JP2008290619A - Impact absorbing body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact absorbing body capable of attenuating both an impact to an object of comparatively low rigidity and an impact to an occupant and being easily attached to a bumper beam. <P>SOLUTION: This impact absorbing body 20 is provided with a helical outer peripheral material 28 extended in a direction roughly orthogonal to the input direction of an impact F1 free to move and a core material 26 to support the helical outer peripheral material 28 and free to guide it in the direction roughly orthogonal to the input direction of the impact F1. A plurality of left and right faces 32, 33 roughly vertical in the longitudinal direction of the core material 26 are formed on the helical outer peripheral material 28, and raised parts 45... are formed on the left and right faces 32, 33. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an impact absorber, and more particularly to an impact absorber that absorbs an impact when an impact is applied.

Automobiles have front and rear bumper beams at the front and rear of the car body so that when the front bumper beam and rear bumper beam are impacted, the front and rear bumper beams are deformed to absorb the impact. It is configured.
The occupant is protected by absorbing the impact with the front and rear bumper beams.

Here, some of the front and rear bumper beams are equipped with impact buffering members that mitigate the impact on the relatively low-rigidity object when the automobile collides with a relatively low-rigidity obstacle (object). Is known (for example, see Patent Document 1).
In the following, the front bumper beam among the front and rear bumper beams will be described as a bumper beam.

The impact buffering member of Patent Document 1 is provided along the longitudinal direction on the front surface of the bumper beam, and the cross-sectional shape is determined so as to be deformed by a relatively small impact.
By determining the cross-sectional shape so as to be deformed with a relatively small impact, when the automobile collides with a relatively low-rigidity object, the impact buffering member is deformed to reduce the impact acting on the relatively low-rigidity object. .
However, it is relatively difficult to determine the cross-sectional shape of the shock absorbing member so as to alleviate the impact acting on the relatively low-rigidity object, and the examination time is long.

By the way, it is preferable that this shock absorbing member is applied not only to the impact reduction for an object having a relatively low rigidity but also to the impact reduction for an occupant.
However, it is more difficult to determine the cross-sectional shape of the impact buffering member so that the impact buffering member is applied to both impact relaxation for a relatively low-rigidity object and impact relaxation for an occupant.

Here, in the shock absorbing member, the shock absorbing tube wound spirally is bonded and fixed to the side of the shock absorbing pad, so that when the shock is applied, the shock is first absorbed only by the shock absorbing tube, A device that absorbs an impact with an impact absorbing tube and an impact absorbing pad from the middle is known (for example, see Patent Document 2).
JP 10-217880 A

The shock absorbing tube is formed by spirally winding an aluminum core material together with a flexible material. The shock absorbing pad is made of a foaming agent.
The shock-absorbing member of Patent Document 2 can absorb the shock more suitably than the shock-absorbing member of Patent Document 1 by bonding and fixing the shock-absorbing tube to the side of the shock-absorbing pad.
Therefore, if the shock-absorbing member of Patent Document 2 is provided on the front surface of the bumper beam, it can be realized relatively easily to serve both as an impact relief for a relatively low-rigidity object and an impact relief for an occupant. Seem.

Incidentally, the shock absorbing member of Patent Document 2 combines the shock absorbing tube and the shock absorbing pad by bonding and fixing the shock absorbing tube to the side portion of the shock absorbing pad.
For this reason, the shock absorbing member of Patent Document 2 has a relatively large shape, and it is difficult to prepare for a relatively narrow space in front of the bumper beam.

In addition, it is necessary to arrange the members separately, and there is room for improvement in terms of ease of assembly and manufacturing cost.
In view of this, there is a demand for practical use of an impact buffering member that can serve both as an impact relief for a relatively low-rigidity object and an impact relief for an occupant and can be easily provided in a bumper beam or the like. It was.

  The present invention provides an impact absorber that can serve both as an impact relief for a relatively low-rigidity object and an impact relief for an occupant, and can be easily provided in a narrow space such as the front surface of a bumper beam or other parts. It is an issue to provide.

  The invention according to claim 1 is a shock absorber that absorbs an impact when the impact is applied, and a movable body that is movably extended in a direction substantially orthogonal to the input direction of the impact; A guide body that supports the moving body and can be guided in a direction substantially orthogonal to the input direction of the impact, and the moving body includes a plurality of substantially vertical sections with respect to a longitudinal direction of the guide body. A surface portion is provided, and a raised portion is formed on the surface portion.

  According to a second aspect of the present invention, the guide body guides the inside of the moving body.

  According to a third aspect of the present invention, the guide body guides the outside of the movable body.

  According to a fourth aspect of the present invention, the moving body is a member formed in a spiral shape.

  According to a fifth aspect of the present invention, the moving body includes a plurality of flat plate members formed in a substantially flat plate shape.

In the invention which concerns on Claim 1, the moving body is extended so that a movement is possible in the direction substantially orthogonal to the input direction of an impact. This moving body is supported by a guide body so that it can be guided in a direction substantially perpendicular to the input direction of impact.
Therefore, when the shock absorber collides with a relatively low-rigid rod-shaped object, the movable body can be pushed out on both sides of the rod-shaped object and moved favorably in the longitudinal direction of the guide body.

By moving the moving body, the impact can be effectively absorbed by the moving (kinetic) energy of the moving body or the frictional energy between the guide body and the moving body.
In addition, by deforming the two members of the moving body and the guide body, the impact can be effectively absorbed by the deformation energy of the two members.
Therefore, the impact can be effectively absorbed by combining the moving (kinetic) energy of the moving body, the friction energy between the guide body and the moving body, the deformation energy of the moving body and the guide body, and the like.

Furthermore, the moving body is provided with a plurality of surface portions substantially perpendicular to the longitudinal direction of the guide body. Raised portions are respectively formed on the plurality of surface portions.
Therefore, when the moving body moves, the raised portion comes into contact with the adjacent portion, and the raised raised portion is satisfactorily crushed (deformed).

By crushing the raised portion, the width of the moving body can be reduced. Therefore, the moving amount of the moving body can be increased, and the moving body can be moved for a long time.
By moving the moving body for a long time, it is possible to absorb the energy due to the impact for a long time while keeping the energy by a constant value.
Thereby, absorption of an impact becomes impossible (it becomes what is called a bottomed state), and an impact can be relieved over a long time.

In this way, when the shock absorber collides with a relatively low-rigid rod-like object, it can absorb a combination of movement (kinetic) energy, friction energy and deformation energy, and can absorb each energy for a long time. .
Thereby, it is possible to satisfactorily reduce the impact on an object having a relatively low rigidity.

