JP4432543B2 - Lower body structure of vehicle and assembling method thereof - Google Patents

Description

  The present invention relates to a lower vehicle body structure for a vehicle, in which a floor tunnel that protrudes upward is provided on a floor panel that forms a lower surface of a passenger compartment, and a fuel tank is disposed in a space in the floor tunnel below the floor panel, and its assembly Regarding the method.

Conventionally, as the lower body structure of the vehicle of the above-described example, there is the following.
In other words, a tunnel portion projecting upward toward the vehicle interior side is provided at the center in the vehicle width direction of the floor panel that forms the lower surface of the vehicle interior, and the tunnel portion between the driver seat and the passenger seat is further expanded upward. A central bulge is formed to form a side bulge by bulging upward the floor panel at the lower part of the seat cushion of the driver's seat and the passenger's seat. A fuel tank is disposed so as to extend in the vehicle width direction and extend in the vehicle width direction outside the center bulging portion and the left and right side bulging portions described above (see Patent Document 1). .

  In this conventional structure, the fuel tank can be arranged by effectively using the dead space below the front seat (driver's seat and front passenger seat), so that a large living space can be secured even for a compact vehicle. On the other hand, since the fuel tank extends in the vehicle width direction, it is disadvantageous in the case of a side collision, and the floor panel provided with the tunnel portion, the central bulge portion, and the side bulge portion described above is relatively large and Due to its complexity, there was a problem of poor moldability.

On the other hand, as another structure of the lower body structure of the conventional vehicle, there is the following structure.
In other words, a tunnel part is provided at the center in the vehicle width direction of the floor panel that forms the lower surface of the passenger compartment and projects upward toward the passenger compartment side, and the lower part of the tunnel part is covered with the floor panel so as to be substantially flush with the floor panel. A member is provided, and a fuel tank extending in the front-rear direction of the vehicle is disposed between the cover member and the tunnel portion (see Patent Document 2).

  In this conventional structure, the fuel tank is disposed inside the tunnel portion so that it does not protrude below the floor panel. Therefore, in order to secure the tank capacity, the height of the tunnel portion in the vertical direction is high. Since the part is enlarged, there is a problem that the formability of the floor panel provided with such a tunnel part is poor.

JP 2000-85382 A Japanese Utility Model Publication No.59-78131

In view of this, the present invention provides a fuel tank in which a floor panel is divided into a plurality of flat portions integrally forming the bottom surface of a passenger compartment and a tunnel portion attached to the flat portion from below. Compared to form the underside of the passenger compartment by adopting a configuration where the modularized tunnel part and fuel tank are attached to the flat part from below by attaching the module from below the divided tunnel part and supporting it. Lower body structure of a vehicle that can form a floor panel while ensuring its formability, and improve the assembly of the fuel tank and the floor panel, even in a large and complex tunnel And an assembly method thereof.

In the lower vehicle body structure of the vehicle according to the present invention, a tunnel portion projecting upward toward the vehicle interior side is provided at the vehicle width direction central portion of the floor panel forming the vehicle compartment lower surface, and the tunnel under the floor panel is provided. A lower vehicle body structure of a vehicle in which a fuel tank is disposed in an inner space, wherein the floor panel is attached to a flat portion integrally forming a bottom surface of a vehicle compartment, and the flat portion from below. are formed by dividing a plurality of the tunnel portion, mounted from below the tunnel portion which is dividing the fuel tank supporting modularized, modular tunnel portion and the fuel tank is attached from below the flat portion It is a thing.

  According to the above configuration, since the floor panel is formed by dividing the floor panel into a plurality of tunnel portions and flat portions, the tunnel portion and the flat portion can be formed separately, and a relatively large size that forms the lower surface of the passenger compartment. And even if it is a complicated floor panel, a floor panel can be formed, ensuring the moldability of a tunnel.

  In addition, since the fuel tank is modularized and supported only in the divided tunnel portion, it is possible to improve the assembling property between the fuel tank and the floor panel.

  In one embodiment of the present invention, the divided tunnel portion has a shape in the vehicle width direction narrower in the rear portion than in the front portion, and the fuel tank corresponds to the shape of the tunnel portion. The shape in the vehicle width direction is such that the rear part is narrower than the front part.

