JP7191710B2 - Shock absorption mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact absorbing mechanism that absorbs impact applied to a vehicle.

Patent Documents 1 and 2 describe techniques 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 toward the side member at the time of a frontal collision of the vehicle, the wood provided between the bumper reinforcement and the side member is pushed by a connecting member such as a bolt and is compressed or A shock absorbing mechanism is described in which shock is absorbed by shearing.

WO2014/077314 Japanese Patent Application Laid-Open No. 2017-7598

In some of the shock absorbing mechanisms described above, one end of a piece of wood is inserted into a cylindrical side member, and the piece of wood is arranged with its axial direction aligned with the longitudinal direction of the side member.

However, as a result of extensive studies by the present inventors, it was found that the posture of the timber at the time of collision is not necessarily limited to the above, and that there is a possibility that the timber will tilt unintentionally and the axial direction of the member will deviate from the longitudinal direction of the side member. I also understand In some cases, this tilting of the posture of the timber may have an adverse effect on the impact absorption. Ingenuity to obtain a shock absorbing effect is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shock absorbing mechanism capable of suitably absorbing shock.

To achieve the above object, the present invention provides a shock absorbing mechanism for reducing a collision load applied to a vehicle, comprising a load receiving member that receives the collision load and a receiving member to which the collision load is transmitted from the load receiving member. a wooden column-shaped shock absorbing member provided between the transmitting members and having one axial end of the member inserted into a cylindrical portion of one of the load receiving member and the transmitted member; a first connecting member that is connected to one member and presses the shock absorbing member in the event of a collision, the side surface of the shock absorbing member in the member axial direction being covered with a covering material, An inner surface of the end portion of the load receiving member and the transmitted member on the side of the other member of the shaped portion has an inclined surface that slopes away from the shock absorbing member toward the other member. , the inclined surface includes a first surface provided on the inner edge of the tip of the tubular portion of the one member on the side of the other member, and the inclined surface provided in the tubular portion following the first surface. and a second surface, and between the inclinations of the first and second surfaces, there is a difference between an arc shape and a linear shape, or when the first and second surfaces are arc shapes or a difference in inclination angle of the shock absorber with respect to the axial direction of the member when the first and second surfaces are linear .

In the shock absorbing mechanism of the present invention, the cylindrical portion into which the wood is inserted is provided with the inclined surface having the first and second surfaces, so that the intended shock absorbing effect can be obtained even if the wood is tilted at the time of collision. so that it can be In other words, without the above inclined surface, if the posture of the wood at the time of collision is tilted, the end of the cylindrical portion will bite into the covering material on the side of the wood, and there is a risk that the collision load received by the shock absorbing mechanism will become unstable at the time of collision. There is On the other hand, in the present invention, by providing the above-described inclined surface in the cylindrical portion, even if the wood is tilted at the time of collision, the covering material can be prevented from biting in, and the intended shock absorbing effect can be obtained.

When viewed along the longitudinal direction of the cylindrical portion, it is desirable that the length of the inclined surface from the tip end is 1/2 or less of the insertion length of the shock absorbing material into the cylindrical portion.
By limiting the length of the inclined surface as described above, it is possible to reliably position and fix the shock absorber when mounting the shock absorber.

For example, the first and second surfaces are arcuately inclined, and the radius of curvature of the second surface is greater than that of the first surface. Moreover, it is desirable that the radius of curvature of the second surface is 600 mm or more and 1200 mm or less.
As a result, it is possible to suitably prevent the engraving of the covering material. When the second surface is arc-shaped, the second surface can be made to correspond to various postures of the shock absorbing material at the time of collision. Also, by setting the radius of curvature of the second surface to 600 mm or more and 1200 mm or less, it is possible to achieve both the prevention of encroachment of the covering material and the fixation of the position at the time of attachment.

Alternatively, the first surface may be inclined in an arc shape, and the second surface may be inclined in a straight line, and the inclination angle of the second surface with respect to the member axial direction of the shock absorbing material is, for example, 2 degrees. Below.
This can also suitably prevent the engraving of the covering material. If the second surface is straight, the tubular portion is easier to manufacture. In this case, by setting the inclination angle of the second surface to 2 degrees or less, it is possible to satisfactorily achieve both prevention of encroachment of the covering material and fixation of the position at the time of attachment.

