JP6827973B2 - Shock absorption mechanism - Google Patents

Description

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

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

According to Patent Documents 1 and 2, when the bumper shear is pushed toward the side member during a vehicle front collision, the wood provided between the bumper shear and the side member is pushed by a connecting material such as a bolt to be compressed. A shock absorbing mechanism in which a shock is absorbed by shearing is described.

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

In these shock absorbing mechanisms, while the bumper reinforce is displaced, a substantially constant collision load is applied to the connecting material, and the compression and shearing of the wood proceed stably. However, the fluctuation of the collision load received by the connecting material at the initial stage of the collision is large, and a large collision load is generated as compared with the above-mentioned constant collision load.

A large impact absorption effect can be obtained by arranging multiple connecting materials and increasing the compression area of the wood or increasing the shear points. However, if these connecting materials simultaneously receive the collision load at the initial stage of collision, the mechanism as a whole The fluctuation of the collision load received is larger, and the collision load generated is also larger. As a result, there is a risk that the intended shock absorbing effect cannot be obtained.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a shock absorbing mechanism capable of suitably performing shock absorption.

The present invention for achieving the above-mentioned object is a shock absorbing mechanism for reducing a collision load applied to a vehicle, and is a load receiving member that receives a collision load and a load receiving member that transmits the collision load from the load receiving member. A columnar shock absorbing portion including a wooden shock absorbing material, which is provided between the members and has one end in the axial direction of the member inserted into the internal space of one of the load receiving member and the transmitted member. And a plurality of first connecting members connected to the one member, and the distance in the member axial direction from the end face of the shock absorbing portion is different among the plurality of first connecting members. , The timing at which the plurality of the first connecting members receive the impact load from the end face is shifted, and the plurality of the first connecting members are provided with a gap when viewed from the member axial direction, and the gap is provided. , The end face side of the first connecting member and the opposite side thereof are communicated with each other, and the end portion of the first connecting member opposite to the end face, which receives the collision load first, later applies the collision load. It is a shock absorbing mechanism characterized in that it is located closer to the end face side than the end portion on the side opposite to the end face of the first connecting member to be received.

In the present invention, a plurality of connecting members receive a collision load from the end face of the shock absorbing portion, but these connecting members are arranged at different distances from the end face . As a result, the timing at which each connecting member receives the collision load can be shifted, the fluctuation of the load received by the entire mechanism at the initial stage of the collision can be reduced, and the generation of a large collision load can be suppressed.

In the present invention, by surface receiving the collision load is an end of the shock absorber, the shock absorbing mechanism can with a simple configuration.
Further, it is desirable that the first connecting member is a rod-shaped member.

It is desirable that 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.
The flat surface portion and concave surface portion of the connecting material can stably receive the collision load, and the impact absorption effect is enhanced.

It is desirable that the difference in timing at which the plurality of first connecting members receive the collision load from the end face is 1/1000 second or less.
In the present invention, by shifting the timing at which each connecting member receives the collision load, the fluctuation of the load received by the entire mechanism at the initial stage of the collision is reduced, but the timing does not need to be greatly shifted. For example, the timing is shifted by the required amount as described above. Just do it. As a result, the collision load received by the entire mechanism can be stabilized at an early stage.

The other end portion of the shock absorbing portion in the member axial direction is inserted into the internal space of the other member of the load receiving member and the transmitted member, and is connected to the other member. The first connecting material and the second connecting material are further provided with materials, 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 portion, and the members from a predetermined surface of the shock absorbing portion. It is also desirable that the timing at which the plurality of the second connecting members receive the collision load from the predetermined surface is shifted by making the distance in the axial direction different among the plurality of the second connecting members.
This makes it possible to absorb the shock by shearing the shock absorbing material. In this case as well, by shifting the timing at which the connecting material receives the collision load, it is possible to reduce the fluctuation of the collision load received by the entire mechanism at the initial stage of the collision.

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

The schematic which shows the arrangement of the shock absorption mechanism 2. The figure which shows the shock absorption mechanism 2. The figure which shows the shock absorption mechanism 2 in the state which the collision load is applied. The figure which shows the relationship between the displacement of a bumper reinforce 11 and the load which a shock absorbing mechanism 2 receives. An example of the cross-sectional shape of the flat surface portion 5. An example of the cross-sectional shape of the concave surface portion 6. The figure which shows the shock absorption mechanism 2'. The figure which shows the shock absorption mechanism 2a. The figure which shows the shock absorption mechanism 2b. The figure which shows the shock absorption mechanism 2b in the state which the collision load is applied.

