JP2008189137A - Vehicle body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body structure capable of suppressing load for supporting a pillar from being reduced by deformation of a gusset. <P>SOLUTION: The gusset 10 is provided with a body part 22 in which a cross section is formed in a U shape; a pillar joint part 24 joined to a pillar inner panel 20 at an end of an outer side in a vehicle width direction of the body part 22; and a cross member joint part 26 joined to a cross member at an end of an inner side in a vehicle width direction of the body part 22. At the inside of the body part 22, a gusset reinforcement 40 having a U shape cross section is joined along a vehicle width direction at a position left from the pillar joint part 24 and the cross member joint part 26. In the gusset 10, a high rigidity part is formed by the gusset reinforcement 40 joined to the body part 22, and fragile parts 44 are formed on two portions at both sides in a vehicle width direction of the gusset reinforcement 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle body structure considering side collision.

In Patent Document 1 below, a gusset portion that protrudes in a slope shape and extends over the corner portion of the side sill inner and the floor panel is extended to the lower portion of the center pillar, and the attachment portion of the gusset portion is fastened and fixed to the vertical surface of the side sill inner. And the structure which fastened and fixed the edge part of the cross member to the gusset part is disclosed.
JP-A-8-175425

  However, in the case of the above prior art, when the center pillar and the side sill inner are greatly deformed, a bending moment is applied to the gusset portion via the fastening portion with the vertical surface of the side sill inner and the gusset slope surface, and the gusset portion is bent. There is a possibility of deformation. For this reason, the load supporting the center pillar cannot be maintained, and the deformation may further increase.

  In view of the above facts, the present invention has an object to obtain a vehicle body structure that can suppress a decrease in the load that supports the pillar due to the deformation of the gusset, and thus can sustain the load that supports the pillar.

  According to a first aspect of the present invention, there is provided a cross member extending along a vehicle width direction on a vehicle body floor, a pillar erected on a longitudinal end side of the cross member, and a longitudinal end of the cross member. A gusset spanned between an upper surface portion on the part side and a lower portion of the pillar, the pillar structure coupled to the pillar and the cross member coupled to the pillar of the gusset A high-rigidity portion is provided along the vehicle width direction between the cross-member coupling portion and the cross-member coupling portion and the high-rigidity portion between the pillar coupling portion and the high-rigidity portion in the vehicle width direction. It is characterized in that weak parts are provided in two places between the two.

  According to a second aspect of the present invention, in the vehicle body structure according to the first aspect, the gusset is formed in an open cross-sectional shape in which a vehicle lower side is opened, and is arranged so as to cover an upper surface portion of the cross member. The high-rigidity portion is provided on the upper surface portion side.

  According to a third aspect of the present invention, in the vehicle body structure according to the first or second aspect, the high-rigidity portion is a reinforcing member coupled to the gusset.

  According to a fourth aspect of the present invention, in the vehicle body structure according to the first or second aspect, the high-rigidity portion is a reinforcing bead formed on the gusset, and at least one of the fragile portions is a crash formed on the gusset. It is characterized by being a bead.

  According to a fifth aspect of the present invention, in the vehicle body structure according to any one of the first to fourth aspects, the gusset is closer to the cross member coupling portion than the fragile portion with respect to the high-rigidity portion. A connecting portion for connecting the vehicle seat is provided.

  According to the first aspect of the present invention, when a collision load at the time of a side collision is input to the lower part of the pillar, the lower part of the pillar tends to fall inward in the vehicle width direction. However, since the gusset is stretched between the lower part of the pillar and the upper surface of the cross member, the collision load at the time of a side collision is input to the cross member coupling portion of the gusset via the gusset and then applied to the cross member. Communicated.

  Here, in the present invention, a highly rigid portion is provided along the vehicle width direction between the pillar coupling portion and the cross member coupling portion of the gusset, and between the pillar coupling portion and the high rigidity portion in the vehicle width direction and the cross Since the weak parts are provided in two places between the member coupling part and the high rigidity part, when the impact load at the time of a side collision is input to the pillar, the two weak parts of the gusset are deformed first, Can suppress the bending moment. After the fragile portion is deformed, the high-rigidity portion of the gusset forms a load transmission path, and the collision load is transmitted to the cross member via the high-rigidity portion. Therefore, it can suppress that the load which supports a pillar by deform | transforming in the direction which a gusset bends etc. can maintain the load which supports a pillar. As a result, the falling of the pillar inward in the vehicle width direction can be suppressed.