The other end of the shock absorbing member in the axial direction of the member is inserted into a cylindrical portion of the other member, and is connected to the other member to press the shock absorbing member in the event of a collision. , wherein the first and second connecting members are arranged at different positions when viewed from the member axial direction of the shock absorbing member, and the end of the cylindrical portion of the other member on the one member side The inner surface of the portion has an inclined surface that inclines away from the shock absorbing material as it goes toward the one member, and the inclined surface is located on the one member side of the tubular portion of the other member. a first surface provided on the inner edge of the distal end, and a second surface provided within the tubular portion following the first surface; During tilting, the difference between arcuate and linear, or the difference in radius of curvature if the first and second surfaces are arcuate, or the first and second surfaces are linear It is also desirable that there is a difference in inclination angle with respect to the member axial direction of the shock absorbing material in each case.
In this case, it is possible to absorb shock by shearing the shock absorbing material, but in this case as well, by providing the above-mentioned inclined surfaces in the cylindrical portions into which the both ends of the shock absorbing material are inserted, it is possible to prevent the covering material from biting. .

ADVANTAGE OF THE INVENTION According to this invention, the impact-absorbing mechanism which can absorb an impact suitably can be provided.

FIG. 2 is a schematic diagram showing the arrangement of the shock absorbing mechanism 2; FIG. 2 is a diagram showing a shock absorbing mechanism 2; FIG. 4 is a diagram showing an inclined surface 91 of the side member 9; The figure which shows the impact-absorbing mechanism 2 in the state to which collision load was applied. FIG. 4 is a diagram showing the inclination of the posture of the shock absorber 1; FIG. 4 is a diagram showing the inclination of the posture of the shock absorber 1; 4 is a diagram showing the relationship between the displacement of the bumper reinforcement 11 and the load received by the shock absorbing mechanism 2. FIG. Example of side member 9'. Examples of inclined surfaces 91a, 91b, 91c. The figure which shows impact-absorbing mechanism 2'. The figure which shows the impact-absorbing mechanism 2a. The figure which shows the impact-absorbing mechanism 2a in the state to which collision load was applied.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

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

Left and right in FIG. 1 correspond to the longitudinal direction of the vehicle, and up and down in 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 in FIG. "Rear" refers to the rear side of vehicle 10 and corresponds to the right side of FIG.

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

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

FIG. 2 is a diagram showing the shock absorbing mechanism 2. As shown in FIG. 2(a) is a view showing a horizontal cross section of the shock absorbing mechanism 2, and FIG. 2(b) is a view showing a vertical cross section along line aa in FIG. 2(a).

As shown in FIG. 2, the shock absorbing mechanism 2 has a shock absorbing member 1, bolts 3, and the like.

The shock absorbing material 1 is a wooden columnar member, and the axial direction of the member is the vehicle front-rear direction (corresponding to the left-right direction in FIGS. 2A and 2B), and both ends in the member axial direction are on the bumper reinforcement 11 side. , the side member 9 side. In this embodiment, the axial direction of this member corresponds to the axial direction of annual rings of wood (the fiber direction of wood), but it is not limited to this.

The shock absorbing material 1 is entirely covered with a covering material 7. - 特許庁That is, the covering material 7 is provided on the side surface and both end surfaces of the shock absorbing member 1 in the member axial direction, thereby protecting the shock absorbing member 1 from the outside and preventing deterioration. Although the coating material 7 is made of resin in this embodiment, it may be made of metal such as aluminum. The side surface of the impact absorbing material 1 is a surface along the axial direction of the member, and the end surface of the impact absorbing material 1 is a surface orthogonal to the axial direction of the member.

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

The front end of the side member 9 is tubular, and the rear end (one end) of the shock absorbing material 1 covered with the covering material 7 is attached to the tubular portion of the side member 9 (one member). inserted.

The bolt 3 is a metal headed bolt and is arranged behind the impact absorbing material 1 . The bolt 3 is a rod-shaped connecting member 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 FIG. 2(a)), but the number is not particularly limited.

Here, when viewed from the member axial direction of the shock absorbing material 1 (see the arrow in FIG. 2(a)), between the bolt 3 and the bumper reinforcement 11 (the other member), the side bolt 3 overlaps the bolt 3. Since there is no other bolt 3 or the like connected to the member 9, 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 . The bolt 3 is thereby fixed to the front end portion of the side member 9 .