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 the shock absorbing mechanism 2 according to the embodiment of the present invention. The shock absorbing mechanism 2 is provided on the vehicle 10 and is for absorbing the shock applied to the vehicle 10 at the time of a collision to reduce the collision load. The shock absorbing mechanism 2 is arranged between the bumper reinforce 11 of the front bumper (not shown) and the side member 9 of the vehicle 10.

The left and right sides of FIG. 1 correspond to the front-rear direction of the vehicle, and the top and bottom of FIG. 1 correspond to the width direction of the vehicle. 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 reinforce 11 is a load receiving member that receives a load at the time of a vehicle front collision, and is arranged so as 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 the collision load received by the bumper reinforce 11 is transmitted. The side members 9 are arranged on the left and right in the vehicle width direction, and a shock absorbing mechanism 2 is provided between each side member 9 and the bumper reinforcement 11.

FIG. 2 is a diagram showing a shock absorbing mechanism 2. FIG. 2A is a diagram showing a vertical cross section of the shock absorbing portion 12 along the member axial direction, and FIG. 2B is a diagram showing a horizontal cross section along the line aa of FIG. 2A. is there. Note that FIG. 2A is a cross section taken along the line bb of FIG. 2B.

As shown in FIG. 2, the shock absorbing mechanism 2 has a shock absorbing portion 12, a bolt 3, and the like.

The shock absorbing portion 12 is a columnar member formed by covering the shock absorbing material 1 (wood), which is a wooden columnar body, with a covering material 7, and the member axial direction is the vehicle front-rear direction (FIGS. 2A and 2B). ) Corresponding to the left-right direction), both ends in the member axial direction are arranged so as to be on the bumper reinforcement 11 side and the side member 9 side, respectively. Further, in the present embodiment, the axial direction of the member corresponds to the axial direction of the annual ring of wood (the fiber direction of wood).

The covering material 7 is provided on the side surface and both end surfaces of the shock absorbing material 12 and covers the entire surface of the shock absorbing material 1. In this embodiment, the covering material 7 is made of resin. The side surface of the shock absorbing portion 12 is a surface along the member axial direction, and the end surface of the shock absorbing portion 12 is a surface orthogonal to the member axial direction.

The front end portion of the shock absorbing portion 12 comes into contact with the bumper reinforce 11 and is fixed to the bumper reinforce 11 by the bracket 13.

The front end portion of the side member 9 has a tubular shape, and the rear end portion (one end portion) of the shock absorbing portion 12 is inserted into the internal space of the tubular portion of the side member 9 (one member).

Bolts 3 (3-1, 3-2) are metal headed bolts and are arranged behind the shock absorbing portion 12. The bolt 3 is a rod-shaped connecting member connected to the front end portion of the side member 9. A plurality of bolts 3 are arranged in the vehicle width direction (corresponding to the vertical direction in FIG. 2B). In this embodiment, two bolts 3 are arranged, but the present invention is not limited to this.

Here, when viewed from the member axial direction of the shock absorbing portion 12 (see the arrow in FIG. 2B), the side between the bolt 3 and the bumper reinforce 11 (the other member) is located at a position overlapping the bolt 3. There is no other bolt 3 or the like 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 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 portion of the side member 9.

A flat surface portion 5 facing the bumper reinforce 11 side is formed on the shaft portion of the bolt 3. In the present embodiment, the cross section (hereinafter, simply referred to as a cross section) orthogonal to the longitudinal direction of the shaft portion of the bolt 3 has a shape that is a combination of a semicircle and a rectangle, and the flat surface portion 5 is formed in a rectangular portion. The flat surface portion 5 is formed integrally with the shaft portion by processing the shaft portion of the bolt 3, but the present invention is not limited to this. For example, another component having the flat surface portion 5 may be separately attached to the shaft portion of the bolt.

As shown in FIG. 2B, the two bolts 3 are arranged at different distances in the member axial direction from the rear end surface (predetermined surface) of the shock absorbing portion 12. This difference in distance is indicated by D in the figure. In the present embodiment, the bolt 3-1 closer to the rear end surface of the shock absorbing portion 12 is in contact with the rear end surface, and the distance from the rear end surface is 0, but there may be a slight separation.

