcing plate 73
- concave portions 73c are formed inside the root portions of the respective convex portions 63a.
- Each of these recesses 73c accommodates the tips of the fourth wall 2a and the seventh wall 2c (tips of the end 2h), and is disposed in a region sandwiched between the two projections 63a. It is depressed on the B1 side from the B2 side surface.
- 13B includes a reinforcing plate 73C (corresponding to the reinforcing plate 73) made of an aluminum-based material and a beam body 22.
- a reinforcing plate 73C corresponding to the reinforcing plate 73
- concave portions 73d are formed on the inner sides of the root portions of the respective convex portions 63a.
- Each of these recesses 73d accommodates the tips of the fourth wall 2a and the seventh wall 2c (tips of the projecting portion 2f), and is disposed in a region sandwiched between the two projecting portions 63a. It is depressed on the B1 side from the surface on the B2 side.
- the bumper beam shown in FIG. 13C includes a reinforcing plate 73D (corresponding to the reinforcing plate 73) made of an aluminum-based material and a beam body 32.
- the reinforcing plate 73D includes a main body portion 33b having a collision surface, and two convex portions 33a and two convex portions 43a protruding from the inner side surface (surface opposite to the collision surface) of the main body portion 33b.
- Concave portions 73e are respectively formed inside the root portions of the respective convex portions 43a. These recesses 73e accommodate the tips of the fourth wall 2a and the seventh wall 2c (outer wall portions of the respective bulging portions 2t and 2s) (tips of the projecting portions 2g). It is arrange
- the concave portions 73c respectively formed inside the root portions of the two convex portions 63a of the reinforcing plate 73B accommodate the tips of the fourth wall 2a and the seventh wall 2c, respectively, and thereby the convex portions 63a and the
- the state in which the reinforcing plate 73B and the beam main body 92 are integrated with each other is suppressed at least in the beam state by suppressing the separation between the fourth wall 2a and the seventh wall 2c (decomposition due to the separation of both of them, that is, the separation at the weld bead portion 73W). Keep until the body 92 buckles. This suppresses buckling of the fourth wall 2a and the inside of the seventh wall 2c (buckling in which the intermediate portion of the fourth wall 2a and the intermediate portion of the seventh wall 2c are deformed toward each other).
- the 14 includes a reinforcing plate 83 (corresponding to the above-mentioned reinforcing plate 73) made of an aluminum-based material and a beam main body 92.
- the reinforcing plate 83 includes a main body portion 33b having a collision surface, two convex portions 33a and two convex portions projecting along the front-rear direction B from the inner side surface (surface opposite to the collision surface) of the main body portion 33b. (Third convex portion) 83b.
- the recessed part 83c is formed in the outer side of the root part of the two convex parts 83b, respectively. These concave portions 83c limit the movement of the end portions 2h toward the A1 side and the A2 side by accommodating the tips of the fourth wall 2a and the seventh wall 2c, respectively. It is formed at a position sandwiched from both outer sides in the direction A, and is recessed to the B1 side from the B2 side surface of the main body portion 33b. These concave portions 83c are respectively positioned at corner portions formed by the main body portion 33b and the two outer webs (the fourth wall 2a and the seventh wall 2c), and reinforce the outer web from the inside.
- the front end portions (end portions 2h) of the fourth wall 2a and the seventh wall 2c and the reinforcing plate 83 are integrated by welding to form a weld bead portion 83W shown in FIG.
- a portion of the weld bead portion 83W is located inside the recess 83c.
- the two convex portions 83b are each brought into contact with the outer web from the inside, thereby suppressing each outer web from buckling inward.
- the Young's modulus of the beam body in FIGS. 13 and 14 is E st
- the density of the beam body is ⁇ st
- the Young's modulus of the reinforcing plate is E 2
- the density of the reinforcing plate is ⁇ 2
- Young's modulus E st , E 2 and The densities ⁇ st and ⁇ 2 satisfy the above formula 1.
- the reinforcing plate 83 protrudes in a direction intersecting the main body portion 33b at a position sandwiched between the fourth wall 2a and the seventh wall 2c (outer wall portions of the bulging portions 2t and 2s).
- Two convex portions (third convex portions) 83b are formed, and these convex portions 83b are buckled of the fourth wall 2a and the seventh wall 2c (the intermediate portion of the fourth wall 2a and the intermediate portion of the seventh wall 2c). (Buckling that deforms in the direction in which they approach each other) is suppressed, thereby further improving the bending strength of the bumper beam.
- each of the convex portions 83b is fixed and integrated with the tip portions (end portions 2h) of the fourth wall 2a and the seventh wall 2c, the outer sides of the fourth wall 2a and the seventh wall 2c. Swelling buckling and inward buckling are suppressed.
- the recessed part 83c each formed in the outer side of the base part of each said convex part 83b of the reinforcement board 83 accommodates the front-end
- the buckling to the inner side (buckling in which the intermediate part of the fourth wall 2a and the intermediate part of the seventh wall 2c are deformed toward each other) is suppressed.
- each convex portion 83b may be a direction that intersects the reinforcing plate 83 in a cross section perpendicular to the reference line W, and may be inclined with respect to the normal line of the reinforcing plate 83.
- FIG. 15 is a cross-sectional view of the bumper beam 121 according to the seventh embodiment. The following description will focus on the parts different from the above embodiment, and the description of the same matters as in the above embodiment will be omitted.
- the bumper beam 121 includes a beam body 2 and two reinforcing plates (second reinforcing plates) 4, and has a B-shaped cross section.
- Each of the reinforcing plates 4 is manufactured by extruding an aluminum-based material, and is attached to the outer surfaces of the fourth wall 2a and the seventh wall 2c, respectively. Specifically, each reinforcing plate 4 is disposed in parallel to the fourth wall 2a and the seventh wall 2c, and is disposed in parallel to the front-rear direction B.
- the reinforcing plate 4 and the beam body 2 are integrated with each other by welding, and the surface of each reinforcing plate 4 and the surfaces of the fourth wall 2a and the seventh wall 2c are in close contact with each other.
- the two reinforcing plates 4 are arranged so as to sandwich the fourth wall 2a and the seventh wall 2c from both outer sides in the vertical direction A. Specifically, one reinforcing plate 4 is fixed to the lower surface of the seventh wall 2c, and the other reinforcing plate 4 is fixed to the upper surface of the fourth wall 2a.
- the two reinforcing plates 4 are attached to the entire outer surfaces of the fourth wall 2a and the seventh wall 2c, which are two outer webs, and reinforce the outer webs. That is, both the reinforcing plates 4 function as reinforcing materials for the fourth wall 2a and the seventh wall 2c, respectively.
- the thickness of each reinforcing plate 4 according to this embodiment is 2.0 mm
- the Young's modulus of the aluminum-based material constituting the reinforcing plate 4 is 6900 MPa
- the density is 2700 kg / m 3 .
- t 3 of the reinforcing plate 4 is set so as to satisfy the conditions shown in the following equation (7).
- t st is the plate thickness of the beam body 2.
- the thickness t 3 of the reinforcing plate 4 is set so as to satisfy the conditions shown in the following equation (8). 0.3 ⁇ t st ⁇ t 3 (8)
- Equation 9 is expressed by the following Equation (10).
- Equation (10) if the Young's modulus of the beam body 2 is E st , the plate thickness of the beam body 2 is t st , the Young's modulus of the reinforcing plate 4 is E 3 , and the plate thickness of the reinforcing plate 4 is t 3 , Effective reinforcement of the beam body 2 is achieved by satisfying the condition shown in the following formula (11). E st ⁇ t st 3 ⁇ E 3 ⁇ t 3 3 (11)
- the area of the attachment site is the same as the area of the reinforcing plate.
- the “attached part” corresponds to the fourth wall 2a and the seventh wall 2c according to the present embodiment.
- the second wall 2k (or the fifth wall 2e) corresponds to the “attached portion”.
- the weight of the fourth wall 2a and the reinforcing plate 4 is about twice the weight of the fourth wall 2a.
- the buckling load of the four walls 2a and the reinforcing plate 3 is larger than twice the buckling load of the fourth wall 2a. The same applies to the case where the reinforcing plate 4 is attached to the seventh wall 2c.
- the bumper beam according to the present embodiment does not necessarily satisfy Expression (13).
- the sample 10 includes a steel plate 12 a and an aluminum plate (a plate material made of an aluminum material) 13, and the steel plate 12 a is reinforced by the aluminum plate 13.
- the aluminum plate 13 and the steel plate 12a are arranged in parallel to each other, and are fixed so that their surfaces are in close contact with each other.
