WO2012153792A1 - Energy absorption member - Google Patents

Energy absorption member Download PDF

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Publication number
WO2012153792A1
WO2012153792A1 PCT/JP2012/061940 JP2012061940W WO2012153792A1 WO 2012153792 A1 WO2012153792 A1 WO 2012153792A1 JP 2012061940 W JP2012061940 W JP 2012061940W WO 2012153792 A1 WO2012153792 A1 WO 2012153792A1
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WO
WIPO (PCT)
Prior art keywords
absorbing member
energy absorbing
bulging portion
energy
energy absorption
Prior art date
Application number
PCT/JP2012/061940
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French (fr)
Japanese (ja)
Inventor
行 須永
Original Assignee
株式会社深井製作所
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Filing date
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Application filed by 株式会社深井製作所 filed Critical 株式会社深井製作所
Publication of WO2012153792A1 publication Critical patent/WO2012153792A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • 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
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type

Definitions

  • the present invention relates to an energy absorbing member such as a component part of an automobile bumper.
  • the car is provided with a mechanism for absorbing impact energy transmitted from the outside to the body in the event of a collision.
  • an energy absorbing member is disposed at the front end of the front side member of the automobile and the bumper stay.
  • the energy absorbing member is formed using, for example, aluminum, steel or the like so that the outer shape is a square cylinder. And this energy absorption member is arrange
  • the energy absorbing member absorbs the impact energy at the time of collision by being buckled and deformed by a force applied in the axial direction of the square cylinder (that is, by contracting and deforming in the axial direction).
  • the energy absorbing member is desirably buckled and deformed without being bent at the time of collision. This is because if the energy absorbing member is bent, the impact energy absorption efficiency is deteriorated.
  • the energy absorbing member is required to have a sufficient axial resistance (that is, a sufficient reaction force against buckling deformation).
  • the axial drag changes according to conditions such as plate thickness and material.
  • the energy absorbing member is required to have a sufficiently low axial drag at the beginning of the collision and a sufficiently large impact energy absorption amount.
  • Patent Document 1 As a conventional energy absorbing member, for example, one described in Patent Document 1 below is known.
  • the energy absorbing member of Patent Document 1 has a structure in which a rib is provided on the outer periphery of a square tube, and is formed so that the cross-sectional area of the connection portion between the outer periphery and the rib is small.
  • the technique of patent document 1 aims at reduction of the maximum load (that is, reduction of the axial drag at the initial stage of the collision) and increase of the amount of energy absorption.
  • Patent Document 1 is insufficient to sufficiently absorb the impact at the time of a car collision or the like.
  • An object of the present invention is to provide an energy absorbing member having a sufficiently small axial drag at the initial stage of impact and a sufficiently large impact energy absorption amount at a low cost.
  • An energy absorbing member according to the present invention has a cylindrical outer shape, and is an energy absorbing member that absorbs impact energy applied in the axial direction by buckling in the axial direction of the cylinder, and is provided on a side surface of the cylinder.
  • the plurality of bulging portions are formed adjacent to or close to each other, and the bulging portions protrude toward the inside of the cylinder.
  • the bulging portion can be formed so that the outer shape is substantially polygonal when viewed from the front.
  • the bulging portion is formed so that the outer edge shape is rectangular in a front view, a ridge line is formed along one diagonal line, and a valley line is formed along the other diagonal line. Can do.
  • the bulging portion may be formed so that the outer shape is substantially circular when viewed from the front.
  • the absorption amount of the impact energy applied in the axial direction is different for each of the areas. Can be set.
  • the bulging portion can be formed adjacent to the entire side surface without a gap.
  • the energy absorbing member of the present invention can be disposed between a vehicle body strength member of an automobile and a bumper reinforcing member along the vehicle width direction.
  • the axial resistance and deformation mode against buckling can be changed depending on the shape and size of the bulging portion. It becomes possible to adjust, and the bending of the energy absorbing member can be prevented. Furthermore, since the bulging part protrudes inward of the cylinder, when the energy absorbing member is buckled, the impact energy is increased with high energy absorption efficiency due to the interference reaction force effect between the adjacent bulging parts. Can be absorbed. Therefore, according to the present invention, it is possible to provide an energy absorbing member having a sufficiently small axial drag at the initial stage of collision and a sufficiently large impact energy absorption amount.
  • the outer shape of the bulging portion into a substantially polygonal shape when viewed from the front, it is possible to increase the resistance to an impact applied from the outside in a direction perpendicular to the side surface of the energy absorbing member. Further, when the energy absorbing member is buckled, bending in the axial direction is less likely to occur.
  • the outer edge shape of the bulging portion is formed in a rectangular shape in front view, a ridge line is formed along one diagonal line, and a valley line is formed along the other diagonal line, whereby each diagonal line of the energy absorbing member is formed.
  • the resistance to external impact applied in the direction can be increased. Thereby, a small-sized energy absorption member with high energy absorption efficiency can be formed easily.
  • the outer shape of the bulging portion into a substantially circular shape when viewed from the front, it is possible to increase the resistance to an impact applied from multiple external directions. Thereby, an energy absorption member with high energy absorption efficiency can be formed easily.
  • the axial resistance against buckling and the mode of deformation can be made different for each of these areas. This makes it easier to increase the total amount of shock energy absorption while reducing the axial drag at the beginning of the collision.
  • the bulging portions adjacent to each other across the entire side surface of the energy absorbing member without any gap, it is further easier to increase the total amount of impact energy absorption while reducing the axial drag at the beginning of the collision.
  • the energy absorbing member of the present invention By disposing the energy absorbing member of the present invention between the vehicle body strength member of the automobile and the bumper reinforcing member along the vehicle width direction, the energy absorbing member can effectively absorb the impact force acting on the bumper at the time of the vehicle collision. Thereby, the impact force transmitted to the vehicle body strength member can be reduced.
  • FIG. 3 is a BB end view of FIG. 2.
  • FIG. 3 is a CC end view of FIG. 2.
  • 4 is a graph showing experimental results of energy absorption characteristics of the energy absorbing member according to Embodiment 1.
  • 4 is a graph showing experimental results of energy absorption characteristics of the energy absorbing member according to Embodiment 1.
  • It is a conceptual diagram which shows the principal part structure of the motor vehicle to which the energy absorption member of Embodiment 1 is applied.
  • It is a conceptual diagram which shows the whole structure of the energy absorption member which concerns on Embodiment 2.
  • FIG. It is an enlarged view of the part D of FIG.
  • FIG. 10 is an EE end view of FIG. 9.
  • FIG. 10 is a FF end view of FIG. 9.
  • 6 is a conceptual plan view showing an overall structure of an energy absorbing member according to Embodiment 4.
  • FIG. 6 is a conceptual plan view showing an overall structure of an energy absorbing member according to Embodiment 4.
  • FIG. 6 is a conceptual plan view showing an overall structure of an energy absorbing member according to Embodiment 4.
  • FIG. It is the elements on larger scale of FIG. 12A.
  • FIG. 14 is a GG end view of FIG. 13. It is a graph which shows the experimental result of the energy absorption characteristic of the energy absorption member which concerns on Embodiment 4.
  • FIG. It is a top view which shows notionally the whole structure of the energy absorption member which concerns on Embodiment 5.
  • FIG. is HH sectional drawing of FIG. 16A.
  • FIG. 17A shows notionally the whole structure of the energy absorption member which concerns on Embodiment 6.
  • the energy absorbing member 11 (see FIG. 1) of the first embodiment is used for absorbing the impact of the bumper of the automobile 100.
  • the automobile 100 includes a side member 102 (corresponding to the “body strength member” of the present invention) that extends in the vehicle front-rear direction below the side of the engine room 101, and the interior of the bumper skin 103. Further, a bumper reinforcing member 104 extending along the vehicle width direction is provided. An energy absorbing member 11 is disposed between the side member 102 and the bumper skin 103 substantially parallel to the vehicle front-rear direction.
  • the energy absorbing member 11 is provided between the front side member 102 and the bumper reinforcing member 104 of the automobile 100.
  • the energy absorbing member 11 is a rear side member (see FIG. 7). (Not shown) and a bumper reinforcing member (not shown) may be provided.
  • the energy absorbing member 11 is formed of a metal plate that has high rigidity and can absorb kinetic energy applied from the outside by plastic deformation.
  • the energy absorbing member 11 is formed of a single aluminum plate having a thickness of about 1.8 millimeters.
  • the energy absorbing member 11 can be formed of any material as long as it has good rigidity and kinetic energy absorption characteristics.
  • it can also be formed of a metal other than aluminum, such as a steel plate, an aluminized steel plate, a laminate of an aluminum plate and a resin film material, a resin, and a plywood thereof.
  • the energy absorbing member 11 according to the first embodiment is formed by pressing, it may be formed by any other processing method.
  • the energy absorbing member 11 is formed in a cylindrical shape as shown in FIG.
  • the energy absorbing member 11 is hollow and has openings 12 and 12 at both ends.
  • the energy absorbing member 11 is fixed to the side member 102 and the bumper reinforcing member 104 with a bolt or the like (not shown). Thereby, the energy absorbing member 11 is disposed so that the virtual axis 17 (the central axis of the cylinder formed by the energy absorbing member 11) is parallel to the front-rear direction of the automobile 100.
  • the energy absorbing member 11 is not limited to a cylindrical shape, and has a polygonal cylindrical shape such as a rectangular cylindrical shape, a pentagonal cylindrical shape, and a hexagonal cylindrical shape in a plan view (that is, viewed from the opening side). There may be.
  • the inside of the energy absorbing member 11 may be partitioned by a partition member extending in the axial direction. Further, the energy absorbing member 11 may be fixed to the side member 102 and the bumper reinforcing member 104 by any method.
  • the overall structure of the energy absorbing member 11 is not limited to the above as long as the rigidity and impact energy absorption characteristics are good.
  • a structure in which plate materials are provided at both ends and the internal space is sealed may be used, or a material such as urethane may be filled therein.
  • a plurality of bulging portions 13 are formed on substantially the entire plate surface of the energy absorbing member 11 by, for example, pressing.
  • the bulging portion 13 of the energy absorbing member is polygonal when viewed from the front.
  • all the bulging portions 13 are formed in the same shape. That is, each bulging part 13 is the same hexagonal outer shape in front view, and the size of the bulging is the same.
  • each bulging portion 13 bulges inward from the virtual outer surface 18 of the energy absorbing member 11.
  • a ridge line 14 that is inclined toward the inner side of the energy absorbing member 11 is formed as shown in FIGS. 3 and 4.
  • the ridge line 14 is a ridge line when viewed from the inside of the energy absorbing member 11, but is a valley line when viewed from the outside. As shown in FIGS. 3 and 4, these ridge lines 14 form a curve that curves inward, and the intersection 15 of the ridge lines 14 is the highest point in the bulging direction.
  • a surface surrounded by the two ridge lines 14 and 14 of the bulging portion 13 and one side 16 of the outer shape forms a plane. All the adjacent bulging portions 13 are adjacent to each other without a gap.
  • the bulging portion 13 is formed in a shape that allows good absorption of kinetic energy due to an impact received when the automobile 100 collides.
  • the bulging portion 13 is formed so that one side of the outer shape is 8 millimeters and the height is 2 millimeters.
  • the bulging portion 13 may be formed in any shape or size as long as energy absorption is good.
  • the bulging portion 13 is disposed in such a manner that the cylindrical axial direction is not easily bent. Specifically, the bulging part 13 is arrange
  • the impact load When an impact load is applied to the bumper skin 103 from the front of the automobile 100, the impact load is transmitted to the energy absorbing member 11 via the bumper reinforcing member 104. At this time, the energy absorbing member 11 is buckled in the direction of the virtual axis 17 because the buckling load is set smaller than that of the side member 102. Thereby, transmission of the load to the side member 102 can be suppressed.
  • the bulging portion 13 is provided in the energy absorbing member 11, the axial drag at the initial stage of the collision can be reduced. Moreover, since the outer peripheral part of the bulging part 13 becomes a reference position at the time of buckling, the energy absorption characteristic can be adjusted by adjusting the size, arrangement position, and the like of the bulging part 13. That is, in the energy absorbing member 11 of the first embodiment, unlike the energy absorbing member having a flat side surface, the energy absorbing characteristics are adjusted without changing the wall length, plate thickness, and material. Can do.
  • the bulging portion 13 is provided on substantially the entire surface of the energy absorbing member 11, high energy absorption efficiency can be obtained on the entire surface of the energy absorbing member 11. Therefore, in this Embodiment 1, when the energy absorption member 11 buckles, it can suppress bending in the direction non-parallel to the virtual axis
  • the bulging portion 13 protrudes inward of the energy absorbing member 11. Therefore, when the energy absorbing member 11 is buckled, an interference reaction force effect occurs between the adjacent bulging portions 13 and 13. And the effect which absorbs an impact can be heightened by this interference reaction force effect. As a result, the energy absorbing member 11 can absorb an impact with high energy absorption efficiency.
  • FIG. 5 and FIG. 6 show the results of an experiment relating to the impact energy absorbed by the energy absorbing member 11.
  • the vertical axis represents the reaction force (unit: kilonewtons), and the vertical axis represents the stroke (unit: millimeters).
  • the vertical axis represents absorbed energy (unit: kilojoule), and the horizontal axis represents stroke (unit: millimeter).
