JP2010047209A - Vehicular shock-absorbing member, and vehicular occupant crash protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular shock-absorbing member, and a vehicular occupant crash protector capable of obtaining a sufficient load characteristic for absorbing impact energy during a vehicle collision, installed even in a narrow space such as a vehicle door, and capable of reliably protecting an occupant body from the impact during the collision. <P>SOLUTION: The vehicular shock-absorbing member 10 is constituted of a hollow cylindrical body 11 which extends in the direction of an axis L and has a predetermined length while the cross sectional area of a surface orthogonal to the direction of the axis L is reduced from one end in the direction of the axis L to the other. A plurality of nodes 13 projecting in a ring shape are formed on an outer circumferential surface located between one end to the other end of the cylindrical body 11 at predetermined spaces in the extending direction of the cylindrical body 11. Each cylindrical section 112 present between the nodes 13 adjacent to each other in the extending direction of the cylindrical body 11 forms a shock-absorbing cylindrical part which is buckled and deformed against a compressive load in the direction of an axis L, and the wall thickness of each cylindrical section 112 is reduced from both nodes 13 adjacent to each other to an intermediate section of the cylindrical section 112 in the direction of the axis L. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention absorbs an impact acting on a body such as an occupant's knee, waist, or head when a vehicle such as an automobile collides with a structure, or an impact on a pedestrian when the vehicle collides with a pedestrian. The present invention relates to a vehicle impact absorbing member that absorbs and relaxes the vehicle and a vehicle occupant protection device that uses this to protect an occupant and a pedestrian from an impact during a vehicle collision.

  Air bags, impact energy absorbers, and the like are used as devices for protecting the occupant by partially mitigating the impact force received by the occupant's body in the event of a car crash (see Patent Document 1). Is configured to be installed at a necessary location in a vehicle where a body such as a knee part, a waist part, or a head part of an occupant partially collides.

In addition, since this type of air bag and impact energy absorber are mainly provided inside the vehicle interior parts, the interior parts are partially deformed or destroyed when they operate. However, interior parts are usually made of plastic, and in many cases design, body requirements, costs, etc. are given priority, so cushioning materials such as urethane foam are packed inside the interior parts, and this cushioning material is used in combination with passengers. The impact energy can be absorbed more effectively.
2005-75137

  In the event of an automobile collision, regardless of whether the belt is worn or not, the occupant moves toward the interior parts such as the instrument panel and door by inertia force, and as a result, the interior parts can be driven with considerable force. The body, such as the knee and waist, will collide partially. In this case, the interior part is a plastic molded product, and the space between the interior part and the vehicle body or door body on which the interior part is supported is extremely narrow and limited. In addition to limiting the size and shape of the impact energy absorber, the amount of cushioning material is limited, and the load resistance of these airbags and impact energy absorber is also limited. As a result, there is a problem that the impact energy exceeding the load resistance of these air bags and impact energy absorbers cannot be sufficiently absorbed, and the function as an impact absorbing device cannot be fully exhibited.

  Also, if the load capacity of the air bag and impact energy absorber is increased, the air bag and impact energy absorber itself will increase, and installation in locations with only a small space such as vehicle doors, vehicle roof pads, pillars, etc. There is a problem that becomes impossible.

  The present invention has been made to solve the above-described conventional problems, and can obtain sufficient load characteristics to absorb impact energy at the time of a vehicle collision, and can also be used in a narrow space such as a vehicle door. However, it is an object of the present invention to provide a vehicle impact absorbing member that can be easily installed and that can reliably protect an occupant's body from an impact during a collision, and a vehicle occupant protection device using the same.

  In order to achieve the above object, the present invention absorbs and reduces the impact on the occupant's body when the vehicle collides with a structure, or absorbs and reduces the impact on the pedestrian when the vehicle collides with a pedestrian. A shock absorbing member for a vehicle having a certain length extending in a uniaxial direction and a cross-sectional area of a plane perpendicular to the uniaxial direction decreasing from one end to the other end in the extending direction. The outer peripheral surface having a hollow cylindrical body located between one end and the other end of the cylindrical body has a plurality of node portions protruding in a ring shape along the circumferential direction of the outer peripheral surface. For shock absorption, which is formed at regular intervals in the existing direction and buckles and deforms a plurality of cylindrical portions existing between the adjacent node portions in the extending direction of the cylindrical body with respect to the compressive load in the uniaxial direction. The thickness of each cylindrical portion is the same as that of the cylindrical portion from both adjacent node portions. Characterized in that it is formed to a thickness which decreases as it goes in the middle of the line direction.

