JP2010202118A - Vehicle body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease the intrusion amount of a rocker into the interior side of a vehicular width direction at the time of lateral collision without using an additional reinforcement member. <P>SOLUTION: In this vehicle body structure, a vehicular seat is attached to a seat attachment bracket 32 which is connected with a floor panel 18 and the rocker 12 in a vehicle body 10. In general, the rocker 12 is twisted so that the upper part (a ridgeline L1) of the rocker 12 intrudes into the interior side of the vehicular width direction at the time of the lateral collision of a vehicle. However, in this vehicle body structure, the connection piece 35 of the seat attachment bracket 32 is connected with the upper surface of the rocker 12 thereby directly supporting the upper surface of the rocker 12 with the seat attachment bracket 32. Further, the upper wall 34 of the seat attachment bracket 32 is linearly formed in the longitudinal direction view of the vehicle body, and extends linearly toward the interior side of the vehicular width direction (the side on which the upper part of the rocker 12 intrudes) from the upper surface of the rocker 12, thereby exhibiting high rigidity against the load input from the upper part of the rocker 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body structure of an automobile, and more particularly to a vehicle body structure including a seat mounting bracket that is coupled to a floor panel and a rocker of a vehicle body and to which a vehicle seat is attached.

  2. Description of the Related Art Conventionally, in an automobile body structure, a structure in which a reinforcing member is disposed on the lower surface of a floor panel at a position below a seat mounting bracket is known (see, for example, Patent Document 1). The reinforcing member connects the rocker and the side member, thereby suppressing the amount of rocker entering the vehicle interior side (in the vehicle width direction) at the time of a side collision.

JP 2001-63620 A

  However, since the above-described vehicle body structure is configured to reinforce the vehicle body by newly adding a reinforcing member, there is a problem that the cost and weight of the vehicle body increase due to the addition of the reinforcing member.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to provide a vehicle body structure that can reduce the amount of rocker entering into the vehicle width direction inside a side collision without adding a reinforcing member.

  A vehicle body structure according to a first aspect of the present invention is a vehicle body structure having a seat mounting bracket coupled to a floor panel and a rocker of the vehicle body, and the seat mounting bracket is straight when viewed in the longitudinal direction of the vehicle body. The upper wall of the rocker is linearly extended inward in the vehicle width direction, and is provided at the upper wall to which the vehicle seat is connected and the outer end of the upper wall in the vehicle width direction. And a coupling piece coupled to the upper surface side of the rocker.

  In the vehicle body structure according to the first aspect, the vehicle seat is mounted on the seat mounting bracket coupled to the floor panel and the rocker of the vehicle body. Here, at the time of a side collision of an automobile, the rocker is generally twisted and the upper part of the rocker enters the inside in the vehicle width direction. In this vehicle body structure, the rocker is provided at the outer end in the vehicle width direction of the upper wall of the seat mounting bracket. Since the coupled piece is coupled to the upper surface side of the rocker, the upper portion of the rocker can be directly supported by the seat mounting bracket. Moreover, the upper wall of the seat mounting bracket is straight (straight) when viewed from the front and rear of the vehicle body, and is straight from the upper surface side of the rocker to the inner side in the vehicle width direction (the side where the upper portion of the rocker enters) Therefore, it exhibits high rigidity against the load input from the top of the rocker. Thereby, since the deformation | transformation of a rocker can be suppressed, the penetration | invasion amount of a rocker can be reduced, without adding a reinforcement member.

  According to a second aspect of the present invention, there is provided a vehicle body structure according to the first aspect, wherein the upper wall extends obliquely downward from the upper surface side of the rocker. Yes.

  In the vehicle body structure of the automobile according to claim 2, the upper wall of the seat mounting bracket is inclined downward from the upper surface side of the rocker toward the inner side in the vehicle width direction (that is, the displacement direction of the upper portion of the rocker when the rocker is twisted by a side collision) ). Thereby, since the displacement of the upper part of the rocker can be satisfactorily suppressed by the upper wall, the intrusion amount of the rocker can be effectively reduced.

  A vehicle body structure according to a third aspect of the present invention is the vehicle body structure according to the second aspect, wherein the upper wall is centered on the centroid of the rocker, and the upper surface side of the rocker and the coupling piece It extends along a tangent line at the joint part in a virtual circle passing through the joint part.

  In the vehicle body structure according to claim 3, the upper wall of the seat mounting bracket is along the tangent line (that is, the input direction of the load input from the rocker to the upper wall when the rocker is twisted around the centroid). It is extended. Thereby, since the said load can be favorably supported by the upper wall, the penetration | invasion amount of a rocker can be reduced more effectively.

