JP6649794B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure below a passenger compartment.

  As a vehicle body structure below a passenger compartment, there is known a vehicle body structure in which a substantially rectangular bracket having an integral structure is coupled to a floor panel and left and right side sills, and the bracket supports left and right seats for seating a passenger ( Patent Document 1).

  In the vehicle body structure described in Patent Literature 1, a bracket having an integral structure is disposed on a floor panel, and the bracket is a pair of front and rear cross members extending in the vehicle width direction across right and left over a tunnel portion of the floor panel. The vehicle includes a member portion, and a pair of left and right side member portions extending in the vehicle front-rear direction along the side sill in the left and right directions in the vehicle width direction. The front and rear cross members of the bracket are joined to the upper surface of the floor panel, and the left and right side members are joined to the inner side surface of the side sill in the vehicle width direction. Each of the front and rear cross member portions is provided with a seat support portion that supports a lower end of a left and right occupant seat.

JP-A-63-193988

  In the vehicle body structure described in Patent Literature 1, since the lower ends of the left and right seats are supported by the vehicle body via a substantially rectangular bracket having an integral structure, the left and right seats can be accurately assembled to the vehicle body. However, in the case of the vehicle body structure described in Patent Literature 1, the front cross member portion and the rear cross member portion of the bracket are connected to each other only by the side member portion on the outer side in the vehicle width direction. For this reason, it is difficult for the bracket to efficiently suppress deformation of the floor panel when an impact load is input from the front and rear direction of the vehicle body. Therefore, in the vehicle body structure described in Patent Literature 1, other floor reinforcing means must be added.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle body structure capable of accurately assembling left and right seats to a vehicle body and effectively suppressing deformation of a floor panel when a load is input from the vehicle front-rear direction. .

The vehicle body structure according to the present invention employs the following configuration in order to solve the above problems.
That is, the vehicle body structure according to the present invention includes a pair of left and right side sills (for example, the side sill 2 in the embodiment) disposed substantially along the vehicle body front-rear direction below the left and right side portions of the vehicle body, and the left and right floor portions in the vehicle width direction. A floor panel (for example, the floor panel 3 of the embodiment) having a (for example, the floor portion 3A of the embodiment) and a tunnel portion (for example, the tunnel portion 3B of the embodiment) protruding upward at substantially the center in the vehicle width direction; A pair of left and right front floor cross members (e.g., a pair of left and right front side cross members) which are disposed substantially along the vehicle width direction on the upper surface of the left floor portion and the upper surface of the right floor portion and whose outer ends are coupled to the corresponding left and right side sills. The front floor cross member 4 of the embodiment, and a front connection frame (for example, an implementation) that is connected to the left and right front floor cross members across the left and right of the tunnel portion. 5) and an upper surface of the left floor portion and an upper surface of the right floor portion on the rear side of the front floor cross member, substantially along the vehicle width direction, and the outer ends of the left and right outer cross members are left and right. A pair of left and right rear floor cross members (e.g., the rear floor cross member 10 of the embodiment) coupled to the corresponding side sills, and the left and right rear floor cross members straddling the upper part of the tunnel portion. A rear connection frame (for example, the rear connection frame 11 of the embodiment) coupled to the upper surface of the floor unit on the left side and the upper surface of the floor unit on the right side, and are disposed substantially along the vehicle front-rear direction. A pair of left and right floor frames (e.g., the floor frame of the embodiment) are connected to a pair of front side frames (e.g., the front side frame 14 of the embodiment). 12), and the left and right front floor cross members and the left and right rear floor cross members support the lower ends of the left and right seats for occupant seating on the outside in the vehicle width direction (for example, seat outside support portions (for example, The front connection frame and the rear connection frame have a seat outside support portion 9) of the embodiment, and the front connection frame and the rear connection frame support the lower ends of the left and right seats on the inside in the vehicle width direction. The floor frame on the left side is connected to the front floor cross member on the left side and the rear floor cross member on the left side, and the floor frame on the right side is the front floor on the right side. A cross member is coupled to the right rear floor cross member, and is disposed substantially along the vehicle body front-rear direction at left and right corners of the upper surface of the tunnel portion. A pair of left and right reinforcing plates (e.g., the embodiment) having a substantially L-shaped cross section having an upper wall (e.g., the upper wall 15A of the embodiment) and a side wall (e.g., the side wall 15B of the embodiment) joined to the surface and the side surface. At least one of the front connection frame and the rear connection frame is provided on a vertical wall (for example, the vertical wall 5A of the embodiment) that intersects with the tunnel portion, and the upper surface of the tunnel portion and the right and left Has a downward substantially U-shaped opening (for example, the opening 16 of the embodiment) which is arranged to face the side surface of the vertical wall, and an upper edge of the opening of the vertical wall is formed of the reinforcing plate. An upper surface joining flange (for example, the upper surface joining flange 5A-2 of the embodiment) to be joined to the upper surface of the upper wall, a main body portion of the vertical wall (for example, the main body portion 5A-1 of the embodiment) and the upper surface joining flange. First arc portion to be connected (for example, 1A arc portion 5A-3), and a side edge of the opening of the vertical wall is joined to a side surface joining flange (for example, the side joining flange 5A of the embodiment) joined to a side surface of the side wall of the reinforcing plate. -4), and a second arc portion (for example, the second arc portion 5A-5 of the embodiment) connecting the main body portion of the vertical wall and the side surface joining flange, and the opening portion of the vertical wall. A portion between the upper edge and the side edge connects the first arc portion and the second arc portion, and has a larger radius of curvature than the first arc portion and the second arc portion. It is characterized by having an arc portion (for example, the third arc portion 5A-6 of the embodiment) .