On the other hand, when the shock absorber collides with the wall-like object, the wall-like object is a wide object, so the entire surface of the shock absorber collides with the wall-like object. Therefore, the entire shock absorber is compressed and deformed to generate compression strain energy.
Thereby, the impact which acts on a passenger | crew can be relieve | moderated favorably by absorbing the impact at the time of a collision favorably with the generated compressive strain energy.

  As described above, the movable body is supported by the guide body and can be guided in a direction substantially perpendicular to the input direction of the impact, thereby reducing both impact mitigation for a relatively low rigidity object and impact mitigation for the occupant. Can also serve.

In addition, the shock absorber is configured to support the moving body with the guide body. Therefore, the two members of the moving body and the guide body can be gathered together in a compact manner.
As a result, the shock absorber can be easily provided in a narrow space such as the front surface of the bumper beam and other parts, and the assembling property and the manufacturing cost can be improved.

In the invention which concerns on Claim 2, it becomes possible to expose a moving body outside by guiding the inner side of a moving body with a guide body. Therefore, it becomes possible to receive an impact efficiently with a mobile body, and a mobile body can be moved much better along a guide body.
Thereby, movement (kinetic) energy and friction energy can be generated satisfactorily, and the impact can be absorbed better.

In the invention which concerns on Claim 3, it becomes possible to cover a moving body from the outer side by guiding the outer side of a moving body with a guide body.
Thereby, since a moving body can be attached to a guide body more easily, productivity can be improved.

In the invention which concerns on Claim 4, the member formed in the helical shape was used as a moving body.
Hereinafter, one part of the spiral moving body will be described as a winding part.
For example, when the central portion of the moving body collides with a relatively low-rigid rod-shaped object, an impact acts on the central winding portion (hereinafter referred to as “central winding portion”) of the moving body.

When the impact acts, the central winding portion is deformed into a buckled state by impact (hereinafter referred to as “buckling deformation”). The winding part located on both sides of the central winding part is pushed out to both sides by the buckled deformation winding part.
The impact is dispersed in the longitudinal direction of the guide body, and the winding portion is pushed out on both sides of the impact to move in the longitudinal direction of the guide body. Movement (kinetic) energy is generated when the winding portion moves in the longitudinal direction along the guide body.

Further, when the winding portion moves in the longitudinal direction along the guide body, a frictional force (friction energy) is generated between the guide body and the winding portion.
Furthermore, when a winding part moves to the longitudinal direction of a guide body, it moves relatively in the state which adjacent winding parts (specifically, raised parts) contacted.
Friction force (friction energy) is generated between adjacent winding parts (bumps) by moving relative to each other while the winding parts (bumps) are in contact with each other.

  Therefore, the impact energy is absorbed by the deformation energy of the moving body and the guide body, and the movement (kinetic) energy of the winding portion, the friction energy between the guide body and the winding portion, the friction energy between the winding portions, etc. Can effectively absorb the shock.

In the invention which concerns on Claim 5, the moving body was comprised with the some flat plate member.
For example, when the central portion of the moving body collides with a relatively low-rigid rod-shaped object, an impact acts on a central flat plate member (hereinafter referred to as “central flat plate member”) of the moving body.
Due to the impact, the central flat plate member is deformed into a buckled state by impact (hereinafter referred to as “buckling deformation”). The flat plate members positioned on both sides of the central flat plate member are pushed out to the both sides by the wound portions that are buckled and deformed.

The impact is dispersed in the longitudinal direction of the guide body, and the flat plate member is pushed out on both sides of the rod-like object, thereby moving in the longitudinal direction of the guide body.
Movement (kinetic) energy is generated when the flat plate member moves in the longitudinal direction along the guide body.

Further, when the flat plate member moves in the longitudinal direction along the guide body, a friction force (friction energy) is generated between the guide body and the flat plate member.
Furthermore, when the flat plate member moves in the longitudinal direction of the guide body, the adjacent flat plate members (specifically, the raised portions) move relatively with each other. Friction force (friction energy) is generated between adjacent flat plate members (bumps) by moving relative to each other while the flat plate members (bumps) are in contact with each other.

  Therefore, the impact is absorbed by the deformation energy of the moving body and the guide body, and the impact is caused by the movement (kinetic) energy of the flat plate member, the friction energy between the guide body and the flat plate member, and the friction energy between the flat plate members. It can be absorbed effectively.

In addition, by configuring the moving body with a plurality of flat plate members, the shape of the flat plate member can be made simpler than a member formed in a spiral shape.
Since the flat plate members can be individually molded (for example, injection molding), the flat plate member can be molded relatively easily.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate Fr as the front, Rr as the rear, L as the left, and R as the right according to the direction viewed from the operator.

FIG. 1 is a perspective view showing a front bumper beam provided with an impact absorber (first embodiment) according to the present invention, and FIG. 2 is a sectional view taken along line 2-2 of FIG.
The vehicle body 10 includes a left front side frame 12 at a left front portion, a right front side frame 13 at a right front portion, and a front bumper beam at a front end portion 12 a of the left front side frame 12 and a front end portion 13 a of the right front side frame 13. 15, the shock absorber 20 is provided on the front bumper beam 15.

The front bumper beam 15 includes a central portion 16 that extends in the vehicle body width direction, a left bent portion 17 that extends backward from the left end portion of the central portion 16 toward the outside, and an outward direction from the right end portion of the central portion 16. And a right bent part 18 extending in a state inclined rearward.
The front bumper beam 15 has a left bent portion 17 attached to the front end portion 12 a, a right bent portion 18 attached to the front end portion 13 a, and a shock absorber 20 provided on the central front surface 16 a of the central portion 16.

The impact absorber 20 absorbs an impact that has been applied when the impact is applied.
Specifically, the impact absorber 20 can reduce the impact on the object when colliding with a relatively low rigidity rod-like object, and can also reduce the impact on the occupant when colliding with a wall-like object. it can.

  The shock absorber 20 includes a shock absorbing member 21 that absorbs a shock when the shock is applied, and left and right support members 22 and 23 that attach the shock absorbing member 21 to the front bumper beam 15.

The left support member 22 is a member that attaches the left end portion 21 a of the shock absorbing member 21 to the central front surface 16 a of the front bumper beam 15.
The right support member 23 is a member that attaches the right end 21 b of the shock absorbing member 21 to the central front surface 16 a of the front bumper beam 15.

For example, lightweight foams made of polypropylene (PP) are used for the left and right support members 22 and 23, for example.
As an example, the left and right support members 22 and 23 are attached to the central front surface 16a of the front bumper beam 15 with a clip 24 (only the right clip is shown in FIG. 2).

FIG. 3 is a perspective view showing the shock absorbing member according to the first embodiment, and FIG. 4 is a front view showing the shock absorbing member according to the first embodiment.
The shock absorbing member 21 is spirally wound around a core material (guide body) 26 that extends in a direction substantially orthogonal to the input direction of the shock F1, and the core material 26, and the shock absorbing member 21 is directed to the input direction of the shock F1. And a spiral outer peripheral material (moving body) 28 extended so as to be movable in a substantially orthogonal direction.

