JP2007296957A - Floor structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor structure for a vehicle capable of efficiently transmitting a load at the time of vehicular collision. <P>SOLUTION: A first cross member 17 is coupled to a side sill 11 at a first end, and coupled to a floor tunnel 15 extending to a vehicle oblique front side at a second end. A second cross member 19 is coupled to the side sill 11 at a first end, and coupled to a floor tunnel 15 extending in a vehicle oblique rear side at a second end. A load which the side sill 11 receives from a front surface and an oblique direction at the time of collision can be efficiently transmitted to the floor tunnel 15 by first and second cross members 17, 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle floor structure.

Conventionally, as described in JP-A-2003-252251, a vehicle floor structure is provided perpendicular to a side sill and a floor tunnel that are parallel to each other and extend in the front-rear direction of the vehicle, and one end is connected to the side sill. Further, one having a plurality of cross members whose other ends are connected to a floor tunnel is known. This cross member is for reinforcing the floor structure.
Japanese Patent Laid-Open No. 2003-252251

  However, in such a floor structure, an input load component transmitted from the front to the rear of the side sill is difficult to be transmitted to the cross member provided perpendicular to the side sill. Therefore, the efficiency of transmitting the input load from the front and oblique directions of the vehicle at the time of the vehicle collision is poor.

  Accordingly, an object of the present invention is to provide a vehicle floor structure that can transmit a load at the time of a vehicle collision more efficiently.

  That is, the vehicle floor structure according to the present invention includes a floor panel that constitutes a vehicle floor, a floor tunnel that is formed in the floor panel and extends in the vehicle front-rear direction at the center in the vehicle width direction, and a side portion of the floor panel. A side sill formed and extending in a direction parallel to the floor tunnel, a first cross member having one end connected to the side sill, the other end extending obliquely forward of the vehicle and connected to the floor tunnel, and one end being a first cross And a second cross member that is connected to the side sill on the vehicle front side from the connecting portion between the member and the side sill, and has the other end extending obliquely rearward of the vehicle and connected to the floor tunnel.

  According to this invention, one end of the first cross member is connected to the side sill, the other end extends obliquely forward of the vehicle and is connected to the floor tunnel, one end of the second cross member is connected to the side sill, and the other end is connected to the side sill. Since it extends obliquely rearward of the vehicle and is connected to the floor tunnel, the input load component transmitted along the longitudinal direction of the side sill is distributed to the first and second cross members provided obliquely with respect to the side sill. And transmitted to the floor tunnel via the first and second cross members. Therefore, it is possible to efficiently transmit the load from the front surface and the oblique direction at the time of the collision received by the side sill to the floor tunnel by the first and second cross members. Moreover, the load at the time of a collision can be received efficiently by the first and second cross members.

  In the vehicle floor structure according to the present invention, it is preferable that the first cross member and the side sill are connected at a connection position between the side sill and the center pillar.

  According to the present invention, the impact at the side collision received by the center pillar can be efficiently transmitted to the floor tunnel via the first cross member. Moreover, the impact at the side collision received by the center pillar can be more reliably received by the first cross member. Furthermore, since the other end of the first cross member extends obliquely forward, it is possible to secure a wider space for arranging the legs of the rear seat occupant.

  In the vehicle floor structure according to the present invention, the first cross member and the second cross member are preferably arranged so as to form an X shape.

  According to this invention, the load received by the side sill at the time of impact is efficiently transmitted by the first cross member and the second cross member, and the load applied to the vehicle can be dispersed. Therefore, relative displacement between the side sill and the floor tunnel and deformation of the floor panel can be suppressed.

  In the vehicle floor structure according to the present invention, the other end of the first cross member is preferably connected to the other end of the second cross member.

  According to this invention, the load received by the side sill at the time of impact is efficiently transmitted by the first cross member and the second cross member, and the load applied to the vehicle can be dispersed. Therefore, relative displacement between the side sill and the floor tunnel and deformation of the floor panel can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the impact at the time of a vehicle collision can be transmitted more efficiently.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a vehicle floor structure according to a first embodiment of the present invention. In the WLH orthogonal coordinate system shown in the drawings, the W direction indicates the vehicle width direction, the L direction indicates the vehicle longitudinal direction, and the H direction indicates the vehicle vertical direction. An arrow Y indicates the front direction of the vehicle.

  As shown in FIG. 1, the vehicle floor structure according to this embodiment includes a pair of side sills 11, a floor panel 13, a floor tunnel 15, two first cross members 17, and two second cross members 19. Configured.

