JP4529466B2 - Vehicle fuel tank support structure - Google Patents

Description

  The present invention relates to a fuel tank arrangement structure for a vehicle in which a fuel tank is arranged in a space in a tunnel portion extending in the front-rear direction of the vehicle.

Conventionally, as a fuel tank support structure for a vehicle in 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. As a countermeasure against this side collision, there is a problem in that the above-mentioned fuel tank is surrounded by a frame and protected to increase the weight.

On the other hand, another structure of a conventional fuel tank support structure for a vehicle includes 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 size of the part increases, it is difficult to walk through in the vehicle width direction, and is not particularly suitable for compact cars. In addition, there is no disclosure of the relevance to the body structure such as a cross member considering side collisions. The vehicle body rigidity against side collision and the protection performance of the fuel tank were insufficient.

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

  According to the present invention, a fuel tank is disposed in a space in a tunnel portion below a floor panel, and a cross member extending in the vehicle width direction perpendicular to the tunnel portion is provided on the floor panel, and the tunnel is provided at a position corresponding to the cross member. By providing a tunnel member that connects the open side of the section in the vehicle width direction and supporting the fuel tank with the tunnel member, the cross member improves the rigidity of the vehicle body, particularly in the part where the vehicle body rigidity against side collision is improved To provide a fuel tank support structure for a vehicle capable of supporting a fuel tank, ensuring the support rigidity of the fuel tank, being advantageous for side collision, and ensuring the protection performance of the fuel tank. To do.

In the fuel tank support structure for a 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 below the floor panel is provided. A fuel tank support structure for a vehicle in which a fuel tank is disposed in a space inside the section, wherein a cross member extending in the vehicle width direction perpendicular to the tunnel portion is spaced apart in the vehicle front-rear direction on the floor panel A plurality of tunnel members are provided to connect the open side of the tunnel portion in the vehicle width direction at positions corresponding to the plurality of cross members, respectively, and the tunnel members spaced apart from each other by a predetermined interval in the front-rear direction. and the fuel tank is supported, the tunnel portion includes a front width in the vehicle width direction is large, and a narrow width in the vehicle width direction as compared to said front rear, the fuel tank The vehicle is formed in a shape in the vehicle width direction corresponding to the tunnel portion, and a front seat and a rear seat disposed behind the front seat are provided in the vehicle interior, and the front seat is The tunnel portion is disposed above the front portion having a large width in the vehicle width direction and attached to the cross member, while the rear seat is further in the vehicle width direction than the rear portion having a narrow width in the vehicle width direction of the tunnel portion. A front portion having a large width in the vehicle width direction of the tunnel portion extends to a position overlapping with the front seat in a plan view vehicle width direction, and disposed above the slim portion having a small width, and the fuel in the tunnel portion Above the tank, there are provided a tunnel front member and a tunnel rear member that form a closed section with the tunnel portion and extend in the vehicle width direction. The tunnel member includes the tunnel front member and the tunnel rear member. And Nba and supports the fuel tank are connected by the lower of the fuel tank.

The cross member described above may be orthogonal to the tunnel portion and extend in the vehicle width direction across the tunnel portion.
According to the above configuration, the fuel tank is supported by the tunnel member at a position corresponding to the portion where the cross member has improved the vehicle body rigidity, in particular, the vehicle body rigidity against the side collision, so the support rigidity of the fuel tank is ensured. In addition, it is advantageous against side collision, and the protection performance of the fuel tank can be ensured.

Further, since the fuel tank is supported by a plurality of tunnel members that are provided at predetermined intervals in the front-rear direction and that connect the tunnel opening side in the vehicle width direction, it is possible to improve the support rigidity of the fuel tank. .

Furthermore, the shape of the tunnel part and the fuel tank can ensure the tank capacity while reducing the vertical height of the fuel tank as much as possible,
In addition, it is possible to ensure comfort in the vertical direction in the passenger compartment.

  In short, the support rigidity of the fuel tank, the tank capacity of the fuel tank, and the comfort in the vertical direction can be achieved.

Furthermore, it is possible to achieve both the support rigidity of the fuel tank by the tunnel member provided corresponding to the cross member and the support rigidity of the front seat attached to the cross member.

