JP2018192817A - Bumper reinforcement - Google Patents

Abstract

To enable prescribed buffer load to be applied by causing buckling at middle position absolutely even though there is difference in support strength at both ends supporting bumper reinforcement.SOLUTION: The bumper reinforcement includes a reinforcement member 30 which is fixedly set up inside a body member with closed cross-sectional shape. The reinforcement member 30 is formed of a central place element 30A and both ends place elements 30B and is configured to be a shape in which the central place element 30A has stronger rigidity than both ends place elements 30B. The shape structure forms the central place element 30A as beat surface shape and as wide structure.SELECTED DRAWING: Figure 5

Description

  The present invention relates to bumper reinforcement. In particular, the present invention relates to a bumper reinforcement that is disposed as a core material of a bumper structure that is provided at the front or rear of an automobile and receives a load at the time of a collision.

  A bumper structure that receives a collision load at the time of a vehicle collision is provided at the front or rear of the automobile body. The bumper structure is provided with bumper reinforcement as a core material. The bumper reinforcement is arranged in a long shape in the width direction of the automobile body, and is supported by being connected to a frame member of the automobile body by a bumper support structure at both end positions in the width direction of the automobile body. As the bumper support structure, a crash box (C / B) in which an energy absorbing action at the time of a vehicle collision is usually used. When the crash box is not used, the side members are connected and coupled to perform energy absorption.

  There are various types of bumper reinforcement configurations. For example, bumper reinforcement has a form which consists of a main-body member and a reinforcement member. In this case, the main body member includes a main body member having a hat-shaped cross section, and a planar plate member that is disposed so as to close the opening portion on the opening side of the main body member and has the main body member closed to have a cross-sectional shape. Become. This main body member is formed as a long member, and its longitudinal direction is arranged in the width direction of the automobile.

  The reinforcing member is disposed inside the main body member having a closed cross-sectional shape for reinforcement when a collision load is input to the center position of the main body member. The arrangement position is a central position in the longitudinal direction of the main body member formed as a long member. And the cross-sectional shape of the reinforcing member is formed in a square cross section formed facing the internal shape of the closed cross-sectional shape of the main body member. In this way, the bumper reinforcement formed by the main body member and the reinforcing member is arranged so that the planar plate member side of the main body member becomes the input side of the collision load. Thereby, when a collision load is input to the central position of the bumper reinforcement, the load received by the bumper reinforcement is increased by the reinforcing action of the reinforcing member.

JP 2008-265738 A JP 2005-263114 A JP 2017-47818

  By the way, in the bumper reinforcement of the above-described form, as a characteristic of receiving the collision load when the collision load is input to the central position of the bumper reinforcement, buckling (breaking) is caused at the central position. preferable. In other words, when a collision load is input to the bumper reinforcement, if the stress is concentrated at the center position and buckling occurs, the collision load received on both sides of the bumper reinforcement can receive the designed load. .

  However, if the support strength of the bumper support structure such as a crash box (C / B) that supports the bumper reinforcement at both ends is biased, buckling occurs at a position biased to the left and right from the center position. When buckling occurs in such a biased position, the targeted collision load may not be received by the bumper reinforcement.

  When buckling occurs at a biased position, an acting force in the peeling direction is exerted on the welded portion of the flange portion between the main member having a closed cross-sectional shape and the planar plate member due to the buckling. Since welding is strong against shearing but weak against peeling, the welded part is peeled off and the main member and the planar plate member are broken. For this reason, it is because the load fall of bumper reinforcement arises.

  Thus, the present invention was devised in view of the above points, and the problem to be solved by the present invention is that even when there is a difference in support strength between both ends supporting the bumper reinforcement. It is to ensure that buckling occurs at the center position so that a predetermined collision load can be received.

  In order to solve the above problems, the bumper reinforcement according to the present invention takes the following means.

