JP2019151135A - Impact absorption mechanism - Google Patents

Abstract

To provide an impact absorption mechanism that can preferably absorb an impact.SOLUTION: An impact absorption mechanism 2 configured to reduce an impact load applied to a vehicle is provided between a bumper reinforcement 11 that receives an impact load and a side member 9 to which the impact load is transmitted from the bumper reinforcement 11. The impact absorption mechanism 2 includes a wooden columnar impact absorption member 1, a cover member 7 that covers the impact absorption member 1, and a bolt 3. The bolt 3 is connected to the side member 9 and has a flat surface portion 5 and a protruded surface portion 6 that face the bumper reinforcement 11. The bolt extends through a portion of a rear end portion of the impact absorption member 1. At the time of a collision of the vehicle, the flat surface portion 5 of the bolt 3 presses the impact absorption member 1 and the protruded surface portion 6 presses the cover member 7 on the side in an axial direction of the impact absorption member 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an impact absorbing mechanism that absorbs an impact applied to a vehicle.

  Patent Documents 1 and 2 describe technologies related to an impact absorbing mechanism configured to receive a collision load at the time of a vehicle collision and absorb the impact.

  In Patent Documents 1 and 2, when the bumper reinforcement is pushed to the side member at the time of a vehicle front collision, the wood provided between the bumper reinforcement and the side member is pushed by a connecting material such as a bolt to compress or An impact absorbing mechanism is described in which impact is absorbed by shearing.

International Publication No. 2014/077314 JP 2017-7598

  However, in these shock absorbing mechanisms, since the connecting material such as the bolt has a circular cross section, when the bumper reinforcement is pushed to the side member side at the time of the collision, the connecting material such as the bolt pushes the wood and tears the wood. Behavior may occur and the wood may not be compressed or sheared as expected and the intended shock absorption may not be achieved.

  In some cases, the side surface of the wood is covered with a covering material. In this case, it is desirable to avoid compression by the connecting material. That is, if the covering material is compressed and crushed at the time of a collision, the crushed covering material enters between the connecting material and the wood and becomes solid, and there is a risk that the assumed wood is not compressed or sheared.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an impact absorbing mechanism capable of suitably absorbing an impact.

  The present invention for achieving the above-described object is an impact absorbing mechanism for reducing a collision load applied to a vehicle, and includes a load receiving member that receives a collision load and a target that receives the collision load from the load receiving member. A wooden columnar shock absorber provided between the transmission members and having one end in the axial direction of the member inserted into an internal space of one of the load receiving member and the transmitted member; and at least the impact A covering material that covers a side surface of the absorbent member in the member axial direction, and a first connecting member connected to the one member, wherein the first connecting member includes the load receiving member and the transmitted member. A planar portion or a concave portion facing the other member, and a convex portion or a narrow portion facing the other member, wherein the narrow portion is the planar portion of the first connecting member. Or a portion narrower than the concave surface, The shock absorbing material, wherein the flat surface portion or concave surface portion of one connecting member presses the shock absorbing material, and the convex surface portion or narrow width portion of the first connecting material presses the covering material on the side surface. Mechanism.

  In the present invention, the first connecting material that contributes to shock absorption is not a circular cross section, but has the above-described flat surface portion or concave surface portion and convex surface portion or narrow width portion. This prevents the wooden shock absorbers from being pushed apart at the time of collision by the flat part of the connecting material, etc., while the convex surface part of the connecting material pushes the covering material and splits so that the covering material does not compress and collapse. The intended shock absorption can be realized.

The first connecting member penetrates, for example, the one end of the shock absorber. Or you may contact | connect the end surface of the said one edge part of the said shock-absorbing material.
In the former case, the shock absorbing material can be suitably held by the connecting material, and in the latter case, it is not necessary to make a hole in the shock absorbing material, and the structure is simple.

The first connecting member may be, for example, a rod member, and the flat portion or the concave portion and the convex portion or the narrow portion may be formed on a component attached to the rod member. Alternatively, the first connecting material may be a plate material.
As the connecting material, a rod such as a bolt can be used, and this can be suitably fixed to the load receiving member or the transmitted member. The flat portion and the convex surface portion may be formed by processing a bar material, but may be formed in a separate part attached to the bar material. By attaching a separate part, it is possible to easily add a flat part or a convex part to an existing product. On the other hand, a plate material can be used as the connecting material, and there is an advantage that the load can be received in a wider area.