  According to the above configuration, even if the shape of the fuel tank is somewhat complicated, the floor panel is divided into a plurality of tunnel portions and flat portions, so that these moldability is good and the shape of the tunnel portion and the fuel tank In particular, the shape in the vehicle width direction can ensure the tank capacity while minimizing the height in the vertical direction of the fuel tank, and can ensure the comfort in the vertical direction in the vehicle interior.

  In one embodiment of the present invention, the floor panel is provided with a cross member that extends in the vehicle width direction across the floor tunnel and overlaps into a plurality of divided flat portions and tunnel portions. is there.

According to the above configuration, even if the cross member is divided into the flat portion and the tunnel portion, the above-described cross member is superposed on both of them, so that the vehicle body rigidity can be ensured.
Assembling method of the lower body of the vehicle according to the present invention, tunnel portion which projects upwardly toward the vehicle interior side in the vehicle width direction central portion of the floor panel to form a cabin bottom surface is provided under the floor panel A method of assembling a lower vehicle body of a vehicle in which a fuel tank is disposed in the space in the tunnel, wherein the fuel tank is sub-assembled from below into a tunnel portion of a floor panel divided into a tunnel portion and a flat portion. And a forming step of forming a floor panel by connecting the tunnel portion from below the flat portion to a flat portion integrally forming the bottom surface of the passenger compartment .

According to the above configuration, the fuel tank is sub- assembled from below into the tunnel part of the floor panel divided into a plurality of tunnel parts and flat parts in the assembly process, and the tunnel part in which the fuel tank is sub-assembled in the forming process is The floor panel is formed by connecting to the flat portion from below .

  As described above, since the tunnel part and the flat part are divided into a plurality of parts, the tunnel part and the flat part can be formed separately, and the floor panel is a relatively large and complex floor panel that forms the lower surface of the passenger compartment. However, the floor panel can be established while ensuring the formability of the tunnel.

Also, in the assembly process, the fuel tank is assembled to the tunnel part from below, and in the next forming process, the tunnel part in which the fuel tank is sub-assembled is connected to the flat part from below, so that the fuel tank and the floor panel are assembled. It is possible to improve the attachment.

In one embodiment of the present invention, a cross member assembling step for assembling the cross member to the flat portion is provided prior to the assembly step.
According to the above configuration, by dividing the floor panel into the tunnel part and the flat part, an opening is formed in the flat part, and the rigidity of the flat part becomes weak, but the cross member is assembled to the flat part. The rigidity of the flat portion can be ensured, and as a result, the assemblability can be further improved.

In one embodiment of the present invention, the cross member is assembled so as to overlap with a flat portion and a tunnel portion divided into a plurality of portions.
According to the above configuration, even if the flat member and the tunnel member are divided, the above-described cross member is assembled so as to be superposed on both of them, so that the vehicle body rigidity can be ensured.

According to this invention, the floor panel is divided into a plurality of flat portions integrally forming the bottom surface of the passenger compartment and a tunnel portion attached to the flat portion from below, and a fuel tank is formed. supported by modular attached from below of the split tunnel portion, so modular tunnel portion and the fuel tank is attached from below the flat portion, a relatively large and so as to form a cabin bottom surface complex Even in a tunnel, the floor panel can be established while ensuring its formability, and the assembly of the fuel tank and the floor panel can be improved.

Even for relatively large and complex floor panels and floor tunnels that form the underside of the passenger compartment, the floor panel can be established while ensuring its formability, and the fuel tank and floor panel are assembled. The above-mentioned floor panel is formed by dividing the floor panel into a plurality of flat portions integrally forming the bottom surface of the passenger compartment and a tunnel portion attached to the flat portion from below. is to support and modularized attached from below the fuel tank divided tunnel portion, a modular tunnel portion and the fuel tank is achieved in the structure of Ru attached from below to the flat portion.

An embodiment of the present invention will be described in detail with reference to the drawings.
The drawings show a lower body structure of a vehicle and an assembling method thereof. First, the lower body structure of a vehicle will be described.
1 and 2, a dash lower panel (dash panel) 3 that partitions the engine room 1 and the vehicle compartment 2 in the front-rear direction is provided, and a floor panel 4 that forms the lower surface of the vehicle compartment 2 at the lower end of the dash lower panel 3. Are connected together.

