JP6034729B2 - Shock absorption mechanism for vehicles - Google Patents

Description

  The present invention relates to an impact absorbing mechanism for a vehicle that can absorb an impact load applied to the vehicle.

  For example, Patent Document 1 includes a front side member (frame member) extending in the vehicle front-rear direction and a crash box (shock absorbing member) made of CFRP and having one end in the longitudinal direction coupled to the front end of the front side member. A shock absorbing structure is disclosed.

  The crush box is provided with a reinforcing portion, and a gradual decreasing structure of the reinforcing width is formed by inclining the edge on the impact load input side of the reinforcing portion linearly with respect to the longitudinal direction. ) And the front side member (frame member) can be prevented from being broken.

JP 2010-195068 A

  However, since the crash box (impact absorbing member) disclosed in Patent Document 1 is composed only of CFRP, it exhibits high strength when an impact load is applied, but the deformation amount is small and exceeds the limit. Since it breaks at once, it is difficult to absorb the impact load for a long time.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle impact absorbing mechanism capable of absorbing an impact load continuously for a longer time.

To achieve the above object, the present invention comprises a bumper beam extending in the vehicle width direction, and a shock absorbing core material disposed on the front side of the bumper beam in the vehicle front-rear direction and having a hollow portion, The bumper beam is provided with a plurality of convex portions on the front side in the vehicle front-rear direction, and reinforcing plates that connect the plurality of convex portions are provided at the left and right end portions in the vehicle width direction of the respective convex portions. It is characterized by Rukoto.

According to the present invention, when an impact load is applied to the impact absorbing mechanism for a vehicle, the convex portion provided on the bumper beam increases the rigidity and strength in the elastic region and suppresses deformation thereof. First, the shock absorbing core material disposed on the front side of the bumper beam selectively plastically deforms to absorb the shock load. After the shock absorbing core material is plastically deformed to some extent, the bumper beam is then elastically deformed within the elastic region to absorb the impact load. As described above, according to the present invention, the impact load can be continuously absorbed by the plastic deformation caused by the shock absorbing core material in the first half and the elastic deformation caused by the bumper beam in the second half. As a result, in the present invention, a large impact load can be absorbed with a short displacement by the combined action of the impact absorbing core material and the bumper beam. In the case of a light collision, the bumper beam is not plastically deformed, and the shock absorbing core material is only plastically deformed. Therefore, it is only necessary to replace the shock absorbing core material, thereby reducing the repair cost. it can.
Furthermore, according to the present invention, by providing reinforcing plates at the left and right ends of the bumper beam, even if an impact load is applied, it is possible to suppress deformation such as opening and falling of the convex portions, and to form a convex shape. The parts can be restrained. As a result, in the present invention, it is possible to favorably support that the bumper beam is elastically deformed within a necessary range of an elastic region where the bumper beam can be elastically deformed.

  Further, according to the present invention, the convex portion extends in the vehicle front-rear direction, and each of the two wall portions is arranged vertically, and the front end portion is connected to the front end of each of the two wall portions in the vehicle front-rear direction. It is comprised by these.

  According to the present invention, the bumper beam convex portion is constituted by two wall portions and the front end portion connecting the two wall portions, so that the bumper beam is less likely to buckle. In the present invention, since the impact load can be absorbed by the two wall portions, for example, the impact load that could not be absorbed by the impact absorbing core material can be suitably absorbed by the two wall portions of the bumper beam. it can.

  Furthermore, the present invention is characterized in that a rear side of the shock absorbing core material in the vehicle front-rear direction is formed along the wall portion.

  According to the present invention, the rear part (rear side) of the shock absorbing core material has a shape that follows the wall part, so that the rear part is inserted between adjacent convex parts, or the rear part branches. Thus, a shape straddling the convex portion can be obtained. As a result, in the present invention, when the shock absorbing core material is assembled to the bumper beam, the shock absorbing core material can be easily positioned with respect to the bumper beam, and the shock absorbing core material can be prevented from falling off the bumper beam. it can. Furthermore, when an impact load is applied, the impact load can be reliably transmitted from the shock absorbing core material to the bumper beam convex portion, and the impact load absorbing performance in the convex portion can be reliably exhibited. Can do.

  Furthermore, the present invention is characterized in that a skeletal member extending along the vehicle front-rear direction is provided on the rear side of the bumper beam in the vehicle front-rear direction.