  • a curve 110 indicates that one end of the energy absorbing member 11 of the first embodiment is attached to the fixing member, and a 500 kg rigid body is freely dropped from a height of 3 m from the other end side, and the initial speed is 27.6 km.
  • the state of change in reaction force and change in absorbed energy when the shaft is crushed at / h is shown.
  • the energy absorbing member 11 used in the experiment is formed of a steel material of SPC440W / 1.0t (YP: 355 MPa, TS: 483 MPa, El: 33%).
  • the energy absorbing member 11 has a diameter of 105 mm.
  • Numeral 120 is a characteristic curve showing an experimental result of an energy absorbing member (not shown) as a first comparative example.
  • the first comparative example is different in that the material, shape, and diameter of the energy absorbing member are the same as those of the energy absorbing member 11 of the first embodiment, but are formed of a flat plate without the bulging portion 13.
  • Numeral 130 is a characteristic curve showing an experimental result of an energy absorbing member (not shown) as a second comparative example.
  • the material, shape, diameter, size and arrangement of the bulging part of the energy absorbing member are the same as those of the energy absorbing member 11 of the first embodiment, but the bulging part is formed in a cylindrical outer side. The point which was formed so that it may protrude toward it differs.
  • Numeral 140 is a characteristic curve showing an experimental result of an energy absorbing member (not shown) as a third comparative example.
  • the third comparative example is the second comparative example in that the material of the energy absorbing member, the shape, the size and arrangement of the bulging portion, and the bulging portion are formed so as to protrude outward in the cylindrical shape. This is the same as the energy absorbing member 11 except that the diameter is 100 mm, which is different from the second comparative example.
  • the experimental method for the first to third comparative examples is the same as the experimental method for the energy absorbing member 11 of the first embodiment.
  • the initial reaction force peak (position indicated by reference numeral 111) when the energy absorbing member 11 of the first embodiment buckles is the initial reaction force peak (reference numeral 111) of the second comparative example. It is approximately 80 f / kN, similar to the position indicated by 131). This is lower than about 130 f / kN of the peak of the initial reaction force (position indicated by reference numeral 121) in the first comparative example.
  • the total energy absorption amount of each energy absorbing member (that is, the total amount of impact energy absorbed by the energy absorbing member from the start to the end of buckling) is the portion between each graph and the horizontal axis. Equal to the area.
  • the total absorbed energy of the energy absorbing member 11 of the first embodiment is substantially equal to the total absorbed energy of the first comparative example and the third comparative example. This is larger than the total absorbed energy of the second comparative example.
  • the energy absorbing member 11 of the first embodiment is substantially equivalent to the first comparative example (that is, the energy absorbing member formed of a flat plate having no bulging portion). Although it has a collision energy absorption amount, a further feature is that the peak value of the initial load is remarkably low, and a stable reaction force can be maintained over the entire stroke even after the initial load.
  • the energy absorbing member of the second comparative example is the first embodiment in that the peak value of the initial load is low and the stability of the reaction force in the stroke after the initial load. The tendency similar to that of the energy absorbing member 11 is shown. However, as shown in FIG. 6, the energy absorbing member of the second comparative example is clearly inferior to the energy absorbing member 11 according to the first embodiment in terms of the total absorbed energy.
  • the energy absorbing member 11 according to the first embodiment suppresses the peak value of the initial load when the bulging portion 13 protrudes toward the inner side of the cylinder, thereby buckling.
  • the impact can be absorbed with high energy absorption efficiency equivalent to that of the energy absorbing member in which the bulging portion is not formed due to the interference reaction force effect between the bulging portions 13 and 13 adjacent to each other.
  • the peak value of the initial load is suppressed, the obstacle value applied to the occupant is reduced, the energy is small, the energy absorption efficiency is high, and the degree of energy absorption can be freely adjusted.
  • the absorbing member 11 can be formed.
  • the energy absorbing member 21 according to the second embodiment of the present invention is also used for shock absorption of the bumper of the automobile 100 shown in FIG.
  • the shape of the bulging portion 22 is different from that of the bulging portion 13 according to the energy absorbing member 11 of the first embodiment.
  • the bulging portion 22 of the second embodiment is formed over substantially the entire surface of the energy absorbing member 21.
  • the bulging portion 22 is formed by, for example, pressing.
  • the bulging portion 22 bulges inward from a virtual outer surface 28 indicated by a two-dot chain line in the drawings of the energy absorbing member 21 in FIGS. 10 and 11.
  • each bulging portion 22 is a substantially rectangular shape (see the outer circumferential line 23 in FIG. 9).
  • the bulging portions 22 are arranged so that the respective diagonal lines are along the axial direction and the circumferential direction of the energy absorbing member 21.
  • the bulging portion 22 bulges from the outer peripheral line 23 to the inside of the energy absorbing member 21, and the size of the bulging is the same.
  • a first ridge line 24 is provided on a diagonal line of the bulging portion 22 along the circumferential direction of the energy absorbing member 21 (that is, in the left-right direction in FIG. 9).
  • a trough line 26 is provided on the bulging portion 22 on a diagonal line along the axial direction of the energy absorbing member 21 (that is, in the left-right direction in FIG. 9).
  • a pair of second ridge lines 25 and 25 are provided on both sides of the valley line 26. As shown in FIG. 9, the second ridge lines 25, 25 have a rhombus shape in front view. One end of the first ridge line 24 is joined to the approximate center of the second ridge lines 25 and 25. Further, both end portions of the second ridge lines 25 and 25 and both end portions of the valley line 26 are separated from the outer peripheral line 23.
  • the first ridge line 24 and the second ridge line 25 are ridge lines when viewed from the inside of the energy absorbing member 21, but are valley lines when viewed from the outside.
  • the valley line 26 is a valley line when viewed from the inside of the energy absorbing member 21, but becomes a ridge line when viewed from the outside.
  • the distance L1 between the valley line 26 and the virtual axis 17 of the energy absorbing member 21 shown in FIG. 10 is set to be longer than the distance L2 between the outer peripheral line 23 and the virtual axis 17.
  • the energy absorbing member 21 of the second embodiment can absorb an impact with high energy absorption efficiency when the plate-like member is buckled by providing the bulging portion 22 having a substantially rectangular outer edge shape. Further, the bulging portion 22 has a first ridge line 24 formed along one diagonal line and a valley line along the other diagonal line in addition to the outer edge shape being formed in a substantially rectangular shape in front view. Since 26 is formed, it is possible to increase the resistance to an impact applied from the outside toward each diagonal direction of the energy absorbing member.
  • the outer peripheral line 23 and the first ridge line 24 of the bulging portion 22 serve as reference positions for buckling, and the function as a “tension” in which the valley line 26 exerts a drag in the buckling direction. Fulfill. Therefore, the energy absorbing member 21 according to the second embodiment can adjust the axial resistance and the deformation mode against buckling without changing the wall length, the plate thickness, and the material, and the energy absorbing member 21 Strength can be increased. Thereby, in this Embodiment 2, the energy absorption member 21 which is small, has high energy absorption efficiency, and can adjust the degree of energy absorption freely can be obtained.
  • both end portions of the second ridge lines 25 and 25 and both end portions of the valley line 26 are formed apart from the outer peripheral line 23.
  • both end portions of the second ridge lines 25 and 25 and You may form so that the both ends of the valley line 26 may join to the outer periphery line 23.
  • a ridgeline (1st ridgeline 24) is provided on the diagonal along the circumferential direction of the energy absorption member 21 of the bulging part 22, and on the diagonal along the axial direction of the energy absorption member 21
  • the valley line 26 is provided, but conversely, the valley line may be provided on the diagonal line along the circumferential direction of the energy absorbing member 21 and the ridge line may be provided on the diagonal line along the axial direction.
  • the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the inside is filled with urethane or the like
  • the point etc. which may provide a material are the same as that of the said Embodiment 1.
  • Embodiment 3 of the present invention is also used to absorb the impact of the bumper of automobile 100 (see FIG. 7).
  • This energy absorbing member (not shown) is different from the bulging portions 13 and 22 of the energy absorbing members 11 and 21 of the first and second embodiments in the shape of the bulging portion (not shown). Specifically, the bulging portion (not shown) of the third embodiment is formed so as to be circular in plan view. The rest is the same as in the first and second embodiments.
  • the shape of the bulging portion may be elliptical in plan view.
  • the energy absorbing member may be polygonal, the partition member may be provided inside, the plate material may be provided at both ends and sealed, and the inside is filled with urethane or the like
  • the point etc. which may provide a material are the same as that of the said Embodiment 1.
  • the energy absorbing member 41 according to the fourth embodiment of the present invention is also used for shock absorption of the bumper of the automobile 100 (see FIG. 7).
  • FIG. 12A is a side view conceptually showing the structure of the energy absorbing member 41 according to the fourth embodiment. 13 is a partially enlarged view of FIG. 12A, and FIG. 14 is a cross-sectional view taken along the line GG of FIG.
  • the overall shape of the energy absorbing member 41 is substantially cylindrical. Is formed.
  • two areas 1201 and 1202 are set along the direction of the virtual axis 17 of the energy absorbing member 41.
  • bulged portions 32a and 32b having different shapes are formed.
  • a bulging portion 32 a is formed in the area 1201
  • a bulging portion 32 b is formed in the area 1202.
  • the bulging part 32a and the bulging part 32b are both rectangular.
  • the bulging portion 32a and the bulging portion 32b have the same diagonal dimension in the circumferential direction (vertical direction in FIG. 12A), but the dimension in the direction parallel to the shaft 17 (horizontal direction in FIG. 12A)
  • the bulging part 32a is longer than the bulging part 32b.
  • the bulging portions 32a and 32b bulge inward from the side surface of the energy absorbing member 41, and the bulging portion 32a is formed deeper than the bulging portion 32b.
  • the bulging portions 32a and 32b may have the same depth.
  • the bulging portions 32a and 32b can be formed by, for example, pressing.
  • the bulging portion 32a of the area 1201 and the bulging portion 32b of the area 1202 are formed in different shapes. For this reason, the axial drag and the impact energy absorption efficiency when an impact in the direction of the shaft 17 is applied to the energy absorbing member 41 are different in the area 1201 and the area 1202.
  • FIG. 15 shows the results of an experiment relating to impact energy absorbed by the energy absorbing member 41.
  • the vertical axis represents the reaction force (unit: kilonewtons) and the horizontal axis represents the stroke (unit: millimeters), but the coordinates are relative values.
  • an energy absorbing member having a total length in the direction of the axis 17 (see FIG. 12A) of 250 mm was used.
  • a characteristic curve 1510 shows an experimental result of the energy absorbing member 41 having a length L3 of 198 mm (and thus a length L4 of 52 mm).
  • a measurement point 1511 is a peak reaction force at the beginning of the collision in the curve 1510.
  • the characteristic curve 1520 shows the experimental results of the energy absorbing member 41 having a length L3 of 224 mm (thus, the length L4 is 26 mm).
  • a measurement point 1521 is a peak reaction force at the beginning of the collision in the curve 1520.
  • a characteristic curve 1530 is a comparative example (an energy absorbing member that belongs to the present invention but does not belong to the fourth embodiment), and only a substantially square bulging portion 32a is formed over the entire side surface. The experimental results of the energy absorbing member are shown.
  • a measurement point 1531 is a peak reaction force at the beginning of the collision in the curve 1530.
  • the energy absorbing member 41 according to the fourth embodiment (corresponding to the characteristic curves 1510 and 1520) has a peak reaction force at the initial stage of the collision as compared with the comparative example (corresponding to the characteristic curve 1530). It was possible to reduce. On the other hand, the reaction force other than the initial stage of the collision is substantially equal between the energy absorbing member 41 according to the fourth embodiment and the comparative example.
  • the arrangement direction is arbitrary, but the bulging portion 32b (area 1202) having the smaller axial drag force. It is more desirable to place the on the bumper side.
  • the peak value of the initial load is suppressed by providing the energy absorbing member 41 with a plurality of types (here, two types) of regions having different axial drag and impact energy absorption efficiency. It is possible to obtain an energy absorbing member 41 that is small in size, has high energy absorption efficiency, and can freely adjust the degree of energy absorption while reducing the obstacle value applied to the occupant.
  • the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the interior is filled with urethane or the like
  • the point etc. which may provide a material are the same as that of the said Embodiment 1.
  • Embodiment 5 of the Invention The energy absorbing member according to Embodiment 5 of the present invention is also used to absorb the impact of the bumper of automobile 100 (see FIG. 7).
  • FIG. 16A and 16B are conceptual diagrams showing the configuration of the energy absorbing member 51 according to the fifth embodiment, where FIG. 16A is a plan view and FIG. 16B is a cross-sectional view taken along the line HH in FIG. 16A.
  • two areas 1601 and 1602 are set along the axial direction of the cylinder.
  • bulged portions 52a and 52b having different shapes are formed.
  • a bulge portion 52a having a hexagonal shape and a small size is formed in the area 1601
  • a bulge portion 52b having a large size and a hexagonal shape in plan view is formed in the area 1602. ing.
  • the bulging portions 52a and 52b bulge inside the energy absorbing member 51, and the bulging portion 52a is formed deeper than the bulging portion 52b.
  • the bulging portions 52a and 52b may have the same depth.
  • the three-dimensional shape of the bulging portions 52a and 52b is the same as that in the first embodiment.