- the seat of the sample 10 is subjected to a force along the direction parallel to the aluminum plate 13 and the steel plate 12a and opposite to each other (see the arrow directions in the figure) on the upper and lower ends of the sample 10.
- the bending load was calculated.
- the steel plate 12a corresponds to the seventh wall 2c of FIG. 15, and the aluminum plate 13 corresponds to the reinforcing plate 4 of FIG. Therefore, by calculating the buckling load of the sample 10, the buckling load of the seventh wall 2c (and the fourth wall 2a) of the bumper beam 121 can be known.
- the steel plate 12a is 980 MPa class, and the aluminum plate 13 is made of a 7000 series aluminum alloy.
- Table 3 shows the plate thickness of the steel plate 12a and the plate thickness, weight ratio, plate thickness ratio, and buckling load ratio of the aluminum plate 13.
- FIG. 17 is a graph of the results in Table 3.
- the horizontal axis indicates a weight ratio based on the weight of a steel material with a thickness of 1.4 mm (without reinforcement) (1.0), and the vertical axis indicates a steel material with a thickness of 1.4 mm.
- the buckling load ratio based on the buckling load (without reinforcement) is shown.
- “steel plate” in the graph of FIG. 17 indicates a steel plate 12 a that is not reinforced by the aluminum plate 13, and “steel plate + aluminum plate” indicates the sample 10.
- the weight ratio of the steel plate 12a having a plate thickness of 2.5 mm and not reinforced by the aluminum plate 13 is 1.79, and the buckling load ratio is 5.69.
- the weight ratio of (2) the steel plate having a thickness of 1.4 mm and reinforced by the aluminum plate 13 having a thickness of 3.0 mm is 1.74, and the weight ratio of the steel plate of (1)
- the buckling load ratio is 16.63, which is about three times the buckling load ratio of the steel plate of (1).
- FIG. 18 is a cross-sectional view of a bumper beam 131 according to the eighth embodiment. The following description will focus on the parts different from the above embodiment, and the description of the same matters as in the above embodiment will be omitted.
- the bumper beam 131 according to this embodiment is obtained by adding two reinforcing plates (second reinforcing plates) 5 to the bumper beam 121 shown in FIG.
- Each reinforcing plate 5 is the same member as the reinforcing plate 4, and is used for reinforcing each of the two inner webs (the second wall 2k and the fifth wall 2e).
- the two reinforcing plates 5 are attached in a posture parallel to the second wall 2k and the fifth wall 2e, respectively, and are arranged in parallel to the front-rear direction B.
- Both the reinforcing plates 5 and the beam body 2 are integrated by welding, and the surfaces of both the reinforcing plates 5 and the surfaces of the second wall 2k and the fifth wall 2e are in close contact with each other.
- Both reinforcing plates 5 are sandwiched from both outer sides in the vertical direction A by the second wall 2k and the fifth wall 2e, one reinforcing plate 5 is on the upper surface of the fifth wall 2e, and the other reinforcing plate 5 is the fifth It is being fixed to the lower surface of the wall 2e, respectively.
- the two reinforcing plates 5 are attached to the entire outer surfaces of the second wall 2k and the fifth wall 2e, which are inner webs, and reinforce the inner webs.
- FIG. 19 is a graph of the results in Table 4.
- the horizontal axis shows the weight ratio based on the weight of steel material with 1.4 mm thickness (without reinforcement) (1.0), and the vertical axis shows steel material with 1.4 mm thickness (reinforcement). (None) shows the maximum bending moment ratio based on the maximum bending moment.
- the “steel plate” in the graph of FIG. 19 indicates a steel plate not reinforced with a plate made of an aluminum material, and “steel plate + aluminum plate” indicates the bumper beam 121 and the bumper beam 131.
- the maximum bending moment ratio of the bumper beam 131 made of only the beam body 2 formed of a steel plate having a thickness of 2.0 mm is 1.75, whereas the maximum bending moment ratio of the bumper beam 131 is 1.67. Therefore, the maximum bending moment ratio of the bumper beam 131 is not inferior to that of the beam body 2 made of a 2.0 mm thick steel plate.
- the weight ratio of the bumper beam 131 is 1.19 (the weight ratio of the beam body 2 made of a 2.0 mm thick steel plate is 1.41 (weight increase rate: 40%)). Weight increase rate: 20%).
- the outer web and the inner web of the beam body 2 made of steel are effectively reinforced by fixing the reinforcing plate made of aluminum to the entire surface. Further, satisfying the Young's modulus and density of the beam body and the reinforcing plate satisfying the condition shown in the formula (6) makes it possible to improve the bending strength while minimizing the increase in weight.
- the bumper beam according to the eighth embodiment is not limited to the structure described above.
- the modification is shown in FIG.20 and FIG.21.
- symbol is attached
- 20A is a cross-sectional view of a bumper beam 141 according to a first modification of the eighth embodiment
- FIG. 20B is an enlarged view of a portion surrounded by a circle 20B shown in FIG.
- FIG. 21 is a cross-sectional view of a bumper beam 151 according to a second modification of the eighth embodiment.
- the following description will focus on the parts different from the eighth embodiment, and the description of the same matters as in the eighth embodiment will be omitted.
- a bumper beam 141 shown in FIG. 20A includes a beam main body 2, two reinforcing plates (second reinforcing plates) 14, and a reinforcing plate composite 15.
- the two reinforcing plates 14 and the reinforcing plate composite 15 are made of a plate material (a plate material made of an aluminum-based material) bent in place.
- Each reinforcing plate 14 (corresponding to the above-described reinforcing plate 4) has an L shape in an arbitrary cross section orthogonal to the reference line W. Specifically, as shown in FIG. 20B, the reinforcing plate body 14a and a direction perpendicular to the reinforcing plate body 14a from one end of the reinforcing plate body 14a (in this embodiment) And a projecting wall 14c projecting in the vertical direction A).
- dents 2b 'shown in Fig. 20B are formed in both end portions (upper and lower end portions) of the front surface of the beam body 2.
- the recess 2 b ′ is recessed rearward of the front surface of the other part of the beam body 2.
- the reinforcing plate main body 14a is fixed to the entire outer surface of the outer web, while the protruding wall 14c is fixed to the eighth wall 2b in a state of being fitted into the recess 2b ′ of the eighth wall 2b. ing.
- the fitting of the protruding wall 14c into the recess 2b ′ causes the front surface position of the protruding wall 14c to coincide with the front surface position of the eighth wall 2b, so that the front surface of the protruding wall 14c and the front surface of the eighth wall 2b are on the same plane. Make it continuous.
- the reinforcing plate composite 15 is attached to an intermediate portion of the beam body 2 and includes two reinforcing plates 5 and a central wall 15c that connects one end of these reinforcing plates 5.
- the central wall 15c extends in parallel with the vertical direction A and is fixed to the first wall 2j so as to be in close contact with the entire surface of the first wall 2j.
- Both reinforcing plates 5 are fixed on the surfaces in close contact with the entire surfaces of the second wall 2k and the fifth wall 2e, respectively.
- the metal material forming the reinforcing plate 14 and the reinforcing plate composite 15 is not particularly limited as long as it satisfies the condition represented by the above formula (6).
- the beam body 2 is effectively reinforced by a small number of reinforcing plates. Moreover, since the positioning of the reinforcing plate 14 and the reinforcing plate composite 15 with respect to the beam body 2 is easy, the production efficiency of the bumper beam is improved.
- Each reinforcing plate 24 is made of a plate material made of an aluminum-based material bent at an appropriate position, and includes a reinforcing plate main body 24a and protruding walls 24c formed at both ends thereof.
- the reinforcing plate main body 24a is fixed on the outer surface of the corresponding outer web, while the protruding walls 24c are part of the front surface of the eighth wall 2b and the third wall 2m ( Alternatively, they are fixed in close contact with a part of the rear surface of the sixth wall 2d).
- the same recess as the recess 2b ' may be formed at both ends of the eighth wall 2b.
- depressions recessed along the front-rear direction B may also be formed at the end portions (end portions in the vertical direction A) of the third wall 2m and the sixth wall 2d.
- a bumper beam 121 shown in FIG. 15 will be described as a typical structure.
- the bumper beam 121 is attached to the front portion of the vehicle body and extends along the reference line W.
- the bumper beam 121 is formed of a steel plate material, and includes a beam body 2 extending along the reference line W, and an aluminum-based material. And two reinforcing plates (second reinforcing plates) 4 extending along the reference line W and attached to the beam body 2.