  ADVANTAGE OF THE INVENTION According to this invention, the function which absorbs the impact load provided to a bumper beam can be exhibited with respect to the skeleton member provided in the back of the bumper beam.

  Furthermore, the present invention is characterized in that a cover member is provided on the shock absorbing core material.

  According to the present invention, by providing the cover member on the shock absorbing core material, the shock load input to the shock absorbing core material can be leveled and transmitted to the bumper beam with respect to the local shock load input. For this reason, the impact-absorbing core material can be prevented from being crushed and the impact load can be sufficiently absorbed. Furthermore, by locking the cover member to the bumper beam, it is possible to prevent the shock absorbing core material from falling off the bumper beam, and to improve the assembling workability and to reliably absorb the impact load.

  Furthermore, the present invention is characterized in that the bumper beam is made of a composite material and the shock absorbing core material is made of an aluminum alloy.

  According to the present invention, an impact-absorbing core material made of an aluminum alloy (including foamable aluminum) having a hollow portion that is lightweight and excellent in absorbing impact load, and a lightweight composite material (for example, CFRP, GFRP, etc.) The bumper beam can absorb a large impact load even if the displacement is short.

  Furthermore, the present invention is characterized in that the shock absorbing core material has a honeycomb shape.

  According to the present invention, by making the impact-absorbing core material into a honeycomb shape, the weight can be further reduced and plastic deformation can be facilitated.

  Furthermore, the present invention is characterized in that the skeleton member is formed of a metal material.

  According to the present invention, for example, when the skeleton member that connects the front end portion of the front side frame of the vehicle body and the bumper beam is made of a metal material, when the elastic deformation of the bumper beam proceeds due to an impact load, the skeleton member Before the bumper beam breaks due to stress concentration in the vicinity of the fastening portion, it is possible to avoid the bumper beam being broken by the plastic deformation of the skeleton member.

  Furthermore, the present invention is characterized in that the metal material is an aluminum alloy.

  According to the present invention, a lightweight and easily deformable member can be obtained by using an aluminum alloy as the skeleton member. For this reason, the skeletal member can be preferentially crushed to absorb the impact load before the impact load is large and the bumper beam reaches a displacement that causes destruction.

  In the present invention,

1 is a perspective view of a vehicle impact absorbing mechanism according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the vehicle impact absorbing mechanism shown in FIG. 1. It is the perspective view seen from the arrow Z direction of FIG. It is a partially broken front view of the vehicle impact absorbing mechanism shown in FIG. It is a top view of the shock absorption mechanism for vehicles shown in FIG. FIG. 2 is a right side view of the vehicle impact absorbing mechanism shown in FIG. 1. It is a longitudinal cross-sectional view along the VII-VII line of FIG. (A)-(c) is a longitudinal cross-sectional view of the bumper beam and impact-absorbing core material in which the convex-shaped part which concerns on the 1st-3rd modification was provided, respectively. (A), (b) is a longitudinal cross-sectional view which shows the state with which an impact-absorbing core material is connected ranging over the convex-shaped part of a bumper beam. (A)-(e) shows the state which the impact-absorbing core material inserted between two convex-shaped parts was plastically deformed following the elastic deformation region of the bumper beam by applying an impact load. It is sectional drawing. (A) is explanatory drawing which showed the state which an impact load is provided and a convex-shaped part deform | transforms in the comparative example without a reinforcement plate, (b) is an impact load in this embodiment in which the reinforcement plate was provided. It is explanatory drawing which showed the state by which a convex-shaped part is restrained even if it is provided. FIG. 5 is a characteristic diagram showing a relationship between an impact load and a displacement amount in the vehicle impact absorbing mechanism according to the present embodiment and a comparative example. (A)-(d) shows the deformation | transformation state at the time of the impact load being provided with respect to the impact-absorbing mechanism for vehicles over time.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. 1 is a perspective view of a vehicle impact absorbing mechanism according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is a perspective view seen from the direction of arrow Z in FIG. 1, and FIG. 1 is a partially broken front view, FIG. 5 is a plan view of FIG. 1, FIG. 6 is a right side view of FIG. 1, and FIG. 7 is a longitudinal sectional view taken along line VII-VII of FIG. Note that “front and rear” and “up and down” indicated by arrows in each figure indicate the front and rear direction and vertical direction of the vehicle body, and “left and right” indicate the left and right direction (vehicle width direction) as viewed from the driver's seat. ing.

