JP5576054B2 - Load absorption structure - Google Patents

Description

  The present invention relates to a load absorbing structure in which a load absorbing member is provided in a structure.

  As a load absorbing structure, there is a structure in which an air bag is constituted by a pair of metal sheets, and an air bag (a cross section of the air bag) is inflated by gas from an inflator at the time of a collision of an automobile (for example, see Patent Document 1). .

  In this load absorbing structure, when a load is input to the inflated airbag, the airbag is crushed and deformed, so that the load input to the airbag is absorbed.

  However, in this load absorbing structure, the input direction of the load to the inflated airbag is not unique. For this reason, it is necessary to inflate the airbag in a plurality of directions corresponding to the input direction of the load, and there is a possibility that the cross section of the airbag before being inflated becomes large.

JP-T-2004-500294 gazette

  In view of the above facts, an object of the present invention is to obtain a load absorbing structure that can reduce the cross section of the load absorbing member before being expanded and can efficiently absorb the load input to the load absorbing member.

  The load absorbing structure according to claim 1 is provided at a load input side end portion of the structure and a structure to which a load is input from the load input side which is one side in the axial direction, and is expandable to the load input side. And an expansion means for expanding the load absorption member to the load input side when a load is input to the load absorption member from the load input side.

  The load absorbing structure according to claim 2 is the load absorbing structure according to claim 1, wherein the load absorbing member is provided on a load input side, and is formed into a flat plate portion and a flat plate portion. A thin plate portion that is thinned and folded.

  In the load absorbing structure according to the first aspect, a load is input to the structure from the load input side that is one side in the axial direction. Furthermore, the load absorption member is provided in the load input side edge part of the structure, and the load absorption member can be expanded to the load input side.

  Here, when a load is input to the load absorbing member from the load input side, the expansion means expands the load absorbing member to the load input side. Furthermore, when a load is input to the load absorbing member from the load input side, the load absorbing member is crushed and deformed to the opposite side of the load input side by the input load, and the load input to the load absorbing member is absorbed. Is done.

  Thus, after the load absorbing member is once expanded to the load input side, it is crushed and deformed to the side opposite to the load input side. For this reason, while being able to make the cross section of the load absorption member before expansion | swelling small, the stroke amount by which a load absorption member is crushed and deformed can be earned, and the load input into a load absorption member can be absorbed efficiently.

  In the load absorbing structure according to claim 2, in the load absorbing member, the flat plate portion provided on the load input side is formed into a flat plate shape, and the thin plate portion which is thinner than the flat plate portion is folded.

  For this reason, when a load is input to the load absorbing member from the load input side, the thin plate portion is extended to the load input side while the flat plate portion is restrained from being deformed (folding is eliminated), and the load absorbing member is It is expanded to the load input side. In addition, when a load is input to the load absorbing member from the load input side, the flat plate portion is suppressed from being deformed while the thin plate portion is crushed and deformed to the opposite side of the load input side, so that the load absorbing member receives the load input. It is crushed and deformed to the opposite side.

  Thereby, the deformation mode of the load absorbing member and the load absorbed by the load absorbing member can be appropriately controlled by the thickness and shape of the thin plate portion, and the deformation mode of the load absorbing member and the control of the load absorbed by the load absorbing member are stabilized. It can be made.

It is sectional drawing (1-1 line sectional drawing of FIG. 3) seen from the side which shows the load absorption structure which concerns on the 1st Embodiment of this invention. (A) And (B) is sectional drawing seen from the side which shows the time of the collision load input to the load absorption structure which concerns on the 1st Embodiment of this invention (1-1 line position sectional drawing of FIG. 3). (A) shows the moment of collision load input to the load absorbing structure, and (B) shows after the collision load input to the load absorbing structure. It is the perspective view seen from the upper diagonal side which shows the load absorption structure which concerns on the 1st Embodiment of this invention. It is sectional drawing (1-1 line position sectional drawing of FIG. 3) seen from the side which shows the load absorption structure which concerns on the 2nd Embodiment of this invention. It is sectional drawing (1-1 line position sectional drawing of FIG. 3) seen from the side which shows the load absorption structure which concerns on the 3rd Embodiment of this invention.

