JP2007106161A - Vehicle body side portion structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve vehicle body rigidity against side collision by means of a floor cross member. <P>SOLUTION: When the first bracket 40 is inclined to the inside in a vehicle width direction together with a rocker 12 by the side collision, the second bracket 42 is rotated upward the vehicle by an upper wall portion 40A of the first bracket 40 which is used as an inclination wall. Therefore, a vehicle width direction outer side edge portion 36D of the floor cross member 36 is pressed upward the vehicle by the second bracket 42, and the offset amount in the upper and lower direction of the vehicle between the vehicle width direction outer side edge portion 36D of the floor cross member 36 and an input position of collision load becomes shorter than the offset amount in the upper and lower direction of the vehicle between the input position of the collision load and the vehicle width direction outer side edge portion 36D of the floor cross member 36 when the vehicle width direction outer side edge part 36D of the floor cross member 36 does not move upward. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle body side structure, and more particularly to a vehicle body side structure in which a floor cross member is connected to a rocker disposed on a side of a vehicle body floor.

2. Description of the Related Art Conventionally, a vehicle body side structure that improves the rigidity of a vehicle body side portion in preparation for a vehicle side collision (hereinafter referred to as a side collision) is known (see, for example, Patent Document 1). In this technique, a gusset portion having a substantially hat-shaped cross section is integrally formed at the lower end portion of the pillar inner of the center pillar, and this gusset portion projects with a smooth slope toward the vehicle interior side, and the side sill inner It is welded to the floor panel and straddles the corner.
JP-A-8-175425

  However, in the vehicle body side structure disclosed in Patent Document 1, when a collision load is input from the bumper of the collision vehicle to the side portion of the own vehicle, the floor disposed along the vehicle width direction on the passenger compartment floor of the own vehicle. The input position of the collision load is greatly displaced (offset) with respect to the cross member. As a result, it is difficult to effectively support the collision load by the floor cross member, and it is difficult to improve the vehicle body rigidity against the side collision by the floor cross member.

  In view of the above facts, an object of the present invention is to provide a vehicle body side structure that can improve vehicle body rigidity against a side collision by a floor cross member.

  According to the present invention, a rocker having a longitudinal direction arranged along a vehicle longitudinal direction at a side portion of a vehicle body, a longitudinal direction arranged along a vehicle width direction, and an outer end portion in the vehicle width direction being the rocker. The floor cross member connected to the rocker and the connecting portion between the rocker and the floor cross member are disposed at the bottom, and the rocker falls inward in the vehicle width direction so that the outer end in the vehicle width direction of the floor cross member is And a floor cross member moving means for moving the vehicle upward and preventing the rocker from collapsing against the rocker.

  When a collision load acts on the inside of the rocker, which is disposed on the side of the vehicle body along the longitudinal direction of the vehicle body in the vehicle longitudinal direction, the rocker falls inward in the vehicle width direction. At this time, the vehicle width direction outer side end portion of the floor cross member, which is disposed along the vehicle width direction in the longitudinal direction and the vehicle width direction outer end portion is connected to the rocker, is a lower portion of the connection portion between the rocker and the floor cross member. The floor cross member moving means arranged at the position is moved upward of the vehicle and hits the rocker to prevent the rocker from falling down. As a result, the collision load can be supported by the floor cross member at a position close to the collision load input position.

  According to a second aspect of the present invention, in the vehicle body side part structure according to the first aspect, the floor cross member moving means is an inclined surface that extends from the lower side in the vehicle width direction to the upper side in the vehicle width direction. .

  The vehicle crosswise outer end of the floor cross member moves upward in the vehicle along an inclined surface that extends from the vehicle width direction inner lower portion to the vehicle width direction outer upper portion. As a result, it is possible to move the outer end in the vehicle width direction of the floor cross member upward with a simple configuration of an inclined surface.

  According to a third aspect of the present invention, in the vehicle body side part structure according to the second aspect, a first bracket disposed at a lower portion of a connecting portion between the rocker and the floor cross member and fixed to the rocker, and a longitudinal direction The second bracket is disposed along the vehicle width direction, the inner end in the vehicle width direction is coupled to the floor, and the outer end in the vehicle width direction is disposed between the floor cross member and the first bracket; The inclined surface is a connecting surface of the first bracket with the second bracket.