  • the bulging portions 52a and 52b can be formed by, for example, pressing.
  • the length of the areas 1601 and 1602 (the length in the direction of the axis 17) is not particularly limited, which is the same as in the fourth embodiment.
  • the axial drag and the impact energy absorption amount when an axial impact is applied are different in the area 1601 and the area 1602.
  • the peak reaction force at the initial stage of the collision can be kept low as compared with the case where the size of the bulging portion is constant, and the reaction force after the initial stage of the collision is greatly reduced. It can be low and stable.
  • the energy absorbing member 41 by providing the energy absorbing member 41 with a plurality of types (two types in this case) of areas having different axial drag and impact energy absorption efficiency, the peak value of the initial load is suppressed and the occupant is affected. It is possible to obtain the energy absorbing member 51 that is small in size, has high energy absorption efficiency, and can freely adjust the degree of energy absorption while reducing the obstacle value.
  • the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the inside is filled with urethane or the like
  • the point etc. which may provide a material are the same as that of the said Embodiment 1.
  • Embodiment 6 of the present invention is also used to absorb the impact of the bumper of automobile 100 (see FIG. 7).
  • FIGS. 17A and 17B are conceptual diagrams showing the configuration of the energy absorbing member 61 according to Embodiment 6, FIG. 17A is a plan view, and FIG. 17B is a cross-sectional view taken along the line II of FIG. 17A.
  • two areas 1701 and 1702 are set along the axial direction of the cylinder.
  • different bulging portions 62a and 62b are formed. Specifically, a small-size bulge 62a is formed in the area 1701, and a large-size bulge 62b is formed in the area 1702.
  • the shapes of the bulging portions 62a and 62b are substantially the same as those of the bulging portion 22 according to the second embodiment.
  • both ends of the second ridge lines 25 and 25 and both ends of the valley line 26 are joined to the outer peripheral line 23.
  • both ends and valleys of the second ridge lines 25 and 25 are formed. Both ends of the line 26 may be separated from the outer peripheral line 23.
  • the bulging portions 62 a and 62 b bulge inside the energy absorbing member 61.
  • the depths of the bulging portions 62a and 62b are substantially the same, but the bulging portion 62a may be formed deeper than the bulging portion 62b.
  • the bulging portions 62a and 62b can be formed by, for example, pressing.
  • the lengths of the areas 1701 and 1702 are not particularly limited, which is the same as in the fourth embodiment.
  • the axial drag and the impact energy absorption amount when an axial impact is applied are different in the area 1701 and the area 1702.
  • the peak reaction force at the initial stage of the collision can be kept low as compared with the case where the size of the bulging portion is constant, and the reaction force after the initial stage of the collision is greatly reduced. It can be low and stable. .
  • the energy absorbing member 41 by providing the energy absorbing member 41 with a plurality of types (two types in this case) of areas having different axial drag and impact energy absorption efficiency, the peak value of the initial load is suppressed and the passenger is applied to the occupant. It is possible to obtain the energy absorbing member 61 that is small in size, has high energy absorption efficiency, and can freely adjust the degree of energy absorption while reducing the obstacle value.
  • the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the interior is filled with urethane or the like
  • the point etc. which may provide a material are the same as that of the said Embodiment 1.
  • Embodiment 7 of the present invention is also used to absorb the bumper impact of automobile 100 (see FIG. 7).
  • This energy absorbing member (not shown) is different from Embodiments 4 to 6 in the shape of the bulging portion (not shown). Specifically, the bulging portion (not shown) of the seventh embodiment is formed so as to be circular in plan view. The rest is the same as in the fourth to seventh embodiments.
  • the shape of the bulging portion may be an elliptical shape in plan view.
  • the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the inside is filled with urethane or the like
  • the point etc. which may provide a material are the same as that of the said Embodiment 1.
  • the bulging portions are adjacent to each other. However, the bulging portions are close to each other, and a gap is formed between the bulging portions (that is, the bulging portions).
  • the configuration in which the original flat surface of the plate-like member remains between the portions may be employed.
  • the energy absorbing member is provided between the side member 102 of the automobile 100 and the bumper reinforcing member 104.
  • the energy absorbing member of the present invention may be provided at another part of the vehicle body. it can.
  • the energy absorbing member of the present invention can be applied to things other than automobiles.

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Abstract

The purpose of the present invention is to provide an energy absorption member having sufficiently low axial resistance at an early stage of collision but capable of absorbing a sufficiently large amount of energy throughout collision. The energy absorption member (11) has an approximately cylindrical shape with openings (12, 12) at both ends. A plurality of convex parts (13) adjoining or close to each other are formed on the side surface of the cylindrical shape. The convex parts (13) protrude toward the inside of the cylindrical shape. Since the convex parts (13) protrude toward the inside of the energy absorption member (11), axial resistance can be reduced at an early stage of collision, and the total amount of impact energy absorption can be increased.

Description

エネルギー吸収部材Energy absorbing member
　本発明は、自動車のバンパの構成部品等のエネルギー吸収部材に関する。 The present invention relates to an energy absorbing member such as a component part of an automobile bumper.
　自動車には、衝突時に外部からボディに伝わる衝撃エネルギーを吸収するための機構が設けられる。このために、自動車のフロントサイドメンバ前端やバンパステーには、エネルギー吸収部材が配設される。 The car is provided with a mechanism for absorbing impact energy transmitted from the outside to the body in the event of a collision. For this purpose, an energy absorbing member is disposed at the front end of the front side member of the automobile and the bumper stay.
　エネルギー吸収部材は、例えば、アルミニウム、スチール等を用いて、外形が四角筒状となるように形成される。そして、このエネルギー吸収部材は、例えば、四角筒の軸方向が自動車の前後方向となるように、配置される。 The energy absorbing member is formed using, for example, aluminum, steel or the like so that the outer shape is a square cylinder. And this energy absorption member is arrange | positioned so that the axial direction of a square cylinder may turn into the front-back direction of a motor vehicle, for example.
　エネルギー吸収部材は、四角筒の軸方向に加わった力で座屈変形することにより（すなわち、軸方向に収縮変形することにより）、衝突時の衝撃エネルギーを吸収する。このエネルギー吸収部材は、衝突時に、折れ曲がること無しに座屈変形することが望ましい。エネルギー吸収部材が折れ曲がってしまうと、衝撃エネルギーの吸収効率が悪くなるからである。 The energy absorbing member absorbs the impact energy at the time of collision by being buckled and deformed by a force applied in the axial direction of the square cylinder (that is, by contracting and deforming in the axial direction). The energy absorbing member is desirably buckled and deformed without being bent at the time of collision. This is because if the energy absorbing member is bent, the impact energy absorption efficiency is deteriorated.
　また、エネルギー吸収部材は、十分な軸抗力を有すること（すなわち、座屈変形に対して十分な反力を有すること）が要求される。一般的なエネルギー吸収部材では、軸抗力は、板厚や材質等の条件に応じて変化する。 Also, the energy absorbing member is required to have a sufficient axial resistance (that is, a sufficient reaction force against buckling deformation). In a general energy absorbing member, the axial drag changes according to conditions such as plate thickness and material.
　一方、衝撃エネルギー吸収総量（すなわち、座屈開始時から終了時までにエネルギー吸収部材が吸収する衝撃エネルギーの総量）を増大させようとすると、衝突初期の軸抗力が大きくなり過ぎるという問題が生じる。このことは、乗員への障害値を低減する上で、妨げとなっている。 On the other hand, if an attempt is made to increase the total impact energy absorption amount (that is, the total amount of impact energy absorbed by the energy absorbing member from the start to the end of buckling), the problem arises that the axial drag at the initial stage of collision becomes too large. This is a hindrance in reducing the obstacle value to the occupant.
　このような理由から、エネルギー吸収部材には、衝突初期の軸抗力が十分に低く、且つ、衝撃エネルギー吸収総量が十分に大きいことが、求められる。 For this reason, the energy absorbing member is required to have a sufficiently low axial drag at the beginning of the collision and a sufficiently large impact energy absorption amount.
　従来のエネルギー吸収部材としては、例えば、下記特許文献１に記載されたものが知られている。 As a conventional energy absorbing member, for example, one described in Patent Document 1 below is known.
　特許文献１のエネルギー吸収部材は、四角筒状の外周部にリブを設けてなる構造を備えるとともに、外周部とリブとの接続部分の断面積が小さくなるように形成されている。これにより、特許文献１の技術は、最大荷重の低減（すなわち、衝突初期の軸抗力の低減）や、エネルギー吸収量の増大を図っている。 The energy absorbing member of Patent Document 1 has a structure in which a rib is provided on the outer periphery of a square tube, and is formed so that the cross-sectional area of the connection portion between the outer periphery and the rib is small. Thereby, the technique of patent document 1 aims at reduction of the maximum load (that is, reduction of the axial drag at the initial stage of the collision) and increase of the amount of energy absorption.
特開平１１－２９０６４号公報JP-A-11-29064
　しかしながら、自動車の衝突時等における衝撃を十分に吸収するには、特許文献１の技術では、不十分である。 However, the technique of Patent Document 1 is insufficient to sufficiently absorb the impact at the time of a car collision or the like.
　また、特許文献１の技術では、外周部とリブとを一体に形成するので、製造工程が複雑となり、製造コストが高くなる。 In the technique of Patent Document 1, since the outer peripheral portion and the rib are integrally formed, the manufacturing process becomes complicated and the manufacturing cost increases.
　本発明は、衝突初期の軸抗力が十分に小さく、且つ、衝撃エネルギー吸収総量が十分に大きいエネルギー吸収部材を安価に提供することを課題としている。 An object of the present invention is to provide an energy absorbing member having a sufficiently small axial drag at the initial stage of impact and a sufficiently large impact energy absorption amount at a low cost.
　本発明に係るエネルギー吸収部材は、筒型の外形を有し、該筒の軸方向に座屈することによって該軸方向に加わった衝撃エネルギーを吸収するエネルギー吸収部材であって、前記円筒の側面に、複数の膨出部が、相互に隣接又は近接した状態で形成されており、且つ、該膨出部は、前記円筒の内方に向かって突出されたことを特徴とする。 An energy absorbing member according to the present invention has a cylindrical outer shape, and is an energy absorbing member that absorbs impact energy applied in the axial direction by buckling in the axial direction of the cylinder, and is provided on a side surface of the cylinder. The plurality of bulging portions are formed adjacent to or close to each other, and the bulging portions protrude toward the inside of the cylinder.
　本発明において、前記膨出部は、外形が正面視で略多角形となるように形成することができる。 In the present invention, the bulging portion can be formed so that the outer shape is substantially polygonal when viewed from the front.
　本発明において、前記膨出部は、外縁形状が正面視で矩形となるように形成され、一方の対角線に沿って稜線が形成されると共に、他方の対角線に沿って谷線を形成されることができる。 In the present invention, the bulging portion is formed so that the outer edge shape is rectangular in a front view, a ridge line is formed along one diagonal line, and a valley line is formed along the other diagonal line. Can do.
　本発明において、前記膨出部は、外形が正面視で略円形となるように形成されることができる。 In the present invention, the bulging portion may be formed so that the outer shape is substantially circular when viewed from the front.
　本発明においては、前記軸方向に沿って並ぶ複数の区域毎に前記膨出部の形状を異ならせることによって、これらの区域毎に、前記軸方向に加わった前記衝撃エネルギーの吸収量を異なる大きさに設定することができる。 In the present invention, by changing the shape of the bulging portion for each of the plurality of areas arranged along the axial direction, the absorption amount of the impact energy applied in the axial direction is different for each of the areas. Can be set.
　本発明においては、前記側面の全域にわたって、前記膨出部を隙間なく隣接して形成することができる。 In the present invention, the bulging portion can be formed adjacent to the entire side surface without a gap.
　本発明のエネルギー吸収部材は、自動車の車体強度部材と車幅方向に沿うバンパ補強部材との間に配設することができる。 The energy absorbing member of the present invention can be disposed between a vehicle body strength member of an automobile and a bumper reinforcing member along the vehicle width direction.
　本発明によれば、筒型のエネルギー吸収部材の側面に複数の膨出部を隣接又は近接した状態で形成したので、座屈に対する軸抗力や変形の態様を膨出部の形状や大きさによって調節することが可能になると共に、エネルギー吸収部材の折れ曲がりを防止することができる。更に、膨出部を筒の内方に向かって突出させたので、エネルギー吸収部材が座屈した際に、隣合う膨出部同士の干渉反力効果により、高いエネルギー吸収効率で、衝撃エネルギーを吸収することができる。従って、本発明によれば、衝突初期の軸抗力が十分に小さく、且つ、衝撃エネルギー吸収総量が十分に大きいエネルギー吸収部材を提供するっことができる。 According to the present invention, since the plurality of bulging portions are formed adjacent to or close to the side surface of the cylindrical energy absorbing member, the axial resistance and deformation mode against buckling can be changed depending on the shape and size of the bulging portion. It becomes possible to adjust, and the bending of the energy absorbing member can be prevented. Furthermore, since the bulging part protrudes inward of the cylinder, when the energy absorbing member is buckled, the impact energy is increased with high energy absorption efficiency due to the interference reaction force effect between the adjacent bulging parts. Can be absorbed. Therefore, according to the present invention, it is possible to provide an energy absorbing member having a sufficiently small axial drag at the initial stage of collision and a sufficiently large impact energy absorption amount.