  A pair of side sill 11 is each arrange | positioned along the vehicle front-back direction in the both sides of the vehicle in the floor of a vehicle. Each side sill 11 includes a portion that extends in the vehicle front-rear direction and forms an outer portion in the vehicle width direction, and a portion that extends in the vehicle front-rear direction and forms an inner portion in the vehicle direction, and is formed in a hollow pipe shape. . A front pillar 23 and a center pillar 25 are connected to each side sill 11.

  One end of the front pillar 23 is connected to the vehicle front portion of the pair of side sills 11 and extends in the vehicle upward direction. One end of each of the center pillars 25 is connected to the center of the pair of side sills 11 in the vehicle front-rear direction, and extends in the vehicle upper direction. That is, the front pillar 23 and the center pillar 25 respectively constitute part of the side surface of the vehicle.

  The floor panel 13 is disposed between the pair of side sills 11 to constitute a vehicle floor. Flange extending in the vehicle upward direction is formed at both ends in the vehicle width direction of the floor panel 13. The flange is spot welded to a portion constituting the inner side of the side sill 11 in the vehicle direction so that the pair of side sills 11 have portions protruding in the vehicle upward direction with respect to the main surface of the floor panel 13.

  In addition, an area that overlaps with the place where the center pillar 25 and the side sill 11 are connected to each other when viewed from the side of the vehicle on the floor panel 13 is included in the area 30 where the feet of the rear seat passenger are placed. In addition, a floor tunnel 15 that bulges upward in the vehicle and extends in the vehicle front-rear direction is formed at the center in the vehicle width direction of the floor panel 13.

  The floor tunnel 15 extends in the vehicle front-rear direction at the center in the vehicle width direction of the floor panel 13 and protrudes from the main surface of the floor panel 13. The floor tunnel 15 extends in a direction parallel to the pair of side sills 11.

  One end of each of the two first cross members 17 is connected to the pair of side sills 11, and the other end extends obliquely forward of the vehicle and is connected to the floor tunnel 15. Each first cross member 17 is located on the floor panel 13. That is, the first cross member 17 is disposed so that the longitudinal direction intersects the longitudinal direction of the pair of side sills 11 and the floor tunnel 15.

  One end of each of the two first cross members 17 is connected to the side sill 11 at a position where the center pillar 25 is connected to the corresponding side sill 11. That is, one end of each first cross member 17 is connected to the side sill 11 at a position where the side sill 11 and the center pillar 25 are connected in the vehicle longitudinal direction.

  One end of each of the two first cross members 17 is connected to the side sill 11 at a position corresponding to the region 30 of the floor panel 13 in the vehicle longitudinal direction. Since the other end of the first cross member 17 extends obliquely forward of the vehicle, the first cross member 17 is disposed avoiding the region 30 where the foot of the rear seat occupant is placed.

  One end of each of the two second cross members 19 is connected to a position on the front side of the vehicle with respect to the connection position between the side sill 11 and the first cross member 17 in each of the pair of side sills 11, and the other end extends obliquely rearward of the vehicle. It is connected to the floor tunnel 15. Each second cross member 19 is located on the floor panel 13. That is, the second cross member 19 is disposed such that the longitudinal direction intersects the longitudinal direction of the pair of side sills 11 and the floor tunnel 15.

  One ends of the two second cross members 19 are connected to the side sill 11 at a position where the other end of the first cross member 17 and the floor tunnel 15 are connected in the vehicle longitudinal direction. The other ends of the two second cross members 19 are connected to the floor tunnel 15 at a position where one end of the first cross member 17 and the side sill 11 are connected in the vehicle longitudinal direction. That is, the first cross member 17 and the second cross member 19 are disposed so as to form an X shape when viewed from above the vehicle. The second cross member 19 is disposed so as to avoid the region 30 where the foot of the rear seat passenger is placed.

  The floor structure of the present embodiment further includes a floor cloth 21. The floor cloth 21 is disposed between the pair of side sills 11 along the vehicle width direction. One end of the floor cross 21 is connected to the vehicle rear portion of one side sill 11, and the other end of the floor cross 21 is connected to the vehicle rear portion of the other side sill 11. The floor cloth 21 is disposed so that the longitudinal direction is perpendicular to the longitudinal direction of the pair of side sills 11 and the floor tunnel 15.

  2 is a cross-sectional view showing a cross-sectional structure taken along the line II-II of FIG. 1, and is a view showing a cross-sectional structure perpendicular to the longitudinal direction of the first cross member 17 and the second cross member 19. As shown in FIG. The cross-sectional shapes of the first and second cross members 17 and 19 are U-shaped with the opening facing the floor panel 13, and both end portions along the longitudinal direction extend along the surface of the floor panel 13. It has a flange 17A. Further, the first cross member 17 and the second cross member 19 form a truss shape together with the coupling member.