The other end of the shock absorber in the axial direction of the member further includes a second connecting member inserted into the internal space of the other member and connected to the other member, and the second connecting member Has a flat surface portion or concave surface portion facing the one member, and a convex surface portion or narrow width portion facing the one member, and the narrow width portion is the flat surface of the second connecting member. A portion that is narrower than the portion or the concave surface portion, and the flat surface portion or the concave surface portion of the second connecting material presses the impact absorbing material at the time of collision, and the convex surface portion or the narrow width of the second connecting material. It is also desirable that the portion pushes the covering material on the side surface, and the first connecting material and the second connecting material are arranged at different positions when viewed from the member axial direction of the shock absorbing material.
In this case, shock absorption by shearing of the shock absorbing material is possible. In this case as well, the above-described second connecting material that contributes to shock absorption has the above-described flat surface portion and convex surface portion, so While the impact absorbing material is prevented from being pushed apart by the flat part of the connecting material, the convex part of the connecting material pushes and tears the covering material so that the covering material is not compressed and crushed. It will be easier to induce shearing.

  According to the present invention, it is possible to provide an impact absorbing mechanism capable of suitably absorbing an impact.

Schematic which shows arrangement | positioning of the shock absorption mechanism 2. FIG. The figure which shows the shock absorption mechanism 2. FIG. The figure which shows the shock absorption mechanism 2. FIG. The figure which shows the volt | bolt 3. FIG. The figure which shows the impact-absorbing mechanism 2 of the state to which the collision load was added. The figure shown about compression of the coating | covering material 7. FIG. The figure which shows the relationship between the displacement of the bumper reinforcement 11, and the load which the volt | bolt 3 receives. The example of the cross-sectional shape of the plane part 5. FIG. An example of the cross-sectional shape of the concave surface portion 8. The example of the cross-sectional shape of the convex part 6 is shown. The figure which shows the volt | bolt 3a. The figure which shows the volt | bolt 3b and the color | collar 25. FIG. The figure which shows the impact-absorbing mechanism 2a. The figure which shows the impact-absorbing mechanism 2a in the state where the collision load was added. The figure which shows the impact-absorbing mechanism 2a '. The figure which shows the impact-absorbing mechanism 2b. The figure which shows the impact-absorbing mechanism 2b. The figure which shows the impact-absorbing mechanism 2b in the state where the collision load was added. The figure which shows volt | bolt 3a '. The figure which shows the impact-absorbing mechanism 2c. The figure which shows the impact-absorbing mechanism 2c in the state to which the collision load was added.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic view showing the arrangement of an impact absorbing mechanism 2 according to an embodiment of the present invention. The shock absorbing mechanism 2 is provided in the vehicle 10 for absorbing a shock applied to the vehicle 10 at the time of a collision and reducing a collision load. The shock absorbing mechanism 2 is disposed between a bumper reinforcement 11 of a front bumper (not shown) and a side member 9 of the vehicle 10.

  The left and right in FIG. 1 correspond to the vehicle front-rear direction, and the upper and lower in FIG. 1 correspond to the vehicle width direction. Hereinafter, the term “front” refers to the front side of the vehicle 10 and corresponds to the left side of FIG. “Rear” refers to the rear side of the vehicle 10 and corresponds to the right side of FIG.

  The bumper reinforcement 11 is a load receiving member that receives a load at the time of a vehicle front collision, and is arranged to extend in the vehicle width direction at the front portion of the vehicle 10.

  The side member 9 is a transmitted member to which a collision load received by the bumper reinforcement 11 is transmitted. The side members 9 are arranged on the left and right in the vehicle width direction, and the shock absorbing mechanism 2 is provided between each side member 9 and the bumper reinforcement 11.