The above-mentioned floor panel 4 extends substantially horizontally from the front portion toward the rear, and the rear floor panel 6 is integrally or integrally connected to the rear end portion of the floor panel 4 via the kick-up portion 5. A spare tire pan 7 is stepped down at the center of the rear floor panel 6.

Side sills 8 and 8 extending in the front-rear direction of the vehicle are provided at both left and right ends of the floor panel 4 described above, and floor frames 9 and 9 extending in the front-rear direction of the vehicle are joined and fixed to the lower surface of the floor panel 4. .
Further, as shown in FIGS. 1 and 2, a pair of left and right front side frames 10 and 10 (front frames) are provided as vehicle body rigid members extending forward from the dash lower panel 3 on both sides in the engine room 1. The front side frames 10 and 10 are provided along the lower surface of the dash lower panel 3 along the lower portion of the floor panel 4, and the above-described floor frame 9 is integrally or integrally attached to the extended end portion of the front side frame 10. .

Further, rear side frames 11 and 11 extending in the front-rear direction of the vehicle are joined and fixed to the left and right sides of the rear floor panel 6 described above, and the front end portions of the left and right rear side frames 11 and 11 are used as rear end portions of the side sills 8 and 8, respectively. It is connected.

  Rear floor frames 12 and 12 (see FIGS. 1 and 9) are provided along the side sills 8 and 8 between the cross members 21 and 17 described later on the lower surface of the floor panel 4 to improve the rigidity of the vehicle body. It is configured.

Here, the above-described side sill 8, floor frame 9, front side frame 10, rear side frame 11, and rear floor frame 12 are all vehicle body rigid members.
A tunnel T projecting upward toward the vehicle interior side is provided at the center in the vehicle width direction of the floor panel 4 that forms the lower surface of the vehicle interior 2. In this embodiment, FIG. 3 and FIG. As shown, the floor panel 4 is divided into a plurality of tunnel portions 13 (see FIG. 4) and flat portions 14 (see FIG. 3).

  First, the configuration of the flat portion 14 will be described with reference to FIG. 3. The floor panel 4 has a top deck surface between the dash lower panel 3 and the rear end of the cross member (so-called No. 2 cross member) 15. A floor tunnel 16 is integrally formed, and a floor tunnel 18 having a top deck surface is formed integrally with a cross member (so-called No. 3 cross member) 17 in a portion corresponding to the vertical direction.

An opening 19 corresponding to the shape of the tunnel portion 13 shown in FIG. 4 and an opening edge 20 that rises obliquely upward by a predetermined amount are formed between the front and rear floor tunnels 16 and 18.
The front floor tunnel 16, the opening edge portion 20, and the rear floor tunnel 18 are formed so as to extend in the vehicle front-rear direction from the dash lower panel 3 toward the kick-up portion 5. Wide portions 16a and 20a are formed, and rear portions of the wide portions 16a and 20a are provided with narrow portions 20c having a narrow width in the vehicle width direction via inclined portions 20b that are narrow toward the rear. A slim portion 20d having a smaller width in the vehicle width direction than the narrow portion 20c is formed.

Further , an inclined portion 16e whose width in the vehicle width direction becomes narrower forward and a slim portion 16f extending forward by a predetermined amount are formed at the front portion of the wide portion 16a.

The above-described cross member 15 extends in the vehicle width direction across the floor tunnel 16 at a position corresponding to the wide portion 16a, extends from the upper surface of the floor panel 4 to the left and right side sills 8, 8, and is a flat as shown in FIG. a part 14, and is provided so as to overlap the tunnel portion 13, as shown in FIG.

  The floor panel 4 has side sill inners 51 (on the left and right side sills 8, 8) at a position separated from the cross member 15 in the front-rear direction of the vehicle, specifically, at a position corresponding to the narrow portion 20 c of the opening edge 20. Cross members 21 and 21 (so-called No. 2.5 cross members) are provided as vehicle body rigid members that connect between the narrow portions 20c and 20c (see FIG. 7).

On the other hand, the above-described cross member 17 (No. 3 cross member) extends in the vehicle width direction across the floor tunnel 18 at a position corresponding to the floor tunnel 18 at the rear end of the slim portion 20d. To the left and right side sills 8, 8, and provided so as to overlap with the flat portion 14 and the tunnel portion 13.