　本発明において、膨出部の外形を正面視で略多角形に形成することにより、エネルギー吸収部材の側面と垂直な方向に向けて外部から加わった衝撃に対する抗力を高くできる。また、エネルギー吸収部材の座屈時に、軸方向に対する折れ曲がりが起きにくくなる。 In the present invention, by forming the outer shape of the bulging portion into a substantially polygonal shape when viewed from the front, it is possible to increase the resistance to an impact applied from the outside in a direction perpendicular to the side surface of the energy absorbing member. Further, when the energy absorbing member is buckled, bending in the axial direction is less likely to occur.
　本発明において、膨出部の外縁形状を正面視で矩形に形成し、一の対角線に沿って稜線を形成すると共に他の対角線に沿って谷線を形成することにより、エネルギー吸収部材の各対角線方向に向けて外部から加わった衝撃に対する抗力を高くできる。これにより、小型でエネルギー吸収効率の高いエネルギー吸収部材を、容易に形成することができる。 In the present invention, the outer edge shape of the bulging portion is formed in a rectangular shape in front view, a ridge line is formed along one diagonal line, and a valley line is formed along the other diagonal line, whereby each diagonal line of the energy absorbing member is formed. The resistance to external impact applied in the direction can be increased. Thereby, a small-sized energy absorption member with high energy absorption efficiency can be formed easily.
　本発明において、膨出部の外形を正面視で略円形に形成することにより、外部の多方向から加わった衝撃に対する抗力を高くできる。これにより、エネルギー吸収効率が高いエネルギー吸収部材を、容易に形成できる。 In the present invention, by forming the outer shape of the bulging portion into a substantially circular shape when viewed from the front, it is possible to increase the resistance to an impact applied from multiple external directions. Thereby, an energy absorption member with high energy absorption efficiency can be formed easily.
　本発明において、軸方向に沿った複数の区域毎に前記膨出部の形状を異ならせることで、これらの区域毎に、座屈に対する軸抗力と変形の態様とを異ならせることができ、これにより、衝突初期の軸抗力が小さくしつつ衝撃エネルギー吸収総量を増大させることが更に容易になる。 In the present invention, by changing the shape of the bulging portion for each of a plurality of areas along the axial direction, the axial resistance against buckling and the mode of deformation can be made different for each of these areas. This makes it easier to increase the total amount of shock energy absorption while reducing the axial drag at the beginning of the collision.
　本発明において、エネルギー吸収部材の側面全域にわたって膨出部を隙間なく隣接して形成することにより、衝突初期の軸抗力が小さくしつつ衝撃エネルギー吸収総量を増大させることが、さらに容易になる。 In the present invention, by forming the bulging portions adjacent to each other across the entire side surface of the energy absorbing member without any gap, it is further easier to increase the total amount of impact energy absorption while reducing the axial drag at the beginning of the collision.
　本発明のエネルギー吸収部材を自動車の車体強度部材と車幅方向に沿うバンパ補強部材との間に配設することにより、車両衝突時にバンパに作用する衝撃力をエネルギー吸収部材で有効に吸収させることができ、これにより、車体強度部材に伝達される衝撃力を低減できる。 By disposing the energy absorbing member of the present invention between the vehicle body strength member of the automobile and the bumper reinforcing member along the vehicle width direction, the energy absorbing member can effectively absorb the impact force acting on the bumper at the time of the vehicle collision. Thereby, the impact force transmitted to the vehicle body strength member can be reduced.
実施の形態１に係るエネルギー吸収部材の全体構造を示す概念図である。It is a conceptual diagram which shows the whole structure of the energy absorption member which concerns on Embodiment 1. FIG. 図１の部分Ａの拡大図である。It is an enlarged view of the part A of FIG. 図２のＢ－Ｂ端面図である。FIG. 3 is a BB end view of FIG. 2. 図２のＣ－Ｃ端面図である。FIG. 3 is a CC end view of FIG. 2. 実施の形態１に係るエネルギー吸収部材のエネルギー吸収特性の実験結果を示すグラフである。4 is a graph showing experimental results of energy absorption characteristics of the energy absorbing member according to Embodiment 1. 実施の形態１に係るエネルギー吸収部材のエネルギー吸収特性の実験結果を示すグラフである。4 is a graph showing experimental results of energy absorption characteristics of the energy absorbing member according to Embodiment 1. 実施の形態１のエネルギー吸収部材が適用される自動車の要部構成を示す概念図である。It is a conceptual diagram which shows the principal part structure of the motor vehicle to which the energy absorption member of Embodiment 1 is applied. 実施の形態２に係るエネルギー吸収部材の全体構造を示す概念図である。It is a conceptual diagram which shows the whole structure of the energy absorption member which concerns on Embodiment 2. FIG. 図８の部分Ｄの拡大図である。It is an enlarged view of the part D of FIG. 図９のＥ－Ｅ端面図である。FIG. 10 is an EE end view of FIG. 9. 図９のＦ－Ｆ端面図である。FIG. 10 is a FF end view of FIG. 9. 実施の形態４に係るエネルギー吸収部材の全体構造を示す概念的平面図である。6 is a conceptual plan view showing an overall structure of an energy absorbing member according to Embodiment 4. FIG. 実施の形態４に係るエネルギー吸収部材の全体構造を示す概念的平面図である。6 is a conceptual plan view showing an overall structure of an energy absorbing member according to Embodiment 4. FIG. 実施の形態４に係るエネルギー吸収部材の全体構造を示す概念的平面図である。6 is a conceptual plan view showing an overall structure of an energy absorbing member according to Embodiment 4. FIG. 図１２Ａの部分拡大図である。It is the elements on larger scale of FIG. 12A. 図１３のＧ－Ｇ端面図である。FIG. 14 is a GG end view of FIG. 13. 実施の形態４に係るエネルギー吸収部材のエネルギー吸収特性の実験結果を示すグラフである。It is a graph which shows the experimental result of the energy absorption characteristic of the energy absorption member which concerns on Embodiment 4. FIG. 実施の形態５に係るエネルギー吸収部材の全体構造を概念的に示す平面図である。It is a top view which shows notionally the whole structure of the energy absorption member which concerns on Embodiment 5. FIG. 図１６ＡのＨ－Ｈ断面図である。It is HH sectional drawing of FIG. 16A. 実施の形態６に係るエネルギー吸収部材の全体構造を概念的に示す平面図である。It is a top view which shows notionally the whole structure of the energy absorption member which concerns on Embodiment 6. FIG. 図１７ＡのＨ－Ｈ断面図である。It is HH sectional drawing of FIG. 17A.
＜発明の実施の形態１＞
　図１乃至図７に、この発明の実施の形態１を示す。 <Embodiment 1 of the Invention>
1 to 7 show a first embodiment of the present invention.
　この実施の形態１のエネルギー吸収部材１１（図１参照）は、自動車１００のバンパの衝撃を吸収するために使用される。自動車１００は、図７に示したように、エンジンルーム１０１の側部下方に、車両前後方向に延びるサイドメンバ１０２（本発明の「車体強度部材」に相当）を備えると共に、バンパ表皮１０３の内部に、車幅方向に沿って延びるバンパ補強部材１０４を備えている。そして、サイドメンバ１０２とバンパ表皮１０３との間には、車両前後方向とほぼ平行に、エネルギー吸収部材１１が配設されている。 The energy absorbing member 11 (see FIG. 1) of the first embodiment is used for absorbing the impact of the bumper of the automobile 100. As shown in FIG. 7, the automobile 100 includes a side member 102 (corresponding to the “body strength member” of the present invention) that extends in the vehicle front-rear direction below the side of the engine room 101, and the interior of the bumper skin 103. Further, a bumper reinforcing member 104 extending along the vehicle width direction is provided. An energy absorbing member 11 is disposed between the side member 102 and the bumper skin 103 substantially parallel to the vehicle front-rear direction.
　なお、図７においては、エネルギー吸収部材１１を自動車１００のフロント側のサイドメンバ１０２とバンパ補強部材１０４との間に設ける構成を示しているが、エネルギー吸収部材１１はリア側のサイドメンバ（図示せず）とバンパ補強部材（図示せず）との間に設けてもよい。 7 shows a configuration in which the energy absorbing member 11 is provided between the front side member 102 and the bumper reinforcing member 104 of the automobile 100. However, the energy absorbing member 11 is a rear side member (see FIG. 7). (Not shown) and a bumper reinforcing member (not shown) may be provided.
　エネルギー吸収部材１１は、剛性が高く、塑性変形することで外部から加わった運動エネルギーを吸収できる金属板材によって形成されている。この実施の形態１では、エネルギー吸収部材１１は、厚さ約１．８ミリメートルのアルミニウム単板によって形成される。ただし、エネルギー吸収部材１１は、剛性や運動エネルギー吸収特性が良好なものであれば、どのような材料で形成することもできる。例えば、鋼板、アルミメッキ鋼板、アルミニウム板と樹脂フィルム材とをラミネート構造にしたもの等、アルミニウム以外の金属、樹脂、およびそれらの合板等にて形成することもできる。 The energy absorbing member 11 is formed of a metal plate that has high rigidity and can absorb kinetic energy applied from the outside by plastic deformation. In the first embodiment, the energy absorbing member 11 is formed of a single aluminum plate having a thickness of about 1.8 millimeters. However, the energy absorbing member 11 can be formed of any material as long as it has good rigidity and kinetic energy absorption characteristics. For example, it can also be formed of a metal other than aluminum, such as a steel plate, an aluminized steel plate, a laminate of an aluminum plate and a resin film material, a resin, and a plywood thereof.
　また、この実施の形態１に係るエネルギー吸収部材１１はプレス加工によって形成されるが、それ以外のどのような加工方法によって形成されてもよい。 Further, although the energy absorbing member 11 according to the first embodiment is formed by pressing, it may be formed by any other processing method.
　エネルギー吸収部材１１は、図１に示す通り、円筒形に形成されている。エネルギー吸収部材１１は、中空で、両端に開口部１２，１２が設けられている。 The energy absorbing member 11 is formed in a cylindrical shape as shown in FIG. The energy absorbing member 11 is hollow and has openings 12 and 12 at both ends.
　エネルギー吸収部材１１は、図示しないボルト等によって、サイドメンバ１０２とバンパ補強部材１０４に固着される。これにより、エネルギー吸収部材１１は、仮想軸１７（エネルギー吸収部材１１が構成する円筒の中心軸）が自動車１００の前後方向と平行になるように、配設される。なお、エネルギー吸収部材１１は、円筒形に限らず、平面視（即ち開口部側から見た状態）で矩形の筒状、五角形の筒状、六角形の筒状など、多角形の筒状であってもよい。また、エネルギー吸収部材１１の内部が、軸方向に延びる仕切り部材によって仕切られていてもよい。更に、エネルギー吸収部材１１は、どのような方法でサイドメンバ１０２及びバンパ補強部材１０４に固着されてもよい。 The energy absorbing member 11 is fixed to the side member 102 and the bumper reinforcing member 104 with a bolt or the like (not shown). Thereby, the energy absorbing member 11 is disposed so that the virtual axis 17 (the central axis of the cylinder formed by the energy absorbing member 11) is parallel to the front-rear direction of the automobile 100. The energy absorbing member 11 is not limited to a cylindrical shape, and has a polygonal cylindrical shape such as a rectangular cylindrical shape, a pentagonal cylindrical shape, and a hexagonal cylindrical shape in a plan view (that is, viewed from the opening side). There may be. Moreover, the inside of the energy absorbing member 11 may be partitioned by a partition member extending in the axial direction. Further, the energy absorbing member 11 may be fixed to the side member 102 and the bumper reinforcing member 104 by any method.
　エネルギー吸収部材１１の全体構造は、剛性及び衝撃エネルギー吸収特性が良好でありさえすれば、上記のものに限定されない。例えば、両端に板材が設けられて内部空間が密閉された構造であってもよいし、内部にウレタン等の材料が充填されてもよい。 The overall structure of the energy absorbing member 11 is not limited to the above as long as the rigidity and impact energy absorption characteristics are good. For example, a structure in which plate materials are provided at both ends and the internal space is sealed may be used, or a material such as urethane may be filled therein.
　図１に示す通り、エネルギー吸収部材１１の板面の略全面には、例えばプレス加工により、複数の膨出部１３が形成されている。エネルギー吸収部材の膨出部１３は、正面視が多角形である。この実施の形態１においては、図２に示す通り、それぞれの膨出部１３は、全て同一形状に形成されている。即ち、それぞれの膨出部１３は、外形が正面視で六角形の同一形状であって、膨出の大きさが同一である。 As shown in FIG. 1, a plurality of bulging portions 13 are formed on substantially the entire plate surface of the energy absorbing member 11 by, for example, pressing. The bulging portion 13 of the energy absorbing member is polygonal when viewed from the front. In the first embodiment, as shown in FIG. 2, all the bulging portions 13 are formed in the same shape. That is, each bulging part 13 is the same hexagonal outer shape in front view, and the size of the bulging is the same.