[First Embodiment]
FIG. 1 is a cross-sectional view (cross-sectional view taken along line 1-1 in FIG. 3) of the load absorbing structure 10 (shock absorbing structure) according to the first embodiment of the present invention viewed from the side. FIG. 3 is a perspective view of the load absorbing structure 10 as viewed from the upper side. In the drawing, one side in the axial direction of the load absorbing structure 10 is indicated by an arrow A, and the other side in the axial direction of the load absorbing structure 10 is indicated by an arrow B.

  The load absorbing structure 10 according to the present embodiment is, for example, a side member that constitutes a vehicle body frame of a vehicle (automobile), and the side members are arranged at the right and left sides of the front and rear portions of the vehicle. Stretched in the front-rear direction. Bumpers constituting a vehicle body frame are respectively provided at the vehicle front side ends of the pair of side members at the right side and left side of the front part of the vehicle and at the vehicle rear side ends of the pair of side members at the rear side and left side of the vehicle. The pair of bumpers are extended in the vehicle width direction at the front end and the rear end of the vehicle, respectively.

  As shown in FIGS. 1 and 3, the load absorbing structure 10 is provided with a metal (sheet metal) structure 12, and the structure 12 may be cylindrical (a hollow, polygonal (rectangular, etc.). ) May be cylindrical). An end plate 12A as a fixing portion is integrally provided at one end in the axial direction (longitudinal direction) of the structure body 12, and the end plate 12A is formed into an annular plate so as to be on one side in the axial direction of the structure body 12. The edge is partially closed. One side of the structural body 12 in the axial direction is directed to the outside of the vehicle, for example, and a collision load (impact) is input to the structural body 12 from one side in the axial direction at the time of a vehicle collision.

  A metal (iron, steel) load absorbing member 14 is provided on one side of the structure 12 in the axial direction. The load absorbing member 14 has a cylindrical shape (the structure 12 has a polygonal cylindrical shape). In this case, a thin plate portion 16 of the polygonal cylinder shape is provided. The other end in the axial direction of the thin plate portion 16 is coupled in a state of being fitted to one end in the axial direction of the structure 12, whereby the load absorbing member 14 is coupled to the structure 12.

  The thin plate portion 16 is formed by folding a predetermined number of bent portions 16A with a U-shaped cross section on one side in the axial direction from the structure 12, and each of the predetermined number of bent portions 16A It protrudes inward in the radial direction of the circumference, and is arranged along the axial direction of the thin plate portion 16 on the radially inner side of the thin plate portion 16.

  At one end in the axial direction of the load absorbing member 14, a thick flat plate portion 18 is provided as a flat plate portion (in the case where the structure 12 is a polygonal cylindrical shape, the polygonal plate shape). The thick plate portion 18 is thicker and more rigid than the thin plate portion 16. The load absorbing member 14 is formed of a so-called TB (tailored blank), and the peripheral portion of the thick plate portion 18 is coupled (welded) to one axial end of the thin plate portion 16. When the vehicle collides, the collision load is directly input to the thick plate portion 18 of the load absorbing member 14 from one side in the axial direction.

  A columnar inflator 20 as an expansion means is provided in the end plate 12A of the structure 12, and a coupling frame 20A formed as an annular plate as a coupling portion is fixed to the outer periphery in the middle in the longitudinal direction of the inflator 20. Has been. The coupling frame 20 </ b> A is coupled to the end plate 12 </ b> A of the structure 12, whereby the inflator 20 is fixed to the structure 12. At the time of collision of the vehicle, the moment when the collision load is input to the load absorbing member 14 (thick plate portion 18) from one axial direction (the moment when the input of the collision load from one axial direction to the load absorbing member 14 is detected) ), The inflator 20 is activated, and the inflator 20 instantaneously injects high-pressure gas toward only one side in the axial direction. Note that the inflator 20 may be configured to be operated at the moment when a vehicle collision is detected (immediately before the collision load is input to the load absorbing member 14 (thick plate portion 18) from one side in the axial direction).

  Next, the operation of the present embodiment will be described.

  In the load absorbing structure 10 having the above configuration, as shown in FIG. 2A, at the moment when a collision load is input to the load absorbing member 14 (thick plate portion 18) from one side in the axial direction at the time of a vehicle collision, The inflator 20 is activated, and the inflator 20 instantaneously injects high-pressure gas toward only one side in the axial direction. For this reason, the thick plate portion 18 is pressed to one side in the axial direction while being prevented from being deformed by the gas injection pressure (impact), and the thin plate portion 16 is extended and deformed to one side in the axial direction (folding is eliminated). ), The load absorbing member 14 is instantaneously expanded to one side in the axial direction.

