JP2019108974A - Shock absorbing mechanism - Google Patents

Abstract

To provide a shock absorbing mechanism capable of suitably absorbing shock.SOLUTION: A shock absorbing mechanism 2 for reducing a collision load applied to a vehicle is provided between a bumper reinforcement 11 which receives the collision load and a side member 9 to which the collision load is transmitted from the bumper reinforcement 11. The shock absorbing mechanism 2 includes a columnar shock absorbing material 1 made of wood, and a bolt 3. The bolt 3 is connected to the side member 9, has a plane 5 facing the bumper reinforcement 11, and penetrates through a part of a rear end of the shock absorbing material 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 disclose techniques relating to an impact absorbing mechanism configured to receive an impact load at the time of a collision of a vehicle and absorb the impact.

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

International Publication No. 2014/077314 JP, 2017-7598, A

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

  The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a shock absorbing mechanism which can preferably perform shock absorption.

  In order to achieve the above object, the present invention is an impact absorbing mechanism for reducing a collision load applied to a vehicle, comprising: a load receiving member receiving the collision load; and an object to which the collision load is transmitted from the load receiving member A wooden pillar-shaped impact-absorbing member provided between transmission members, one end in the axial direction of the member being inserted into the internal space of one of the load receiving member and the member to be transmitted; And a first connecting member connected to the member, wherein the first connecting member has a flat portion or a concave portion facing the other of the load receiving member and the receiving member, The shock absorber is in contact with a part of the surface orthogonal to the member axial direction of the shock absorber and presses the shock absorber at the time of collision, and when viewed from the member axial direction of the shock absorber, the first connecting member and the first connecting member It overlaps with the first connecting member between the other member A shock absorbing mechanism, characterized in that the other coupling member which are connected to one of the members in location does not exist.

  In the present invention, the above-described first connecting member that greatly contributes to shock absorption does not have a circular cross section, but has the above-described flat portion or concave portion. This makes it difficult for the connecting member to push the shock absorber at the time of a collision, and it is possible to prevent the wooden shock absorber from being pushed by the connector and torn and to achieve the intended shock absorption.

The first connecting member penetrates, for example, the one end of the shock absorber. Alternatively, it may be in contact with the end face of the one end of the shock absorber.
In the former case, the shock absorbing material can be suitably held by the connecting member, and in the latter case, it is not necessary to open the shock absorbing material and the structure is simple.

The first connecting member may be, for example, a bar, and the flat portion or the concave portion may be formed on a component attached to the bar. Alternatively, the first connecting member may be a plate material.
As the connecting member, a rod such as a bolt can be used, and this can be suitably fixed to the load receiving member and the receiving member described above. The flat portion and the concave portion may be formed by processing a bar, but may be formed on another part attached to the bar, or by attaching another part, the flat portion etc. can be easily made to an existing product Can be added. On the other hand, when a plate material is used as the connecting member, the load can be received on a wider surface.

The end face of the one end of the shock absorber is covered, and the first connecting member presses the end face at the time of a collision, and the flat portion or the cross section orthogonal to the longitudinal direction of the first connecting member It is also desirable that the adjacent surface adjacent to the concave portion and the end surface form a predetermined angle on the side of the first connection member, and the predetermined angle be 45 degrees or more and less than 180 degrees.
Thereby, when the first connecting member presses the shock absorber at the time of a collision, the coating can be broken early, and the load received by the connecting member at the collision due to the tension of the coating is prevented from becoming unstable. It becomes possible to realize the intended shock absorption.