　図３及び図４に示す通り、それぞれの膨出部１３は、エネルギー吸収部材１１の仮想外表面１８よりも、内側に向けて膨出している。膨出部１３の三組の対向する角を結ぶ線上には、図３及び図４に示す通り、エネルギー吸収部材１１の内側に向けて傾斜する稜線１４が形成されている。なお、この稜線１４はエネルギー吸収部材１１の内側から見た場合には稜線であるが、外側から見た場合には谷線となる。図３及び図４に示す通り、これら稜線１４は内側に湾曲する曲線を形成し、稜線１４の交点１５は、膨出方向の最高点となっている。膨出部１３の二つの稜線１４，１４と外形の一辺１６で囲まれた面は平面を形成する。全ての隣り合う膨出部１３は、互いに隙間なく隣接している。 3 and 4, each bulging portion 13 bulges inward from the virtual outer surface 18 of the energy absorbing member 11. On the line connecting the three opposing corners of the bulging portion 13, a ridge line 14 that is inclined toward the inner side of the energy absorbing member 11 is formed as shown in FIGS. 3 and 4. The ridge line 14 is a ridge line when viewed from the inside of the energy absorbing member 11, but is a valley line when viewed from the outside. As shown in FIGS. 3 and 4, these ridge lines 14 form a curve that curves inward, and the intersection 15 of the ridge lines 14 is the highest point in the bulging direction. A surface surrounded by the two ridge lines 14 and 14 of the bulging portion 13 and one side 16 of the outer shape forms a plane. All the adjacent bulging portions 13 are adjacent to each other without a gap.
　膨出部１３は、自動車１００の衝突時に受ける衝撃による運動エネルギーの吸収が良好となるような形状に、形成されている。この実施の形態１においては、膨出部１３は、外形の一辺が８ミリメートルとなり、且つ、高さが２ミリメートルとなるように形成されている。ただし、膨出部１３は、エネルギー吸収が良好でありさえすれば、どのような形状や寸法に形成されていてもよい。 The bulging portion 13 is formed in a shape that allows good absorption of kinetic energy due to an impact received when the automobile 100 collides. In the first embodiment, the bulging portion 13 is formed so that one side of the outer shape is 8 millimeters and the height is 2 millimeters. However, the bulging portion 13 may be formed in any shape or size as long as energy absorption is good.
　また、膨出部１３は、エネルギー吸収部材１１が座屈する際に、筒状の軸方向が折れ曲がりにくい態様で配設されている。具体的には、膨出部１３は、図１に示す通り、エネルギー吸収部材１１の全域にわたって配設されている。 Moreover, when the energy absorbing member 11 is buckled, the bulging portion 13 is disposed in such a manner that the cylindrical axial direction is not easily bent. Specifically, the bulging part 13 is arrange | positioned over the whole region of the energy absorption member 11, as shown in FIG.
　次に、このエネルギー吸収部材１１の作用について説明する。 Next, the operation of the energy absorbing member 11 will be described.
　自動車１００の前方からバンパ表皮１０３に衝撃荷重が作用すると、この衝撃荷重がバンパ補強部材１０４を介してエネルギー吸収部材１１に伝達される。このとき、エネルギー吸収部材１１はサイドメンバ１０２よりも座屈荷重を小さく設定しているため、仮想軸１７の方向に座屈する。これにより、サイドメンバ１０２への荷重の伝達を、抑制することができる。 When an impact load is applied to the bumper skin 103 from the front of the automobile 100, the impact load is transmitted to the energy absorbing member 11 via the bumper reinforcing member 104. At this time, the energy absorbing member 11 is buckled in the direction of the virtual axis 17 because the buckling load is set smaller than that of the side member 102. Thereby, transmission of the load to the side member 102 can be suppressed.
　ここで、エネルギー吸収部材１１に膨出部１３が設けられていることにより、衝突初期の軸抗力を低減させることができる。また、膨出部１３の外周部が座屈時の基準位置になるため、膨出部１３の大きさや配設位置等を調節することによって、エネルギー吸収特性を調節することができる。すなわち、この実施の形態１のエネルギー吸収部材１１では、側面が平面に形成されたエネルギー吸収部材と異なり、壁の長さ、板厚、材質を変更すること無しに、エネルギー吸収特性を調節することができる。 Here, since the bulging portion 13 is provided in the energy absorbing member 11, the axial drag at the initial stage of the collision can be reduced. Moreover, since the outer peripheral part of the bulging part 13 becomes a reference position at the time of buckling, the energy absorption characteristic can be adjusted by adjusting the size, arrangement position, and the like of the bulging part 13. That is, in the energy absorbing member 11 of the first embodiment, unlike the energy absorbing member having a flat side surface, the energy absorbing characteristics are adjusted without changing the wall length, plate thickness, and material. Can do.
　また、膨出部１３はエネルギー吸収部材１１の略全面に設けられているので、エネルギー吸収部材１１の全面において、高いエネルギー吸収効率を得ることができる。そのため、この実施の形態１では、エネルギー吸収部材１１が座屈する際に、仮想軸１７と非平行な方向に折れ曲がることを抑制できる。すなわち、エネルギー吸収部材１１に衝撃が加わった際に、座屈前の仮想軸１７の軸方向に均等に座屈させて、高いエネルギー吸収効率を得ることができる。 Further, since the bulging portion 13 is provided on substantially the entire surface of the energy absorbing member 11, high energy absorption efficiency can be obtained on the entire surface of the energy absorbing member 11. Therefore, in this Embodiment 1, when the energy absorption member 11 buckles, it can suppress bending in the direction non-parallel to the virtual axis | shaft 17. FIG. That is, when an impact is applied to the energy absorbing member 11, the energy absorbing member 11 can be buckled evenly in the axial direction of the virtual axis 17 before buckling, and high energy absorption efficiency can be obtained.
　上述のように、膨出部１３は、エネルギー吸収部材１１の内方に向かって突出している。そのため、エネルギー吸収部材１１が座屈した際には、隣合う膨出部１３，１３同士に干渉反力効果が生じる。そして、この干渉反力効果により、衝撃を吸収する効果を高めることができる。この結果、エネルギー吸収部材１１は、高いエネルギー吸収効率で衝撃を吸収することができる。 As described above, the bulging portion 13 protrudes inward of the energy absorbing member 11. Therefore, when the energy absorbing member 11 is buckled, an interference reaction force effect occurs between the adjacent bulging portions 13 and 13. And the effect which absorbs an impact can be heightened by this interference reaction force effect. As a result, the energy absorbing member 11 can absorb an impact with high energy absorption efficiency.
　ここで、図５及び図６に、このエネルギー吸収部材１１が吸収する衝撃エネルギーに関する実験の結果を示す。図５において、縦軸は反力（単位：キロニュートン）、縦軸はストローク（単位：ミリメートル）である。また、図６において、縦軸は吸収エネルギー（単位：キロジュール）、横軸はストローク（単位：ミリメートル）である。 Here, FIG. 5 and FIG. 6 show the results of an experiment relating to the impact energy absorbed by the energy absorbing member 11. In FIG. 5, the vertical axis represents the reaction force (unit: kilonewtons), and the vertical axis represents the stroke (unit: millimeters). In FIG. 6, the vertical axis represents absorbed energy (unit: kilojoule), and the horizontal axis represents stroke (unit: millimeter).
　図５及び図６において、曲線１１０は、この実施の形態１のエネルギー吸収部材１１の一端を固定部材に取り付け、他端側から５００ｋｇの剛体を３ｍの高さから自由落下させ、初速２７．６ｋｍ／ｈで軸圧潰させたときの反力の変化、及び吸収エネルギーの変化の状態を示している。なお、実験で用いたエネルギー吸収部材１１は、ＳＰＣ４４０Ｗ／１．０ｔ（ＹＰ：３５５ＭＰａ，ＴＳ：４８３ＭＰａ，Ｅｌ：３３％）の鋼材によって形成されている。また、このエネルギー吸収部材１１の直径は、１０５ｍｍである。 5 and 6, a curve 110 indicates that one end of the energy absorbing member 11 of the first embodiment is attached to the fixing member, and a 500 kg rigid body is freely dropped from a height of 3 m from the other end side, and the initial speed is 27.6 km. The state of change in reaction force and change in absorbed energy when the shaft is crushed at / h is shown. The energy absorbing member 11 used in the experiment is formed of a steel material of SPC440W / 1.0t (YP: 355 MPa, TS: 483 MPa, El: 33%). The energy absorbing member 11 has a diameter of 105 mm.
　図５及び図６には、更に、比較例としてのエネルギー吸収部材のエネルギー吸収特性の実験結果が示されている。 5 and 6 further show experimental results of energy absorption characteristics of an energy absorbing member as a comparative example.
　符号１２０は、第１の比較例としてのエネルギー吸収部材（図示せず）の実験結果を示す特性曲線である。第１の比較例は、当該エネルギー吸収部材の材質、形状、直径はこの実施の形態１のエネルギー吸収部材１１と同じだが、膨出部１３のない平板で形成された点が相違する。 Numeral 120 is a characteristic curve showing an experimental result of an energy absorbing member (not shown) as a first comparative example. The first comparative example is different in that the material, shape, and diameter of the energy absorbing member are the same as those of the energy absorbing member 11 of the first embodiment, but are formed of a flat plate without the bulging portion 13.
　符号１３０は、第２の比較例としてのエネルギー吸収部材（図示せず）の実験結果を示す特性曲線である。第２の比較例は、当該エネルギー吸収部材の材質、形状、直径、膨出部の大きさや配置はこの実施の形態１のエネルギー吸収部材１１と同じだが、膨出部が筒状の外方に向けて突出するように形成された点が相違する。 Numeral 130 is a characteristic curve showing an experimental result of an energy absorbing member (not shown) as a second comparative example. In the second comparative example, the material, shape, diameter, size and arrangement of the bulging part of the energy absorbing member are the same as those of the energy absorbing member 11 of the first embodiment, but the bulging part is formed in a cylindrical outer side. The point which was formed so that it may protrude toward it differs.
　符号１４０は、第３の比較例としてのエネルギー吸収部材（図示せず）の実験結果を示す特性曲線である。第３の比較例は、当該エネルギー吸収部材の材質、形状、膨出部の大きさや配置、膨出部が筒状の外方に向けて突出するように形成された点では第２の比較例のエネルギー吸収部材１１と同じだが、直径が１００ｍｍに形成された点が第２の比較例と相違する。 Numeral 140 is a characteristic curve showing an experimental result of an energy absorbing member (not shown) as a third comparative example. The third comparative example is the second comparative example in that the material of the energy absorbing member, the shape, the size and arrangement of the bulging portion, and the bulging portion are formed so as to protrude outward in the cylindrical shape. This is the same as the energy absorbing member 11 except that the diameter is 100 mm, which is different from the second comparative example.
　第１乃至第３の比較例に対する実験方法は、この実施の形態１のエネルギー吸収部材１１に対する実験方法と同じである。 The experimental method for the first to third comparative examples is the same as the experimental method for the energy absorbing member 11 of the first embodiment.
　図５に示す通り、実施の形態１のエネルギー吸収部材１１が座屈したときの初期反力のピーク（符号１１１に示す位置）の値は、第２の比較例の初期反力のピーク（符号１３１に示す位置）と同様の約８０ｆ／ｋＮである。これは、第１の比較例の初期反力のピーク（符号１２１に示す位置）の約１３０ｆ／ｋＮよりも低い。 As shown in FIG. 5, the initial reaction force peak (position indicated by reference numeral 111) when the energy absorbing member 11 of the first embodiment buckles is the initial reaction force peak (reference numeral 111) of the second comparative example. It is approximately 80 f / kN, similar to the position indicated by 131). This is lower than about 130 f / kN of the peak of the initial reaction force (position indicated by reference numeral 121) in the first comparative example.
　一方、図６において、各エネルギー吸収部材のエネルギー吸収総量（すなわち、座屈開始時から終了時までにエネルギー吸収部材が吸収する衝撃エネルギーの総量）は、各グラフと横軸で挟まれた部分の面積に等しい。図６に示す通り、実施の形態１のエネルギー吸収部材１１の吸収エネルギー総量は、第１の比較例及び第３の比較例の吸収エネルギー総量とほぼ等しい。またこれは、第２の比較例の吸収エネルギー総量よりも大きい。 On the other hand, in FIG. 6, the total energy absorption amount of each energy absorbing member (that is, the total amount of impact energy absorbed by the energy absorbing member from the start to the end of buckling) is the portion between each graph and the horizontal axis. Equal to the area. As shown in FIG. 6, the total absorbed energy of the energy absorbing member 11 of the first embodiment is substantially equal to the total absorbed energy of the first comparative example and the third comparative example. This is larger than the total absorbed energy of the second comparative example.
　図５及び図６に示す通り、この実施の形態１のエネルギー吸収部材１１は、第１の比較例（すなわち、膨出部を持たない平らな板で形成されたエネルギー吸収部材）とほぼ同等の衝突エネルギー吸収量を有しているが、更に大きな特徴は、初期荷重のピーク値が著しく低く、且つ、初期荷重後も安定した反力をストローク全体に渡って維持できる点にある。 As shown in FIGS. 5 and 6, the energy absorbing member 11 of the first embodiment is substantially equivalent to the first comparative example (that is, the energy absorbing member formed of a flat plate having no bulging portion). Although it has a collision energy absorption amount, a further feature is that the peak value of the initial load is remarkably low, and a stable reaction force can be maintained over the entire stroke even after the initial load.