  Subsequently, the operation of the vehicle floor structure according to the present embodiment will be described in more detail.

  FIG. 3 is an explanatory diagram of load transmission at the time of front collision in the floor structure of FIG. At the time of the front collision, the tire load 43 received from the tire from the front of the side sill 11 to the side sill 11 is applied. The tire load 43 is transmitted to the rear side of the side sill 11 along the longitudinal direction of the side sill 11 as a side sill load 45. The side sill load 45 is transmitted to the rear side of the side sill 11 along the longitudinal direction of the side sill 11 at the connection portion between the side sill 11 and the second cross member 19, and the long side of the second cross member 19. It is divided and transmitted to the cross member load 49 transmitted to the rear side along the direction.

  Then, the cross member load 49 is transmitted to the floor tunnel 15. In this way, one end of the second cross member 19 is connected to the side sill 11 and the other end extends obliquely rearward of the vehicle and is connected to the floor tunnel 15. Can be efficiently transmitted to the floor tunnel.

  By the way, in the conventional vehicle floor structure, the cross member is arranged perpendicular to the longitudinal direction of the side sill with respect to the side sill extending in the longitudinal direction of the vehicle. Therefore, the load transmitted along the longitudinal direction of the side sill 11 is difficult to be transmitted to the cross member provided perpendicular to the side sill. Therefore, even if the strength of the cross member is increased, it is difficult to improve the mechanical strength of the floor structure so as to efficiently receive the load transmitted along the longitudinal direction of the side sill 11.

  In contrast, in the vehicle floor structure of the present embodiment, the load transmitted along the longitudinal direction of the side sill 11 is efficiently transmitted to the first and second cross members 17 and 19. Therefore, by improving the strength of the first and second cross members 17 and 19 according to the load transmitted along the longitudinal direction of the side sill 11, the load transmitted along the longitudinal direction of the side sill 11 is efficiently The mechanical strength of the floor structure can be improved so as to be received well. That is, the strength design of each member constituting the floor can be easily performed by controlling the load transmission path.

  FIG. 4 is an explanatory diagram of a shear load at the time of front collision in the floor structure of FIG. At the time of the front collision, the mass inertia force 51 is applied from the rear of the vehicle to the front in the floor tunnel 15. That is, a shear load is applied to the floor panel 13 by the side sill load 45 and the mass inertial force 51 that are applied in opposite directions. A part of the mass inertial force 51 is transmitted to the second cross member 19 as a cross member load 53 via a connecting portion between the floor tunnel 15 and the second cross member 19. Further, as described above, a part of the side sill load 45 is transmitted to the second cross member 19 as the cross member load 49. Therefore, the shear load applied to the floor panel 13 is reduced. Therefore, deformation of the floor panel 13 can be suppressed, and breakage of spot welding between the floor panel 13 and the side sill 11 can be suppressed.

  The first cross member 17 and the second cross member 19 are connected to the side sill 11 and the floor tunnel 15 at both ends to form an X shape when viewed from above. Therefore, the shear load can be efficiently dispersed, and the relative positional deviation between the side sill and the floor tunnel and the shear deformation of the floor panel 13 can be suppressed. Moreover, since the 1st cross member 17 and the 2nd cross member 19 form the truss shape with the connection member, the said shear load can be disperse | distributed more efficiently.

  FIG. 5 is an explanatory diagram of load transmission at the time of a side collision in the floor structure of FIG. A load applied to the side sill 11 at the time of a side collision is divided into a side sill load 55 transmitted through the first cross member 17 and a side sill load 57 transmitted through the second cross member 19 and is transmitted to the floor tunnel 15. The Therefore, the load applied to the side sill 11 at the time of a side collision can be efficiently transmitted to the floor tunnel 15.

  FIG. 6 is an explanatory diagram of the load at the time of a side collision in the floor structure of FIG. A barrier load 59 is applied from the vehicle side surface to the vehicle side surface at the time of a side collision. A part of the barrier load 59 is applied to the center pillar 25 as the center pillar load 61. The center pillar load 61 is transmitted to the side sill 11 through a connecting portion between the center pillar 25 and the side sill 11. The center pillar load 61 is a load applied in a direction perpendicular to the longitudinal direction of the side sill 11.

  By the way, the conventional vehicle floor structure is provided with a plurality of side sills and floor tunnels which are parallel to each other and extend in the vehicle front-rear direction, one end is connected to the side sill and the other end is connected to the floor tunnel. It is configured with a cross member. In this case, one end of the cross member is connected to the side sill in front of the connection position between the side sill and the center pillar in order to secure a region for arranging the legs of the rear seat occupant. Therefore, the center pillar load applied to the side sill 11 at the time of a side collision cannot be efficiently received by the cross member.