A flat portion 5 facing the bumper reinforcement 11 side is formed on the shaft portion of the bolt 3 . In this embodiment, the cross section perpendicular to the longitudinal direction of the shaft portion of the bolt 3 has a shape obtained by cutting a portion of a circle with a straight line, and the plane portion 5 is formed on the straight line portion. The flat portion 5 is formed integrally with the shaft portion of the bolt 3 by processing the shaft portion of the bolt 3, but is not limited to this. For example, a separate part having the flat portion 5 may be separately attached to the shank of the bolt.

FIG. 3 is a diagram showing the side member 9. FIG. 3(a) is a perspective view showing the side member 9, and FIG. 3(b) is an enlarged view showing the vicinity of the front end portion of the side member 9 in FIG. 2(a). It should be noted that illustration of parts other than the side member 9 is omitted in FIG. 3(a).

As shown in FIG. 3, in this embodiment, an inclined surface 91 is provided on the inner surface of the front end portion of the side member 9 (the end portion on the bumper reinforcement 11 side). The inclined surface 91 is provided over the entire circumference of the tubular portion of the side member 9 .

The sloped surface 91 slopes away from the shock absorber 1 toward the bumper reinforcement 11 side (corresponding to the left side in FIG. 3(b)). When viewed along the longitudinal direction of the side member 9, the length L1 of the inclined surface 91 from the front end of the side member 9 (the tip on the bumper reinforcement 11 side) is the insertion length of the shock absorbing material ₁ into the side member 9. _1/2 or less of L2. A portion of the side member 9 behind the inclined surface 91 is in contact with the covering material 7 on the side surface of the shock absorbing material 1 .

The inclined surface 91 includes a corner radius portion 911 (first surface) provided at the inner edge of the front end of the side member 9 and a radius portion 912 (second surface) provided within the side member 9 following the corner radius portion 911 . surface).

The radius of curvature R of the rounded portion 912 is larger than the radius of curvature of the rounded portion 911 . In this embodiment, the curvature radius R of the rounded portion 912 is set to 600 mm or more and 1200 mm or less.

In this embodiment, when a collision load is applied in the direction indicated by arrow A in FIG. is pressed forward by the flat portion 5 of the bolt 3 and compressed. As a result, the impact absorbing material 1 is locally compressed, the wood is hardened, and the compressed portion 19 is formed. Thus, in this embodiment, the collision load is absorbed by compressing the shock absorbing material 1 . Other portions of the shock absorbing member 1 enter the side member 9 while undergoing shear deformation by the flat portion 5 of the bolt 3 .

Here, if the side member 9 does not have the inclined surface 91, as shown in FIG. ), the front end of the side member 9 bites into the covering material 7 .

As shown in FIG. 5(b), the covering material 7 that has bitten in is rolled up from the impact absorbing material 1 and buckled. 7 breaks or peels off. If the side member 9 does not have the inclined surface 91 , the load received by the shock absorbing mechanism 2 may become unstable due to such behavior of the covering material 7 .

On the other hand, since the front end portion of the side member 9 of this embodiment has the inclined surface 91 shown in FIG. does not eat into it. That is, in the present embodiment, even if the shock absorbing material 1 is slightly tilted at the time of collision, the shock absorbing material 1 is only in a tilted state in contact with a portion of the rounded portion 912 corresponding to the tilt. In addition, the inner edge of the front end of the side member 9 is also formed into a corner rounded portion 911 and has no corners, so that the coating material 7 does not bite into it.

FIG. 7 shows the relationship between the displacement of the bumper reinforcement 11 and the load received by the shock absorbing mechanism 2 (the load absorbed by compression of the shock absorbing material 1, etc.) during the above collision process. 11 is a diagram showing a displacement of 11 toward the side member 9. FIG.

A solid line 21 is an example in which the front end portion of the side member 9 is provided with an inclined surface 91 to prevent the covering material 7 from biting (see FIG. 4), as in the present embodiment. In this example, the collision load is mainly received by the bolts 3, but the load does not fluctuate so much that the collision load can be received relatively stably immediately after the collision.

On the other hand, the dotted line 23 is an example in which the front end portion of the side member 9 is not provided with the inclined surface 91 and the front end portion bites into the covering material 7 (see FIG. 5(b)). In this case, when the front end portion of the side member 9 bites into the covering material 7 at the initial stage of the collision and the covering material 7 is turned up and buckled, the load received by the impact absorbing mechanism 2 increases, and the covering material 7 breaks as described above. Then the load drops abruptly in reaction. Thereafter, the covering material 7 that has turned up is folded and compressed as the impact absorbing material 1 enters the side member 9, and the load received by the impact absorbing mechanism 2 increases. When the front end portion of the side member 9 bites into the covering material 7 in this manner, the load received by the impact absorbing mechanism 2 becomes unstable and causes large fluctuations.