　一方、図５に示す通り、第２の比較例のエネルギー吸収部材は、初期荷重のピーク値が低いという点や、初期荷重後のストロークにおける反力の安定性という点では、この実施の形態１のエネルギー吸収部材１１と似た傾向を示している。しかし、図６に示す通り、第２の比較例のエネルギー吸収部材は、吸収エネルギー総量の性能では、この実施の形態１に係るエネルギー吸収部材１１と比較して明らかに劣る。そして、第２の比較例と第３の比較例との対比により、膨出部が筒状の外側に突出する構成で第１の比較例と同様のエネルギー吸収総量を得るには、エネルギー吸収部材の直径を第１の比較例と異なる大きさに形成しなければならないことが判る。 On the other hand, as shown in FIG. 5, the energy absorbing member of the second comparative example is the first embodiment in that the peak value of the initial load is low and the stability of the reaction force in the stroke after the initial load. The tendency similar to that of the energy absorbing member 11 is shown. However, as shown in FIG. 6, the energy absorbing member of the second comparative example is clearly inferior to the energy absorbing member 11 according to the first embodiment in terms of the total absorbed energy. And by contrast with a 2nd comparative example and a 3rd comparative example, in order to obtain the energy absorption total amount similar to a 1st comparative example by the structure which a bulging part protrudes on the cylindrical outer side, an energy absorption member It can be seen that the diameter of the substrate must be different from that of the first comparative example.
　この実験結果から、この実施の形態１のエネルギー吸収部材１１は、膨出部１３が筒状の内方に向かって突出されていることにより、座屈した際に、初期荷重のピーク値を抑制しながらも、隣合う膨出部１３，１３同士の干渉反力効果により、膨出部が形成されていないエネルギー吸収部材と同等の高いエネルギー吸収効率で衝撃を吸収できることがわかる。 From this experimental result, the energy absorbing member 11 according to the first embodiment suppresses the peak value of the initial load when the bulging portion 13 protrudes toward the inner side of the cylinder, thereby buckling. However, it can be seen that the impact can be absorbed with high energy absorption efficiency equivalent to that of the energy absorbing member in which the bulging portion is not formed due to the interference reaction force effect between the bulging portions 13 and 13 adjacent to each other.
　以上示した通り、この実施の形態１においては、初期荷重のピーク値を抑え、乗員にかかる障害値を小さくしながら、且つ小型でエネルギー吸収効率が高く、エネルギー吸収の度合いを自在に調節できるエネルギー吸収部材１１を形成できる。 As described above, in the first embodiment, the peak value of the initial load is suppressed, the obstacle value applied to the occupant is reduced, the energy is small, the energy absorption efficiency is high, and the degree of energy absorption can be freely adjusted. The absorbing member 11 can be formed.
　＜発明の実施の形態２＞
　図８乃至図１１に、この発明の実施の形態２を示す。 <Embodiment 2 of the Invention>
8 to 11 show a second embodiment of the present invention.
　この発明の実施の形態２のエネルギー吸収部材２１も、図７に示す自動車１００のバンパの衝撃吸収に用いられる。このエネルギー吸収部材２１では、膨出部２２の形状が、実施の形態１のエネルギー吸収部材１１に係る膨出部１３と異なる。 The energy absorbing member 21 according to the second embodiment of the present invention is also used for shock absorption of the bumper of the automobile 100 shown in FIG. In this energy absorbing member 21, the shape of the bulging portion 22 is different from that of the bulging portion 13 according to the energy absorbing member 11 of the first embodiment.
　図８に示す通り、この実施の形態２の膨出部２２は、エネルギー吸収部材２１の略全面にわたって形成されている。かかる膨出部２２は、例えばプレス加工等によって形成される。膨出部２２は、図１０及び図１１における、エネルギー吸収部材２１の図中二点鎖線で示す仮想外表面２８より、内側に向けて膨出している。 As shown in FIG. 8, the bulging portion 22 of the second embodiment is formed over substantially the entire surface of the energy absorbing member 21. The bulging portion 22 is formed by, for example, pressing. The bulging portion 22 bulges inward from a virtual outer surface 28 indicated by a two-dot chain line in the drawings of the energy absorbing member 21 in FIGS. 10 and 11.
　図９に示す通り、各膨出部２２の外縁形状は、同一形状の略矩形である（図９の外周線２３参照）。図９に示す通り、膨出部２２は、それぞれの対角線がエネルギー吸収部材２１の軸方向及び周方向に沿うように、配設されている。図１０及び図１１に示す通り、膨出部２２は、外周線２３からエネルギー吸収部材２１の内側に膨出しており、膨出の大きさが同一である。膨出部２２の、エネルギー吸収部材２１の周方向に沿う対角線上（即ち、図９における左右方向）には、第一の稜線２４が設けられている。また、膨出部２２の、エネルギー吸収部材２１の軸方向に沿う対角線上（即ち、図９における左右方向）には、谷線２６が設けられている。 As shown in FIG. 9, the outer edge shape of each bulging portion 22 is a substantially rectangular shape (see the outer circumferential line 23 in FIG. 9). As shown in FIG. 9, the bulging portions 22 are arranged so that the respective diagonal lines are along the axial direction and the circumferential direction of the energy absorbing member 21. As shown in FIGS. 10 and 11, the bulging portion 22 bulges from the outer peripheral line 23 to the inside of the energy absorbing member 21, and the size of the bulging is the same. A first ridge line 24 is provided on a diagonal line of the bulging portion 22 along the circumferential direction of the energy absorbing member 21 (that is, in the left-right direction in FIG. 9). A trough line 26 is provided on the bulging portion 22 on a diagonal line along the axial direction of the energy absorbing member 21 (that is, in the left-right direction in FIG. 9).
　谷線２６の両側部には、一対の第二の稜線２５，２５が設けられている。図９に示す通り、第二の稜線２５，２５は、正面視で菱形の形状を呈している。第二の稜線２５，２５の略中央部には、第一の稜線２４の一端部が接合している。また、第二の稜線２５，２５の両端部及び谷線２６の両端部は、外周線２３から離間している。 A pair of second ridge lines 25 and 25 are provided on both sides of the valley line 26. As shown in FIG. 9, the second ridge lines 25, 25 have a rhombus shape in front view. One end of the first ridge line 24 is joined to the approximate center of the second ridge lines 25 and 25. Further, both end portions of the second ridge lines 25 and 25 and both end portions of the valley line 26 are separated from the outer peripheral line 23.
　なお、第一の稜線２４、及び第二の稜線２５は、エネルギー吸収部材２１の内側から見た場合には稜線であるが、外側から見た場合には谷線となる。また、谷線２６は、エネルギー吸収部材２１の内側から見た場合には谷線であるが、外側から見た場合には稜線となる。 The first ridge line 24 and the second ridge line 25 are ridge lines when viewed from the inside of the energy absorbing member 21, but are valley lines when viewed from the outside. The valley line 26 is a valley line when viewed from the inside of the energy absorbing member 21, but becomes a ridge line when viewed from the outside.
　また、図１０に示す、谷線２６とエネルギー吸収部材２１の仮想軸１７との距離Ｌ１は、外周線２３と仮想軸１７との距離Ｌ２よりも長くなるように設定されている。 Further, the distance L1 between the valley line 26 and the virtual axis 17 of the energy absorbing member 21 shown in FIG. 10 is set to be longer than the distance L2 between the outer peripheral line 23 and the virtual axis 17.
　それ以外の構成は、実施の形態１と同じである。 Other configurations are the same as those in the first embodiment.
　この実施の形態２のエネルギー吸収部材２１は、外縁形状が略矩形の膨出部２２を設けたことにより、板状部材が座屈した際に高いエネルギー吸収効率で衝撃を吸収することができる。また、膨出部２２は、外縁形状が正面視で略矩形に形成されていることに加えて、一の対角線に沿って第一の稜線２４が形成されると共に他の対角線に沿って谷線２６が形成されていることにより、エネルギー吸収部材の各対角線方向に向けて外部から加わった衝撃に対する抗力を高くすることができる。 The energy absorbing member 21 of the second embodiment can absorb an impact with high energy absorption efficiency when the plate-like member is buckled by providing the bulging portion 22 having a substantially rectangular outer edge shape. Further, the bulging portion 22 has a first ridge line 24 formed along one diagonal line and a valley line along the other diagonal line in addition to the outer edge shape being formed in a substantially rectangular shape in front view. Since 26 is formed, it is possible to increase the resistance to an impact applied from the outside toward each diagonal direction of the energy absorbing member.
　具体的には、膨出部２２の外周線２３と第一の稜線２４が座屈時の基準位置になると共に、谷線２６が座屈方向に対して抗力を奏する「突っ張り」としての機能を果たす。そのため、この実施の形態２に係るエネルギー吸収部材２１は、座屈に対する軸抗力や変形の態様を、壁の長さ、板厚、材質を変更せずに調節でき、且つ、エネルギー吸収部材２１の強度を高めることができる。これにより、この実施の形態２においては、小型でエネルギー吸収効率が高く、エネルギー吸収の度合いを自在に調節できるエネルギー吸収部材２１を得ることができる。 Specifically, the outer peripheral line 23 and the first ridge line 24 of the bulging portion 22 serve as reference positions for buckling, and the function as a “tension” in which the valley line 26 exerts a drag in the buckling direction. Fulfill. Therefore, the energy absorbing member 21 according to the second embodiment can adjust the axial resistance and the deformation mode against buckling without changing the wall length, the plate thickness, and the material, and the energy absorbing member 21 Strength can be increased. Thereby, in this Embodiment 2, the energy absorption member 21 which is small, has high energy absorption efficiency, and can adjust the degree of energy absorption freely can be obtained.
　なお、上記実施の形態２においては、第二の稜線２５，２５の両端部及び谷線２６の両端部を外周線２３から離間させて形成したが、第二の稜線２５，２５の両端部及び谷線２６の両端部が外周線２３に接合するように形成してもよい。 In the second embodiment, both end portions of the second ridge lines 25 and 25 and both end portions of the valley line 26 are formed apart from the outer peripheral line 23. However, both end portions of the second ridge lines 25 and 25 and You may form so that the both ends of the valley line 26 may join to the outer periphery line 23. FIG.
　また、上記実施の形態２においては、膨出部２２の、エネルギー吸収部材２１の周方向に沿う対角線上に稜線（第一の稜線２４）を設け且つエネルギー吸収部材２１の軸方向に沿う対角線上には谷線２６を設けたが、逆に、膨出部２２の、エネルギー吸収部材２１の周方向に沿う対角線上に谷線を設け且つ軸方向に沿う対角線上に稜線を設けてもよい。また、膨出部２２の、エネルギー吸収部材２１の周方向及び軸方向に沿う対角線上の双方に谷線又は稜線を設けてもよい。 Moreover, in the said Embodiment 2, a ridgeline (1st ridgeline 24) is provided on the diagonal along the circumferential direction of the energy absorption member 21 of the bulging part 22, and on the diagonal along the axial direction of the energy absorption member 21 In contrast, the valley line 26 is provided, but conversely, the valley line may be provided on the diagonal line along the circumferential direction of the energy absorbing member 21 and the ridge line may be provided on the diagonal line along the axial direction. Moreover, you may provide a trough line or a ridgeline in both the circumferential direction of the energy absorption member 21 of the bulging part 22, and the diagonal line along an axial direction.
　なお、この実施の形態２において、エネルギー吸収部材を多角形としても良い点、内部に仕切り部材を設けてもよい点、両端に板材を設けて密閉しても良い点、内部にウレタン等の充填材を設けても良い点等は、上記実施の形態１と同様である。 In the second embodiment, the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the inside is filled with urethane or the like The point etc. which may provide a material are the same as that of the said Embodiment 1. FIG.
　＜発明の実施の形態３＞
　この発明の実施の形態３のエネルギー吸収部材（図示せず）も、自動車１００のバンパの衝撃を吸収するために使用される（図７参照）。 <Third Embodiment of the Invention>
The energy absorbing member (not shown) of Embodiment 3 of the present invention is also used to absorb the impact of the bumper of automobile 100 (see FIG. 7).
　このエネルギー吸収部材（図示せず）は、膨出部（図示せず）の形状が、実施の形態１及び２のエネルギー吸収部材１１,２１の膨出部１３,２２と異なる。具体的には、この実施の形態３の膨出部（図示せず）は、平面視が円形となるように形成されている。それ以外は実施の形態１及び２と同じである。 This energy absorbing member (not shown) is different from the bulging portions 13 and 22 of the energy absorbing members 11 and 21 of the first and second embodiments in the shape of the bulging portion (not shown). Specifically, the bulging portion (not shown) of the third embodiment is formed so as to be circular in plan view. The rest is the same as in the first and second embodiments.
　これにより、エネルギー吸収部材（図示せず）の外部の多方向から加わった衝撃に対する抗力を高くできる。 This makes it possible to increase the resistance to an impact applied from multiple directions outside the energy absorbing member (not shown).
　なお、膨出部の形状は、平面視で楕円形でもよい。 In addition, the shape of the bulging portion may be elliptical in plan view.
　なお、この実施の形態３において、エネルギー吸収部材を多角形としても良い点、内部に仕切り部材を設けてもよい点、両端に板材を設けて密閉しても良い点、内部にウレタン等の充填材を設けても良い点等は、上記実施の形態１と同様である。 In the third embodiment, the energy absorbing member may be polygonal, the partition member may be provided inside, the plate material may be provided at both ends and sealed, and the inside is filled with urethane or the like The point etc. which may provide a material are the same as that of the said Embodiment 1. FIG.