- the beam body 2 has, in an arbitrary cross section perpendicular to the reference line W, (a) an eighth wall (reference wall) 2b extending linearly and (b) a direction intersecting the eighth wall 2b while surrounding the internal space. It has an upper bulging portion 2t and a lower bulging portion 2s that bulge, and these constitute a B-shaped cross section.
- the upper bulging portion 2t has a fourth wall 2a which is an outer wall portion and a second wall 2k which is an inner wall portion
- the lower bulging portion 2s is a fifth wall which is an inner wall portion.
- It has the wall 2e and the 7th wall 2c which is an outer side wall part.
- the reinforcing plate 4 is attached in a posture parallel to each of the fourth wall 2a and the seventh wall 2c which are the outer wall portions. Further, the reinforcing plate 4 and the beam body 2 satisfy the following conditions. (E st / ⁇ st 3 ) ⁇ (E 3 / ⁇ 3 3 ) E st : Young's modulus of the beam body ⁇ st : Density of the beam body E 3 : Young's modulus of the second reinforcing plate ⁇ 3 : Density of the second reinforcing plate
- the two reinforcing plates 4 formed of a plate material made of an aluminum-based material (aluminum or aluminum alloy) are disposed on the two outer webs (the fourth wall 2a and the seventh wall 2c) of the beam main body, respectively, so that the beam The main body 2 is efficiently reinforced.
- the fact that the Young's modulus and density of the reinforcing plate 4 and the beam body 2 satisfy the above-described conditions makes it possible to improve the bending strength of the bumper beam while minimizing the increase in the weight of the bumper beam.
- the bumper beam 121 satisfies the following conditions. t 3 ⁇ ( ⁇ st / ⁇ 3 ) ⁇ t st t 3 : thickness of the reinforcing plate 4 t st : plate thickness of the beam body 2
- the increase in the weight of the portion to which the reinforcing plate 4 is attached due to the addition of the reinforcing plates 4 is less than twice the weight of the wall portion (the fourth wall 2a or the seventh wall 2c) to which the reinforcing plate 4 is attached. It is possible to suppress to.
- the weight of the portion to be attached for attaching the reinforcing plate 4 to the fourth wall 2a is less than twice the weight of the fourth wall 2a.
- the bumper beam 121 also satisfies the following conditions. 0.3 ⁇ t st ⁇ t 3
- the reinforcing plate 4 that satisfies this condition reliably improves the bending strength of the bumper beam.
- This manufacturing method includes an attachment step of attaching the reinforcing plate 4 to the beam body 2.
- convex portion 33a, convex portion 43a, convex portion 63a, convex portion 83a, and convex portion 83b may not be formed integrally with the main body portion of the reinforcing plate.
- these convex portions may be formed by a member different from the plate material constituting the main body portion of the reinforcing plate, and may be fixed to the plate material by welding or the like.
- the reinforcing plate may not be bonded over the entire surface of each web.
- the surface area of the reinforcing plate may be smaller than the surface area of the web, and the surface of the reinforcing plate and a part of the surface of the web may be combined. May be combined.
- the method of attaching the reinforcing plate to the web is not limited to the method of joining the surfaces of the two.
- a reinforcing plate may be embedded on the web surface.
- the collision direction with the collision target may not coincide with the front-rear direction and may be inclined with respect to the front-rear direction. That is, the collision direction may not be orthogonal to the first reinforcing plate or the eighth wall 2b.
- the second reinforcing plate may be attached not to the outside of the beam body but to the inside.
- the reinforcing plate 4 shown in FIG. 15 is not the outer surface of the fourth wall 2a and the seventh wall 2c, but the inner surface (the left surface of the fourth wall 2a and the right surface of the seventh wall 2c in FIG. 15). It may be attached to.
- the bumper beam according to the present invention is not limited to being attached to the front part of the vehicle body as in the above-described embodiments, but may be attached to the rear part of the vehicle body.
- the cross section perpendicular to the reference line W of the bumper beam according to each of the embodiments is uniform in the longitudinal direction of the bumper beam.
- the bumper beam according to the present invention is not limited to the one having a uniform cross section.
- the at least one cross section orthogonal to the cross section it is sufficient that the conditions for the shapes of the beam body and the reinforcing plate described so far are satisfied.
- the present invention provides a bumper beam capable of minimizing an increase in weight and improving bending strength.
- the bumper beam according to the first aspect of the present invention is attached to the front part or the rear part of the vehicle body and extends along a reference line, and is a beam made of a metal plate and extending along the reference line.
- the beam body and the first reinforcing plate satisfy the following conditions. (E st / ⁇ st 3 ) ⁇ (E 2 / ⁇ 2 3 ) E st : Young's modulus of the beam body ⁇ st : Density of the beam body E 2 : Young's modulus of the first reinforcing plate ⁇ 2 : Density of the first reinforcing plate
- the bumper beam is attached to the vehicle body such that the first reinforcing plate is located outside the beam body (in the case of a front bumper, on the front side of the beam body, and in the case of a rear bumper, on the rear side of the beam body). Good. Thereby, the first reinforcing plate can reinforce the beam body.
- the fact that the Young's modulus and density of the beam body and the first reinforcing plate satisfy the above conditions makes it possible to improve the bending strength of the bumper beam while minimizing the increase in the weight of the bumper beam.
- the material of the beam body and the first reinforcing plate may be the same material or different materials. Suitable combinations of the “beam main body—first reinforcing plate” include, for example, “steel-aluminum”, “steel-steel”, “steel-copper”, and “copper-copper”.
- the cross-sectional shape as described above is formed, that is, the first reinforcing plate extends linearly, and the beam body bulges from the first reinforcing plate in a direction intersecting with the first reinforcing plate. It is sufficient that each bulging portion surrounds the internal space together with the first reinforcing plate as long as it is established for at least one of the cross sections perpendicular to the reference line, and not necessarily all the cross sections of the bumper beam. In the above, the cross-sectional shape may not exist.
- the direction in which the bumper beam extends may be parallel to the width direction of the vehicle body or may be inclined with respect to the width direction.
- the reference line may be a straight line or a curved line (for example, an arcuate or other curved line).
- the angle of the “intersection” is not limited to a right angle, and may be an angle smaller than the right angle.
- each bulge portion extends in a direction intersecting the first reinforcing plate.
- an inner wall portion extending in a direction intersecting the first reinforcing plate at a position closer to the other bulging portion than the outer wall portion, and the outer wall portion and the inner wall portion are Those arranged side by side along the first reinforcing plate are included.
- the four wall portions including the inner wall portions and the outer wall portions may be parallel to or inclined with respect to the front-rear direction of the vehicle body. Further, the angle at which these wall portions and the first reinforcing plate intersect may be a right angle or a smaller angle.
- the first projecting portion protrudes from the first reinforcing plate in a direction intersecting the longitudinal direction from the first reinforcing plate and sandwiches both inner side wall portions from the outside.
- the second convex portion protrudes from the first reinforcing plate in a direction intersecting the longitudinal direction and sandwiches both outer wall portions from the outside. Is also preferably provided. These second convex portions suppress the buckling of the respective outer wall portions (buckling in which intermediate portions of these outer wall portions deform outward or away from each other), thereby further improving the bending strength of the bumper beam. Improve.
- each of the outer wall portions is fixed to a corresponding second convex portion. This more effectively suppresses the buckling of the outer wall portions in both the inner and outer directions. Specifically, the suppression of buckling in which each outer wall portion bulges outward (buckling in which the intermediate portion of the outer wall portion deforms outward, i.e., in a direction away from each other) is performed by (i) each of the second convex portions. And (ii) integration of each outer wall portion and the corresponding second convex portion increases the buckling load. That is achieved.
- each outer wall part and the 2nd convex part corresponding to this suppress the buckling which each outer wall part dents inward (buckling which the intermediate part of the said outer wall part deform
- each outer wall portion to the corresponding second convex portion
- the means for fixing each outer wall portion to the corresponding second convex portion includes adhesion, welding, bolting, and the like.
- a recess for accommodating the tip of the corresponding outer wall portion is provided at a position inside the root portion of each of the second protrusions in the first reinforcing plate. More preferably, each is formed.
- the accommodation of the tip of the outer wall portion in these concave portions suppresses the outer wall portion and the second convex portion from being peeled off at the joint portion, and the first reinforcing plate and the beam body are integrated. This state is maintained at least until the beam body is buckled and deformed. Thereby, the buckling to the inner side of each outer wall part (buckling which deform
- a third protrusion that protrudes from the first reinforcing plate in a direction intersecting the longitudinal direction from the first reinforcing plate and restrains both outer wall portions from the inner side. It is also preferable that an outer wall portion corresponding to the third convex portion is fixed to each third convex portion.