  In the case of this vehicle body structure, the left and right front floor cross members connected to each other by the front connection frame and the left and right rear floor cross members connected to each other by the rear connection frame substantially extend in the vehicle front-rear direction. Because it is connected to a pair of left and right extending floor frames, the impact load in the front-rear direction of the vehicle input to the front side frame can be transmitted through the left and right front floor cross members and the left and right rear floor cross members from the floor frame. Will be transmitted to the side sill. For this reason, it is difficult for the impact load in the vehicle longitudinal direction to be directly input to the center area of the floor panel in the vehicle width direction. In this vehicle body structure, the lower ends of the left and right seats are supported by the front floor cross member, the front connection frame, the rear floor cross member, and the rear connection frame that are integrally assembled with high rigidity. The seat will be assembled to the vehicle body with high accuracy.

  In this case, at least one of the vertical walls of the front connection frame and the rear connection frame has an upper surface joining flange at an upper edge of the opening joined to an upper wall of a reinforcing plate arranged at a corner of the tunnel portion, A side surface joining flange at a side edge of the opening is joined to a side wall of the reinforcing plate. And, between the main body portion of the vertical wall and the upper surface joining flange and between the main body portion of the vertical wall and the side surface joining flange are respectively connected by a first arc portion and a second arc portion having a small radius of curvature, In each case, the rigidity against bending and twisting is maintained high. Further, since the first arc portion and the second arc portion are connected by the third arc portion having a larger radius of curvature than the first arc portion and the second arc portion, the first arc portion and the second arc portion are connected. Even if the radius of curvature of the arc portion is set small, the third arc portion is less likely to deteriorate during molding or the like. Therefore, by employing this structure, the impact load inputted from the front of the vehicle body through the tunnel portion can be efficiently dispersed and supported by the front floor cross member and the rear floor cross member.

  The reinforcing plate disposed on the front side of the front connection frame of the tunnel portion is configured by a thin plate reinforcing plate made of a high-strength steel plate, and the reinforcement plate is disposed on the rear side of the front connection frame of the tunnel portion. The reinforcing plate may be made of a steel plate having a lower strength than the thin plate reinforcing plate and a thicker reinforcing plate thicker than the thin plate reinforcing plate.

  In this case, on the front side of the front connection frame, since the corners of the tunnel portion are reinforced by the thin reinforcing plate made of a high-strength steel plate, both the weight reduction and the improvement of the load distribution performance are achieved by the thin reinforcing plate. be able to. In addition, on the rear side of the front connection frame, the corners of the tunnel portion are made of low-strength steel plate and reinforced by a thick plate reinforcing plate. Maintenance can be compatible.

The rear end of the floor frame includes a joining flange (eg, an upper joining flange 12A of the embodiment) joined to a front wall (eg, the front wall 10A of the embodiment) of the rear floor cross member. The front wall of the side floor cross member has a bulging portion (for example, the bulging portion 17 of the embodiment) at a portion facing the rear end of the floor frame, and the bulging portion has outer sides at left and right side portions. It may have an inclined wall inclined backward (for example, the inclined wall 17B of the embodiment), and the inclined wall may be a joining portion joined to the joining flange of the floor frame.
In this case, the impact load input from the front of the vehicle through the floor frame is efficiently transmitted to the front wall of the rear floor cross member through the inclined wall of the bulging portion of the rear floor cross member. In addition, since the joint flange at the rear end of the floor frame is joined to the rear floor cross member with an inclined wall, it can be easily welded with a pinch-type spot gun to avoid interference with the floor frame during manufacturing. Can be fixed.

  A pair of left and right tunnel frames (for example, the tunnel frame 19 of the embodiment) disposed substantially along the vehicle longitudinal direction at positions adjacent to the tunnel portion on the lower surfaces of the left and right floor portions; A reinforcing member in a tunnel (for example, the reinforcing member in a tunnel 20 of the embodiment) disposed at an extension position on the inner side in the vehicle width direction of the front floor cross member. May be joined to the corresponding left and right front floor cross members above the left and right tunnel frames, respectively.

  In this case, in the tunnel portion, the left and right front floor cross members are reinforced by the reinforcing members in the tunnel in the vehicle width direction inside, and the left and right sides of the tunnel portion are reinforced by the left and right tunnel frames, and the upper side of the tunnel portion is reinforced by the left and right tunnel frames. It will be reinforced by the front connection frame that straddles the tunnel part from side to side. Thereby, the inside and the outside of the tunnel portion are efficiently reinforced, and the deformation of the tunnel portion in the opening direction and the closing direction is suppressed. Therefore, by adopting this structure, it is possible to reduce the vibration of the floor portion when the vehicle travels.

