JP2009063013A - Energy absorbing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy absorbing member 10 high in the weight efficiency of energy absorption. <P>SOLUTION: The energy absorbing member 10 comprises a cylindrical body 11 having a peripheral wall; and a plurality of line-shaped high deformation resisting portions 12 provided on the peripheral wall in a circumferential direction at even intervals, and having higher deformation resistance than those of other parts constituting the peripheral wall. Each line-shaped high deformation resisting portion 12 extends from one end to the other end in the body so as to meander in a wave shape in a cylinder axial direction. When a compressing load in the cylinder axial direction is inputted into the body 11, parts between the line-shaped high deformation resisting portions 12 are individually deformed into bellows shapes. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an energy absorbing member that absorbs energy by plastic deformation when a compressive load is input.

  For example, Patent Document 1 discloses an energy absorbing member that constitutes a part of a vehicle frame and is used to absorb an impact load at the time of a collision. The energy absorbing member includes a cylindrical main body and a concavo-convex portion formed at an intermediate position in the cylinder axis direction on the outer peripheral surface of the main body. In this energy absorbing member, when a compressive load in the cylinder axis direction is input to the main body, the main body is bent and deformed relatively large in the cylinder axis direction starting from the uneven portion, thereby absorbing energy. I am doing so.

Further, in Patent Document 2, in an energy absorbing member having a main body having a rectangular cross section, a plurality of horizontal grooves are formed at the same position in the cylinder axis direction on two opposing surfaces of the main body, while adjacent to each other. On two mating surfaces, there is disclosed an energy absorbing member formed by shifting a plurality of lateral grooves by a 1/2 pitch in the cylinder axis direction. Thus, in the energy absorbing member of Patent Document 2, when a compressive load in the cylinder axis direction is input to the main body, each lateral groove starts as a bellows shape and the bellows deformation is wide in the cylinder axis direction. It is made uniform over the range.
JP 2005-29064 A JP 2004-148955 A

  By the way, since the energy absorption member of patent document 1 has the comparatively large bending deformation of a main body, parts other than the part to deform | transform, ie, most parts of a main body, are hardly involved in energy absorption. For this reason, there exists a problem that the amount of energy absorption (weight efficiency of energy absorption) with respect to a member weight is comparatively low.

  Due to such low weight efficiency, when the energy absorbing member is used to constitute a part of the vehicle frame, for example, the fuel consumption is deteriorated as the vehicle weight increases.

  On the other hand, for example, the energy absorbing member described in Patent Document 2 is improved in the weight efficiency of energy absorption compared with the energy absorbing member described in Patent Document 1 by making the deformation region wide. However, there is a demand to further improve the weight efficiency of energy absorption.

  This invention is made | formed in view of this point, The place made into the objective is to provide the energy absorption member with high weight efficiency of energy absorption.

  According to one aspect of the present invention, the energy absorbing member is more than a cylindrical main body having a peripheral wall and other portions constituting the peripheral wall provided at a predetermined interval in the circumferential direction with respect to the peripheral wall. A plurality of streak-like high deformation resistance parts having a high deformation resistance, each of the streaky high-deformation resistance parts extending while meandering in a cylindrical axis direction from one end to the other end of the main body, When a compressive load in the cylinder axis direction is input to the main body, each of the portions between the streak-like high deformation resistance portions is individually crushed and deformed into a bellows shape.

  According to this configuration, when a compressive load in the cylinder axis direction is input to the main body, each of the streaky high deformation resistance portions extending in the waveform is compressed, so that the waveform is crushed in the cylinder axis direction. At this time, in the portion between the streak-like high deformation resistance portion and the streak-like high deformation resistance portion, where the corrugated peaks face each other, the two peaks approach each other. It becomes compressed in the relative direction. As a result, convex deformation wrinkles in the radial direction extend in the relative direction between the peaks. On the other hand, the portions where the corrugated valleys face each other are separated from each other, so that they are pulled in the relative direction of the valleys. As a result, convex deformation wrinkles inward in the radial direction extend in the relative direction of the valleys. As a result, the outwardly projecting deformation wrinkles and the inwardly projecting deformation wrinkles are aligned in the cylinder axis direction, so that there is a gap between the adjacent streaky high deformation resistance portions and the streaky high deformation resistance portions. A part will deform | transform into a bellows shape.