- These third convex portions suppress buckling inward of the respective outer wall portions (buckling in which intermediate portions of these outer wall portions are deformed inward, that is, in a direction toward each other), and thereby the bending of the bumper beam. Further improve the strength. Further, the integration of each outer wall portion and the first reinforcing plate suppresses the buckling of the outer wall portion that bulges outward and the buckling that shrinks inward.
- Each of the third convex portions is also formed with a concave portion for accommodating the tip of the corresponding outer wall portion at a position outside the root portion of each third convex portion of the first reinforcing plate. It is more preferable.
- the accommodation of the tip of the outer wall portion in these concave portions suppresses the outer wall portion and the third convex portion from being peeled off at the joint portion, and the first reinforcing plate and the beam body are integrated. This state is maintained at least until the beam body is buckled and deformed. Thereby, the buckling to the inner side of each outer wall part (buckling which deform
- means for fixing the outer wall portions to the corresponding third convex portions include adhesion, welding, bolting, and the like.
- the material of the first reinforcing plate for example, aluminum or aluminum alloy (such as duralumin) is preferable. By using these materials, a lightweight first reinforcing plate can be obtained. Moreover, the use of an aluminum alloy increases the strength of the first reinforcing plate as compared with the case of using pure aluminum.
- the bumper beam according to the second aspect of the present invention is attached to the front part or the rear part of the vehicle body and extends along a reference line, and is a beam made of a metal plate and extending along the reference line.
- the beam body includes a reference wall extending linearly, and a pair of bulge portions that bulge from the reference wall in a direction intersecting the reference wall while surrounding an internal space.
- each bulging portion intersects the first reinforcing plate at a position closer to the other bulging portion than the outer wall portion, and an outer wall portion extending in a direction intersecting the reference wall. And an outer wall portion and an inner wall portion that are arranged side by side along the reference wall.
- the second reinforcing plate is attached to at least one of the inner wall portions and the outer wall portions in a posture parallel to it.
- the beam body and the second reinforcing plate satisfy the following conditions. (E st / ⁇ st 3 ) ⁇ (E 2 / ⁇ 2 3 ) E st : Young's modulus of the beam body ⁇ st : Density of the beam body E 3 : Young's modulus of the second reinforcing plate ⁇ 3 : Density of the second reinforcing plate
- the beam main body can be reinforced by attaching a second reinforcing plate made of a metal material to at least one wall portion.
- a second reinforcing plate made of a metal material
- the material of the beam body and the reinforcing plate may be the same material or different materials.
- suitable combinations of “beam main body—second reinforcing plate” include “steel-aluminum”, “steel-steel”, “steel-copper”, and “copper-copper”.
- the cross-sectional shape as described above is formed, that is, the beam body includes a reference wall extending linearly and a pair of bulge portions that bulge from the reference wall in a direction intersecting the reference wall while surrounding the internal space.
- Each bulging part has an inner wall part and an outer wall part extending in a direction intersecting with the reference wall, and each inner wall part and each outer wall part are arranged along the reference wall.
- the second reinforcing plate is attached to at least one of the inner wall portion and the outer wall portion in a posture parallel to the at least one of the cross sections perpendicular to the reference line.
- the direction in which the bumper beam extends may be parallel to the width direction of the vehicle body or may be inclined with respect to the width direction.
- the reference line may be a straight line or a curved line (for example, an arcuate or other curved line).
- the angle of the “intersection” is not limited to a right angle, and may be an angle smaller than the right angle.
- the wall portions may be parallel or inclined with respect to the front-rear direction. Further, the angle at which these wall portions and the reference wall intersect is not limited to a right angle.
- the second reinforcing plate may be a single sheet or a plurality of sheets. For example, a total of two second reinforcing plates may be attached to both outer wall portions, or a total of four second reinforcing plates may be attached to both outer wall portions and inner wall portions, respectively.
- a protruding wall that protrudes in a direction perpendicular to the other part of the second reinforcing plate may be formed at the front end or the rear end of the second reinforcing plate.
- the second reinforcing plate may be attached to the outer surface of the beam body or may be attached to the inner surface.
- Means for connecting and integrating the beam body and the second reinforcing plate include welding, screwing, adhesion, and the like.
- the bumper beam of (10) preferably satisfies the following conditions. t 3 ⁇ ( ⁇ st / ⁇ 3 ) ⁇ t st t st : thickness of the beam body t 3 : thickness of the second reinforcing plate
- the sum of the weight of the second reinforcing plate and the weight of the wall portion to which the second reinforcing plate is attached is suppressed to less than twice the weight of the wall portion alone. That is, the weight including the second reinforcing plate of the wall portion to which the second reinforcing plate is attached is less than twice the weight of the wall portion.
- the bumper beam of (10) satisfies the following conditions. 0.3 ⁇ t st ⁇ t 3
- the material of the second reinforcing plate for example, aluminum or an aluminum alloy (such as duralumin) is preferable. By using these materials, a lightweight first reinforcing plate can be obtained. Moreover, the use of an aluminum alloy increases the strength of the first reinforcing plate as compared with the case of using pure aluminum.
- a bumper beam for solving the above-described problem is attached to the front part or the rear part of the vehicle body and extends along a reference line, and extends along the reference line.
- a metal beam body including two walls, a third wall, a fourth wall, a fifth wall, a sixth wall, and a seventh wall; and a metal first reinforcing plate extending along the reference line. And the following conditions A and B may be satisfied.
- the second wall extends from one end of the first wall in a direction intersecting the first wall.
- the third wall extends from the end of the second wall opposite to the first wall in a direction intersecting the second wall and with respect to the second wall. Extends to the opposite side of the wall.
- the fourth wall extends from the end of the third wall opposite to the second wall in a direction intersecting the third wall and with respect to the third wall. Extends to the side of the wall.
- the fifth wall extends from the other end of the first wall in a direction intersecting the first wall and on the same side as the second wall with respect to the first wall.
- the sixth wall extends from the end of the fifth wall opposite to the first wall in a direction intersecting the fifth wall and with respect to the fifth wall. Extends to the opposite side of the wall.
- the seventh wall is formed in the fifth wall with respect to the sixth wall in a direction intersecting the sixth wall from an end of the sixth wall opposite to the fifth wall. Extends to the side of the wall.
- the reinforcing plate extends in a direction in which the first wall extends, and is opposite to the third wall and the sixth wall of the beam body with respect to a direction perpendicular to the first wall. It is attached to the end of the.
- the beam body and the reinforcing plate satisfy the following conditions. (E st / ⁇ st 3 ) ⁇ (E 2 / ⁇ 2 3 ) E st : Young's modulus of the beam body ⁇ st : Density of the beam body E 2 : Young's modulus of the reinforcing plate ⁇ 2 : Density of the reinforcing plate
- the second wall, the fourth wall, the fifth wall, and the seventh wall may be parallel or inclined with respect to the front-rear direction.
- the first wall, the third wall, and the sixth wall may be parallel or inclined with respect to the vertical direction.
- each of the first to seventh walls may extend linearly or in a curved line in at least one cross section perpendicular to the reference line. Further, the intersection angle of all “intersections” is not limited to a right angle.
- the beam body is connected to the eighth wall (the end of the fourth wall opposite to the third wall and the end of the seventh wall opposite to the sixth wall, and the first wall There may or may not be a wall portion extending in the extending direction.
- the end of the fourth wall or the seventh wall (the end of the fourth wall opposite to the third wall, and the sixth wall of the seventh wall)
- a projecting portion extending in a direction orthogonal to the fourth wall and the seventh wall may be formed on the opposite end.
- the eighth wall may be parallel or inclined with respect to the vertical direction.
- the eighth wall may extend linearly or may extend curvedly.
- the reinforcing plate may be attached to the fourth wall and the seventh wall, or may be attached to the surface of the first wall.
- the reinforcing plate may be attached to the surface of the eighth wall.
- means for connecting and integrating the beam body and the reinforcing plate include welding, screwing, bonding, and the like.
- a bumper beam for solving the above-described problem is attached to the front part or the rear part of the vehicle body and extends along a reference line, and extends along the reference line.
- a metal beam body comprising two walls, a third wall, a fourth wall, a fifth wall, a sixth wall, a seventh wall, and an eighth wall, and a second metal reinforcing plate extending along the reference line And the following conditions C and D may be satisfied.
- the second wall extends from one end of the first wall in a direction intersecting the first wall.