As described above, in the shock absorbing mechanism 2 of the present embodiment, the side member 9 is provided with the inclined surface 91 having the corner rounded portion 911 and the rounded portion 912 described above. However, the intended impact absorption effect is obtained.

That is, in the absence of the inclined surface 91, the side member 9 bites into the covering member 7 if the posture of the shock absorbing member 1 is tilted at the time of collision, and the collision load received by the shock absorbing mechanism 2 becomes unstable as described above. There is fear. On the other hand, in this embodiment, by providing the side member 9 with the inclined surface 91, even if the shock absorber 1 tilts at the time of collision as described above, it is possible to prevent the covering material 7 from biting in, thereby achieving intended shock absorption. effect is obtained.

A gap is formed between the inclined surface 91 and the shock absorbing member 1, and the position of the shock absorbing member 1 at the time of attachment may become unstable. The length L1 of the shock absorber ₁ is set to _1/2 or less of the insertion length L2 of the shock absorber 1 into the side member 9, so that the shock absorber 1 can be reliably positioned and fixed when mounted. be able to.

In the present embodiment, the corner radius portion 911 and the radius portion 912 are inclined in an arc shape on the inclined surface 91, and the radius of curvature R of the radius portion 912 is larger than the radius of curvature of the corner radius portion 911. Biting of the material 7 can be suitably prevented. In addition, since the rounded portion 912 is arcuate and includes various inclinations, it can correspond to various postures of the shock absorbing material 1 at the time of collision. Furthermore, by setting the radius of curvature R of the radiused portion 912 to 600 mm or more and 1200 mm or less, it is possible to both prevent the covering material 7 from biting in and fix the position during attachment.

However, the invention is not limited to the above embodiments. For example, in the present embodiment, the metal bolts 3 are used as connecting members, but the connecting members are not limited to bolts and may be pins or the like as long as they are connected to the side members 9 . The material thereof is not limited to metal, and may be ceramic or the like.

Also, the cross-sectional shape of the connecting member is not limited to that described in the above embodiment. For example, instead of the flat portion 5, a concave portion may be provided, or a shape having a convex portion that protrudes toward the bumper reinforcement 11 side, such as a circular shape, may be used.

Further, although the inclined surface 91 is provided on the entire circumference of the tubular portion of the side member 9 in the present embodiment, it is also possible to provide the inclined surface 91 only on a part of the tubular portion of the side member 9 in the circumferential direction. Other portions are in contact with the covering material 7 on the side surface of the shock absorbing member 1, and the positional fixation of the shock absorbing member 1 can be strengthened.

The inclined surface 91 can be formed, for example, by attaching a machined part having the inclined surface 91 to the front end of the side member 9. However, as shown in FIG. Yes, and in this case, the inclined surface 91 can be formed by press working.

Furthermore, the configuration of the inclined surface 91 is not limited to that described in the above embodiment. For example, the inclined surface 91a in FIG. 9A is provided with a chamfered portion 911a (first surface) that is linearly inclined instead of the corner rounded portion 911. A similar effect can be obtained.

In the example of FIG. 9(a), the inclination angle (hereinafter simply referred to as the inclination angle) θ1 of the chamfered portion 911a with respect to the member axial direction of the shock absorbing material ₁ is set equal to the inclination angle at the front end of the rounded portion 912. I try to keep it running smoothly. However, it is not limited to this, and the inclination angle θ ₁ of the chamfered portion 911 a may be equal to or greater than the inclination angle at the front end of the rounded portion 912 .

The inclined surface 91b in FIG. 9B is provided with a linearly inclined tapered portion 912a (second surface) instead of the rounded portion 912. As shown in FIG. Also in this case, the same effect as that of the inclined surface 91 can be obtained, and there is also the advantage that the side member 9 can be manufactured easily. In the example shown in the figure, the inclination angle θ2 of the tapered portion 912a is set to ₂ degrees or less, so that both prevention of encroachment of the covering material 7 and fixation of the mounting position are favorably achieved.

In the example of FIG. 9(b), the inclination angle θ2 of the tapered portion _912a is made equal to the inclination angle of the rear end of the corner radius portion 911 so that they are smoothly continuous. However, the present invention is not limited to this, and the inclination angle at the rear end of the corner radius portion 911 may be equal to or greater _than the inclination angle θ2 of the tapered portion 912a.