  According to a first aspect of the present invention, an elongated main body member disposed in the vehicle width direction closes a main body member having a hat-shaped cross section and an opening of the main body member on the opening side of the main body member. A reinforcing plate having a rectangular cross section is disposed inside a central portion in the longitudinal direction of the main body member having the closed cross-sectional shape. The bumper reinforcement is arranged such that the planar plate member is on the collision load input side, and the rigidity of the reinforcing member in the direction in which the collision load is input is such that the central portion in the longitudinal direction of the reinforcing member is The bumper reinforcement is configured to have a stronger shape than both side portions connected to both sides from the central portion.

  According to the first aspect, in order to reinforce the main body member having the closed cross-sectional shape, the reinforcing member disposed at the central portion of the main body member has rigidity in the direction in which the collision load is input, and the central portion is on both sides. The shape is stronger than the region. As a result, even if there is a difference in the support rigidity at both ends of the bumper reinforcement, when a collision load is applied, stress concentration occurs in the central part with a highly rigid configuration, and buckling occurs at that position. Produce. Thereby, the bumper reinforcement can receive a predetermined collision load.

  The second invention of the present invention is the bumper reinforcement according to the first invention described above, wherein the shape configuration having a strong rigidity at the central portion of the reinforcing member is a collision on a formation surface of a cross-sectional square forming the reinforcing member. Bumper reinforcement in which the forming surface orthogonal to the longitudinal direction with respect to the direction in which the load is input has a convex or concave bead surface shape.

  According to the said 2nd invention, the shape structure with strong rigidity of the center site | part in a reinforcement member is comprised by the convex-shaped or concave bead surface shape. According to the said structure, a strong shape structure can be achieved by the comparatively simple structure called bead surface shape.

  A third aspect of the present invention is the bumper reinforcement according to the first aspect described above, wherein the rigid shape configuration of the central portion of the reinforcing member is a collision on a formation surface of a cross-sectional square that forms the reinforcing member. In the bumper reinforcement, the formation width of the formation surface perpendicular to the longitudinal direction with respect to the direction in which the load is input is wider at the central portion than at the both side portions.

  According to the said 3rd invention, it is set as a rigid rigid shape structure by making the formation surface of a center site | part wider than the formation surface of a both-sides site | part. According to the said structure, a strong shape structure can be achieved by the comparatively simple structure of changing the formation width of the formation surface orthogonal to a longitudinal direction with respect to the direction where the collision load in a reinforcement member inputs.

  A fourth invention of the present invention is the bumper reinforcement according to the first invention described above, wherein the shape configuration having a strong rigidity at the central portion of the reinforcing member is a collision on a formation surface of a cross-sectional square forming the reinforcing member. The direction in which the collision load is input on the formation surface of the cross-sectional quadrangle that forms the reinforcing member, while the formation surface orthogonal to the longitudinal direction with respect to the direction in which the load is input is a convex or concave bead surface shape With respect to the bumper reinforcement, the formation width of the formation surface perpendicular to the longitudinal direction is wider at the center portion than at the both side portions.

  The fourth invention is configured by combining the configuration according to the second invention described above and the configuration according to the third invention. As a result, the rigidity of the central part of the reinforcing member can be surely formed stronger than the rigidity of both side parts. Further, by combining both configurations, the strength of rigidity can also be set appropriately.

  A fifth invention of the present invention is the bumper reinforcement according to the first invention or the second bumper reinforcement described above, wherein the bead having a bead surface shape is a convex shape.

  According to the fifth aspect, the bead has a convex shape. The convex bead can form a higher rigidity in the collision load direction than the concave bead.

  The sixth aspect of the present invention is the bumper reinforcement according to the fifth aspect of the present invention, wherein the reinforcing member forming surface forming the bead is the foremost surface in the direction in which the collision load is input on the forming surface having a quadrangular cross section. It is a bumper reinforcement that is the formation surface of.

  According to the sixth aspect, the formation surface on which the bead is formed is the foremost formation surface in the direction in which the collision load is input. Thereby, a collision load can be efficiently received by the foremost formation surface.