The core member 26 is a rod-shaped member that supports the spiral outer peripheral member 28 and can be guided in a direction substantially orthogonal to the input direction of the impact F1.
The core member 26 is a member made of, for example, a lightweight foam made of polypropylene (PP) as a material, and having a substantially rectangular cross-sectional shape.

The spiral outer peripheral member 28 is a member formed in a spiral shape.
That is, the spiral outer peripheral member 28 is wound around the core member 26 in a spiral shape and is provided from the left end portion 26 a to the right end portion 26 b of the core member 26.
The spiral outer peripheral member 28 has a plurality of one-turn portions 31 (hereinafter referred to as “winding portions 31”) spirally wound around the core member 26, and a predetermined interval between adjacent winding portions 31, 31. The gap S is formed.

The outer peripheral member outer surface portion 35 of the spiral outer peripheral member 28 is a part that forms the outer periphery of the shock absorbing member 21.
The outer peripheral member outer surface portion 35 of the spiral outer peripheral member 28 is formed in a substantially rectangular shape with upper and lower surfaces 35a and 35b and front and rear surfaces 35c and 35d (see also FIG. 2).

By adopting a configuration in which the spiral outer peripheral member 28 is wound around the core member 26 in a spiral manner, the impact absorbing member 21 can be compactly gathered.
Thereby, the shock absorbing member 21 can be easily provided on the front bumper beam 15.

As an example, the spiral outer peripheral member 28 is a member that is harder than the core member 26.
For example, a lightweight foam made of polypropylene (PP) that is the same material as the core material 26 is used as the material of the spiral outer peripheral material 28.
The foam of the spiral outer peripheral material 28 is set to have a lower expansion ratio than the foam of the core material 26. As an example, the foam of the spiral outer peripheral material 28 is made of polypropylene having an expansion ratio of 8 times or an expansion ratio of 13.5 times. Further, as the foam of the core material 26, polypropylene having an expansion ratio of 15 times is used.

Foam is a material that can be deformed well and absorbs impact when impact is applied.
By forming the core material 26 and the spiral outer peripheral material 28 from foam, the impact resistance of the core material 26 and the spiral outer peripheral material 28 can be secured satisfactorily with a lightweight member, and a sufficient amount of shock absorption can be secured. can do.

Further, by making the helical outer peripheral material 28 a hard member as compared with the core material 26, the winding portions 31... (... indicate a plurality) of the helical outer peripheral material 28 are favorably moved in the longitudinal direction of the core material 26. Can be made.
Thereby, it is possible to sufficiently ensure the shock absorbability and the shock absorption amount of the shock absorbing member 21.

FIG. 5 is a perspective view showing the spiral outer peripheral material according to the first embodiment.
The outer periphery of the winding part 31 is formed in a substantially rectangular shape with upper and lower surfaces 31a and 31b and front and rear surfaces 31c and 31d.
The upper surface 35a of the outer peripheral material outer surface portion 35 is formed by the upper surfaces 31a of the plurality of winding portions 31, and the lower surface 35b of the outer peripheral material outer surface portion 35 is formed by the lower surfaces 31b of the plurality of winding portions 31.
A front surface 35c of the outer peripheral material outer surface portion 35 is formed by the front surfaces 31c of the plurality of winding portions 31, and a rear surface 35d of the outer peripheral material outer surface portion 35 is formed by the rear surfaces 31d of the plurality of winding portions 31.

In addition, the winding portion 31 is spirally wound around the core member 26, so that a substantially rectangular opening is formed at the center with an inner surface portion (inner side) 34.
Therefore, the winding part 31 is formed in the substantially rectangular frame.
The winding portion 31 includes a left surface portion (surface portion) 32 that is substantially perpendicular to the longitudinal direction of the core member 26 and a right surface portion (surface portion) 33 that is approximately perpendicular to the longitudinal direction of the core member 26.
That is, the spiral outer peripheral member 28 is provided with a plurality of left surface portions 32 and a plurality of right surface portions 33 that are substantially perpendicular to the longitudinal direction of the core member 26.

The left surface portion 32 has an upper portion 41 along the upper surface 31a, a lower portion 42 along the lower surface 31b, a front portion 43 along the front surface 31c, and a rear portion 44 along the rear surface 31d.
The upper portion 41 is formed in a convex curved surface along the longitudinal direction of the vehicle body, and includes a portion 45 (hereinafter referred to as a “curved raised portion”) that protrudes leftward at the approximate center of the longitudinal direction of the vehicle body.
In addition, the lower portion 42 is formed in a convex curved surface along the longitudinal direction of the vehicle body, and includes a portion 45 (hereinafter referred to as a “curved raised portion”) that protrudes to the left in the approximate center of the longitudinal direction of the vehicle body.

Further, the front portion 43 is formed in a convex curved surface along the longitudinal direction of the vehicle body, and includes a portion 45 (hereinafter referred to as a “curved raised portion”) that protrudes to the left at the approximate center in the longitudinal direction of the vehicle body.
In addition, the rear part 44 is formed in a convex curved surface along the longitudinal direction of the vehicle body, and includes a part 45 (hereinafter referred to as “curved raised portion”) that protrudes to the left at the approximate center of the longitudinal direction of the vehicle body. .
That is, the left surface portion 32 is formed with curved raised portions 45... At the upper portion 41, the lower portion 42, the front portion 43 and the rear portion 44.

  Since the right surface part 33 is a left-right symmetrical surface part with the left surface part 32, the same reference numerals as those of the left surface part 32 are given to the respective components, and the description thereof is omitted.

  Therefore, the upper surface 31a of the winding portion 31 is formed in a so-called barrel shape in which the sides on the left and right surface portions 32 and 33 side are convexly curved. Thereby, the upper surface 31a is formed so that the width dimension W2 of the center part is larger than the width dimension W1 of the front and rear end parts.

  Moreover, the lower surface 31b of the winding part 31 is formed in a so-called barrel shape in which the sides on the left and right surface parts 32 and 33 side are convexly curved. As a result, the lower surface 31b is formed such that the width W2 of the central portion is larger than the width W1 of the front and rear end portions (W1 and W2 of the lower surface 31b are not shown), similarly to the upper surface 31a.

  Furthermore, the front surface 31c of the winding portion 31 is formed in a so-called barrel shape in which the sides on the left and right surface portions 32 and 33 side are convexly curved. As a result, the front surface 31c has a central width W2 larger than the upper and lower end width W1, as with the upper surface 31a (W1 and W2 of the front surface 31c are not shown).