  2 and 3 are views showing the shock absorbing mechanism 2. FIG. 2 is a view showing a cross section in the vertical direction along the member axial direction of the shock absorber 1. 3 (a) and 3 (b) are diagrams showing horizontal cross sections taken along lines aa and bb in FIG. 2, respectively, and FIG. 3 (c) is a line cc in FIG. 3 (a). It is a figure which shows the cross section of the perpendicular direction along line. FIG. 2 is a cross section taken along the line dd in FIG.

  As shown in FIGS. 2 and 3, the shock absorbing mechanism 2 includes a shock absorbing material 1, a bolt 3, a covering material 7 and the like.

  The shock absorber 1 is a wooden columnar member (wood), and both end portions in the member axial direction with the member axial direction as the vehicle front-rear direction (corresponding to the left-right direction in FIGS. 2, 3A, and 3B). Are arranged so as to be on the bumper reinforcement 11 side and the side member 9 side, respectively. In the present embodiment, the member axial direction corresponds to the axial center direction of wood annual rings (wood fiber direction).

  The shock absorber 1 is covered with a covering material 7. The covering material 7 is made of, for example, resin, and covers the side surface in the member axial direction and both end surfaces in the member axial direction of the shock absorber 1. That is, the covering material 7 covers the entire surface of the shock absorbing material 1.

  The front end portion of the shock absorbing material 1 covered with the covering material 7 abuts on the bumper reinforcement 11 and is fixed to the bumper reinforcement 11 by the bracket 13.

  The front end portion of the side member 9 has a cylindrical shape, and the rear end portion (one end portion) of the shock absorber 1 covered with the covering material 7 is the inside of the cylindrical portion of the side member 9 (one member). Inserted into the space.

  The bolt 3 is a metal headed bolt and is disposed so as to contact a part of a surface (surface shown in FIG. 3C) orthogonal to the member axial direction of the shock absorber 1. The bolt 3 is a bar (connecting material) connected to the front end of the side member 9. Two bolts 3 are arranged in the vehicle width direction (corresponding to the vertical direction in FIGS. 3A and 3B), but the number and arrangement thereof are not particularly limited.

  Here, when viewed from the member axial direction of the shock absorber 1 (see the arrow in FIG. 3A), the side between the bolt 3 and the bumper reinforcement 11 (the other member) overlaps with the bolt 3. There is no other bolt 3 connected to the member 9, and this bolt 3 greatly contributes to shock absorption.

  The shaft portion of the bolt 3 penetrates the side member 9, the covering material 7 and the shock absorbing material 1 from the lower surface of the side member 9, and the tip of the shaft portion is fixed to the upper surface of the side member 9 by the nut 4. Thereby, the bolt 3 is fixed to the front end portion of the side member 9, and the shock absorber 1 is held by the bolt 3.

  A flat surface portion 5 facing the bumper reinforcement 11 side is formed at the longitudinal center portion of the shaft portion of the bolt 3. The flat portion 5 is formed in a range penetrating the shock absorber 1 in FIG. The flat surface portion 5 is formed integrally with the shaft portion by processing the shaft portion of the bolt 3, and a cross section perpendicular to the longitudinal direction of the shaft portion of the bolt 3 (hereinafter simply referred to as a cross section) cuts a part of a circle with a straight line. Shape.

  On the other hand, convex portions 6 facing the bumper reinforcement 11 are formed at both ends in the longitudinal direction of the shaft portion of the bolt 3. The convex surface portion 6 is formed in a range penetrating at least the covering material 7 and the side member 9 in FIG. In the present embodiment, the convex surface portion 6 is further slightly extended to a partial range of the shock absorber 1. In the convex surface portion 6, the cross section of the shaft portion of the bolt 3 is circular, and an arc-shaped convex surface portion 6 is formed on the bumper reinforcement 11 side.

  For example, as shown in FIG. 4A, the bolt 3 is manufactured by separately forming a shaft portion of the bolt 3 at a central portion 31 having a flat portion 5 and both end portions 32 having a convex portion 6. One end 32 is provided with the head of the bolt 3.

  Then, as shown in FIG. 4 (b), the central portion 31 is passed through the through hole of the shock absorber 1 having a planar shape corresponding to the cross section of the flat portion 5, and the central portion 31 is shown in FIG. 4 (c). What is necessary is just to attach the both ends 32 to. A circular flat hole corresponding to the cross section of the convex portion 6 is formed in the covering material 7, the side member 9, and a part of the shock absorbing material 1. In this way, the bolt 3 can be disposed through the shock absorber 1 and the like, and then the nut 4 is tightened.