  As shown in FIGS. 1 and 2, a vehicle impact absorbing mechanism 10 according to an embodiment of the present invention is applied to a front bumper provided at a vehicle body front portion (not shown). The vehicle impact absorbing mechanism 10 includes a bumper beam 12 extending in the vehicle width direction, and an impact absorbing core material 14 fixed to the front side (front surface) of the bumper beam 12 in the vehicle front-rear direction. The bumper beam 12 is formed of a composite material such as CFRP (Carbon Fiber Reinforced Plastic) or GFRP (Glass Fiber Reinforced Plastic). The shock absorbing core material 14 is made of a metal material such as aluminum or an aluminum alloy, for example.

  Further, the vehicle impact absorbing mechanism 10 includes a pair of extension members (frame members) 16 fixed to the rear side (rear surface) of the bumper beam 12 in the vehicle front-rear direction at the left and right ends along the vehicle width direction of the bumper beam 12. The bumper beam 12 includes a pair of reinforcing plates 18 fixed to the front side (front surface) of the bumper beam 12 at both left and right ends along the vehicle width direction. The vehicle impact absorbing mechanism 10 is not limited to the front bumper but can be applied to the rear bumper.

  The bumper beam 12 is provided with at least one convex portion 20 on the front side (front surface) in the vehicle front-rear direction. In the present embodiment, the longitudinal section orthogonal to the axial direction (vehicle width direction) is substantially U-shaped (see FIG. 7), and the two convex portions 20 projecting toward the front of the vehicle are parallel to the vehicle width direction. It is provided so that it may extend.

  Further, the two convex portions 20 are continuous along the vertical direction of the vehicle via the vertical wall 21 located behind the bumper beam 12, and between the upper and lower convex portions 20 and the vertical wall 21. A concave portion 22 having a rectangular cross section recessed at the vehicle rear side is formed. The recess 22 is provided on the front surface of the bumper beam 12 so as to extend along the vehicle width direction. In addition, although the two convex-shaped parts 20 are comprised by the same cross-sectional shape which protruded toward the vehicle front, respectively, you may be comprised by a different cross-sectional shape so that it may mention later.

  In the longitudinal cross section shown in FIG. 7, the convex portion 20 extends in the vehicle front-rear direction, and each of the two wall portions 24 disposed above and below each other with a predetermined interval therebetween, and the vehicle front-rear portions of the two wall portions 24. And a front end portion 26 connected to the front end in the direction.

  Here, a modified example of the convex portion 20 provided in the bumper beam 12 will be described with reference to FIGS. 8 and 9, the bumper beam 12 and the shock absorbing core material 14 are illustrated in a simplified cross-sectional shape, and the extension member 16 is not illustrated.

  FIG. 8A is a longitudinal sectional view of the bumper beam and the shock absorbing core material provided with the convex portions according to the first modification. The bumper beam 12a has a single convex portion 20a, and has a single front end portion 26a that is formed slightly wider on the front surface, and is spaced apart from each other from the upper end and the lower end of the front end portion 26a toward the rear of the vehicle. It is comprised by the two wall parts 24a extended so that distance may increase gradually, and the rear-end flange part 28 bent in the up-down direction from the rear end of the wall part 24a.

  FIG. 8B is a longitudinal sectional view of the bumper beam and the shock absorbing core material provided with the convex portions according to the second modification. The bumper beam 12b has two convex portions 20b having the same shape, and has two front end portions 26b formed slightly narrow on the front surface, and the front end portion 26b from the upper end and the lower end toward the rear of the vehicle. It is comprised by the two wall parts 24b extended so that the separation distance which opposes may reduce gradually, and the vertical wall 21 which connects the wall part 24b.

  FIG.8 (c) is a longitudinal cross-sectional view of the bumper beam and the shock-absorbing core material provided with the convex part which concerns on a 3rd modification. The bumper beam 12 c has two convex portions 20 c and 20 d having different shapes, and the two convex portions 20 c and 20 d are continuously provided in the vertical direction via the vertical wall 21.

  The convex portion 20c on the upper side of the two convex portions 20c and 20d has a front end portion 26c having a slightly narrow flange shape on the front surface and a single wall extending rearward from the lower end of the front end portion 26c. Part 24c. The convex portion 20d on the lower side has a single front end portion 26d formed slightly narrow on the front surface, and the separation distance facing each other from the upper end and lower end of the front end portion 26d toward the rear of the vehicle gradually increases. The two wall portions 24c extending in this manner and the rear flange portion 28 bent in a substantially L shape from the rear end of the lower wall portion 24c downward.

