WO2018179321A1 - 自動車の衝撃吸収部材およびサイドメンバー - Google Patents
自動車の衝撃吸収部材およびサイドメンバー Download PDFInfo
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- WO2018179321A1 WO2018179321A1 PCT/JP2017/013566 JP2017013566W WO2018179321A1 WO 2018179321 A1 WO2018179321 A1 WO 2018179321A1 JP 2017013566 W JP2017013566 W JP 2017013566W WO 2018179321 A1 WO2018179321 A1 WO 2018179321A1
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- Prior art keywords
- side end
- collision
- vehicle
- collision side
- absorbing member
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- 230000005484 gravity Effects 0.000 claims abstract description 69
- 230000035939 shock Effects 0.000 claims description 141
- 230000008878 coupling Effects 0.000 claims description 62
- 238000010168 coupling process Methods 0.000 claims description 62
- 238000005859 coupling reaction Methods 0.000 claims description 62
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 238000005452 bending Methods 0.000 description 77
- 230000000052 comparative effect Effects 0.000 description 16
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- 238000013459 approach Methods 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
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- 230000007423 decrease Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000000704 physical effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/157—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body for side impacts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/152—Front or rear frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/08—Front or rear portions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/20—Floors or bottom sub-units
Definitions
- the present invention relates to an impact absorbing member for automobiles such as passenger cars and trucks. Specifically, the present invention relates to an impact absorbing member for absorbing energy at the time of automobile collision.
- the mainstream car body is a monocoque structure.
- the monocoque structure is usually a structure in which a steel plate is press-formed into a part having a flange called a hat part, and then the flange parts are assembled into a box shape by spot welding or the like, and the plurality of box-like parts are joined together. It has become.
- structural members such as side members and side sills as shown in FIG. 1 are required to have a performance of absorbing an impact at the time of a collision, that is, a so-called impact absorbing performance.
- a car side member includes a front side member for absorbing a shock at the time of a front collision and a rear side member for absorbing a shock at the time of a rear collision.
- FIG. 2 perspective view
- FIG. 3 plan view
- the front side member is configured by connecting a front side member front having an impact absorbing member and a front side member rear having a curved portion connected to the cabin side.
- the front side member front has a shock absorbing function for absorbing a shock at the time of a frontal collision
- the front side member rear has a deformation suppressing function that is difficult to be deformed at the time of a collision.
- FIG. 4 there is a rear side member attached to the right side of the vehicle and a rear side member attached to the left side.
- the rear side member is configured by joining a rear side member rear having an impact absorbing member and a rear side member front having a curved portion connected to the cabin side.
- the rear side member front has a deformation suppressing function that hardly deforms at the time of a collision
- the rear side member rear has an impact absorbing function that absorbs an impact at the time of a rear collision.
- the “impact absorbing member” in the present specification refers to a member that is buckled by a compressive force at the time of collision and absorbs (relaxes) shock by performing large plastic deformation (for example, axial crushing deformation or bending deformation). . Since the shock absorbing member is greatly plastically deformed at the time of collision, from the viewpoint of securing the passenger space at the time of the collision, the shock absorbing member is at least one of the vehicle outer side in the vehicle length direction and the vehicle outer side in the vehicle width direction with respect to the passenger boarding location. Be placed. In the case of the front side member illustrated in FIG.
- the straight portion on the front side of the front subframe serving as the attachment portion of the front suspension component, that is, on the vehicle outer side in the vehicle length direction L, is the shock absorbing member.
- the straight portion located behind the rear subframe serving as the mounting portion for the rear suspension component, that is, on the vehicle outer side in the vehicle length direction L is the shock absorbing member. It is.
- the side member has a bent portion
- the straight portion located on the vehicle outer side in the vehicle length direction than the bent portion is the shock absorbing member.
- the shape of the “straight portion” ridge is not limited to a strict straight shape that does not bend in the vehicle length direction L, but includes a substantially straight shape.
- the “impact absorbing member” in this specification does not include a crash box that may be provided at the front end portion of the front side member or the rear end portion of the rear side member.
- Conventional shock absorbing members include those described in Patent Documents 1 to 3.
- Patent Document 1 discloses a technique in which a plurality of beads are arranged with a half-pitch shift on each of an outer panel and an inner panel constituting a front side member of an automobile. By providing such a bead, a bellows-like axial crushing deformation is generated from each of the plurality of beads when an impact load is applied. In Patent Document 1, this improves the impact absorption performance.
- Patent Document 2 discloses a technique for providing stress concentration facilitating means in a portion opposite to the vertical direction of a stress concentration portion, which is a starting point of bending when an impact load is applied, in a chassis offset frame for trucks in order to enhance shock absorption performance. Is disclosed.
- Patent Document 2 by providing such a stress concentration facilitating means, the stress value in the vicinity of the folding start point is made substantially constant, and the Z-shaped folding is suppressed.
- the bellows-like axial crushing deformation is generated between the fold starting points, thereby improving the impact absorbing performance.
- Patent Document 3 includes a front member that extends in the vehicle length direction, a middle member that is bent from the rear end of the front member and extends rearward, and a rear member that extends rearward from the rear end of the middle member.
- a configured side member is disclosed.
- the vehicle structure to which the side member of Patent Document 3 is attached is a so-called cabover in which a part of the floor panel bulges upward, the engine is accommodated in the internal space, and a passenger seat is disposed above the engine. This is a type of vehicle structure.
- the impact absorbing member of the side member described in Patent Document 3 is a front member.
- the shape of the shock absorbing member is built according to the shape of the vehicle body, but the impact absorbing member such as the side member that extends in the vehicle length direction does not collide with the position of the collision side end as viewed from the vehicle length direction. Some have different side end positions.
- the “collision side end portion” refers to an end portion that is relatively positioned on the vehicle outer side in the vehicle length direction among both end portions of the impact absorbing member extending in the vehicle length direction.
- the “non-collision side end portion” refers to an end portion that is relatively located inside the vehicle in the vehicle length direction.
- the “collision side end” when the impact absorbing member is used as the front side member is an end on the front side in the vehicle length direction.
- the “collision side end” when the shock absorbing member is used as the rear side member is an end on the rear side in the vehicle length direction.
- the “position of the collision side end” in this specification refers to the position of the center of gravity (centroid) of the collision side end as viewed from the vehicle length direction L.
- the position of the non-collision side end refers to the position of the center of gravity (centroid) of the non-collision side end as viewed from the vehicle length direction L.
- FIG. 7 is a plan view showing an impact absorbing member of a front side member (left side) having a shape as shown in FIG.
- the collision side end E is offset from the non-collision side end E ′ by the displacement W 0 to the vehicle outer side in the vehicle width direction W.
- the impact absorbing member 51 includes a hat channel-shaped outer member 52 and an inner member 53.
- the outer member 52 and the inner member 53 have the same cross-sectional shape from the collision side end E to the non-collision side end E ′, and the length in the vehicle width direction W in each cross section.
- the length in the vertical direction V is also equal.
- the bending moment M is higher at the non-collision side end E ′ than at the collision side end E. That is, a high compressive stress is generated in the vehicle outer side portion in the vehicle width direction W of the non-collision side end portion E ′ of the shock absorbing member 51 to induce bending deformation.
- a tensile stress in the vehicle length direction L is generated in the vehicle inner side portion of the shock absorbing member 51 in the vehicle width direction W, so that the vehicle inner side in the vehicle width direction W is less likely to buckle. That is, the impact absorbing member 51 as shown in FIG. 7 is easily deformed when an impact load is input, and stable axial crushing deformation hardly occurs, so that the impact absorbing performance cannot be sufficiently improved.
- Patent Document 1 is intended for an impact absorbing member in which the collision side end and the non-collision side end have the same position in the vehicle width direction. For this reason, when the technique of Patent Document 1 is applied to the shock absorbing member having a shape as shown in FIG. 7, bending mode deformation occurs at the non-collision side end at the initial stage of the collision from the front, and the shock absorbing member There is a possibility that the impact absorbing performance that is aimed at cannot be obtained.
- Patent Document 2 can be applied to an impact absorbing member in which the positions of the collision side end and the non-collision side end are different from each other when viewed from the vehicle length direction.
- the technique of Patent Document 2 is a technique for generating a bellows-like axial crushing deformation between the folding start points, it is limited to the case where there are a plurality of folding starting points when the effect of improving the impact absorbing performance is obtained.