  FIG. 5 is a view showing the shock absorbing mechanism 2 in a state where a collision load is applied in the direction indicated by the arrow A. FIG. FIGS. 5A to 5C correspond to the cross sections shown in FIGS. 2, 3A, and 3B, respectively.

  As shown in FIG. 5B, when a collision load is applied in the direction indicated by the arrow A and the bumper reinforcement 11 is pushed to the side member 9 side, in the initial stage, the bolt 3 in the vehicle width direction of the shock absorber 1 is used. A portion at a position corresponding to is pressed forward by the flat portion 5 and compressed. As a result, local compression occurs in the shock absorber 1, the wood is cured, and the compression portion 19 is formed. Thereafter, the shock absorbing material 1 enters the side member 9 while being shear-deformed by the flat portion 5 of the bolt 3.

  The covering material 7 prevents the impact absorbing material 1 from bulging to the side and prevents the collision load received by the bolt 3 from falling. However, the covering material 7 on the side surface of the impact absorbing material 1 corresponds to the bolt 3 in the vehicle width direction. As shown in FIG. 5 (c), the portion at the position to be pushed is split by being pushed apart by the convex surface portion 6, and the split covering material 7 enters the inside of the side member 9.

  In the above-described process, the flat portion 5 of the bolt 3 can compress the impact absorbing material 1 suitably and stably accept a larger load without pushing the impact absorbing material 1 as described above. On the other hand, the convex portion 6 of the bolt 3 pushes the covering material 7 on the side surface of the shock absorber 1 to prevent the bolt 3 from compressing the covering material 7, and the covering material 7 is crushed and solidified. Will not be disturbed.

  That is, if the convex surface portion 6 is the flat surface portion 5, the covering material 7 on the side surface of the shock absorber 1 is compressed and crushed by the flat surface portion 5 as shown in FIG. Although this may interfere with the compression of the shock absorbing material 1 by entering between the materials 1 and as a result, the compression range of the wood may be reduced from the initial assumption, and a sufficient shock absorbing effect may not be obtained. Then there is no such fear.

  FIG. 7 shows the relationship between the displacement of the bumper reinforcement 11 and the load received by the bolt 3 (the load absorbed by the compression of the shock absorber 1) in the above collision process, with the vertical axis representing the load and the horizontal axis representing the side of the bumper reinforcement 11. It is the figure shown as a displacement to the member 9 side.

  In the shock absorbing mechanism 2 of this embodiment, the bolt 3 has the flat surface portion 5 and the convex surface portion 6, so that the wood used for the shock absorbing material 1 can be prevented from tearing, and the covering material 7 is compressed at the time of collision. It does not disturb the compression of the shock absorber 1. Therefore, in the conventional example using a bolt with a circular cross section, as shown by the dotted line 21, the displacement proceeds at a low load due to the tearing of the wood. In this embodiment, as shown by the solid line 23 during the movement of the bumper reinforcement 11, as shown in FIG. A large load can be received stably. The shock absorption amount of the shock absorber 1 is represented by an integral value due to the displacement of the load indicated by a solid line 23, and is significantly increased as compared with the conventional example.

  As described above, according to the first embodiment, the bolt 3 does not have a uniform circular cross section, but has the flat surface portion 5 and the convex surface portion 6, and the impact absorbing material 1 is pushed apart at the time of collision. Is prevented by the flat surface portion 5 of the bolt 3, while the convex surface portion 6 of the bolt 3 splits the covering material 7 so that the covering material 7 is not compressed and crushed, so that the intended shock absorption can be realized. Become. That is, the compression part 19 can be reliably formed at the initial stage of the collision, and a larger load can be received. Thereafter, the impact absorbing material 1 is stably broken while being sheared by the bolt 3, and the destruction proceeds stably, and a larger impact can be absorbed by taking advantage of the wood that fluctuation of the collision load is small.