  The left and right floor portions have floor protrusions (for example, the floor protrusion 3A-1 of the embodiment) that protrude upward with respect to the vehicle width direction outer region at positions adjacent to the tunnel portion, and the floor protrusions are provided. The portion may be configured to have substantially the same height as the upper surface of the floor frame, and the tunnel frame may be arranged on the lower surface of the floor raised portion.

  In this case, a floor protruding portion having substantially the same height as the upper surface of the floor frame is disposed at a position adjacent to the tunnel portion, and the tunnel frame is disposed on the lower surface of the floor protruding portion. The front floor cross member can be held by a sufficient cross-sectional height of the inner region in the vehicle width direction and the tunnel frame. Therefore, the rigidity of the outside of the tunnel portion in the vehicle width direction can be maintained high, and the vibration of the floor portion during the traveling of the vehicle can be more effectively reduced. In addition, since the raised portion of the floor is substantially the same height as the upper surface of the floor frame, and the lower surface of the tunnel frame disposed on the lower surface can be made higher, the space below the tunnel frame is effective as a space for arranging vehicle-mounted components. Can be used.

  The floor frame may have a concave groove (for example, the concave groove 18 of the embodiment) or a ridge on the upper surface which is substantially along the vehicle longitudinal direction.

  In this case, the rigidity of the floor frame against bending and twisting is increased by the concave groove or the ridge provided on the upper surface of the floor frame. Therefore, the impact load input from the front side frame to the floor frame can be more efficiently transmitted to the side sill.

  A pair of left and right outdoor floor frames (for example, the outdoor floor frame 22 of the embodiment) are disposed at positions below the left and right floor frames so as to sandwich the floor portion and extend substantially along the vehicle longitudinal direction. The outdoor floor frame may have a front portion coupled to the left and right front side frames and a rear portion coupled to the left and right rear side frames at the rear of the vehicle body.

  In this case, since the outdoor floor frame whose front portion is connected to the front side frame is connected to the rear side frame at the rear side, the impact load input to the front side frame can be transmitted to the rear of the vehicle body via the outdoor floor frame. Can be transmitted to the rear side frame. Therefore, by adopting this configuration, it is possible to further suppress the deformation of the floor panel when an impact load is input.

The front connection frame and the rear connection frame may have a configuration including the seat inner support portion and a mounting portion of a vehicle-mounted component other than the seat (for example, the mounting portion 7 of the embodiment).
In this case, since the front connection frame and the rear connection frame also serve as mounting portions for vehicle components other than the seat, the number of components such as brackets for mounting the vehicle components can be reduced.

  According to the present invention, the left and right front floor cross members interconnected by the front connection frame and the left and right rear floor cross members interconnected by the rear connection frame substantially extend in the vehicle longitudinal direction. A rigid assembly is formed by being connected to the pair of left and right floor frames extending, and the left and right front floor cross members, the front connection frame, the rear floor cross member, and the rear connection frame on the assembly are provided. The lower end of the seat is supported. Therefore, the left and right seats can be accurately assembled to the vehicle body, and the deformation of the floor panel when an impact load is input from the vehicle front-rear direction can be effectively suppressed by the highly rigid assembly.

FIG. 2 is a plan view showing a skeleton portion below a passenger compartment of the vehicle according to the embodiment of the present invention. FIG. 1 is a perspective view showing a skeleton portion below a passenger compartment of a vehicle according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the vehicle according to the embodiment of the present invention, taken along line III-III of FIG. 1. FIG. 4 is a cross-sectional view of the vehicle according to the embodiment of the present invention, taken along line IV-IV in FIG. 2. It is the figure which expanded and showed the V section of FIG. 2 of the vehicle which concerns on one Embodiment of this invention. FIG. 5 is an enlarged view of a portion VI of FIG. 2 of the vehicle according to the embodiment of the present invention. FIG. 7 is a perspective view showing a state in which some parts of FIG. 6 have been removed. FIG. 7 is a cross-sectional view of the vehicle according to the embodiment of the present invention, taken along line VIII-VIII of FIG. 6.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram of a skeleton portion below a passenger compartment of a vehicle 1 according to this embodiment as viewed from above, and FIG. 2 is a diagram of the skeleton portion as viewed from above a left front portion. FIG. 3 is a diagram showing a cross section along the line III-III in FIG. 1, and FIG. 4 is a diagram showing a cross section along the line IV-IV in FIG.
In a vehicle 1 according to this embodiment, a side sill 2 extending substantially along the vehicle front-rear direction is disposed below the left and right sides of the vehicle. The left and right ends of the floor panel 3 below the passenger compartment are joined to the inner surfaces of the left and right side sills 2 in the vehicle width direction.

  The floor panel 3 has left and right floor portions 3A in the vehicle width direction and a tunnel portion 3B substantially at the center in the vehicle width direction. The tunnel portion 3B projects a predetermined height upward from the left and right floor portions 3A. The tunnel portion 3B is formed to have a substantially U-shaped cross-section that opens downward from the vehicle body.

  On the upper surface of the left floor portion 3A and the upper surface of the right floor portion 3A of the floor panel 3, a front floor cross member 4 extending substantially along the vehicle width direction is arranged. The front floor cross member 4 is formed in a hat-shaped cross-section that opens downward, and the outer end in the vehicle width direction is joined to the corresponding left and right side sills 2. The end of the front floor cross member 4 on the inner side in the vehicle width direction is joined to the outer side surface of the tunnel portion 3B or is arranged to face the outer side surface.