  The present invention also relates to an impact absorbing member for a vehicle that absorbs an impact acting on a passenger's body when the vehicle collides with a structure, or absorbs and reduces an impact to a pedestrian when the vehicle collides with a pedestrian. A hollow cylinder extending in a uniaxial direction and having a cross-sectional area that is perpendicular to the uniaxial direction and decreasing from one end to the other end in the extending direction, and having one end of the cylinder The outer peripheral surface and the outer peripheral surface of the other end are each formed with a node protruding in a ring shape along the circumferential direction of the outer peripheral surface, and the cylindrical portion existing between the nodes is formed against the compressive load in the extending direction. A cylindrical portion for shock absorption that is buckled and deformed, and the thickness of the cylindrical portion is formed so as to decrease from the adjacent joints to the intermediate portion in the uniaxial direction of the cylindrical portion. It is characterized by that.

  In addition, the present invention is a vehicle occupant protection device, in which an interior part or exterior part of a vehicle and an interior part or a pedestrian facing the location of the interior part that the occupant is likely to collide at the time of a vehicle collision are likely to collide. A vehicle impact absorbing member according to any one of claims 1 to 5, wherein the vehicle impact absorbing member is disposed at an inner side of the exterior component facing the location of the exterior component.

  In addition, the present invention is a vehicle occupant protection device, in which an interior part or exterior part of a vehicle and an interior part or a pedestrian facing the location of the interior part that the occupant is likely to collide at the time of a vehicle collision are likely to collide. 11. The vehicle impact absorbing member according to claim 6, wherein the vehicle impact absorbing member is disposed at an inner side of the exterior part facing the location of the exterior part.

  According to the vehicle impact absorbing member and the vehicle occupant protection device using the same according to the present invention, it is possible to obtain sufficient load characteristics to absorb the impact energy at the time of the vehicle collision, and the narrowness of the vehicle door or the like. It can be easily installed even in a large space, and the body of the occupant or pedestrian can be reliably protected from the impact at the time of collision.

(Embodiment 1)
Next, an embodiment of a vehicle impact absorbing member according to the present invention will be described with reference to the drawings.

  1 is a perspective view showing an example of a vehicle impact absorbing member according to the present invention, FIG. 2 is a side view seen from the direction of arrow 2 in FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 4 is an explanatory perspective view showing a state in which the vehicle shock absorbing member according to the first embodiment is mounted in the interior part of the vehicle driver's seat, and FIG. 5 is a diagram illustrating the vehicle shock absorbing member according to the first embodiment. FIG. 6 is a characteristic diagram showing the relationship between the load of the vehicle impact absorbing member and the deformation stroke at the time of the vehicle collision.

  The vehicle impact absorbing member 10 shown in the first embodiment absorbs an impact acting on the occupant's body when the vehicle collides with a structure, or an impact on a pedestrian when the vehicle collides with a pedestrian. 1 and 2, as shown in FIGS. 1 and 2, the passenger's inertial force at the time of a vehicle collision causes the passenger to interior parts of the vehicle, such as interior parts that cover the inner surface of the vehicle door, glove box of the passenger seat, It is composed of a hollow cylinder 11 having a length and a thickness required to absorb an impact force when it collides with an undercover or the like by axial buckling deformation.

  As shown in FIG. 3, the cylindrical body 11 has a certain length extending in the direction of the axis L, and the cross-sectional area of the surface perpendicular to the axial line L is from one end to the other end in the extending direction of the cylindrical body 11. It has a hollow frustoconical shape that decreases as it goes to. One end of the cylinder 11 is opened, and the other end is closed by a lid member 12 made of the same material as the cylinder 11.