  According to the second aspect of the present invention, the gusset is formed in an open cross-sectional shape in which the vehicle lower side is opened, and is disposed so as to cover the upper surface portion of the cross member. Therefore, the load transmission path by the high rigidity portion is formed on the upper surface portion side of the gusset. For this reason, it becomes possible to transmit the collision load further upward to the joint (bending start point) where the rocker and the pillar provided at the corner of the pillar and the cross member are joined, and the pillar collapses. Can be further suppressed. Further, the gusset has an open cross-sectional shape with the vehicle lower side open, and is disposed so as to cover the upper surface of the cross member, so that the gusset and the cross member can be easily coupled.

  According to the third aspect of the present invention, since the high-rigidity portion is a reinforcing member coupled to the gusset, the position of the high-rigidity portion, that is, the connection position of the reinforcing member can be easily adjusted. Moreover, a high rigidity part and the weak part of the both sides of the high rigidity part of the vehicle width direction can be provided only by adding a reinforcing member to a gusset.

  According to the fourth aspect of the present invention, the high-rigidity portion is a reinforcing bead formed in the gusset, and at least one of the fragile portions is a crash bead formed in the gusset. It is not necessary to set the part as a separate part (that is, the number of parts does not increase), and the weight of the gusset can be reduced.

  According to the fifth aspect of the present invention, since the gusset includes the connecting portion that connects the vehicle seat to the cross member connecting portion side of the high-rigidity portion relative to the fragile portion. The fragile part of the gusset can be deformed at a place where no load is applied. Further, the vehicle seat can be connected to the cross member via the gusset, and there is no need to separately provide a connecting member for connecting the vehicle seat.

  As described above, the vehicle body structure according to the first aspect of the present invention has an excellent effect that the load supporting the pillar is prevented from being lowered by the gusset, and the load supporting the pillar can be maintained. Furthermore, the collapse of the pillar inward in the vehicle width direction can be suppressed.

  The vehicle body structure according to the second aspect of the present invention is capable of transmitting a collision load at a higher position with respect to the coupling portion between the pillar and the rocker, and is capable of further suppressing the collapse of the pillar. Have

  The vehicle body structure according to the third aspect of the present invention has an excellent effect that it is only necessary to add a reinforcing member to the gusset and the adjustment of the connecting position of the reinforcing member is easy.

  The vehicle body structure according to the fourth aspect of the present invention has an excellent effect that the structure can be simplified and the gusset can be reduced in weight.

  The vehicle body structure according to the fifth aspect of the present invention has an excellent effect that it is not necessary to separately provide a connecting member for connecting the vehicle seat to the cross member, and the cost can be reduced.

  [First Embodiment]

  Hereinafter, a first embodiment of a vehicle body structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 shows an overall perspective view of the assembled state of the gusset 10. FIG. 2 is a longitudinal sectional view taken along line 2-2 of FIG. As shown in these drawings, a cross member 14 extending along the vehicle width direction is disposed at a predetermined position in the vehicle longitudinal direction of the vehicle body floor 12. The cross member 14 is formed in a cross-sectional hat shape, and a pair of lower front and rear flange portions 14A are spot welded to the upper surface of the vehicle body floor 12, thereby forming a closed cross section with the vehicle body floor 12. Yes.

  A rocker inner panel 16 is extended on both sides of the vehicle body floor 12 along the vehicle front-rear direction. The rocker inner panel 16 is formed in a hat shape in cross section, and is arranged so that the opening side faces outward in the vehicle width direction. A terminal portion 12A of the vehicle body floor 12 is spot welded to the lower portion of the side wall portion 16A of the rocker inner panel 16. Further, an outer flange portion 14C and an outer mounting portion 14E formed at the end portion 15 in the longitudinal direction of the cross member 14 are spot welded to the side wall portion 16A and the upper surface portion 16B of the rocker inner panel 16. A rocker outer panel having the same shape is disposed outside the rocker inner panel 16 in the vehicle width direction, and the upper and lower flange portions 16C are spot welded to form a rocker having a closed cross-sectional structure. ing.