  On the other hand, in the vehicle floor structure of the present embodiment, one end of the first cross member 17 is connected to the side sill 11 at a position where the center pillar 25 is connected to the side sill 11, so The pillar load 61 can be received by the force 63 of the first cross member 17.

  FIG. 7 is an explanatory diagram of a load at the time of a side collision in the floor structure of FIG. A side sill load 65 is applied to the side sill 11 from the side of the vehicle during a side collision. The first cross member 17 and the second cross member 19 are connected to the side sill 11 and the floor tunnel 15 at both ends to form an X shape when viewed from above. Therefore, the side sill load 65 can be efficiently received by the forces 63 and 67 of the first cross member 17 and the second cross member 19. Therefore, deformation of the side sill 11 and the floor panel 13 can be suppressed. Moreover, since the 1st cross member 17 and the 2nd cross member 19 form the truss shape with the connection member, the side sill load 65 can be received more efficiently.

  As described above, in the vehicle floor structure of the present embodiment, one end of the first cross member 17 is connected to the side sill 11, the other end extends obliquely forward of the vehicle and is connected to the floor tunnel 15, and the second Since one end of the cross member 19 is connected to the side sill 11 and the other end extends obliquely rearward of the vehicle and is connected to the floor tunnel 15, an input load component transmitted along the front-rear direction of the side sill 11 is transmitted to the side sill 11. The first and second cross members 17 and 19 provided obliquely are distributed to the floor tunnel 15 via the first and second cross members 17 and 19. Therefore, the front and oblique loads received by the side sill 11 can be efficiently transmitted to the floor tunnel 15 by the first and second cross members 17 and 19. Also, the first and second cross members 17 and 19 can efficiently receive the load at the time of collision.

  Further, since the first cross member 17 and the side sill 11 are connected at the connecting position of the side sill 11 and the center pillar 25, the impact at the side collision received by the center pillar 25 is caused via the first cross member 17. Can be transmitted to the floor tunnel 15 efficiently. Further, the impact at the side collision received by the center pillar 25 can be more reliably received by the first cross member 17. Furthermore, since the other end of the first cross member 17 extends obliquely forward of the vehicle, it is possible to secure a wider space for placing the legs of the rear seat occupant.

  Further, since the first cross member 17 and the second cross member 19 are arranged so as to form an X-shape, the load received by the side sill 11 at the time of impact is such that the first cross member 17 and the second cross member 19 It is efficiently transmitted by the two cross members 19 and the load applied to the vehicle can be dispersed. Therefore, relative displacement between the side sill 11 and the floor tunnel 15 and deformation of the floor panel can be suppressed.

(Second Embodiment)
FIG. 8 is a schematic configuration diagram of a vehicle floor structure according to the second embodiment of the present invention. In the WLH orthogonal coordinate system shown in the drawings, the W direction indicates the vehicle width direction, the L direction indicates the vehicle longitudinal direction, and the H direction indicates the vehicle upward direction. An arrow Y indicates the front direction of the vehicle.

  The floor structure of the vehicle according to the second embodiment differs from the first embodiment in the arrangement positions of the first and second cross members. That is, the floor structure of the vehicle according to the second embodiment is replaced with the first and second cross members 17 and 19 included in the floor structure of the vehicle according to the first embodiment. , 20. In addition, the vehicle floor structure according to the second embodiment includes a pair of side sills 11, a floor panel 13, a floor tunnel 15, and a floor cloth 21, as in the first embodiment. Further, the front pillar 23 and the center pillar 25 are connected to the side sill 11 as in the first embodiment.

  One end of each of the two first cross members 18 is connected to the pair of side sills 11, and the other end extends obliquely forward of the vehicle and is connected to the floor tunnel 15. Each first cross member 18 is disposed on the floor panel 13. That is, the first cross member 18 is disposed such that the longitudinal direction intersects the longitudinal direction of the pair of side sills 11 and the floor tunnel 15.

  One end of each of the two first cross members 18 is connected to the side sill 11 at a position where the center pillar 25 is connected to the corresponding side sill 11. One end of each of the two first cross members 18 is connected to the side sill 11 at a position corresponding to the region 30 of the floor panel 13 in the vehicle longitudinal direction.