  In the first bracket arranged at the lower part of the connecting portion between the rocker and the floor cross member and fixed to the rocker, the connecting surface with the second bracket is an inclined surface, so the longitudinal direction is arranged along the vehicle width direction. The inner end in the width direction is connected to the floor, and the outer end in the vehicle width direction of the floor cross member is inclined together with the second bracket disposed between the floor cross member and the first bracket. Move upward along the surface of the vehicle. As a result, the outer end of the floor cross member in the vehicle width direction can be reliably moved upward by the first bracket and the second bracket.

  According to a fourth aspect of the present invention, in the vehicle body side portion structure according to the third aspect, the vehicle width of the floor cross member is provided at a joint portion between the first bracket and the second bracket. When the direction outer side end part moves upward in the vehicle, it has coupling release means for releasing the coupling between the first bracket and the second bracket.

  When the outer end in the vehicle width direction of the floor cross member moves together with the second bracket along the inclined surface of the first bracket, the coupling between the first bracket and the second bracket is released by the coupling release means. Is done. As a result, the amount of movement of the second bracket increases, so that the outer end in the vehicle width direction of the floor cross member can be moved largely upward in the vehicle.

  According to a fifth aspect of the present invention, in the vehicle body side part structure according to the fourth aspect, the connecting portion of the second bracket to the floor is a center of rotation when the second bracket rotates upward of the vehicle. It is characterized by that.

  When the coupling between the first bracket and the second bracket is released, the second bracket rotates upward in the vehicle around the coupling portion with the floor on the inner side in the vehicle width direction. Therefore, the floor cross member is rotated by the rotation of the second bracket. The outer end in the vehicle width direction can be moved further upward in the vehicle.

  According to the first aspect of the present invention, the rigidity of the vehicle body against a side collision can be improved by the floor cross member.

  According to the second aspect of the present invention, the rigidity of the vehicle body against a side collision can be improved with a simple configuration.

  According to the third aspect of the present invention, the rigidity of the vehicle body against the side collision can be reliably improved.

  The invention according to claim 4 can further improve the rigidity of the vehicle body against a side collision.

  The present invention according to claim 5 can further improve the rigidity of the vehicle body against a side collision.

  An embodiment of a vehicle body side part structure according to the present invention will be described with reference to FIGS.

  In the figure, the arrow UP indicates the vehicle upward direction, the arrow FR in the figure indicates the vehicle forward direction, and the arrow IN in the figure indicates the vehicle width inside direction.

  As shown in FIG. 3, in the automobile body 10 of the present embodiment, a pair of left and right rockers 12 are disposed along the longitudinal direction of the vehicle at both ends in the vehicle width direction of the lower part of the passenger compartment, which is a side part of the vehicle body. (The rocker on the right side of the vehicle is not shown).

  As shown in FIG. 1, the rocker 12 includes a rocker outer panel 14 that forms an outer portion in the vehicle width direction of the rocker 12, and a rocker inner panel 16 that forms an inner portion in the vehicle width direction of the rocker 12. The rocker outer panel 14 has a hat cross-sectional shape with an opening facing inward in the vehicle width direction, and an upper flange 14A and a lower flange 14B are formed at the opening end. The rocker inner panel 16 has a hat cross-sectional shape with an opening facing outward in the vehicle width direction, and an upper flange 16A and a lower flange 16B are formed at the opening end.

  The upper flange 14A and the lower flange 14B of the rocker outer panel 14 are respectively coupled to the upper flange 16A and the lower flange 16B of the rocker inner panel 16 by spot welding or the like. is doing. Further, a flange 20A formed on the outer edge in the vehicle width direction of the floor panel 20 toward the vehicle upper side is coupled to the lower end portion of the vertical wall portion 16C of the rocker inner panel 16 by spot welding or the like.

  As shown in FIG. 3, a lower end portion of the center pillar 24 is connected to the vehicle longitudinal direction intermediate portion of the rocker 12, and the center pillar 24 is arranged along the longitudinal direction of the vehicle. The center pillar 24 includes a center pillar outer panel 26 that constitutes the outer side portion of the center pillar 24 in the vehicle width direction, and a center pillar inner panel 28 that constitutes the inner side portion of the center pillar 24 in the vehicle width direction. Further, the lower portion of the center pillar 24 is gradually expanded in the vehicle front-rear direction, and a working opening 30 is formed in the vehicle front-rear direction central portion at the lower portion of the center pillar inner panel 28.