  Further, on the outside of the rocker inner panel 16 in the vehicle width direction and on the extension of the cross member 14, a pillar inner panel 20 of the center pillar 18 is erected substantially along the vehicle vertical direction. The gusset 10 is slanted between the lower portion of the pillar inner panel 20 of the center pillar 18 and the end portion 15 side in the longitudinal direction of the upper surface portion 14D of the cross member 14.

  The shape and structure of the gusset 10 will be specifically described. As shown in FIGS. 1 to 3 and the like, the gusset 10 is formed in a U-shaped cross section by a top wall portion 22A and a pair of front and rear side wall portions 22B. The main body portion 22, the flange-shaped pillar joint portion 24 that is integrally formed at the outer end of the main body portion 22 in the vehicle width direction and serves as a joint surface to the pillar inner panel 20, and the front end portion of the main body portion 22 A cross member joint portion 26 for bolt joining formed in a U-shape (on the inner side in the vehicle width direction), and a flange portion 28 formed on the lower edge side of the main body portion 22 in the vehicle front-rear direction. ing. Between the top wall portion 22A of the main body portion 22 and the cross member joint portion 26, a step portion 30 that is bent downward from the top wall portion 22A is formed.

  Inside the main body 22, a gusset is formed between the pillar joint 24 and the cross member joint 26 and at a position separated from the pillar joint 24 and the cross member joint 26 along the vehicle width direction. Reinforce 40 is joined. The gusset reinforcement 40 is formed in a U-shape shallower than the gusset 10 by the top wall portion 40A and the pair of front and rear side wall portions 40B. The top wall portion 40A and the side wall portion 40B of the gusset reinforcement 40 are fitted so as to come into contact with the top wall portion 22A and the side wall portion 22B of the gusset 10, and the pair of front and rear side wall portions 40B are paired with the front and rear of the gusset 10 by spot welding 42. Are joined to the side wall portion 22B. In the present embodiment, the high-rigidity portion is configured by the gusset reinforcement 40 joined to the main body portion 22 of the gusset 10. Further, the gusset 10 is provided with weak portions 44 on both sides of the gusset reinforcement 40, that is, between the gusset reinforcement 40 and the pillar joint portion 24 and between the gusset reinforcement 40 and the cross member joint portion 26. .

  The distance between the opposed surfaces of the pair of front and rear side wall portions 26A of the cross member joint portion 26 of the gusset 10 is substantially equal to the front and rear width of the upper surface portion 14D of the cross member 14, and the cross member joint portion 26 of the gusset 10 is connected to the cross member. 14 is configured to be fitted from above. That is, the cross member joining portion 26 of the gusset 10 is disposed so as to cover the upper surface portion 14D and the side wall portion 14B of the cross member 14.

  Further, a pair of front and rear bolt insertion holes 32 penetrating in the vehicle width direction is formed in the upper portion of the pillar joint portion 24. Further, a bolt insertion hole 34 penetrating in the vehicle vertical direction is formed in the upper surface portion of the U-shaped cross member joint portion 26, and a bolt insertion penetrating in the vehicle longitudinal direction is formed in a pair of front and rear side walls of the cross member joint portion 26. A hole 36 is formed.

  The pillar joint portion 24 of the gusset 10 is disposed in contact with the lower portion of the pillar inner panel 20 and is fastened and fixed by a bolt 50 and a weld nut 52. Further, the cross member joint portion 26 of the gusset 10 is disposed in contact with the upper surface portion 14D and the side wall portion 14B of the cross member 14, and is fastened and fixed by a bolt 54 and a weld nut 56. Accordingly, the lower portion of the center pillar 18 and the longitudinal end portion 15 of the cross member 14 are coupled to each other in an oblique direction via the gusset 10.