The other end of the shock absorber in the axial direction of the member is further inserted into the internal space of the other member, and further includes a second connecting member connected to the other member, the second connecting member Has a flat portion or a concave portion facing the one member, and contacts a part of the surface of the shock absorber orthogonal to the member axial direction to press the shock absorber at the time of a collision; The connecting member and the second connecting member are disposed at different positions when viewed from the member axial direction of the shock absorbing member, and when viewed from the member axial direction of the shock absorbing member, the second connecting member and the second connecting member are disposed. It is also desirable that there is no other connecting member connected to the other member at a position overlapping the second connecting member with the one member.
In this case, it is possible to absorb impact by shearing of the impact absorbing material, but also in this case, the above-mentioned second connecting member which greatly contributes to the impact absorption has the above-mentioned flat portion or concave portion. It becomes easy to induce shear by preventing the shock absorber from tearing.

  According to the present invention, it is possible to provide a shock absorbing mechanism capable of suitably performing shock absorption.

FIG. 5 is a schematic view showing the arrangement of a shock absorbing mechanism 2; FIG. The figure which shows the impact-absorbing mechanism 2 in the state to which the collision load was added. The figure which shows the relationship between the displacement of bumper reinforcement 11, and the load which bolt 3 receives. The figure which shows the volt | bolt 3a and the color | collar 30. FIG. The example of the cross-sectional shape of a connection material. The example of the cross-sectional shape of a connection material. The figure which shows the impact-absorbing mechanism 2a. The figure which shows the impact-absorbing mechanism 2a of the state to which the collision load was added. The figure which shows shock absorption mechanism 2a '. The enlarged view of bolt 3 vicinity. The figure which shows tension | tensile_strength and fracture | rupture of coating | cover 1a. The figure which shows the relationship between the displacement of bumper reinforcement 11, and the load which bolt 3 receives. The figure which shows the impact-absorbing mechanism 2b. 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 based on the drawings.

First Embodiment
FIG. 1 is a schematic view showing the arrangement of a shock absorbing mechanism 2 according to an embodiment of the present invention. The impact absorbing mechanism 2 is provided in the vehicle 10 and is for absorbing the impact applied to the vehicle 10 at the time of a collision to reduce the collision load. The impact 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 of FIG. 1 correspond to the vehicle longitudinal direction, and the top and bottom of 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. 1. “After” 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 front collision of the vehicle, and is arranged to extend in the vehicle width direction at the front of the vehicle 10.

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

  FIG. 2 is a view showing the shock absorbing mechanism 2. Fig.2 (a) is a figure which shows the cross section of the horizontal direction of the impact-absorbing mechanism 2, FIG.2 (b), (c) is a cross section of the perpendicular direction by line aa of FIG.2 (a) and line b-b, respectively. FIG.

  As shown in FIG. 2, the shock absorbing mechanism 2 has a shock absorber 1, a bolt 3, a casing 7 and the like.

  The impact absorbing material 1 is a wooden columnar member, and both axial ends of the member axial direction correspond to the bumper reinforcement 11 side, with the member axial direction as the vehicle longitudinal direction (corresponding to the left and right direction of FIGS. 2A and 2B). , Side member 9 side. Further, in the present embodiment, the member axial direction corresponds to the axial center direction of the annual ring of wood (the fiber direction of wood).

  The shock absorber 1 is provided inside the casing 7. The casing 7 is a cylinder made of metal such as aluminum.

  The front end portions of the shock absorber 1 and the casing 7 abut on the bumper reinforcement 11. The front end portion of the casing 7 is fixed to the bumper reinforcement 11 by a bracket 13.

  The front end portion of the side member 9 is cylindrical, and the impact absorbing material 1 and the rear end portion (one end portion) of the casing 7 are inserted into the internal space of the cylindrical portion of the side member 9 (one member) Ru.

  The bolt 3 is a headrest bolt made of metal, and is disposed to be in contact with a part of the surface (the surface shown in FIG. 2C) orthogonal to the member axial direction of the shock absorbing material 1. The bolt 3 is a bar (connector) connected to the front end of the side member 9.