The portions of the left and right front floor cross members 4 that are closer to the inside in the vehicle width direction are connected to each other by a front connection frame 5 that is disposed over the tunnel portion 3B on the left and right sides. The front connection frame 5 is formed in a horizontally elongated box shape with an open lower part, and lower edges thereof are joined to the left and right front floor cross members 4 and the tunnel part 3B. At both left and right edges of the upper wall of the front connection frame 5, seat inner support portions 6 are provided for supporting lower ends of left and right seats (not shown) for occupant seating in the vehicle width direction. The seat inner support portion 6 is, for example, a support hole for fastening and fixing the lower end of the seat, a reinforcing portion thereof, a fastening member, and the like.
Further, a mounting portion 7 for mounting a vehicle-mounted component other than a seat, such as a console box, is provided on the upper wall of the front connection frame 5 at a position inside the seat inner support portion 6 in the vehicle width direction.

  A box-shaped support 8 protrudes from the upper wall of the left and right front floor cross members 4 on the outer side in the vehicle width direction. The upper wall of the support base 8 is provided with a seat outer support portion 9 for supporting the lower ends of the left and right seats for occupant seating on the outside in the vehicle width direction. The seat outer support portion 9 is, for example, a support hole for fastening and fixing the lower end of the seat, a reinforcing portion thereof, a fastening member, and the like.

  On the upper surface of the left floor portion 3A and the upper surface of the right floor portion 3A of the floor panel 3, on the rear side of the front floor cross member 4, a rear floor cross member 10 extending substantially in the vehicle width direction. Is arranged. The rear floor cross member 10 is formed in a hat-shaped cross-sectional shape that opens downward similarly to the front floor cross member 4, and the outer ends in the vehicle width direction are joined to the corresponding left and right side sills 2. An end of the rear floor cross member 10 on the inner side in the vehicle width direction is joined to an outer side surface of the tunnel portion 3B, or is disposed to face the outer side surface.

The portions of the left and right rear floor cross members 10 that are closer to the inside in the vehicle width direction are interconnected by a rear connection frame 11 that is disposed over the tunnel portion 3B on the left and right sides. Like the front connection frame 5, the rear connection frame 11 is formed in a horizontally elongated box shape with an open lower part, and lower edges are joined to the left and right rear floor cross members 10 and the tunnel portion 3B. On both left and right edges of the upper wall of the rear connection frame 11, similarly to the front connection frame 5, a seat inner support portion 6 and a mounting portion 7 for a vehicle-mounted component other than the seat are provided.
A box-shaped support 8 protrudes from the upper wall of the left and right rear floor cross members 10 on the outer side in the vehicle width direction, and the support 8 has a vehicle width of the left and right seats for occupant seating. A seat outer supporting portion 9 that supports the lower end on the outside in the direction is provided.

  A floor frame 12 extending substantially along the vehicle front-rear direction is joined to the upper surface of the left floor portion 3A and the upper surface of the right floor portion 3A. The floor frame 12 is formed in a hat-shaped cross-sectional shape that opens downward, and is disposed between the tunnel portion 3B and the left and right side sills 2. The floor frame 12 is joined to the front floor cross member 4 while penetrating the lower edge of the front floor cross member 4 back and forth, and the rear end portion is abutted against the front wall of the rear floor cross member 10. At the rear floor cross member 10.

  Further, as shown in FIG. 3, the front end of the floor frame 12 is joined to a dashboard lower 13 which is a partition member at the front of the passenger compartment. A front side frame 14 that projects forward in the engine room is located on the front side of each of the left and right floor frames 12 with the dashboard lower 13 interposed therebetween. Therefore, the left and right floor frames 12 are continuous with the left and right front side frames 14 in the engine room in the front-rear direction with the dashboard lower 13 interposed therebetween.

FIG. 5 is an enlarged view of a portion V in FIG.
At the left and right corners on the upper surface side of the tunnel portion 3B, metal reinforcing plates 15 for reinforcing the corners are attached. The reinforcing plate 15 is formed in a substantially L-shaped cross section having an upper wall 15A and a side wall 15B joined to the upper surface and the side surface of the tunnel portion 3B. The material and thickness of the reinforcing plate 15 are different between those disposed on the front side of the front connection frame 5 and those disposed on the rear side of the front connection frame 5. Specifically, the reinforcing plate 15 disposed on the front side of the front connection frame 5 is configured by a thin plate reinforcing plate made of a high-strength steel plate, and the reinforcing plate 15 disposed on the rear side of the front connection frame 5 is And a thick plate reinforcing plate made of a steel plate having a lower strength than the thin plate reinforcing plate and having a greater thickness than the thin plate reinforcing plate.