- the front member which is a shock absorbing member of Patent Document 3
- a shock absorbing member having a shape as shown in FIG. 7 when the impact load is input, the portion of the front member outside the vehicle in the vehicle width direction is used. High compressive stress is generated and bending deformation is induced.
- a tensile stress in the vehicle length direction is generated in the vehicle inner side portion of the front member in the vehicle width direction, so that the vehicle inner side in the vehicle width direction is less likely to buckle. For this reason, the impact absorbing performance cannot be sufficiently improved.
- the present invention has been made in view of such problems of the prior art, and (a) has a shape extending in the vehicle length direction and is non-collision with the collision side end portion as viewed from the vehicle length direction.
- the shock absorbing member having different side end positions (for example, the position in the vehicle width direction and the position in the vertical direction), (b) suppressing deformation in the bending mode at the non-collision side end, and (c) the collision side end It is an object to stably generate a bellows-shaped axial crushing mode deformation in a portion.
- the present invention that solves the above-mentioned problems is an impact that extends in the vehicle length direction of an automobile and is offset so that both end portions in the vehicle length direction are different from each other when viewed from the vehicle length direction.
- An absorbent member comprising a hat-shaped outer member and an inner member coupled to each other at a flange portion, and the inner member from the center of gravity of a cut surface perpendicular to the vehicle length direction of the outer member and the inner member and the offset direction of the length G in the to the top of, when the ratio of the length G out of the offset direction from the center of gravity of ⁇ section to the top of the outer member (G in / G out) is defined as the center of gravity ratio
- the position seen from the vehicle length direction of the both ends is frontward from the end side offset to the vehicle outer side toward the end side offset to the vehicle inner side. Is characterized in that the center of gravity ratio increases.
- Another aspect of the present invention is an impact absorbing member that extends in the vehicle length direction of an automobile and is offset so that both end portions in the vehicle length direction are different from each other when viewed from the vehicle length direction.
- the ratio of in to the hat height H out of the outer member H in / H out
- the hat height ratio increases from the end side toward the end side offset to the vehicle inner side.
- a side member of an automobile comprising: a member having the above-described shock absorbing member; and a deformation suppressing member having a curved portion connected to the cabin side. It is said.
- the shock absorbing performance of the shock absorbing member can be improved.
- FIG. 8 is a cross-sectional view taken along the line AA in FIG.
- FIG. 8 is a sectional view taken along line BB in FIG.
- FIG. 13 is a sectional view taken along line BB in FIG.
- CC sectional drawing in FIG. It is a figure which shows the stress distribution figure at the time of the impact load input in the impact-absorbing member (front left side) which concerns on the 1st Embodiment of this invention.
- FIG. 18 is a cross-sectional view taken along the line BB in FIG. It is CC sectional drawing in FIG. It is a figure which shows the stress distribution figure at the time of the impact load input in the impact-absorbing member (front left side) which concerns on the 2nd Embodiment of this invention. It is a top view which shows schematic shape of the front side member which concerns on the 3rd Embodiment of this invention. It is a top view which shows schematic shape of the impact-absorbing member (front left side) which concerns on the 3rd Embodiment of this invention.
- FIG. 24 is a sectional view taken along line BB in FIG.
- CC sectional drawing in FIG. It is a figure which shows the stress distribution figure at the time of the impact load input in the impact-absorbing member (front left side) which concerns on the 3rd Embodiment of this invention.
- FIG. 29 is a sectional view taken along line BB in FIG. 28.
- FIG. 34 is a sectional view taken along line BB in FIG.
- CC sectional drawing in FIG. It is a figure which shows the stress distribution map at the time of the impact load input in the impact-absorbing member (rear left side) which concerns on the 5th Embodiment of this invention.
- FIG. 34 is a sectional view taken along line BB in FIG.
- FIG. 34 is a figure which shows the stress distribution map at the time of the impact load input in the impact-absorbing member (rear left side) which concerns on the 5th Embodiment of this invention.
- It is a top view which shows the verification model of the Example of this invention in impact load input simulation.
- the impact absorbing member exemplified in the first embodiment is an impact absorbing member of a front side member (left side) having a shape as shown in FIG.
- the impact absorbing member 1 in the first embodiment has a shape in which the collision side end E is offset from the non-collision side end E ′ by the displacement W 0 in the vehicle width direction W. It has become.
- the front left side shock absorbing member 1 is illustrated.
- the front right side shock absorbing member 1 for example, the front left side shock absorbing member 1 is reversed left and right when viewed from the vehicle length direction L. The one with the shape is applied.
- the impact absorbing member 1 includes an outer member 2 and an inner member 3. As shown in FIGS. 13 to 15, both the outer member 2 and the inner member 3 have a so-called hat shape that is perpendicular to the vehicle length direction L and project in the vertical direction V. Flange portions 2a and 3a are formed. The outer member 2 and the inner member 3 are joined with the surfaces of the flange portions 2a and 3a being combined. Thereby, the shock absorbing member 1 has a closed cross-sectional shape when viewed from the vehicle length direction L. Also, as shown in FIG. 12, the outer member 2 and the inner member 3 have the outer member 2 and the inner member 3 when viewed from the direction in which the flange portions 2a and 3a protrude (vertical direction V in the first embodiment).
- the coupling surface J is formed in a straight line.
- the coupling surface of the outer member 2 and the inner member 3 may be simply referred to as “coupling surface J”.
- spot welding is normally used as a method for joining the flange portion 2a of the outer member 2 and the flange portion 3a of the inner member 3
- other joining methods such as laser welding, arc welding, and seam welding may be used.
- the vehicle width direction length W out (also referred to as a hat height H out) from the top 2b of the outer member 2 to the coupling surface J. ) Is longer than the vehicle width direction length W in (also referred to as hat height H in ) from the top 3b of the inner member 3 to the coupling surface J.
- the vehicle width direction length W out from the top 2b of the outer member 2 to the coupling surface J becomes shorter from the collision side end E toward the non-collision side end E ′. Yes.
- the vehicle width direction length W in from the top portion 3b to the coupling surface J of the inner member 3 is longer as the collision-side end portion E closer to the non-collision-side end E '.
- the vehicle width direction length W out ′ from the top 2 b of the outer member 2 to the coupling surface J is from the top 3 b of the inner member 3 to the coupling surface J. It is shorter than the vehicle width direction length W in '.
- top portion of the outer member refers to a direction (for example, the first embodiment) perpendicular to the flange protruding direction (for example, the vertical direction V in the first embodiment) of the outer member 2 when viewed from the vehicle length direction L. Then, it refers to a portion farthest from the flange portion 2a in the vehicle width direction W).
- top portion of the inner member refers to a portion of the inner member 3 that is farthest from the flange portion 3a in the direction perpendicular to the flange protruding direction when viewed from the vehicle length direction L.
- the ratio of the hat height H in of the inner member 3 and the hat height H out of the outer member 2 (hereinafter referred to as the hat height ratio H in / H out ) is non-collision from the collision side end E. It gradually increases toward the side end E ′.
- the increase rate of the hat height ratio H in / H out in the direction from the collision side end E toward the non-collision side end E ′ can be arbitrarily set.
- the sum of the hat heights H in and H out is made constant, and the increase rate of the hat height ratio H in / H out is made constant.
- the shape of the flange (joint surface J) viewed from the direction in which the flange protrudes is a straight line
- the impact absorbing member 1 can be formed by the outer member 2 and the inner member 3 having a simple shape.
- the increase rate of the hat height ratio H in / H out is hat height ratio H in / H out of A at a collision-side end portion E, hat high ratio of non-collision-side end E 'H in / H out (B ⁇ A) / L1 where B is the length of the shock absorbing member 1 in the vehicle length direction L and L1.
- the increase rate of the hat height ratio (H in / H out ) is preferably 0.033 or more. Thereby, the shock absorbing performance of the shock absorbing member 1 can be improved.
- the center of gravity G at the non-collision side end E ′ of the cut surface perpendicular to the vehicle length direction L is greater than the vehicle width with respect to the center of gravity G 0 at the collision side end E.
- the vehicle moves toward the vehicle outer side in the vehicle width direction W.
- the position of the center of gravity G of the shock absorbing member 1 moves from the position of the center of gravity G 0 of the collision side end E to the vehicle as it approaches the non-collision side end E ′ from the collision side end E.