　＜発明の実施の形態４＞
　図１２Ａ乃至図１５に、この発明の実施の形態４を示す。 <Embodiment 4 of the Invention>
12A to 15 show a fourth embodiment of the present invention.
　この発明の実施の形態４のエネルギー吸収部材４１も、自動車１００（図７参照）のバンパの衝撃吸収に用いられる。 The energy absorbing member 41 according to the fourth embodiment of the present invention is also used for shock absorption of the bumper of the automobile 100 (see FIG. 7).
　図１２Ａは、この実施の形態４に係るエネルギー吸収部材４１の構造を概念的に示す側面図である。また、図１３は図１２Ａの部分拡大図、図１４は図１３のＧ－Ｇ断面図である。 FIG. 12A is a side view conceptually showing the structure of the energy absorbing member 41 according to the fourth embodiment. 13 is a partially enlarged view of FIG. 12A, and FIG. 14 is a cross-sectional view taken along the line GG of FIG.
　エネルギー吸収部材４１は、実施の形態１に係るエネルギー吸収部材１１（図１参照）や実施の形態２に係るエネルギー吸収部材２１（図８参照）と同様、全体的な外形が、略筒形に形成されている。 Similar to the energy absorbing member 11 (see FIG. 1) according to the first embodiment and the energy absorbing member 21 (see FIG. 8) according to the second embodiment, the overall shape of the energy absorbing member 41 is substantially cylindrical. Is formed.
　この実施の形態では、エネルギー吸収部材４１の仮想軸１７の方向に沿って、２個の区域１２０１，１２０２が設定されている。そして、これらの区域１２０１，１２０２には、形状の異なる膨出部３２ａ，３２ｂが形成されている。図１２Ａの例では、区域１２０１には膨出部３２ａが形成され、また、区域１２０２には膨出部３２ｂが形成されている。膨出部３２ａ及び膨出部３２ｂは、共に矩形である。また、膨出部３２ａと膨出部３２ｂとは、円周方向（図１２Ａの上下方向）の対角線の寸法は同一であるが、軸１７と平行な方向（図１２Ａの左右方向）の寸法は、膨出部３２ａが膨出部３２ｂよりも長い。図１４に示したように、膨出部３２ａ，３２ｂは、エネルギー吸収部材４１の側面から内側に膨出しており、且つ、膨出部３２ａの方が膨出部３２ｂよりも深く形成されている。但し、膨出部３２ａ，３２ｂの深さは同じであっても良い。膨出部３２ａ，３２ｂは、例えばプレス加工等によって形成することができる。 In this embodiment, two areas 1201 and 1202 are set along the direction of the virtual axis 17 of the energy absorbing member 41. In these areas 1201 and 1202, bulged portions 32a and 32b having different shapes are formed. In the example of FIG. 12A, a bulging portion 32 a is formed in the area 1201, and a bulging portion 32 b is formed in the area 1202. The bulging part 32a and the bulging part 32b are both rectangular. The bulging portion 32a and the bulging portion 32b have the same diagonal dimension in the circumferential direction (vertical direction in FIG. 12A), but the dimension in the direction parallel to the shaft 17 (horizontal direction in FIG. 12A) The bulging part 32a is longer than the bulging part 32b. As shown in FIG. 14, the bulging portions 32a and 32b bulge inward from the side surface of the energy absorbing member 41, and the bulging portion 32a is formed deeper than the bulging portion 32b. . However, the bulging portions 32a and 32b may have the same depth. The bulging portions 32a and 32b can be formed by, for example, pressing.
　このように、この実施の形態４では、区域１２０１の膨出部３２ａと区域１２０２の膨出部３２ｂとを異なる形状に形成した。このため、軸１７の方向の衝撃がエネルギー吸収部材４１に加わった場合の軸抗力や衝撃エネルギー吸収効率は、区域１２０１と区域１２０２とで異なる大きさになる。 Thus, in the fourth embodiment, the bulging portion 32a of the area 1201 and the bulging portion 32b of the area 1202 are formed in different shapes. For this reason, the axial drag and the impact energy absorption efficiency when an impact in the direction of the shaft 17 is applied to the energy absorbing member 41 are different in the area 1201 and the area 1202.
　なお、区域１２０１，１２０２の長さ（軸１７方向の長さ）Ｌ３，Ｌ４は、自由に変更することができ、図１２Ａに示したようにＬ３＜Ｌ４であっても良いし、図１２Ｂ、図１２Ｃに示したようにＬ３＞Ｌ４であってもよいし、Ｌ３＝Ｌ４であってもよい。 The lengths of the sections 1201 and 1202 (length in the direction of the axis 17) L3 and L4 can be freely changed, and as shown in FIG. 12A, L3 <L4 may be satisfied, or FIG. L3> L4 may be sufficient as shown to FIG. 12C, and L3 = L4 may be sufficient.
　他の構成は、上述の実施の形態１と同様である。 Other configurations are the same as those in the first embodiment.
　図１５は、エネルギー吸収部材４１が吸収する衝撃エネルギーに関する実験の結果を示す。図１５において、縦軸は反力（単位：キロニュートン）、横軸はストローク（単位：ミリメートル）であるが、座標は相対値としてある。なお、図１５に係る実験では、軸１７方向の全長（図１２Ａ参照）が２５０ｍｍのエネルギー吸収部材を使用した。 FIG. 15 shows the results of an experiment relating to impact energy absorbed by the energy absorbing member 41. In FIG. 15, the vertical axis represents the reaction force (unit: kilonewtons) and the horizontal axis represents the stroke (unit: millimeters), but the coordinates are relative values. In the experiment according to FIG. 15, an energy absorbing member having a total length in the direction of the axis 17 (see FIG. 12A) of 250 mm was used.
　図１５において、特性曲線１５１０は、長さＬ３が１９８ｍｍ（従って、長さＬ４が５２ｍｍ）のエネルギー吸収部材４１の実験結果を示している。また、測定点１５１１は、曲線１５１０における、衝突初期のピーク反力である。 15, a characteristic curve 1510 shows an experimental result of the energy absorbing member 41 having a length L3 of 198 mm (and thus a length L4 of 52 mm). A measurement point 1511 is a peak reaction force at the beginning of the collision in the curve 1510.
　特性曲線１５２０は、長さＬ３が２２４ｍｍ（従って、長さＬ４が２６ｍｍ）のエネルギー吸収部材４１の実験結果を示している。また、測定点１５２１は、曲線１５２０における、衝突初期のピーク反力である。 The characteristic curve 1520 shows the experimental results of the energy absorbing member 41 having a length L3 of 224 mm (thus, the length L4 is 26 mm). A measurement point 1521 is a peak reaction force at the beginning of the collision in the curve 1520.
　一方、特性曲線１５３０は、比較例（本発明には属するが、この実施の形態４には属さないエネルギー吸収部材）であり、略正方形で大寸法の膨出部３２ａのみが側面全域に形成されたエネルギー吸収部材の実験結果を示している。また、測定点１５３１は、曲線１５３０における、衝突初期のピーク反力である。 On the other hand, a characteristic curve 1530 is a comparative example (an energy absorbing member that belongs to the present invention but does not belong to the fourth embodiment), and only a substantially square bulging portion 32a is formed over the entire side surface. The experimental results of the energy absorbing member are shown. A measurement point 1531 is a peak reaction force at the beginning of the collision in the curve 1530.
　図１５から解るように、この実施の形態４に係るエネルギー吸収部材４１（特性曲線１５１０，１５２０に対応）は、比較例（特性曲線１５３０に対応）と比較して、衝突初期のピーク反力を低下させることができた。その一方で、衝突初期時以外の反力は、この実施の形態４に係るエネルギー吸収部材４１と比較例とで、略同等である。 As can be seen from FIG. 15, the energy absorbing member 41 according to the fourth embodiment (corresponding to the characteristic curves 1510 and 1520) has a peak reaction force at the initial stage of the collision as compared with the comparative example (corresponding to the characteristic curve 1530). It was possible to reduce. On the other hand, the reaction force other than the initial stage of the collision is substantially equal between the energy absorbing member 41 according to the fourth embodiment and the comparative example.
　この実施の形態４のエネルギー吸収部材４１を自動車１００（図７参照）のバンパの衝撃吸収に使用する場合の配置方向は任意であるが、軸抗力が小さい方の膨出部３２ｂ（区域１２０２）をバンパー側に配置する方が、より望ましい。 When the energy absorbing member 41 according to the fourth embodiment is used for absorbing the impact of the bumper of the automobile 100 (see FIG. 7), the arrangement direction is arbitrary, but the bulging portion 32b (area 1202) having the smaller axial drag force. It is more desirable to place the on the bumper side.
　以上示した通り、この実施の形態４においては、軸抗力や衝撃エネルギー吸収効率が異なる複数種類（ここでは二種類）の区域をエネルギー吸収部材４１に設けることにより、初期荷重のピーク値を抑え、乗員にかかる障害値を小さくしながら、且つ小型でエネルギー吸収効率が高く、エネルギー吸収の度合いを自在に調節できるエネルギー吸収部材４１を得ることができる。 As described above, in the fourth embodiment, the peak value of the initial load is suppressed by providing the energy absorbing member 41 with a plurality of types (here, two types) of regions having different axial drag and impact energy absorption efficiency. It is possible to obtain an energy absorbing member 41 that is small in size, has high energy absorption efficiency, and can freely adjust the degree of energy absorption while reducing the obstacle value applied to the occupant.
　なお、この実施の形態４において、エネルギー吸収部材を多角形としても良い点、内部に仕切り部材を設けてもよい点、両端に板材を設けて密閉しても良い点、内部にウレタン等の充填材を設けても良い点等は、上記実施の形態１と同様である。 In the fourth embodiment, the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the interior is filled with urethane or the like The point etc. which may provide a material are the same as that of the said Embodiment 1. FIG.
　＜発明の実施の形態５＞
　この発明の実施の形態５のエネルギー吸収部材も、自動車１００のバンパの衝撃を吸収するために使用される（図７参照）。 <Embodiment 5 of the Invention>
The energy absorbing member according to Embodiment 5 of the present invention is also used to absorb the impact of the bumper of automobile 100 (see FIG. 7).
　図１６Ａ及び図１６Ｂは、この実施の形態５に係るエネルギー吸収部材５１の構成を示す概念図であり、図１６Ａは平面図、図１６Ｂは図１６ＡのＨ－Ｈ断面図である。 16A and 16B are conceptual diagrams showing the configuration of the energy absorbing member 51 according to the fifth embodiment, where FIG. 16A is a plan view and FIG. 16B is a cross-sectional view taken along the line HH in FIG. 16A.
　この実施の形態５に係るエネルギー吸収部材５１では、円筒の軸方向に沿って、２個の区域１６０１，１６０２が設定されている。そして、これらの区域１６０１，１６０２には、形状の異なる膨出部５２ａ，５２ｂが形成されている。具体的には、区域１６０１には、平面視が六角形で小寸法の膨出部５２ａが形成され、また、区域１６０２には、平面視が六角形で大寸法の膨出部５２ｂが形成されている。図１６Ｂに示したように、膨出部５２ａ，５２ｂは、エネルギー吸収部材５１の内側に膨出しており、且つ、膨出部５２ａの方が膨出部５２ｂよりも深く形成されている。但し、膨出部５２ａ，５２ｂの深さは同じであっても良い。膨出部５２ａ，５２ｂの立体的な形状は、上述の実施の形態１と同様である。膨出部５２ａ，５２ｂは、例えばプレス加工等によって形成することができる。 In the energy absorbing member 51 according to the fifth embodiment, two areas 1601 and 1602 are set along the axial direction of the cylinder. In these areas 1601 and 1602, bulged portions 52a and 52b having different shapes are formed. Specifically, a bulge portion 52a having a hexagonal shape and a small size is formed in the area 1601, and a bulge portion 52b having a large size and a hexagonal shape in plan view is formed in the area 1602. ing. As shown in FIG. 16B, the bulging portions 52a and 52b bulge inside the energy absorbing member 51, and the bulging portion 52a is formed deeper than the bulging portion 52b. However, the bulging portions 52a and 52b may have the same depth. The three-dimensional shape of the bulging portions 52a and 52b is the same as that in the first embodiment. The bulging portions 52a and 52b can be formed by, for example, pressing.
　他の構成は、上述の実施の形態４と同様である。 Other configurations are the same as those in the fourth embodiment.
　なお、区域１６０１，１６０２の長さ（軸１７方向の長さ）が特に限定されない点も、上述の実施の形態４と同じである。 Note that the length of the areas 1601 and 1602 (the length in the direction of the axis 17) is not particularly limited, which is the same as in the fourth embodiment.
　この実施の形態５によれば、上述の実施の形態４と同様、軸方向の衝撃が加わった場合の軸抗力や衝撃エネルギー吸収量は、区域１６０１と区域１６０２とで異なる大きさになる。 According to the fifth embodiment, as in the above-described fourth embodiment, the axial drag and the impact energy absorption amount when an axial impact is applied are different in the area 1601 and the area 1602.
　このため、この実施の形態５によれば、膨出部の大きさが一定の場合と比較して、衝突初期のピーク反力を低く抑えることができるとともに、衝突初期後の反力を非常に低く且つ安定したものとすることができる。 For this reason, according to the fifth embodiment, the peak reaction force at the initial stage of the collision can be kept low as compared with the case where the size of the bulging portion is constant, and the reaction force after the initial stage of the collision is greatly reduced. It can be low and stable.