  However, the present invention is not limited to this. For example, in this embodiment, the axial center direction of the annual ring of the shock absorber 1 corresponds to the member axial direction, but may be a direction different from the member axial direction.

  In the present embodiment, a metal bolt is used as the connecting member, but the connecting member is not limited to the bolt but may be a pin or the like as long as it is connected to the side member 9. The material is not limited to metal, but may be ceramic.

  Further, the cross-sectional shape of the connecting material is not limited to that described in the first embodiment. FIG. 8 is a diagram showing an example of a cross section of the flat portion 5. For example, FIG. 8A shows a shape in which a semicircle and a rectangle are combined, and the flat portion 5 is provided in the rectangular portion. Further, FIG. 8B is a quadrangular shape, and FIG. 8C is a hexagonal shape, each having a polygonal cross section, and having the flat portion 5 as described above.

  Further, even if a concave surface portion is provided in place of the flat surface portion 5, the same effect as described above can be obtained. For example, as shown in FIG. The concave surface portion 8 may be provided as a cross-sectional shape obtained by cutting off a part of a rectangle with an arc as shown in FIG. Further, the concave surface portion is not limited to an arcuate curved surface, and for example, as shown in FIG. 9C, a cross-sectional shape obtained by cutting a part of a rectangle into a wedge shape may be provided, and a concave surface portion 8 formed in a wedge shape by a straight line may be provided. .

  Furthermore, the cross-sectional shape of the convex portion 6 is not particularly limited. For example, FIG. 10A has a quadrangular shape and FIG. 10B has a hexagonal shape, each having a polygonal cross section. At this time, the convex surface portion 6 protruding in a triangular shape is formed on the bumper reinforcement 11 side.

  Further, the cross-sectional shape may be continuously changed between the flat surface portion 5 and the convex surface portion 6. Also in this case, the convex surface part 6 shall be formed in the range which has penetrated at least the coating | covering material 7 and the side member 9 of the both ends of the longitudinal direction of the axial part of the volt | bolt 3. FIG.

  Moreover, as shown to Fig.11 (a), you may use the volt | bolt 3a which has the axial part which integrated the plane part 5 and the convex surface part 6. FIG. In this case, as shown in FIG. 11B, the shape of the through hole of the shock absorber 1 is matched with the cross section of the convex surface portion 6 of the bolt 3 so that a gap 12 is formed between the flat portion 5 and the shock absorber 1. Keep it. In this example, it is not necessary to divide the shaft portion of the bolt 3 as described above, and it is only necessary to pass the single bolt 3a having the flat surface portion 5 and the convex surface portion 6 through the through-hole of the shock absorber 1 or the like. Mounting of 3a becomes easy.

  Further, as shown in FIG. 12A, a collar 25 having a flat surface portion 5 and a convex surface portion 6 may be attached as separate parts around the shaft portion of the bolt 3b. Thereby, the plane part 5 and the convex part 6 can be easily added to the ready-made bolt 3b. 12B and 12C are cross sections taken along lines ee and ff in FIG. 12A, respectively, and the cross section perpendicular to the longitudinal direction of the collar 25 is a circle at the center in the longitudinal direction. A shape obtained by cutting out a part with a straight line and circular at both ends, the flat surface portion 5 and the convex surface portion 6 are formed as in the first embodiment.

  Hereinafter, other examples of the present invention will be described as second to fourth embodiments. Each embodiment will be described with respect to differences from the embodiments described so far, and the same components will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. In addition, the configurations described in each embodiment including the first embodiment can be combined as necessary.

[Second Embodiment]
FIG. 13 is a diagram showing an impact absorbing mechanism 2a of the second embodiment. FIG. 13A is a view showing a vertical cross section along the member axial direction of the shock absorber 1, and FIGS. 13B and 13C are the lines ff and f in FIG. 13A, respectively. It is a figure which shows the cross section of the horizontal direction by gg. FIG. 13A is a cross section taken along line hh in FIG.

  In the shock absorbing mechanism 2a, the bolt 3a (see FIG. 11) is provided behind the rear end surface of the shock absorbing material 1, and the convex portion 6 of the bolt 3a is disposed on the rear end surface of the shock absorbing material 1 with a covering material 7 interposed therebetween. Differing from those of the first embodiment in that they contact each other.