- the third wall extends from the end of the second wall opposite to the first wall in a direction intersecting the second wall and with respect to the second wall. Extends to the opposite side of the wall.
- the fourth wall extends from the end of the third wall opposite to the second wall in a direction intersecting the third wall and with respect to the third wall. Extends to the side of the wall.
- the fifth wall extends from the other end of the first wall in a direction intersecting the first wall and on the same side as the second wall with respect to the first wall.
- the sixth wall extends from the end of the fifth wall opposite to the first wall in a direction intersecting the fifth wall and with respect to the fifth wall. Extends to the opposite side of the wall.
- the seventh wall is formed in the fifth wall with respect to the sixth wall in a direction intersecting the sixth wall from an end of the sixth wall opposite to the fifth wall. Extends to the side of the wall.
- the eighth wall connects the end of the fourth wall opposite to the third wall and the end of the seventh wall opposite to the sixth wall; and The second reinforcing plate extends parallel to at least one of the second wall, the fourth wall, the fifth wall, and the seventh wall. It is attached.
- the beam body and the second reinforcing plate satisfy the following conditions. (E st / ⁇ st 3 ) ⁇ (E 3 / ⁇ 3 3 ) E st : Young's modulus of the beam body ⁇ st : Density of the beam body E 3 : Young's modulus of the second reinforcing plate ⁇ 3 : Density of the second reinforcing plate
- the second wall, the fourth wall, the fifth wall, and the seventh wall may be parallel or inclined with respect to the front-rear direction.
- the first wall, the third wall, the sixth wall, and the eighth wall may be parallel or inclined with respect to the vertical direction.
- each of the first to eighth walls may extend linearly or may extend in a curve in at least one cross section perpendicular to the reference line. Further, the intersection angle of all the above “intersections” is not limited to a right angle.
- the second reinforcing plate may be a single sheet or a plurality of sheets. For example, a total of two second reinforcing plates may be attached to the fourth wall and the seventh wall, respectively, or a total of four second reinforcing plates include the second wall, the fourth wall, the fifth wall, and Each may be attached to the seventh wall.
- the second reinforcing plates attached to the second wall and the fifth wall may be connected by a connecting plate (a plate extending in the direction in which the first wall extends).
- vertically with respect to the other part of a 2nd reinforcement board may be formed in the front end or rear end of a 2nd reinforcement board.
- the 2nd reinforcement board may be attached to the outer surface of the beam main body, and may be attached to the inner surface.
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Abstract
Description
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E2:第1補強板のヤング率
ρ2:第1補強板の密度
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E3:第2補強板のヤング率
ρ3:第2補強板の密度
本発明の第1実施形態におけるバンパビーム1について、図1及び図22を用いて説明する。図1は、本発明の第1実施形態に係るバンパビーム1の断面図である。また、図22は、第1実施形態に係るビーム本体の斜視図である。なお、図1の断面は、バンパビーム1の少なくとも一つの断面(基準線Wに対して垂直な断面のうちの少なくとも一つ)であり、図1は、図22のI-I線における断面を示す。
図1に示すように、バンパビーム1はB字形の断面を有するもので、鋼製の板材からなるビーム本体2と、アルミニウム系材料(アルミニウムまたはアルミニウム合金)からなる補強板3とを備える。図22に示すように、ビーム本体2は、破線で示される基準線Wに沿って延び、上面視において、湾曲した弓なりの形状を有する。基準線Wの方向は、幅方向C(左右方向;図の矢印C方向参照)にほぼ一致している。より詳細には、基準線Wは、幅方向に対して湾曲している。図1は、基準線Wに対して垂直な断面を示すが、この断面は幅方向Cに対してもほぼ垂直な断面といえる。
ビーム本体2は、板材からなり、基準線Wに対して垂直な断面がB字形となるように形成されている。具体的に、このビーム本体2は、第1壁(中央フランジ)2j、第2壁(内側ウェブ)2k、第3壁(後側フランジ)2m、第4壁(外側ウェブ)2a、第5壁(内側ウェブ)2e、第6壁(後側フランジ)2d、第7壁(外側ウェブ)2c、及び、第8壁(前側フランジ;基準壁)2bの各壁部を有し、基準線Wに沿って延びる。
補強板3は、基準線Wに沿って延び、基準線Wに対して直交する任意の断面において上下方向Aに沿って延び、かつ、前後方向Bに対して垂直となるように、ビーム本体2に取り付けられる。補強板3は、ビーム本体2における、B1側の端部(車体から離れた方の端部)に取り付けられる。具体的に、補強板3は、ビーム本体2の衝突面側(B1側)に配置され、前記ビーム本体2の第8壁2bに対して、それぞれの表面同士が密着するように、溶接により取り付けられている。
次に、本発明の第2実施形態におけるバンパビーム21について、図2を用いて説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図2は、第2実施形態に係るバンパビーム21の断面図である。以下、上記の実施形態とは異なる部分を中心に説明し、上記の実施形態と同様の事項については、その説明を省略する。
次に、第1実施形態及び第2実施形態における、ヤング率及び密度の関係について説明する。ここでは、代表例としてバンパビーム21の構造が説明される。
Est/ρst 3 < E2/ρ2 3 ・・・(1)
Pcr ∝ E・t3 ・・・(2)
Est・tst 3<E2・t2 3 ・・・(3)
W ∝ ρ・t ・・・(4)
ρst・tst=ρ2・t2 ・・・(5)
Est/ρst 3=4.30×10^(-8) [MPa・m/kg3]
E2/ρ2 3 =3.51×10^(-7) [MPa・m/kg3]
となるので、式(1)の条件が満たされている。
次に、バンパビームにおける曲げモーメントの評価結果について説明する。ここでは、5種類のバンパビーム(互いに板厚の異なる鋼単体のバンパビーム、フランジ鋼補強のバンパビーム、フランジアルミニウム補強(1)のバンパビーム、フランジアルミニウム補強(2)のバンパビーム)について、3点曲げ解析により最大曲げモーメントを算出した。
第1実施形態及び第2実施形態のバンパビームの概要を改めて説明する。ここでは、代表的な構造として、図2に示されるバンパビーム21について説明する。バンパビーム21は、車体の前部に取り付けられ、基準線Wに沿って延びるものであって、鋼製の板材で形成されて基準線Wに沿って延びるビーム本体22と、基準線Wに沿って延び、ビーム本体22に取り付けられたアルミニウム製の補強板(第1補強板)3と、を有する。
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E2:補強板のヤング率
ρ2:補強板の密度