  A vehicle body structure according to a fourth aspect of the present invention is the vehicle body structure according to any one of the first to third aspects, wherein the seat mounting bracket has an upper end integrated with the upper wall. A first side wall connected to the floor panel and an upper end integrally connected to the upper wall, and a lower end part connected to the floor panel and adjacent to the first side wall. It has a 2nd side wall and the connection means which connects the said 1st side wall and the said 2nd side wall by mechanical interference, It is characterized by the above-mentioned.

  In the vehicle body structure according to the fourth aspect, the first side wall and the second side wall of the seat mounting bracket are connected by mechanical interference. As a result, the rigidity of the seat mounting bracket against the load input from the vehicle seat can be improved. Further, when the seat mounting bracket is formed by bending a sheet metal, it is possible to prevent so-called spring back from occurring at each connection portion (bent portion) between the first side wall, the second side wall, and the upper wall.

  A vehicle body structure according to a fifth aspect of the present invention is the vehicle body structure of the fourth aspect of the present invention, wherein the connecting means extends from one of the first side wall and the second side wall, and A contact piece that contacts the other surface of the one side wall and the second side wall, and the other side of the contact piece when the one side is separated from the other centering on a connecting portion with the upper wall. It is characterized in that it is inclined with respect to the connecting portion so that a part thereof is arranged in the movement locus.

  In the vehicle body structure of the automobile according to claim 5, the contact piece extending from one of the first side wall and the second side wall of the seat mounting bracket contacts the other surface of the first side wall and the second side wall. Yes. The other side wall is inclined with respect to the connection part so that a part of the side wall is arranged in the movement locus of the contact piece when the one side wall is separated from the other wall with the connection part with the upper wall as a center. is doing. Therefore, the separation is prevented by the contact piece being caught by the part. Thereby, since a 1st side wall and a 2nd side wall can be connected, a connection means can be made a simple structure.

  As described above, in the vehicle body structure of the automobile according to the present invention, the amount of rocker entering the vehicle width direction inside at the time of a side collision can be reduced without adding a reinforcing member.

1 is a perspective view showing a partial configuration of a vehicle body configured by applying the vehicle body structure of an automobile according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a perspective view of the seat mounting bracket shown by FIG. It is sectional drawing corresponding to FIG. 2 which shows the partial structure of the vehicle body which concerns on the comparative example of 1st Embodiment of this invention. It is a CAE analysis result of a side collision, and is a longitudinal sectional view showing a deformed state of a vehicle body side part. It is a CAE analysis result at the time of a side collision, (A) is a perspective view which shows the deformation state of the vehicle body which concerns on a comparative example, (B) is a perspective view which shows the deformation state of the vehicle body which concerns on this 1st Embodiment. . It is a perspective view of the seat mounting bracket which is a structural member of the vehicle body structure of the motor vehicle based on 2nd Embodiment of this invention. It is the side view which looked at the seat mounting bracket shown by FIG. 7 from the vehicle width direction. FIG. 8 is a side view of the seat mounting bracket shown in FIG. 7 as viewed from the front-rear direction of the vehicle body. It is a longitudinal cross-sectional view which shows the partial structure of the seat mounting bracket shown by FIG. It is a perspective view which shows the modification of 2nd Embodiment of this invention.

<First Embodiment>
A vehicle body structure according to a first embodiment of the present invention will be described below with reference to FIGS. In the figure, the arrow Fr indicates the vehicle body front direction, the arrow Up indicates the vehicle body upward direction, and the arrow Rh indicates the vehicle body right direction.

  As shown in FIG. 1, in the vehicle body 10 according to the first embodiment, the rocker 12 is disposed at the lower part of both ends in the vehicle width direction (note that the illustration of the rocker 12 on the left side of the vehicle body is omitted in FIG. 1). is there). The rocker 12 extends along the longitudinal direction of the vehicle body and includes a rocker inner panel 14 and a rocker outer panel 15. As shown in FIG. 2, the rocker inner panel 14 and the rocker outer panel 15 are both formed in a hat shape in cross section, and constitute a closed cross section by connecting the upper and lower flange portions.

  As shown in FIG. 2, a B pillar outer panel 17 constituting the B pillar 16 of the vehicle body 10 is disposed outside the rocker outer panel 15 in the vehicle width direction (not shown in FIG. 1). The B pillar outer panel 17 is disposed in the vicinity of the center of the rocker 12 in the longitudinal direction of the vehicle body, and forms a closed section together with a B pillar inner panel (not shown). The B pillar outer panel 17 is coupled at its lower end to the lower end of the rocker outer panel 15.