  Here, the cross members 15, 21, and 17 described above have a hat shape in cross section, and between the cross members 15, 21, and 17 and the floor panel 4, closed cross sections 15 </ b> A, 21 </ b> A that extend in the vehicle width direction. , 17A are formed respectively.

  In addition, a tunnel on the floor side along the left and right sides of the opening edge portion 20 is provided between the cross members 15 and 21 spaced apart from each other in the front-rear direction (between the No. 2 cross member 15 and the No. 2.5 cross member 21). Side members 22 and 22 (so-called tunnel side member upper) are provided, and the left and right tunnel side members 22 and 22 are bonded and fixed to the floor panel 4 and the opening edge 20.

  Similarly, between the cross members 21 and 17 that are spaced apart in the front-rear direction (between the No. 2.5 cross member 21 and the No. 3 cross member 17), the floor side along the left and right sides of the opening edge 20 is provided. Tunnel side members 23 and 23 (so-called tunnel side member upper) are provided, and the left and right tunnel side members 23 and 23 are bonded and fixed to the floor panel 4 and the opening edge portion 20.

Next, the configuration of the tunnel unit 13 will be described with reference to FIG.
As shown in the figure, the tunnel portion 13 is formed with a wide portion 13a having a large width in the vehicle width direction at a front portion thereof, and an inclined portion 13b having a narrow width toward the rear at the rear portion of the wide portion 13a. A narrow portion 13c having a narrow width in the vehicle width direction and a slim portion 13d having a smaller width in the vehicle width direction than that of the narrow portion 13c are formed, and flange portions are provided at both left and right lower ends. 13f is integrally formed over the entire length.

A tunnel front member 24 (so-called tunnel member inner) having a hat-shaped cross section is joined to a portion corresponding to the front portion of the wide portion 13a on the lower surface of the tunnel portion 13 described above. The tunnel front member 24 is a member that connects the open side of the tunnel portion 13 to the left and right flange portions 13f and 13f in the vehicle width direction at a position corresponding to the cross member 15, and the tunnel portion 13 and the tunnel front member 24 A closed section 25 (see FIG. 5) extending in the vehicle width direction is formed between the two.

A tunnel intermediate member 26 (so-called tunnel member inner) having a hat-shaped cross section is joined to an intermediate corresponding portion of the narrow portion 13c on the lower surface of the tunnel portion 13 described above. The tunnel intermediate member 26 is a member that connects the open side of the tunnel portion 13 to the left and right flange portions 13f and 13f in the vehicle width direction at a position corresponding to the cross member 21, and includes the tunnel portion 13 and the tunnel intermediate member 26. A closed section 27 (see FIG. 7) extending in the vehicle width direction is formed between the two.

  A tunnel rear member 28 (so-called tunnel member inner) having a hat-shaped cross section is joined to a portion corresponding to the rear portion of the slim portion 13d on the lower surface of the tunnel portion 13 described above. The tunnel rear member 28 is a member that connects the open side of the tunnel portion 13 to the left and right flange portions 13f and 13f in the vehicle width direction at a position corresponding to the cross member 17, and includes the tunnel portion 13 and the tunnel rear member 28. A closed cross section extending in the vehicle width direction is formed between the two.

  Further, between the tunnel front member 24 and the tunnel intermediate member 26 which are provided apart from each other in the front-rear direction, tunnel side members 29 and 29 (so-called tunnel side members) on the tunnel portion 13 side along the lower surfaces of the left and right flange portions 13f. (See FIG. 6), and each of the tunnel side members 29, 29 is joined and fixed to the flange portion 13f.

  Similarly, tunnel side members 30 and 30 (so-called tunnel side members) on the tunnel portion 13 side are provided along the lower surfaces of the left and right flange portions 13f between the tunnel intermediate member 26 and the tunnel rear member 28 that are provided apart from each other in the front-rear direction. Member lower) is provided (see FIG. 8), and each of the tunnel side members 30 and 30 is joined and fixed to the flange portion 13f.

The lower surface of the tunnel portion 13 which is structured as described above, fibrous having heat resistance, and fuel tank 32 is supported via a planar sealing member 31.

  As shown in FIG. 4, the fuel tank 32 is formed with a wide portion 32a having a large width in the vehicle width direction at a front portion thereof, and an inclined portion having a narrow width toward the rear at the rear portion of the wide portion 32a. A narrow portion 32c having a narrow width in the vehicle width direction and a slim portion 32d having a smaller width in the vehicle width direction than the narrow portion 32c are formed via 32b.