次に、本発明の第3実施形態におけるバンパビーム31について、図4を用いて説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図4は、第3実施形態に係るバンパビームの断面図である。以下、上記の実施形態とは異なる部分を中心に説明し、上記の実施形態と同様の事項については、その説明を省略する。
バンパビーム31は、鋼製の板材からなるビーム本体32と、アルミニウム製の補強板(第1補強板)33とを有する。バンパビーム31は、図4に示すように、断面がB字形になっている。本実施形態に係るビーム本体32(上記のビーム本体2に相当)は、ビーム本体22と同様に、第8壁2bを有しない。また、第4壁2a及び第7壁2cのそれぞれの、B1側の端部には、直線的に突出する突出部2gが形成されている。第4壁2a及び第7壁2cの二つの突出部2gは、それぞれ、上方及び下方へ向かって、且つ、B1側へ向かって突出している。すなわち、二つの突出部2gは、前後方向B及び上下方向Aの両方に対して傾いている。そして、補強板33は、二つの突出部2gの、B1側の先端に取り付けられている。
上記バンパビーム31では、補強板33からこれに対して交差する(図では直交する)方向に突出する二つの凸部(第1凸部)33aが第2壁2k及び第5壁2eを両外側から挟むことにより、これら第2壁2k及び第5壁2eの座屈(第2壁2kの中間部位及び第5壁2eの中間部位が互いに離れる方向に変形する座屈)を抑制し、これによりバンパビームの曲げ強度を更に向上させる。
次に、本発明の第4実施形態におけるバンパビーム41について、図5を用いて説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図5は、第4実施形態に係るバンパビーム41の断面図である。以下、上記の実施形態とは異なる部分を中心に説明し、上記の実施形態と同様の事項については、その説明を省略する。
前記バンパビーム41では、補強板43からこれに対して交差する(図では直交する)方向に突出する二つの凸部(第2凸部)43aが、第4壁2a及び第7壁2cを両外側から挟むことにより、これら第4壁2a及び第7壁2cの座屈(第4壁2aの中間部位及び第7壁2cの中間部位が互いに離れる方向に変形する座屈)を抑制し、これにより、バンパビームの曲げ強度を更に向上させる。
次に、本発明の第5実施形態におけるバンパビーム51について、図6を用いて説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図6は、第5実施形態に係るバンパビーム51の断面図である。以下、上記の実施形態とは異なる部分を中心に説明し、上記の実施形態と同様の事項については、その説明を省略する。
次に、バンパビームにおける曲げモーメントの評価結果について説明する。ここでは、5種類のバンパビーム(互いに板厚の異なる2種類の鋼単体のバンパビーム、フランジアルミニウム補強(3)のバンパビーム、フランジアルミニウム補強(4)のバンパビーム、フランジアルミニウム補強(5)のバンパビーム)を用いて、3点曲げ解析により、各バンパビームの曲げモーメントを算出した。
バンパビームの具体的な構造は上述のものに限定されず、例えば図8乃至図11に示すものであってもよい。以下、図8乃至図11に示す変形例について説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図8は、第1変形例に係るバンパビーム61の断面図である。図9は、第2変形例に係るバンパビーム71の断面図である。図10は、第3変形例に係るバンパビーム81の断面図である。図11は、第4変形例に係るバンパビーム91の断面図である。以下、上記の第3乃至第5実施形態とは異なる部分を中心に説明し、上記の第3乃至第5実施形態と同様の事項については、その説明を省略する。
次に、本発明の第6実施形態におけるバンパビームについて図12(a)(b)を参照しながら説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図12の(a)は第6実施形態に係るバンパビームの断面図、(b)はその第1変形例に係るバンパビームの断面図である。なお、本実施形態においては、バンパビームが、図12(a)(b)における左右方向について対称となっているため、図12(a)(b)においては、図の中心線(一点鎖線)の左側のみ示し、右側についての説明を省略する。以下、上記の実施形態とは異なる部分を中心に説明し、上記の実施形態と同様の事項については、その説明を省略する。
本実施形態のバンパビームは、図12(a)に示すように、ビーム本体92と、アルミウム製の補強板(第1補強板)73とを備える。第7壁2cのB1側の端部2hは、前後方向Bに平行である。この第7壁2cには、前記端部2hの代わりに、図2に示した突出部2fや、図4に示した突出部2gが形成されてもよい。
本実施形態のバンパビームでは、補強板73の本体部33bからこれと直交する方向に突出する二つの凸部(第2凸部)63aが、第4壁2a及び第7壁2cを両側から挟み、かつ、これらの第4壁2a及び第7壁2cの先端部と固定されることにより、次の効果を奏する。
この第6の実施形態のバンパビームは上述の構造に限定されず、変形例として図13及び図14にそれぞれ示すものであってもよい。この変形例について説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図13の(a)は第2変形例に係るバンパビームの断面図、(b)は第3変形例に係るバンパビームの断面図、(c)は第4変形例に係るバンパビームの断面図、図14は、第5変形例に係るバンパビームの断面図である。
前記各変形例の効果を、代表的に図13(a)のバンパビームについて説明する。このバンパビームでは、補強板73Bの二つの凸部63aの根元部分の内側にそれぞれ形成された凹部73cが、第4壁2a及び第7壁2cの先端をそれぞれ収容することにより、凸部63aと第4壁2a及び第7壁2cとの剥離(両者の一体化部分すなわち溶接ビード部73Wでの剥離による分解)を抑制し、補強板73Bとビーム本体92とが一体化した状態を、少なくとも、ビーム本体92が座屈変形するまで保つ。これにより、第4壁2aの及び第7壁2cの内側への座屈(第4壁2aの中間部位及び第7壁2cの中間部位が互いに近付く方向に変形する座屈)が抑制される。
図14の変形例による効果について説明する。図14のバンパビームにおいては、補強板83において第4壁2a及び第7壁2c(膨出部2t,2sの外側壁部)によって挟まれる位置に、本体部33bに対して交差する方向に突出する二つの凸部(第3凸部)83bが形成され、これらの凸部83bが、第4壁2a及び第7壁2cの座屈(第4壁2aの中間部位及び第7壁2cの中間部位が互いに近付く方向に変形する座屈)を抑制し、これによりバンパビームの曲げ強度を更に向上させる。
次に、本発明の第7実施形態におけるバンパビーム121について、図15を用いて説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図15は、第7実施形態に係るバンパビーム121の断面図である。以下、上記の実施形態とは異なる部分を中心に説明し、上記の実施形態と同様の事項については、その説明を省略する。
バンパビーム121は、図15に示すように、ビーム本体2と、2枚の補強板(第2補強板)4とを備え、B字形の断面を有する。
次に、第7実施形態における、ヤング率及び密度の関係について説明する。ビーム本体2のヤング率をEst、ビーム本体2の密度をρst、補強板4のヤング率をE3、補強板4の密度をρ3とすると、Est、E3、ρst、及びρ3は、下記の式(6)に示される条件を満たす。
Est/ρst 3 < E3/ρ3 3 ・・・(6)
t3<(ρst/ρ3)×tst ・・・(7)
0.3×tst < t3 ・・・(8)
Pcr ∝ (E・t3)/L2 ・・・(9)
Pcr ∝ E・t3 ・・・(10)
Est・tst 3<E3・t3 3 ・・・(11)
W ∝ ρ・t ・・・(12)
ρst・tst=ρ3・t3 ・・・(13)
Est/ρst 3=4.30×10^(-8) [MPa・m/kg3]
E3/ρ3 3 =3.51×10^(-7) [MPa・m/kg3]
であるから、式(6)が満たされている。
(ρst/ρ3)×tst= 4.08mm > t3(=2.0mm)
であるから、式(7)も満たされている。また、
0.3×tst = 0.42mm < t3(=2.0mm)
であるから、式(8)も満たされている。
次に、座屈荷重の評価結果について説明する。ここでは、図16に示すサンプル10を用いて座屈荷重が算出された。サンプル10は、鋼板12a及びアルミニウム板(アルミニウム系材料からなる板材)13から成り、鋼板12aは、アルミニウム板13によって補強されている。これらアルミニウム板13及び鋼板12aは互いに平行に配置され、その表面同士が密着するように固定されている。
次に、本発明の第8実施形態に係るバンパビーム131について、図18を用いて説明する。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図18は、第8実施形態に係るバンパビーム131の断面図である。以下、上記の実施形態とは異なる部分を中心に説明し、上記の実施形態と同様の事項については、その説明を省略する。
次に、バンパビームにおける曲げ強度の評価結果について説明する。ここでは、4種類のバンパビーム(図15に示したバンパビーム121、図18に示すバンパビーム131、及び、鋼鈑の板厚が互いに異なる2種類のバンパビームであって補強板4を有しないもの(図示せず))について曲げ強度が算出された。具体的には、各バンパビームの中央部(上下方向Aに関する中央部)が、前後方向Bに沿って前方側から後方へ加圧される(図15及び図18の矢印方向参照)という条件下で曲げ強度が算出された。ビーム本体(鋼板)2の板厚、並びに、補強材(アルミニウム系材料からなる板材)の有無、重量比、及び最大曲げモーメント比を表4に示す。
第8実施形態に係るバンパビームは上述した構造に限定されない。その変形例を図20及び図21に示す。なお、上記の実施形態と同様の部分については、図に同一の符号を付してその説明を省略する。図20の(a)は、第8実施形態の第1変形例に係るバンパビーム141の断面図、(b)は(a)に示される円20Bで囲まれた部分の拡大図である。図21は、第8実施形態の第2変形例に係るバンパビーム151の断面図である。以下、上記の第8実施形態とは異なる部分を中心に説明し、上記の第8実施形態と同様の事項については、その説明を省略する。
第7実施形態及び第8実施形態に係るバンパビームの概要について説明する。ここでは、代表的な構造として、図15に示されるバンパビーム121について説明する。このバンパビーム121は、車体の前部に取り付けられ、基準線Wに沿って延びるものであって、鋼製の板材で形成され、基準線Wに沿って延びるビーム本体2と、アルミニウム系材料からなり、基準線Wに沿って延び、前記ビーム本体2に取り付けられた二つの補強板(第2補強板)4と、を有する。
(Est/ρst 3)<(E3/ρ3 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E3:第2補強板のヤング率
ρ3:第2補強板の密度
t3<(ρst/ρ3)×tst
t3:補強板4の板厚
tst:ビーム本体2の板厚