  According to the present invention of the above-described means, even when there is a difference in support strength between both ends supporting the bumper reinforcement, a predetermined collision load can be received by reliably buckling at the center position. Can be.

It is the schematic which shows the arrangement position of the bumper structure with respect to a motor vehicle body. It is the perspective view which looked at the whole bumper reinforcement shape from diagonally upper left. It is the perspective view which looked and showed the arrangement structure of the main body member and reinforcement member which comprise a main body member similarly to FIG. It is the IV-IV sectional view taken on the line of FIG. It is the perspective view which looked at the reinforcement member single item from the diagonally upper left back. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is the VII-VII sectional view taken on the line of FIG. It is a figure which shows the normal state which the collision load added to bumper reinforcement and produced buckling in the center position. It is a figure which shows the abnormal state which produced the buckling in the position where the collision load was added to bumper reinforcement and it deviated from the center position to the left direction. The bumper reinforcement displacement and load change characteristic diagram when a collision load is applied is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the “right / left” direction display is a direction viewed from the passenger compartment of the automobile. In addition, the “front / rear” distinguishing display attached to the prefix of each member and part indicates a relative positional relationship in the forward and backward traveling directions of the vehicle when the bumper reinforcement is mounted on the vehicle. Similarly, the “upper / lower” distinction display also indicates a relative positional relationship viewed in the height direction.

  First, FIG. 1 shows an arrangement position of a bumper structure 10 in an automobile. The bumper structure 10 is usually disposed in the vehicle width direction with respect to the vehicle body 12 at the front and rear portions of the vehicle body 12. In FIG. 1, the front of the vehicle body 12 is indicated by an arrow Fr, and the rear is indicated by an arrow Rr. The automobile compartment is formed at the position of the automobile body 12. The bumper structure 10 includes a bumper reinforcement 14, a bumper covering member 16, and a bumper support structure 18. The bumper reinforcement 14 is disposed as a core material on the strength of the bumper structure 10. The bumper covering member 16 is disposed so as to cover the front surface of the bumper reinforcement 14. The bumper covering member 16 is disposed on the outermost surface of the bumper structure 10 and has a configuration in consideration of appearance. Usually, it is made of a resin suitable for molding a design.

  The bumper support structure 18 is disposed between the frame member (not shown) of the vehicle body 12 and the bumper reinforcement 14 at both ends of the bumper reinforcement 14 in the longitudinal direction (width direction when viewed from the vehicle body 12). Is done. The bumper reinforcement structure 18 transmits the collision load received by the bumper reinforcement 14 to the automobile body 12 and receives it. In the present embodiment, the bumper support structure 18 is formed of a structural member capable of absorbing collision energy called a crash box (C / B) and a side member.

  In the following embodiments, the bumper reinforcement 14 disposed in the front portion of the automobile body 12 will be described as an example.

  Since the bumper structure 10 of the present embodiment has the above-described arrangement configuration, the collision load F acting on the center position of the bumper structure 10 due to the frontal collision of the automobile is received as follows. First, it is received by the bumper covering member 16 and supported by the bumper reinforcement 14. The load acting on the bumper reinforcement 14 is received by the vehicle body 12 via a crash box (C / B) as the bumper support structure 18 disposed at both ends of the bumper reinforcement 14. At this time, the crash box (C / B) absorbs the collision energy.

  As shown in the cross-sectional view of FIG. 4, the bumper reinforcement 14 includes a main body member 20 and a reinforcing member 30. The main body member 20 includes a main member 22 having a hat-shaped cross section and a planar plate member 24. The planar plate member 24 is disposed so as to close the opening of the main member 22 having a cross-sectional hat shape, and the main body member 20 is closed to have a cross-sectional configuration. The reinforcing member 30 has a rectangular frame shape and is disposed inside the main body member 20 having a closed sectional shape. And the bumper reinforcement 14 of this embodiment is arrange | positioned so that the collision load F may input into the planar plate member 24 side.