  Here, as shown in FIG. 5, the lower edge of the front vertical wall 5A of the front connection frame 5 has a downward substantially rectangular shape through which the upper region (the upper surface and part of the left and right side surfaces) of the tunnel portion 3B is inserted. A letter-shaped opening 16 is formed. At the upper edge of the opening 16 of the vertical wall 5A, an upper surface joining flange 5A-2 which is joined to the upper surface of the tunnel portion 3B and the upper surface of the upper wall 15A of the reinforcing plate 15, and curves forward to the vertical wall 5A. A first arc portion 5A-3 that connects the main body portion 5A-1 of the vertical wall 5A and the upper surface joining flange 5A-2 is provided. Also, on the side edge of the opening 16 of the vertical wall 5A, a side surface joining flange 5A-4 joined to the side surface of the side wall 15B of the reinforcing plate 15, and a main body of the vertical wall 5A curved forward of the vertical wall 5A. A second arc portion 5A-5 that connects the portion 5A-1 and the side surface joining flange 5A-4 is provided. Further, in the region between the upper edge and the side edge of the opening 16 of the vertical wall 5A, the first arc portion 5A-3 and the second arc portion 5A-5 are curved along the bent portion of the reinforcing plate 15. And a third arc portion 5A-6 that curves forward with a radius of curvature larger than the radius of curvature of the first arc portion 5A-3 and the second arc portion 5A-5.

The upper edge of the vertical wall 5A is welded and fixed to the upper surface of the tunnel portion 3B and the upper surface of the upper wall 15A of the reinforcing plate 15 at the upper surface joining flange 5A-2. At the joining flange 5A-4, it is fixed to the outer surface of the side wall 15B of the reinforcing plate 15 by welding.
The rear vertical wall of the front connection frame 5 is fixed to the tunnel portion 3B and the reinforcing plate 15 by welding in the same manner as the front vertical wall 5A. Also, in the rear connection frame 11, a connection structure to the tunnel portion 3B similar to the front connection frame 5 may be adopted.

FIG. 6 is an enlarged view of a portion VI in FIG.
As shown in FIG. 6, the rear ends of the left and right floor frames 12 include an upper joint flange 12A (joint flange) and a side joint flange 12B joined to the front wall 10A of the rear floor cross member 10. ing. The upper joining flange 12A has a flat base wall 12A-1 and a pair of joining pieces 12A-2 inclined from both left and right sides of the base wall 12A-1 toward the outside and rear in the vehicle width direction. .

FIG. 7 is a view showing a state where the floor frame 12 of FIG. 6 is removed.
As shown in FIG. 7, the front wall 10 </ b> A of the rear floor cross member 10 is provided with a bulging portion 17 bulging toward the front side at a portion facing the rear end of each floor frame 12. The bulging portion 17 has a flat front wall 17A, and a pair of inclined walls 17B inclined from both left and right sides of the front wall 17A toward the outside rear in the vehicle width direction. The side joint flange 12B at the rear end of each floor frame 12 is welded and fixed to a position outside the bulging portion 17 in the front surface of the front wall 10A, and the upper joint flange 12A has left and right joint pieces 12A-2. The bulging portion 17 is fixed to the front surface of the corresponding inclined wall 17B by welding.

  Further, each floor frame 12 is formed in a hat-shaped cross-sectional shape in which the cross section in the extending direction opens downward, and as shown in FIG. 6, a lower flange portion 12C is welded to the upper surface of the floor portion 3A. Fixed.

  As shown in FIGS. 4 and 6, a concave groove 18 is formed on the upper surface of each floor frame 12 so as to extend substantially in the vehicle longitudinal direction. The rigidity of the upper wall of the floor frame 12 is increased by the concave groove 18. In this embodiment, the concave groove 18 is formed on the upper surface of the floor frame 12, but a ridge that extends substantially in the longitudinal direction of the vehicle body may be provided instead of the concave groove 18.

As shown in FIG. 4, a pair of right and left tunnel frames 19 extending substantially along the vehicle front-rear direction are arranged at positions adjacent to the tunnel portions 3B on the lower surfaces of the left and right floor portions 3A. Each tunnel frame 19 is formed in a hat-shaped cross-sectional shape that opens upward, and is fixed by welding to the lower surfaces of the corresponding left and right floor portions 3A. In the tunnel portion 3B, a reinforcement member 20 in the tunnel is joined to the left and right front floor cross members 4 at positions extending inward in the vehicle width direction. The in-tunnel reinforcing member 20 has a bulged portion 20a that comes into contact with the inner surface of the tunnel portion 3B, and the bulged portion 20a regulates a cross-sectional deformation of the tunnel portion 3B in the inward direction.
The front connecting frame 5 straddles the left and right above the tunnel portion 3B, and is joined to the corresponding left and right front floor cross members 4 above the left and right tunnel frames 19, respectively.
In the tunnel portion 3B, the same reinforcing member in the tunnel as described above is also joined to an extended position on the inner side in the vehicle width direction of the left and right rear floor cross members 10.

  As shown in FIG. 4, the left and right floor portions 3A are formed with floor raised portions 3A-1 that are raised upward with respect to the vehicle width direction outer region at positions adjacent to the tunnel portion 3B. The floor protrusion 3A-1 is formed at substantially the same height as the upper surface of the floor frame 12. The left and right corresponding tunnel frames 19 are welded and fixed to the lower surfaces of the left and right floor protrusions 3A-1. At the lower position straddling the left and right tunnel frames 19, the vehicle-mounted components 21 on the outside of the vehicle are arranged.