FIG. 3 is a diagram showing a shock absorbing mechanism 2 in a state where a collision load is applied in the direction indicated by the arrow A. 3 (a) and 3 (b) correspond to the cross section shown in FIG. 2 (b) above.

When a collision load is applied and the bumper reinforce 11 is pushed toward the side member 9, at the initial stage of the collision, the bolt 3-1 closer to the rear end surface of the shock absorbing portion 12 is first placed on the rear end surface as shown in FIG. 3A. It receives a collision load from and presses the shock absorber 1. As a result, the portion of the shock absorbing material 1 at the position corresponding to the bolt 3-1 in the vehicle width direction is pressed forward by the flat surface portion 5 of the bolt 3-1 and compressed.

After that, the bolt 3-2 farther from the rear end surface of the shock absorbing portion 12 receives a collision load from the rear end surface and presses the shock absorbing material 1. As a result, as shown in FIG. 3B, the portion of the shock absorbing material 1 at the position corresponding to the bolt 3-2 in the vehicle width direction is pressed forward by the flat surface portion 5 of the bolt 3-2 and compressed. Will be done.

In this way, each bolt 3 causes local compression in the shock absorbing material 1, the wood is hardened, and the compressed portion 19 is formed. After that, the shock absorbing material 1 enters the inside of the side member 9 while being sheared and deformed by the flat surface portion 5 of each bolt 3. While the bumper reinforce 11 is displaced, a substantially constant collision load (hereinafter, may be simply referred to as a load) is applied to each bolt 3, and the compression of the shock absorbing material 1 proceeds stably.

The solid line 21 in FIG. 4A shows the relationship between the displacement of the bumper reinforce 11 in the collision process and the load received by the shock absorbing mechanism 2 (the load absorbed by the compression of the shock absorbing material 1), with the vertical axis representing the load. It is a graph which showed the horizontal axis as the displacement of the bumper reinforcement 11 toward the side member 9.

Further, in the solid line 23 of FIG. 4B, the bolts 3-1 and 3-2 receive the load at the same timing at the initial stage of the collision (the distance from the rear end surface of the shock absorbing portion 12 of the bolts 3-1 and 3-2). It is a graph of the same case) and is shown as a comparison target.

The dotted line 25 in FIG. 4B shows the transition of the load received per bolt, and the maximum load is generated due to the fluctuation of the load at the initial stage of the collision, and then the load is lower than the maximum load. Stable with. If the two bolts 3 receive the load at the same timing at the beginning of the collision, the load received by the entire mechanism (the sum of the loads received by each bolt 3) is sharp at the beginning of the collision, as shown by the solid line 23 in FIG. 4 (b). When it stands up, the fluctuation becomes large, and a large maximum load is generated before the load stabilizes.

On the other hand, in the present embodiment, the distances of the two bolts 3-1 and 3-2 from the rear end surface of the shock absorbing portion 12 are different, and as shown in FIG. 4A, the difference D of the distances The timing at which the bolts 3-1 and 3-2 receive the load is deviated by the corresponding amount. By providing such a timing shift, the time when the maximum load is generated in each bolt 3-1 and 3-2 is shifted, and as a result, as shown by the solid line 21, the fluctuation of the load received by the entire mechanism at the initial stage of collision becomes small. , The generation of large load is suppressed.

The timing deviation is, for example, 1/1000 second or less, and the difference D is the distance that the bumper reinforce 11 travels in 1/1000 second at the assumed collision speed. The estimated collision speed is the speed at the time of collision of the vehicle 10, for example, determined according to the legal speed of general roads and highways, about 60 (km / h), about 80 (km / h), 100 (km / h). It can be a degree. When the assumed collision speed is 60 (km / h), the above difference D is 100/6 ≈ 16.7 (mm) or less.

As described above, according to the shock absorbing mechanism 2 of the first embodiment, the plurality of bolts 3 are arranged at different distances from the rear end surface of the shock absorbing portion 12. As a result, the timing at which each bolt 3 receives the collision load from the rear end surface of the shock absorbing portion 12 can be shifted, the fluctuation of the load received by the entire mechanism at the initial stage of the collision is reduced, and the generation of a large collision load can be suppressed. it can.