  FIG. 14 is a diagram showing the shock absorbing mechanism 2a in a state where a collision load is applied in the direction indicated by the arrow A. 14A and 14B correspond to the cross sections shown in FIGS. 13B and 13C, respectively.

  When the bumper reinforcement 11 is pushed to the side member 9 side due to the collision load, local compression is generated in the shock absorber 1 by the flat portion 5 of the bolt 3a in the initial stage, and the wood is hardened. Thus, the compression portion 19 is formed, and then the shock absorber 1 enters the side member 9 while being sheared and deformed by the flat portion 5 of the bolt 3a. Further, the covering material 7 on the side surface of the shock absorbing material 1 is pushed and split by the convex portion 6 of the bolt 3 a, and the torn covering material 7 enters the inside of the side member 9.

  Therefore, also in the second embodiment, the flat portion 5 and the convex surface portion 6 of the bolt 3a function in the same manner as the flat surface portion 5 and the convex surface portion 6 of the bolt 3, and it is possible to realize intended shock absorption. Thus, the same effect as in the first embodiment can be obtained.

  Furthermore, in 2nd Embodiment, since the volt | bolt 3a is not penetrated to the impact-absorbing material 1, it is not necessary to make a hole in the impact-absorbing material 1 etc., and becomes a simple structure. Moreover, the compression part 19 can be taken long and more loads can be absorbed. On the other hand, when the bolt 3 penetrates the shock absorber 1 as in the first embodiment, the shock absorber 1 can be suitably held.

  In the second embodiment, the entire surface of the shock absorbing material 1 is covered with the covering material 7, but instead of this, a cylindrical casing 7a (covering material) like the shock absorbing mechanism 2a 'of FIG. 15 is used. Only the side surface of the shock absorber 1 in the member axial direction may be covered. The casing 7a only needs to be made of a material that can be pushed and split by the convex surface portion 6 at the time of the collision, and for example, a metal such as aluminum is used. The same casing 7a can also be used in the first embodiment described above.

[Third Embodiment]
16 and 17 are views showing an impact absorbing mechanism 2b according to the third embodiment. FIG. 16 is a view showing a vertical section along the member axial direction of the shock absorber 1. 17 (a) and 17 (b) are diagrams showing horizontal cross sections taken along lines ii and jj in FIG. 16, respectively, and FIG. 17 (c) is a line kk in FIG. 17 (a). It is a figure which shows the cross section of the perpendicular direction along line. FIG. 16 is a cross-sectional view taken along line mm in FIG.

  The shock absorbing mechanism 2b is different from the second embodiment in that a plate material 3c is used as a connecting material instead of the bolt 3a.

  The plate member 3 c is connected to the front end portion of the side member 9 and has a flat surface portion 5 a on the bumper reinforcement 11 side, and the flat surface portion 5 a is in contact with the rear end surface of the shock absorber 1 through the covering material 7. Further, the flat surface portion 5 a of the plate member 3 c has narrow width portions 29 at both end portions in the vicinity of the inner surface of the side member 9. The narrow width portion 29 is a portion narrower than the flat surface portion 5a, and is formed by providing an opening 27 in the flat surface portion 5a in this embodiment.

  FIG. 18 is a diagram showing the shock absorbing mechanism 2b in a state where a collision load is applied in the direction indicated by the arrow A. FIGS. 18A and 18B correspond to the cross sections shown in FIGS. 17A and 17B, respectively.

  When the bumper reinforcement 11 is pushed to the side member 9 side due to a collision load, local compression is generated in the shock absorbing material 1 by the flat surface portion 5a of the plate material 3c in the initial stage, and the wood is cured. Thus, the compression part 19 is formed, and then the shock absorber 1 enters the inside of the side member 9 while being subjected to shear deformation by the flat part 5a of the plate 3c. Further, the covering material 7 on the side surface of the shock absorber 1 is pushed and split by the narrow portion 29, and the torn covering material 7 is an opening 27 (see FIG. 17B) between the narrow portions 29 or It enters the inside of the side member 9 through both sides of the flat portion 5a.