  A front floor panel 18 constituting a floor portion of the passenger compartment is provided inside the rocker inner panel 14 in the vehicle width direction. A floor tunnel portion 18A is provided in the center of the front floor panel 18 in the vehicle width direction, and flat general floor portions 18B are provided on both sides of the floor tunnel portion 18A in the vehicle width direction. A flange portion 20 is provided at an outer end portion of the floor general portion 18B in the vehicle width direction, and the flange portion 20 is coupled to the lower end side of the vertical wall 14A of the rocker inner panel 14.

  Further, as shown in FIG. 1, a front floor first cross member 22 is provided on the front end side of the floor general portion 18B. The front floor first cross member 22 has a lower end portion coupled to the upper surface of the floor general portion 18B, an outer end portion in the vehicle width direction coupled to the rocker inner panel 14, and an inner end portion in the vehicle width direction coupled to the floor tunnel portion 18A. Has been. Thus, the rocker 12 and the floor tunnel portion 18A are connected by the front floor first cross member 22. In addition, the vehicle body 10 according to the present embodiment has a configuration in which the front floor second cross member is omitted.

  Further, a pair of left and right seat rails 24 and 26 constituting a vehicle seat (not shown) are disposed above the floor general portion 18B along the vehicle body longitudinal direction. The seat rail 24 on the inner side in the vehicle width direction has a front end portion fixed to the upper wall of the front floor first cross member 22 and a rear end portion fixed to the floor panel 18 via a bracket 28.

  Further, the seat rail 26 disposed on the outer side in the vehicle width direction has a front end portion fixed to the upper wall of the front floor first cross member 22 and a rear end portion fixed to the seat rail attaching bracket 30. As shown in FIG. 2, the seat rail mounting bracket 30 extends from the rear end portion of the seat rail 26 toward the outer side in the vehicle width direction, and the outer end portion in the vehicle width direction is connected to the seat mounting bracket 32. Has been.

  The sheet mounting bracket 32 is formed by bending a sheet metal material, and includes an upper wall 34, an inner wall 36, a front wall 38, and a rear wall 40 as shown in FIG. . A flat plate-like coupling piece 35 is integrally provided at the outer end of the upper wall 34 in the vehicle width direction. As shown in FIG. 2, the coupling piece 35 is superposed on the upper surface of the upper wall 14B of the rocker inner panel 14 in the plate thickness direction, and is coupled to the upper wall 14B by spot welding.

  Further, the upper wall 34 of the seat mounting bracket 32 is formed in a flat plate shape and extends inward in the vehicle width direction from the coupling piece 35 in a state substantially parallel to the upper wall 14B of the rocker inner panel 14. . In the first embodiment, no bent portion is provided between the coupling piece 35 and the upper wall 34, and the coupling piece 35 and the upper wall 34 are arranged on the same plane. In the embodiment, a bent portion may be provided between the coupling piece 35 and the upper wall 34.

  A vehicle rail direction outer end portion of the seat rail attachment bracket 30 is in contact with the center portion of the upper surface of the upper wall 34, and a circular bolt for attaching the seat rail attachment bracket 30 to the center portion of the upper wall 34. A hole 42 (through hole) is formed. A bolt 44 that penetrates the outer end of the seat rail mounting bracket 30 in the vehicle width direction passes through the bolt hole 42. The bolt 44 is screwed into a nut 46 welded to the lower surface of the upper wall 34. Yes. Thus, the seat rail mounting bracket 30 is fastened to the upper wall 34 (seat mounting bracket 32).

  On the other hand, the inner wall 36 has an upper end integrally connected to the inner end in the vehicle width direction of the upper wall 34, and a flange portion 36A provided at the lower end is coupled to the upper surface of the floor general portion 18B by spot welding. Has been. Further, the front wall 38 is integrally connected at the upper end to the vehicle body front side end portion of the upper wall 34, and a flange portion 38A provided at the lower end portion is joined to the upper surface of the floor general portion 18B by spot welding. Yes. Further, the rear wall 40 has an upper end integrally connected to the vehicle body rear side end portion of the upper wall 34, and a flange portion 40A provided at the lower end portion is joined to the upper surface of the floor general portion 18B by spot welding. Yes.