  In addition, the rear surface 31d of the winding portion 31 is formed in a so-called barrel shape in which the sides on the left and right surface portions 32 and 33 are convexly curved. As a result, the rear surface 31d has a width W2 at the center that is larger than the width W1 at the upper and lower ends, similarly to the upper surface 31a (W1 and W2 of the rear surface 31d are not shown).

Returning to FIG. 4, when the impact F <b> 2 acts along the core material 26 as indicated by the arrow, the spiral outer peripheral material 28 guides the inner surface portion (inside) 34 of the winding portion 31. Is done.
That is, by winding the spiral outer peripheral member 28 around the core member 26 in a spiral manner, the outer peripheral member inner surface portion (inner side) 37 of the spiral outer peripheral member 28 is guided by the core member 26.
The outer peripheral material inner surface portion 37 is a portion formed by the inner surface portions 34 of the winding portions 31.
The impact F2 is a force that acts when the impact absorber 20 collides with a relatively low-rigid rod-shaped object.

Here, as shown in FIG. 1, the left support member 22 is attached to the left end portion 21 a of the impact absorbing member 21, and the right support member 23 is attached to the right end portion 21 b of the impact absorbing member 21.
The left and right support members 22 and 23 hold the left and right end portions 28a and 28b of the spiral outer peripheral member 28 so as not to spread to the left and right sides.

Therefore, when the winding portions 31... Move in the longitudinal direction of the core member 26 due to the impact F2, the raised portions 45 of the adjacent winding portions 31 come into contact with each other.
When the raised portions 45 are in contact with each other, the contact area can be reduced. The pressing force acting on the contact area can be increased, and the raised portion 45 can be crushed (deformed) well.

Thereby, since the width dimension W2 of the center part of the winding part 31 can be made small, it becomes possible to increase the movement amount of the winding part 31 ..., and to move the winding part 31 ... over a long time. Can do.
By moving the winding portions 31 over a long period of time, the energy due to the impact can be absorbed over a long period of time while keeping the energy at a constant value.

Here, by guiding the outer peripheral member inner surface portion (inner side) 37 of the spiral outer peripheral member 28 with the core member 26, the spiral outer peripheral member 28 can be exposed to the outside.
Therefore, it becomes possible to receive an impact efficiently by the spiral outer peripheral member 28, and the spiral outer peripheral member 28 can be moved more favorably along the core member 26.
Thereby, movement (kinetic) energy and friction energy can be generated satisfactorily, and the impact can be absorbed better.

Returning to FIG. 1, as described above, the shock absorber 20 is configured to support the spiral outer peripheral member 28 with the core member 26. Therefore, the two members of the spiral outer peripheral member 28 and the core member 26 can be collected in a compact manner.
Thereby, the shock absorber 20 can be easily provided in the narrow space of the central front surface 16a of the bumper beam 15, and the assembling property and the manufacturing cost can be improved.

Next, the operation of the shock absorber 20 will be described with reference to FIGS.
First, an example in which the shock absorber 20 collides with a rod-like object (object) 50 having a relatively low rigidity will be described with reference to FIGS.
6A and 6B are diagrams illustrating an example in which the shock absorber according to the first embodiment collides with a rod-shaped object.
In (a), when the vehicle body 10 moves as indicated by the arrow A, the shock absorber 20 moves integrally with the front bumper beam 15 as indicated by the arrow A toward the rod-like object 50 having a relatively low rigidity.

  In (b), the shock absorber 20 (specifically, the shock absorbing member 21) collides with the rod-like object 50. Since the rod-like object 50 is a cylindrical object having a relatively small outer diameter, the central winding portion 31 (hereinafter referred to as “central winding portion 31 </ b> C”) of the impact absorbing member 21 collides with the rod-like object 50.

FIGS. 7A and 7B are diagrams illustrating an example in which absorption of an impact acting on a rod-like object is started by the impact absorber according to the first embodiment.
In (a), when the central winding portions 31 of the shock absorber 20 collide with the rod-like object 50, the impact acts on the front portions 38 of the central winding portions 31C.
Therefore, a buckling load acts on the central winding portions 31C, and the central winding portions 31C are buckled and deformed.
Energy (hereinafter referred to as “buckling energy”) is generated by buckling deformation of the central winding portion 31 </ b> C.

Of the central winding portions 31C, the portion 53 of the left central winding portion 31C bulges to the left, and the portion 53 presses the left winding portion 31 as indicated by an arrow B.
Therefore, the winding parts 31 on the left side start to move in the longitudinal direction of the core member 26 as indicated by the arrow B.
On the other hand, in the central winding portion 31C..., The portion 54 of the right central winding portion 31C bulges to the right, and the portion 54 presses the right winding portion 31 as indicated by an arrow C.
Therefore, the right winding part 31... Starts moving in the longitudinal direction of the core member 26 as indicated by the arrow C.
Further, when the central winding portions 31C are buckled and deformed, the front portions 55 of the core member 26 are pressed by the central winding portions 31C as indicated by an arrow D.

In (b), the left and right end portions 28a and 28b (see FIG. 4) of the spiral outer peripheral member 28 are held by the left and right support members 22 and 23 (see FIG. 1) so as not to spread to the left and right sides.
Therefore, when the winding parts 31 on the left side move in the longitudinal direction of the core member 26 as indicated by the arrow B, the adjacent raised parts 45 come into contact with each other and the contacted raised parts 45 are crushed well (deformed). ).

When the raised portions 45 are crushed, the width W2 of the left winding portions 31 can be reduced.
This makes it possible to increase the amount of movement of the left winding parts 31... And to move the left winding parts 31.

Similarly, when the right winding portions 31 shown in (a) move in the longitudinal direction of the core member 26 as indicated by the arrow C, the adjacent raised portions 45 come into contact with each other, and the raised portions 45. Crushes well (deforms).
When the raised portions 45 are crushed, the width W2 (not shown) of the right winding portions 31 can be reduced.
This makes it possible to increase the amount of movement of the right winding parts 31... And to move the right winding parts 31.

FIGS. 8A and 8B are diagrams for explaining an example in which an impact acting on a rod-like object is absorbed halfway by the impact absorber according to the first embodiment.
In (a), the amount of buckling deformation of the central winding portion 31C... Is larger than that in FIG.
Therefore, the winding parts 31 on the left side move in the longitudinal direction of the core member 26 as indicated by the arrow B.
Further, the right winding part 31... Moves in the longitudinal direction of the core member 26 as indicated by an arrow C.
As a result, movement (kinetic) energy is generated by the movement of the winding portions 31... And frictional force (friction energy) is generated between the moving winding portions 31.