  Note that mounting flanges 30 for mounting the pair of extension members 16 are provided at the upper and lower ends of the left and right ends along the vehicle width direction of the bumper beam 12.

  The shock absorbing core material 14 includes a core body 34 having a honeycomb shape 32 (see FIG. 4) in which a plurality of through-holes (hollow portions) having a regular hexagonal cross section are formed along the vehicle longitudinal direction, and the core body 34. And a cover member 36 that holds the core body 34 stored in the storage space and is fixed to the bumper beam 12. The cover member 36 is a box-shaped member formed of, for example, CFRP and having an open rear end side (see FIG. 7). At the four corners of the cover member 36, mounting flanges 38 (see FIG. 2) for fastening the cover member 36 to the front end portion 26 of the bumper beam 12 via screw members are provided.

  A rear portion (rear side) 34 a of the core main body 34 constituting the shock absorbing core material 14 in the vehicle front-rear direction is formed along the two wall portions 24 constituting the convex portion 20 of the bumper beam 12. That is, in the present embodiment, as shown in FIG. 7, the rear portion 34a of the core body 34 is inserted into (inserted into) the recess 22 formed between the two wall portions 24 facing each other. The rear portion 34a is sandwiched between the two wall portions 24. The rear portion 34a of the core body 34 has a convex shape substantially corresponding to the concave portion 22, and the thickness along the vertical direction of the rear portion 34a of the core main body 34 is separated along the vertical direction of the inner walls of the two wall portions 24. It is set slightly larger than the distance.

  In the present embodiment, a configuration is adopted in which the rear part 34a of the core body 34 of the shock absorbing core material 14 is inserted and sandwiched between the two wall parts 24 of the convex part 20 facing each other. However, the present invention is not limited to this.

  FIG. 9A and FIG. 9B are longitudinal sectional views showing a state in which the shock absorbing core material is coupled across the bump-beam convex portion. As shown in FIGS. 9A and 9B, the rear portion 34a of the core body 34 is divided into two at the upper side and the lower side, and the two branch portions 40 are formed as a single unit. It is preferable to sandwich the convex portion 20a (20d) across the vertical direction. The convex portion 20a shown in FIG. 9 (a) uses the convex portion 20a according to the first modification shown in FIG. 8 (a), and the convex portion 20d shown in FIG. Since the lower convex part 20d which concerns on the 3rd modification shown by FIG.8 (c) is used, the detailed description is abbreviate | omitted.

  FIGS. 10A to 10E show a state in which the impact absorbing core material inserted between the two convex portions is plastically deformed following the elastic deformation region of the bumper beam by applying an impact load. FIG.

  Furthermore, the core main body 34 shown in FIG. 7 is configured such that the entire rear portion 34 a is inserted into the recess 22 formed by the two wall portions 24, and the rear portion 34 a contacts the vertical wall 21 of the recess 22. On the other hand, for example, as shown in FIG. 10A, the rear portion 34 a of the core body 34 is inserted partway into the recess 22, and the space between the rear portion 34 a and the vertical wall 21 of the recess 22 is The part 42 may be formed. In addition, without providing the space portion 42, the rear portion 34a of the core body 34 and the vertical wall 21 of the recess 22 may be inserted in advance until they contact each other.

  In this case, when an impact load is applied to the vehicle impact absorbing mechanism 10 and the impact absorbing core material 14 is pressed, the core body 34 moves along the space 42 as shown in FIG. The rear end surface 34b of the core body 34 and the vertical wall 21 of the recess 22 abut against each other when pressed rearward of the vehicle. Further, as shown in FIG. 10C, after the impact absorbing core material 14 is plastically deformed by the impact load until it is substantially flush with the front end portion 26 of the bumper beam 12, as shown in FIG. Due to the impact load applied to both the bumper beam 12 and the shock absorbing core material 14, the bumper beam 12 is elastically deformed in the elastic deformation region, and at the same time, the shock absorbing core material 14 is further plastically deformed. Finally, as shown in FIG. 10 (e), the bumper beam 12 elastically deformed in the elastic deformation region returns to the original shape by the dimension α by the action of the spring back. As described above, in the embodiment shown in FIGS. 10A to 10E, when an impact load is applied, the plastic deformation amount of the shock absorbing core material 14 is made to follow (maintain) to the elastic deformation region of the bumper beam 12. (See FIG. 10 (d)). For this reason, there is an advantage that the amount of shock load absorbed by the shock-absorbing core material 14 (the amount of plastic deformation of the shock-absorbing core material 14) can be increased by the amount of follow-up (sustained).