  As shown in FIG. 1, the lower end portion 26 </ b> A of the center pillar outer panel 26 is coupled to the outer surface in the vehicle width direction of the vertical wall portion 14 </ b> C of the rocker outer panel 14 by spot welding or the like. Further, the lower end portion 28A of the center pillar inner panel 28 is sandwiched between the upper flange 14A of the rocker outer panel 14 and the upper flange 16A of the rocker inner panel 16.

  As shown in FIG. 3, a floor cross member 36 is arranged in the longitudinal direction along the vehicle width direction at a position above the floor panel 20 on the inner side in the vehicle width direction of the lower portion (root portion) of the center pillar 24. In addition, the cross-sectional shape of the floor cross member 36 viewed from the vehicle width direction (longitudinal direction) is a U-shape with the opening directed downward in the vehicle.

  Further, a gap 37 is formed between the floor panel 20 and the floor cross member 36, and this gap 37 is a space where a passenger seated in the rear seat can insert a toe.

  As shown in FIG. 4, a flange 36 </ b> B is formed at the vehicle front side end portion of the upper wall portion 36 </ b> A of the floor cross member 36, and the vehicle rear side of the upper wall portion 36 </ b> A of the floor cross member 36. A flange 36C is formed at the end portion toward the vehicle lower side. A work cutout 38 is formed in the upper wall portion 36A in the vicinity of the vehicle width direction outer side end portion 36D of the floor cross member 36.

  As shown in FIG. 3, the vehicle width direction outer end portion 36 </ b> D of the floor cross member 36 is connected to the rocker inner panel 16 via a first bracket 40 and a second bracket 42. The two brackets 42 are disposed below the connecting portion between the rocker 12 and the floor cross member 36.

  As shown in FIG. 4, the first bracket 40 has a substantially rectangular box shape in which the vehicle width direction outer side portion and the vehicle lower side portion are opened. The upper wall portion 40A of the first bracket 40 is inclined from the lower side in the vehicle width direction toward the upper side in the vehicle width direction, and the upper wall portion 40A is an inclined surface as a floor cross member moving means. Further, a through hole 41 is formed in a substantially central portion of the upper wall portion 40A, and a weld nut 44 is fixed to the lower surface of the upper wall portion 40A of the first bracket 40 coaxially with the through hole 41. Yes.

  A flange 40B is formed on the outer end in the vehicle width direction of the upper wall portion 40A of the first bracket 40, and the flange 40B is spotted on the upper surface of the upper wall portion 16D of the rocker inner panel 16. They are joined by welding or the like. Further, a flange 40D is formed at the lower end portion of the first side wall 40C in the vehicle width direction toward the inner side in the vehicle width direction, and the flange 40D is coupled to the upper surface 20B of the floor panel 20 by spot welding or the like. Has been.

  A flange 40F is formed at a vehicle width direction outer side end portion of the vehicle front wall portion 40E of the first bracket 40 toward the vehicle front side, and the flange 40F is a vehicle width direction of the vertical wall portion 16C of the rocker inner panel 16. The inner side surface is coupled to the inner side surface in the vehicle width direction of the flange 20A of the floor panel 20 by spot welding or the like. Further, a flange 40G is formed at the vehicle lower side end portion of the vehicle front wall portion 40E of the first bracket 40 toward the vehicle front side, and the flange 40G is formed at the vehicle width direction outer end portion of the floor panel 20. It is formed and joined to the upper surface of the inclined wall portion 20C which is inclined from the vehicle width direction inner lower side to the vehicle width direction outer upper side by spot welding or the like.

  Similarly, a flange 40J is formed on the vehicle width direction outer side end portion of the vehicle rear wall portion 40H of the first bracket 40 toward the vehicle rear side, and the flange 40J is formed on the vertical wall portion 16C of the rocker inner panel 16. The inner side surface in the vehicle width direction and the inner side surface in the vehicle width direction of the flange 20A of the floor panel 20 are coupled by spot welding or the like. Further, a flange 40K is formed at the vehicle lower side end portion of the vehicle rear wall portion 40H of the first bracket 40 toward the vehicle rear side, and the flange 40K is formed on the upper surface of the inclined wall portion 20C of the floor panel 20. They are joined by spot welding or the like.