Here, in the state where the raised portions 45 are kept in contact with each other, the winding portions 31... Move in the longitudinal direction of the core material 26 (that is, the arrow B direction and the arrow C direction). The adjacent raised portions 45, 45 move relative to each other in contact with each other.
By moving relative to each other with the adjacent raised portions 45 and 45 in contact with each other, movement (kinetic) energy is generated, and frictional force (friction energy) is generated between the adjacent raised portions 45 and 45.

Here, the spiral outer peripheral member 28 is wound around the core member 26 in a spiral shape. Therefore, when the adjacent winding parts 31 and 31 are in contact with each other, the twisting force is generated in the spiral outer peripheral material 28 as indicated by the arrow E and the arrow F by moving in the arrow B direction and the arrow C direction.
Here, the spiral outer peripheral member 28 has a rear surface 35d (see FIG. 2) in contact with the central portion 16. Therefore, when a twisting force is generated in the spiral outer peripheral member 28, the generated twisting force is consumed for the longitudinal deformation of the core member 26.
As described above, energy (hereinafter referred to as “twisting energy”) is generated when the core member 26 is deformed in the longitudinal direction by the twisting force generated in the spiral outer peripheral member 28.

On the other hand, as the amount of buckling deformation of the central winding portions 31C increases, the front portion 55 of the core member 26 is pressed as indicated by the arrow D by the central winding portions 31C. Thereby, the front part 55 of the core material 26 is compressively deformed.
Compressive strain energy is generated when the front portion 55 of the core material 26 is compressively deformed.

In (b), the buckling deformation amount of the central winding portion 31C... Is larger than that in FIG. 8A, and the compressive deformation amount of the front portion 55 in the core member 26 is larger than that in FIG.
By increasing the amount of compressive deformation, the portion 53 of the left central winding portion 31C of the central winding portion 31C. Therefore, a portion near the rear portion 39 of the left winding portion 31 is pressed at the portion 53 as indicated by an arrow B.
A portion near the rear portion 39 of the left winding portion 31 moves as indicated by an arrow B in the longitudinal direction of the core member 26.

On the other hand, as the amount of compressive deformation increases, the portion 54 of the central winding portion 31C on the right side of the central winding portion 31C. Therefore, a portion near the rear portion 39 of the right winding portion 31 is pressed at the portion 54 as indicated by an arrow C.
A portion near the rear portion 39 of the right winding portion 31 moves as indicated by an arrow C in the longitudinal direction of the core member 26.
As a result, movement (kinetic) energy is generated by the movement of the winding portions 31... And frictional force (friction energy) is generated between the moving winding portions 31.

In addition, the portions near the rear portion 39 of the left and right winding portions 31 move in the longitudinal direction of the core member 26 (that is, the arrow B direction and the arrow C direction), so that the adjacent winding portions 31 and 31 are adjacent to each other. Move relative to each other in contact.
When the adjacent winding parts 31, 31 are in relative contact with each other, movement (kinetic) energy is generated, and frictional force (friction energy) is generated between the adjacent winding parts 31, 31. To do.

FIGS. 9A and 9B are diagrams for explaining an example in which the shock absorber according to the first embodiment sufficiently absorbs the impact acting on the rod-like object.
8A, the buckling deformation amount of the central winding portion 31C... Is larger than that in FIG. 8B, and the compressive deformation amount of the front portion 55 of the core member 26 is larger than that in FIG.

Since the winding part 31 is helically connected, the rear part 39 of the left winding part 31 is pulled toward the central winding part 31C by increasing the amount of buckling deformation of the central winding part 31C. .
Therefore, the rear part 39 of the left winding part 31 is bent and deformed.
Although not shown, the rear portion 39 (the portion on the back side of the drawing) of the right winding portion 31 is similarly pulled toward the central winding portion 31C.
Therefore, the rear part 39 of the right winding part 31 is bent and deformed.
Energy (hereinafter referred to as “bending energy”) is generated by bending the rear portions 39 of the left and right winding portions 31.

In (b), the buckling deformation amount of the central winding portion 31C... Is larger than that in FIG. 9A, and the compressive deformation amount of the front portion 55 of the core member 26 is larger than that in FIG.
The central winding portions 31C, which are buckled and deformed, come into contact with each other at the contact portions 59. In this state, the central winding portion 31C is further compressed by the rod-like object 50.
As a result, the contact portions 59 of the central winding portions 31C are compressed and deformed, and compressive strain energy is generated.

Thus, when the shock absorber 20 collides with the rod-like object 50, buckling energy, movement (kinetic) energy, friction energy, bending energy, and compressive strain energy are generated on the spiral outer peripheral member 28 of the shock absorber 20. .
Further, torsional energy and compressive strain energy are generated in the core material 26 of the shock absorber 20.
Further, friction energy is generated between the spiral outer peripheral member 28 and the core member 26.
Thereby, an impact can be effectively absorbed with each generated energy.

Next, the amount of shock absorption when the shock absorber 20 collides with the rod-like object 50 will be described based on the graph of FIG.
FIG. 10 is a graph for explaining the relationship between the impact and the displacement amount in the shock absorber according to the first embodiment. The vertical axis represents the impact (Kgf), and the horizontal axis represents the displacement (mm) of the shock absorber 20. Graph G1 shows a shock absorption example of the comparative example, and graph G2 shows a shock absorption example of the example.

The comparative example is a rod-shaped impact absorbing member 100 formed in the same shape as the outer peripheral material outer surface portion 35 of the first embodiment. The comparative example is formed of a 13.5 times foam material made of PP.
An example is an impact absorbing member 21 in which the core member 26 and the spiral outer peripheral member 28 of the first embodiment are formed of a PP foam. The spiral outer peripheral material 28 is a 13.5-fold foam material made of PP, and the width dimension W2 of the central portion of the winding portion 31 is formed to be 60 mm.

When the impact absorbing member 100 of the comparative example collides with the rod-like object 50, the impact F1 acts on the central portion of the impact absorbing member 100.
When the impact F1 acts on the impact absorbing member 100, the impact absorbing member 100 is deformed and absorbs impact energy.

As shown in the graph G1, when the impact F1 is applied to the impact absorbing member 100, only a small amount of deformation L1 can be secured. Therefore, when the deformation amount reaches L1, the shock cannot be absorbed (so-called bottomed state), and the shock cannot be relaxed for a long time.
For this reason, the impact absorbing member 100 of the comparative example can absorb only a small amount of impact energy -E1.

On the other hand, when the impact absorbing member 21 of the embodiment collides with the rod-like object 50, the impact F1 acts on the central portion of the impact absorbing member 21.
When the impact F1 acts on the impact absorbing member 21, the impact absorbing member 21 is deformed to absorb impact energy.