After that, the compression of the shock absorbing material 1 by the bolt 3 proceeds stably, and a larger shock can be absorbed by taking advantage of the wood that the fluctuation of the collision load is small. In particular, in the present embodiment, the flat surface portion 5 of the bolt 3 can stably receive the collision load, and the impact absorption effect is enhanced.

Further, in the present embodiment, the fluctuation of the load received by the entire mechanism at the initial stage of the collision is reduced by shifting the timing at which each bolt 3 receives the collision load, but the timing does not need to be greatly shifted, for example, 1000 minutes as described above. It should be 1 second or less, and should be shifted by the required amount. As a result, the load received by the entire mechanism can be stabilized at an early stage.

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

Further, in the present embodiment, a metal bolt is used as a connecting material, but the connecting material may be any one connected to the side member 9, and may be a pin or the like as well as a bolt. The material is not limited to metal, but may be ceramic or the like.

Further, the cross-sectional shape of the connecting material is not limited to that described in this embodiment. For example, in the present embodiment, the flat surface portion 5 is provided on the cross section of the shaft portion of the bolt 3, but the cross section may be circular like a normal bolt.

Further, when the flat surface portion 5 is provided, a cross-sectional shape obtained by cutting a part of a circle with a straight line as shown in FIG. 5 (a) or a polygonal shape (FIG. 5) as shown in FIGS. 5 (b) and 5 (c). (B) may be rectangular, and FIG. 5 (c) may be hexagonal).

Alternatively, a concave portion may be provided instead of the flat portion 5, for example, a cross-sectional shape obtained by cutting a part of a circle with an arc as shown in FIG. 6A, or a rectangular portion as shown in FIG. 6B. The concave surface portion 6 can be provided by forming the portion into a cross-sectional shape cut out by an arc. Further, the concave surface portion 6 is not limited to an arc shape, and may be provided with a concave surface portion 6 formed in a wedge shape by a straight line, for example, having a cross-sectional shape obtained by cutting a part of a rectangle into a wedge shape as shown in FIG. 6 (c).

Further, as shown in the shock absorbing mechanism 2'in FIG. 7, the bolt 3 is passed through the hole 14 provided in the shock absorbing material 1 of the shock absorbing portion 12', and the bolt 3 is arranged so as to penetrate the shock absorbing material 1. It is also possible. Also in this case, the two bolts 3 are arranged at different distances from the front wall surface 141 (predetermined surface) of each hole 14, and each bolt 3 receives the load by the amount corresponding to the difference D of the distances. The same effect as described above can be obtained by shifting the timing.

However, when the bolt 3 is arranged behind the shock absorbing portion 12 as in the present embodiment and the bolt 3 receives a collision load from the rear end surface of the shock absorbing portion 12, a hole 14 is provided in the shock absorbing material 1. There is an advantage that the shock absorbing mechanism 2 can have a simple configuration, such as no need.

Hereinafter, another example of the present invention will be described as a second and third embodiment. The differences between the embodiments and the embodiments described so far will be described, and the same configurations will be omitted by adding the same reference numerals in the drawings and the like. In addition, the configurations described in each embodiment, including the first embodiment, can be combined as needed.

[Second Embodiment]
FIG. 8 is a diagram showing a shock absorbing mechanism 2a of the second embodiment. FIG. 8A is a diagram showing a vertical cross section of the shock absorbing portion 12 along the member axial direction, and FIG. 8B is a diagram showing a horizontal cross section along the line cc of FIG. 8A. is there. Note that FIG. 8A is a cross section taken along the line dd of FIG. 8B.

This shock absorbing mechanism 2a differs from the first embodiment in that a plate material 3a is used as the connecting material instead of the bolt 3.

A plurality of plate members 3a (3a-1, 3a-2) are arranged in the vehicle width direction (corresponding to the vertical direction in FIG. 8B). In the present embodiment, two strip-shaped plate members 3a are arranged, but the present invention is not limited to this.

The plate member 3a is connected to the front end portion of the side member 9, and has a flat surface portion 5 on the bumper reinforcement 11 side. As shown in FIG. 8B, the two plate members 3a are arranged at different distances in the member axial direction from the rear end surface of the shock absorbing portion 12. The difference D of the distance is set in the same manner as in the first embodiment.