In one embodiment of the present invention, the cross member is disposed corresponding to at least a front portion having a large width in the vehicle width direction of the tunnel portion.
According to the above configuration, when the width of the tunnel portion in the vehicle width direction is large, there is a general tendency that it is disadvantageous against a side collision, but since a cross member is provided corresponding to this part, the vehicle body rigidity against the side collision It is possible to improve safety, and it is advantageous to a side collision and can improve safety.

In one embodiment of the present invention, the cross member is disposed corresponding to the rear portion of the tunnel portion having a narrow width in the vehicle width direction.
According to the above configuration, it is possible to improve the rigidity of the vehicle body against the side collision and the support rigidity of the fuel tank .

  According to the present invention, the fuel tank is disposed in the space in the tunnel portion under the floor panel, while the floor panel is provided with the cross member extending in the vehicle width direction perpendicular to the tunnel portion, and the position corresponding to the cross member. A tunnel member that connects the open side of the tunnel portion in the vehicle width direction is provided, and the fuel tank is supported by the tunnel member, so the cross member improves the vehicle body rigidity, particularly the vehicle body rigidity against side collisions It is possible to support the fuel tank, and to secure the supporting rigidity of the fuel tank, which is advantageous with respect to a side collision, and has an effect of ensuring the protection performance of the fuel tank.

The fuel tank is supported by the cross member so as to improve the rigidity of the vehicle body, particularly the vehicle body rigidity against the side collision, to secure the supporting rigidity of the fuel tank and to be advantageous for the side collision, and to protect the fuel tank. In order to ensure performance, a fuel tank is installed in the space inside the tunnel under the floor panel, and a cross member extending in the vehicle width direction perpendicular to the tunnel is separated from the floor panel in the longitudinal direction of the vehicle. a plurality and the tunnel member for connecting the tunnel portion open side in the vehicle width direction at positions corresponding respectively to the plurality of cross members provided for supporting the fuel tank by a plurality of said tunnel member separating a predetermined interval in the longitudinal direction The tunnel portion includes a front portion having a large width in the vehicle width direction and a rear portion having a narrow width in the vehicle width direction as compared with the front portion. The front seat and a rear seat disposed behind the front seat are provided in the vehicle interior, and the front seat is connected to the tunnel. The rear seat is disposed above the front portion having a large width in the vehicle width direction and is attached to the cross member, while the rear seat is wider in the vehicle width direction than the rear portion in which the width in the vehicle width direction of the tunnel portion is narrow. The front portion of the tunnel portion having a large width in the vehicle width direction extends to a position overlapping the front seat in the vehicle width direction in plan view, and the fuel tank in the tunnel portion A tunnel front member and a tunnel rear member that extend in the vehicle width direction by forming a closed cross section with the tunnel portion are provided above, and the tunnel member connects the tunnel front member and the tunnel rear member. It was achieved by a configuration that supports the fuel tank are connected below the serial fuel tank.

An embodiment of the present invention will be described in detail with reference to the drawings.
The drawings show a fuel tank support structure of a vehicle. In FIGS. 1, 2 and 3, a dash lower panel (dash panel) 3 for partitioning the engine room 1 and the vehicle compartment 2 in the front-rear direction is provided, and the lower end of the dash lower panel 3 is provided. The floor panel 4 which forms the lower surface of the compartment 2 is connected to the part.

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

  A tunnel portion 8 that protrudes upward toward the inside of the passenger compartment 2 is provided at the center in the vehicle width direction of the floor panel 4 described above.

  As shown in FIGS. 3 and 4, the tunnel portion 8 extends in the vehicle front-rear direction from the dash lower panel 3 toward the kick-up portion 5, and has a wide portion 8a having a large width in the vehicle width direction at the front portion. A narrow portion 8c having a narrow width in the vehicle width direction is provided at the rear portion of the wide portion 8a via an inclined portion 8b that is narrow toward the rear, and the vehicle width is further wider than the narrow portion 8c. A slim portion 8d having a small width in the direction is formed.