  Moreover, as shown in FIGS. 1-3, the outer peripheral surface located between the one end of the large diameter side of the cylinder 11 and the other end of the small diameter side is along the circumferential direction of the outer peripheral surface of the cylinder 11. A plurality of joints 13 projecting in a ring shape are integrally formed in the extending direction of the cylindrical body 11 at regular intervals. And each cylinder part 112 which exists between the node parts 13 and 13 mutually adjacent in the extension direction of the cylinder 11 is made into the cylinder part for impact absorption which buckles and deforms with respect to the compressive load of an axis L direction.

  In the vehicle impact absorbing member 10 shown in FIGS. 1 to 3, the three cylindrical portions 112 are connected in the axis L direction, but in FIG. 4, the five cylindrical portions 112 are in the axis L direction. It has a connected structure.

  In order to cause each tube portion 112 to exhibit an impact absorbing function by buckling deformation, the thickness of each tube portion 112 changes along the axis L direction. That is, as shown in FIG. 3, the two node portions 13 adjacent to each other in the extending direction of the cylinder body 11 go to an intermediate portion in the axis L direction of the tube portion 112 located between the both node portions 13 and 13. The thickness is reduced in accordance with the above. Thereby, the wall thickness of the cylinder 11 is comprised so that the outer peripheral surface of the cylinder part 112 may exhibit the shape which curves in an arc along the direction of the axis line L inward.

  Note that the thickness of the cylindrical portion 112 may be formed so that the inner peripheral surface has an arcuate shape curved outward along the axis L, contrary to the case shown in FIG.

  Such a vehicle impact absorbing member 10 is formed of a resin molded product integrally formed of plastic such as elastomer.

  The constituent material of the vehicle impact absorbing member 10 in the present invention is not limited to plastic, and may be formed from a metal material such as an aluminum alloy. Further, it is possible to adopt a configuration in which one end of the cylindrical body 11 is opened and the other end of the cylindrical body 11 is closed so as to be closed in a sealed state by the lid member 12 having a separate structure from the cylindrical portion 112. It is.

  When the vehicle impact absorbing member 10 described above is used as a vehicle occupant protection device that protects the lower limbs including the knees of the occupants in the vehicle driver's seat from impact during a vehicle collision, as shown in FIG. The vehicle impact absorbing member 10 is located inside the under cover 40 provided in front of the vehicle driver's seat, and is disposed at an inner portion of the under cover 40 facing both knee portions 31 of the passengers in the driver's seat.

  That is, when the vehicle impact absorbing member 10 is mounted inside the under cover 40, as shown in FIG. 4, the node portion 13 provided at one end of the cylinder 11 constituting the vehicle impact absorbing member 10 is illustrated. It is fixed to a deck cross member 41 arranged extending in the left-right direction of the instrument panel via a substrate 42 inside an omitted instrument panel. Then, the lid member 12 provided at the other end of the cylinder 11 constituting the vehicle impact absorbing member 10 is brought into contact with the inner surface of the under cover 40. Thereby, the vehicle occupant protection device for protecting the occupant's knee from the impact at the time of the vehicle collision is configured. Reference numeral 43 denotes a steering handle.

  In such a vehicle occupant protection device using the vehicle impact absorbing member 10, a driver's seat occupant is forcibly moved in the direction of an arrow X approaching the under cover 40 due to its own inertia force at the time of a frontal collision of the vehicle. Then, the passenger's knee 31 collides with the under cover 40. The resulting knee load is transmitted to the pair of vehicle impact absorbing members 10 through the under cover 40, and each cylindrical portion 112 of the cylindrical body 11 constituting the vehicle impact absorbing member 10 is underlined from the knee portion 30. It buckles and deforms according to the collision load acting on the cover 40. That is, when the load F1 from the knee portion 31 applied to the under cover 40 exceeds 3000 [N] as shown in FIG. 6, for example, each cylindrical portion 112 of the cylindrical body 11 is seated as shown in FIG. As shown in FIGS. 5B to 5E, buckling deformation is sequentially performed from the small-diameter cylindrical portion 112 toward the large-diameter cylindrical portion 112 from the normal state where it is not bent. Thereby, the collision load applied to the occupant's knee 31 at the time of the vehicle collision is absorbed.