- the vehicle moves outward in the width direction W. Note that in FIG. 14 and FIG. 15 shows the position of the center of gravity G 0 in collision-side end portion E shown in FIG. 13 by a dotted line.
- the shock absorbing member 1 of the first embodiment is such that the position of the center of gravity moves to the vehicle outer side in the vehicle width direction W from the collision side end E to the non-collision side end E ′. It has a shape. Accordingly, when it is assumed that the bending moment M is constant in the vehicle length direction L, the shock absorbing member 1 generated at the collision side end E by the bending moment M as shown in the stress distribution diagram shown in FIG.
- the tensile stress inside the vehicle in the vehicle width direction W is smaller than the tensile stress generated at the non-collision side end E ′. That is, the position of the center of gravity of the cut surface perpendicular to the vehicle length direction L does not change from the collision side end E to the non-collision side end E ′ as shown in FIGS. 8 to 10, and the stress distribution as shown in FIG.
- the tensile stress inside the vehicle in the vehicle width direction W of the shock absorbing member 1 at the collision side end E becomes smaller. As a result, the situation in which the vehicle inner side in the vehicle width direction W at the collision side end E is less likely to buckle is improved, and axial crushing deformation is easily induced.
- the compressive stress on the vehicle outer side in the vehicle width direction W of the impact absorbing member 1 generated at the non-collision side end E ′ due to the bending moment M is smaller than the compressive stress generated at the collision side end E.
- the vehicle outer side in the vehicle width direction W of the shock absorbing member 1 at the non-collision side end E ′ is compressed more than the vehicle outer side in the vehicle width direction W of the conventional shock absorbing member 51 at the non-collision side end E ′.
- the one-dot chain line in FIG. 16 is a neutral axis N connecting the centers of gravity of the cut surfaces perpendicular to the vehicle length direction L from the collision side end E to the non-collision side end E ′.
- the shock absorption is configured such that the position of the center of gravity in the cut surface perpendicular to the vehicle length direction L moves from the collision side end E to the non-collision side end E ′ to the vehicle outer side in the vehicle width direction W. If it is the member 1, while being able to generate stably the axial crushing deformation
- the tensile stress inside the vehicle in the vehicle width direction W of the shock absorbing member 1 at the collision side end E and the compressive stress outside the vehicle in the vehicle width direction W of the shock absorbing member 1 at the non-collision side end E ′ By reducing the difference, it is possible to stably generate the axial crushing deformation of the collision side end portion E and to suppress the bending deformation of the non-collision side end portion E ′.
- the direction length Wout and the vehicle width direction length Wout ′ from the top 2b of the outer member 2 to the coupling surface J at the non-collision side end E ′ satisfy Wout ⁇ Wout ′ ⁇ 2.8. Is preferred.
- the tensile stress in the vehicle length direction L on the vehicle inner side in the vehicle width direction W of the collision side end E and the compressive stress in the vehicle length direction L on the vehicle outer side in the vehicle width direction W of the non-collision side end E ′. Can be made sufficiently small, and the impact absorption performance can be improved compared to the case where W out ⁇ W out ′ ⁇ 2.8.
- a more preferable relationship between W out and W out ′ is W out ⁇ W out ′ ⁇ 3.
- W out ′ preferably satisfies W out ′ ⁇ 8 mm.
- W out ′ preferably satisfies W out ′ ⁇ 8 mm.
- the impact absorbing member 1 satisfies W out ⁇ W out ′ ⁇ 3 and satisfies W out ′ ⁇ 10 mm, the impact absorbing performance can be further improved.
- the length L1 of the impact absorbing member 1 in the vehicle length direction L is in the range of 300 mm ⁇ L1 ⁇ 650 mm, and the collision side end E and the non-collision side end It is preferable that the ratio of the offset amount W 0 and L 1 in the vehicle width direction W of the part E ′ satisfies 0.017 ⁇ W 0 / L 1 ⁇ 0.087. In the range of L1 ⁇ 300 mm or W 0 /L1 ⁇ 0.017, the effect of suppressing the moment of bending the non-collision side end E ′ is small, and the effect of suppressing the bending deformation of the non-collision side end E ′ is small.
- a more preferable numerical range of the length L1 of the shock absorbing member 1 in the vehicle length direction L is 400 mm ⁇ L1 ⁇ 600 mm. Furthermore, more preferable range of the ratio of the offset amount W 0 and L1 in the vehicle width direction W of the collision-side end E the non-collision-side end E 'is 0.035 ⁇ W 0 /L1 ⁇ 0.070.
- the shock absorbing member of the second embodiment is also a front side member (left side) shock absorbing member as in the first embodiment. Further, the impact absorbing member 1 of the second embodiment as shown in FIGS. 17 to 20, the collision-side end E with respect to the non-collision-side end E ', the displacement in the vehicle outer side in the vehicle width direction W W 0 This is the same as the first embodiment in that it is offset by only.
- the shape of the shock absorbing member 1 is different from that of the first embodiment. More specifically, in the first embodiment shown in FIGS. 12 to 15, the inner member 3 has a hat shape in which the flange portion 3a is formed on the rectangular cross-section member. In the second embodiment, The inner member 3 has a hat shape in which the flange portion 3a is formed on the polygonal cross-sectional member.
- the shock absorbing member 1 of the second embodiment is similar to the first embodiment, as the vehicle of the outer member 2 approaches the non-collision side end E ′ from the collision side end E.
- the length in the width direction is shortened, and the length in the vehicle width direction of the inner member 3 is increased.
- the center of gravity at the non-collision side end E ′ is the flange in the shock absorbing member 1 in the vehicle width direction W with respect to the center of gravity at the collision side end E.
- the vehicle moves to the vehicle outer side in the vehicle width direction W.
- the position of the center of gravity G of the impact absorbing member 1 is moved closer to the non-collision side end E ′ from the collision side end E, and the center of gravity G 0 of the collision side end E is reached. From the position to the vehicle outer side in the vehicle width direction W.
- FIG. 19 and FIG. 20 shows the position of the center of gravity G 0 in collision-side end portion E shown in FIG. 18 by a dotted line.
- the bending moment M is constant with respect to the vehicle length direction L.
- the tensile stress inside the vehicle in the vehicle width direction W generated at the collision side end E by the bending moment M is smaller than the tensile stress generated at the non-collision side end E ′.
- the compressive stress on the vehicle outer side in the vehicle width direction W generated at the non-collision side end E ′ due to the bending moment M becomes smaller than the compressive stress generated at the collision side end E.
- the shock absorbing member 1 of the second embodiment can stably prevent the crushing deformation of the collision-side end E while suppressing the bending deformation of the non-collision-side end E ′. Can be generated. Thereby, it is possible to improve the shock absorbing performance.
- 21 is a neutral axis N that connects the centers of gravity of the cut surfaces perpendicular to the vehicle length direction L from the collision side end E to the non-collision side end E ′.
- the shock absorption is configured such that the position of the center of gravity in the cut surface perpendicular to the vehicle length direction L moves from the collision side end E to the non-collision side end E ′ to the vehicle outer side in the vehicle width direction W. If it is the member 1, while being able to generate stably the axial crushing deformation
- the tensile stress inside the vehicle in the vehicle width direction W of the shock absorbing member 1 at the collision side end E and the compressive stress outside the vehicle in the vehicle width direction W of the shock absorbing member 1 at the non-collision side end E ′ By reducing the difference, it is possible to stably generate the axial crushing deformation of the collision side end portion E and to suppress the bending deformation of the non-collision side end portion E ′.
- the shock absorbing member exemplified in the third embodiment is a front side member (left side) shock absorbing member having a shape as shown in FIG.
- the impact absorbing member 1 in the third embodiment has a shape in which the collision side end E is offset from the non-collision side end E ′ by the displacement W 0 in the vehicle width direction W. It has become.
- 23 exemplifies the front left side shock absorbing member 1, but the front right side shock absorbing member 1 is reversed left and right when viewed from the vehicle length direction L, for example. The one with the shape is applied.
- the impact absorbing member 1 includes an outer member 2 and an inner member 3. As shown in FIGS. 24 to 26, both the outer member 2 and the inner member 3 have a so-called hat shape in the shape of the cut surface perpendicular to the vehicle length direction L as in the first embodiment. And flanges 2a and 3a projecting in the vertical direction V are formed. The outer member 2 and the inner member 3 are joined with the surfaces of the flange portions 2a and 3a being combined. As shown in FIG. 23, the outer member 2 and the inner member 3 have a joint surface J that is straight when viewed from the direction in which the flange portions 2a and 3a protrude (vertical direction V in the second embodiment). It is formed as follows.
