WO2021201291A1 - 衝撃吸収部材 - Google Patents

衝撃吸収部材 Download PDF

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Publication number
WO2021201291A1
WO2021201291A1 PCT/JP2021/014397 JP2021014397W WO2021201291A1 WO 2021201291 A1 WO2021201291 A1 WO 2021201291A1 JP 2021014397 W JP2021014397 W JP 2021014397W WO 2021201291 A1 WO2021201291 A1 WO 2021201291A1
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WO
WIPO (PCT)
Prior art keywords
plate
shock absorbing
absorbing member
portions
clearance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/014397
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English (en)
French (fr)
Japanese (ja)
Inventor
俊太郎 松山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to CN202180015739.8A priority Critical patent/CN115135900B/zh
Priority to JP2022511167A priority patent/JP7417158B2/ja
Priority to US17/916,316 priority patent/US12103445B2/en
Publication of WO2021201291A1 publication Critical patent/WO2021201291A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42709—Seats or parts thereof displaced during a crash involving residual deformation or fracture of the structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • 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
    • 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

Definitions

  • the present invention relates to a shock absorbing member.
  • Patent Document 1 describes an impact absorbing member that absorbs impact energy while continuously causing bending deformation due to a collision load and reducing the maximum load at that time with a small load amplitude. ing.
  • the impact absorbing member described in Patent Document 1 is composed of a cylindrical body, and absorbs impact energy by continuously causing bending deformation in which the length of the folded portion where the outer wall is folded back increases due to an impact load. do.
  • the shock absorbing member has a three-dimensional structure with a closed cross section, and the three-dimensional occupied space becomes large. Therefore, if a sufficient space cannot be secured, there is a problem that the shock absorbing member cannot be arranged.
  • an object of the present invention is to provide a shock absorbing member capable of absorbing energy at the time of a collision in a smaller space.
  • the gist of this disclosure is as follows.
  • a plate material having a bent portion and a plurality of plate portions connected via the bent portion A restraining member that restrains the plurality of plate portions, With The plurality of plate portions are overlapped in a state of being folded back in the first direction at the bent portion.
  • the restraining member restrains the plurality of overlapping plate portions from both sides in the second direction.
  • the first direction is a direction connecting one end of the two ends of the plate material and the bent portion adjacent to the plate on which the end is located.
  • the second direction is a direction orthogonal to the first direction. Shock absorbing member.
  • the restraining member is a hollow member.
  • the plurality of overlapping plate portions are arranged in the hollow member.
  • the plate material has two bent portions and three plate portions connected via the two bent portions.
  • the three plate portions are superimposed on the two bent portions in a state of being alternately folded back in the first direction.
  • the shock absorbing member according to (1) or (2) above.
  • the second direction is the thickness direction of the plate material.
  • the restraining member has two restraining surfaces that restrain the plurality of overlapping plate portions in the second direction.
  • the clearance c which is the average value with the clearance, satisfies the following equation (1).
  • the plate portion located in the middle in the second direction has a length of l 0 in the first direction, and at the bent portion, the curvature of the plate thickness center line of the plate portion connected to the bent portion.
  • c * l 0 / 2-r
  • the second direction is the thickness direction of the plate material.
  • the clearance c'between the inner surfaces of the plate portions facing the second direction in the plurality of overlapping plate portions is t, where the average plate thickness of the overlapping plate portions in the second direction is t.
  • One of both ends of the plate material is connected to a hinge portion that supports the seat back of the vehicle seat, and the other is connected to the side frame of the seat cushion.
  • the shock absorbing member according to any one of (1) to (5) above.
  • a shock absorbing member capable of absorbing energy at the time of a collision in a smaller space.
  • FIG. 1 is a schematic view showing the configuration of a vehicle seat 100.
  • the vehicle seat 100 is used, for example, as a driver's seat or a passenger seat.
  • the vehicle seat 100 has a seat cushion 50 as a seating portion and a seat back 60 as a backrest.
  • the seat cushion 50 is supported on the floor via a pair of left and right slide rails (not shown) installed on the floor of the vehicle.
  • FIG. 1 schematically shows a skeleton portion of a vehicle seat 100 having a seat cushion 50 and a seat back 60.
  • the vehicle seat 100 is configured by adding an inclusion material such as a sponge and an exterior material such as leather or cloth to these configurations.
  • the seat cushion 50 has side frames 102 and side frames 104 provided on the left and right sides.
  • the side frame 102 and the side frame 104 are connected and integrated by a connecting member 110, a connecting member 112, and a connecting member 114 extending in the vehicle width direction.
  • the seat back 60 has side frames 106 and side frames 108 provided on the left and right sides.
  • the side frame 106 and the side frame 108 are connected and integrated by a connecting member 116 and a connecting member 118 extending in the vehicle width direction.