  In the energy absorbing member having the above configuration, the main body is divided into a plurality of regions in the circumferential direction by the streaky high deformation resistance portion extending from one end to the other end. The accordion-like deformation that occurs is caused individually in each of the plurality of regions. As a result, a complicated deformation occurs over a wide range of the energy absorbing member starting from the streak-like high deformation resistance portion, thereby improving the weight efficiency of energy absorption.

  The streaky high deformation resistance portions may be configured such that the phase of the waveform is shifted from each other by a half pitch between adjacent streaky high deformation resistance portions.

  In this way, in the portion between the streaky high deformation resistance portion and the streaky high deformation resistance portion described above, the direction in which the peaks face each other is the direction perpendicular to the cylinder axis, and the direction in which the valleys face each other The direction is perpendicular to the cylinder axis. For this reason, deformation wrinkles generated in the main body when a compressive load is input extend in a direction orthogonal to the cylinder axis, so that the main body is more stably crushed and deformed in a bellows shape. As a result, the weight efficiency of energy absorption is further improved.

  The main body has a polygonal cross section in which a peripheral wall includes a plurality of plane portions and a plurality of ridge lines where the plane portions are joined to each other, and each of the ridge lines meanders in a waveform in the cylinder axis direction. The streak-like high deformation resistance portion may be formed thereby.

  By doing so, when a compressive load is input to the main body, a bellows-like deformation occurs individually in each of the plane portions between the adjacent streak-like high deformation resistance portions.

  At least one of the pitch and the height of the waveform of each of the streaky high deformation resistance portions may be changed in the cylindrical axis direction so that the load-displacement characteristic of the main body becomes a predetermined characteristic. .

  For example, the deformation resistance on the input side of the compression load in the main body may be set lower than the deformation resistance on the opposite side.

  By doing this, when the compressive load is input, the compressive load input side portion of the main body is relatively easily crushed and deformed. Therefore, in the load-displacement characteristics of the main body, the initial load peak value (the main body is plastic). It is possible to reduce the load value when starting deformation.

  The pitch of the waveform of each of the streaky high deformation resistance portions may be gradually increased from the compression load input side toward the opposite side.

  Moreover, the height of the waveform of each of the streaky high deformation resistance portions may be gradually reduced from the compression load input side toward the opposite side.

  By doing so, it is possible to set the deformation resistance on the input side of the compression load in the main body to be lower than the deformation resistance on the opposite side.

  Each of the streaky high deformation resistance portions may be formed by bending and deforming the peripheral wall in the circumferential direction so as to be convex or concave from the surface of the peripheral wall. By bending and deforming the peripheral wall in the direction perpendicular to the cylinder axis direction, the deformation resistance of that portion becomes relatively high.

  Each of the streaky high deformation resistance portions may be formed by locally quenching the peripheral wall. By increasing the resistance locally by the quenching process, the deformation resistance of the portion becomes relatively high.

  The main body is arranged so that a cylinder axis direction thereof coincides with a vehicle front-rear direction and constitutes a part of a front frame of the vehicle, and a collision load input to the vehicle It is good also as absorbing by each deform | transforming into a bellows shape each part between.

  As described above, since this energy absorbing member has a high energy absorption weight efficiency, when used as a vehicle frame member, there is an advantage that the vehicle weight is reduced.

  As described above, according to the present invention, when a compressive load in the cylinder axis direction is input to the main body having a plurality of streak-like high deformation resistance parts, the portions between the streaky high-deformation resistance parts adjacent to each other are respectively By individually deforming in a bellows shape from one end to the other end in the cylinder axis direction, complicated deformation occurs over a wide range of the energy absorbing member, and the weight efficiency of energy absorption is greatly improved. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(Embodiment 1)
FIG. 2 shows the energy absorbing member 10 according to the first embodiment of the present invention. As shown in FIG. 1, the energy absorbing member 10 is, for example, in the vehicle front-rear direction at the vehicle width direction on both sides in the vehicle front portion. Are used as a crush can 92 interposed between the front end portion of the front side frame 91 and the front end of the front side frame 91 and the bumper reinforcement.