Further, an inclined portion 8e whose width in the vehicle width direction becomes narrower toward the front and a slim portion 8f extending forward toward the dash lower panel 3 are formed at the front portion of the wide portion 8a.
And the front seats 9, 9 as the front seats are disposed above the wide portion 8a having a large width in the vehicle width direction of the tunnel portion 8 described above, while the slim portion having a narrow width in the vehicle width direction of the tunnel portion 8 is provided. Rear seats 10 and 10 as rear seats are disposed above the rear portion of 8d, and a plurality of rows of seats 9 and 10 are disposed in the front and rear of the passenger compartment 2.

  Here, as shown in FIGS. 1, 2, and 4, the above-described front seat 9 includes a seat cushion 11, a seat back 12, and a headrest 13, and the rear seat 10 similarly has a seat cushion 14, a seat, and the like. It has a back 15 and a headrest 16.

  Sides of the narrow portion 8c and the slim portion 8d of the tunnel portion 8 described above are set as leg space of the rear seat occupant Y (see FIG. 2) seated on the rear seat 10. In particular, in this embodiment, as shown in FIG. 2, the rear seat occupant Y (see FIG. 2) is located between the side of the narrow portion 8c of the tunnel portion 8, the upper surface of the floor panel 4, and the lower portion of the seat cushion of the front seat 9. ) Footrest space (the position of the foot of the rear seat occupant Y in FIG. 5 is indicated by a virtual line α).

Further, the side portions of the inclined portion 8e and the slim portion 8f are formed in the leg space of the front seat occupant X (see FIG. 2).
As shown in FIGS. 1 and 2, a pair of left and right front side frames 17, 17 as vehicle body rigid members extending forward from the dash lower panel 3 are provided on both sides in the engine room 1. , 17 are provided along the lower surface of the dash lower panel 3 along the lower portion of the floor panel 4, and a floor frame 18 is integrally or integrally attached to a side end of the front side frame 17.

  The above-described floor frame 18 is a vehicle body rigid member that extends in a straight line in the front-rear direction of the vehicle along the lower surface of the floor panel 4 as shown in FIGS. 1 and 3, and between the floor frame 18 and the floor panel 4. Is formed with a closed section 19 extending in the same direction.

  Further, side sills 20 extending in the front-rear direction of the vehicle are provided at both left and right ends of the floor panel 4. The side sill 20 is a vehicle body rigid member formed by joining a side sill inner 21, a side sill reinforcement 22, and a side sill outer 23 as shown in FIGS. 6, 7, and 8, and the side sill inner 21 and the side sill outer 23 are joined together. A side sill closed section 24 extending in the front-rear direction of the vehicle is formed between the front and rear sides 23.

  Here, as shown in FIG. 1, the floor frame 18 is provided between the side sill 20 and the tunnel portion 8 so as to extend in the front-rear direction of the vehicle along the lower surface of the floor panel 4. An exhaust pipe 26 serving as an exhaust passage for exhausting exhaust gas from the engine 25 to the rear of the vehicle is disposed between the tunnel 18 and the tunnel portion 8.

As shown in FIGS. 1 and 2, a pre-silencer 27 is interposed in the middle of the exhaust pipe 26 described above, and a main silencer 28 is attached to the rear end of the exhaust pipe 26.
As shown in FIGS. 1 and 3, the floor panel 4 corresponding to the wide portion 8 a of the tunnel portion 8 spans the tunnel portion 8 and extends to the side sill inners 21, 21 in the left and right side sills 20, 20. A cross member 30 (so-called No. 2 cross member) is provided as a vehicle body rigid member that extends to the vehicle. The cross member 30 has a hat shape in cross section, and extends in the vehicle width direction perpendicular to the tunnel portion 8 extending in the front-rear direction of the vehicle. When the cross member 30 described above is orthogonal across the tunnel portion 8, the rigidity of the wide portion 8a can be improved.

  At a position separated from the cross member 30 in the front-rear direction of the vehicle, more specifically at a position corresponding to the narrow portion 8c of the tunnel portion 8, the floor panel 4 includes side sill inners 21, 21 on the left and right side sills 20, 20. Cross member 31, 31 as a vehicle body rigid member connecting between the narrow portions 8c, 8c, so-called No. 2.5 cross members) are provided. The cross member 31 also has a hat shape in cross section, and extends in the vehicle width direction orthogonal to the tunnel portion 8 extending in the front-rear direction of the vehicle.