  • the seat cushion 50 and the seat back 60 are connected by the left and right hinge portions 70 and the hinge portions 80.
  • the angle of the seat back 60 with respect to the seat cushion 50 can be changed with the hinge portions 70 and 80 as fulcrums.
  • the reclining function of the vehicle seat 100 is realized.
  • the structures of the hinge portion 70 and the hinge portion 80 are different. Taking the case where the vehicle seat 100 is the seat on the driver's side of a right-hand drive vehicle as an example, in the hinge portion 70 on the right side when facing the front of the vehicle, the axis 72 extending in the vehicle width direction is used as the rotation center.
  • the side frame 108 of the seat back 60 is configured to be rotatable with respect to the side frame 104 of the seat cushion 50.
  • the side frame 106 of the seat back 60 is connected to the side frame 102 of the seat cushion 50 via the shock absorbing member 10.
  • the shock absorbing member 10 is configured to be rotatable with respect to the side frame 102 of the seat cushion 50 with the shaft 82 extending in the vehicle width direction as the center of rotation.
  • the side frame 106 of the seat back 60 can be rotated with respect to the shock absorbing member 10 with the shaft 84 extending in the vehicle width direction as the center of rotation.
  • one of both ends of the plate member 12 is connected to the hinge portion supporting the seat back 60 of the vehicle seat 100, and the other is connected to the side frame 102 of the seat cushion 50.
  • a reclining device (not shown) for adjusting the angle of the seat back 60 is provided only on the hinge portion 70 on the right side when facing the front of the vehicle.
  • the reclining device includes, for example, a latch mechanism, and fixes the angle of the side frame 108 of the seat back 60 with respect to the side frame 104 of the seat cushion 50 to an angle adjusted by the user. Since the side frame 106 and the side frame 108 are integrated by the connecting member 116 and the connecting member 118, when the angle of the side frame 108 with respect to the side frame 104 is fixed by one of the hinge portions 70, the side frame with respect to the side frame 102 The angle of 106 is also fixed. As a result, the angle of the seat back 60 with respect to the seat cushion 50 is fixed.
  • the reclining device only on one hinge portion 70, the number of parts is reduced and the manufacturing cost is reduced.
  • FIG. 2 is a perspective view showing the configuration of the shock absorbing member 10.
  • FIG. 14 is a cross-sectional view showing the configuration of the shock absorbing member 10.
  • the shock absorbing member 10 includes a plate material 12 having a bent portion 12a and a plurality of plate portions 12b connected via the bent portion 12a. The plurality of plate portions 12b are superimposed on the bent portion 12a in a state of being folded back in the first direction.
  • the shock absorbing member 10 includes a restraining member 14 that restrains a plurality of overlapping plate portions 12b from both sides in the second direction.
  • the first direction is a direction connecting one end 12c of the two end 12c of the plate member 12 and the bent portion 12a adjacent to the plate 12b where the end 12c is located.
  • the direction connecting the other end portion 12c of the plate member 12 and the bent portion 12a adjacent to the plate portion 12b where the end portion 12c is located coincides with the first direction.
  • the first direction is designed to coincide with the direction in which the impact load, which will be described later, is expected to be applied.
  • the second direction is a direction orthogonal to the first direction.
  • the second direction preferably includes the thickness direction and the width direction of the plate member 12 (plate portion 12b).
  • the thickness direction of the plate member 12 (plate portion 12b) indicates a normal direction (also referred to as a direction orthogonal to the surface) of the plate portion 12b with respect to the plate surface.
  • the width direction of the plate member 12 corresponds to the plate width direction of the plate portion 12b, and indicates a direction orthogonal to the first direction and the thickness direction.
  • the restraining member 14 efficiently transmits the impact load applied to the end portion 12c of the plate member 12 in the first direction.
  • the plate portion 12b has a planar shape, the restraint of the plate portion 12b with respect to the thickness direction in which the plate portion 12b is easily deformed is effective for absorbing the impact load.
  • "constraining the plate portion 12b from both sides in the second direction” means limiting the amount of movement of the plate portion 12b in the second direction.
  • the restraint member 14 and the plate portion 12b may be in close contact with each other in the second direction or may be in close contact with each other.
  • the distance between the restraint member 14 and the plate portion 12b in the second direction is preferably within the distance described later in order to efficiently absorb the impact load.
  • FIG. 14 shows a cross section of the shock absorbing member 10 along the first direction.
  • the vehicle is equipped with various shock absorbing structures to absorb the shock at the time of a collision.
  • various shock absorbing structures to absorb the shock at the time of a collision.
  • a member such as a front side member constituting a vehicle body floor
  • the space for providing the shock absorbing structure is very limited. Therefore, the size of the shock absorbing member 10 provided on the vehicle seat 100 is preferably as small as possible.