As shown in the graph G2, when the shock F1 is applied to the shock absorbing member 21, a large amount of deformation L2 can be secured. Therefore, until the deformation amount reaches L2, the shock cannot be absorbed (so-called bottomed state), and the shock can be relaxed for a long time.
Thereby, the impact absorbing member 21 of the embodiment can absorb a large amount of impact energy -E2, and can further alleviate the impact acting on the rod-like object 50.

Next, an example in which the shock absorber 20 collides with the wall-like object (object) 51 will be described with reference to FIGS.
FIGS. 11A and 11B are diagrams illustrating an example in which the shock absorber according to the first embodiment collides with a wall-like object.
In (a), when the vehicle body 10 moves as indicated by an arrow G, the shock absorber 20 moves together with the front bumper beam 15 toward the wall-like object 51 as indicated by an arrow G.

  In (b), the shock absorber 20 collides with the wall-like object 51. Since the wall-like object 51 is a wide object, the entire surface of the shock absorber 20 collides with the wall-like object 51.

FIGS. 12A and 12B are diagrams illustrating an example in which an impact acting on the vehicle body is absorbed by the impact absorber according to the first embodiment.
In (a), the shock absorber 20 is supported by left and right support members 22 and 23 so that the left and right end portions 28a and 28b of the spiral outer peripheral member 28 do not spread to the left and right sides.
Therefore, when the entire surface of the shock absorber 20 collides with the wall-like object 51, it is possible to suppress the front portions 38 of the winding portions 31.
The front portions 38 of the winding portions 31 are compressed and deformed, and the winding portions 31 are buckled and deformed.
At the same time, the core member 26 is compressed and deformed.
Since the left and right support members 22 and 23 are foams made of PP, they buckle and deform similarly to the winding portions 31.

12B, the amount of buckling deformation of the winding portions 31... Is larger than that in FIG. 12A, and the amount of compressive deformation of the core member 26 is larger than that in FIG.
Further, the rear portions 39 of the winding portions 31 are compressed and deformed.

Thus, the impact is caused by the compressive strain energy generated by the compressive deformation of the winding portions 31, the compressive strain energy generated by the compressive deformation of the core member 26, and the buckling deformation energy generated by the buckling deformation of the winding portions 31. To absorb.
Thereby, an impact can be absorbed favorably and the impact which acts on a crew member can be eased favorably.

As described with reference to FIGS. 6 to 12, the spiral outer peripheral member 28 of the shock absorber 20 is supported by the core member 26 so that it can be guided in a direction substantially orthogonal to the input direction of the shock.
Thereby, the shock absorber 20 can serve both as a shock relaxation for the rod-like object (object) 50 having a relatively low rigidity and a shock relaxation for the occupant.

Next, second to fifth embodiments will be described with reference to FIGS.
In addition, in the structure of 2nd-5th embodiment, the same code | symbol is attached | subjected about the same / similar member as the shock absorber 20 of 1st Embodiment, and description is abbreviate | omitted.

(Second Embodiment)
13 is a perspective view showing an impact absorber (second embodiment) according to the present invention, and FIG. 14 is a sectional view taken along line 14-14 of FIG.
In the shock absorber 70 of the second embodiment, the spiral outer peripheral material 28 of the first embodiment is housed in a housing material (guide body) 72.

The accommodating material 72 includes an upper wall 73, a lower wall 74, and a rear wall 75 formed in a substantially U-shaped cross section, and left and right side walls 76, 77 formed at left and right ends. As the material 72, for example, a lightweight foam made of polypropylene (PP) is used.
The upper and lower walls 73 and 74, the rear wall 75, and the left and right side walls 76 and 77 form a storage space 78 (see FIG. 14). By storing the spiral outer peripheral material 28 in the storage space 78, the spiral outer peripheral material 28 is supported by the storage material 72.

Left and right clips 24 (the right clip 24 is not shown) are provided on the rear wall 75.
By attaching the left and right clips 24 to the central front surface 16a of the front bumper beam 15, the accommodating material 72 is attached to the central front surface 16a.

The accommodating material 72 supports the spiral outer peripheral material 28 so that it can be guided in a direction substantially orthogonal to the input direction of the impact F1.
When the impact F <b> 2 acts along the housing material 72 as indicated by the arrow, the outer circumferential material outer surface portion (outer side) 35 is guided in the longitudinal direction of the housing material 72.

According to the shock absorber 70 of the second embodiment, it is possible to cover the spiral outer peripheral member 28 from the outside by guiding the outer peripheral member outer surface portion 35 of the spiral outer peripheral member 28 with the accommodating member 72.
Thereby, since the helical outer peripheral material 28 can be more easily attached to the accommodating material 72, productivity can be improved.
In addition, according to the shock absorber 70 of the second embodiment, the same effects as those of the shock absorber 20 of the first embodiment can be obtained.

(Third embodiment)
FIG. 15 is an exploded perspective view showing a shock absorber (third embodiment) according to the present invention.
The shock absorber 80 of the third embodiment uses a moving body 82 instead of the spiral outer peripheral member 28 of the first embodiment, and other configurations are the same as those of the shock absorber 20 of the first embodiment. It is.
The moving body 82 is composed of a plurality of flat plate members 83 formed in a substantially flat plate shape.
The flat plate member 83 is a substantially rectangular frame formed in a substantially flat plate shape, and can have a simple shape as compared with the spiral outer peripheral member 28 of the first embodiment.

Specifically, the outer periphery of the flat plate member 83 is formed in a substantially rectangular shape with upper and lower surfaces 83a and 83b and front and rear surfaces 83c and 83d, and a substantially rectangular opening is formed in the center with an inner surface portion (inner side) 84. ing.
A plurality of flat plate members 83 are supported by the core member 26 by fitting the opening formed by the inner surface portion 84 to the core member 26.

The flat plate member 83 has a left surface portion (surface portion) 86 that is substantially perpendicular to the longitudinal direction of the core member 26 and a right surface portion (surface portion) 87 that is approximately perpendicular to the longitudinal direction of the core member 26.
That is, the moving body 82 is provided with a plurality of left surface portions 86 and a plurality of right surface portions 87 that are substantially perpendicular to the longitudinal direction of the core member 26.

The left surface portion 86 has an upper portion 91 along the upper surface 83a, a lower portion 92 along the lower surface 83b, a front portion 93 along the front surface 83c, and a rear portion 94 along the rear surface 83d.
The upper portion 91 is formed in a convex curved surface along the longitudinal direction of the vehicle body, and includes a portion (hereinafter referred to as a “curved raised portion”) 95 that protrudes to the left in the approximate center of the longitudinal direction of the vehicle body.
The lower part 92 includes a convexly curved surface that is formed along the longitudinal direction of the vehicle body, and includes a part (hereinafter referred to as a “curved raised portion”) 95 that protrudes to the left in the approximate center of the longitudinal direction of the vehicle body.