  (Operation and effect of this embodiment)

  Next, the operation and effect of this embodiment will be described.

  As shown in FIG. 4, when a collision load at the time of a side collision is input to the lower part of the center pillar 18, the lower part of the center pillar 18 tends to fall inward in the vehicle width direction (arrow A direction side). Since the lower portion of the center pillar 18 is connected to the longitudinal end portion 15 of the cross member 14 via the gusset 10, the collision load is input to the gusset 10 from the fastening portion of the bolt 50, and the top wall of the main body portion 22. It passes through the part 22A (mainly the ridge line) and is input from the cross member joint part 26 to the fastening part of the bolt 54.

  Here, in this embodiment, the gusset reinforcement 40 as a highly rigid part is joined to the lower part of the main-body part 22 of the gusset 10 along the vehicle width direction, and the two weak parts 44 are provided on both sides of the gusset reinforcement 40 in the vehicle width direction. Therefore, the two weak portions 44 of the gusset 10 are first deformed by being pushed by the pillar inner panel 20 of the center pillar 18, and the bending moment from the center pillar 18 can be suppressed. After the fragile portion 44 is deformed, the portion (high-rigidity portion) where the gusset reinforcement 40 of the gusset 10 is joined forms a load transmission path, and the collision load causes the high-rigidity portion as shown by the arrow F in FIG. Via the cross member 14. Therefore, it is possible to suppress a decrease in load due to deformation of the gusset 10 in a bending direction and the load supporting the center pillar 18 can be maintained. As a result, the center pillar 18 can be prevented from collapsing inward in the vehicle width direction.

  On the other hand, FIGS. 5 and 6 show a configuration in which gusset reinforcement is not joined to the gusset 100 (the gusset 100 is not provided with a high-rigidity portion and weak portions on both sides in the vehicle width direction). In this configuration, when a heavy automobile collides with the side, if the collision load is input to the lower part of the center pillar 18, the lower part of the center pillar 18 tends to fall inward in the vehicle width direction, as shown in FIG. There is a possibility that the gusset 100 is deformed in a bending direction at the center in the vehicle width direction due to the bending moment. Further, as shown in FIG. 6, a collision load is input to the cross member 14 via the gusset 10, and there is a possibility that a portion near the position where the gusset 10 of the cross member 14 is connected is deformed. That is, in the configuration of the proportionality 1, since an excessive moment acts on the cross member 14, the cross member 14 needs to be reinforced. Even if the cross member 14 is reinforced, if the gusset 100 is deformed in a bending direction due to a bending moment, the collision load is not transmitted.

  As shown in FIG. 7, in the configuration of the comparative 1 (see FIG. 5 or FIG. 6), when the deformation stroke of the center pillar 18 increases, the moment is transmitted accordingly, so that the gusset 100 and the cross member 14 Deformation and sudden load drop occurs. On the other hand, in this embodiment, when the stroke of the center pillar 18 increases, the two weak parts 44 of the gusset 10 are deformed first and the load is sustained, so that the EA amount (energy absorption amount) increases.

  On the other hand, in the configuration in which the fragile portion 44 is provided only at one location on the cross member 14 side, the center pillar 18 falls down and changes in angle with respect to the gusset, but there is no fragile portion on the center pillar 18 side, so Is transmitted almost as it is. On the other hand, in the present embodiment, the fragile portions 44 are provided in two locations on the center pillar 18 side and the cross member 14 side of the gusset 10 to reduce the moment transmitted from the center pillar 18 side to the cross member 14. Can do.

  Moreover, in this embodiment, since the gusset reinforcement 40 is joined so that it may contact | abut to the top wall part 22A of the gusset 10, and the inner wall of the side wall part 22B, the load transmission path by the gusset reinforcement 40 is formed in the upper side of the gusset 10. Is done. For this reason, it becomes possible to transmit a collision load further upward to the joint portion (bending start point) where the center pillar 18 and the rocker inner panel 16 are joined, and the collapse of the center pillar 18 can be suppressed. Further, the gusset 10 and the cross member 14 can be easily coupled by arranging the gusset 10 so as to have a U-shaped cross-sectional shape with the vehicle lower side open and covering the upper surface portion 14D of the cross member 14. .