  As shown in FIGS. 1 and 2, a cross member 32 (so-called No. 3 cross member) extending in the vehicle width direction is attached to the rear surface of the kick-up portion 5 on the rear end side of the side sill 20, and the kick-up portion 5 The rear side frames 33 and 33 are attached to both sides of the rear floor panel 6 from both sides, and a cross member (so-called No. 4 cross) is connected to the front lower surface of the rear floor panel 6 between the left and right rear side frames 33 and 33 in the vehicle width direction. Member) 34 is attached. The cross members 32 and 34 and the rear side frame 33 described above are all vehicle body rigid members.

  Further, as shown in FIG. 1, a pair of left and right rear floor frames 35, 35 are attached to the lower surface of the floor panel 4. The rear floor frame 35 is a vehicle body rigid member that extends in the front-rear direction of the vehicle in the front-rear direction so as to correspond to the cross members 31, 32 and is positioned between the side sill 20 and the floor frame 18 in the vehicle width direction.

In the figure, 36 is a front wheel, 37 is a rear wheel, 38 is an instrument panel, 39 is a seat slide rail, and the front seat 9 is attached to the cross members 30 and 31.
FIG. 5 shows a fuel tank 40 disposed in the space in the tunnel portion 8 below the floor panel 4, and the fuel tank 40 is formed in a shape in the vehicle width direction corresponding to the tunnel portion 8.

  That is, as shown in FIG. 5, the fuel tank 40 has a wide portion 40a having a large width in the vehicle width direction at the front portion thereof, and an inclined portion that becomes narrow toward the rear at the rear portion of the wide portion 40a. A narrow portion 40c having a narrow width in the vehicle width direction and a slim portion 40d having a smaller width in the vehicle width direction than the narrow portion 40c are formed via 40b.

  Further, an inclined portion 40e whose width in the vehicle width direction becomes narrower toward the front and a slim portion 40f extending forward by a predetermined amount are formed at the front portion of the wide portion 40a. By configuring the fuel tank 40 in such a shape, it is configured to ensure the tank capacity while setting the overall height of the tank as low as possible.

  And the fuel tank 40 of such a shape is arrange | positioned in the space in the tunnel part 8 of the floor panel 4 lower part as shown in FIGS. 1-4, FIG. In this case, the majority portion 40U (see FIG. 5) is located in the tunnel portion 8 on the upper side of the fuel tank 40, and the lower portion 40L (see FIG. 5) is from the lower surface of the floor panel 4 as shown in FIG. It arrange | positions so that it may be located in the downward vehicle outer side.

  As shown in FIGS. 1 and 2, a filler pipe 41 as a fuel supply pipe is connected to the rear end of the fuel tank 40, and the filler pipe 41 is led to a filler box 42 on the rear fender panel side. By connecting the filler panel 41 to the rear end of the fuel tank 40, the length of the filler pipe 41 can be shortened, and the improvement of safety can be ensured.

  Further, as shown in FIG. 1, a breather pipe 43 for allowing air in the fuel tank 40 to escape during refueling is attached to the upper center of the fuel tank 40, and the breather pipe 43 is led to a filler box 42 on the rear fender panel side.

  Further, as shown in FIGS. 1 and 2, a canister 44 is disposed along the inclined portion 40e below the inclined portion 40e as the front end portion of the fuel tank 40. The canister 44 is arranged close to the engine 25 as much as possible, and the space is effectively used. The above-mentioned canister 44 temporarily stores the evaporated gas from the fuel tank 40 and sucks the evaporated gas together with outside air into the intake system of the engine 25 when the engine 25 is started.

Next, the support structure for the fuel tank 40 will be described with reference to FIGS.
7 is a cross-sectional view taken along line AA in FIG. 1, FIG. 8 is a partially enlarged view of FIG. 7, FIG. 9 is a cross-sectional view taken along line BB in FIG. An arrow sectional view and FIG. 11 are the principal part enlarged views of FIG.
The fuel tank 40 is formed with recesses 40g and 40h (see FIG. 5) corresponding to the wide portion 40a and the narrow portion 40c. As shown in FIGS. 7 and 11, the wide portion of the tunnel portion 8 is formed. A tunnel front member 50 (so-called tunnel member inner) having a hat-shaped cross section is joined to the lower surface of the portion 8a so as to correspond to the recess 40g. The tunnel front member 50 is a reinforcing member that connects the outer side of the tunnel portion 8 in the vehicle width direction at a position corresponding to the cross member 30 in the upper portion of the fuel tank 40, and is formed between the tunnel portion 8 and the tunnel front member 50. A closed section 51 extending in the vehicle width direction is formed therebetween.