0.3×tst < t3
上記の実施形態は具体例に過ぎず、特に本発明を限定するものではない。本発明の具体的構成については、設計変更が可能である。また、上記の実施形態に記載された作用及び効果は、上記の実施形態から生じる最も好適な作用及び効果を列挙したに過ぎず、本発明による作用及び効果は、上記の実施形態に記載されたものに限定されるものではない。
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E2:第1補強板のヤング率
ρ2:第1補強板の密度
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E3:第2補強板のヤング率
ρ3:第2補強板の密度
t3<(ρst/ρ3)×tst
tst:ビーム本体の板厚
t3:第2補強板の板厚
0.3×tst < t3
(b)前記第3壁は、前記第2壁の、前記第1壁とは反対側の端部から、前記第2壁と交差する方向に、且つ、前記第2壁に対して前記第1壁とは反対側に延びる。
(c)前記第4壁は、前記第3壁の、前記第2壁とは反対側の端部から、前記第3壁と交差する方向に、且つ、前記第3壁に対して前記第2壁の側に延びる。
(d)前記第5壁は、前記第1壁の他端から、前記第1壁と交差する方向に、且つ、前記第1壁に対して前記第2壁と同じ側に延びる。
(e)前記第6壁は、前記第5壁の、前記第1壁とは反対側の端部から、前記第5壁と交差する方向に、且つ、前記第5壁に対して前記第1壁とは反対側に延びる。
(f)前記第7壁は、前記第6壁の、前記第5壁とは反対側の端部から、前記第6壁と交差する方向に、且つ、前記第6壁に対して前記第5壁の側に延びる。
(g)前記補強板は、前記第1壁が延びる方向に延びており、且つ、前記第1壁に垂直な方向に関して、前記ビーム本体の、前記第3壁及び前記第6壁とは反対側の端部に対して取り付けられる。
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E2:補強板のヤング率
ρ2:補強板の密度
(b)前記第3壁は、前記第2壁の、前記第1壁とは反対側の端部から、前記第2壁と交差する方向に、且つ、前記第2壁に対して前記第1壁とは反対側に延びる。
(c)前記第4壁は、前記第3壁の、前記第2壁とは反対側の端部から、前記第3壁と交差する方向に、且つ、前記第3壁に対して前記第2壁の側に延びる。
(d)前記第5壁は、前記第1壁の他端から、前記第1壁と交差する方向に、且つ、前記第1壁に対して前記第2壁と同じ側に延びる。
(e)前記第6壁は、前記第5壁の、前記第1壁とは反対側の端部から、前記第5壁と交差する方向に、且つ、前記第5壁に対して前記第1壁とは反対側に延びる。
(f)前記第7壁は、前記第6壁の、前記第5壁とは反対側の端部から、前記第6壁と交差する方向に、且つ、前記第6壁に対して前記第5壁の側に延びる。
(g)前記第8壁は、前記第4壁の、前記第3壁とは反対側の端部と、前記第7壁の、前記第6壁とは反対側の端部とを結び、且つ、前記第1壁が延びる方向に延び、前記第2補強板は、前記第2壁、前記第4壁、前記第5壁及び前記第7壁のうち少なくとも一つに対して、これらと平行に取り付けられる。
(Est/ρst 3)<(E3/ρ3 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E3:第2補強板のヤング率
ρ3:第2補強板の密度
Claims (13)
- 車体の前部又は後部に取り付けられ、基準線に沿って延びるバンパビームであって、
金属製の板材からなり前記基準線に沿って延びるビーム本体と、
前記基準線に沿って延び、前記ビーム本体に取り付けられた金属製の第1補強板とを備え、
前記基準線に垂直な少なくとも一つの断面において、前記第1補強板は線状に延び、前記ビーム本体は、内部空間を囲みながら前記第1補強板からこれと交差する方向へ膨出する一対の膨出部とを含み、
前記ビーム本体及び前記第1補強板は下記の条件を満たす、バンパビーム。
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E2:第1補強板のヤング率
ρ2:第1補強板の密度 - 前記基準線に垂直な少なくとも一つの断面において、前記各膨出部が、前記第1補強板に対して交差する方向に延びる外側壁部と、この外側壁部よりも他の膨出部に近い位置で前記第1補強板に対して交差する方向に延びる内側壁部とを有し、これらの外側壁部及び内側壁部が前記第1補強板に沿って並べて配置される、バンパビーム。
- 前記第1補強板に、この第1補強板からその長手方向に対して交差する方向に突出して両内側壁部を外側から挟む第1凸部が設けられる、請求項2に記載のバンパビーム。
- 前記第1補強板に、この第1補強板からその長手方向に対して交差する方向に突出して両外側壁部を外側から挟む第2凸部が設けられる、請求項2又は3に記載のバンパビーム。
- 前記各外側壁部が、それぞれに対応する第2凸部に固定されている、請求項4に記載のバンパビーム。
- 前記第1補強板のうち前記各第2凸部の根元部分の内側の位置に、対応する外側壁部の先端を収容するための凹部がそれぞれ形成されている、請求項5に記載のバンパビーム。
- 前記第1補強板に、この第1補強板からその長手方向に対して交差する方向に突出して両外側壁部を内側から拘束する第3凸部が設けられ、各第3凸部にこれに対応する外側壁部が固定される、請求項2~6のいずれかに記載のバンパビーム。
- 前記第1補強板のうち前記各第3凸部の根元部分の外側の位置に、対応する外側壁部の先端を収容するための凹部がそれぞれ形成されている、請求項7記載のバンパビーム。
- 前記第1補強板の材料が、アルミニウムまたはアルミニウム合金である、請求項1~8のいずれかに記載のバンパビーム。
- 車体の前部又は後部に取り付けられ、基準線に沿って延びるバンパビームであって、
金属製の板材からなり前記基準線に沿って延びるビーム本体と、
前記基準線に沿って延び、前記ビーム本体に取り付けられた金属製の第2補強板とを備え、
前記基準線に垂直な少なくとも一つの断面において、前記ビーム本体は、線状に延びる基準壁と、内部空間を囲みながら前記基準壁からこれと交差する方向へ膨出する一対の膨出部とを含み、各膨出部は、前記基準壁に対して交差する方向に延びる外側壁部と、この外側壁部よりも他の膨出部に近い位置で前記第1補強板に対して交差する方向に延びる内側壁部とを有し、各外側壁部及び各内側壁部が前記基準壁に沿って並べて配置され、
前記第2補強板は、両外側壁部および両内側壁部のうちの少なくとも一つにこれと平行な姿勢で取付けられ、
前記ビーム本体及び前記第2補強板は下記の条件を満たす、バンパビーム。
(Est/ρst 3)<(E2/ρ2 3)
Est:ビーム本体のヤング率
ρst:ビーム本体の密度
E3:第2補強板のヤング率
ρ3:第2補強板の密度 - さらに下記の条件を満たす、請求項10に記載のバンパビーム。
t3<(ρst/ρ3)×tst
t3:第2補強板の板厚
tst:ビーム本体の板厚 - さらに下記の条件を満たす、請求項10又は11に記載のバンパビーム。
0.3×tst < t3
t3:第2補強板の板厚
tst:ビーム本体の板厚 - 前記第2補強板の材料が、アルミニウムまたはアルミニウム合金である、請求項10~12のいずれかに記載のバンパビーム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020107021282A KR101166641B1 (ko) | 2008-02-27 | 2009-02-25 | 범퍼 빔 |
EP20090716185 EP2261086B1 (en) | 2008-02-27 | 2009-02-25 | Bumper beam |
US12/735,888 US8668234B2 (en) | 2008-02-27 | 2009-02-25 | Bumper beam |
CN2009801082970A CN101965277B (zh) | 2008-02-27 | 2009-02-25 | 保险杠梁 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-045913 | 2008-02-27 | ||
JP2008045913 | 2008-02-27 | ||
JP2008-081061 | 2008-03-26 | ||
JP2008081061 | 2008-03-26 | ||
JP2009-009537 | 2009-01-20 | ||
JP2009009537A JP4324240B1 (ja) | 2008-02-27 | 2009-01-20 | バンパー構造 |
Publications (1)
Publication Number | Publication Date |
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WO2009107670A1 true WO2009107670A1 (ja) | 2009-09-03 |
Family
ID=41016057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/053423 WO2009107670A1 (ja) | 2008-02-27 | 2009-02-25 | バンパビーム |
Country Status (6)
Country | Link |
---|---|
US (1) | US8668234B2 (ja) |
EP (1) | EP2261086B1 (ja) |
JP (1) | JP4324240B1 (ja) |
KR (1) | KR101166641B1 (ja) |
CN (1) | CN101965277B (ja) |
WO (1) | WO2009107670A1 (ja) |
Cited By (2)
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WO2011125223A1 (ja) * | 2010-04-09 | 2011-10-13 | トヨタ自動車株式会社 | バンパリインフォースメント構造 |
WO2022137751A1 (ja) * | 2020-12-25 | 2022-06-30 | ダイムラー・アクチェンゲゼルシャフト | アンダーランプロテクタ |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5420462B2 (ja) | 2010-03-30 | 2014-02-19 | 株式会社神戸製鋼所 | 自動車用部品 |
JP5299581B2 (ja) * | 2011-03-25 | 2013-09-25 | トヨタ自動車株式会社 | 車両端部構造 |
US9327592B2 (en) * | 2014-03-20 | 2016-05-03 | GM Global Technology Operations LLC | Bumper with integrated auxilliary cooler |
KR102042642B1 (ko) * | 2015-07-08 | 2019-11-08 | 닛폰세이테츠 가부시키가이샤 | 범퍼 리인포스먼트 및 그것을 구비한 차량 |