- the vehicle width direction length W out from the top 2b of the outer member 2 to the coupling surface J in the cross section viewed from the vehicle length direction L of the collision side end E. (also referred to as hat height H out) is shorter than the vehicle width direction length W in from the top portion 3b of the inner member 3 to the coupling surface J (also called hat height H in).
- the length in the vehicle width direction from the top 2b of the outer member 2 to the coupling surface J becomes longer from the collision side end E to the non-collision side end E ′.
- the length in the vehicle width direction from the top 3b of the inner member 3 to the coupling surface J becomes shorter as it approaches the non-collision side end E ′ from the collision side end E.
- the vehicle width direction length W out ′ from the top 2b of the outer member 2 to the coupling surface J is from the top 3b of the inner member 3 to the coupling surface J. It is longer than the vehicle width direction length W in '.
- the bending moment M generated in the impact absorbing member 1 at the time of a frontal collision is a reverse moment to the bending moment M generated in the impact absorbing member 1 of the first embodiment shown in FIG.
- the impact-absorbing member 1 of 3rd Embodiment is bent in the vehicle inner side of the vehicle width direction W.
- the center of gravity at the non-collision side end E ′ is the position of the flanges 2a and 3a in the shock absorbing member 1 in the vehicle width direction W with respect to the center of gravity at the collision side end E.
- the vehicle moves in the vehicle width direction W. Therefore, as shown in FIGS. 24 to 26, the center of gravity G of the impact absorbing member 1 is located closer to the non-collision side end E ′ from the collision side end E as the center of gravity G 0 of the collision side end E is increased. From the position to the vehicle inner side in the vehicle width direction W. Note that in FIG. 25 and FIG. 26 shows the position of the center of gravity G 0 in collision-side end portion E shown in FIG. 24 by a dotted line.
- the bending moment M is constant with respect to the vehicle length direction L.
- the tensile stress generated on the vehicle outer side in the vehicle width direction W at the collision side end E by the bending moment M is smaller than the tensile stress generated at the non-collision side end E ′.
- the compressive stress generated on the vehicle inner side in the vehicle width direction W at the non-collision side end E ′ by the bending moment M becomes smaller than the compressive stress generated at the collision side end E.
- the position of the center of gravity of the cut surface perpendicular to the vehicle length direction L does not change from the collision side end E to the non-collision side end E ′ as shown in FIGS. 8 to 10, and the stress distribution as shown in FIG.
- the conventional shock absorbing member it is possible to suppress the induction of bending deformation at the non-collision side end E ′, and the vehicle outer side in the vehicle width direction W at the collision side end E is less likely to buckle.
- the situation can also improve. That is, when the collision side end E is located on the vehicle inner side in the offset direction (vehicle width direction W in the third embodiment) with respect to the non-collision side end E ′, the shock absorbing member as in the third embodiment.
- a one-dot chain line in FIG. 27 is a neutral axis N that connects the centers of gravity of the cut surfaces perpendicular to the vehicle length direction L from the collision side end E to the non-collision side end E ′.
- the third implementation is performed.
- the position of the center of gravity of the cut surface perpendicular to the vehicle length direction L moves to the vehicle inner side in the vehicle width direction W from the collision side end E to the non-collision side end E ′. If it is the member 1, while being able to generate stably the axial crushing deformation
- the tensile stress on the vehicle outer side in the vehicle width direction W of the shock absorbing member 1 at the collision side end E and the compressive stress on the vehicle inner side in the vehicle width direction W of the shock absorbing member 1 at the non-collision side end E ′ By reducing the difference, it is possible to stably generate the axial crushing deformation of the collision side end portion E and to suppress the bending deformation of the non-collision side end portion E ′.
- the coupling surface extends from the top 3b of the inner member 3 at the collision side end E.
- the vehicle width direction length W in to J and the vehicle width direction length W in ′ from the top 3b of the inner member 3 to the coupling surface J at the non-collision side end E ′ are W in ⁇ W in ′ ⁇ 2. .8 is preferably satisfied.
- W in and W in 'more preferred relationship is, W in ⁇ W in' is a ⁇ 3.
- W in ' is, W in' it is preferable to satisfy a ⁇ 8mm.
- strength of the inner member 3 can be enlarged.
- W in can be suppressed bending deformation of ' ⁇ non-collision-side end portion E than in the case of 8 mm', the shock absorbing performance can be improved.
- W in ' more preferably in the range of, W in' is ⁇ 10mm.
- W in ⁇ W in 'meets ⁇ 3 and, W in' ⁇ 10mm can be further improved impact absorbing performance if the impact absorbing member 1 satisfying.
- the length L1 of the impact absorbing member 1 in the vehicle length direction L is in the range of 300 mm ⁇ L1 ⁇ 650 mm, and the collision side end E and the non-collision side end It is preferable that the ratio of the offset amount W 0 and L 1 in the vehicle width direction W of the part E ′ satisfies 0.017 ⁇ W 0 / L 1 ⁇ 0.087. In the range of L1 ⁇ 300 mm or W 0 /L1 ⁇ 0.017, the effect of suppressing the moment of bending the non-collision side end E ′ is small, and the effect of suppressing the bending deformation of the non-collision side end E ′ is small.
- a more preferable numerical range of the length L1 of the shock absorbing member 1 in the vehicle length direction L is 400 mm ⁇ L1 ⁇ 600 mm. Furthermore, more preferable range of the ratio of the offset amount W 0 and L1 in the vehicle width direction W of the collision-side end E the non-collision-side end E 'is 0.035 ⁇ W 0 /L1 ⁇ 0.070.
- the shock absorbing member of the front side member is taken as an example to describe the embodiment of the present invention.
- the shock absorbing member of the rear side member is taken as an example.
- the embodiment will be described.
- the shock absorbing member exemplified in the fourth embodiment is a rear side member (left side) shock absorbing member having a shape as shown in FIG.
- the impact absorbing member 1 in the fourth embodiment has a shape in which the collision side end E is offset from the non-collision side end E ′ by the displacement V 0 toward the vehicle inner side in the vertical direction V. ing.
- the rear left side shock absorbing member 1 is illustrated, but the rear right side shock absorbing member 1 has, for example, a left-right inverted shape when viewed from the vehicle length direction L. Things apply.
- the impact absorbing member 1 includes an outer member 2 and an inner member 3. As shown in FIGS. 29 to 31, both the outer member 2 and the inner member 3 have a so-called hat shape in the shape of a cut surface perpendicular to the vehicle length direction L. Projecting flange portions 2a and 3a are formed. The outer member 2 and the inner member 3 are joined with the surfaces of the flange portions 2a and 3a being combined. Thereby, the shock absorbing member 1 has a closed cross-sectional shape when viewed from the vehicle length direction L. Further, as shown in FIG. 28, the outer member 2 and the inner member 3 have a joint surface J that is straight when viewed from the direction in which the flange portions 2a and 3a protrude (vehicle width direction W in the fourth embodiment). It is formed to become.
- the vertical length V out from the top 2b of the outer member 2 to the coupling surface J (also referred to as a hat height H out ). However, it is shorter than the vertical length V in (also referred to as hat height H in ) from the top 3b of the inner member 3 to the coupling surface J. As shown in FIG. 29 to FIG. 31, the vertical length from the top 2b of the outer member 2 to the coupling surface J becomes longer from the collision side end E to the non-collision side end E ′.
- the length in the vertical direction from the top 3b of the inner member 3 to the coupling surface J becomes shorter as it approaches the non-collision side end E ′ from the collision side end E.
- the vertical length V out ′ from the top 2b of the outer member 2 to the coupling surface J is from the top 3b of the inner member 3 to the coupling surface J. Is longer than the vertical length V in ′.
- the center of gravity at the non-collision side end E ′ is the position of the flange portions 2a and 3a in the shock absorbing member 1 in the vertical direction V with respect to the center of gravity at the collision side end E.
- the vehicle moves to the vehicle interior side in the vertical direction V.
- the position of the center of gravity G of the impact absorbing member 1 is moved closer to the non-collision side end E ′ from the collision side end E as the center of gravity G 0 of the collision side end E. It moves to the vehicle inner side of the vertical direction V from the position.