  Flange portions 38 </ b> B and 40 </ b> B are provided at the outer end portions in the vehicle width direction of the front wall 38 and the rear wall 40, respectively. These flange portions 38B and 40B are coupled to the vertical wall 14A of the rocker inner panel 14 by spot welding.

  Further, flange portions 38 </ b> C and 40 </ b> C are provided at the vehicle width direction inner ends of the front wall 38 and the rear wall 40, respectively. These flange portions 38C and 40C are joined to the outer surface in the vehicle width direction of the inner wall 36 by spot welding. In FIG. 3, the portion marked with x is a spot welding spot.

  Here, in the first embodiment, as shown in FIG. 2, the upper wall 34 of the seat mounting bracket 32 is formed in a straight shape (straight shape) when viewed from the front-rear direction of the vehicle body. 12 is extended linearly in an obliquely downward direction from the upper surface of 12 toward the inner side in the vehicle width direction. Further, in the first embodiment, the upper wall 34 is centered on the centroid X of the rocker 12 and is at the joint S in the virtual circle C1 passing through the joint S between the upper surface of the rocker inner panel 14 and the joint piece 35. It extends along the tangent line.

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

  In the first embodiment, when a load F1 (see FIG. 2) directed inward in the vehicle width direction (vehicle interior side) is input to the B pillar 16 due to a side collision of the vehicle body 10, the upper portion of the rocker 12 A load F2 directed to the vehicle interior side is input to the side through the B pillar outer panel 17 and a B pillar inner panel (not shown). For this reason, the rocker 12 is twisted and the upper part of the rocker 12 enters into the vehicle width direction inside. In this case, generally, the ridge line L1 at the upper part of the rocker inner panel 14 is deformed the most, and the amount of the ridge line L1 entering the vehicle interior side is the largest, but in the first embodiment, the coupling piece of the seat mounting bracket 32 Since 35 is coupled to the upper surface of the upper wall 14B of the rocker inner panel 14, the upper portion of the rocker 12 is directly supported by the seat mounting bracket 32.

  Moreover, the upper wall 34 is formed in a straight shape when viewed from the front-rear direction of the vehicle body, and extends linearly from the coupling piece 35 toward the inner side in the vehicle width direction (the side into which the upper portion of the rocker 12 enters). Therefore, it exhibits high rigidity with respect to a load input from the upper part of the rocker 12. Thereby, since the amount of penetration of the ridge line L1 into the vehicle interior side can be reduced, the rocker 12 can be prevented from being twisted (rolled), and as a result, the amount of penetration of the B pillar 16 into the vehicle interior side is reduced. can do. Thereby, the penetration | invasion amount to the vehicle interior side of the rocker 12 can be reduced.

  That is, when the upper wall 102 is not linearly extended from the upper surface side of the rocker 12 as in the seat mounting bracket 100 (comparative example) shown in FIG. Can not support. For this reason, as shown by a two-dot chain line in FIG. 4, the rocker 12 is twisted (rolled) to increase the amount of intrusion of the B pillar 16 into the vehicle interior, resulting in the vehicle interior of the rocker 12. The amount of intrusion inside increases.

  In FIG. 5, the deformation state of the vehicle body at the time of a side collision is shown in a longitudinal sectional view by CAE analysis (Computer Aided Engineering). In FIG. 5, the deformation state of the vehicle body 10 according to the first embodiment is indicated by a solid line, and the deformation state of the vehicle body 106 according to the comparative example is indicated by a two-dot chain line. As can be seen from FIG. 5, in the vehicle body 10 according to the first embodiment, both the penetration amount of the B pillar and the penetration amount of the rocker are reduced compared to the vehicle body 106 according to the comparative example.

  FIG. 6 is a perspective view of the deformation amount (distortion amount) of the side part of the vehicle body at 50 ms after the side collision in the CAE analysis result. In FIG. 6, (A) is the vehicle body 106 according to the comparative example, and (B) is the vehicle body 10 according to the first embodiment. 6 that the deformation amount (distortion amount) of the rocker 12 is significantly reduced in the vehicle body 10 according to the first embodiment compared to the vehicle body 106 according to the comparative example (see FIG. 6B). (See the area surrounded by the dashed line).

  Thus, in the first embodiment, even in the vehicle body 10 in which the front floor second cross member is omitted, by directly supporting the upper portion (ridge line L1) of the rocker 12 by the seat mounting bracket 32, The deformation amount of the rocker 12 at the time of a side collision can be greatly reduced (the rocker 12 can be prevented from falling). Thereby, the amount of penetration of the B pillar 16 and the rocker 12 into the passenger compartment can be greatly reduced without adding a reinforcing member. Therefore, the collision performance of the vehicle body can be improved without increasing the number of parts, cost, and weight of the vehicle body.