  As shown in FIG. 3, the second bracket 42 is disposed at the lower part of the connecting portion between the floor cross member 36 and the rocker 12, and the longitudinal direction is disposed along the vehicle width direction.

  As shown in FIG. 4, the cross-sectional shape of the second bracket 42 viewed from the longitudinal direction is a hat cross-sectional shape with the opening directed upward in the vehicle, and the second bracket 42 has an inner end in the vehicle width direction. A bottom wall portion 42A having a flat plate shape is formed. Further, the inner end portion 42C in the vehicle width direction of the bottom wall portion 42A of the second bracket 42 is coupled to the upper surface 20B of the floor panel 20 by spot welding or the like.

  The lower wall portion 42B constituting the bottom portion of the hat cross-sectional shape of the second bracket 42 is inclined from the outer end in the vehicle width direction of the bottom wall portion 42A toward the upper outer side in the vehicle width direction, and the lower wall portion 42B (the lower surface thereof) ) Is an inclined surface. Further, the upper portion of the lower wall portion 42B (the lower surface) serves as a joint surface with the upper wall portion 40A (the upper surface) of the first bracket 40.

  A coupling hole 46 is formed in the vicinity of the upper end portion of the lower wall portion 42B of the second bracket 42. The outer side in the vehicle width direction of the coupling hole 46 is a long hole portion 46A whose longitudinal direction is along the vehicle width direction, and the screw portion 50A of the mounting bolt 50 is inserted into the outer side in the vehicle width direction of the long hole portion 46A. ing. Further, the screw portion 50 </ b> A of the mounting bolt 50 passes through the through hole 41 formed in the upper wall portion 40 </ b> A of the first bracket 40 and is screwed to the weld nut 44.

  Accordingly, the lower wall portion 42 </ b> B of the second bracket 42 is coupled to the upper wall portion 40 </ b> A of the first bracket 40 by the fastening force between the mounting bolt 50 and the weld nut 44.

  In addition, as shown in FIG. 2, a bumper K or the like of another vehicle side-projects from the outer side in the vehicle width direction to the side of the vehicle body, for example, the center pillar 24 or the side door, and the center pillar 24, the rocker 12 and the first bracket. When 40 collapses inward in the vehicle width direction (in the direction of arrow A in FIG. 2) (when the portion of the rocker 12 that protrudes from the longitudinal direction is twisted), the bottom wall of the second bracket 42 The bottom wall portion of the second bracket 42 acts on the fastening force between the mounting bolt 50 and the weld nut 44 in a state where the vehicle width direction inner end portion 42C of the portion 42A and the floor panel 20 are kept connected. 42B moves relative to the upper wall portion 40A of the first bracket 40 upward in the vehicle width direction (in the direction of arrow B in FIG. 2), and the second bracket 42 is coupled to the floor panel 20 in the vehicle width direction. Centering on the end 42C And rotates to both upward (arrow C direction in FIG. 2).

  At this time, as shown in FIG. 2, the vicinity of the lower portion of the inner side wall portion 40 </ b> C in the vehicle width direction of the first bracket 40 is buckled and deformed.

  As shown in FIG. 4, a wide portion 46 </ b> B as a coupling release means is formed on the inner side in the vehicle width direction of the coupling hole 46. The wide portion 46B is continuous with the long hole portion 46A, and the length in the vehicle front-rear direction is wider than the long hole portion 46A, so that the head 50B of the mounting bolt 50 can pass through.

  Accordingly, when the lower wall portion 42B of the second bracket 42 moves a predetermined distance relative to the upper wall portion 40A of the first bracket 40 toward the outer side of the vehicle width (in the direction of arrow B in FIG. 2), the head of the mounting bolt 50 The part 50B passes through the wide part 46B, and the connection between the second bracket 42 and the first bracket 40 by the mounting bolt 50 and the weld nut 44 is completely released.

  Further, the second bracket 42 and the first bracket 40 are completely released from the coupling, whereby the second bracket 42 is located above the vehicle centering on the vehicle width direction inner end portion 42C coupled to the floor panel 20 (see FIG. 2) (in the direction of arrow C). As a result, the outer end 36D of the floor cross member 36 in the vehicle width direction is pushed upward by the second bracket 42, and the intermediate portion in the longitudinal direction of the floor cross member 36 is bent. The offset amount L1 in the vehicle vertical direction between the end portion 36D (in FIG. 1 and FIG. 2, the position indicated by the centroid position P2 at the outer end in the vehicle width direction of the floor cross member 36) and the input position P1 of the collision load F1 is Offset amount L2 in the vehicle vertical direction between the vehicle width direction outer side end portion 36D of the floor cross member 36 and the input position P1 of the collision load F1 when the vehicle width direction outer side end portion 36D of the floor cross member 36 does not move upward (see FIG. 1) (L1 <L2).