  Further, as shown in FIG. 2B, when a collision load is input to the load absorbing member 14 (thick plate portion 18) from one side in the axial direction, the thick plate portion 18 is prevented from being deformed by the collision load. When pressed to the other side in the axial direction, the thin plate portion 16 is crushed and deformed to the other side in the axial direction. Thereby, the load absorbing member 14 is crushed and deformed to the other side in the axial direction, and the collision load input to the load absorbing member 14 is absorbed.

  Thus, after the load absorbing member 14 is once expanded to the load input side (one side in the axial direction), it is crushed and deformed to the side opposite to the load input side (the other side in the axial direction). For this reason, the cross section of the load absorbing member 14 before being expanded can be reduced, the stroke amount by which the load absorbing member 14 is crushed and deformed can be earned, and the collision load input to the load absorbing member 14 can be efficiently absorbed. it can. Thereby, the weight reduction and cost reduction of the load absorption member 14 are realizable.

  Further, as described above, when the load absorbing member 14 is expanded and when the load absorbing member 14 is crushed and deformed, the thick plate portion 18 is prevented from being deformed, while the thin plate portion 16 is deformed. For this reason, the deformation mode of the load absorbing member 14 and the load absorbed (generated) by the load absorbing member 14 can be appropriately controlled by the thickness and shape of the thin plate portion 16, and the deformation mode of the load absorbing member 14 and the load absorbing member 14 can be controlled. It is possible to stabilize the control of the load absorbed by. Thereby, the weight reduction and cost reduction of the load absorption member 14 are further realizable by designing the load absorption member 14 efficiently.

[Second Embodiment]
FIG. 4 is a cross-sectional view (cross-sectional view taken along line 1-1 in FIG. 3) of the load absorbing structure 30 (impact absorbing structure) according to the second embodiment of the present invention viewed from the side. Yes.

  The load absorbing structure 30 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  In the load absorbing structure 30 according to the present embodiment, in the thin plate portion 16 of the load absorbing member 14, a predetermined number of bent portions 16A are arranged on the radially outer side of the thin plate portion 16, and the predetermined number of bent portions. 16A protrudes to the other axial side of the entire circumference of the thin plate portion 16 and is arranged along the radial direction of the thin plate portion 16. The predetermined number of bent portions 16 </ b> A are connected to the structure 12 at the radially inner end of the thin plate portion 16 and are connected to the peripheral portion of the thick plate portion 18 at the radially outer end of the thin plate portion 16. .

  Here, also in this embodiment, the same operations and effects as those in the first embodiment can be obtained.

[Third Embodiment]
FIG. 5 shows a load absorption structure 50 (shock absorption structure) according to a third embodiment of the present invention in a sectional view (sectional view taken along the line 1-1 in FIG. 3) viewed from the side. Yes.

  The load absorbing structure 50 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  In the load absorbing structure 50 according to the present embodiment, in the thin plate portion 16 of the load absorbing member 14, a predetermined number of bent portions 16 </ b> A are respectively projected outward in the radial direction of the entire circumference of the thin plate portion 16. They are arranged along the axial direction of the thin plate portion 16 on the radially outer side.

  Here, also in this embodiment, the same operations and effects as those in the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Load absorption structure 12 Structure 14 Load absorption member 16 Thin plate part 18 Thick plate part (flat plate part)
20 Inflator (Expansion means)
30 Load absorption structure 50 Load absorption structure

Claims (1)

A structure in which a load is input from the load input side which is one side in the axial direction;
A load absorbing member provided at the load input side end of the structure, and capable of expanding to the load input side;
Expansion means for expanding the load absorbing member to the load input side when a load is input to the load absorbing member from the load input side;
With
The load absorbing member is
A flat plate portion that is provided on the load input side, is formed into a flat plate shape, and is pressed to the other side in the axial direction by the load while being prevented from being deformed;
Compared to the flat plate portion, it is thinned, has a bent portion that is formed by being folded and disposed radially outward from the structure , and after being extended to the load input side by the expansion means, A thin plate portion that is crushed and deformed to the other side in the axial direction;
Having a load absorbing structure.

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