  As described above, in the third embodiment, the flat portion 5a and the narrow portion 29 of the plate 3c function in the same manner as the flat portion 5 and the convex portion 6 of the bolt 3 described above in the event of a collision. The same effect can be obtained. Further, by using the plate material 3c, the load can be received on a wide surface. Also in the first and second embodiments, as shown by the bolt 3a ′ in FIG. 19, an opening 27 is provided in place of the convex surface portion 6 of the bolt 3a described above, and the width is narrower than that of the flat surface portion 5. What formed the part 29 may be used.

[Fourth Embodiment]
FIG. 20 is a diagram illustrating an impact absorbing mechanism 2c according to the fourth embodiment. FIG. 20A is a diagram showing a horizontal cross section of the shock absorbing mechanism 2 c and is a cross section at a height corresponding to the flat portion 5 of the bolt 3. FIGS. 20B and 20C are views showing vertical sections taken along lines nn and pp in FIG. 20A, respectively.

  The shock absorbing mechanism 2c is different from the first embodiment in that the shock absorbing mechanism 1c performs shock absorption by shearing of the shock absorbing material 1.

  That is, in the shock absorbing mechanism 2c, the front end portion (the other end portion) of the shock absorbing material 1 covered with the covering material 7 is connected to the bumper reinforcement 11a (the other side) from the opening 110 provided on the rear wall of the cylindrical bumper reinforcement 11a. In the internal space of the member.

  The shock absorbing mechanism 2c has a bolt 3 (connecting material) connected to the bumper reinforcement 11a, and a shaft portion of the bolt 3 penetrates the bumper reinforcement 11a, the covering material 7 and the shock absorbing material 1 from the lower surface of the bumper reinforcement 11a. The tip of the shaft is fixed to the upper surface of the bumper reinforcement 11a by the nut 4. The bolt 3 is arranged so that the convex surface portion 6 and the flat surface portion 5 are positioned on the side member 9 side, and a gap is provided between the covering material 7 on the front end surface of the shock absorber 1 and the front wall of the bumper reinforcement 11a. .

  The rear end portion of the shock absorber 1 is inserted into the front end portion of the side member 9 as described above, and the shaft portion of the bolt 3 penetrates the side member 9, the covering material 7 and the shock absorber 1 from the lower surface of the side member 9, The tip of the shaft portion is fixed to the upper surface of the side member 9 by the nut 4.

  Here, when viewed from the axial direction of the member (see the arrow in FIG. 20A), the bolt 3 at the front end and the bolt 3 at the rear end of the shock absorber 1 are arranged at different positions, and these plane portions The five are not facing each other. Further, when viewed from the member axial direction, between the bolt 3 at the front end portion of the shock absorber 1 and the side member 9, there is another bolt 3 or the like connected to the bumper reinforcement 11a at a position overlapping with the bolt 3 at the front end portion. not exist.

  An opening 111 is formed in the front wall of the bumper reinforcement 11a at a position corresponding to the bolt 3 at the rear end of the shock absorber 1 and the vehicle width direction.

  FIG. 21 is a view showing the shock absorbing mechanism 2c in a state in which a collision load is applied in the direction indicated by the arrow A, and corresponds to the cross section shown in FIG.

  As shown in FIG. 21, when a collision load is applied and the bumper reinforcement 11a is pushed to the side member 9 side, the flat portion 5 of the bolt 3 at the rear end portion of the shock absorber 1 in the initial stage of the collision, as in the first embodiment. The compression of the impact absorbing material 1 by the convex surface portion 6 and the pressing of the covering material 7 occur. Also, the bolt 3 at the front end portion of the shock absorber 1 is compressed by pressing the shock absorber 1 backward by the flat portion 5, and the covering material 7 on the side surface of the shock absorber 1 is pushed by the convex portion 6. .

  However, in this embodiment, after that, the shock absorber 1 is pushed backward by the bolt 3 at the front end portion of the shock absorber 1, and the shock absorber 1 is pushed forward by the bolt 3 at the rear end portion of the shock absorber 1. Thus, shearing of the shock absorber 1 is induced between the front end bolt 3 and the rear end bolt 3 in the vehicle width direction.