  The energy absorbing member 10 includes a cylindrical main body 11, and a streak-like high deformation resistance portion 12 having relatively higher deformation resistance than other portions is formed on the peripheral wall of the main body 11. As shown in FIG. 3, the streak-like high deformation resistance portion 12 is formed by bending and deforming the peripheral wall of the main body 11 so as to protrude outward in the radial direction from the surface thereof. Extends from one end to the other end while meandering in a corrugated shape in the cylinder axis direction. As described above, the streak-like high deformation resistance portion 12 extends in the cylinder axis direction and is bent and deformed in a direction orthogonal to the cylinder axis, and therefore exhibits a higher deformation resistance than other portions.

  A plurality of streak-like high deformation resistance portions 12 are formed on the peripheral wall of the main body 11 at equal intervals in the circumferential direction. Here, as shown in FIG. 4, the plurality of streak-like high deformation resistance portions 12 are formed such that the phases of the waveforms are the same. As a result, in the portion between the adjacent streak-like high deformation resistance portions 12, the direction in which the ridges of the waveform face each other is inclined with respect to the cylinder axis as shown by the one-dot chain line in FIG. Similarly, the direction in which the valleys face each other is inclined with respect to the cylinder axis as shown by the two-dot chain line in FIG.

  Here, the interval (a) between the adjacent streaky high deformation resistance portions 12 in the main body 11, the pitch (b) and height (c) of the waveform in each streaky high deformation resistance portion 12, and each streaky high deformation resistance. What is necessary is just to set the depth (d) of the part 12 suitably according to the characteristics (The deformation resistance, energy absorption amount, etc.) requested | required of the energy absorption member 10, respectively. For example, as the interval (a) between the streak-like high deformation resistance portions 12 is smaller, the deformation resistance of the main body 11 is lower, and the waveform pitch (b) of the streak-like high deformation resistance portion 12 is shorter as the pitch is shorter. The deformation resistance of the main body 11 decreases as the height of the corrugated high deformation resistance portion 12 increases, and the depth (d) of the streaky high deformation resistance portion 12 decreases. ), The deformation resistance of the main body 11 decreases as the depth increases.

  The material of the main body 11 can be appropriately selected from various materials used as members constituting a vehicle frame, such as steel and aluminum.

  The energy absorbing member 10 having the above-described configuration can be manufactured by appropriately adopting various known molding methods. As an example, as shown in FIG. 5, the energy absorbing member 10 is formed by bending a cylindrical member 82 serving as the main body 11 using a mandrel 81 to form a streak-like high deformation resistance portion 12. Can be manufactured.

  The mandrel 81 used here has a number of protrusions 83 corresponding to the number of the streaky high deformation resistance portions 12 formed on the main body 11 around the mandrel 81. It is formed with a gap. Then, the mandrel 81 is inserted into the cylindrical member 82 at a predetermined insertion speed while being inverted around the central axis at a predetermined rotation angle. By doing so, the peripheral wall of the cylindrical member 82 is pushed outward in the radial direction by the projections 83 of the mandrel 81, and extends from one end to the other end of the cylindrical member 82 (that is, the main body 11). Thus, a plurality of streak-like high deformation resistance portions 12 that extend while meandering in the waveform in the cylinder axis direction are formed at predetermined intervals in the circumferential direction. At this time, the height of the waveform of each streak high deformation resistance portion 12 is set according to the reversal angle of the mandrel 81, and each streak high deformation resistance portion depends on the reversal period (frequency) of the mandrel 81 and the insertion speed. Twelve waveform pitches are set. Further, the depth of each streaky high deformation resistance portion 12 is set by the height of the projection 83 of the mandrel 81, and the interval between the streaky high deformation resistance portions 12 is set by the number and arrangement of the projections 83 of the mandrel 81. The

  Although not shown in the figure, the plate-like member is subjected to, for example, pressing or rolling, so that a plurality of streaks protruding from the surface thereof are spread over a predetermined range from one end to the other end of the plate-like member. The energy absorbing member 10 can also be manufactured by forming the plate-like member into a corrugated shape and winding the plate-like member into a cylindrical shape and joining the end portions thereof by welding or the like.