In the second embodiment, the two plate members 3a arranged at different distances from the rear end surface of the shock absorbing portion 12 function in the same manner as the two bolts 3 described above, and the entire mechanism becomes the same at the initial stage of collision. Fluctuations in the received load can be suppressed. After that, the compression of the shock absorbing material 1 proceeds as in the first embodiment, but in the present embodiment, the shock absorbing material 1 can be compressed in a wide area by using the plate material 3a, and a high shock absorbing effect can be obtained. it can.

[Third Embodiment]
FIG. 9 is a diagram showing a shock absorbing mechanism 2b according to a third embodiment. 9 (a) is a diagram showing a horizontal cross section of the shock absorbing mechanism 2b, and FIGS. 9 (b) and 9 (c) are shock absorbing portions 12 by lines ee and ff of FIG. 9 (a), respectively. It is a figure which shows the vertical cross section in the member axial direction of.

This shock absorbing mechanism 2b is different from the first embodiment in that shock absorption is performed by shearing the shock absorbing material 1.

That is, in the shock absorbing mechanism 2b, the front end portion (the other end portion) of the shock absorbing portion 12 enters the internal space of the bumper reinforce 11a (the other member) from the opening 110 provided in the rear wall of the tubular bumper reinforce 11a. Will be inserted. A gap is provided between the front end surface of the shock absorbing portion 12 and the front wall of the bumper reinforce 11a.

The shock absorbing mechanism 2b further includes bolts 3 (3-3, 3-4; connecting materials) connected to the bumper reinforce 11a in addition to the configuration of the shock absorbing mechanism 2 of the first embodiment. A plurality of the bolts 3 are arranged in the vehicle width direction (corresponding to the vertical direction in FIG. 9A). In this embodiment, two bolts 3 are arranged, but the present invention is not limited to this.

These bolts 3 are arranged in front of the shock absorbing portion 12 and are provided so that the flat surface portion 5 is located on the side member 9 side. The shaft portion of the bolt 3 penetrates the bumper reinforcement 11a from the lower surface of the bumper reinforcement 11a, and the tip of the shaft portion is fixed to the upper surface of the bumper reinforcement 11a by the nut 4.

As shown in FIG. 9A, the bolt 3 in front of the shock absorbing portion 12 is also arranged at different distances in the member axial direction from the front end surface (predetermined surface) of the shock absorbing portion 12. In the present embodiment, the difference in the distance is D, which is equal to the difference in the distance of the bolt 3 behind the shock absorbing portion 12, but is not limited to this. Further, in the present embodiment, the bolt 3-3 closer to the front end surface of the shock absorbing portion 12 is in contact with the front end surface and the distance from the front end surface is 0, but there may be a slight separation.

Here, when viewed from the member axial direction (see the arrow in FIG. 9A), the front and rear bolts 3 of the shock absorbing portion 12 are arranged at different positions so that the flat portions 5 do not face each other. ing. Further, when viewed from the member axial direction, between the bolt 3 in front of the shock absorbing material 1 and the side member 9, another bolt connected to the bumper reinforce 11a at a position overlapping the bolt 3 in front of the shock absorbing material 1. There is no 3rd magnitude.

An opening 111 is formed on the front wall of the bumper reinforce 11a at a position corresponding to the bolt 3 behind the shock absorbing portion 12 in the vehicle width direction.

FIG. 10 is a diagram showing a shock absorbing mechanism 2b in a state where a collision load is applied in the direction indicated by the arrow A, and FIGS. 10 (a) and 10 (b) correspond to the cross section shown in FIG. 9 (a).

In the present embodiment, when a collision load is applied and the bumper reinforce 11a is pushed toward the side member 9, as shown in FIG. 10A at the initial stage of the collision, the impact absorbing portion of the bolts 3 behind the impact absorbing portion 12 The bolt 3-1 closer to the rear end surface of the 12 and the bolt 3-3 closer to the front end surface of the shock absorbing portion 12 among the bolts 3 in front of the shock absorbing portion 12 receive the collision load first and absorb the impact. Press the material 1.

Since the positions of the bolts 3-1 and 3-3 in the vehicle width direction are different, the shock absorber 1 is pushed forward by the bolt 3-1 and the shock absorber 1 is pushed backward by the bolt 3-3. , The shear of the shock absorber 1 is induced between these bolts 3-1 and 3-3 in the vehicle width direction.