- FIG. 30 and FIG. 31 shows the position of the center of gravity G 0 in collision-side end portion E shown in FIG. 29 by a dotted line.
- the shock absorbing member 1 of the fourth embodiment is such that the position of the center of gravity moves toward the vehicle inner side in the vertical direction V from the collision side end E to the non-collision side end E ′. It has a shape. Accordingly, when it is assumed that the bending moment M is constant in the vehicle length direction L, the shock absorbing member 1 generated at the collision side end E by the bending moment M as shown in the stress distribution diagram shown in FIG.
- the tensile stress on the vehicle outer side in the vertical direction V becomes smaller than the tensile stress generated at the non-collision side end E ′.
- the compressive stress on the vehicle interior side in the vertical direction V generated by the bending moment M at the non-collision side end E ′ is smaller than the compression stress generated at the collision side end E.
- the position of the center of gravity of the cut surface perpendicular to the vehicle length direction L does not change from the collision side end E to the non-collision side end E ′ as shown in FIGS. 8 to 10, and the stress distribution as shown in FIG.
- the axial crushing deformation of the collision side end E can be stably generated while suppressing the bending deformation of the non-collision side end E ′. Thereby, it is possible to improve the shock absorbing performance.
- 32 is a neutral axis N connecting the centers of gravity of the cut surfaces perpendicular to the vehicle length direction L, from the collision side end E to the non-collision side end E ′.
- the shock absorbing member 1 is configured such that the position of the center of gravity on the cut surface perpendicular to the vehicle length direction L moves from the collision side end E to the non-collision side end E ′ to the vehicle inner side in the vertical direction V. Then, the axial crushing deformation of the collision side end E can be stably generated, and the bending deformation of the non-collision side end E ′ can be suppressed.
- the difference between the tensile stress outside the vehicle in the vertical direction V of the shock absorbing member 1 at the collision side end E and the compressive stress inside the vehicle in the vertical direction V of the shock absorbing member 1 at the non-collision side end E ′ By making it small, the axial crushing deformation of the collision side end E can be generated stably, and the bending deformation of the non-collision side end E ′ can be suppressed.
- the joint surface J extends from the top 3b of the inner member 3 at the collision side end E.
- the vertical length V in up, 'vertical length V in from the top portion 3b of the inner member 3 in the up coupling surface J' non-collision-side end portion E is a V in ⁇ V in ' ⁇ 2.8 It is preferable to satisfy.
- V in ′ preferably satisfies V in ′ ⁇ 8 mm.
- strength of the inner member 3 can be enlarged.
- V in 'more preferably in the range of, V in' is ⁇ 10mm.
- the impact absorbing member 1 satisfies V in ⁇ V in ′ ⁇ 3 and satisfies V in ′ ⁇ 10 mm, the impact absorbing performance can be further improved.
- the length L1 of the impact absorbing member 1 in the vehicle length direction L is in the range of 300 mm ⁇ L1 ⁇ 650 mm, and the collision side end E and the non-collision side end It is preferable that the ratio of the offset amount V 0 and L 1 in the vertical direction V of the portion E ′ satisfies 0.017 ⁇ V 0 / L 1 ⁇ 0.087. In the range of L1 ⁇ 300 mm or V 0 /L1 ⁇ 0.017, the effect of suppressing the moment for bending the non-collision side end E ′ is small, and the effect of suppressing the bending deformation of the non-collision side end E ′ is small.
- a more preferable numerical range of the length L1 of the shock absorbing member 1 in the vehicle length direction L is 400 mm ⁇ L1 ⁇ 600 mm. Furthermore, more preferable range of the ratio of the offset amount V 0 and L1 in the vertical direction V of the collision-side end E the non-collision-side end E 'is 0.035 ⁇ V 0 /L1 ⁇ 0.070.
- the shock absorbing member of the fifth embodiment is a shock absorbing member of the rear side member (left side) as in the fourth embodiment.
- the positional relationship between the collision side end portion E and the non-collision side end portion E ′ is opposite to that of the shock absorbing member of the fourth embodiment. That is, the shock absorbing member of the fifth embodiment has a shape in which the collision side end E is offset from the non-collision side end E ′ by the displacement V 0 in the vertical direction V as shown in FIG. It has become.
- the impact absorbing member 1 includes an outer member 2 and an inner member 3. As shown in FIGS. 34 to 36, both the outer member 2 and the inner member 3 have a so-called hat shape in the shape of the cut surface perpendicular to the vehicle length direction L as in the fourth embodiment. And flanges 2a and 3a projecting in the vehicle width direction W are formed. The outer member 2 and the inner member 3 are joined with the surfaces of the flange portions 2a and 3a being combined. As shown in FIG. 33, the outer member 2 and the inner member 3 have a joint surface J that is straight when viewed from the direction in which the flange portions 2a and 3a protrude (vehicle width direction W in the fifth embodiment). It is formed to become.
- the vertical length V out (hat) from the top 2b of the outer member 2 to the coupling surface J in the cross section viewed from the vehicle length direction L of the collision side end E. also referred to as a high H out) is longer than the vertical length V in from the top portion 3b of the inner member 3 to the coupling surface J (also called hat height H in).
- the vertical length from the top 2b of the outer member 2 to the coupling surface J becomes shorter as it approaches the non-collision side end E ′ from the collision side end E.
- the vertical length V out ′ from the top 2b of the outer member 2 to the coupling surface J is from the top 3b of the inner member 3 to the coupling surface J. Is shorter than the vertical length V in ′.
- the bending moment M generated in the shock absorbing member 1 at the time of a rear collision is a reverse moment to the bending moment M generated in the shock absorbing member 1 of the fourth embodiment shown in FIG.
- the impact-absorbing member 1 of 5th Embodiment is bent to the vehicle outer side of the perpendicular direction V.
- the center of gravity at the non-collision side end E ′ has a flange portion 2a in the shock absorbing member 1 in the vertical direction V with respect to the center of gravity at the collision side end E.
- the vehicle moves to the vehicle outer side in the vertical direction V. Therefore, as shown also in FIGS. 34 to 36, the position of the center of gravity G of the shock absorbing member 1 moves from the collision side end E toward the non-collision side end E ′ as the gravity center G 0 of the collision side end E increases. It moves to the vehicle outer side of the vertical direction V from the position.
- FIGS. 35 and 36 show the position of the center of gravity G 0 in collision-side end portion E shown in FIG. 34 by a dotted line.
- the bending moment M is constant with respect to the vehicle length direction L.
- the tensile stress on the vehicle interior side in the vertical direction V generated at the collision side end E by the bending moment M is smaller than the tensile stress generated at the non-collision side end E ′.
- the compressive stress on the vehicle exterior side in the vertical direction V generated at the non-collision side end portion E ′ by the bending moment M becomes smaller than the compressive stress generated at the collision side end portion E side.
- a one-dot chain line in FIG. 37 is a neutral axis N connecting the centers of gravity of the cut surfaces perpendicular to the vehicle length direction L from the collision side end E to the non-collision side end E ′.
- the position of the center of gravity of the cut surface perpendicular to the vehicle length direction L does not change from the collision side end E to the non-collision side end E ′ as shown in FIGS. 8 to 10, and the stress distribution as shown in FIG.
- the shock absorbing member as in the fifth embodiment. If it is 1, the axial crushing deformation
- the shock absorbing member 1 is configured such that the position of the center of gravity in the cut surface perpendicular to the vehicle length direction L moves from the collision side end E to the non-collision side end E ′ to the vehicle outer side in the vertical direction V. Then, the axial crushing deformation of the collision side end E can be stably generated, and the bending deformation of the non-collision side end E ′ can be suppressed.
- the difference between the tensile stress on the vehicle inner side in the vertical direction V of the shock absorbing member 1 at the collision side end E and the compressive stress on the vehicle outer side in the vertical direction V of the shock absorbing member 1 at the non-collision side end E ′ By making it small, the axial crushing deformation of the collision side end E can be generated stably, and the bending deformation of the non-collision side end E ′ can be suppressed.