As shown in FIGS. 3 and 4, a pair of left and right outdoor floor frames 22 extending substantially along the vehicle front-rear direction is welded and fixed to the lower surfaces of the left and right floor portions 3A in the vehicle width direction outer region. I have. The outdoor floor frame 22 is formed to have a hat-shaped cross section that opens upward. The left and right outdoor floor frames 22 are arranged on the lower surface side of the floor portion 3A so as to face the corresponding left and right floor frames 12 with the floor portion 3A interposed therebetween. The front portions of the left and right outdoor floor frames 22 are connected to the rear ends of the corresponding left and right front side frames 14. The rear portions of the left and right outdoor floor frames 22 are connected to left and right rear side frames 24 that support rear floor panels 23 on the rear side of the vehicle body. The rear floor panel 23 is supported by the rear side frame 24 at a position one step higher than the front floor panel 3.
In FIGS. 1 and 2, reference numeral 30 denotes a fuel tank which is disposed behind the floor panel 3 and partially expands below the floor panel 3, and reference numeral 31 denotes a rear floor cross member 10. A cross member that connects the tunnel portion 3B and the left and right side sills 2 on the rear side.

  As described above, in the vehicle body structure of the vehicle 1 according to this embodiment, the left and right front floor cross members 4 are connected to each other by the front connection frame 5 and the left and right rear floor cross members 10 are connected to the rear connection. The left and right front floor cross members 4 and the left and right rear floor cross members 10 are interconnected by a frame 11, and are connected to corresponding left and right floor frames 12 extending substantially along the vehicle longitudinal direction. Therefore, when an impact load in the front-rear direction is input to the front side frame 14 at the front of the vehicle body, the impact load is transmitted from the left and right floor frames 12 via the front floor cross member 4 and the rear floor cross member 10 to the left and right. It is smoothly transmitted to the side sill 2. Therefore, in the vehicle body structure according to this embodiment, the impact load in the front-rear direction is unlikely to be directly input to the floor panel 3, and the deformation of the floor panel 3 when the impact load is input can be suppressed.

  Further, in the vehicle body structure according to this embodiment, the left and right front floor cross members 4 mutually connected by the front connection frame 5 and the right and left rear floor cross members 10 mutually connected by the rear connection frame 11. Are connected to each other by a pair of left and right floor frames 12 extending in the front-rear direction of the vehicle body to form a highly rigid assembly. The lower ends of the left and right sheets are supported by the rigid assembly. Therefore, when the vehicle body structure according to this embodiment is adopted, the left and right seats can be assembled to the vehicle body with high accuracy.

In the vehicle body structure according to this embodiment, the opening 16 is provided in the vertical wall 5A of the front connection frame 5, and the upper surface joining flange 5A-2 on the upper edge of the opening 16 is formed at the corner of the tunnel 3B. While being joined to the upper wall 15A of the reinforcing plate 15, the side joining flange 5A-4 on the side edge of the opening 16 is joined to the side wall 15B of the reinforcing plate 15. A first arc having a small radius of curvature is provided between the main body 5A-1 of the vertical wall 5A and the upper surface joining flange 5A-2 and between the main body 5A-1 of the vertical wall 5A and the side joining flange 5A-4. The portion 5A-3 and the second arc portion 5A-5 are connected to each other. Therefore, the rigidity of the connecting portion between the vertical wall 5A and the tunnel portion 3B (the reinforcing plate 15) is kept high.
Further, in the vehicle body structure according to this embodiment, a portion between the first arc portion 5A-3 and the second arc portion 5A-5 of the vertical wall 5A is compared with the first arc portion 5A-3 and the second arc portion 5A-5. And are connected by a third arc portion 5A-6 having a large radius of curvature. For this reason, even if the radius of curvature of the first arc portion 5A-3 and the second arc portion 5A-5 is set small, the third arc portion 5A-6 is unlikely to deteriorate during molding or the like. Therefore, when the vehicle body structure according to this embodiment is employed, when an impact load is input from the front of the vehicle body through the tunnel portion 3B, the impact load is transmitted through the front floor cross member 4 and the rear floor cross member 10 to the left and right. Can be efficiently dispersed and supported by the side sill 2.

  Further, in the vehicle body structure according to this embodiment, the reinforcing plate 15 for reinforcing the tunnel portion, which is disposed on the front side of the front connecting frame 5, is constituted by a thin reinforcing plate made of a high-strength steel plate, and the rear of the front connecting frame 5. The reinforcing plate 15 for reinforcing the tunnel portion arranged on the side is made of a thick plate reinforcing plate made of a steel plate having lower strength than the thin plate reinforcing plate and having a thickness greater than the thin plate reinforcing plate. Therefore, when the vehicle body structure according to this embodiment is adopted, the front side of the front connection frame 5 can achieve both the weight reduction and the improvement of the load distribution performance by the high-strength thin plate reinforcing plate. On the rear side of the connection frame 5, a low-strength thick plate reinforcing plate can achieve both reduction in product cost and maintenance of rigidity.

  Further, in the vehicle body structure according to this embodiment, the rear ends of the left and right floor frames 12 include an upper joint flange 12A and a side joint flange 12B joined to the front wall 10A of the rear floor cross member 10, The front wall 10 </ b> A of the rear floor cross member 10 has a bulging portion 17 at a position facing the rear end of the floor frame 12. On the left and right sides of the bulging portion 17, an inclined wall 17 </ b> B is formed that is inclined outward and rearward. It is fixed to the wall 17B by welding. Therefore, when an impact load is input from the front of the vehicle body through the floor frame 12, the impact load is efficiently applied to the front wall 10A of the rear floor cross member 10 through the inclined wall 17B of the bulging portion 17 of the rear floor cross member 10. Can be transmitted.