  As shown in FIG. 2, the extension member 16 is formed of a metal material, preferably an aluminum alloy. The extension member 16 includes an extension main body 46 formed of a hollow rectangular parallelepiped having a partition wall 44 therein, a front plate 48 joined to a front end along the axial direction (vehicle longitudinal direction) of the extension main body 46, and the extension main body 46. The rear plate 50 is joined to the rear end along the axial direction.

  Inside the extension body 46, there are provided an upper side hollow portion 52a and a lower side hollow portion 52b penetrating in the axial direction with the partition wall 44 therebetween. Further, the front plate 48 is formed with a rectangular opening 54 that penetrates both the front and back surfaces, and a screw hole for screwing the mounting flange 30 of the bumper beam 12. A pair of bent portions 56 bent in a V-shaped cross section are provided in the vertical direction with the opening 54 interposed therebetween, and the front end of the extension body 46 is positioned and joined between the pair of bent portions 56.

  Further, the rear plate 50 is provided with a pair of lateral ribs 58 that protrude toward the front of the vehicle and extend along the vehicle width direction. The horizontal ribs 58 are positioned when the rear plate 50 is joined to the rear end of the extension main body 46. The front plate 48 and the rear plate 50 are joined over the entire circumference of the front end and the rear end of the extension main body 46 through welding means such as MIG welding, for example.

  A pair of reinforcing plates 18 are connected to the front surfaces of the left and right end portions along the vehicle width direction of the bumper beam 12 to connect the two convex portions 20 continuous in the vertical direction. The pair of reinforcing plates 18 have a hat shape in cross section, and are formed in the same shape. Each reinforcing plate 18 includes an upper flange portion 60a fastened to the front end portion 26 of the upper convex portion 20, a lower flange portion 60b fastened to the front end portion 26 of the lower convex portion 20, and an upper flange. It has the connection part 62 which connects the part 60a and the lower flange part 60b.

  FIG. 11A is an explanatory diagram showing a state in which a convex portion is deformed by applying an impact load in a comparative example without a reinforcing plate, and FIG. 11B is the present embodiment in which the reinforcing plate is provided. FIG. 3 is an explanatory diagram showing a state where the convex portion is restrained even when an impact load is applied.

  In the comparative example without the reinforcing plate 18, as shown in FIG. 11A, when an impact load (bending moment) is applied to the bumper beam 12, the separation distance between the two convex portions 20 that are continuous in the vertical direction. Increases and opens outwardly, or the distance between the two convex portions decreases and falls down and so forth (see the broken line in FIG. 11A). As a result, in the comparative example without the reinforcing plate 18, stress is concentrated on the left and right end portions of the bumper beam 12 by applying an impact load and elastically deforming the two convex portions 20.

  On the other hand, in this embodiment in which the reinforcing plate 18 that connects the two convex portions is provided, when the impact load (bending moment) is applied to the bumper beam 12, the two convex portions are formed by the reinforcing plate 18. Since 20 is constrained to the original shape, the entire bumper beam 12 can be elastically deformed. As a result, it is preferable that stress is concentrated on the left and right ends of the bumper beam by the reinforcing plate 18 and the bumper beam 12 is elastically deformed within a necessary range of an elastic region where the bumper beam 12 can be elastically deformed. Can be supported.

  The vehicle impact absorbing mechanism 10 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

  FIG. 12 is a characteristic diagram showing the relationship between the impact load and the displacement amount in the vehicle impact absorbing mechanism and the comparative example according to the present embodiment, and FIGS. 13A to 13D are diagrams illustrating the vehicle according to the present embodiment. 2 shows the deformation state when an impact load is applied to the impact absorbing mechanism for use over time. In FIG. 12, the characteristic curve of the vehicle impact absorbing mechanism 10 according to the present embodiment is indicated by a solid line, and the characteristic curve of a comparative example relating to an impact absorbing member (not shown) formed only of CFRP is indicated by a broken line. . FIG. 13A shows an original shape to which no impact load is applied. Further, the horizontal axis in FIG. 12 indicates time (time t) in addition to the displacement amount for convenience.