  • the shock absorbing member 10 is composed of a plate member 12 that is bent and stacked.
  • the plate thickness of the bent portion 12a or the plate portion 12b of the plate material 12 is about several millimeters. Therefore, the occupied space of the shock absorbing member 10 is suppressed, and in particular, the occupied space in the plate thickness direction is suppressed. Therefore, the shock absorbing member 10 can be arranged even in a narrow gap or the like, and can be reliably incorporated even in the vehicle seat 100 in which only a limited space can be secured.
  • the plate material 12 is formed by bending a strip-shaped steel plate at two bent portions 12a and stacking the steel plates in three layers.
  • the strip-shaped steel plates (plate portions 12b) on which the plate members 12 are stacked may be in close contact with each other, or a predetermined clearance may be provided between the stacked plate portions 12b as described later.
  • the number of bent portions 12a may be 1 or more. If there is only one bent portion 12a, the plate member 12 is formed by doubly stacking the plate portions 12b. Further, if there are three bent portions 12a, the plate member 12 is formed by stacking the plate portions 12b in four layers.
  • the plate material 12 may be made of a metal plate other than the steel plate.
  • the restraint member 14 is made of a hollow member such as a steel pipe, and is formed by, for example, cutting a square pipe short in the longitudinal direction.
  • the restraint member 14 may be formed into a hollow shape by bending a plate material, and in that case, the bent ends may be joined by welding or the like, or the ends may not be joined but the ends may be joined to each other. A gap may be provided between the two.
  • three overlapping plate portions 12b are arranged. As shown in FIGS. 2 and 14, the restraining member 14 has two restraining surfaces 14a that restrain the three overlapping plate portions 12b in the second direction (thickness direction of the plate portions 12b).
  • the distance D between the two restraint surfaces 14a facing each other inside the restraint member 14 is about three times the average plate thickness t of the three plate portions 12b. It is preferable that the end portion 12c of the plate member 12 is provided with a hole 18 into which the shaft 82 is inserted and a hole 16 into which the shaft 84 is inserted. If there is only one bent portion 12a, the plate member 12 is formed by overlapping the two plate portions 12b, so that the distance D between the two restraint surfaces 14a facing each other inside the restraint member 14 is 2. It is about twice the average plate thickness t of the two plate portions 12b.
  • the plate material 12 is formed by stacking four plate portions 12b, so that the distance D between the restraint surfaces 14a facing each other inside the restraint member 14 is four. It is about four times the average plate thickness t of the plate portion 12b.
  • the restraint surface 14a of the restraint member 14 and the outer surface of the plate member 12 may be in close contact with each other, or a predetermined clearance may be provided as described later.
  • the restraining member 14 restrains a plurality of overlapping plate portions 12b from both sides in the second direction orthogonal to the first direction, and restrains the plate portions 12b from both sides in the thickness direction of the plate material 12.
  • the plate portion 12b may be restrained from both sides in the width direction of the plate material 12.
  • the restraint member 14 and the plate material 12 are fixed by spot welding or the like in order to prevent the restraint member 14 from moving with respect to the plate material 12. You may. However, if the restraint member 14 and the plate material 12 are completely fixed, the deformation of the plate material 12 may be hindered when an impact load is input. Therefore, the restraint member 14 and the plate material 12 are not fixed to each other. It is preferable that the strength is low enough to break when an impact load is applied to the impact absorbing member 10.
  • a 3-point seat belt device (not shown) is built in the seat back 60.
  • the seat belt When the seat belt is used, the occupant's body is fixed to the seat back 60 by the seat belt. Therefore, when the vehicle collides (front collision) when the seat belt is used, a large impact load (inertial force) is input to the seat back 60 in the direction indicated by the arrow A1 in FIG.
  • the three-point seat belt device As a configuration in which the three-point seat belt device is built in the seat back 60, for example, the configuration described in Japanese Patent Application Laid-Open No. 2012-76494 can be applied.
  • FIG. 3 is a side view of the vehicle seat 100 viewed from the left side, showing a state in which a large load is input to the seat back 60 in the direction of arrow A1 due to the front collision of the vehicle, and the seat back 60 is deformed to the front of the vehicle. It is a figure.
  • the angle of the side frame 108 of the seat back 60 with respect to the side frame 104 of the seat cushion 50 is fixed by the reclining device. Therefore, the angle of the side frame 108 with respect to the side frame 104 basically does not change significantly, although it depends on the magnitude of the input load. Therefore, a large acceleration is generated in the side frame 108 at the time of front collision.
  • the angle of the side frame 108 with respect to the side frame 104 may change due to the stopper riding on the latch mechanism or the like.