  FIG. 2 is a perspective view of the entire shape of the bumper reinforcement 14 as viewed from the upper left side. The bumper reinforcement 14 is formed in a curved shape in which both ends in the longitudinal direction are retreated. 4 described above is a cross-sectional view taken along line IV-IV in FIG. FIG. 3 is a perspective view of the configuration of the main body member 22 forming the main body member 20 and the reinforcing member 30 disposed in the main body member 22 as seen from the upper left side in the same manner as FIG. As shown in FIG. 3, the reinforcing member 30 is disposed at the center position of the long bumper reinforcement 14. In this embodiment, the range in which the reinforcing member 30 is disposed is within the range between the crash boxes 18 as the support structures disposed at both ends shown in FIG. Thereby, the collision load F input to the center position of the bumper reinforcement 14 is received by the rigidity of the bumper reinforcement 14 reinforced by the reinforcing member 30.

  As shown in FIG. 4, the cross-sectional hat-shaped main member 22 constituting the main body member 20 includes a rear side plate portion 22A, an upper side plate portion 22B, and a lower side plate portion 22C. On the opening side of the upper side plate portion 22B, an upper flange portion 22D is formed extending upward as viewed in FIG. On the opening side of the lower side plate portion 22C, a lower flange portion 22E is formed extending downward as viewed in FIG. The planar plate member 24 is applied to an upper flange portion 22D and a lower flange portion 22E formed on the opening side of the main member 22, and is joined and fixed by welding W1 and W2. Thereby, the closed cross-sectional shape of the main body member 20 is made. Welding is spot welding in this embodiment. The same applies to the welding described below. In addition, the main body member 22 and the planar plate member 24 constituting the main body member 20 are made of steel plates in this embodiment.

  The reinforcing member 30 shown in FIG. 5 is disposed inside the main body member 20 having a closed cross-sectional shape as shown in FIG. The cross-sectional shape of the reinforcing member 30 is a rectangular frame shape as shown in FIG. The frame shape includes a front face plate portion 32, a rear face plate portion 34, an upper face plate portion 36, and a lower face plate portion 38. The upper face plate portion 36 and the lower face plate portion 38 are divided and formed. The upper face plate portion 36 is divided and formed into an upper front face plate portion 36A and an upper rear face plate portion 36B, and the divided portions are partially overlapped and joined by welding W3. Similarly, the lower face plate portion 38 is divided into a lower front face plate portion 38A and a lower rear face plate portion 38B, and the divided portions are partially overlapped and joined by welding W4 to be integrated. In addition, the reinforcing member 30 is also made of a steel plate in the present embodiment, like the main body member 20 described above.

  As shown in FIG. 4, the main body member 20 and the reinforcing member 30 are integrated by joining the planar plate member 24 constituting the main body member 20 and the front face plate portion 32 of the reinforcing member 30 by welding W5. Yes. Further, the rear side plate portion 22A of the main member 22 constituting the main body member 20 and the rear side plate portion 34 of the reinforcing member 30 are joined and integrated by welding W6.

  The reinforcing member 30 shown in FIG. 5 is illustrated with the upper side as the front direction of the automobile. The reinforcing member 30 is formed by integrally connecting a central portion 30A at a central position in the longitudinal direction and both side portions 30B disposed on both sides thereof. 6 shows a cross section taken along the line VI-VI of the central part 30A in FIG. 5, and FIG. 7 shows a cross section taken along the line VII-VII of the both side parts 30B in FIG.