- the length in the vertical direction from the top 2b of the outer member 2 to the coupling surface J at the collision side end E when the collision side end E is located outside the vehicle in the vertical direction V with respect to the non-collision side end E ′. and V out is, 'vertical length V out from the top 2b of the outer member 2 at up coupling face J' non-collision-side end E preferably satisfies V out ⁇ V out ' ⁇ 2.8. Accordingly, the difference between the tensile stress in the vehicle length direction L on the vehicle inner side in the vertical direction V of the collision side end E and the compressive stress in the vehicle length direction L on the vehicle outer side in the vertical direction V of the non-collision side end E ′. Can be made sufficiently small, and the shock absorbing performance can be improved as compared with the case where V out ⁇ V out ′ ⁇ 2.8. A more preferable relationship between V out and V out ′ is V out ⁇ V out ′ ⁇ 3.
- V out ′ preferably satisfies V out ′ ⁇ 8 mm.
- V out ′ preferably satisfies V out ′ ⁇ 8 mm.
- the impact absorbing member 1 satisfies V out ⁇ V out ′ ⁇ 3 and satisfies V out ′ ⁇ 10 mm, the impact absorbing performance can be further improved.
- the length L1 of the impact absorbing member 1 in the vehicle length direction L is in the range of 300 mm ⁇ L1 ⁇ 650 mm, and the collision side end E and the non-collision side end It is preferable that the ratio of the offset amount V 0 and L 1 in the vertical direction V of the portion E ′ satisfies 0.017 ⁇ V 0 / L 1 ⁇ 0.087. In the range of L1 ⁇ 300 mm or V 0 /L1 ⁇ 0.017, the effect of suppressing the moment for bending the non-collision side end E ′ is small, and the effect of suppressing the bending deformation of the non-collision side end E ′ is small.
- a more preferable numerical range of the length L1 of the shock absorbing member 1 in the vehicle length direction L is 400 mm ⁇ L1 ⁇ 600 mm. Furthermore, more preferable range of the ratio of the offset amount V 0 and L1 in the vertical direction V of the collision-side end E the non-collision-side end E 'is 0.035 ⁇ V 0 /L1 ⁇ 0.070.
- shock absorbing member in the first to fifth embodiments is as described above, but the shape of the shock absorbing member is not limited to that described in the first to fifth embodiments.
- the flange portion 2a of the outer member 2 and the flange portion 3a of the inner member 3 are formed so as to protrude outside the closed cross section of the shock absorbing member 1, but the flange portion 2a and 3a may be formed so as to protrude inside the closed section.
- the outer member 2 and the inner member 3 may be formed so that at least a part of the coupling surface J viewed from the flange protruding direction is curved. That is, in the first to fifth embodiments, the case where the increase rate of the hat height ratio (H in + H out ) is constant is illustrated, but the shapes of the flange portions 2a and 3a viewed from the flange protruding direction are linear.
- the increase rate of the hat height ratio (H in + H out ) should be 0.033 or more on average.
- the size in the vehicle width direction W and the size in the vertical direction V of the collision side end E and the non-collision side end E ′ may be different from each other.
- the top portion 2b of the outer member 2 and the top portion 3b of the inner member 3 have a planar shape, but may have a curved surface portion. .
- the collision side end E and the non-collision side end E ′ can be improved depending on the offset state. It is important that the position of the center of gravity moves in an appropriate direction from the end E to the non-collision side end E ′.
- the length G in the offset direction from the center of gravity G of the cut surface to the top 3b of the inner member 3 is defined as the “center of gravity ratio”.
- the collision side end portion E is located on the “vehicle outside” in the offset direction with respect to the non-collision side end portion E ′, and as shown in FIGS.
- the center-of-gravity ratio (G in / G out ) increases from the non-collision side end E ′.
- the collision-side end E is located on the “vehicle outside” in the offset direction with respect to the non-collision-side end E ′, and as shown in FIGS.
- the center-of-gravity ratio (G in / G out ) increases from the non-collision side end E ′.
- the collision side end E is positioned “inward of the vehicle” in the offset direction with respect to the non-collision side end E ′, and as shown in FIGS.
- the center-of-gravity ratio (G in / G out ) decreases toward the non-collision side end E ′.
- the collision side end E is positioned “inward of the vehicle” in the offset direction with respect to the non-collision side end E ′, and as shown in FIGS. 29 to 31, the collision side end E
- the center-of-gravity ratio (G in / G out ) decreases toward the non-collision side end E ′.
- the collision-side end E is located on the “vehicle outside” in the offset direction with respect to the non-collision-side end E ′, and as shown in FIGS. 34 to 36, the collision-side end E
- the center-of-gravity ratio (G in / G out ) increases from the non-collision side end E ′.
- the shock absorbing member 1 is configured such that the center-of-gravity ratio (G in / G out ) increases from E toward the non-collision side end E ′.
- the center-of-gravity ratio is increased from the collision side end E toward the non-collision side end E ′.
- the shock absorbing member 1 may be configured so that (G in / G out ) becomes smaller.
- the shock absorbing performance of the shock absorbing member 1 that extends in the vehicle length direction L of the automobile and is offset so that both end portions in the vehicle length direction L are different from each other when viewed from the vehicle length direction L.
- the offset direction length G in from the center of gravity of the cut surface perpendicular to the vehicle length direction L to the top portion 3b of the inner member 3, and the cutting surface When the ratio (G in / G out ) with the length G out in the offset direction from the center of gravity to the top 2b of the outer member 2 is defined as the center of gravity ratio, of the both ends in the vehicle length direction L, the vehicle length direction
- the center-of-gravity ratio only needs to increase from the end portion side offset from the vehicle outer side toward the end side offset from the vehicle inner side.
- a hat height H in the inner member 3 described above assuming that the ratio of the hat height H out of the outer member 3 (H in / H out) is defined as hat high ratio, the non-collision collision-side end portion E
- the hat height ratio (H in / H out ) is the collision side end as shown in FIGS. The vehicle moves outward from the part E toward the non-collision side end E ′.
- the collision-side end E is located on the “vehicle outside” in the offset direction with respect to the non-collision-side end E ′, and the hat height ratio (H in / H out ) moves from the collision side end E toward the non-collision side end E ′ toward the outside of the vehicle.
- the collision-side end E is positioned “inward of the vehicle” in the offset direction with respect to the non-collision-side end E ′, and the hat height ratio (H in / H out ) moves from the collision side end E toward the non-collision side end E ′ toward the vehicle interior side.
- the collision-side end E is positioned “inward of the vehicle” in the offset direction with respect to the non-collision-side end E ′, and the hat height ratio (H in / H out ) moves from the collision side end E toward the non-collision side end E ′ toward the vehicle interior side.
- the collision side end portion E is positioned on the “outside of the vehicle” in the offset direction with respect to the non-collision side end portion E ′, and the hat height ratio (H in / H out ) moves from the collision side end E toward the non-collision side end E ′ toward the outside of the vehicle.
- the shock absorbing performance of the shock absorbing member 1 that extends in the vehicle length direction L of the automobile and is offset so that both end portions in the vehicle length direction L are different from each other when viewed from the vehicle length direction L.
- the ratio between the hat height H in of the inner member 3 and the hat height H out of the outer member 2 on the cut surfaces perpendicular to the vehicle length direction L of the outer member 2 and the inner member 3 ( When H in / H out ) is defined as the hat height ratio, the position viewed from the vehicle length direction L of both end portions in the vehicle length direction L is offset from the end side to the vehicle interior side. It is sufficient that the hat height ratio increases toward the end side.
- FIGS. 38 and 39 As an example for verifying the effect of the present invention, a model of an impact absorbing member according to the present invention as shown in FIGS. 38 and 39 is created, and an impact load is applied to the collision side end of the impact absorbing member. Carried out.
- the collision side end E is located on the vehicle outer side in the vehicle width direction W with respect to the non-collision side end E ′.
- the length W out of the vehicle width direction W from the top 2b of the outer member 2 to the coupling surface J at the collision side end portion E is 31 mm, bonded surface J at the top portion 2b of the outer member 2 at the non-collision-side end E '
- the length W out ′ in the vehicle width direction W is 10 mm. That is, W out / W out ′ is 3.1.
- Offset amount W of the vehicle width direction W 0 is 42.0 mm
- the vehicle length direction length L1 of the impact absorbing member is 600 mm. That is, W 0 / L1 is 0.070.
- W in / W out 0.65 in the embodiment
- W in '/ W out' a 4.12, W in an ascending direction from the collision-side end E to the non-collision-side end E '
- the increase rate of / W out ((4.12-0.65) / 600) is 0.058.