  FIG. 6 shows the characteristics of the vehicle impact absorbing member 10 including the cylindrical body 11 having a structure in which the shock absorbing cylindrical portions 112 that are buckled and deformed as shown in FIG. 5 are connected in five stages. The buckling deformation load of the entire cylinder 11 in the vehicle impact absorbing member 10 has a characteristic shown in FIG. 6 that increases stepwise from the small-diameter cylindrical portion 112 to the large-diameter cylindrical portion 112.

  According to the first embodiment as described above, the cross-sectional area of a surface having a certain length extending in the direction of the axis L and perpendicular to the direction of the axis L goes from one end to the other end in the direction of the axis L. The impact-absorbing member 10 for vehicles is comprised from the hollow cylinder 11 which decreases according to this, and the outer peripheral surface located between one end of this cylindrical body 11 is formed in a ring shape along the circumferential direction of the said outer peripheral surface A plurality of projecting node portions 13 are formed at regular intervals in the extending direction of the cylinder body 11, and each cylinder portion 112 existing between the adjacent node portions 13 in the extending direction of the cylinder body 11 is connected to the axis L The cylindrical portion for shock absorption that buckles and deforms in response to a compressive load in the direction is reduced, and the thickness of each cylindrical portion 112 decreases from the adjacent joints 13 toward the intermediate portion in the axis L direction of the cylindrical portion 112. The thickness is sufficient to absorb the impact energy at the time of vehicle collision. It is possible to obtain a bearing properties easily, also easily installed in a narrow space such as a vehicle door, moreover, it is possible to reliably protect the occupant or a pedestrian's body from impact during a collision.

  Further, according to the vehicle impact absorbing member 10 shown in the first embodiment, the length and thickness of the hollow cylinder 11 having a truncated cone shape and the thickness of the shock absorbing cylinder portion 112 that buckles and deforms. Alternatively, by changing the number of connected cylindrical portions 112 forming the cylindrical body 11, the impact energy to the occupant that can be absorbed by the cylindrical body 11 can be arbitrarily adjusted, and the vehicle impact absorbing member 10 is mounted. Even if the space is narrow, it is possible to provide a vehicle impact absorbing member 10 having a structure and load characteristics suitable for this narrow space and a vehicle occupant protection device using the same, and protect the occupant from the impact at the time of vehicle collision And the impact on passengers can be minimized.

  Further, according to the first embodiment, since the cylinder 11 constituting the vehicle impact absorbing member 10 can be processed with a plastic molded product such as an elastomer, the vehicle occupant protection device including the vehicle impact absorbing member 10 is provided. Cost reduction is possible.

  Further, according to the vehicle impact absorbing member 10 shown in the first embodiment, the cylindrical body 11 protrudes in a ring shape along the circumferential direction of the outer peripheral surface on the outer peripheral surface located between one end and the other end. Since the plurality of node portions 13 are provided at regular intervals along the extending direction of the cylindrical body 11, the cylindrical body 11 is prevented from being deformed in the radial direction, and is caused by buckling deformation of each cylindrical portion 112. A vehicle occupant protection device having a more stable load characteristic that can absorb impact load reliably can be obtained.

Furthermore, according to the first embodiment, as is clear from the characteristic diagram shown in FIG. 6, each cylindrical portion 112 is in a state of being buckled, that is, plastically deformed in order according to the collision load force. By changing the number of connections of the portion 112 in the direction of the axis L, the deformation stroke of the vehicle impact absorbing member 10 that is the amount of movement in the knee collision direction can be adjusted. Accordingly, the vehicle impact absorbing member 10 that does not give an elastic reaction force to the occupant's knee can be provided.
(Embodiment 2)
An embodiment in which the vehicle impact absorbing member 10 shown in Embodiment 1 of the present invention is applied to a vehicle occupant protection device that protects a passenger in a vehicle passenger seat from a collision from the door side will be described with reference to the drawings. To do.

  FIG. 7 is a perspective view of the main part showing an example in which the vehicle impact absorbing member 10 shown in the first embodiment of the present invention is mounted on the passenger door, and FIG. 8 is taken along line 8-8 in FIG. It is sectional drawing.