  In addition, in the first embodiment, the upper wall 34 of the seat mounting bracket 32 is obliquely downward from the coupling piece 35 toward the inside in the vehicle width direction (that is, the displacement direction of the ridge line L1 when the rocker 12 is twisted due to a side collision). It is extended to. Thereby, the displacement of the ridgeline L1 can be satisfactorily suppressed by the upper wall 34. In addition, the upper wall 34 is centered on the centroid X of the rocker 12 and extends along the tangent line at the joint portion S in the virtual circle C1 passing through the joint portion S between the upper surface of the rocker 12 and the joint piece 35. In addition, when the rocker 12 is twisted around the centroid X, the rocker 12 exhibits high rigidity against a load input to the upper wall 34. Thereby, since the said load can be favorably supported by the upper wall 34, the penetration | invasion amount of the rocker 12 can be reduced more effectively.

It should be noted that the position of the torsion center of the rocker 12 is not necessarily the position of the centroid X of the rocker 12, but varies depending on the side collision mode, the characteristics of the vehicle body, and the like. Therefore, the extending direction of the upper wall 34 is not limited to the configuration of the above embodiment, and it is preferable to change the setting as appropriate. However, the ridge line L1 at the upper part of the rocker 12 enters obliquely downward toward the inner side in the vehicle width direction. In many cases, the upper wall 34 is preferably extended obliquely downward from the upper surface side of the rocker 12 toward the inner side in the vehicle width direction.
<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, about the structure and effect | action fundamentally similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

  FIG. 7 is a perspective view of the seat mounting bracket 50 according to the second embodiment. The seat mounting bracket 50 has basically the same configuration as the seat mounting bracket 32 according to the first embodiment. However, in the seat mounting bracket 50, the front wall 38 and the rear wall 40 are inclined so as to be separated from each other toward the vehicle body lower side. For this reason, the ridgeline L2 formed in the connection part (bending part) of the inner wall 36 (1st side wall) and the upper wall 34, and the surface (surface on the vehicle rear side) of the rear wall 40 (2nd side wall) Is set to 90 degrees or more. In this embodiment, the angle formed by the ridge line L2 and the surface of the front wall 38 (surface on the vehicle front side) is also set to the same angle as θ.

  Further, as shown in FIG. 7, the inner wall 36 is formed in a trapezoidal shape when viewed in the vehicle width direction, and the vehicle body front side end portion of the inner wall 36 is inclined along the inclination of the front wall 38. is doing. Further, the vehicle body rear side end portion of the inner wall 36 is inclined so as to follow the inclination of the rear wall 40, and a plate-like contact piece 36 </ b> B is provided on the lower end side of the vehicle body rear side end portion of the inner wall 36. Is provided. The contact piece 36B is bent at the base end and extends outward in the vehicle width direction, and is in contact with the surface of the rear wall 40 (the surface on the rear side of the vehicle body) in the plate thickness direction. As shown in FIG. 9, the tip of the contact piece 36B is disposed on the outer side in the vehicle width direction (right side in FIG. 9) with respect to the ridge line L2, and the corner of the contact piece 36B has vertical corners at the top and bottom. Is provided. In the following description, the upper corner of the tip of the contact piece 36B is referred to as “vertex E”.

  Here, in the seat mounting bracket 50 having the above configuration, when the inner wall 36 tries to be separated from the rear wall 40 with the ridgeline L2 (connection portion with the upper wall 34) as the rotation center, the vertex E of the contact piece 36B becomes the ridgeline. It rotates around L2 as the center of rotation (see rotation locus C2 in FIG. 9). In this case, the vertex E once rotates downward as indicated by an arrow D in FIG.

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

  In the second embodiment, when a load is input from an unillustrated vehicle seat to the upper wall 34 of the seat mounting bracket 50 (see arrow F3 in FIG. 10), the inner wall 36 has the ridgeline L2 as the center of rotation. The inner wall 36 is going to be separated from the front wall 38 and the rear wall 40 in the direction of arrow A in FIG. In this case, the apex E of the contact piece 36B tends to rotate downward with the ridgeline L2 as the center of rotation (see arrow D in FIG. 9), but in this seat mounting bracket 50, the ridgeline L2 and the surface of the rear wall 40 Is set to 90 degrees or more, and therefore a part of the rear wall 40 exists in the rotation direction of the vertex E. For this reason, the vertex E interferes with the surface of the rear wall 40 (hangs on the surface), and the separation of the inner wall 36 is prevented. Thereby, the deformation of the inner wall 36 is suppressed, and the opening of the cross section between the inner wall 36 and the upper wall 34 (increase in the angle δ shown in FIG. 10) is suppressed. Thereby, the rigidity of the seat mounting bracket 50 with respect to the input from the vehicle seat can be improved.