  • the angle of the side frame 106 of the seat back 60 with respect to the side frame 102 of the seat cushion 50 is not fixed at the hinge portion 80 on the left side when facing the front of the vehicle. Therefore, when a load is input in the direction of the arrow A1, the angle of the side frame 106 with respect to the side frame 102 changes significantly. Further, when an impact load is input in the direction of arrow A1, an impact load is applied in the direction in which the shaft 82 and the shaft 84 are separated from each other (in the direction of arrow A2 shown in FIG. 3), and the first shock absorbing member 10 is loaded. A tensile load is applied in the direction.
  • the shaft 82 and the shaft 84 are inserted into the holes 16 and 18 of the end portion 12c of the plate material 12, respectively, and the shock absorbing member 10 is connected to other members.
  • the method of connecting the end portion of the absorbing member 10 and the other member is not limited to this, and may be connected by welding, for example.
  • FIG. 4 is a schematic view showing a state in which the hinge portion 80 is viewed in the direction of arrow A3 in FIG.
  • the shaft 84 is inserted into one hole 16 of the shock absorbing member 10, so that the shaft 84 is inserted into the plate member 12 in the arrow A2 direction.
  • the power of is transmitted.
  • a shaft 82 is inserted into the other hole 18 of the shock absorbing member 10, and the shaft 82 is fixed to the side frame 102. Therefore, a force acts in the direction in which the shaft 82 and the shaft 84 are separated from each other, and a tensile load of the shock absorbing member 10 is applied.
  • FIGS. 5A to 5C are schematic views showing in chronological order how the shock absorbing member 10 is deformed by receiving a tensile load when the number of bent portions 12a is two.
  • the bent portion 12a and the plate portion 12b of the plate member 12 are shown from the width direction of the plate member 12, and the plate portion 12b located in the middle of the three plate portions 12b is in the first direction.
  • the length L is shown.
  • FIG. 5A shows a state in which a tensile load starts to be input in the first direction of the shock absorbing member 10. From this state, the shock absorbing member 10 starts absorbing the collision energy. In the state shown in FIG.
  • the outer surfaces of the two bent portions 12a of the plate member 12 are located outside the restraint member 14.
  • the length L of the plate portion 12b located in the middle of the three plate portions 12b is about the same as the length of the restraint member 14.
  • FIG. 5B shows a state in which the plate material 12 is deformed due to the tensile load being input in the first direction of the shock absorbing member 10.
  • the two bent portions 12a of the plate member 12 shown in FIG. 5A are stretched, and the outer surface of the newly formed bent portion 12a'is inside the restraint member 14.
  • the length L of the plate portion 12b located in the middle of the three plate portions 12b is shorter than the length of the restraint member 14.
  • FIG. 5C shows a state in which the plate material 12 is further deformed from the state shown in FIG. 5B due to the tensile load being input in the first direction of the shock absorbing member 10.
  • the two bent portions 12a'of the plate member 12 shown in FIG. 15B are stretched, and the position of the newly formed bent portion 12a'" is further higher than that of the bent portion 12a'of FIG. 5B. It's inside.
  • the length L of the plate portion 12b located in the middle of the three plate portions 12b is further shorter than that of FIG. 5B.
  • the plate material 12 of the shock absorbing member 10 is stretched, and the plate material 12 overlaps due to folding back (intermediate among the three plate portions 12b).
  • the length L of the plate portion 12b) located at is reduced.
  • the two bent portions are stretched, a new bent portion is formed adjacent to the original bent portion, and this is repeated, so that the two bent portions are restrained members in the first direction of the plate member 12. Move each other towards the interior of 14.
  • the deformation of the plate material 12 propagates in the first direction and the deformation spreads over the entire area of the plate material 12, the deformation of the bent portion in the out-of-plane direction (thickness direction of the plate material 12) is suppressed.
  • the lower limit of the length L of the plate portion 12b located in the middle of the three plate portions 12b is the distance at which the bent portion can move in the first direction.
  • the distance D between the two restraint surfaces 14a facing each other inside the restraint member 14 is about three times the average plate thickness t of the plurality of plate portions 12b, and the plate material 12 In the thickness direction, the plate member 12 and the restraint member 14 are in a fitted state. Due to this mating state, in the process in which the portion to be bent by the impact load is moved toward the inside of the restraint member 14 in the first direction, the plate members 12 stacked by the restraint member 14 are thickened. Deformation in the direction (direction of arrow A4 shown in FIGS. 5A to 5C) is suppressed.
  • the plate member 12 is not deformed so as to spread in the thickness direction, and the two bent portions are deformed so as to move toward the inside of the restraining member 14 in the first direction.
  • the tensile load applied to the shock absorbing member 10 in the first direction is surely absorbed.
  • FIG. 6A and 6B are schematic views for explaining how the plate member 12 is deformed when a tensile load is applied to the first direction of the shock absorbing member 10 when the restraining member 14 is not provided. be.