  For example, when an impact load is applied to the vehicle impact absorbing mechanism 10 due to a vehicle collision or the like, deformation is suppressed by the convex portion 20 provided on the bumper beam 12. The provided shock-absorbing core material 14 is plastically deformed to absorb the impact load, and the shock-absorbing core material 14 is crushed entirely by the cover member 16 (see FIG. 13B). Due to the load that increases as the plastic deformation of the shock absorbing core material 14 progresses, the elastic deformation of the bumper beam 12 gradually proceeds to absorb the shock load (see FIG. 13C). Further, the pair of extension members 16 provided at the left and right ends of the bumper beam 12 in the vehicle width direction are plastically deformed to absorb the impact load while the bumper beam 12 is maintained in the elastic deformation within the elastic region (FIG. 13D). )reference).

  For example, in the characteristic curve of the vehicle impact absorbing mechanism 10 indicated by the solid line in FIG. 12, the shock absorbing core material 14 is plastically deformed and absorbs the impact load in the range before time t. . Further, in the range after time t in FIG. 12, the bumper beam 12 is elastically deformed in the elastic region to absorb the impact load, and the pair of extension members is maintained while the bumper beam 12 maintains the elastic deformation in the elastic region. Reference numeral 16 denotes a state in which the impact load is absorbed by plastic deformation.

  In the vehicle impact absorbing mechanism 10 according to the present embodiment, a relatively low impact load can be absorbed in a range before the time t, whereas in the range after the time t, the convex portion 20. As a result, the rigidity and strength of the bumper beam 12 are increased, so that a high impact load (peak value) can be absorbed compared to the range before time t.

  On the other hand, in the comparative example indicated by the broken line, a relatively high impact load can be absorbed in the initial stage, but the impact load absorbed thereafter decreases rapidly as the displacement amount increases. As a result, in the comparative example, a sufficient impact load cannot be absorbed over a long time.

  As described above, in this embodiment, the impact load is continued for a longer time due to the plastic deformation by the shock absorbing core material 14 (range before time t) and the elastic deformation by the bumper beam 12 (range after time t). Can be absorbed. As a result, in the present embodiment, a large impact load amount can be absorbed with a short displacement amount by the combined action of the impact absorbing core material 14 and the bumper beam 12. Further, in the case of a light collision, the bumper beam 12 is not elastically deformed and the shock absorbing core material 14 is only plastically deformed. Therefore, it is only necessary to replace the shock absorbing core material 14 with a new one. Cost can be reduced.

  In the present embodiment, the bumper beam 12 has a structure in which the bumper beam 12 is less likely to buckle by forming the convex portion 20 of the bumper beam 12 by two wall portions 24 and a front end portion 26 connecting the two wall portions 24. be able to. In the present embodiment, since the impact load can be absorbed by the two wall portions 24, for example, the impact load that could not be absorbed by the impact absorbing core material 14 is suitable for the two wall portions 24 of the bumper beam 12. Can be absorbed into.

  Further, in the present embodiment, the rear portion 34a (rear side) of the shock absorbing core material 14 has a shape that follows the wall portion 24, so that the rear portion 34a is inserted between the adjacent convex portions 20 (see FIG. 7 and FIG. 10) or a shape in which the branching portion 40 of the rear portion 34 a straddles the convex portion 20 (see FIG. 9). As a result, in this embodiment, when the shock absorbing core material 14 is assembled to the bumper beam 12, the shock absorbing core material 14 can be easily positioned with respect to the bumper beam 12, and the shock absorbing core material 14 is detached from the bumper beam 12. Can be prevented. Further, when an impact load is applied, the impact load can be reliably transmitted from the impact absorbing core material 14 to the convex portion 20 of the bumper beam 12 and the shock load absorbing performance in the convex portion 20 is ensured. Can be demonstrated.

  Furthermore, in this embodiment, the function of absorbing the impact load applied to the bumper beam 12 can be exerted on the pair of extension members 16 provided behind the bumper beam 12.

  Furthermore, in the present embodiment, by providing the reinforcing plates 18 at both the left and right ends of the bumper beam 12, even when an impact load is applied, deformation such as opening and collapse of the convex portions 20 is suppressed. Thus, the convex portions 20 can be suitably restrained. As a result, in the present embodiment, it is possible to favorably support that the bumper beam 12 is elastically deformed within a necessary range of an elastic region in which the bumper beam 12 is elastically deformable.