  Here, when viewed from the member axial direction of the impact absorbing material 1 (see the arrow in FIG. 2A), the side overlapping the bolt 3 is located between the bolt 3 and the bumper reinforcement 11 (the other member). There is no other bolt 3 or the like (other connection member) 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 casing 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. As a result, the bolt 3 is fixed to the front end of the side member 9 and the shock absorber 1 is held by the bolt 3.

  A flat portion 5 facing the bumper reinforcement 11 is formed on the shaft portion of the bolt 3. The flat 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 axial direction of the bolt 3 (hereinafter sometimes referred to simply as a cross section) Shape. The bolts 3 are disposed at two places in the vehicle width direction (corresponding to the vertical direction in FIG. 2A), but the number and arrangement thereof are not particularly limited.

  FIG. 3 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. As shown in FIG.

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

  In the above process, the flat portion 5 can stably receive a larger load without pushing the impact absorbing material 1 apart as described above. At this time, the casing 7 prevents the sideward expansion of the impact absorbing material 1 and prevents a drop in the collision load which the bolt 3 receives.

  FIG. 4 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 impact absorbing material 1) in the above collision process, with the vertical axis being the load and the horizontal axis being the bumper reinforcement 11 side. It is the figure shown as displacement to the member 9 side.

  In the impact absorbing mechanism 2 of the present embodiment, since the bolt 3 has the flat portion 5 described above, it is possible to prevent the wood used for the impact absorbing material 1 from being torn. Therefore, as shown by the solid line 23 during the movement of the bumper reinforcement 11 in the present embodiment, as compared with the conventional example using the bolt of the circular cross section, as shown by the dotted line 21, the displacement proceeds with a low load by the wood tearing. A large load can be received stably. The impact absorption amount of the impact absorbing material 1 is represented by an integral value due to the displacement of the load shown by the solid line 23, and is significantly increased as compared with the conventional example.

  As described above, according to the first embodiment, since the bolt 3 does not have a circular cross section but has the flat portion 5, it becomes difficult for the bolt 3 to push the impact absorbing material 1 at a collision and the impact absorbing material 1 tears. It is possible to prevent shock and achieve the intended shock absorption. That is, the compression section 19 can be formed reliably at the initial stage of the collision, and a larger load can be received. After that, while the impact absorbing material 1 is sheared and deformed by the bolt 3, the fracture progresses stably, and a larger impact can be absorbed utilizing the advantage of the wood that the fluctuation of the collision load is small.

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

  Further, the plane portion 5 is not limited to one in which the shaft portion of the bolt 3 is processed to be integrally formed with the shaft portion. For example, as shown in FIG. 5 (a), a collar 30 having a flat portion 5 may be attached as a separate part around the shaft of the bolt 3a. Thereby, the flat portion 5 can be easily added to the ready-made bolt 3a. FIG. 5B is a cross section taken along line c-c in FIG. 5A, and the outer shape of the cross section of the collar 30 has a shape obtained by cutting a part of a circle with a straight line, and is a flat portion 5 similar to the first embodiment. Is formed.

  Further, in the present embodiment, metal bolts are used as the connecting members, but the connecting members may be those connected to the side members 9 and may be pins or the like instead of the bolts. The material is not limited to metal, and may be ceramic.

  In addition, the cross-sectional shape of the connecting member is not limited to that described in the first embodiment. FIG. 6 is a view showing an example of another cross-sectional shape. For example, FIG. 6A shows a shape in which a semicircle and a rectangle are combined, and the flat portion 5 is provided in the rectangle. 6 (b) has a rectangular shape, and FIG. 6 (c) has a hexagonal shape, each having a polygonal cross section, and has the plane portion 5 in the same manner as described above.

  Also, even if a concave portion is provided instead of the flat portion 5, the same effect as described above can be obtained. For example, as shown in FIG. 7A, a part of a circle is cut by an arc, or FIG. The concave portion 6 may be provided as a shape obtained by cutting a part of a rectangle with a circular arc as in FIG. Further, the concave portion is not limited to the arc-shaped curved surface, but, for example, as shown in FIG. 7C, a cross-sectional shape in which a part of a rectangle is cut in a wedge shape may be provided. . Thus, the cross-sectional shape of the connecting member may be one having the flat portion 5 or the concave portion 6 on the bumper reinforcement 11 side.