  • FIG. 6A shows the moment generated when the tensile load F is input in the first direction
  • FIG. 6B shows how the plate material 12 is deformed when the tensile load F is input to the plate material 12.
  • the restraint member 14 has enough strength to suppress the occurrence of the deformation shown in FIG. 6B.
  • FIGS. 13A and 13B show in more detail how the plate member 12 is deformed when a tensile load is applied to the first direction of the shock absorbing member 10 when the restraining member 14 is provided. It is a figure.
  • FIG. 13A shows the moment generated when the tensile load F is input in the first direction of the shock absorbing member 10
  • FIG. 13B shows how the plate material 12 is deformed when the tensile load F is input to the plate material 12. Is shown.
  • the bent portion 12a shown in FIG. 15A is stretched in the region R2, and newly adjacent to the original bent portion 12a in the region R3. Bent portion 12a'is formed. In this way, when the original bent portion is stretched, a new bent portion adjacent to the original bent portion is formed, and by repeating this, the deformation propagates so that the bent portion moves. Therefore, the region R1 in which the plate material 12 is not deformed as shown in FIG. 6B does not occur, the reaction force when the impact load is input increases, and the absorbed energy increases.
  • the plate material 12 is used in order to obtain sufficient absorbed energy when an impact load is applied, but if a bar material is used, it is difficult to obtain sufficient absorbed energy. be.
  • FIG. 7 is a characteristic diagram showing the relationship between the stroke and the reaction force when a tensile load is applied to the shock absorbing member 10.
  • the stroke is an amount that the shock absorbing member 10 extends when a tensile load is applied, and the stroke when no tensile load is applied is set to 0.
  • the characteristic C1 (invention example) showing the relationship between the stroke and the reaction force of the shock absorbing member 10 (invention example) according to the present embodiment and the relationship between the stroke and the reaction force of the shock absorbing member 10 (invention example) according to the comparative example.
  • the characteristic C2 showing the above is shown.
  • the shape of the example of the invention is an N-shape having two bent portions, similar to the shock absorbing member 10 shown in FIG. Further, the shape of the comparative example was a simple plate shape without folding back (no bent portion), and the restraining member 14 was not provided in the comparative example.
  • FIG. 8 is a characteristic diagram showing the amount of absorbed energy per volume for each of the invention example and the comparative example described in FIG. 7.
  • the amount of absorbed energy is obtained from the integral value of the reaction force with respect to the stroke.
  • the collision energy is sufficient in the process in which the deformation propagates so that the bent portion moves in the first direction toward the inside of the restraint member 14 in the first direction.
  • the deformation of the plate material 12 propagates so that the bent portion moves in the first direction, the entire area of the plate material 12 is deformed and the amount of energy absorbed per volume increases.
  • the restraint surface 14a of the restraint member 14 and the outer surface of the plate member 12 may be in close contact with each other, or a predetermined clearance may be provided. Further, the plate portions 12b may be in close contact with each other, or a predetermined clearance may be provided between the plate portions 12b as described later. As the clearance between the plate member 12 and the restraint member 14 increases, the amount of rotation of the plate portion 12b inside the restraint member 14 due to the moment M1 described with reference to FIG. 13A increases, and the region R1 in which the plate member 12 shown in FIG. 6B does not deform. Therefore, the reaction force when a tensile load is input decreases.
  • Figure 22 is a plate thickness t, the clearance c, clearance c ', the radius of curvature r, the length l 0 of the bent portion 12a of the plate 12.
  • Figure 22 is a plate thickness t, the clearance c, clearance c ', the radius of curvature r, shows definitions (measurement method) in more detail length l 0 of FIG. 14.
  • mp indicates a plate thickness measuring portion
  • the plate thickness t of the plate material 12 is an average value of the plate thicknesses measured by these six plate thickness measuring portions.
  • Clearance c is in the vicinity of one of the bent portion 12a and the plate portion 12b and the clearance c 1 of the portion restraining surface 14a closest of the restraining member 14, in the vicinity of the other bent portion 12a and the plate portion 12b of the restraining member 14 It is an average value with the clearance c 2 of the portion where the restraint surface 14a is closest to the restraint surface 14a, and corresponds to the clearance between the plate member 12 and the restraint member 14.
  • Clearance c ' includes a plate portion 12b located in the middle of the three plate portions 12b, a clearance c between each of the two plate portions 12b located on both sides' be 1, c' 2 of the mean value , Corresponds to the clearance between the plate portions 12b.
  • the length l 0 is the distance in the first direction between the centers of the inscribed circles inside the bends of the two bent portions 12a, and is the length of the plate portion 12b located in the middle of the three plate portions 12b.
  • Measurement position of the clearance c '1 is preferably apart from the bent portion 12a on the left side of the figure, the plate portion 12b in the right side of the line l c that indicates the half of the position of the length l 0 restraining surface 14a Is the closest part.