  Note that the vehicle width direction outer end portion 36D of the floor cross member 36 that has moved upward hits the upper end portion of the vertical wall portion 16C of the rocker inner panel 16 indirectly via the upper wall portion 40A of the first bracket 40, and The rocker 12 is prevented from falling in the direction toward the vehicle interior.

  Further, the bolt fastening work cutout 38 formed in the upper wall portion 36A of the floor cross member 36 is sized to allow the mounting bolt 50 to pass therethrough.

  As shown in FIG. 4, a front wall portion 42 </ b> D is formed at the vehicle front end portion of the lower wall portion 42 </ b> B of the second bracket 42 toward the vehicle width direction inner side, and the vehicle width direction inner end of the front wall portion 42 </ b> D is formed. The part is formed with a flange 42E toward the front of the vehicle. Similarly, a rear wall portion 42F is formed at the vehicle rear end portion of the lower wall portion 42B of the second bracket 42 toward the inner side in the vehicle width direction, and at the inner end portion in the vehicle width direction of the rear wall portion 42F. A flange 42G is formed toward the rear of the vehicle.

  Further, a vehicle front side surface 36E on the outer side in the vehicle width direction of the flange 36B of the floor cross member 36 is coupled to the upper vehicle rear side surface 42H of the front wall portion 42D of the second bracket 42 by spot welding or the like. The coupling | bonding of a site | part is not removed when the 2nd bracket 42 rotates upwards. Similarly, the vehicle rear side surface 36F on the outer side in the vehicle width direction of the flange 36C of the floor cross member 36 is coupled to the upper vehicle front side surface 42J of the rear wall portion 42F of the second bracket 42 by spot welding or the like. The coupling | bonding of this site | part is not removed when the 2nd bracket 42 rotates upwards.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 2, the bumper K of the other vehicle side impacts from the outside in the vehicle width direction to the side of the vehicle body, for example, the center pillar 24 or the side door, and the center pillar 24, the rocker 12, and the first bracket 40 are When the vehicle body is tilted inward in the vehicle width direction (in the direction of arrow A in FIG. 2), a state in which the vehicle width direction inner side end portion 42C of the bottom wall portion 42A of the second bracket 42 and the floor panel 20 are maintained. Thus, the lower wall portion 42B of the second bracket 42 acts on the fastening force between the mounting bolt 50 and the weld nut 44 relative to the upper wall portion 40A of the first bracket 40 (see FIG. 2). The second bracket 42 rotates upward (in the direction of arrow C in FIG. 2) about the vehicle width direction inner end 42 </ b> C coupled to the floor panel 20.

  At this time, the second bracket 42 moves along the upper wall portion 40A of the first bracket 40 that is an inclined surface that is inclined from the lower inside in the vehicle width direction toward the upper outside in the vehicle width direction. Further, as shown in FIG. 2, the vicinity of the lower portion of the first lateral bracket 40C in the vehicle width direction is buckled and deformed.

  Next, when the second bracket 42 moves a predetermined distance in the direction of arrow B relative to the upper wall portion 40A of the first bracket 40, the head portion 50B of the mounting bolt 50 passes through the wide portion 46B of the coupling hole 46. Thus, the coupling between the second bracket 42 and the first bracket 40 is completely released. For this reason, the second bracket 42 further rotates upward (in the direction of arrow C in FIG. 2) around the vehicle width direction inner end portion 42 </ b> C of the bottom wall portion 42 </ b> A coupled to the floor panel 20.

  As a result, the floor cross member 36 is bent at the middle in the longitudinal direction, so that the outer end 36D in the vehicle width direction of the floor cross member 36 is pushed upward by the second bracket 42 and moved upward. The vehicle width direction outer side end portion 36D of the first bracket 40 indirectly hits the upper end portion of the vertical wall portion 16C of the rocker inner panel 16 via the upper wall portion 40A of the first bracket 40, and the rocker 12 falls in the vehicle interior direction. To prevent.