Further, the front portion 93 includes a portion (hereinafter referred to as a “curved raised portion”) 95 that is formed in a convex curved surface along the longitudinal direction of the vehicle body and protrudes in the left direction substantially at the center in the longitudinal direction of the vehicle body.
In addition, the rear part 94 is formed in a convex curved surface along the front-rear direction of the vehicle body, and includes a part (hereinafter referred to as a “curved raised part”) 95 that protrudes leftward at the approximate center of the front-rear direction of the vehicle body. .
That is, the left surface portion 86 is formed with raised portions 95... At the upper portion 91, the lower portion 92, the front portion 93 and the rear portion 94.

  Since the right surface portion 87 is a left-right symmetrical surface portion with respect to the left surface portion 86, the same reference numerals as those of the left surface portion 86 are given to the respective constituent portions, and description thereof is omitted.

  Therefore, the upper surface 83a of the flat plate member 83 is formed in a so-called barrel shape in which the sides on the left and right surface portions 86 and 87 are convexly curved. Thereby, the upper surface 83a is formed such that the width dimension W2 of the central portion is larger than the width dimension W1 of the front and rear end portions.

  Further, the lower surface 83b of the flat plate member 83 is formed in a so-called barrel shape in which the sides on the left and right surface portions 86 and 87 are convexly curved. As a result, the lower surface 83b has a width W2 at the center that is larger than the width W1 at the front and rear ends, as with the upper surface 83a (W1 and W2 on the lower surface 83b are not shown).

  Further, the front surface 83c of the flat plate member 83 is formed in a so-called barrel shape in which the sides on the left and right surface portions 86 and 87 are convexly curved. As a result, the front surface 83c is formed such that the central width W2 is larger than the width W1 of the upper and lower end portions (W1 and W2 of the front surface 83c are not shown) in the same manner as the upper surface 83a.

  In addition, the rear surface 83d of the flat plate member 83 is formed in a so-called barrel shape in which the sides on the left and right surface portions 86 and 87 are convexly curved. As a result, the rear surface 83d has a width W2 at the central portion larger than the width W1 at the upper and lower ends, similarly to the upper surface 83a (W1 and W2 of the rear surface 83d are not shown).

When the moving body 82 is supported by the core member 26 and the impact F2 acts along the core member 26 as indicated by the arrow, the inner surface portion 84 of the flat plate member 83 is guided in the longitudinal direction of the core member 26. The
That is, by fitting the moving body 82 to the core member 26, the outer peripheral material inner surface portion (inner side) 88 of the moving body 82 is guided by the core member 26.
The outer peripheral material inner surface portion 88 is a portion formed by the inner surface portions 84 of the flat plate members 83.
The impact F2 is a force that acts when the impact absorber 80 collides with a relatively low-rigid rod-shaped object.

Here, the left and right ends of the moving body 82 are respectively held by the left and right support members 22 and 23 (see FIG. 16).
Therefore, when the flat plate members 83... Move in the longitudinal direction of the core member 26 due to the impact F2, the raised portions 95 of the adjacent flat plate members 83 come into contact with each other.
When the raised portions 95 are in contact with each other, the contact area can be reduced. The pressing force acting on the contact area can be increased, and the raised portion 95 can be crushed (deformed) well.

Thereby, since the width dimension W2 of the center part of the flat plate member 83 can be made small, it becomes possible to increase the moving amount | distance of the flat plate member 83 ..., and can move the flat plate member 83 ... over a long time.
By moving the flat plate members 83 over a long period of time, the energy due to the impact can be absorbed over a long period of time while keeping the energy at a constant value.

FIGS. 16A and 16B are diagrams illustrating an example in which the shock absorber according to the third embodiment collides with an object.
In (a), the central portion of the moving body 82 collides with the rod-like object 50 having a relatively low rigidity as indicated by an arrow H. In this case, an impact F1 (see FIG. 3) acts on the central flat plate member 83C (hereinafter referred to as “central flat plate member 83C...”) Of the moving body 82.
When the impact F1 acts, the central flat plate member 83... Is deformed into a buckled state (hereinafter referred to as “buckling deformation”) by the impact F1. The flat plate members 83 located on both sides (left and right sides) of the central flat plate members 83C are pushed out to the left and right sides by the central flat plate members 83C which are buckled and deformed.

The impact F <b> 1 is dispersed in the longitudinal direction of the core material 26 (see FIG. 15), and the flat plate members 83 are pushed to both sides of the rod-like object 50, thereby moving in the longitudinal direction of the core material 26.
Movement (kinetic) energy is generated by the movement of the flat plate members 83 in the longitudinal direction along the core member 26.

Further, as the flat plate members 83 move in the longitudinal direction along the core member 26, a frictional force (friction energy) is generated between the core member 26 and the flat plate members 83.
Furthermore, when the flat plate members 83 are moved in the longitudinal direction of the core member 26, the adjacent flat plate members 83 (specifically, the raised portions 95 shown in FIG. 15) are relatively moved.
Relative movement with the flat plate members 83 (bumps 95) in contact with each other generates a frictional force (friction energy) between the adjacent flat plate members 83 (bumps 95).

  Therefore, the impact F1 is absorbed by the deformation energy of the moving body 82 and the core member 26, and the movement (kinetic) energy of the flat plate member 83, the friction energy between the core member 26 and the flat plate member 83, and the flat plate members 83 ( The impact F1 can be effectively absorbed by the frictional energy between the raised portions 95).

In (b), the shock absorber 80 collides with the wall-like object 51 as indicated by an arrow I. In this case, since the wall-like object 51 is a wide object, the entire surface of the shock absorber 80 collides with the wall-like object. Therefore, the entire shock absorber 80 is compressed and deformed to generate compression strain energy.
Thereby, the impact which acts on a passenger | crew can be relieve | moderated favorably by absorbing the impact at the time of a collision favorably with the generated compressive strain energy.

  In this way, the moving body 82 is supported by the core member 26 (see FIG. 15) and can be guided in a direction substantially perpendicular to the input direction of the impact, thereby reducing the impact on the relatively low-rigidity object 50. , It can also serve as both impact mitigation for passengers.

That is, according to the shock absorber 80 of the third embodiment, the same effect as that of the shock absorber 20 of the first embodiment can be obtained.
In addition, according to the shock absorber 80 of the third embodiment, the movable body 82 is composed of a plurality of flat plate members 83, so that the flat plate member 83 is compared with the spiral outer peripheral member 28 of the first embodiment. And it can be made a simple shape.
Since the flat plate members 83 can be individually molded (for example, injection molding), the flat plate member 83 can be formed relatively easily.