In addition, an inclined portion 32e whose width in the vehicle width direction becomes narrower toward the front and a slim portion 32f extending forward by a predetermined amount are formed at the front portion of the wide portion 32a. The fuel tank 32, by thus configuring the shape of the vehicle width direction corresponding to the shape of the tunnel portion 13, while set as low as possible a tank full height, and configured to secure the tank capacity.

The fuel tank 32 has recesses 32g and 32h corresponding to the tunnel front member 24 and the tunnel intermediate member 26, respectively.
In order to detachably support the above-described fuel tank 32 on the lower surface of the tunnel portion 13 through the seal member 31 in consideration of maintainability, the lower tunnel member corresponds to the tunnel front member 24 and the tunnel intermediate member 26. 33 and 34 are provided.

  Each of these lower tunnel members 33 and 34 is formed in a substantially concave shape when viewed from the front, and as shown in FIG. 5, the fuel tank 32 is formed using the lower tunnel member 33 on the front side and mounting members 35 and 35 such as bolts and nuts. The wide portion 32a is supported by the tunnel portion 13, and as shown in FIG. 7, the narrow portion 32c of the fuel tank 32 is formed by using the lower tunnel member 34 on the rear side and mounting members 36, 36 such as bolts and nuts. It is supported by the tunnel part 13.

Here, the lower tunnel members 33 and 34 described above are members that connect the open end side of the tunnel portion 13 in the vehicle width direction via the elements 24 and 26, and a plurality of lower tunnel members spaced in the front-rear direction. The members 33 and 34 are configured to improve the support rigidity of the fuel tank 32.
4, that is, a tunnel portion 13 including a tunnel front member 24, a tunnel intermediate member 26, a tunnel rear member 28, and front and rear tunnel side members 29, 30, a seal member 31, and a fuel tank. 32 and the lower tunnel members 33 and 34 are integrally modularized to form a module M (see FIGS. 12 to 15).

The module M, the mounting position of the front and rear of the flat portion 14 of FIG. 3 alpha, removably attached to the beta. That is, FIG. 6, the floor tunnel 16 of the module M is flat portion 14 with a mounting member 37, 38 made of a bolt and nut long as shown in FIG. 8, the opening edge portion 20, the gas-tight manner to the floor tunnel 18 Mounted on.

In this case, as shown in FIG. 10, a seal member 39 is interposed between the lower surface of the floor panel 4 and each of the elements 16, 20, and 18 and the corresponding portion of the tunnel portion 13 to ensure sealing performance. It is configured accordingly.

Further, (see FIG. 4) majority portion 32U of the upper fuel tank 32 is located in the tunnel portion 13 (see FIG. 4) part of the lower 32L is positioned outside of the vehicle below the lower surface of the floor panel 4 It is arranged like this.
By the way, a front seat 40 for the front seat occupant X is provided above the cross member 21 (so-called No. 2.5 cross member) as shown in FIGS. A rear seat 41 for the rear seat occupant Y is provided above the (3 cross member). Each of these seats 40 and 41 is a separate seat provided with a seat cushion 42, a seat back 43, and a headrest 44, and the side of the inclined portion 16e and the slim portion 16f in the floor tunnel 16 is a leg space of the front seat occupant X. In addition, the side of the narrow portion 20c and the slim portion 20d at the opening edge 20 is set as a leg space of the rear seat occupant Y.

  In the figure, 45 is an engine, 46 is a front wheel, and 47 is a rear wheel. 2 is an exhaust pipe as an exhaust passage for exhausting the exhaust gas of the engine 45 to the rear of the vehicle. A pre-silencer 49 is provided in the middle of the exhaust pipe 48, and a main silencer 50 is provided at the rear end. Each is provided.

5 is a cross-sectional view taken along line AA in FIG. 1, FIG. 6 is a cross-sectional view taken along line BB in FIG. 1, FIG. 7 is a cross-sectional view taken along line CC in FIG. D-D sectional view taken along line of FIG. 9 is a E-E in sectional view taken along line of FIG. 1, a side sill 8 described above that is bonded to the right and left side ends of the floor panel 4, side sill and side sill inner 51 A reinforcement 52 and a side sill outer 53 are joined to each other, and a side sill closed section 54 extending in the vehicle front-rear direction is formed between the side sill inner 51 and the side sill outer 53.