  In addition, as what suppresses a deformation | transformation of the inner wall 36, there is a spot welding spot (portion marked with x in FIG. 7) between the inner wall 36 and the flange portions 38C and 40C. Since a load in the peeling direction is input to the hit point, it is difficult to sufficiently prevent the deformation of the inner wall 36. In this respect, in this embodiment, since the deformation of the inner wall 36 can be suppressed by the mechanical interference between the rear wall 40 and the contact piece 36B as described above, the rigidity of the seat mounting bracket 50 is sufficiently improved. Can do. Since the rigidity of the seat mounting bracket 50 can be improved in this way, the collision performance of the vehicle body against a side collision can be improved at the same time.

  Further, in the seat mounting bracket 50, the mechanical separation between the rear wall 40 and the contact piece 36B prevents the inner wall 36 and the rear wall 40 from being separated from each other. The workability at the time of spot welding the flange portions 38C, 40C and the inner wall 36 can be improved. That is, when the seat mounting bracket 50 is produced by bending a sheet metal material, the inner wall 36 tends to be separated from the front wall 38 and the rear wall 40 due to the occurrence of the spring back at the ridgeline L2, but the seat mounting bracket 50 Then, the separation can be prevented by mechanical interference between the abutting piece 36 </ b> B and the rear wall 40. Therefore, when spot welding the flange portions 38C, 40C and the inner wall 36, it is not necessary to use a jig for retaining the shape for preventing the above-mentioned separation, thereby facilitating the welding work. be able to. In addition, since the shape holding jig as described above can be eliminated, the production cost can be reduced.

  In the second embodiment, only one contact piece 36B is provided at the vehicle body rear side end of the inner wall 36. However, the present invention is not limited to this and is shown in FIG. Further, a contact piece 36C is also provided at the vehicle body front side end portion of the inner wall 36, and the contact piece 36C is brought into contact with the surface of the front wall 38 (surface on the vehicle body front side) as a third side wall. May be. In this case, since the inner wall 36 and the front wall 38 can be connected by mechanical interference between the contact piece 36C and the front wall 38, the rigidity of the seat mounting bracket can be further improved.

10 body 12 rocker 18 floor panel 32 seat mounting bracket 34 upper wall 35 connecting piece 36 inner wall (first side wall)
36B Abutting piece 40 Rear wall (second side wall)
X Rocker centroid S Joint part C1 of the top side of the rocker and joint piece Virtual circle L2 Edge line (joint part of upper wall and one side wall)

Claims (5)

A vehicle body structure having a seat mounting bracket coupled to a floor panel of a vehicle body and a rocker,
The seat mounting bracket is
An upper wall that is formed in a straight shape when viewed from the front-rear direction of the vehicle body, extends linearly from the upper surface side of the rocker toward the inner side in the vehicle width direction, and is connected to a vehicle seat;
A coupling piece provided at an outer end in the vehicle width direction of the upper wall and coupled to the upper surface side of the rocker;
A vehicle body structure characterized by comprising:   The vehicle body structure according to claim 1, wherein the upper wall extends obliquely downward from an upper surface side of the rocker.   The upper wall is centered on the centroid of the rocker, and extends along a tangent line at the coupling portion in a virtual circle passing through the coupling portion between the upper surface side of the rocker and the coupling piece. The vehicle body structure according to claim 2.   The seat mounting bracket has an upper end integrally connected to the upper wall, a lower end connected to the floor panel, an upper end integrally connected to the upper wall, and a lower end connected to the floor. 2. A second side wall adjacent to the first side wall and coupled to the panel, and connecting means for connecting the first side wall and the second side wall by mechanical interference. The vehicle body structure according to any one of claims 1 to 3.   The connecting means includes an abutting piece that extends from one of the first side wall and the second side wall and abuts against the other surface of the first side wall and the second side wall. Is inclined with respect to the connecting portion so that a part thereof is arranged in the movement locus of the abutting piece when being separated from the other centered on the connecting portion with the upper wall. The vehicle body structure according to claim 4.

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