(Fourth embodiment)
FIG. 17 is a front view showing an impact absorber (fourth embodiment) according to the present invention.
The shock absorber 100 of the fourth embodiment uses a spiral outer peripheral material (moving body) 102 instead of the spiral outer peripheral material 28 of the first embodiment, and other configurations are the impacts of the first embodiment. It is the same as the absorber 20.

The spiral outer peripheral member 102 is wound around the core member 26 in a spiral manner, and is provided from the left end portion 26a to the right end portion 26b (see FIG. 3) of the core member 26.
The spiral outer peripheral material 102 has a plurality of one-turn portions 104 (hereinafter referred to as “winding portions 104”) wound spirally around the core material 26, and a predetermined interval between the adjacent winding portions 104, 104. The gap S is formed.

The winding portion 104 is obtained by replacing the raised portions 45 of the left and right surface portions 32, 33 with the raised portions 105, and the other configuration is the same as the winding portion 31 of the first embodiment.
The raised portion 105 is a portion raised in a mountain shape instead of the curved raised portion.

  According to the shock absorber 100 of the fourth embodiment, the same effects as those of the shock absorber 20 of the first embodiment can be obtained.

(Fifth embodiment)
FIG. 18 is a front view showing an impact absorber (fifth embodiment) according to the present invention.
The shock absorber 110 of the fifth embodiment uses a spiral outer peripheral material (moving body) 112 instead of the spiral outer peripheral material 28 of the first embodiment, and the other configurations are the impacts of the first embodiment. It is the same as the absorber 20.

The spiral outer peripheral member 112 is wound around the core member 26 in a spiral manner, and is provided from the left end portion 26a to the right end portion 26b (see FIG. 3) of the core member 26.
The spiral outer circumferential member 112 has a plurality of one-turn portions 114 (hereinafter referred to as “winding portions 114”) spirally wound around the core member 26, and a predetermined gap is provided between the adjacent winding portions 114 and 114. The gap S is formed.

The winding portion 114 is obtained by replacing the raised portions 45... Of the left and right surface portions 32 and 33 with the raised portions 115. The other configurations are the same as those of the winding portion 31 of the first embodiment.
The raised portion 115 is formed by a pair of portions 116 and 116 raised in a mountain shape instead of the curved raised portion.

  According to the shock absorber 110 of the fifth embodiment, the same effects as those of the shock absorber 20 of the first embodiment can be obtained.

  In the first to fifth embodiments, examples in which the shock absorbers 20, 70, 80, 100, and 110 are applied to the front bumper beam 15 have been described. However, the present invention is not limited to this, and the present invention is not limited to this. It can also be applied to other narrow spaces such as inside.

  In the first to fifth embodiments, the guide bodies 26, 72 and the moving bodies 28, 82, 102, 112 are described as being formed of the same material. However, the guide bodies 26, 72 and the moving body 28 are formed. , 82, 102, and 112 can be formed of different materials.

  Furthermore, even if the winding portions 104 and 114 exemplified in the fourth and fifth embodiments are formed in a substantially flat plate shape like the flat plate member 83 described in the third embodiment, the same effect can be obtained. Can do.

In addition, in the shock absorber 80 of the third embodiment, an example in which a plurality of flat plate members 83 are fitted to and supported by the core member 26 has been described. It is not limited to.
For example, a plurality of flat plate members 83 can be accommodated in the accommodation material 72 of the second embodiment. In this case, the same effect can be obtained.
In the configuration in which a plurality of flat plate members 83 are housed in the housing material 72, it is possible to remove the inner surface portion 84 of the flat plate member 83 and omit the central opening. In this case, it is preferable that the portion where the opening is omitted is formed in a state of being recessed with respect to the raised portion 95.

  The shock absorber of the present invention is particularly suitable for application to an automobile equipped with a front bumper beam, a rear bumper beam, and the like.

It is a perspective view which shows the front bumper beam provided with the shock absorber (1st Embodiment) which concerns on this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a perspective view which shows the impact-absorbing member which concerns on 1st Embodiment. It is a front view which shows the impact-absorbing member which concerns on 1st Embodiment. It is a perspective view which shows the spiral outer peripheral material which concerns on 1st Embodiment. It is a figure explaining the example which the impact-absorbing body which concerns on 1st Embodiment collides with a rod-shaped object. It is a figure explaining the example which starts absorption of the impact which acts on a rod-shaped object with the shock absorber which concerns on 1st Embodiment. It is a figure explaining the example which absorbs the impact which acts on a rod-shaped object with the impact absorber which concerns on 1st Embodiment to the middle. It is a figure explaining the example which fully absorbs the impact which acts on a rod-shaped object with the shock absorber concerning a 1st embodiment. It is a graph explaining the relationship between the impact and the displacement amount in the shock absorber according to the first embodiment. It is a figure explaining the example which the impact-absorbing body which concerns on 1st Embodiment collides with a wall-shaped object. It is a figure explaining the example which absorbs the impact which acts on a vehicle body with the shock absorber which concerns on 1st Embodiment. It is a perspective view which shows the shock absorber (2nd Embodiment) which concerns on this invention. FIG. 14 is a cross-sectional view taken along line 14-14 of FIG. It is a disassembled perspective view which shows the shock absorber (3rd Embodiment) which concerns on this invention. It is a figure explaining the example which the impact-absorbing body which concerns on 3rd Embodiment collides with an object. It is a front view which shows the shock absorber (4th Embodiment) which concerns on this invention. It is a front view which shows the shock absorber (5th Embodiment) which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle body, 15 ... Front bumper beam, 20, 70, 80, 100, 110 ... Shock absorber, 21 ... Shock absorber, 26 ... Core material (guide body), 28 ... Spiral outer peripheral material (moving body), 31, 104, 114 ... Wrapped material, 32 ... Left side part (surface part), 33 ... Right side part (surface part), 35 ... Outer peripheral part outer side part (outside), 45, 95, 105, 115 ... Raised part, 37, 88 ... Outer part Surface inner surface part (inner side), 72... Housing material (guide body), F1.

Claims (5)

In the shock absorber that absorbs the impact when the impact is applied,
A movable body extended so as to be movable in a direction substantially orthogonal to the input direction of the impact;
A guide body that supports the moving body and can be guided in a direction substantially orthogonal to the input direction of the impact;
With
The moving body is provided with a plurality of surface portions substantially perpendicular to the longitudinal direction of the guide body,
A shock absorber, wherein a raised portion is formed on the surface portion.   The shock absorber according to claim 1, wherein the guide body guides the inside of the moving body.   The shock absorber according to claim 1, wherein the guide body guides the outside of the movable body.   The shock absorber according to any one of claims 1 to 3, wherein the movable body is a member formed in a spiral shape.   The shock absorber according to any one of claims 1 to 3, wherein the movable body includes a plurality of flat plate members formed in a substantially flat plate shape.

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