  For this reason, the vehicle width direction outer side end portion 36D of the floor cross member 36 is moved upward by the vehicle vertical direction offset amount L1 between the vehicle width direction outer side end portion 36D of the floor cross member 36 and the input position P1 of the collision load F1. The vehicle crosswise direction offset amount L2 (see FIG. 1) between the vehicle width direction outer side end portion 36D of the floor cross member 36 and the input position P1 of the collision load F1 is shorter (L1 <L2).

  Therefore, in this embodiment, the collision load F1 at the time of a side collision can be supported by the floor cross member 36 at a height (position) close to the input position P1 of the collision load F1. As a result, the vehicle body rigidity against the side collision can be improved as compared with the case where the vehicle width direction outer side end portion 36D of the floor cross member 36 does not move upward. For this reason, the deformation | transformation to the vehicle interior side direction of a vehicle side part can be suppressed at the time of a side collision.

  Further, in the present embodiment, the floor cross member 36 does not need to be arranged at a high position in advance, so that the vehicle interior space is not restricted by the floor cross member 36. Further, in the present embodiment, the weight of the vehicle body is not significantly increased as compared with the configuration in which the thickness of the floor cross member 36 is increased to improve the rigidity.

  Further, in the present embodiment, the vehicle is provided with the upper wall portion 40A of the first bracket 40 in which the lower wall portion 42B of the second bracket 42 coupled to the lower portion of the outer end portion in the vehicle width direction of the floor cross member 36 is an inclined surface. With a simple configuration of supporting from below, the vehicle body rigidity against side collision can be improved.

  In the present embodiment, when the collision load F <b> 1 is applied, the first bracket 40 fixed to the rocker 12 falls and the second bracket 42 moves relative to the upper wall portion 40 </ b> A of the first bracket 40. Thus, the vehicle crosswise outer end of the floor cross member 36 is pushed upward in the vehicle. For this reason, by interposing the first bracket 40 and the second bracket 42, the outer end in the vehicle width direction of the floor cross member 36 can be reliably moved upward with respect to the falling of the rocker 12, and the vehicle body rigidity against side collision can be increased. It can be definitely improved.

  Further, in the present embodiment, when the second bracket 42 moves a predetermined distance toward the upper outside of the vehicle width (in the direction of arrow B in FIG. 2) relative to the upper wall portion 40A of the first bracket 40, the mounting bolt 50 and the weld The coupling between the second bracket 42 and the first bracket 40 by the nut 44 is completely released, and the second bracket 42 is located above the vehicle centering on the vehicle width direction inner end portion 42C of the bottom wall portion 42A (arrow C in FIG. 2). ). For this reason, the amount of movement of the outer end in the vehicle width direction of the second bracket 42 to the upper side of the vehicle is increased, and the outer end of the floor cross member 36 in the vehicle width direction can be moved to the upper side of the vehicle. This can be further improved.

  Moreover, in this embodiment, since the 2nd bracket 42 is couple | bonded with the floor panel 20 after a deformation | transformation, a part of collision load F1 can be supported by the floor panel 20 via the 2nd bracket 42. FIG.

  In the above, the present invention has been described in detail with respect to specific embodiments. However, the present invention is not limited to the above embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above embodiment, the upper wall portion 40A of the first bracket 40 is an inclined surface as the floor cross member moving means, but the floor cross member moving means is not limited to the inclined surface, and the rocker 12 and the floor cross member 36 are used. And the rocker 12 is moved inward in the vehicle width direction to move the outer end portion 36D of the floor cross member 36 in the vehicle width direction so that the rocker 12 directly or indirectly contacts the rocker 12. As long as the structure prevents the rocker 12 from falling down, a structure other than the inclined surface may be used.

  Further, in the above embodiment, the vehicle width direction outer side end portion 36D of the floor cross member 36 that has moved upward is indirectly connected to the vertical wall portion 16C of the rocker inner panel 16 via the upper wall portion 40A of the first bracket 40. The rocker 12 is configured to prevent the rocker 12 from collapsing in the direction toward the interior of the vehicle interior. Instead, the outer end 36D of the floor cross member 36 in the vehicle width direction is the vertical wall portion 16C of the rocker inner panel 16. It is also possible to prevent the rocker 12 from collapsing in the direction toward the interior of the vehicle by directly hitting the upper end portion or the center pillar 24.