- the center of gravity ratio in the collision-side end portion E (G in / G out) is 0.93
- the center of gravity ratio of the non-collision-side end E '(G in / G out ) is 1.19.
- the increase rate of the centroid ratio (G in / G out ) is 0.0004.
- the angle formed by the top 2b of the outer member 2 and the vehicle length direction L in plan view is 86 degrees
- the angle formed by the coupling surface J and the vehicle length direction L in plan view is 88 degrees.
- FIGS. 40 and 41 a model of a conventional impact absorbing member as shown in FIGS. 40 and 41 was created, and a simulation was performed in which an impact load was applied to the collision side end of the impact absorbing member.
- the collision side end E is located on the vehicle outer side in the vehicle width direction W with respect to the non-collision side end E ′, as in the example.
- the length W out in the vehicle width direction W from the top 52b of the outer member 52 to the coupling surface J at the collision side end E is 10 mm, and the coupling surface J from the top 52b of the outer member 52 at the non-collision side end E ′.
- the length W out ′ in the vehicle width direction W is 10 mm. That is, W out / W out ′ is 1.0.
- the length L1 of the impact absorbing member in the vehicle length direction is 600 mm.
- both the increase rate of W in / W out and the increase rate of the centroid ratio (G in / G out ) are zero.
- the angle formed between the top 52b of the outer member 52 and the vehicle length direction L in plan view is 86 degrees, and the angle formed between the coupling surface J and the vehicle length direction L in plan view is similarly 86 degrees.
- the physical property values are set on the assumption that the outer member and the inner member are high-tensile materials having a plate thickness of 1.2 mm with a thickness of 590 MPa for both the impact absorbing member of the example and the impact absorbing member of the comparative example.
- the analysis conditions are as shown in FIG. 42, and a simulation was performed assuming a frontal collision (also referred to as a rigid wall collision). Specifically, the rigid wall applied to the collision side end E from the front in the vehicle length direction L is moved at a constant speed of about 28 km / h, and the non-collision side end E ′ is brought into a completely restrained state. .
- the model shown in FIG. 42 is a model of a comparative example, but a simulation using the model of the example is also performed under the same analysis conditions.
- FIG. 43 shows the deformation state of the shock absorbing member in the example after the simulation.
- FIG. 44 shows the deformation state of the shock absorbing member in the comparative example after the simulation.
- FIG. 43 in the shock absorbing member of the example, it can be seen that bending deformation does not occur at the non-collision side end portion and that the collision side end portion undergoes bellows-like axial crushing deformation.
- FIG. 44 in the impact absorbing member of the comparative example, it can be seen that bending deformation occurs and bends in the vicinity of the non-collision side end. From the above, it can be seen that the shock absorbing member according to the present invention has the effect of suppressing the bending deformation of the non-collision side end and stably generating the bellows-like axial crushing deformation at the collision side end.
- FIG. 45 the relationship between the displacement of the rigid wall and the input load in this simulation is shown in FIG.
- the “load ratio” on the vertical axis in FIG. 45 is normalized by dividing the input load values of the example and the comparative example by the maximum input load value of the comparative example.
- FIG. 45 it can be seen that the load is stably input to the shock absorbing member of the embodiment, and the axial crushing deformation is continuously generated with the displacement of the rigid wall.
- the impact absorbing member of the comparative example is deformed in the middle, and the input load thereafter is small.
- FIG. 46 shows the relationship between the displacement of the rigid wall and the energy absorption amount, with the integral value of the input load with respect to the displacement amount of the rigid wall as the energy absorption amount of the shock absorbing member.
- the “absorbed energy ratio” on the vertical axis in FIG. 46 is normalized by dividing the energy absorption amounts of the example and the comparative example by the energy absorption amount of the comparative example when the displacement of the rigid wall is 150 mm. It is a thing. According to FIG. 46, it can be seen that the energy absorption amount of the shock absorbing member of the example is higher than that of the shock absorbing member of the comparative example.
- the shock absorbing member according to the present invention has the effect of suppressing the bending deformation at the non-collision side end portion and stably generating the bellows-like axial crushing deformation at the collision side end portion. It turns out that it improves.
- the impact absorbing member of the present invention can be incorporated into an automobile impact absorbing structure.
- a side member including a member having an impact absorbing member and a deformation suppressing member having a curved portion connected to the cabin side can be configured.
- the “member having an impact absorbing member” is, for example, the front side member front as shown in FIG. 2, and the “deformation suppressing member having a curved portion connected to the cabin side” is, for example, FIG. Front side member rear as shown in FIG.
- the “member having an impact absorbing member” is a rear side member rear as shown in FIG.
- FIG. 4 is a rear side member front.