  Moreover, since the gusset reinforcement 40 is joined to the inner wall of the side wall 22B of the gusset 10 by spot welding 42, the position of the high-rigidity portion (joint position of the gusset reinforcement 40) can be easily adjusted. Moreover, a high rigidity part and the weak part of the both sides of the vehicle width direction can be provided only by adding the gusset reinforcement 40 to the gusset 10, and manufacture is easy.

  [Second Embodiment]

  Hereinafter, a second embodiment of the vehicle body structure according to the present invention will be described with reference to FIGS. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 8 to 9, in the second embodiment, the cross member joint 62 of the gusset 60 extends inward in the vehicle width direction, and the bolt insertion hole 34 of the cross member joint 62 and the vehicle A concave seat connecting portion 64 for connecting a rail portion (not shown) of the vehicle seat is provided between the weak portion 44 on the inner side in the width direction. The seat connecting portion 64 is formed with a bolt insertion hole 66 penetrating in the vehicle vertical direction, and the rail portion of the vehicle seat is fastened and fixed to the cross member 14 via the seat connecting portion 64 of the gusset 60. It has become.

  A bead 70 is formed at the center of the gusset reinforcement 68 joined to the main body 22 of the gusset 60 so as to protrude downward along the vehicle width direction. In the present embodiment, the bead 70 is provided only on the gusset reinforcement 68, but the configuration is not limited thereto, and the bead is formed only on the gusset, or the bead is formed on both the gusset and the gusset reinforcement 68. Good.

  (Action / Effect)

  When a collision load at the time of a side collision is input to the lower portion of the center pillar 18 (see FIG. 1), the collision load is transmitted to the bolt fastening portion of the cross member joint portion 62 via the main body portion 22 of the gusset 60. As a result, as shown in FIG. 9, the two weak portions 44 of the gusset 60 are first deformed by being pushed by the pillar inner panel 20 (see FIG. 1) of the center pillar 18, and the bending moment from the center pillar 18 is thereby deformed. Can be suppressed. After the fragile portion 44 is deformed, a portion (high rigidity portion) where the gusset reinforcement 68 of the gusset 60 is joined forms a load transmission path, and a collision load is applied to the cross member 14 (see FIG. 1) via the high rigidity portion. Communicated. Therefore, according to the present embodiment, similarly to the first embodiment described above, it is possible to suppress a decrease in load due to deformation of the gusset 60 in a bending direction, and to maintain the load that supports the center pillar 18. As a result, the center pillar 18 can be prevented from collapsing inward in the vehicle width direction. Further, by providing the bead 70 on the gusset reinforcement 68, the deformation of the gusset reinforcement 40 can be further suppressed.

  In the present embodiment, since the seat connecting portion 64 is provided between the bolt insertion hole 34 of the cross member joint portion 62 of the gusset 60 and the weak portion 44 on the inner side in the vehicle width direction, the load on the vehicle seat It is possible to deform the fragile portion 44 of the gusset 60 at a location where no entrapped. Further, the vehicle seat can be connected to the cross member 14 via the gusset 60, and there is no need to separately provide a connecting member for connecting the vehicle seat.

  On the other hand, in FIG. 10 and FIG. 11, as a comparison 2, a cross member joint 112 is extended inside the gusset 110 in the vehicle width direction and is adjacent to the pillar joint 24 outside the gusset 110 in the vehicle width direction. A configuration in which a high-rigidity portion 114 having a concave cross-sectional shape along the vehicle width direction is provided at the position is shown. Further, a bolt insertion hole 116 penetrating in the vehicle vertical direction is formed in the cross member joining portion 112 between the high rigidity portion 114 and the bolt insertion hole 34. The gusset 110 is fastened and fixed to the cross member 14 by bolt insertion holes 34, 36 and 116. In this gusset 110, the inside of the highly rigid portion 114 in the vehicle width direction is the weakened portion 118, and no weak portion is provided on the center pillar 18 side.