  One end of each of the two second cross members 20 is connected to the front side of the side sill 11 from the connection point between the side sill 11 and the first cross member 17, and the other end extends obliquely rearward of the vehicle. It is connected to. Each second cross member 20 is disposed on the floor panel 13. That is, the second cross member 20 is disposed such that the longitudinal direction intersects the longitudinal direction of the pair of side sills 11 and the floor tunnel 15.

  The other end of the first cross member 18 and the other end of the second cross member 20 are connected to the side sill 11 and to each other. That is, the first cross member 18 and the second cross member 20 are disposed so as to form a V shape when viewed from above the vehicle.

  In the vehicle floor structure of the present embodiment, one end of the first cross member 18 is connected to the side sill 11, the other end extends obliquely forward of the vehicle and is connected to the floor tunnel 15, and one end of the second cross member 20 is connected to the side sill 11. Since it is connected to the side sill 11 and the other end extends obliquely rearward of the vehicle and is connected to the floor tunnel 15, an input load component transmitted along the front-rear direction of the side sill 11 is provided obliquely with respect to the side sill 11. The first and second cross members 18 and 20 are dispersed and transmitted to the floor tunnel 15 via the first and second cross members 18 and 20. Therefore, the load from the front surface and the oblique direction at the time of the collision received by the side sill 11 can be efficiently transmitted to the floor tunnel 15 by the first and second cross members 18 and 20. Moreover, the load at the time of a collision can be received efficiently by the first and second cross members 18 and 20.

  Further, since the first cross member 18 and the side sill 11 are connected at the connecting position of the side sill 11 and the center pillar 25, the impact at the side collision received by the center pillar 25 is caused via the first cross member 18. Can be transmitted to the floor tunnel 15 efficiently. Further, the impact at the side collision received by the center pillar 25 can be more reliably received by the first cross member 18. Furthermore, since the other end of the first cross member 18 extends obliquely forward of the vehicle, a wider space can be secured for the rear seat occupant's feet.

  Also, the other end of the first cross member 18 is connected to the other end of the second cross member 20 so that the first cross member 18 and the second cross member 20 form a V-shape. Therefore, the load received by the side sill 11 at the time of impact is efficiently transmitted by the first cross member 18 and the second cross member 20, and the load applied to the vehicle can be dispersed. Therefore, relative displacement between the side sill 11 and the floor tunnel 15 and deformation of the floor panel can be suppressed.

  Each embodiment mentioned above shows an example of the floor structure of vehicles concerning the present invention. The vehicle floor structure according to the present invention is not limited to such a structure, and may be modified so as not to change the gist described in each claim.

  For example, the first cross members 17 and 18 and the second cross members 19 and 20 may be connected to the side sill 11 and the floor tunnel 15 by bolts. The first cross members 17 and 18 and the second cross members 19 and 20 may be formed integrally with the floor panel 13. Further, the first cross members 17 and 18 and the second cross members 19 and 20 may be formed integrally or may be formed as separate members.

It is a composition outline figure of the floor structure of vehicles concerning a 1st embodiment of the present invention. It is sectional drawing which shows the II-II sectional structure of FIG. It is explanatory drawing about the load transmission at the time of the front collision in the floor structure of FIG. It is explanatory drawing about the shear load at the time of the front collision in the floor structure of FIG. It is explanatory drawing about the load transmission at the time of the side collision in the floor structure of FIG. It is explanatory drawing about the load at the time of the side collision in the floor structure of FIG. It is explanatory drawing about the load at the time of the side collision in the floor structure of FIG. It is a composition schematic diagram of the floor structure of vehicles concerning a 2nd embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Side sill, 13 ... Floor panel, 15 ... Floor tunnel, 17, 18 ... First cross member, 19, 20 ... Second cross member, 21 ... Floor cross, 23 ... Front pillar, 25 ... Center pillar

Claims (4)

A floor panel constituting the floor of the vehicle;
A floor tunnel formed in the floor panel and extending in the vehicle front-rear direction at the center in the vehicle width direction;
A side sill formed on a side of the floor panel and extending in a direction parallel to the floor tunnel;
A first cross member having one end connected to the side sill and the other end extending obliquely forward of the vehicle and connected to the floor tunnel;
A second cross member, one end of which is connected to the side sill on the vehicle front side from the connection point between the first cross member and the side sill, and the other end is connected to the floor tunnel extending obliquely rearward of the vehicle;
Vehicle floor structure with   2. The vehicle floor structure according to claim 1, wherein the first cross member and the side sill are connected at a connection position between the side sill and the center pillar.   3. The vehicle floor structure according to claim 1, wherein the first cross member and the second cross member are arranged so as to form an X shape. 4. The vehicle floor structure according to claim 1, wherein the other end of the first cross member is connected to the other end of the second cross member.

Images