  Hereinafter, other examples of the present invention will be described as second to fifth embodiments. The respective embodiments will be described in terms of differences from the embodiments described above, and the description of the same configuration will be omitted by attaching the same reference numerals in the drawings and the like. Further, the configurations described in each embodiment, including the first embodiment, can be combined as needed.

Second Embodiment
FIG. 8 is a view showing a shock absorbing mechanism 2a of the second embodiment. Fig.8 (a) is a figure which shows the cross section of the horizontal direction of the impact-absorbing mechanism 2a, FIG.8 (b) is a figure which shows the cross section of the perpendicular direction by line dd of FIG. 8 (a).

  The shock absorbing mechanism 2a differs from the first embodiment in that the flat portion 5 of the bolt 3 is provided in contact with a part of the rear end surface (the plane orthogonal to the member axial direction) of the shock absorbing material 1.

  FIG. 9 is a view showing the shock absorbing mechanism 2a in a state where a collision load is applied in the direction shown by the arrow A. As shown in FIG. When a collision load is applied and the bumper reinforcement 11 is pressed to the side member 9 side, local compression is generated in the shock absorbing material 1 at the initial stage in this embodiment as well, and the wood is hardened and the compression portion 19 is formed. Then, the shock absorbing material 1 enters the inside of the side member 9 while being sheared by the flat portion 5 of the bolt 3.

  Also in the second embodiment, the flat portion 5 of the bolt 3 can stably receive a large load without pushing the impact absorbing material 1 apart, and the same effect as that of the first embodiment can be obtained. Furthermore, in the second embodiment, by making the flat portion 5 abut the rear end surface of the shock absorbing material 1 without penetrating the bolt 3 into the shock absorbing material 1, there is no need to make a hole in the shock absorbing material 1 etc. It has a simple configuration. In addition, the compression section 19 can be made longer, and more load can be absorbed. On the other hand, when the bolt 3 penetrates the shock absorbing material 1 as in the first embodiment, the shock absorbing material 1 can be suitably held.

Third Embodiment
In the second embodiment, the cylindrical casing 7 is provided around the shock absorbing material 1, but in the third embodiment, the casing 7 is omitted like the shock absorbing mechanism 2a 'of FIG. The entire surface of the shock absorber 1 is coated by That is, the side surfaces and both end surfaces of the shock absorber 1 in the axial direction of the member are covered, and the shock absorber 1 is protected from the outside by the cover 1 a to prevent deterioration. The flat portion 5 of the bolt 3 abuts on a part of the coated rear end surface (a surface orthogonal to the member axial direction of the shock absorbing material 1) of the shock absorbing material 1.

  FIG. 11 is an enlarged view around the bolt 3 and shows a cross section orthogonal to the axial direction (longitudinal direction) of the bolt 3. In the shock absorbing mechanism 2a ′, the shock absorption in the collision process is achieved because the adjacent surface 8 adjacent to the flat portion 5 of the bolt 3 and the coated rear end face of the shock absorber 1 form a predetermined appropriate angle θ. When the material 1 is sheared as described above, the coating 1 a of the rear end face of the impact absorbing material 1 is broken early.

  That is, also in the present embodiment, the flat portion 5 of the bolt 3 presses the rear end face of the shock absorber 1 at the time of a collision, and the portion of the shock absorber 1 at a position corresponding to the flat portion 5 in the vehicle width direction is compressed. The other portions enter the inside of the side member 9 while being sheared by the flat portion 5. At this time, as shown in FIG. 12A, if the coating 1a does not break prematurely and is pulled by the impact absorbing material 1 which has entered into the side member 9, the coating 1a is in the elastic region while being in the elastic region. The tensile force T of 1 a acts on the bolt 3 to increase the load applied to the bolt 3. Thereafter, the shock absorbing material 1 further penetrates into the side member 9, and the load applied to the bolt 3 is rapidly reduced when the coating 1a is further extended to yield. As described above, if the coating 1a does not break early, the load received by the bolt 3 at the initial stage of the collision greatly fluctuates and becomes unstable, and the intended shock absorption may not be realized.