  Further, in the above embodiment, the wide portion 46B as the coupling release means is formed in the coupling hole 46, and when the vehicle width direction outer side end portion 36D of the floor cross member 36 moves upward in the vehicle, the head of the mounting bolt 50 50B passes through the wide portion 46B so that the connection between the first bracket 40 and the second bracket 42 is released, but the connection release means is not limited to the wide portion 46B of the connection hole 46, and the bolt 50 is broken. It is good also as other coupling | bonding cancellation | release means, such as a weak part formed in the volt | bolt 50 which cancels | releases the coupling | bonding of the 1st bracket 40 and the 2nd bracket 42 by doing.

  In the above embodiment, the vehicle width direction inner end portion 42C of the bottom wall portion 42A of the second bracket 42 is coupled to the floor panel 20, but the vehicle width direction inner end portion 42C of the bottom wall portion 42A of the second bracket 42 is used. It is good also as a structure couple | bonded with other members, such as a floor reinforcement arranged on the floor.

  In the above embodiment, the cross-sectional shape of the floor cross member 36 viewed from the vehicle width direction (longitudinal direction) is a U-shape with the opening facing the vehicle lower side. The cross-sectional shape viewed from (direction) may be another cross-sectional shape such as a rectangle.

  Further, in the above embodiment, the vehicle body side part structure of the present invention is applied to the floor cross member 36 arranged on the inner side in the vehicle width direction of the center pillar 24. However, the vehicle body side part structure of the present invention is applied from the center pillar 24 to the vehicle. The present invention can also be applied to floor cross members arranged at positions separated in the front-rear direction.

FIG. 4 is an enlarged sectional view taken along line 1-1 of FIG. It is sectional drawing corresponding to FIG. 1 which shows the side collision state in the vehicle body side part structure which concerns on one Embodiment of this invention. It is a perspective view which makes a section the part seen from the vehicles slanting back inner side which shows the body side part structure concerning one embodiment of the present invention. It is a disassembled perspective view which makes the cross section the part seen from the vehicle diagonally back inner side which shows the vehicle body side part structure which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Auto body 12 Rocker 14 Rocker outer panel 16 Rocker inner panel 20 Floor panel 24 Center pillar 26 Center pillar outer panel 28 Center pillar inner panel 36 Floor cross member 40 First bracket 40A Upper wall part of the first bracket (floor cross member moving means, Inclined surface)
42 Second bracket 42B Lower wall portion of the second bracket 42C Inner end in the vehicle width direction of the lower wall portion of the second bracket 44 Weld nut 46 Coupling hole 46A Long hole portion of the coupling hole 46B Wide portion of the coupling hole (coupling release means )
50 Mounting bolt F1 Collision load L1 Offset amount L2 Offset amount P1 Collision load input position

Claims (5)

A rocker arranged in the longitudinal direction on the side of the vehicle body along the longitudinal direction of the vehicle body,
A floor cross member that is arranged along the vehicle width direction in the longitudinal direction and whose outer end portion in the vehicle width direction is connected to the rocker;
The rocker is disposed at a lower portion of a connecting portion between the rocker and the floor cross member. When the rocker is tilted inward in the vehicle width direction, the vehicle width direction outer end of the floor cross member is moved upward in the vehicle and applied to the rocker. Floor cross member moving means for preventing the rocker from falling down,
Car body side part structure characterized by having   The vehicle body side part structure according to claim 1, wherein the floor cross member moving means is an inclined surface that extends from the lower side in the vehicle width direction to the upper side in the vehicle width direction.   A first bracket disposed at a lower portion of a connecting portion between the rocker and the floor cross member and fixed to the rocker; a longitudinal direction disposed along the vehicle width direction; and an inner end in the vehicle width direction coupled to the floor. A second bracket disposed between the floor cross member and the first bracket, and the inclined surface is a coupling surface of the first bracket with the second bracket. The vehicle body side part structure according to claim 2, wherein:   When the outer end in the vehicle width direction of the floor cross member moves together with the second bracket to the upper side of the vehicle, the first bracket and the second bracket are provided at a coupling portion between the first bracket and the second bracket. 4. The vehicle body side structure according to claim 3, further comprising coupling release means for releasing the coupling with the bracket.   5. The vehicle body side structure according to claim 4, wherein a connecting portion of the second bracket with the floor is a center of rotation when the second bracket rotates upward of the vehicle.

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