- the impact absorbing member of the present invention can be provided at the end of the side sill in the vehicle length direction as shown in FIG.
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Abstract
Description
第1の実施形態で例示する衝撃吸収部材は、図3のような形状を有するフロントサイドメンバー(レフト側)の衝撃吸収部材である。図12に示すように第1の実施形態における衝撃吸収部材1は、衝突側端部Eが非衝突側端部E’に対し、車両幅方向Wの車外側に変位W0だけオフセットした形状となっている。なお、図12ではフロントレフト側の衝撃吸収部材1を例示しているが、フロントライト側の衝撃吸収部材としては、例えばフロントレフト側の衝撃吸収部材1を車両長さ方向Lから見て左右反転した形状のものが適用される。
第2の実施形態の衝撃吸収部材も第1の実施形態と同様にフロントサイドメンバー(レフト側)の衝撃吸収部材である。また、図17~図20に示すように第2の実施形態の衝撃吸収部材1は、衝突側端部Eが非衝突側端部E’に対し、車両幅方向Wの車外側に変位W0だけオフセットしているという点で第1の実施形態と同様である。一方、第2の実施形態では、衝撃吸収部材1の形状が第1の実施形態のものとは異なっている。具体的に説明すると、図12~図15に示す第1の実施形態ではインナー部材3が矩形断面部材にフランジ部3aが形成されるようなハット形状であったところ、第2の実施形態では、インナー部材3が多角形断面部材にフランジ部3aが形成されるようなハット形状となっている。
第3の実施形態で例示する衝撃吸収部材は、図22のような形状を有するフロントサイドメンバー(レフト側)の衝撃吸収部材である。図23に示すように第3の実施形態における衝撃吸収部材1は、衝突側端部Eが非衝突側端部E’に対し、車両幅方向Wの車内側に変位W0だけオフセットした形状となっている。なお、図23ではフロントレフト側の衝撃吸収部材1を例示しているが、フロントライト側の衝撃吸収部材としては、例えばフロントレフト側の衝撃吸収部材1を車両長さ方向Lから見て左右反転した形状のものが適用される。
第1~第3の実施形態ではフロントサイドメンバーの衝撃吸収部材を例に挙げて本発明の実施形態について説明したが、第4の実施形態ではリアサイドメンバーの衝撃吸収部材を例に挙げて本発明の実施形態について説明する。第4の実施形態で例示する衝撃吸収部材は、図4のような形状を有するリアサイドメンバー(レフト側)の衝撃吸収部材である。図28に示すように第4の実施形態における衝撃吸収部材1は、衝突側端部Eが非衝突側端部E’に対し、鉛直方向Vの車内側に変位V0だけオフセットした形状となっている。なお、図28ではリアレフト側の衝撃吸収部材1を例示しているが、リアライト側の衝撃吸収部材としては例えばリアレフト側の衝撃吸収部材1を車両長さ方向Lから見て左右反転した形状のものが適用される。
第5の実施形態の衝撃吸収部材も第4の実施形態と同様にリアサイドメンバー(レフト側)の衝撃吸収部材である。ただし、第5の実施形態の衝撃吸収部材は、衝突側端部Eと非衝突側端部E’との位置関係が第4の実施形態の衝撃吸収部材と逆になっている。即ち、第5の実施形態の衝撃吸収部材は、図33に示すように衝突側端部Eが非衝突側端部E’に対し、鉛直方向Vの車外側に変位V0だけオフセットした形状となっている。
2 アウター部材
2a アウター部材のフランジ部
2b アウター部材の頂部
3 インナー部材
3a インナー部材のフランジ部
3b インナー部材の頂部
51 従来の衝撃吸収部材
52 従来のアウター部材
52a 従来のアウター部材のフランジ部
53 従来のインナー部材
53a 従来のインナー部材のフランジ部
E 衝撃吸収部材の衝突側端部
E’ 衝撃吸収部材の非衝突側端部
G 重心
G0 衝突側端部の重心
Gin 重心からインナー部材頂部までの長さ
Gout 重心からアウター部材頂部までの長さ
Hin インナー部材のハット高さ
Hout アウター部材のハット高さ
J アウター部材とインナー部材の結合面
L 車両長さ方向
L1 衝撃吸収部材の車両長さ方向の長さ
N 中立軸
V 鉛直方向
V0 鉛直方向における非衝突側端部に対する衝突側端部のオフセット量
Vin 衝突側端部におけるインナー部材の頂部から結合面までの鉛直方向長さ
Vin’ 非衝突側端部におけるインナー部材の頂部から結合面までの鉛直方向長さ
Vout 衝突側端部におけるアウター部材の頂部から結合面までの鉛直方向長さ
Vout’ 非衝突側端部におけるアウター部材の頂部から結合面までの鉛直方向長さ
W 車両幅方向
W0 車両幅方向における非衝突側端部に対する衝突側端部のオフセット量
Win 衝突側端部におけるインナー部材の頂部から結合面までの車両幅方向長さ
Win’ 非衝突側端部におけるインナー部材の頂部から結合面までの車両幅方向長さ
Wout 衝突側端部におけるアウター部材の頂部から結合面までの車両幅方向長さ
Wout’ 非衝突側端部におけるアウター部材の頂部から結合面までの車両幅方向長さ
Claims (11)
- 自動車の車両長さ方向に延び、前記車両長さ方向における両端部が、前記車両長さ方向から見た場合に互いに異なる位置となるようにオフセットした衝撃吸収部材であって、
フランジ部で互いに結合されたハット形状の、アウター部材およびインナー部材を備え、
前記アウター部材および前記インナー部材の、前記車両長さ方向に対する垂直な切断面の重心から前記インナー部材の頂部までのオフセット方向の長さGinと、該切断面の重心から前記アウター部材の頂部までのオフセット方向の長さGoutとの比(Gin/Gout)を重心比と定義したとき、
前記両端部のうち、前記車両長さ方向から見た位置が車外側にオフセットした端部側から、車内側にオフセットした端部側に向かって前記重心比が大きくなる、自動車の衝撃吸収部材。 - 自動車の車両長さ方向に延び、前記車両長さ方向における両端部が、前記車両長さ方向から見た場合に互いに異なる位置となるようにオフセットした衝撃吸収部材であって、
フランジ部で互いに結合されたハット形状の、アウター部材およびインナー部材を備え、
前記アウター部材および前記インナー部材の、前記車両長さ方向に対する垂直な切断面において、前記インナー部材のハット高Hinと、前記アウター部材のハット高Houtとの比(Hin/Hout)をハット高比と定義したとき、
前記両端部のうち、前記車両長さ方向から見た位置が車外側にオフセットした端部側から、車内側にオフセットした端部側に向かって前記ハット高比が大きくなる、自動車の衝撃吸収部材。 - フランジ突出方向が鉛直方向であり、前記オフセットの方向が車両幅方向である、請求項1又は2に記載された自動車の衝撃吸収部材。
- 前記両端部は、衝突側端部と非衝突側端部からなり、
前記衝突側端部における前記アウター部材の頂部から前記アウター部材と前記インナー部材との結合面までの車両幅方向長さをWout、前記非衝突側端部における前記アウター部材の頂部から前記結合面までの車両幅方向長さをWout’、前記衝突側端部における前記インナー部材の頂部から前記結合面までの車両幅方向長さをWin、前記非衝突側端部における前記インナー部材の頂部から前記結合面までの車両幅方向長さをWin’としたとき、
前記衝突側端部が前記非衝突側端部に対し前記車両幅方向の車外側に位置する場合には、Wout≧Wout’×2.8を満足し、
前記衝突側端部が前記非衝突側端部に対し前記車両幅方向の車内側に位置する場合には、Win≧Win’×2.8を満足する、請求項3に記載された自動車の衝撃吸収部材。 - 前記両端部は、衝突側端部と非衝突側端部からなり、
前記非衝突側端部における前記アウター部材の頂部から前記アウター部材と前記インナー部材との結合面までの車両幅方向長さをWout’、前記非衝突側端部における前記インナー部材の頂部から前記結合面までの車両幅方向長さをWin’としたとき、
前記衝突側端部が前記非衝突側端部に対し前記車両幅方向の車外側に位置する場合には、Wout’≧8mmを満足し、
前記衝突側端部が前記非衝突側端部に対し前記車両幅方向の車内側に位置する場合には、Win’≧8mmを満足する、請求項3又は4に記載された自動車の衝撃吸収部材。 - フランジ突出方向が車両幅方向であり、前記オフセットの方向が鉛直方向である、請求項1又は2に記載された自動車の衝撃吸収部材。
- 前記両端部は、衝突側端部と非衝突側端部からなり、
前記衝突側端部における前記アウター部材の頂部から前記アウター部材と前記インナー部材との結合面までの鉛直方向長さをVout、前記非衝突側端部における前記アウター部材の頂部から前記結合面までの鉛直方向長さをVout’、前記衝突側端部における前記インナー部材の頂部から前記結合面までの鉛直方向長さをVin、前記非衝突側端部における前記インナー部材の頂部から前記結合面までの鉛直方向長さをVin’としたとき、
前記衝突側端部が前記非衝突側端部に対し前記鉛直方向の車外側に位置する場合には、Vout≧Vout’×2.8を満足し、
前記衝突側端部が前記非衝突側端部に対し前記鉛直方向の車内側に位置する場合には、Vin≧Vin’×2.8を満足する、請求項6に記載された自動車の衝撃吸収部材。 - 前記両端部は、衝突側端部と非衝突側端部からなり、
前記非衝突側端部における前記アウター部材の頂部から前記アウター部材と前記インナー部材との結合面までの鉛直方向長さをVout’、前記非衝突側端部における前記インナー部材の頂部から前記結合面までの鉛直方向長さをVin’としたとき、
前記衝突側端部が前記非衝突側端部に対し前記鉛直方向の車外側に位置する場合には、Vout’≧8mmを満足し、
前記衝突側端部が前記非衝突側端部に対し前記鉛直方向の車内側に位置する場合には、Vin’≧8mmを満足する、請求項6又は7に記載された自動車の衝撃吸収部材。 - 請求項1~8のいずれか一項に記載された衝撃吸収部材を有する部材と、キャビン側に接続される、湾曲部を有する変形抑制部材とを備えた、自動車のサイドメンバー。
- フロントサイドメンバーとして用いられる、請求項9に記載された自動車のサイドメンバー。
- リアサイドメンバーとして用いられる、請求項9に記載された自動車のサイドメンバー。
Priority Applications (10)
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CA3056192A CA3056192A1 (en) | 2017-03-31 | 2017-03-31 | Impact-absorbing member and side member of automobile |
RU2019130392A RU2019130392A (ru) | 2017-03-31 | 2017-03-31 | Поглощающий удар элемент автомобиля и боковой элемент автомобиля |
PCT/JP2017/013566 WO2018179321A1 (ja) | 2017-03-31 | 2017-03-31 | 自動車の衝撃吸収部材およびサイドメンバー |
JP2017529109A JP6183579B1 (ja) | 2017-03-31 | 2017-03-31 | 自動車の衝撃吸収部材およびサイドメンバー |
BR112019016801A BR112019016801A2 (pt) | 2017-03-31 | 2017-03-31 | elemento de absorção de impacto e elemento lateral de automóvel |
CN201780088844.8A CN110475706B (zh) | 2017-03-31 | 2017-03-31 | 汽车的冲击吸收构件和纵梁 |
EP17903256.0A EP3604086B1 (en) | 2017-03-31 | 2017-03-31 | Shock-absorbing member and side member of automobile |
US16/496,340 US10981601B2 (en) | 2017-03-31 | 2017-03-31 | Impact-absorbing member and side member of automobile |
KR1020197028239A KR102257663B1 (ko) | 2017-03-31 | 2017-03-31 | 자동차의 충격 흡수 부재 및 사이드 멤버 |
MX2019011293A MX2019011293A (es) | 2017-03-31 | 2017-03-31 | Miembro de absorcion de impactos y miembro lateral de automovil. |
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RU2019130392A3 (ja) | 2021-03-26 |
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