  On the other hand, in the present embodiment, by setting the angle θ formed by the adjacent surface 8 and the coated rear end face of the shock absorbing material 1 to an appropriate value, as shown in FIG. The coating 1a can be fractured (sheared) at an early stage during the shear deformation, and the load applied to the bolt 3 can be prevented from fluctuating as described above, and the intended impact absorption can be realized.

  Here, as shown in FIG. 11, the above-mentioned angle θ is defined by the tangent C of the adjacent surface 8 at the boundary B between the flat portion 5 and the adjacent surface 8 and the coated rear end face of the shock absorbing material 1. Is the angle formed by the side of the angle .theta .. The value is less than 180 degrees. In the present embodiment, since the cross section of the bolt 3 has a shape in which a part of a circle is cut by a straight line, the angle θ changes in accordance with the cut position by the straight line. For example, when the angle θ is 90 degrees, the cross section of the bolt 3 is semicircular, but when the cross section of the bolt 3 is larger than a semicircle as shown in FIG. 11, the angle θ is less than 90 degrees.

  And in this embodiment, in order to make the coating | cover 1a break early, angle (theta) shall be 45 degrees or more. The angle θ is set to the same value (45 degrees or more in the present embodiment) on both sides of the bolt 3 in the vehicle width direction.

  FIG. 13 is a view showing the relationship between the displacement of the bumper reinforcement 11 and the load received by the bolt 3 in the third embodiment, with the vertical axis as the load and the horizontal axis as the displacement of the bumper reinforcement 11 to the side member 9 side. .

  The solid line 25 is the case where the angle θ is 45 degrees or more, and the coating 1a is broken early (see FIG. 12 (b)). A substantially constant load is applied to the bolt 3 and the collision load is It can be received stably.

  On the other hand, the dotted line 27 sets the angle θ to less than 45 degrees, and the coating 1a does not break early (see FIG. 12 (a)). There is also a possibility that the load may be increased beyond the initial assumption due to instability.

  Thus, in the third embodiment, by setting the angle θ to 45 degrees or more, when the bolt 3 presses the impact absorbing material 1 at the time of a collision, the coating 1a can be broken early. It becomes possible to prevent the load received by the bolt 3 from becoming unstable at the time of a collision due to tension or the like, and to realize the intended shock absorption.

  Also in the third embodiment, the cross-sectional shape of the connecting member is not limited to that described above. For example, it is also possible to use what has the plane part 5 as shown to FIG. 6 (a)-(c), and the thing which has the concave part 6 as shown to FIG. 7 (a)-(c). Also in this case, the range of the preferable angle θ (the angle formed by the adjacent surface 8 of the flat surface portion 5 or the concave surface portion 6 and the coated rear end surface of the shock absorbing material 1 on the side of the bolt 3) is the same as above.

  Further, the inventor has confirmed by an experiment that the coating 1a breaks early when the angle θ is 60 degrees, more preferably, by setting the angle θ to 60 degrees or more, the early breakage of the coating 1a It can be made sure.

Fourth Embodiment
FIG. 14 is a view showing an impact absorbing mechanism 2b according to the fourth embodiment. Fig. 14 (a) is a horizontal sectional view of the shock absorbing mechanism 2b, and Fig. 14 (b) is a vertical sectional view taken along the line e-e of Fig. 14 (a).