A closed cross section 55 extending in the front-rear direction of the vehicle is formed between the floor panel 9 and the floor frame 9 joined to the lower surface of the floor panel 4.
Further, a rear floor frame 12 which is joined to the lower surface of the floor panel 4, closed cross section 56 extending in the longitudinal direction is formed between the floor panel 4.

Next, a method for assembling the lower body of the vehicle will be described.
FIG. 11 is a process diagram showing an assembling method. In the cross member assembling process U1 shown in FIG. 11, the tunnel portion 13 (see FIG. 4) and the flat portion 14 (see FIG. 3). 3, the respective cross members 15, 21, 17 are assembled to the flat portion 14 divided into a plurality of flat portions 14 in a state where the cross members 15, 21, 17 are not assembled.

  That is, as shown in FIGS. 12, 14, and 16, a cross member 15 (so-called No. 2 cross member) is set corresponding to the wide portion 16a of the floor tunnel 16, and the cross member 15 is set to the floor panel 4 and the floor. Join to the tunnel 16. Further, cross members 21 and 21 (so-called No. 2.5 cross members) are set corresponding to the narrow portions 20c of the opening edge portions 20, and the cross members 21 and 21 are joined to the floor panel 4. Further, a cross member 17 (so-called No. 3 cross member) is set corresponding to the floor tunnel 18, and the cross member 17 is joined to the floor panel 4 and the floor tunnel 18. In addition, the tunnel side members 22 and 23 on the floor side are joined to the floor panel 4 along the left and right sides of the opening edge 20.

  In particular, the cross members 15 and 17 described above extend in the vehicle width direction across the floor tunnels 16 and 18 and are assembled so as to overlap with the flat portion 14 and the tunnel portion 13 divided into a plurality of parts.

  Next, in the assembly step U2 shown in FIG. 11, the fuel tank 32 is assembled to the tunnel portion 13, and each element 13, 24, 26, 28, 29, 30, 31, 32, 33 is assembled as shown in FIGS. , 34, 35, and 36 are formed.

  Next, in the forming step U3 shown in FIG. 11, the module M in which the fuel tank 32 is pre-assembled only in the tunnel portion 13 is connected to the flat portion 14 as shown in FIGS. Form. In this case, as shown in FIG. 10, a seal member 39 is interposed between the lower surface of the floor panel 4 and each of the elements 16, 20, 18 and the facing portion of the module M, and shown in FIGS. 6 and 8. The module M is detachably attached to the attachment positions α and β in FIG. 3 using a pair of left and right attachment members 37 and 38.

Thus, when the module M is assembled | attached to the flat part 14, the tunnel T shown in FIG. 1, FIG. 2 is comprised. 2 , 57 is a dash cross member, 58 is an instrument panel, 59 is a rear cross member (so-called No. 4 cross member) extending in the vehicle width direction between the left and right rear side frames 11 and 11 on the lower surface of the rear floor 6. It is.

  In place of the bottom structure of the fuel tank 32 shown in FIG. 5 (or / and FIG. 7), as shown in FIG. 17, the recesses 60, 60 (however, the drawings) are formed in portions corresponding to the lower tunnel members 33, 34 of the fuel tank 32. (Only one recess is shown), and the front and rear recesses 60, 60 are supported by the lower tunnel members 33, 34, and the lower deck of the fuel tank 32 is substantially flush with the lowermost portions of the lower tunnel members 33, 34. It may be configured so that the tank capacity is secured and the tank rigidity is improved.

  Thus, the lower vehicle body structure of the vehicle of the above embodiment is provided with the tunnel T projecting upward toward the vehicle interior side at the center in the vehicle width direction of the floor panel 4 that forms the lower surface of the vehicle interior 2. A vehicle lower body structure in which a fuel tank 32 is disposed in a space inside a tunnel T under a floor panel 4, wherein the floor panel 4 is divided into a plurality of tunnel portions 13 and flat portions 14, and the fuel is formed. The tank 32 is configured to be modularized and supported only by the divided tunnel portion 13.