In the present embodiment, thereafter, the bolt 3-2 of the bolts 3 behind the shock absorbing portion 12 farther from the rear end surface of the shock absorbing portion 12 and the shock absorbing portion 12 of the bolts 3 in front of the shock absorbing portion 12 The bolt 3-4 farther from the front end surface of the bolt 3-4 receives a collision load and presses the shock absorber 1, and similarly to the above, as shown in FIG. 10B, the bolts 3-2, 3-4 in the vehicle width direction. Shearing of the shock absorber 1 is induced between them.

After that, in the shock absorbing material 1, the portion 1-1 at the position corresponding to the bolts 3-3 and 3-4 in the vehicle width direction advances rearward inside the side member 9. On the other hand, the portions 1-2 and 1-3 located at positions corresponding to the bolts 3-1 and 3-2 advance forward in the bumper reinforce 11a toward the opening 111, respectively. While the bumper reinforce 11a is displaced, a substantially constant load is applied to each bolt 3, and the shearing of the shock absorbing material 1 proceeds stably.

In the third embodiment, the impact is absorbed by the occurrence of shearing, and the collision load transmitted to the side member 9 side can be reduced. Even in this case, at the initial stage of the collision, the two bolts 3-1 and 3-2 arranged at different distances from the rear end surface of the shock absorbing portion 12 and the different distances from the front end surface of the shock absorbing portion 12 are used. By shifting the timing at which the two bolts 3-3, 3-4 arranged separately receive the collision load, the same effect as that of the first embodiment can be obtained.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified examples or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

For example, in each of the above embodiments, a shock absorbing mechanism is installed between the bumper reinforcement of the vehicle and the side member, but the shock absorbing mechanism is a load receiving member that receives a load at the time of a collision in the vehicle and a subject to which the load is transmitted. It may be provided between the transmission members, and is not limited to the one provided between the bumper reinforcement and the side member. For example, it may be provided between the body body on the side of the vehicle and the battery case inside the vehicle for the purpose of reducing the collision load at the time of collision on the vehicle side. The type of vehicle is also not particularly limited.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified examples or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1: Shock absorbing material 2, 2', 2a, 2b: Shock absorbing mechanism 3: Bolt (connecting material)
3a: Plate material (connecting material)
4: Nut 5: Flat part 6: Concave part 7: Coating material 9: Side member (transmitted member)
10: Vehicles 11, 11a: Bumper reinforce (load receiving member)
12, 12': Shock absorber 13: Bracket 14: Hole 110, 111: Opening

Claims (5)

A shock absorbing mechanism for reducing the collision load applied to the vehicle.
It is provided between the load receiving member that receives the collision load and the transmitted member that the collision load is transmitted from the load receiving member.
A columnar shock absorbing portion containing a wooden shock absorbing material, in which one end in the axial direction of the member is inserted into the internal space of the load receiving member and one of the transmitted members.
A plurality of first connecting members connected to the one member,
Equipped with
By making the distance in the member axial direction from the end face of the shock absorbing portion different for the plurality of the first connecting members, the timing at which the plurality of the first connecting members receive the collision load from the end faces is shifted .
The plurality of the first connecting members are provided with a gap when viewed from the member axial direction.
The gap communicates the end face side of the first connecting member with the opposite side thereof.
The end portion of the first connecting member that receives the collision load first and is opposite to the end face is located closer to the end face side than the end portion of the first connecting member that receives the collision load later and is opposite to the end face. A shock absorbing mechanism characterized by The shock absorbing mechanism according to claim 1, wherein the first connecting member is a rod-shaped member . The shock absorbing mechanism according to claim 1 or 2, wherein 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. The shock absorbing mechanism according to any one of claims 1 to 3, wherein the difference in timing at which the plurality of first connecting members receive a collision load from the end face is 1/1000 second or less. The other end of the shock absorbing portion in the member axial direction is inserted into the internal space of the other member of the load receiving member and the transmitted member.
A plurality of second connecting members connected to the other member are further provided.
The first connecting member and the second connecting member are arranged at different positions when viewed from the member axial direction of the shock absorbing portion.
By making the distance in the member axial direction from the predetermined surface of the shock absorbing portion different for the plurality of the second connecting members, the timing at which the plurality of the second connecting members receive the collision load from the predetermined surface can be determined. The shock absorbing mechanism according to any one of claims 1 to 4, wherein the shock absorbing mechanism is shifted.

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