  The impact absorbing mechanism 2 b is different from the second embodiment in that a plate 3 b is used as a connecting member instead of the bolt 3. In the present embodiment, the casing 7 is omitted, and the front end portion of the shock absorbing material 1 is fixed to the bumper reinforcement 11 by the bracket 13 and the rear end portion is inserted into the cylindrical portion of the front end portion of the side member 9 .

  The plate 3 b is connected to the front end of the side member 9 and has a flat portion 5 a on the bumper reinforcement 11 side, and the flat portion 5 a abuts on a part of the rear end surface of the shock absorber 1.

  In the fourth embodiment, the flat portion 5a of the plate 3b functions in the same manner as the flat portion 5 of the bolt 3 at the time of a collision, and the same effect as the first embodiment can be obtained. Further, the load can be received on a wide surface by using the plate member 3b.

Fifth Embodiment
FIG. 15 is a view showing a shock absorbing mechanism 2c of the fifth embodiment. Fig.15 (a) is a figure which shows the cross section of the horizontal direction of the impact-absorbing mechanism 2c, FIG.15 (b), (c) is the vertical direction by line ff of FIG.15 (a) and line g-g, respectively. FIG.

  The impact absorbing mechanism 2 c is different from the first embodiment in that the impact absorbing mechanism 2 c performs impact absorption by shearing of the impact 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 enters the internal space of the bumper reinforcement 11a (the other member) from the opening 110 provided in the rear wall of the cylindrical bumper reinforcement 11a. Be inserted.

  Further, the shock absorbing mechanism 2c has a bolt 3 connected to the bumper reinforce 11a, and the shaft portion of the bolt 3 penetrates the bumper reinforcement 11a and the shock absorbing material 1 from the lower surface of the bumper reinforce 11a, and the tip of the shaft portion is a nut It is fixed to the upper surface of the bumper reinforcement 11 a by 4. The bolt 3 is disposed so that the flat portion 5 is positioned on the side member 9 side, and a gap is provided between 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 absorbing material 1 is inserted into the front end portion of the side member 9 in the same manner as described above, and the shaft portion of the bolt 3 penetrates the side member 9 and the shock absorbing material 1 from the lower surface of the side member 9 Is fixed to the upper surface of the side member 9 by the nut 4.

  Here, when viewed from the member axial direction (see the arrow in FIG. 15 (a)), the bolt 3 at the front end of the shock absorber 1 and the bolt 3 at the rear end are disposed at different positions. 5 is designed not to face each other. Further, when viewed from the axial direction of the member, another bolt 3 etc. connected to the bumper reinforcement 11 a at a position overlapping the bolt 3 at the front end between the bolt 3 at the front end of the shock absorber 1 and the side member 9 ( There is no other connecting material).

  Further, an opening 111 is formed in the front wall of the bumper reinforcement 11a at a position corresponding to the bolt 3 of the rear end portion of the impact absorbing material 1 and the vehicle width direction. In addition, the said casing 7 is abbreviate | omitted also in this embodiment.

  FIG. 16 is a view showing the shock absorbing mechanism 2c in a state where a collision load is applied in the direction shown by the arrow A. As shown in FIG.

  As shown in FIG. 16, when the collision load is applied and the bumper reinforcement 11a is pushed toward the side member 9, the compression of the shock absorbing material 1 similar to the first embodiment occurs in the initial stage of the collision (see the compression section 19). The bolt 3 at the front end portion of the shock absorbing material 1 presses the shock absorbing material 1 rearward by the flat portion 5.

  However, in the present embodiment, after that, the shock absorber 1 is pushed backward by the bolt 3 at the front end of the shock absorber 1, and the shock absorber 1 is pushed forward by the bolt 3 at the rear end of the shock absorber 1. Thus, the shear of the shock absorber 1 is induced between the bolt 3 at the front end and the bolt 3 at the rear end.