  When a compressive load is input to the energy absorbing member 10, the streaky high deformation resistance portion 12 extending in a waveform in the cylinder axis direction is crushed and deformed in the cylinder axis direction. At this time, in the portion between the adjacent streak-like high deformation resistance portions 12, the portions where the ridges of the waveform face each other (refer to the one-dot chain line in FIG. 4) are closer to each other. Will be compressed in the opposite direction. As a result, the portion, that is, the portion indicated by the alternate long and short dash line in FIG. 4, is generated such that the convex deformation wrinkles extend outward in the radial direction in the relative direction of the mountains. On the other hand, since the two valleys are separated from each other where the corrugated valleys face each other (see the two-dot chain line in FIG. 4), the valleys are pulled in the relative direction of the valleys. As a result, the portion, that is, the portion indicated by a two-dot chain line in FIG. 4 is generated such that the convex deformation wrinkles extend inward in the radial direction and extend in the relative direction of the valleys. Thus, the outwardly convex deformation wrinkles and the inwardly convex deformation wrinkles are alternately arranged in the cylinder axis direction, so the portion between the adjacent streaky high deformation resistance portions 12 Will be deformed into a bellows shape.

  Further, as shown in FIG. 6, at the position corresponding to the peak of the waveform of each streak high deformation resistance portion 12, one of the both sides sandwiching the streak high deformation resistance portion 12 (the right side in FIG. 6) has a diameter. Convex deformation wrinkles occur outward in the direction, and the other (left side in FIG. 6) has convex deformation wrinkles inward in the radial direction. Accordingly, there are a plurality of portions between the streaky high deformation resistance portion 12 and the streaky high deformation resistance portion 12, but each portion is individually deformed into a bellows shape (see FIG. 7).

  As a result, the energy absorbing member 10 undergoes complex deformation over a wide range when a compressive load is input, so that the weight efficiency of energy absorption can be improved as compared with the conventional case.

  Each streak-like high deformation resistance portion 12 is not formed by bending the peripheral wall so as to be convex outward in the radial direction, as described above. For example, as shown in FIG. You may form by bending a surrounding wall so that it may become convex toward the inward of a direction. In this case, for example, as shown in FIG. 9, a mandrel having a plurality of protrusions 85 that push the peripheral wall inward in the radial direction by contacting the outer peripheral surface of the cylindrical member 82 is used. It is possible to manufacture an energy absorbing member having a streak-like high deformation resistance portion by moving it relative to the cylindrical member 82 at a predetermined speed while inverting the central axis at a predetermined rotation angle. become.

  Furthermore, each streak-like high deformation resistance portion 12 is constituted by a convex portion protruding radially outward from its outer surface by making it thicker than other portions, for example, as shown in FIG. May be. Even in this configuration, the deformation resistance of the streak-like high deformation resistance portion is relatively high because it is thicker than other portions. Although not shown in the drawings, the streak-like high deformation resistance portion may be formed by projecting such a convex portion radially inward from the inner surface.

  In addition, the streak-like high deformation resistance portion may be configured by locally quenching the main body and improving the resistance of the portion as compared with other portions. That is, although illustration is omitted, for example, a plate-like member is quenched into a predetermined waveform from one end to the other end by laser quenching or the like, and then the plate-like member is cylindrical. The ends are joined to each other by welding or the like. By doing so, it is possible to manufacture a cylindrical energy absorbing member having a streak-like high deformation resistance portion.

(Embodiment 2)
FIG. 11 shows an energy absorbing member 20 according to the second embodiment. The energy absorbing member 20 is different from the energy absorbing member 10 of the first embodiment in the arrangement of the streaky high deformation resistance portion 12.

  That is, as shown in an enlarged view in FIG. 12, in this energy absorbing member 20, the phase of the waveform of the adjacent streaky high deformation resistance portion 12 is shifted from each other by ½ pitch. As a result, the direction in which the ridges of the corrugations face each other between the adjacent streaky high deformation resistance portions 12 becomes a horizontal direction orthogonal to the cylinder axis as shown by a one-dot chain line in FIG. The direction in which the valleys face each other is the horizontal direction as shown by the two-dot chain line in FIG.

  When a compressive load in the cylinder axis direction is input to the energy absorbing member 20, as in the case of the energy absorbing member 10, the portion where the peaks are opposite to each other is between the adjacent streaky high deformation resistance portions 12. Convex deformation wrinkles are generated outward in the direction, and convex deformation wrinkles are generated inward in the radial direction at locations where the valleys face each other. In this energy absorbing member 20, both the outward convex deformation wrinkles and the inward convex deformation wrinkles extend in the horizontal direction, and as shown in FIG. 13, the main body 21 is unevenly deformed in the circumferential direction. However (see the black arrow in FIG. 13), it is stably crushed and deformed in a bellows shape in the cylinder axis direction. As a result, the weight efficiency of energy absorption can be further improved.