  7 and 8, reference numeral 70 denotes a passenger door vehicle door. The vehicle door 70 includes a door main body 701 constituting an exterior and an interior part 702 attached to the inside of the door main body 701. The The interior part 702 is provided with a door pocket 703, an ashtray 704, and the like. A vehicle occupant protection device 80 is mounted in a space 705 formed between the door body 701 and the interior part 702.

  The vehicular occupant protection device 80 includes a plurality of, for example, two vehicular impact absorbing members 10, and the large-diameter side end portion of the cylinder 11 constituting the vehicular impact absorbing member 10 is horizontally disposed in the door body 701. The cylindrical member 11 is fixed to the support member 706 disposed extending in the direction at a right angle with a certain interval in the extending direction of the support member 706, and the cylindrical body 11 is directed from the support member 706 toward the interior part 702. A receiving plate 707 extending in the horizontal direction is joined to the end portion of the cylindrical body 11 on the small diameter side, and the receiving plate 707 is in contact with the inner surface of the interior part 702.

  In the occupant protection device 80 for a vehicle door configured as described above, if a vehicle such as an automobile collides with the occupant protection device portion of the vehicle door 70 from the direction of the arrow X1 shown in FIG. The entire cylinder 11 including the door main body 701 and the support member 706 corresponding to is moved in the direction of the arrow X1, and at the same time, the cylinder 11 including the receiving plate 707 penetrates the interior part 702 to the inside of the vehicle door 70. Project to When the passenger in the passenger seat of the vehicle is forcibly moved in a direction in contact with the receiving plate 707 by the inertial force of the passenger accompanying the reaction force at the time of the vehicle collision, a part of the passenger's body, for example, the side of the waist It collides with the receiving plate 707. The occupant collision load generated along with this is transmitted to the cylinder 11 constituting the vehicle impact absorbing member 10 via the receiving plate 707, and the cylinder portion of the cylinder 11 is sequentially buckled and deformed in accordance with the collision load. . This absorbs the collision load applied to the occupant's body when the vehicle collides.

According to the second embodiment, the same effects as those of the first embodiment can be obtained, and the vehicle occupant protection device can be configured using the vehicle impact absorbing member 10 to It is possible to absorb the impact on the occupant at the time of the vehicle collision over a wide range, and to improve the safety at the time of the vehicle collision with respect to the occupant.
(Embodiment 3)
Next, a vehicle impact absorbing member according to Embodiment 3 of the present invention will be described with reference to the drawings.

  9 is a perspective view of a vehicle impact absorbing member according to Embodiment 3 of the present invention, FIG. 10 is a side view of FIG. 9 viewed from the direction of arrow 10, and FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. It is.

  The vehicle impact absorbing member 50 shown in the third embodiment absorbs the impact acting on the occupant's body when the vehicle collides with the structure, or the impact on the pedestrian when the vehicle collides with the pedestrian. 9 and 10, as shown in FIGS. 9 and 10, the inertia force at the time of the vehicle collision causes the passenger to interior parts of the vehicle, for example, interior parts that cover the inner surface of the vehicle door, the glove box of the passenger seat, It is composed of a hollow cylindrical body 51 having a length and a thickness required to absorb an impact force when it collides with an undercover or the like by buckling deformation in a uniaxial direction.

  As shown in FIG. 11, the cylindrical body 51 has a certain length extending in the direction of the axis L, and the cross-sectional area of the surface perpendicular to the axis L is from one end to the other end in the extending direction of the cylindrical body 11. It has a hollow frustoconical shape that decreases as it goes to. One end of the cylinder 51 is opened, and the other end is closed by a lid member 52 made of the same material as the cylinder 51.

  In addition, on the outer peripheral surface at one end and the outer peripheral surface at the other end of the cylindrical body 51, node portions 53 that protrude in a ring shape along the circumferential direction of the outer peripheral surface are formed. Further, the cylindrical portion 511 existing between both joint portions 53 at both ends is a cylindrical portion for shock absorption that buckles and deforms against a compressive load in the direction of the axis L.