  As shown in FIG. 6, a convex-shaped bead 40 is formed on the formation surface of the front face plate portion 32 of the central portion 30A. That is, the formation surface of the front face plate portion 32 is configured as a bead surface shape in which the central portion in the width direction has a convex shape 40 as viewed in the figure, and the surface rigidity is enhanced. On the other hand, as shown in FIG. 7, the shape configuration of the formation surface of the front face plate portion 32 in both side portions 30B is configured as a planar shape, and is not configured as a convex bead surface shape. Due to the difference in shape between the central portion 30A and the side portions 30B, the rigidity of the reinforcing member 30 in the direction in which the collision load is input is stronger in the central portion 30A than in the side portions 30B. In the present embodiment, the formation surfaces orthogonal to the longitudinal direction with respect to the direction in which the collision load F is input on the formation surface of the quadrangular section forming the reinforcing member 30 are the front face plate portion 32 and the rear face plate portion 34. In the present embodiment, the central portion 30A on the formation surface has a bead surface shape. In the present embodiment, the front face plate portion 32 forming the bead surface shape is the foremost forming surface in the direction in which the collision load is input on the quadrangular forming surface forming the reinforcing member 30.

  In the reinforcing member 30 of this embodiment, the formation width Y of the central portion 30A and the side portions 30B is different as shown in FIGS. That is, the formation width Y1 of the central portion 30A shown in FIG. 6 is formed wide, whereas the formation width Y2 of the side portions 30B shown in FIG. 7 is formed narrow. That is, it is set as Y1> Y2. As described above, the reinforcing member 30 is configured such that the central portion 30A is set to be relatively wider than the both side portions 30B, and the rigidity is relatively strong. Due to the difference in width configuration between the central portion 30A and the both side portions 30B, the rigidity of the reinforcing member 30 in the direction in which the collision load F is input is stronger in the central portion 30A than in the both side portions 30B.

  In this embodiment, the shape change from the wide formation width Y1 of the central portion 30A to the narrow formation width Y2 of the both side portions 30B is changed so as to be gradually narrowed in the range of the both side portions 30B. However, it may be formed in a step-like manner at the boundary between the central portion 30A and the side portions 30B, but such a configuration is not preferable because stress concentration tends to occur at the step-like formation portion.

  The bumper reinforcement 14 of the present embodiment is formed by the main body member 20 and the reinforcing member 30 as described above. In particular, since the central portion 30A of the reinforcing member 30 is formed to be more rigid than the both side portions 30B, the stress concentration due to the collision load input to the bumper reinforcement 14 is increased in the central portion of the reinforcing member 30 formed with high rigidity. Occurs in position. As a result, as shown in FIG. 8, the buckling phenomenon of the bumper reinforcement 14 due to the collision load F occurs at the center position. Even if there is a slight difference in the support strength of the bumper support structure 18 at both ends of the bumper reinforcement 14, this buckling phenomenon is surely performed at the center position by the shape configuration of the reinforcing member 30 described above in the present embodiment. Thereby, the collision load can be effectively received in a balanced manner at the left and right positions of the bumper reinforcement 14. For this reason, as pointed out as a conventional problem, the welded portion does not peel and the load of the bumper reinforcement 14 does not decrease.

  FIG. 9 shows an example of a buckled state of the bumper reinforcement 14 pointed out as a conventional problem. This example is a case where the stress concentration location due to the collision load is shifted to the left as viewed in the figure from the center position, peeling of the weld location occurs, and the load of the bumper reinforcement 14 is reduced.

  FIG. 10 is a characteristic diagram of the load and displacement of the bumper reinforcement 14 in this embodiment described above. In addition, the shape structure of the reinforcement member 30 of this embodiment of a characteristic diagram is a case provided with both a bead surface shape and a wide structure. In the diagram, the solid line is the case of the present embodiment, and the broken line is the case of the conventional configuration. As shown by the broken line, in the conventional case, when the welded part peels and breaks, the load decreases at a stretch. On the other hand, in the case of the present embodiment indicated by the solid line, the load can be received in a certain displacement range thereafter. This is a feature of this embodiment.

  While specific embodiments of the present invention have been described above, the present invention can be implemented in various other forms.