  According to this configuration, the floor panel 4 is formed by dividing it into a plurality of tunnel portions 13 and flat portions 14, so that the tunnel portion 13 and the flat portion 14 can be formed separately, and the lower surface of the passenger compartment 2 is formed. Even with such a relatively large and complex floor panel 4, the floor panel 4 can be established while ensuring the formability of the tunnel T.

  In addition, since the fuel tank 32 is modularized and supported only by the divided tunnel portion 13, it is possible to improve the assemblability of the fuel tank 32 and the floor panel 4.

  Further, the divided tunnel portion 13 is formed such that the shape in the vehicle width direction is narrower at the rear portion (see the narrow portion 13c) than the front portion (see the wide portion 13a), and the fuel tank 32 is Corresponding to the shape of the tunnel part 13, the shape in the vehicle width direction is formed so that the rear part (see the narrow part 32c) is narrower than the front part (see the wide part 32a).

  According to this configuration, even if the shape of the fuel tank 32 is somewhat complicated, the floor panel 4 is divided into a plurality of tunnel portions 13 and flat portions 14, so that these moldability is good, and the tunnel portion 13 In addition, the shape of the fuel tank 32, particularly the shape in the vehicle width direction, can ensure the tank capacity while reducing the vertical height of the fuel tank 32 as much as possible. It is possible to ensure the comfort of living.

Further, the floor panel 4 is provided with a cross member 15 that extends in the vehicle width direction across the floor tunnel 16 and overlaps with the flat part 14 and the tunnel part 13 that are divided into a plurality of parts.
According to this configuration, even if the cross member 15 is divided into the flat portion 14 and the tunnel portion 13, the above-described cross member 15 is superposed on both the portions 13 and 14, so that the vehicle body rigidity can be ensured.

  Further, in the method of assembling the lower vehicle body of the vehicle of the above embodiment, a tunnel T is provided at the center in the vehicle width direction of the floor panel 4 that forms the lower surface of the passenger compartment 2 so as to project upward toward the inner side of the passenger compartment 2. A method of assembling a lower vehicle body of a vehicle in which a fuel tank 32 is disposed in a space in a tunnel T below the floor panel 4, wherein the tunnel portion 13 of the floor panel 4 divided into a plurality of tunnel portions 13 and flat portions 14 is provided. And an assembly process U2 for sub-assembling the fuel tank 32, and a forming process U3 for connecting the tunnel portion 13 and the flat portion 14 to form the floor panel 4.

  According to this configuration, the fuel tank 32 is sub-assembled in the tunnel part 13 of the floor panel 4 divided into a plurality of the tunnel part 13 and the flat part 14 in the assembly process U2, and the fuel tank 32 is sub-assembled in the formation process U3. The assembled tunnel portion 13 is connected to the flat portion 14 to form the floor panel 4.

  As described above, since the tunnel part 13 and the flat part 14 are divided into a plurality of parts, the tunnel part 13 and the flat part 14 can be formed separately, and are relatively large and complicated to form the lower surface of the passenger compartment 2. Even with the floor panel 4, the floor panel 4 can be established while ensuring the formability of the tunnel T (see the tunnel portion 13).

  Further, the fuel tank 32 is assembled to the tunnel portion 13 in the assembly step U2, and the tunnel portion 13 (refer to the module M) in which the fuel tank 32 is sub-assembled is connected to the flat portion 14 in the next formation step U3. The assembling property between the floor 32 and the floor panel 4 can be improved.

In addition, prior to the assembly process U2, a cross member assembly process U1 for assembling the cross member 15 to the flat portion 14 is provided.
According to this configuration, by dividing the floor panel 4 into the tunnel portion 13 and the flat portion 14, the opening portion 19 is formed in the flat portion 14, and the rigidity of the flat portion 14 becomes weak. Since the flat part 14 is assembled, the rigidity of the flat part 14 can be ensured, and as a result, the assemblability can be further improved.

Further, the cross member 15 is assembled so as to overlap with the flat part 14 and the tunnel part 13 which are divided into a plurality of parts.
According to this configuration, even when the flat portion 14 and the tunnel portion 13 are divided, the above-described cross member 15 is assembled so as to overlap with both the portions 13 and 14, so that the vehicle body rigidity can be ensured. .