  In order to cause the cylindrical portion 512 to exhibit an impact absorbing function due to buckling deformation, the thickness of the cylindrical portion 512 changes along the axis L direction. That is, as shown in FIG. 11, the thickness decreases from both node portions 53 located at both ends of the cylinder body 51 toward the intermediate portion in the axis L direction of the cylinder portion 512 existing between the both node portions 53 and 53. Is formed. Thereby, the wall thickness of the cylinder 51 is comprised so that the outer peripheral surface of the cylinder part 512 may exhibit the shape which curves in an arc shape inward along the direction of the axis line L. As shown in FIG.

  Note that the thickness of the cylindrical portion 512 may be formed so that the inner peripheral surface has an arcuate shape that curves outward along the axis L, contrary to the case shown in FIG.

  Such a vehicle impact absorbing member 50 is formed of a resin molded product integrally formed of a plastic such as an elastomer.

  The constituent material of the vehicle impact absorbing member 50 in the present invention is not limited to plastic, and may be formed from a metal material such as an aluminum alloy.

  The above-described vehicle impact absorbing member 50 is mounted on the roof pad or center pillar of the automobile 62 in the region 61 shown in FIG. 12, thereby protecting the occupant's head or shoulder from the impact at the time of the vehicle collision. It can be used as a vehicle occupant protection device.

  Further, by mounting the vehicle impact absorbing member 10 having the structure shown in FIG. 1 inside the front bumper portion of the automobile 62 in the region 63 shown in FIG. 12, the automobile collided with a pedestrian. It functions as a vehicle occupant protection device that absorbs and mitigates the impact on the pedestrian at the time, and can protect the pedestrian from the impact at the time of the vehicle collision.

  According to the vehicle impact absorbing member 50 and the vehicle occupant protection device using the same shown in the third embodiment, the deformation stroke of the vehicle impact absorbing member 50 is smaller than that in the first embodiment. The same effects as those of the first embodiment can be obtained.

  The vehicle impact absorbing member and the vehicle occupant protection device using the same according to the present invention are applied to the under cover, the vehicle door, the roof pad, the center pillar, and the vehicle bumper portion of the vehicle driver's seat shown in the above embodiment. Not only what to wear, but it can be worn and used at locations where passengers, pedestrians, etc. collide, such as a glove box in the passenger seat.

It is a perspective view which shows an example of the impact-absorbing member for vehicles concerning this invention. It is the side view seen from the direction of the arrow 2 of FIG. It is sectional drawing which follows the 3-3 line of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory perspective view showing a state where a vehicle impact absorbing member according to Embodiment 1 of the present invention is mounted in an interior part of a vehicle driver's seat. It is explanatory drawing which shows the process in which the impact-absorbing member for vehicles in Embodiment 1 of this invention buckles and deform | transforms with respect to the passenger | crew's collision load, and absorbs impact energy. It is a characteristic view which shows the relationship between the load of the impact-absorbing member for vehicles at the time of a vehicle collision, and a deformation | transformation stroke. FIG. 7 is a perspective view of a main part showing an example when the vehicle impact absorbing member shown in the first embodiment of the present invention is mounted on a vehicle door of a passenger seat, showing Embodiment 2 of the present invention. It is sectional drawing which follows the 8-8 line of FIG. It is a perspective view of the shock absorbing member for vehicles concerning Embodiment 3 of this invention. It is the side view which looked at FIG. 9 from the arrow 10 direction. It is sectional drawing which follows the 11-11 line of FIG. It is explanatory drawing which showed the example of mounting | wearing the motor vehicle with the impact-absorbing member for vehicles concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle shock-absorbing member 11 Cylindrical body 112 Cylinder part 12 Lid member 13 Node part 50 Vehicle shock-absorbing member 51 Cylindrical body 512 Cylinder part 52 Lid member 53 Node part 70 Vehicle door 701 Door main body 702 Interior component 706 Support member 707 Receiver Board 80 Occupant protection device for vehicle

Claims (14)