　従って、この実施の形態５においては、軸抗力や衝撃エネルギー吸収効率が異なる複数種類（ここでは二種類）の区域をエネルギー吸収部材４１に設けることにより、初期荷重のピーク値を抑え、乗員にかかる障害値を小さくしながら、且つ小型でエネルギー吸収効率が高く、エネルギー吸収の度合いを自在に調節できるエネルギー吸収部材５１を得ることができる。 Therefore, in the fifth embodiment, by providing the energy absorbing member 41 with a plurality of types (two types in this case) of areas having different axial drag and impact energy absorption efficiency, the peak value of the initial load is suppressed and the occupant is affected. It is possible to obtain the energy absorbing member 51 that is small in size, has high energy absorption efficiency, and can freely adjust the degree of energy absorption while reducing the obstacle value.
　なお、この実施の形態５において、エネルギー吸収部材を多角形としても良い点、内部に仕切り部材を設けてもよい点、両端に板材を設けて密閉しても良い点、内部にウレタン等の充填材を設けても良い点等は、上記実施の形態１と同様である。 In the fifth embodiment, the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the inside is filled with urethane or the like The point etc. which may provide a material are the same as that of the said Embodiment 1. FIG.
　＜発明の実施の形態６＞
　この発明の実施の形態６のエネルギー吸収部材も、自動車１００のバンパの衝撃を吸収するために使用される（図７参照）。 <Sixth Embodiment of the Invention>
The energy absorbing member according to Embodiment 6 of the present invention is also used to absorb the impact of the bumper of automobile 100 (see FIG. 7).
　図１７Ａ及び図１７Ｂは、この実施の形態６に係るエネルギー吸収部材６１の構成を示す概念図であり、図１７Ａは平面図、図１７Ｂは図１７ＡのＩ－Ｉ断面図である。 FIGS. 17A and 17B are conceptual diagrams showing the configuration of the energy absorbing member 61 according to Embodiment 6, FIG. 17A is a plan view, and FIG. 17B is a cross-sectional view taken along the line II of FIG. 17A.
　この実施の形態６に係るエネルギー吸収部材６１では、円筒の軸方向に沿って、２個の区域１７０１，１７０２が設定されている。そして、これらの区域１７０１，１７０２には、異なる膨出部６２ａ，６２ｂが形成されている。具体的には、区域１７０１には小寸法の膨出部６２ａが形成され、また、区域１７０２には大寸法の膨出部６２ｂが形成されている。 In the energy absorbing member 61 according to the sixth embodiment, two areas 1701 and 1702 are set along the axial direction of the cylinder. In these areas 1701 and 1702, different bulging portions 62a and 62b are formed. Specifically, a small-size bulge 62a is formed in the area 1701, and a large-size bulge 62b is formed in the area 1702.
　図１７Ａ及び図１７Ｂから解るように、膨出部６２ａ，６２ｂの形状は、実施の形態２に係る膨出部２２と略同様である。なお、この実施の形態６では、第二の稜線２５，２５の両端部及び谷線２６の両端部を外周線２３に接合させて形成したが、第二の稜線２５，２５の両端部及び谷線２６の両端部を外周線２３から離間させてもよい。 As can be seen from FIGS. 17A and 17B, the shapes of the bulging portions 62a and 62b are substantially the same as those of the bulging portion 22 according to the second embodiment. In the sixth embodiment, both ends of the second ridge lines 25 and 25 and both ends of the valley line 26 are joined to the outer peripheral line 23. However, both ends and valleys of the second ridge lines 25 and 25 are formed. Both ends of the line 26 may be separated from the outer peripheral line 23.
　図１７Ｂに示したように、膨出部６２ａ，６２ｂは、エネルギー吸収部材６１の内側に膨出している。図１７Ｂの例では、膨出部６２ａ，６２ｂの深さは略同じであるが、膨出部６２ａの方が膨出部６２ｂよりも深く形成されてもよい。膨出部６２ａ，６２ｂは、例えばプレス加工等によって形成することができる。 As shown in FIG. 17B, the bulging portions 62 a and 62 b bulge inside the energy absorbing member 61. In the example of FIG. 17B, the depths of the bulging portions 62a and 62b are substantially the same, but the bulging portion 62a may be formed deeper than the bulging portion 62b. The bulging portions 62a and 62b can be formed by, for example, pressing.
　他の構成は、上述の実施の形態５と同様である。 Other configurations are the same as those in the fifth embodiment.
　なお、区域１７０１，１７０２の長さ（軸１７方向の長さ）が特に限定されない点も、上述の実施の形態４と同じである。 Note that the lengths of the areas 1701 and 1702 (the length in the direction of the axis 17) are not particularly limited, which is the same as in the fourth embodiment.
　この実施の形態６によれば、上述の実施の形態４と同様、軸方向の衝撃が加わった場合の軸抗力や衝撃エネルギー吸収量は、区域１７０１と区域１７０２とで異なる大きさになる。 According to the sixth embodiment, as in the above-described fourth embodiment, the axial drag and the impact energy absorption amount when an axial impact is applied are different in the area 1701 and the area 1702.
　このため、この実施の形態５によれば、膨出部の大きさが一定の場合と比較して、衝突初期のピーク反力を低く抑えることができるとともに、衝突初期後の反力を非常に低く且つ安定したものとすることができる。。 For this reason, according to the fifth embodiment, the peak reaction force at the initial stage of the collision can be kept low as compared with the case where the size of the bulging portion is constant, and the reaction force after the initial stage of the collision is greatly reduced. It can be low and stable. .
　従って、この実施の形態６においては、軸抗力や衝撃エネルギー吸収効率が異なる複数種類（ここでは二種類）の区域をエネルギー吸収部材４１に設けることにより、初期荷重のピーク値を抑え、乗員にかかる障害値を小さくしながら、且つ小型でエネルギー吸収効率が高く、エネルギー吸収の度合いを自在に調節できるエネルギー吸収部材６１を得ることができる。 Therefore, in the sixth embodiment, by providing the energy absorbing member 41 with a plurality of types (two types in this case) of areas having different axial drag and impact energy absorption efficiency, the peak value of the initial load is suppressed and the passenger is applied to the occupant. It is possible to obtain the energy absorbing member 61 that is small in size, has high energy absorption efficiency, and can freely adjust the degree of energy absorption while reducing the obstacle value.
　なお、この実施の形態６において、エネルギー吸収部材を多角形としても良い点、内部に仕切り部材を設けてもよい点、両端に板材を設けて密閉しても良い点、内部にウレタン等の充填材を設けても良い点等は、上記実施の形態１と同様である。 In the sixth embodiment, the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the interior is filled with urethane or the like The point etc. which may provide a material are the same as that of the said Embodiment 1. FIG.
　＜発明の実施の形態７＞
　この発明の実施の形態７のエネルギー吸収部材（図示せず）も、自動車１００のバンパの衝撃を吸収するために使用される（図７参照）。 <Seventh Embodiment of the Invention>
The energy absorbing member (not shown) of Embodiment 7 of the present invention is also used to absorb the bumper impact of automobile 100 (see FIG. 7).
　このエネルギー吸収部材（図示せず）は、膨出部（図示せず）の形状が、実施の形態４乃至６と異なる。具体的には、この実施の形態７の膨出部（図示せず）は、平面視が円形となるように形成されている。それ以外は実施の形態４乃至７と同じである。 This energy absorbing member (not shown) is different from Embodiments 4 to 6 in the shape of the bulging portion (not shown). Specifically, the bulging portion (not shown) of the seventh embodiment is formed so as to be circular in plan view. The rest is the same as in the fourth to seventh embodiments.
　これにより、エネルギー吸収部材（図示せず）の外部の多方向から加わった衝撃に対する抗力を高くできる。 This makes it possible to increase the resistance to an impact applied from multiple directions outside the energy absorbing member (not shown).
　なお、膨出部の形状は、平面視楕円形でもよい。 In addition, the shape of the bulging portion may be an elliptical shape in plan view.
　なお、この実施の形態７において、エネルギー吸収部材を多角形としても良い点、内部に仕切り部材を設けてもよい点、両端に板材を設けて密閉しても良い点、内部にウレタン等の充填材を設けても良い点等は、上記実施の形態１と同様である。 In the seventh embodiment, the energy absorbing member may be polygonal, the partition member may be provided inside, the plate member may be provided at both ends and sealed, and the inside is filled with urethane or the like The point etc. which may provide a material are the same as that of the said Embodiment 1. FIG.
　以上説明した各実施の形態では、それぞれの膨出部が隣接する構成としたが、膨出部同士が近接し、それぞれの膨出部同士の間に間隙部が形成される（即ち、膨出部同士の間に板状部材本来の平面が残存する構成）であってもよい。 In each of the embodiments described above, the bulging portions are adjacent to each other. However, the bulging portions are close to each other, and a gap is formed between the bulging portions (that is, the bulging portions). The configuration in which the original flat surface of the plate-like member remains between the portions may be employed.
　また、上記各実施の形態では、エネルギー吸収部材を自動車１００のサイドメンバ１０２とバンパ補強部材１０４との間に設ける構成としたが、本発明のエネルギー吸収部材を車体の他の部位に設けることもできる。また、本発明のエネルギー吸収部材を、自動車以外のものに適用することもできる。 In each of the above embodiments, the energy absorbing member is provided between the side member 102 of the automobile 100 and the bumper reinforcing member 104. However, the energy absorbing member of the present invention may be provided at another part of the vehicle body. it can. In addition, the energy absorbing member of the present invention can be applied to things other than automobiles.
　上記各実施の形態は本発明の例示であり、本発明が上記各実施の形態に限定されることを意味するものではないことは、いうまでもない。 The above embodiments are examples of the present invention, and it is needless to say that the present invention is not limited to the above embodiments.
　１１，２１，４１，５１，６１　エネルギー吸収部材
　１３，２２　膨出部
　２４　稜線（第一の稜線）
　２６　谷線
　１０２　サイドメンバ（車体強度部材）
　１０４　バンパ補強材 11, 21, 41, 51, 61 Energy absorbing member 13, 22 bulging portion 24 ridge line (first ridge line)
26 Valley line 102 Side member (body strength member)
104 Bumper reinforcement

Claims (7)

  1. 　筒型の外形を有し、該筒の軸方向に座屈することによって該軸方向に加わった衝撃エネルギーを吸収するエネルギー吸収部材であって、
    　前記筒の側面に、複数の膨出部が、相互に隣接又は近接した状態で形成されており、且つ、
    　該膨出部は、前記筒の内方に向かって突出された、
    　ことを特徴とするエネルギー吸収部材。     An energy absorbing member that has a cylindrical outer shape and absorbs impact energy applied in the axial direction by buckling in the axial direction of the cylinder,
    A plurality of bulges are formed on the side surface of the cylinder in a state adjacent to or close to each other, and
    The bulging portion protrudes inward of the cylinder,
    An energy absorbing member characterized by that.
  2. 　前記膨出部は、外形が正面視で略多角形となるように形成されたことを特徴とする請求項１に記載のエネルギー吸収部材。 The energy absorbing member according to claim 1, wherein the bulging portion is formed so that an outer shape thereof is substantially polygonal when viewed from the front.
  3. 　前記膨出部は、外縁形状が正面視で矩形となるように形成され、一方の対角線に沿って稜線が形成されると共に、他方の対角線に沿って谷線が形成されたことを特徴とする請求項１に記載のエネルギー吸収部材。 The bulging portion is formed such that an outer edge shape is rectangular in a front view, a ridge line is formed along one diagonal line, and a valley line is formed along the other diagonal line. The energy absorbing member according to claim 1.
  4. 　前記膨出部は、外形が正面視で略円形となるように形成されたことを特徴とする請求項１に記載のエネルギー吸収部材。 2. The energy absorbing member according to claim 1, wherein the bulging portion is formed so that an outer shape thereof is substantially circular when viewed from the front.
  5. 　前記軸方向に沿って並ぶ複数の区域毎に前記膨出部の形状を異ならせることによって、これらの区域毎に、前記軸方向に加わった前記衝撃エネルギーの吸収量を異なる大きさに設定したことを特徴とする請求項１乃至４の何れか一つに記載のエネルギー吸収部材 By making the shape of the bulging portion different for each of a plurality of areas arranged along the axial direction, the absorption amount of the impact energy applied in the axial direction is set to a different size for each of the areas. The energy absorbing member according to any one of claims 1 to 4, wherein
  6. 　前記側面の全域にわたって、前記膨出部が隙間なく隣接して形成されたことを特徴とする請求項１乃至５の何れか一つに記載のエネルギー吸収部材。 6. The energy absorbing member according to any one of claims 1 to 5, wherein the bulging portion is formed adjacent to the entire side surface without a gap.
  7. 　自動車の車体強度部材と車幅方向に沿うバンパ補強部材との間に配設されることを特徴とする請求項１乃至６の何れか一つに記載のエネルギー吸収部材。 The energy absorbing member according to any one of claims 1 to 6, wherein the energy absorbing member is disposed between a body strength member of an automobile and a bumper reinforcing member along a vehicle width direction.
PCT/JP2012/061940 2011-05-10 2012-05-10 Energy absorption member WO2012153792A1 (en)

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