Further, in the case of the vehicle body structure according to this embodiment, the upper joint flange 12A at the rear end of the floor frame 12 is joined to the rear floor cross member 10 by the inclined wall 17B. Can be easily fixed by welding with a pinch-type spot gun while avoiding interference.
FIG. 8 is a diagram showing a state where the rear end of the floor frame 12 is welded to the front wall 10A of the rear floor cross member 10 by using a spot gun 32 of a sandwich type.
As shown in the figure, in the case of this embodiment, the welding portion between the rear portion of the floor frame 12 and the rear floor cross member 10 is inclined with respect to the general portion of the front wall 10A of the rear floor cross member 10. Therefore, the bent welding arm 32a of the spot gun 32 can be easily straddled over the flange portion 12C of the floor frame 12 and the like. Therefore, spot welding can be easily performed without causing interference between the spot gun 32 and the floor frame 12.

  Further, in the vehicle body structure according to this embodiment, a pair of left and right tunnel frames 19 is disposed at positions adjacent to the tunnel portion 3B on the lower surface of the left and right floor portions 3A, and the left and right front floor cross members in the tunnel portion 3B. 4, a reinforcement member 20 in the tunnel is disposed at an extended upper position in the vehicle width direction. The front connecting frame 5 is joined to the corresponding left and right front floor cross members 4 above the left and right tunnel frames 19, straddling the left and right over the tunnel portion 3B. For this reason, when the vehicle body structure according to this embodiment is employed, the inside and outside of the tunnel portion 3B can be efficiently reinforced and the deformation of the tunnel portion 3B in the opening direction and the closing direction can be suppressed. Therefore, it is possible to further reduce the vibration of the floor portion when the vehicle is running.

Further, in the vehicle body structure according to this embodiment, a floor raised portion 3A-1 having substantially the same height as the upper surface of the floor frame 12 is disposed at a position adjacent to the tunnel portion 3B, and is provided on the lower surface of the floor raised portion 3A-1. A tunnel frame 19 is provided. For this reason, the side of the tunnel portion 3B can be firmly held by the sufficient cross-sectional height H1 (see FIG. 4) in the vehicle width direction inner region of the front floor cross member 4 and the tunnel frame 19 therebelow. it can. Therefore, when the vehicle body structure according to this embodiment is employed, the rigidity of the outside of the tunnel portion 3B in the vehicle width direction can be maintained high, and the vibration of the floor portion during the traveling of the vehicle can be more effectively reduced.
Further, in the vehicle body structure according to this embodiment, since the floor protrusion 3A-1 is substantially the same height as the upper surface of the floor frame 12, the lower surface of the tunnel frame 19 disposed on the lower surface can be made higher. Therefore, the area below the tunnel frame 19 can be effectively used as a space for arranging the vehicle-mounted components 21.

  Further, in the case of the vehicle body structure of this embodiment, since the concave grooves 18 are formed on the upper surfaces of the left and right floor frames 12 along the vehicle longitudinal direction, the rigidity of the floor frames 12 against bending and twisting can be efficiently increased. it can. Therefore, the impact load input from the front side frame 14 to the floor frame 12 can be transmitted to the left and right side sills 2 more efficiently.

  Further, in the vehicle body structure according to the present embodiment, the outdoor floor frame 22 is opposed to the corresponding left and right floor frames 12 across the floor portion 3A on the lower surface of the left and right floor portions 3A on the outer side in the vehicle width direction. The front portion of the outdoor floor frame 22 is connected to the front side frame 14, and the rear portion of the outdoor floor frame 22 is connected to left and right rear side frames 24 at the rear of the vehicle body. Therefore, when this vehicle body structure is adopted, the impact load input to the front side frame 14 can be smoothly transmitted to the rear side frame 24 at the rear of the vehicle body via the outdoor floor frame 22, and the impact load from the front of the vehicle body can be reduced. The deformation of the floor panel 3 at the time of input can be more effectively suppressed.

  Furthermore, in the case of the vehicle body structure according to this embodiment, the front connection frame 5 and the rear connection frame 11 are provided with not only the seat inner support portion 6 but also the mounting portions 7 for vehicle-mounted components other than the seat. There is no need to separately add a bracket or the like for mounting components. For this reason, the number of parts can be reduced and the product cost can be reduced.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention.