JP6734232B2 (ja) * | 2017-03-17 | 2020-08-05 | 株式会社神戸製鋼所 | 部材の接合方法および接合体 |
US10308199B2 (en) * | 2017-10-05 | 2019-06-04 | Ford Global Technologies, Llc | Vehicle and vehicle bumper |
KR102497030B1 (ko) * | 2018-05-17 | 2023-02-07 | 현대자동차주식회사 | 충방전 기능을 갖는 차량용 백빔 및 그 제조방법과 이를 사용한 차량의 운용 시스템 |
JP7205404B2 (ja) * | 2019-06-28 | 2023-01-17 | トヨタ自動車株式会社 | 車両構造 |
WO2024009908A1 (ja) * | 2022-07-08 | 2024-01-11 | 株式会社レゾナック | 自動車構造材の製造方法 |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1081182A (ja) * | 1996-09-09 | 1998-03-31 | Toyota Motor Corp | バンパリインフォース |
JPH1159296A (ja) | 1997-08-13 | 1999-03-02 | Kobe Steel Ltd | 自動車用バンパーリーンフォースメント |
JPH11334500A (ja) | 1998-05-29 | 1999-12-07 | Toyota Motor Corp | 自動車のバンパの支持構造 |
JP2000052897A (ja) | 1998-08-05 | 2000-02-22 | Nippon Light Metal Co Ltd | バンパー構造 |
JP2003129611A (ja) | 2001-08-01 | 2003-05-08 | Kobe Steel Ltd | 曲げ強度部材 |
JP2003312404A (ja) | 2002-04-24 | 2003-11-06 | Press Kogyo Co Ltd | 車両の複合構造部材 |
JP2004148915A (ja) | 2002-10-29 | 2004-05-27 | Aisin Seiki Co Ltd | 車両用バンパ装置 |
JP2005008146A (ja) | 2003-06-19 | 2005-01-13 | Hyundai Motor Co Ltd | 自動車用バンパーのバックビーム構造 |
JP2005088651A (ja) | 2003-09-12 | 2005-04-07 | Honda Motor Co Ltd | 充填構造体 |
JP2006218904A (ja) | 2005-02-08 | 2006-08-24 | Fuji Heavy Ind Ltd | バンパメインビーム |
JP2006232198A (ja) * | 2005-02-28 | 2006-09-07 | Mitsubishi Alum Co Ltd | 車両用衝撃吸収部材 |
JP2006248336A (ja) | 2005-03-09 | 2006-09-21 | Nissan Motor Co Ltd | 車体構造部材およびそれを用いた車両 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3779592A (en) * | 1972-06-01 | 1973-12-18 | Rockwell International Corp | High strength vehicle bumper |
US5154462A (en) * | 1991-12-23 | 1992-10-13 | Ford Motor Company | Method for making a bonded vehicular cross member bumper beam from two materials |
JP2003237507A (ja) * | 2002-02-19 | 2003-08-27 | Om Kogyo Kk | バンパ補強材 |
ATE342828T1 (de) * | 2002-11-28 | 2006-11-15 | Bekaert Sa Nv | Stossfänger mit länglichen metallelementen |
US6923482B2 (en) * | 2003-06-27 | 2005-08-02 | Magna International Inc. | Multiple material bumper beam |
US6971691B1 (en) * | 2004-06-25 | 2005-12-06 | Shape Corporation | Vehicle bumper beam |
CN1834345A (zh) * | 2005-03-18 | 2006-09-20 | 天津金证造纸有限公司 | 新型壁纸原纸及其制造方法 |
CN201021235Y (zh) * | 2006-12-29 | 2008-02-13 | 比亚迪股份有限公司 | 一种汽车前防撞梁 |
-
2009
- 2009-01-20 JP JP2009009537A patent/JP4324240B1/ja not_active Expired - Fee Related
- 2009-02-25 KR KR1020107021282A patent/KR101166641B1/ko active IP Right Grant
- 2009-02-25 EP EP20090716185 patent/EP2261086B1/en not_active Not-in-force
- 2009-02-25 US US12/735,888 patent/US8668234B2/en not_active Expired - Fee Related
- 2009-02-25 WO PCT/JP2009/053423 patent/WO2009107670A1/ja active Application Filing
- 2009-02-25 CN CN2009801082970A patent/CN101965277B/zh not_active Expired - Fee Related
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1081182A (ja) * | 1996-09-09 | 1998-03-31 | Toyota Motor Corp | バンパリインフォース |
JPH1159296A (ja) | 1997-08-13 | 1999-03-02 | Kobe Steel Ltd | 自動車用バンパーリーンフォースメント |
JPH11334500A (ja) | 1998-05-29 | 1999-12-07 | Toyota Motor Corp | 自動車のバンパの支持構造 |
JP2000052897A (ja) | 1998-08-05 | 2000-02-22 | Nippon Light Metal Co Ltd | バンパー構造 |
JP2003129611A (ja) | 2001-08-01 | 2003-05-08 | Kobe Steel Ltd | 曲げ強度部材 |
JP2003312404A (ja) | 2002-04-24 | 2003-11-06 | Press Kogyo Co Ltd | 車両の複合構造部材 |
JP2004148915A (ja) | 2002-10-29 | 2004-05-27 | Aisin Seiki Co Ltd | 車両用バンパ装置 |
JP2005008146A (ja) | 2003-06-19 | 2005-01-13 | Hyundai Motor Co Ltd | 自動車用バンパーのバックビーム構造 |
JP2005088651A (ja) | 2003-09-12 | 2005-04-07 | Honda Motor Co Ltd | 充填構造体 |
JP2006218904A (ja) | 2005-02-08 | 2006-08-24 | Fuji Heavy Ind Ltd | バンパメインビーム |
JP2006232198A (ja) * | 2005-02-28 | 2006-09-07 | Mitsubishi Alum Co Ltd | 車両用衝撃吸収部材 |
JP2006248336A (ja) | 2005-03-09 | 2006-09-21 | Nissan Motor Co Ltd | 車体構造部材およびそれを用いた車両 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2261086A4 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011125223A1 (ja) * | 2010-04-09 | 2011-10-13 | トヨタ自動車株式会社 | バンパリインフォースメント構造 |
JP5387759B2 (ja) * | 2010-04-09 | 2014-01-15 | トヨタ自動車株式会社 | バンパリインフォースメント構造 |
US8967687B2 (en) | 2010-04-09 | 2015-03-03 | Toyota Jidosha Kabushiki Kaisha | Bumper reinforcement structure |
WO2022137751A1 (ja) * | 2020-12-25 | 2022-06-30 | ダイムラー・アクチェンゲゼルシャフト | アンダーランプロテクタ |
JP2022102082A (ja) * | 2020-12-25 | 2022-07-07 | メルセデス・ベンツ グループ アクチェンゲゼルシャフト | アンダーランプロテクタ |
JP7422653B2 (ja) | 2020-12-25 | 2024-01-26 | メルセデス・ベンツ グループ アクチェンゲゼルシャフト | アンダーランプロテクタ |
Also Published As
Publication number | Publication date |
---|---|
KR101166641B1 (ko) | 2012-07-18 |
JP4324240B1 (ja) | 2009-09-02 |
CN101965277A (zh) | 2011-02-02 |
KR20100115812A (ko) | 2010-10-28 |
JP2009255900A (ja) | 2009-11-05 |
CN101965277B (zh) | 2012-08-29 |
US8668234B2 (en) | 2014-03-11 |
EP2261086B1 (en) | 2015-04-29 |
EP2261086A1 (en) | 2010-12-15 |
EP2261086A4 (en) | 2012-03-14 |
US20130181463A1 (en) | 2013-07-18 |
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