  In this configuration of proportionality 2, when a collision load at the time of a side collision is input to the lower part of the center pillar 18 (see FIG. 1), the gusset 110 bends downward at the fragile portion 118 due to a bending moment acting on the gusset 110. Deform in the direction. That is, since the high-rigidity portion 114 of the gusset 110 is aligned with the center pillar 18, the center pillar 18 side of the gusset 110 is not deformed, and the load is concentrated on the fragile portion 118 and the gusset 110 is bent. As FIG. 12 shows, the load after that falls by deform | transforming in the direction which the gusset 110 bends in the vicinity of the arrow B. As shown in FIG. Further, as shown in FIG. 13, since the moment increases as the load increases, the deformation of the gusset 110 starts near the position where the moment becomes maximum, and the gusset 110 bends.

  On the other hand, in this embodiment, as shown in FIG. 12, since the two weak parts 44 of the gusset 60 are deformed first, a high load continues. Further, as shown in FIG. 13, even when the load increases, the moment remains low.

  [Third Embodiment]

  Hereinafter, a third embodiment of the vehicle body structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment and 2nd Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 14, in the third embodiment, the top wall portion 22 </ b> A of the main body portion 22 of the gusset 80 is cross-sectioned along the vehicle width direction at a position away from the pillar joint portion 24 and the cross member joint portion 26. A reinforcing bead 82 having a concave shape is formed. Between the pillar joint portion 24 and the reinforcement bead 82 in the vehicle width direction, a crash bead 84 is formed on both sides in the vehicle front-rear direction, in which corners (ridges) of the main body portion 22 are recessed in a substantially V shape in the vehicle width direction. Has been. In this gusset 80, the reinforcing bead 82 is a highly rigid portion, the crash bead 84 is a weak portion, and a weak portion 86 is provided between the reinforcing bead 82 and the cross member joint portion 26 in the vehicle width direction. The gusset 80 is not joined with gusset reinforcement.

  (Action / Effect)

  When a collision load at the time of a side collision is input to the lower part of the center pillar 18 (see FIG. 1), the collision load is transmitted to the bolt fastening portion of the cross member joint portion 26 through the main body portion 22 of the gusset 80. This is the same as in the first embodiment described above. As a result, the two crush beads 84 and the fragile portion 86 of the gusset 80 are deformed first by being pushed by the pillar inner panel 20 (see FIG. 1) of the center pillar 18, and the bending moment from the center pillar 18 can be suppressed. In the present embodiment, since the high-rigidity portion is formed only by the reinforcing bead 82 without using the gusset reinforcement, the crash bead 84 that induces deformation is provided on the center pillar 18 side of the gusset 80, and the crash bead 84 is actively used. Deform. After the crash bead 84 and the fragile portion 86 are deformed, the portion of the gusset 80 in which the reinforcing bead 82 is formed (high rigidity portion) forms a load transmission path, and the collision load passes through the high rigidity portion to the cross member 14 ( 1). Therefore, according to this embodiment, similarly to the first embodiment described above, it is possible to suppress a decrease in load due to deformation of the gusset 80 in a bending direction, and to maintain a load that supports the center pillar 18. As a result, the center pillar 18 can be prevented from collapsing inward in the vehicle width direction.

  Moreover, in this embodiment, since the highly rigid part of the gusset 80 and the weak part of the both sides in the vehicle width direction are comprised by one component, while being able to reduce the weight of the gusset 80, material cost can be reduced. Also, the gusset 80 can be easily assembled.

  [Supplementary explanation of the embodiment]

  In each of the above-described embodiments, the gussets 10, 60, and 80 are used for connecting the center pillar 18 and the cross member 14, but not limited thereto, the gusset structure of the present invention is used for connecting other pillars and the cross member. You may apply.

  In the first and second embodiments described above, the gusset reinforcements 40 and 68 are joined to the inner walls of the gussets 10 and 60. However, the gusset reinforcements may be joined to the outer walls of the gussets 10 and 60.