  Then, the bolt 3 at the front end and the shock absorber 1-1 at a position corresponding to the vehicle width direction move backward in the side member 9. On the other hand, the shock absorber 1-2 at a position corresponding to the bolt 3 at the rear end in the vehicle width direction advances forward toward the opening 111 in the bumper reinforcement 11a.

  In the fourth embodiment, the impact is absorbed by the occurrence of shear, and the collision load transmitted to the side member 9 can be reduced. Also in this case, the impact absorbing material 1 is prevented from being pushed apart by the flat portion 5 of each bolt 3 at the time of collision, while the convex surface portion 6 of each bolt 3 pushes the covering material 7 so that the covering material 7 is not compressed and crushed. By tearing, it becomes easy to induce a shearing of the shock absorber 1 by receiving a large load by the bolt 3, and an intended shock absorption can be realized.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

  For example, in each of the above-described embodiments, an impact absorbing mechanism is installed between the bumper reinforcement 11 and the side member 9 of the vehicle 10. The impact absorbing mechanism includes a load receiving member that receives a load at the time of collision in the vehicle 10 and the load. What is necessary is just to provide between the to-be-transmitted members transmitted, and it is not restricted to what is provided between said bumper reinforcement 11 and the side member 9. FIG. For example, for the purpose of reducing the collision load at the time of a vehicle side collision, it may be provided between the body body on the vehicle side and a battery case inside the vehicle. Further, the type of the vehicle 10 is not particularly limited.

1: Shock absorbing material 2, 2a, 2a ', 2b, 2c: Shock absorbing mechanism 3, 3a, 3a', 3b: Bolt 3c: Plate material 4: Nut 5, 5a: Plane portion 6: Convex portion 7: Covering material 7a : Casing 8: Concave part 9: Side member 10: Vehicle 11, 11a: Bumper reinforcement 12: Gap 13: Bracket 19: Compression part 25: Collar 27: Opening part 29: Narrow part 31: Center part 32: End part 110 111: Opening

Claims (7)

An impact absorbing mechanism for reducing a collision load applied to a vehicle,
Provided between a load receiving member that receives a collision load and a member to which the collision load is transmitted from the load receiving member;
A wooden columnar shock absorbing material in which one end in the member axial direction is inserted into the internal space of one of the load receiving member and the transmitted member;
A covering material that covers at least the side surface of the shock absorbing material in the member axial direction;
A first connecting member connected to the one member;
Comprising
The first connecting member has a flat surface portion or a concave surface portion facing the other member of the load receiving member and the transmitted member, and a convex surface portion or a narrow width portion facing the other member. ,
The narrow part is a part narrower than the flat part or the concave part of the first connecting member,
At the time of a collision, the flat surface portion or the concave surface portion of the first connecting material presses the impact absorbing material, and the convex surface portion or the narrow width portion of the first connecting material presses the covering material on the side surface. Shock absorption mechanism.   The shock absorbing mechanism according to claim 1, wherein the first connecting member penetrates the one end of the shock absorbing material.   The shock absorbing mechanism according to claim 1, wherein the first connecting member is in contact with an end surface of the one end of the shock absorbing material.   The impact absorbing mechanism according to any one of claims 1 to 3, wherein the first connecting member is a bar.   The shock absorbing mechanism according to claim 4, wherein the flat surface portion or the concave surface portion and the convex surface portion or the narrow width portion are formed in separate parts attached to the bar.   The impact absorbing mechanism according to any one of claims 1 to 3, wherein the first connecting member is a plate member. The other end in the member axial direction of the shock absorber is inserted into the internal space of the other member,
A second connecting member connected to the other member;
The second connecting member has a flat surface portion or a concave surface portion facing the one member, and a convex surface portion or a narrow width portion facing the one member,
The narrow portion is a portion narrower than the flat portion or the concave portion of the second connecting member,
At the time of collision, the flat surface portion or concave surface portion of the second connecting material presses the impact absorbing material, and the convex surface portion or narrow width portion of the second connecting material pushes the side surface covering material,
The said 1st connection material and the said 2nd connection material are arrange | positioned in a different position, when it sees from the member axial direction of the said shock absorber. Shock absorption mechanism.

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