  In addition, although illustration is omitted, also in the second embodiment, each streak-like high deformation resistance portion may be formed by bending the peripheral wall so as to be convex inward in the radial direction as described above. However, you may form by a convex part thicker than another site | part. Moreover, you may form each streak high deformation resistance part by performing a hardening process.

(Embodiment 3)
FIG. 14 shows an energy absorbing member 30 according to the third embodiment. In the energy absorbing member 30, the cross section of the main body 31 is formed in a rectangular shape, and each streak-like high deformation resistance portion is formed by each ridge line 32.

  That is, the main body 31 of the energy absorbing member 30 has a cylindrical shape having a rectangular cross section including four plane portions 33 and four ridge lines 32 where adjacent plane portions are joined to each other. As shown in an enlarged view in FIG. 15, it is formed to meander in a waveform in the cylinder axis direction. Such an energy absorbing member 30 presses each of the left and right sides of each ridgeline 32 in a horizontal direction from one side to the other side using a predetermined jig against a rectangular cylindrical member, for example. In addition, since the ridgeline 32 can be bent and deformed into a waveform by changing the pressing direction so as to alternate in the cylinder axis direction, it can be manufactured.

  When a compressive load in the cylinder axis direction is input to the energy absorbing member 30, although not shown in the figure, like the cylindrical energy absorbing member 10, between the adjacent streaky high deformation resistance portions, That is, a bellows-like crushing deformation occurs individually in each of the plane portions 33 between the ridge lines 32. As a result, the weight efficiency of the energy absorbing member 30 can be improved.

  In this configuration as well, the waveform phase may be the same between adjacent ridge lines 32 or may be shifted by 1/2 pitch.

(Embodiment 4)
FIG. 16 shows an example of load-displacement characteristics of the energy absorbing member. The characteristics required when the energy absorbing member is applied to the front side frame 91 of the vehicle as described above are as follows: (1) Peak value of initial load (starting plastic deformation) as shown by the solid line in FIG. (2) The load fluctuation (the fluctuation of the load during the compression deformation of the main body) is small, (3) The target average load, (4) Crushing There are approximately four characteristics of a long stroke. Among these, (1) and (2) are mainly for suppressing large load fluctuations from acting on the vehicle occupant, and (3) and (4) are mainly set according to the specifications of the vehicle. This is related to the design value of the energy absorbing member.

  FIG. 17 shows an energy absorbing member 40 according to the fourth embodiment. The energy absorbing member 40 according to the fourth embodiment is mainly intended to reduce the peak value of the initial load in the load-displacement characteristics shown in FIG.

  That is, in the main body 41 of the energy absorbing member 40, the pitch of the waveform of each streaky high deformation resistance portion (ridge line 42) is relatively small in the compression load input side portion (upper portion in FIG. 17). At the same time, the pitch is set to gradually increase from the upper side to the lower side of the main body 41. As described above, since the deformation resistance of the main body 41 decreases as the waveform pitch of the streaky high deformation resistance portion is shorter, the main body 41 has a portion on the input side of the compressive load on the opposite side portion. In comparison, the deformation resistance is reduced. Therefore, when a compressive load is input to the energy absorbing member 40, the peak value of the initial load is lowered.

(Modification)
FIG. 18 shows a modification of the energy absorbing member of the fourth embodiment. In the energy absorbing member 50, the height of the waveform of each streaky high deformation resistance portion (ridge line 52) is changed in the cylinder axis direction. That is, in the portion of the main body 51 on the input side of the compressive load (the upper portion in FIG. 18), the height of the waveform is set to be relatively high, and the height of the waveform is changed from the upper side of the main body 51 to the lower side. It is set so as to become gradually lower toward. The higher the waveform height of the streak-like high deformation resistance portion, the lower the deformation resistance of the main body 51. Therefore, the main body 51 has a deformation resistance in the portion on the input side of the compressive load compared to the opposite side portion. Will drop. Accordingly, when a compressive load is input to the energy absorbing member 50, the peak value of the initial load is lowered.

  In addition, in Embodiment 4 and its modification, even if the main body of an energy absorption member is cylindrical as shown in FIG. 2 etc., the same effect can be obtained.

  As described above, since the weight efficiency of the energy absorbing member is improved, the present invention is useful as, for example, an energy absorbing member for constituting a part of a vehicle frame, particularly a front or rear frame.