  Furthermore, in this embodiment, by providing the shock absorbing core material 14 with the cover member 36 that covers the core body 34, the shock load input to the shock absorbing core material 14 is leveled against the local shock load input. Can be transmitted to the bumper beam 12. For this reason, the impact-absorbing core material 14 can be prevented from being crushed and the impact load can be sufficiently absorbed. Furthermore, by screwing the cover member 36 to the mounting flange 38 bumper beam 12, it is possible to prevent the shock absorbing core material 14 from falling off the bumper beam 12, and to improve the assembly workability and to reliably absorb the impact load. .

  Furthermore, in the present embodiment, the impact absorbing core material 14 made of an aluminum alloy (including foamable aluminum) that is lightweight and excellent in impact load absorption and a lightweight composite material (for example, CFRP, GFRP, etc.) are used. The bumper beam 12 can absorb a large impact load even if the displacement is short.

  Furthermore, in the present embodiment, the honeycomb body 32 (see FIG. 4) that penetrates the core body 34 of the shock absorbing core material 14 along the vehicle front-rear direction makes it possible to further reduce weight and facilitate plastic deformation. can do. In addition, by adopting a honeycomb shape, the intense absorption performance can be enhanced.

  Furthermore, in the present embodiment, for example, a pair of extension members 16 (frame members) that connect the front end portion of the front side frame of the vehicle body (not shown) and the bumper beam 12 are made of a metal material, so that the bumper beam is caused by an impact load. As the elastic deformation of 12 progresses, the bumper beam 12 is destroyed by the plastic deformation of the pair of extension members 16 before the bumper beam 12 breaks due to the stress concentration in the vicinity of the fastening portion with the extension member 16. It can be avoided.

  Furthermore, in the present embodiment, the pair of extension members 16 are made of an aluminum alloy, so that the light weight and easily deformable members can be obtained. Therefore, the pair of extension members 16 can be preferentially squeezed to absorb the impact load before the impact load is large and the bumper beam 12 reaches a displacement that causes destruction.

DESCRIPTION OF SYMBOLS 10 Vehicle shock absorption mechanism 12 Bumper beam 14 Shock absorption core material 16 Extension member (frame member)
18 Reinforcing plate 20, 20a to 20d Convex part 24 Wall part 26 Front end part 32 Honeycomb shape 34 Core body 34a Rear part (rear side)
36 Cover member

Claims (9)

A bumper beam extending in the vehicle width direction,
An impact absorbing core material disposed on the front side of the bumper beam in the vehicle longitudinal direction and having a hollow portion;
With
The bumper beam is provided with a plurality of convex portions on the front side in the vehicle longitudinal direction,
Wherein the left and right end portions in the vehicle width direction of each convex portion, a vehicle impact absorbing mechanism reinforcing plate, characterized in Rukoto provided for connecting the plurality of convex portions. The vehicle impact absorbing mechanism according to claim 1,
The convex portion extends in the vehicle front-rear direction, and is constituted by two wall portions that are arranged vertically, and a front end portion that is connected to the front end of each of the two wall portions in the vehicle front-rear direction. A shock absorbing mechanism for a vehicle characterized by the above. The impact absorbing mechanism for a vehicle according to claim 2,
A rear side of the shock absorbing core material in the vehicle front-rear direction is formed along the wall portion. The impact absorbing mechanism for a vehicle according to any one of claims 1 to 3,
A vehicle impact absorbing mechanism, wherein a skeleton member extending along the vehicle longitudinal direction is provided on the rear side of the bumper beam in the vehicle longitudinal direction. The impact absorbing mechanism for a vehicle according to any one of claims 1 to 4 ,
A shock absorbing mechanism for a vehicle, wherein the shock absorbing core material is provided with a cover member. The impact absorbing mechanism for a vehicle according to any one of claims 1 to 5 ,
The bumper beam is made of a composite material, and the shock absorbing core material is made of an aluminum alloy. The impact absorbing mechanism for a vehicle according to any one of claims 1 to 6 ,
The shock absorbing mechanism for a vehicle, wherein the shock absorbing core material has a honeycomb shape. The impact absorbing mechanism for a vehicle according to any one of claims 4 to 7 ,
The skeleton member is made of a metal material, and the impact absorbing mechanism for a vehicle is characterized in that the skeleton member is made of a metal material. The impact absorbing mechanism for a vehicle according to claim 8 ,
The shock absorbing mechanism for a vehicle, wherein the metal material is an aluminum alloy.

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