On the other hand, an inclined surface 91c in FIG. 9C has a chamfered portion 911a instead of the corner rounded portion 911 and a tapered portion 912a instead of the rounded portion 912. An effect similar to that of 91 can be obtained. The inclination angle θ1 of the chamfered portion _911a is different from the inclination angle θ2 of the tapered portion _912a , and the inclination angle θ1 of the chamfered portion _911a is larger.

Further, in the present embodiment, the entire surface of the impact absorbing material 1 is covered with the coating material 7 made of resin, but as shown in the impact absorbing mechanism 2' of FIG. ' can also be applied. The casing 7' is made of metal such as aluminum and has a cylindrical shape.

Further, in this embodiment, the bolt 3 is provided behind the shock absorbing member 1 so as to press the rear end surface of the shock absorbing member 1 at the time of a collision. A bolt 3 may be provided so that the bolt 3 presses a cross section perpendicular to the member axial direction of the shock absorbing member 1 at the time of collision.

A second embodiment of the present invention will be described below. 2nd Embodiment demonstrates a different point from 1st Embodiment, A description is abbreviate|omitted by attaching|subjecting the same code|symbol in a figure etc. about the same structure. Also, the configurations described in the first and second embodiments can be combined as required.

[Second embodiment]
FIG. 11 is a diagram showing a shock absorbing mechanism 2a of the second embodiment. FIG. 11(a) is a diagram showing a horizontal cross section of the shock absorbing mechanism 2a in the same manner as FIG. 2(a), and FIGS. , cc showing a vertical cross-section.

This impact absorbing mechanism 2a differs from the first embodiment in that it absorbs impact by shearing the impact absorbing material 1. FIG.

That is, in the shock absorbing mechanism 2a, the front end (the other end) of the shock absorbing member 1 is inserted into the cylindrical portion 110 of the bumper reinforcement 11a (the other member). The bumper reinforcement 11a is a tubular member extending in the vehicle width direction, and the tubular portion 110 is arranged in the vehicle front-rear direction within the bumper reinforcement 11a.

In this embodiment, an inclined surface 111 is provided on the inner surface of the rear end portion (the end portion on the side member 9 side) of the tubular portion 110 . The configuration of the inclined surface 111 is the same as that of the inclined surface 91 described in the first embodiment, and the description thereof will be omitted.

A front end portion of the tubular portion 110 abuts on the front wall of the bumper reinforcement 11a, and a gap is provided between the front end surface of the shock absorbing member 1 and the front wall of the bumper reinforcement 11a.

The shock absorbing mechanism 2a further has a bolt 3 (connecting member) connected to the cylindrical portion 110 of the bumper reinforcement 11a in addition to the configuration of the shock absorbing mechanism 2 of the first embodiment. The bolt 3 is provided in front of the impact absorbing material 1 . The shaft portion of the bolt 3 passes through the tubular portion 110 from the lower surface of the tubular portion 110 , and the tip of the shaft portion is fixed to the upper surface of the tubular portion 110 by the nut 4 . The bolt 3 is arranged so that the flat portion 5 is positioned on the side member 9 side.

When viewed from the axial direction of the shock absorbing member 1 (see the arrows in FIG. 11(a)), the front and rear bolts 3 of the shock absorbing member 1 are arranged at different positions, and these flat portions 5 face each other. It's not supposed to.

Furthermore, when viewed from the member axial direction, between the bolt 3 in front of the shock absorber 1 and the side member 9, the cylindrical portion 110 of the bumper reinforcement 11a overlaps the bolt 3 in front of the shock absorber 1. There is no other connected bolt 3 or the like.

An opening 112 is formed in the front wall of the bumper reinforcement 11a at a position corresponding to the rear bolt 3 of the shock absorbing member 1 in the vehicle width direction.

In this embodiment, when a collision load is applied and the bumper reinforcement 11a is pushed toward the side member 9 as shown by arrow A in FIG. is pressed forward, and the bolt 3 in front of the shock absorbing member 1 presses the shock absorbing member 1 rearward by its flat portion 5, and the shock absorbing member 1 is between the front and rear bolts 3 of the shock absorbing member 1 in the vehicle width direction. Shearing of material 1 is induced.