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

  In the fifth embodiment, the occurrence of shearing absorbs the impact, and the collision load transmitted to the side member 9 can be reduced. Also in this case, by preventing the impact absorbing material 1 from being torn by the flat portion 5 of the bolt 3, a large load can be received, shear is easily generated in the impact absorbing material 1, and intended impact absorption can be realized.

  As mentioned above, although the suitable embodiment concerning the present invention was described, referring to an accompanying drawing, the present invention is not limited to this example. It is apparent that those skilled in the art can conceive of various modifications or alterations within the scope of the technical idea disclosed in the present application, and of course these also fall within the technical scope of the present invention. It is understood.

  For example, although the impact absorbing mechanism is installed between the bumper reinforcement 11 and the side member 9 of the vehicle 10 in each of the above embodiments, the impact absorbing mechanism is a load receiving member for receiving a load at the time of collision in the vehicle 10 and the load It may be provided between the members to be transmitted, and is not limited to the one provided between the bumper reinforcement 11 and the side member 9 described above. For example, in order to reduce the collision load at the time of a vehicle side collision, it may be provided between the body of the vehicle side and the battery case inside the vehicle. Further, the type of the vehicle 10 is not particularly limited.

1: Impact absorbing material 1a: Coating 2, 2a, 2a ', 2b, 2c: Impact absorbing mechanism 3, 3a: Bolt 3b: Plate material 4: Nut 5 5a: Flat part 6: Concave part 7: Casing 8: Adjacent surface 9: side member 10: vehicle 11, 11a: bumper reinforcement 13: bracket 19: compression portion 21, 27: dotted line 23, 25: solid line 30: collar 110: opening

Claims (8)

An impact absorbing mechanism for reducing a collision load applied to a vehicle, comprising:
Provided between a load receiving member receiving a collision load and a receiving member to which the collision load is transmitted from the load receiving member;
A wooden columnar shock absorber inserted at one end in the axial direction of the member into the internal space of one of the load receiving member and the receiving member;
A first connecting member connected to the one member;
Equipped with
The first connecting member has a flat portion or a concave portion facing the other member of the load receiving member and the receiving member, and a portion of the surface of the shock absorbing member orthogonal to the member axial direction Contact and pressing the shock absorber at the time of a collision,
The other member connected to the one member at a position overlapping the first connecting member between the first connecting member and the other member when viewed from the member axial direction of the impact absorbing member An impact absorbing mechanism characterized by the absence of a connecting member.   The shock absorbing mechanism according to claim 1, wherein the first connecting material penetrates the one end of the shock absorbing material.   The shock absorbing mechanism according to claim 1, wherein the first connection member abuts on an end face of the one end of the shock absorber.   The shock absorbing mechanism according to any one of claims 1 to 3, wherein the first connecting member is a bar.   5. The shock absorbing mechanism according to claim 4, wherein the flat portion or the concave portion is formed on another part attached to the bar.   The shock absorbing mechanism according to any one of claims 1 to 3, wherein the first connecting member is a plate material. An end face of the one end of the shock absorber is coated;
The first connecting member presses the end face at the time of a collision,
In a cross section orthogonal to the longitudinal direction of the first connecting member, an adjacent surface adjacent to the flat portion or the concave portion and the end face form a predetermined angle on the side of the first connecting member,
The shock absorbing mechanism according to claim 4, wherein the predetermined angle is 45 degrees or more and less than 180 degrees. The other axial end of the shock absorber is inserted into the inner space of the other member,
It further comprises a second connecting member connected to the other member,
The second connecting member has a flat portion or a concave portion facing the one member, contacts the part of the surface of the shock absorbing member orthogonal to the member axial direction, and the shock absorbing member Press
The first connecting member and the second connecting member are disposed at different positions when viewed from the axial direction of the shock absorber.
The other member connected to the other member at a position overlapping with the second connecting member between the second connecting member and the one member when viewed from the member axial direction of the impact absorbing member The shock absorbing mechanism according to any one of claims 1 to 7, wherein no connecting material is present.

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