2 ... side sill 3 ... floor panel 3A ... floor part 3A-1 ... floor raised part 3B ... tunnel part 4 ... front side floor cross member 5 ... front side connection frame 5A ... vertical wall 5A-1 ... main body part 5A-2 ... top surface joining flange 5A-3: first circular arc portion 5A-4: side joining flange 5A-5: second circular arc portion 5A-6: third circular arc portion 6: seat inner support portion 7: mounting portion 9: seat outer support portion 10: rear Side floor cross member 10A Front wall 11 Rear connection frame 12 Floor frame 12A Upper joint flange (joint flange)
DESCRIPTION OF SYMBOLS 14 ... Front side frame 15 ... Reinforcement plate 15A ... Upper wall 15B ... Side wall 16 ... Opening 17 ... Swelling part 17B ... Inclined wall 18 ... Concave groove 19 ... Tunnel frame 20 ... Tunnel reinforcement member 22 ... Outdoor floor frame 24 ... Rear side frame

Claims (8)

A pair of left and right side sills arranged substantially in the longitudinal direction of the vehicle below the left and right sides of the vehicle,
A floor panel having left and right floor portions in the vehicle width direction and a tunnel portion protruding upward at substantially the center in the vehicle width direction;
A pair of left and right front floor cross members disposed substantially along the vehicle width direction on the upper surface of the left floor portion and the upper surface of the right floor portion, and having outer ends coupled to the corresponding left and right side sills;
A front connecting frame that is connected to the left and right front floor cross members while straddling the upper part of the tunnel portion left and right,
On the rear side of the front floor cross member, on the upper surface of the left floor portion and on the upper surface of the right floor portion substantially along the vehicle width direction, outer ends are connected to the corresponding left and right side sills. A pair of left and right rear floor cross members,
A rear connecting frame that is connected to the left and right rear floor cross members while straddling the upper part of the tunnel portion left and right,
A pair of left and right floor frames that are disposed substantially along the vehicle front-rear direction on the upper surface of the left floor unit and the upper surface of the right floor unit, and whose front side is continuous with the pair of front side frames at the front of the vehicle body. ,
The left and right front floor cross members and the left and right rear floor cross members have seat outer support portions that support lower ends of left and right seats for occupant seating on the outside in the vehicle width direction,
The front connection frame and the rear connection frame have seat inner support portions that support lower ends of the left and right seats in the vehicle width direction,
The left floor frame is coupled to the left front floor cross member and the left rear floor cross member,
The right floor frame is coupled to the right front floor cross member and the right rear floor cross member ,
A pair of left and right reinforcements having a substantially L-shaped cross section, which are disposed substantially along the longitudinal direction of the vehicle body at left and right corners of the upper surface of the tunnel portion and have upper and side walls joined to the upper surface and side surfaces of the tunnel portion. Equipped with a board,
At least one of the front connection frame and the rear connection frame has a substantially U-shaped downward opening in which a vertical wall intersecting with the tunnel portion has an upper surface and left and right side surfaces of the tunnel portion facing each other. Part
An upper edge of the opening of the vertical wall, an upper surface joining flange joined to an upper surface of the upper wall of the reinforcing plate, a first arc portion connecting a main body portion of the vertical wall and the upper surface joining flange, Has,
A side edge of the opening of the vertical wall includes a side joining flange joined to a side surface of the side wall of the reinforcing plate, and a second arc portion connecting the main body of the vertical wall and the side joining flange. Have
A portion between the upper edge and the side edge of the opening of the vertical wall connects the first arc portion and the second arc portion, and is formed by the first arc portion and the second arc portion. Also having a third arc portion having a large radius of curvature. The reinforcing plate disposed on the front side of the front connection frame of the tunnel portion, is configured by a thin plate reinforcing plate made of high-strength steel plate,
The reinforcing plate disposed on the rear side of the front connection frame of the tunnel portion is made of a steel plate having a lower strength than the thin plate reinforcing plate, and is configured by a thick plate reinforcing plate having a plate thickness larger than the thin plate reinforcing plate. The vehicle body structure according to claim 1 , wherein: The rear end of the floor frame includes a joining flange joined to a front wall of the rear floor cross member,
The front wall of the rear floor cross member includes a bulging portion at a portion facing the rear end of the floor frame,
The bulging portion has an inclined wall that is inclined outward and rearward on left and right sides,
3. The vehicle body structure according to claim 1, wherein the inclined wall is a joint that is joined to the joint flange of the floor frame. A pair of left and right tunnel frames arranged substantially along the vehicle front-rear direction at positions adjacent to the tunnel section on the lower surfaces of the left and right floor sections,
In the tunnel portion, a reinforcing member in a tunnel disposed at an extended position on the inner side in the vehicle width direction of the left and right front floor cross members,
The front connecting frame, according to claim 1 to 3, characterized in that it is joined to the front floor cross member corresponding left and right above said tunnel frame left and right across the upper right and left of the tunnel portion The vehicle body structure according to claim 1. The left and right floor portions have floor raised portions that are raised upward with respect to the vehicle width direction outer region at positions adjacent to the tunnel portion,
The floor raised portion is configured to be substantially the same height as the upper surface of the floor frame,
The vehicle body structure according to claim 4 , wherein the tunnel frame is arranged on a lower surface of the floor protrusion. The vehicle body structure according to any one of claims 1 to 5 , wherein the floor frame has a concave groove or a ridge on an upper surface substantially along a vehicle front-rear direction. A pair of left and right outdoor floor frames arranged at lower positions sandwiching the floor portion of the left and right floor frames and extending substantially along the vehicle front-back direction,
The outdoor floor frame of the right and left are all with front is attached to said front side frame of the left and right, rear part of claim 1 to 6, characterized in that it is coupled to the left and right rear side frames of the vehicle body rear portion 2. The vehicle body structure according to claim 1. The rear connecting frame and the front connecting frame, and the seat inner support portion, to any one of claims 1 to 7, characterized in that it has a mounting portion of the vehicle component other than the sheet Body structure described.

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