  • the measurement position of the clearance c '2 has a plate portion 12b at it is preferable, the left side of the line l c that indicates the half of the position of the length l 0 which is away from the right side of the bent portion 12a in FIG.
  • the restraint surface 14a is the closest portion.
  • the plate thickness measuring unit mp shall be the same location where the clearance c and the clearance c'are measured. In the case of this example, the plate thickness is measured at the same measurement point mp as the clearances c1, c2, c'1, c'2, and the average thereof is defined as the plate thickness t (also referred to as the plate thickness average).
  • the thickness t of the plate 12, a clearance c, clearance c ', the radius of curvature r of the bent portion 12a, each of length l 0 is the position in the width direction half of the shock absorbing member 10 in the first direction Measure the cross section when cut. At this time, if the restraint member 14 and the plate member 12 are not connected, the entire shock absorbing member 10 is fixed with resin.
  • the plate portion 12b falls within the clearance c on the right side of the drawing. Rotate around. Then, when the plate member 12 comes into contact with the restraint member 14, the plate member 12 receives the force f shown in FIG. 13A from the restraint member 14. In this case, until the plate member 12 comes into contact with the restraining member 14, the same deformation as in FIG. 6B occurs, and the reaction force decreases.
  • FIG. 15 is a schematic view showing a limit when the clearance c between the plate member 12 and the restraint member 14 is increased and the plate member 12 and the restraint member 14 come into contact with each other. The clearance c between the plate material 12 and the restraint member 14 is increased, and the clearance c when the state shown in FIG.
  • the clearance c between the plate material 12 and the restraint member 14 should be made smaller than the critical clearance c * , that is, the ratio of the clearance c to the critical clearance c *. It is preferable that c / c * is less than 1.
  • the absorbed energy of the shock absorbing member 10 when a tensile load is input changes according to the ratio c / c *. It was found that the absorbed energy decreased as the ratio c / c * increased. Furthermore, it was found that there is a critical point where the absorbed energy sharply decreases as the ratio c / c * is increased.
  • the ratio c / c * clearance c for the critical clearance c * the relationship between the absorption energy of the shock absorbing member 10 by a characteristic diagram which is calculated by simulation be.
  • the horizontal axis represents the ratio c / c *
  • the vertical axis represents the absorbed energy.
  • Characteristic C3 shown in FIG. 16 a steel plate constituting the plate 12, 1 mm using a cold-rolled steel sheet tensile strength of 1180MPa steel plate having a thickness, the l 0 shown in FIG. 14 and 10 cm, the ratio c / c * The change in absorbed energy when is changed is obtained by simulation.
  • the restraint member 14 was simulated as a rigid fixed object.
  • the absorbed energy decreases as the clearance c increases, that is, as the ratio c / c * increases, but the c / c * increases. It can be seen that when it exceeds 0.3, the rate of decrease in absorbed energy with respect to the increase in the ratio c / c * increases. In other words, it can be seen that the absorbed energy increases as the clearance c becomes smaller, but the absorbed energy saturates when the ratio c / c * is around 0.3. Also, c / c * It can be seen that the reduction rate of the absorbed energy is further increased with respect to the increase in the ratio c / c * exceeds 0.6.
  • the characteristic C4 when l 0 is 20 cm and the characteristic C5 when the thickness of the steel plate constituting the plate material 12 is 2 mm are calculated and plotted. It is a figure.
  • the condition C4 is the same as the characteristic C3 except for l 0
  • the characteristic C5 is the same as the characteristic C3 except for the plate thickness.
  • c / c * also exceeds 0.3 in the characteristic C4 when l 0 is 20 cm and the characteristic C5 when the thickness of the steel plate constituting the plate material 12 is 2 mm. It was found that the decrease rate of absorbed energy increases with the increase of the ratio c / c *. Further, characteristics C4, and also in the characteristic C5, c / c * is the reduction rate of absorbed energy with respect to the increase in the ratio c / c * exceeds 0.6 was found to be even greater.
  • the value of the ratio c / c * is 0.6 or less, and more preferably the ratio c / c. It is preferable that the value of * is 0.3 or less. Further, in order to maximize the absorbed energy, it is preferable that the plate material 12 and the restraining member 14 are brought into close contact with each other with the clearance c set to 0.
  • 18 to 20 show the ratio c'/ t of the clearance c'between the plate portions 12b to the average plate thickness t of the plurality of plate portions 12b and the absorbed energy when a tensile load is applied to the shock absorbing member 10. It is a characteristic diagram which calculated the relationship of. In FIGS. 18 to 20, the horizontal axis represents the ratio c'/ t, and the vertical axis represents the absorbed energy.
  • the characteristic C7 shown in FIG. 19 shows the result of simulating with the plate thickness of the steel plate constituting the plate material 12 as 2 mm
  • the characteristic C8 shown in FIG. 20 shows the plate thickness of the steel plate constituting the plate material 12 as 3 mm. The result of the simulation is shown.