  In the first and second embodiments described above, the gusset reinforcements 40 and 68 are joined to the gussets 10 and 60. Further, in the third embodiment described above, the reinforcement beads 82 and the crash beads 84 are provided on the gussets 80. Although it formed, not only this structure but the structure which provides a highly rigid part and a weak part actively in a gusset, or the structure which provides a relatively highly rigid part and a weak part can be set. For example, as a configuration in which a relatively high rigidity portion and a fragile portion are provided, a configuration in which a hole or a thin portion is formed in the gusset may be used as the fragile portion.

1 is a perspective view showing an overall configuration of a vehicle body structure according to a first embodiment. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a perspective view which expands and shows the single item structure of the gusset shown in FIG. 1, and a gusset reinforcement. It is a longitudinal cross-sectional view corresponding to FIG. 2 which shows the deformation | transformation mode at the time of a side collision. It is a longitudinal cross-sectional view which shows an example of the deformation | transformation mode at the time of the side collision in the vehicle body structure of contrast 1. It is a longitudinal cross-sectional view which shows the other example of the deformation | transformation mode at the time of the side collision in the vehicle body structure of contrast 1. It is a graph which shows the relationship between the load of a gusset and the stroke of a center pillar in the vehicle body structure of contrast 1 with 1st Embodiment. It is a perspective view which expands and shows the single goods structure of the gusset used for the vehicle body structure which concerns on 2nd Embodiment, and a gusset reinforcement. It is a longitudinal cross-sectional view which shows the deformation | transformation mode at the time of the side collision of the gusset shown in FIG. 8, and a gusset reinforcement. It is a perspective view which expands and shows the singular structure of the gusset and gusset reinforcement used for the vehicle body structure of contrast 2. It is a longitudinal cross-sectional view which shows the deformation | transformation mode at the time of the side collision of the gusset shown in FIG. 10, and a gusset reinforcement. It is a graph which shows the relationship between the load of a gusset and time in the vehicle body structure of contrast 2 with 2nd Embodiment. It is a graph which shows the relationship between the moment in the body structure of contrast 2 with 2nd Embodiment, and time. It is a perspective view which expands and shows the single item structure of the gusset used for the vehicle body structure which concerns on 3rd Embodiment.

Explanation of symbols

10 Gusset 12 Body floor 14 Cross member 14D Upper surface portion 15 End portion 18 in the longitudinal direction Center pillar (pillar)
20 Pillar inner panel (pillar)
22 Main body 22A Top wall (upper surface)
24 Pillar joint (pillar joint)
26 Cross member joint (cross member joint)
40 Gusset reinforcement (highly rigid part, reinforcing member)
44 weak part 60 gusset 62 cross member joint part (cross member joint part)
64 Sheet connection part (connection part)
68 Gusset reinforcement (high rigidity part, reinforcement member)
80 Gusset 82 Reinforcement bead (High rigidity part)
84 Crash Bead (Vulnerable part)
86 Vulnerable parts

Claims (5)

A cross member extending along the vehicle width direction on the vehicle body floor;
Pillars erected on the end of the cross member in the longitudinal direction;
A gusset spanned between the upper surface portion on the end side in the longitudinal direction of the cross member and the lower portion of the pillar;
A vehicle body structure including
A highly rigid portion is provided along the vehicle width direction between a pillar coupling portion coupled to the pillar of the gusset and a cross member coupling portion coupled to the cross member,
Fragile portions were provided at two locations between the pillar coupling portion and the high-rigidity portion in the vehicle width direction and between the cross member coupling portion and the high-rigidity portion,
Body structure characterized by that. The gusset is formed in an open cross-sectional shape with the vehicle lower side open, and is disposed so as to cover the upper surface of the cross member.
The high rigidity portion is provided on the upper surface portion side of the gusset.
The vehicle body structure according to claim 1.   The vehicle body structure according to claim 1 or 2, wherein the high-rigidity portion is a reinforcing member coupled to the gusset. The high-rigidity part is a reinforcing bead formed on the gusset,
The vehicle body structure according to claim 1 or 2, wherein at least one of the fragile portions is a crush bead formed in the gusset.   5. The gusset includes a connecting portion that connects a vehicle seat to the cross-member connecting portion side of the fragile portion with respect to the high-rigidity portion. The vehicle body structure described in any one of the items.

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