It is a partially broken side view showing a front frame of a vehicle to which an energy absorbing member is applied. It is a perspective view which shows the energy absorption member which concerns on Embodiment 1. FIG. It is a cross-sectional view of the streaky high deformation resistance part in the energy absorbing member. It is expansion explanatory drawing of the surrounding wall of the said energy absorption member. It is explanatory drawing which shows an example of the manufacturing method of the said energy absorption member. It is an expansion perspective view of the vicinity of the streaky high deformation resistance part at the time of a deformation | transformation of the said energy absorption member. It is a perspective view which shows the state which the said energy absorption member deform | transformed. It is a cross-sectional view of the streaky high deformation resistance portion in the energy absorbing member according to the modified example of the first embodiment. It is explanatory drawing which shows an example of the manufacturing method of the said energy absorption member. It is a cross-sectional view of the streaky high deformation resistance portion in the energy absorbing member according to still another modification example of the first embodiment. It is a perspective view which shows the energy absorption member which concerns on Embodiment 2. FIG. It is expansion explanatory drawing of the surrounding wall of the said energy absorption member. It is a perspective view which shows the state which the said energy absorption member deform | transformed. It is a perspective view which shows the energy absorption member which concerns on Embodiment 3. FIG. It is an expansion perspective view of the part of the ridgeline of the energy absorption member. It is an example of the load-displacement characteristic of an energy absorption member. It is a perspective view which shows the energy absorption member which concerns on Embodiment 4. It is a perspective view which shows the energy absorption member which concerns on the modification of Embodiment 4.

Explanation of symbols

10, 20, 30, 40, 50 Energy absorbing members 11, 21, 31, 41, 51 Main body 12 Streaky high deformation resistance portions 32, 42, 52 Ridge line 33 Flat portion 91 Front side frame (front frame)
92 Crash Can (front frame)

Claims (10)

A cylindrical body having a peripheral wall;
A plurality of streak-like high deformation resistance portions provided with a predetermined interval in the circumferential direction with respect to the peripheral wall and having a higher deformation resistance than other parts constituting the peripheral wall,
Each of the streaky high deformation resistance portions extends while meandering in a waveform in the cylinder axis direction from one end to the other end of the main body,
An energy absorbing member in which each portion between the streak-like high deformation resistance portions is individually crushed and deformed into a bellows shape when a compressive load in the cylinder axis direction is input to the main body. The energy absorbing member according to claim 1,
The streaky high deformation resistance portion is an energy absorbing member in which the waveform phase is shifted from each other by a half pitch between adjacent streaky high deformation resistance portions. The energy absorbing member according to claim 1,
The main body has a polygonal cross section in which the peripheral wall includes a plurality of plane portions and a plurality of ridgelines where the plane portions are joined to each other,
Each said ridgeline is meandering in the waveform in the said cylinder axis direction, and is formed thereby, The energy absorption member which comprises the said streaky high deformation resistance part. The energy absorbing member according to claim 1,
An energy absorbing member in which at least one of the pitch of the corrugated high deformation resistance portion and the height thereof is changed in the cylinder axis direction so that the load-displacement characteristic of the main body becomes a predetermined characteristic. The energy absorbing member according to claim 4,
In the main body, the deformation resistance on the input side of the compressive load is set to be lower than the deformation resistance on the opposite side. The energy absorbing member according to claim 5,
The energy absorbing member in which the pitch of the waveform of each of the streaky high deformation resistance portions is gradually increased from the compression load input side toward the opposite side. The energy absorbing member according to claim 5,
The height of the waveform of each said streaky high deformation resistance part is an energy-absorbing member that is gradually reduced from the compression load input side toward the opposite side. The energy absorbing member according to claim 1,
Each of the streaky high deformation resistance portions is an energy absorbing member formed by bending and deforming the peripheral wall in the circumferential direction so as to be convex or concave from the surface of the peripheral wall. The energy absorbing member according to claim 1,
Each of the streaky high deformation resistance portions is an energy absorbing member formed by locally quenching the peripheral wall. The energy absorbing member according to claim 1,
The main body is arranged so that a cylinder axis direction thereof coincides with a vehicle front-rear direction and constitutes a part of a front frame of the vehicle, and a collision load input to the vehicle An energy absorbing member that absorbs each of the portions between them by being individually deformed into a bellows shape.

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