In the correspondence between the configuration of the present invention and the above-described embodiment,
The front portion of the tunnel portion of the present invention corresponds to the wide portion 13a of the embodiment,
Similarly,
The rear part of the tunnel part corresponds to the narrow part 13c,
The front part of the fuel tank corresponds to the wide part 32a of the fuel tank 32,
The rear part of the fuel tank corresponds to the narrow part 32c of the fuel tank 32,
The present invention is not limited to the configuration of the above-described embodiment.

  For example, the flat portion 14 shown in FIG. 3 may be formed integrally with the rear floor 6, or the rear floor 6 is formed separately from the flat portion 14, and the separately formed rear floor 6 is attached to the flat portion 14. You may comprise so that it may connect. In the above embodiment, the tunnel side members 22 and 23 are provided between the cross members 15 and 21 including the attachment positions α and β, 21 and 17, and between the members 24 and 26 on the tunnel portion 13 side, 26 and 28. Although the tunnel side members 29 and 30 are provided between them, a structure in which a bracket is provided only at a portion to which the attachment members 37 and 38 are attached may be employed instead of this structure.

The top view which shows the lower vehicle body structure of the vehicle of this invention. The side view which shows the lower vehicle body structure of a vehicle. The perspective view of a flat part. The disassembled perspective view of the module containing a tunnel part and a fuel tank. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1. CC cross-sectional view of FIG. The DD sectional view taken on the line of FIG. FIG. 2 is a cross-sectional view taken along line EE in FIG. 1. The elements on larger scale of FIG. Process drawing which shows the assembly method of the lower vehicle body of the vehicle of this invention. Sectional drawing which shows the state before the module and cross member assembly | attachment of FIG. Sectional drawing which shows the state before the module assembly | attachment of FIG. Sectional drawing which shows the state before the module and cross member assembly | attachment of FIG. Sectional drawing which shows the state before the module assembly | attachment of FIG. Sectional drawing which shows the state before the module assembly | attachment of FIG. Sectional drawing which shows the other Example of the support structure of a fuel tank.

T ... Tunnel M ... Module U1 ... Cross member assembly process U2 ... Assembly process U3 ... Formation process 2 ... Car compartment 4 ... Floor panel 13 ... Tunnel part 13a ... Wide part (front part)
13c: Narrow part (rear part)
14 ... Flat part 15 ... Cross member 16 ... Floor tunnel 32 ... Fuel tank (fuel tank)
32a ... Wide part (front part)
32c ... Narrow part (rear part)

Claims (6)

A tunnel portion projecting upward toward the vehicle interior side is provided at the center in the vehicle width direction of the floor panel forming the lower surface of the vehicle interior, and a fuel tank is disposed in the space in the tunnel below the floor panel. A lower body structure of a vehicle,
The floor panel is divided into a plurality of flat portions integrally forming the bottom surface of the passenger compartment and a tunnel portion attached to the flat portion from below ,
Install the fuel tank from below the divided tunnel part and support it as a module ,
A lower body structure of a vehicle in which a modularized tunnel portion and a fuel tank are attached to the flat portion from below . The divided tunnel part is formed with a narrower rear part compared to the front part in the vehicle width direction,
2. The lower body structure of a vehicle according to claim 1, wherein the fuel tank has a vehicle width direction shape narrower at a rear portion than at a front portion, corresponding to the shape of the tunnel portion. The lower body of a vehicle according to claim 1 or 2, wherein the floor panel is provided with a cross member extending in the vehicle width direction across the floor tunnel and overlapping with a plurality of divided flat portions and tunnel portions. Construction. Tunnel portion which projects upwardly toward the vehicle interior side in the vehicle width direction central portion of the floor panel to form a cabin bottom surface is provided, the fuel tank is disposed in the tunnel space under the floor panel A method for assembling the lower body of the vehicle,
An assembly step of sub-assembling the fuel tank from below into the tunnel portion of the floor panel divided into a tunnel portion and a flat portion;
A method for assembling a lower vehicle body of a vehicle, comprising: a flat portion integrally forming a bottom surface of a passenger compartment ; and a forming step of connecting the tunnel portion from below the flat portion to form a floor panel. 5. The method of assembling a lower body of a vehicle according to claim 4, further comprising a cross member assembling step for assembling the cross member to the flat portion prior to the assembling step. 6. The method of assembling a lower vehicle body of a vehicle according to claim 5, wherein the cross member is assembled so as to overlap the flat portion and the tunnel portion divided into a plurality of portions.

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