  • the conditions other than the plate thickness were the same as the simulation of the characteristic C6 shown in FIG.
  • the absorbed energy decreases as the clearance c'between the plate portions 12b increases, that is, as the ratio c'/ t increases, but c
  • ′ / t exceeds 0.2
  • the rate of decrease in absorbed energy with respect to the increase in the ratio c ′ / t increases.
  • the absorbed energy increases as the clearance c'is reduced, but the absorbed energy saturates when the ratio c'/ t is around 0.2. Therefore, in order to increase the absorbed energy and enhance the shock absorbing capacity of the shock absorbing member 10, it is preferable that the value of the ratio c'/ t is 0.2 or less. Further, in order to maximize the absorbed energy, it is preferable to set the clearance c'to 0 and bring the plate portions 12b into close contact with each other.
  • r / t is about 0.6 at the radius of curvature r of the plate thickness center line of the bent portion, and the radius of curvature inside the bend of the bent portion. In r, it is preferable that r / t has a bendability of about 0.1.
  • FIGS. 21A and 21B are schematic views for explaining the reason why the decrease rate of absorbed energy with respect to the increase of the ratio c'/ t increases when the value of c'/ t exceeds 0.2.
  • FIG. 21A shows a state before a tensile load is input to the plate material 12
  • FIG. 21B shows a state in which the plate material 12 is deformed when the tensile load F is input to the plate material 12.
  • FIGS. 21A and 21B illustrate the case where c'/ t is larger than 1.
  • the bent portion 12a shown in FIG. 21A is stretched in the region R2, and a new bent portion 12a'is formed in the region R3. ..
  • a new bent portion 12a' is formed in the region R3 separated from the region R2 in which the bent portion 12a is extended, and the region R2 A region R4 in which no bent portion is formed appears between the region R3 and the region R3. That is, when the ratio c'/ t is 0.2 or less, as described with reference to FIG.
  • the ratio c'/ t is 0.2 or less. It is possible to prevent the absorbed energy from decreasing when an impact load is input.
  • the number of bent portions 12a of the shock absorbing member 10 may be 1 or more.
  • FIG. 9 is a schematic view showing a case where the number of bent portions 12a is one.
  • the bent portion 12a is deformed while moving to the right. More specifically, in the configuration shown in FIG. 9, when the plate member 12 receives a tensile load in the direction of arrow A5 from the member 20 connected to the end portion 12d, the plate member 12 receives a tensile load in the direction of arrow A5 from the member 22 connected to the end portion 12e in the direction of arrow A6.
  • the bent portion is deformed in the first direction so as to move to the right in the drawing, and the deformation of the plate member 12 propagates.
  • the plate material 12 since a compressive force is applied to the end portion 12e in the first direction, if the plate material 12 is deformed at the end portion 12e, the absorbed energy when an impact load is applied may not be stable. In particular, when the plate thickness of the steel plate constituting the plate material 12 is thin, or when the cross-sectional area of the end portion 12e is small, the plate material 12 may be deformed at the end portion 12e. Further, when the number of the bent portions 12a is 3 or more, when the plate material 12 is deformed by receiving an impact load, the overlapped portion of the plate material 12 may easily come off from the restraining member 14. Therefore, the number of bent portions 12a is preferably two.
  • FIG. 10 is a schematic view showing an example in which the plate material 12 has the function of the restraint member 14.
  • a U-shaped restraint piece 12f is provided in the width direction of the plate member 12 when viewed from the first direction.
  • the restraint piece 12f is formed by projecting the plate member 12 in the width direction and bending it into a U shape when viewed from the first direction.
  • the number of parts constituting the shock absorbing member 10 is reduced.
  • FIG. 11 is a schematic view showing an example in which the shock absorbing member 10 is arranged in addition to the hinge portion of the vehicle seat 100.
  • the side frame 102 of the seat cushion 50 is divided into an upper side frame 102a and a lower side frame 102b, and the upper side frame 102a and the lower side frame 102b relate to the present embodiment. It is connected by a shock absorbing member 10.
  • the side frame 104 (not shown in FIG. 11) of the seat cushion 50 is also configured in the same manner as the side frame 102. According to such a configuration, by dividing the side frames 102 and 104 of the seat cushion 50, the side frames 102 and 104 are miniaturized, and further weight reduction of the vehicle seat 100 is achieved.
  • the seat back 60 is deformed to the front of the vehicle at the time of a front collision, and the plate member 12 of the impact absorbing member 10 on the rear side of the vehicle extends in the first direction to absorb the collision energy. Further, at the time of a rear collision, the seat back 60 is deformed to the rear of the vehicle, and the plate member 12 of the impact absorbing member 10 on the front side of the vehicle extends in the first direction to absorb the collision energy. Further, at the time of a side collision, the collision energy is absorbed by the plate member 12 of the impact absorbing member 10 on the front side and the rear side of the vehicle extending in the first direction.