An impact absorbing member for a vehicle that absorbs an impact acting on a passenger's body when the vehicle collides with a structure, or absorbs and reduces an impact on a pedestrian when the vehicle collides with a pedestrian,
A hollow cylinder having a certain length extending in a uniaxial direction and having a cross-sectional area of a plane perpendicular to the uniaxial direction decreasing from one end to the other end in the extending direction;
On the outer peripheral surface located between one end and the other end of the cylindrical body, a plurality of nodes protruding in a ring shape along the circumferential direction of the outer peripheral surface are formed at regular intervals in the longitudinal direction of the cylindrical body,
A plurality of cylindrical portions existing between the nodes adjacent to each other in the extending direction of the cylindrical body are used as shock absorbing cylindrical portions that buckle and deform with respect to the compressive load in the uniaxial direction,
The thickness of each cylindrical portion is formed to a thickness that decreases from the adjacent node portions toward the intermediate portion in the uniaxial direction of the cylindrical portion,
An impact absorbing member for a vehicle characterized by the above.   The shock absorbing member for a vehicle according to claim 1, wherein one end of the cylindrical body is opened and the other end of the cylindrical body is closed.   The thickness of each cylindrical portion is configured such that the outer peripheral surface or inner peripheral surface of the cylindrical portion has a shape that is curved in an arc shape inward or outward along the extending direction. The shock absorbing member for a vehicle according to claim 1.   By changing at least one of the length, thickness, and thickness of the cylindrical portion or the number of connected cylindrical portions forming the cylindrical body, the impact energy that can be absorbed by the cylindrical body can be arbitrarily adjusted. The vehicle impact absorbing member according to any one of claims 1 to 3, wherein the vehicle impact absorbing member is configured.   The impact absorbing member for a vehicle according to any one of claims 1 to 4, wherein the cylindrical body is a plastic molded product such as an elastomer. An impact absorbing member for a vehicle that absorbs an impact acting on a passenger's body when the vehicle collides with a structure, or absorbs and reduces an impact on a pedestrian when the vehicle collides with a pedestrian,
A hollow cylinder that extends in a uniaxial direction and has a cross-sectional area that is perpendicular to the uniaxial direction and decreases from one end to the other end in the extending direction;
On the outer peripheral surface at one end and the outer peripheral surface at the other end of the cylindrical body, there are respectively formed nodes that project in a ring shape along the circumferential direction of the outer peripheral surface,
The cylindrical portion existing between the nodes is a cylindrical portion for impact absorption that buckles and deforms against the compressive load in the extending direction,
The thickness of the cylindrical portion is formed to a thickness that decreases from both adjacent node portions toward the intermediate portion in the uniaxial direction of the cylindrical portion,
An impact absorbing member for a vehicle characterized by the above.   The impact absorbing member for a vehicle according to claim 6, wherein one end of the cylinder is opened and the other end of the cylinder is closed.   The thickness of the cylindrical portion is configured such that an outer peripheral surface or an inner peripheral surface of the cylindrical portion is configured to be curved in an arc shape inward or outward along the extending direction. The impact absorbing member for a vehicle according to claim 6.   7. The structure according to claim 6, wherein impact energy that can be absorbed by the cylindrical body can be arbitrarily adjusted by changing at least one of a length, a thickness, and a thickness of the cylindrical portion. The vehicle impact absorbing member according to any one of 8.   The impact absorbing member for a vehicle according to any one of claims 6 to 9, wherein the cylindrical body is a plastic molded product such as an elastomer. Vehicle interior parts or exterior parts,
2. The vehicle is disposed inside the interior part facing the location of the interior part where a passenger is likely to collide at the time of a vehicle collision or inside the exterior part facing the location of the exterior part where a pedestrian is likely to collide. Or at least the vehicle impact absorbing member according to any one of 5 to 5,
An occupant protection device for a vehicle.   12. The vehicle occupant protection according to claim 11, wherein the vehicle impact absorbing member disposed inside the interior part or inside the exterior part is configured by arranging a plurality of cylinders. apparatus. Vehicle interior parts or exterior parts,
The vehicle is disposed inside the interior part facing the interior part where the occupant is likely to collide when the vehicle collides or inside the exterior part facing the exterior part where the pedestrian is likely to collide. Or at least the vehicle impact absorbing member according to any one of 10 to 10,
An occupant protection device for a vehicle.   The vehicle occupant protection according to claim 13, wherein the vehicle impact absorbing member disposed inside the interior part or inside the exterior part is configured by arranging a plurality of cylinders. apparatus.