  For example, in the above-described embodiment, the case where the bead having a bead surface shape is the convex shape 40 has been described, but a concave shape may be used. However, in the arrangement form of the reinforcing member 30 in the present embodiment, the bead surface shape of the convex shape 40 has an advantage that the rigidity of the bead surface shape is enhanced.

  Moreover, in the above-mentioned embodiment, although the bead surface shape was set to the front surface board site | part 32, you may set to the rear surface board site | part 34. FIG. Further, both the parts 32 and 34 may be set.

  Moreover, in embodiment mentioned above, although it was embodiment which set together the structure which makes the bead surface shape and wide structure as a strong shape structure of the center part in the reinforcement member 30, it can also set independently, respectively.

  Further, in the above-described embodiment, the reinforcing member 30 is disposed between the positions where the crash box is disposed. However, the reinforcing member 30 may be disposed between the positions where the crash box is disposed.

  In the above-described embodiment, the joining means between the main body member 20 and the reinforcing member 30 is welding. However, mechanical joining means such as a rivet may be used.

  In the embodiment described above, the welding is spot welding, but arc welding, laser welding, or other welding means may be used.

  In the embodiment described above, the material of the main body member 20 and the reinforcing member 30 is made of a steel plate. However, the material is not limited to a steel plate as long as it is a rigid material.

10 Bumper Structure 12 Auto Body 14 Bumper Reinforcement 16 Bumper Covering Member 18 Bumper Support Structure (Crash Box)
20 Main body member 22 Main member 22A Rear side plate portion 22B Upper side plate portion 22C Lower side plate portion 22D Upper flange portion 22E Lower flange portion 24 Planar plate member 30 Reinforcing member 32 Front face plate portion 34 Rear face plate portion 36 Upper face plate portion 36A Upper front face plate part 36B Upper rear face plate part 38 Lower face plate part 38A Lower front face plate part 38B Lower rear face plate part 40 Convex shape W1-W6 Welding

Claims (6)

A long-shaped main body member disposed in the vehicle width direction includes a main body member having a hat-shaped cross section, and the main body member disposed on the opening side of the main body member so as to close the opening of the main body member. Is formed of a planar plate member having a closed cross-sectional shape, and a reinforcing member having a quadrangular cross-section is disposed inside a central portion in the longitudinal direction of the main body member having the closed cross-sectional shape. Bumper reinforcement arranged to be on the input side,
Bumper reinforcement in which the rigidity of the reinforcing member with respect to the direction in which the collision load is input is stronger than that of both side parts of the reinforcing member that are connected to both sides of the central part in the longitudinal direction. The bumper reinforcement according to claim 1,
The shape of the reinforcing member having a rigid central portion is such that the forming surface perpendicular to the longitudinal direction with respect to the direction in which the collision load is input on the forming surface of the quadrangular section forming the reinforcing member is convex or concave. Bumper reinforcement that is considered to be a bead surface shape. The bumper reinforcement according to claim 1,
The shape of the central portion of the reinforcing member having a strong rigidity is such that the formation width of the forming surface perpendicular to the longitudinal direction with respect to the direction in which the collision load is input on the forming surface of the quadrangular section forming the reinforcing member is the central portion. Bumper reinforcement that is wider than the two sides. The bumper reinforcement according to claim 1,
In the reinforcing member having a rigid shape at the central portion, the forming surface perpendicular to the longitudinal direction with respect to the direction in which the collision load is input on the forming surface of the quadrangular section forming the reinforcing member is convex or concave. The formation width of the formation surface orthogonal to the longitudinal direction with respect to the direction in which the collision load is input on the formation surface of the quadrangular cross-section forming the reinforcing member is formed in the bead surface shape. Wide bumper reinforcement. Bumper reinforcement according to claim 2 or claim 4,
The bead surface shape bead is a bumper reinforcement having a convex shape. The bumper reinforcement according to claim 5,
The reinforcing member forming surface forming the bead is a bumper reinforcement that is a forming surface on the forefront in a direction in which a collision load is input on the forming surface having a quadrangular cross section.

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