Then, the bolt 3 in front of the shock absorbing member 1 and the shock absorbing member 1-1 at a position corresponding to the width direction of the vehicle advance inside the side member 9 rearward. On the other hand, the bolt 3 at the rear of the shock absorbing member 1 and the shock absorbing member 1 - 2 at the corresponding position in the vehicle width direction move forward toward the opening 112 in the cylindrical portion 110 .

In the second embodiment, the impact is absorbed by the generation of shear, and the collision load transmitted to the side member 9 can be reduced. In this case as well, the inclined surfaces 91 of the side members 9 and the inclined surfaces 111 of the tubular portions 110 of the bumper reinforcements 11a allow the side members 9 and the tubular portions 110 to remain as covering materials even if the posture of the shock absorber 1 is inclined at the time of a collision. It does not cut into 7.

Although the 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 obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical ideas 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, the shock absorbing mechanism is installed between the bumper reinforcement and the side members of the vehicle 10. The shock absorbing mechanism is a load receiving member that receives the load at the time of collision in the vehicle 10 and the load is transmitted. It is not limited to the one provided between the bumper reinforcement and the side member. For example, for the purpose of reducing the impact load at the time of a side collision of the vehicle, it may be provided between the body main body on the side of the vehicle and the battery case or the like inside the vehicle. Also, the type of vehicle 10 is not particularly limited.

1: shock absorbing material 2, 2', 2a: shock absorbing mechanism 3: bolt 4: nut 5: flat portion 7: covering material 7': casing 9, 9': side member 10: vehicle 11, 11a: bumper reinforcement 13 : Bracket 19: Compressed portions 91, 91a, 91b, 91c, 111: Inclined surface 110: Cylindrical portion 112: Opening 911: Corner rounded portion 911a: Chamfered portion 912: Rounded portion 912a: Taper portion

Claims (7)

A shock 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 column-shaped shock absorbing member having one end in the member axial direction inserted into a cylindrical portion of one of the load receiving member and the transmitted member;
a first connecting member that is connected to the one member and presses the shock absorbing member in the event of a collision;
and
A side surface of the impact absorbing material in the axial direction of the member is covered with a covering material,
In the cylindrical portion of the one member, an inner surface of the end portion of the load receiving member and the transmitted member on the other member side is inclined so as to move away from the shock absorbing member toward the other member side. has an inclined surface that
The inclined surface is
a first surface provided on the inner edge of the tip of the cylindrical portion of the one member on the side of the other member;
a second surface provided within the tubular portion following the first surface;
has
Between the inclinations of the first and second surfaces, there is a difference between an arcuate shape and a linear shape, or a difference in radius of curvature when the first and second surfaces are arcuate, or the first 1. A shock absorbing mechanism according to claim 1, wherein there is a difference in inclination angle of the shock absorbing member with respect to the member axial direction when the second surface is linear . The length of the inclined surface from the tip when viewed along the longitudinal direction of the tubular portion is 1/2 or less of the insertion length of the shock absorbing material into the tubular portion. The shock absorbing mechanism according to claim 1. the first and second surfaces are arcuately inclined;
3. The shock absorbing mechanism according to claim 1, wherein the radius of curvature of said second surface is larger than that of said first surface. 4. The shock absorbing mechanism according to claim 3, wherein the second surface has a radius of curvature of 600 mm or more and 1200 mm or less. the first surface is arcuately inclined,
3. The shock absorbing mechanism according to claim 1, wherein said second surface is linearly inclined. 6. The shock absorbing mechanism according to claim 5, wherein an inclination angle of said second surface with respect to the member axial direction of said shock absorbing member is 2 degrees or less. The other end of the shock absorbing material in the axial direction of the member is inserted into the cylindrical portion of the other member,
further comprising a second connecting member that is connected to the other member and presses the shock absorbing member in the event of a collision;
The first and second connecting members are arranged at different positions when viewed from the member axial direction of the impact absorbing member,
a slanted surface sloping away from the shock absorbing member toward the one member on the inner surface of the end of the cylindrical portion of the other member on the side of the one member;
The inclined surface is
a first surface provided on the inner edge of the tip of the cylindrical portion of the other member on the side of the one member;
a second surface provided within the tubular portion following the first surface;
has
Between the inclinations of the first and second surfaces, there is a difference between a circular arc and a straight line, a difference in radius of curvature when the first and second surfaces are circular, or a difference between the first and second surfaces. 2. A shock absorbing mechanism according to claim 1 , wherein there is a difference in inclination angle of said shock absorbing member with respect to the member axial direction when said second surface is linear .

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