  • FIG. 12 is a perspective view showing the vehicle body frame 200, and is a diagram showing an example in which the shock absorbing member 10 according to the present embodiment is applied to the vehicle body regions R11, R12, and R13.
  • a shock absorbing member 10 is provided at a joint portion between the center pillar 210 and the side sill 220.
  • one hole 16 of the shock absorbing member 10 is fixed to the center pillar 210, and the other hole 18 of the shock absorbing member 10 is fixed to the side sill 220 side.
  • the shock absorbing member 10 is applied to the engine mount of the vehicle.
  • one hole 16 of the shock absorbing member 10 is fixed to the engine (not shown), and the other hole 18 is fixed to the vehicle body frame 200.
  • the shock absorbing member 10 is applied to the opening / closing portion of the bonnet.
  • one hole 16 of the shock absorbing member 10 is fixed to the vehicle body frame 200, and the other hole 18 is fixed to a latch component that mechanically engages with the bonnet when the bonnet is closed.
  • the pedestrian's head or body may hit the bonnet and a force may be applied in the direction of pushing down the bonnet.
  • a tensile load is applied to the shock absorbing member 10, and the plate member 12 of the shock absorbing member 10 extends in the first direction to absorb the collision energy. Therefore, the safety of pedestrians is ensured.
  • the shock absorbing member 10 can be arranged even in a place where the space is restricted, it is possible to efficiently absorb the collision energy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Vibration Dampers (AREA)
  • Seats For Vehicles (AREA)
  • Body Structure For Vehicles (AREA)
PCT/JP2021/014397 2020-04-02 2021-04-02 衝撃吸収部材 Ceased WO2021201291A1 (ja)

Priority Applications (3)

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CN202180015739.8A CN115135900B (zh) 2020-04-02 2021-04-02 冲击吸收部件
JP2022511167A JP7417158B2 (ja) 2020-04-02 2021-04-02 衝撃吸収部材
US17/916,316 US12103445B2 (en) 2020-04-02 2021-04-02 Impact absorbing member

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JP2020066976 2020-04-02
JP2020-066976 2020-04-02

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JP2009527398A (ja) * 2006-02-15 2009-07-30 エアバス・ドイチュラント・ゲーエムベーハー 航空機用エネルギー吸収装置
JP2013067238A (ja) * 2011-09-21 2013-04-18 Nhk Spring Co Ltd 車両用シート
JP2017517659A (ja) * 2014-03-18 2017-06-29 マウレール ソーネ エンジニアリング ゲーエムベーハー ウント シーオー カーゲー エネルギー吸収装置

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DE102006007028B3 (de) * 2006-02-15 2007-09-06 Airbus Deutschland Gmbh Kraftniveaueinstellung für einen Energieabsorber für Flugzeuge
DE102006022159C5 (de) * 2006-05-12 2016-05-25 Grammer Ag Passagiersitz für Schienenfahrzeuge, wie Hochgeschwindigkeitszüge
KR100812240B1 (ko) * 2007-01-11 2008-03-10 주식회사 만도 자동차의 충격 흡수식 조향 컬럼
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JP5632147B2 (ja) 2009-10-13 2014-11-26 新日鐵住金株式会社 クラッシュボックス
JP5741473B2 (ja) * 2012-02-10 2015-07-01 トヨタ自動車株式会社 車両用シート及び車両
DE102013204388B4 (de) * 2013-03-13 2015-03-19 Deutsches Zentrum für Luft- und Raumfahrt e.V. Energieabsorptionsvorrichtung und Verwendung derselben in einem Fahrzeug
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JPS4882619U (https=) * 1972-01-12 1973-10-08
EP0673810A2 (en) * 1994-03-21 1995-09-27 Trw Vehicle Safety Systems Inc. Seat belt webbing energy management device
JP2009527398A (ja) * 2006-02-15 2009-07-30 エアバス・ドイチュラント・ゲーエムベーハー 航空機用エネルギー吸収装置
JP2013067238A (ja) * 2011-09-21 2013-04-18 Nhk Spring Co Ltd 車両用シート
JP2017517659A (ja) * 2014-03-18 2017-06-29 マウレール ソーネ エンジニアリング ゲーエムベーハー ウント シーオー カーゲー エネルギー吸収装置

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US12103445B2 (en) 2024-10-01
JP7417158B2 (ja) 2024-01-18
CN115135900B (zh) 2024-04-02
US20230158928A1 (en) 2023-05-25
JPWO2021201291A1 (https=) 2021-10-07
CN115135900A (zh) 2022-09-30

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