  Further, a lower tunnel member 52 is provided at the position corresponding to the above-mentioned cross member 30 and tunnel front member 50 in the vertical direction at the lower part of the fuel tank 40 to connect the open side of the tunnel portion 8 in the vehicle width direction. The fuel tank 40 is supported by the lower tunnel member 52 by fixing the left and right ends of the member 52 to the left and right ends of the tunnel front member 50 using mounting members 53 such as bolts and nuts.

  In this embodiment, as shown in an enlarged view in FIG. 8, the lower tunnel member 52 described above is formed by processing both ends of the pipe member to be flat, and against a nut 53 </ b> N previously welded and fixed to the upper surface of the tunnel front member 50. The lower tunnel member 52 is detachably attached to the tunnel front member 50 by tightening the bolts 53B from below.

  Further, as shown in FIGS. 9 and 11, a tunnel rear member 54 (so-called tunnel member inner) having a hat-shaped cross section is joined to the lower surface of the narrow portion 8c of the tunnel portion 8 so as to correspond to the concave portion 40h of the fuel tank 40. Has been. The tunnel rear member 54 is a reinforcing member that connects the outer side of the tunnel portion 8 in the vehicle width direction at a position corresponding to the cross member 31 in the upper portion of the fuel tank 40, and is formed between the tunnel portion 8 and the tunnel rear member 54. A closed section 55 extending in the vehicle width direction is formed therebetween.

  Further, at a position corresponding to the above-described cross member 31 and tunnel rear member 54, a lower tunnel member 56 is provided at the lower portion of the fuel tank 40 to connect the open side of the tunnel portion 8 in the vehicle width direction. The fuel tank 40 is supported by the lower tunnel member 56 by fixing the left and right ends to the left and right ends of the tunnel rear member 54 using mounting members 57 such as bolts and nuts.

  In this embodiment, the above-described lower tunnel member 56 is formed by processing both ends of a pipe member flat, and a bolt is tightened from below to a nut that is welded and fixed to the upper surface of the tunnel rear member 54 from the lower tunnel member. 56 is detachably attached to the tunnel rear member 54.

  In short, the lower tunnel members 52 and 56 (see FIGS. 7 and 9) correspond to the cross member 30 (see FIG. 7) and the cross member 31 (see FIG. 9) provided apart from each other in the longitudinal direction of the vehicle. ), And the lower tunnel members 52 and 56 connecting the open side of the tunnel portion 8 are configured to support the fuel tank 40 with a predetermined interval in the front-rear direction of the vehicle. It is configured to ensure support rigidity.

Further, as shown in FIGS. 7 to 11, a heat-resistant fibrous sheet-like seal is provided between the upper surface portion of the fuel tank 40 and the lower surface of the tunnel portion 8, the lower surface of the tunnel front member 50, and the lower surface of the tunnel rear member 54. A member 58 is interposed.
Further, as shown in FIGS. 7, 9, and 11, an exhaust pipe 26 extending in the front-rear direction of the vehicle is disposed between the floor frame 18 and the tunnel portion 8. ), The exhaust pipe 26 is arranged as straight as possible, the exhaust pipe 26 is arranged so as not to interfere with the floor frame 18, the floor surface is set low, and the fuel tank 40 Is positioned in the tunnel portion 8 so that the fuel tank 40 is less likely to receive heat from the exhaust pipe 26 and is designed to prevent thermal damage.

  In place of the bottom structure of the fuel tank 40 shown in FIG. 11, as shown in FIG. 12, recesses 40m and 40n are formed in portions corresponding to the lower tunnel members 52 and 56 of the fuel tank 40, and the front and rear recesses 40m, 40n is supported by the lower tunnel members 52 and 56, and the lower deck of the fuel tank 40 is set to be substantially flush with the lowermost portions of the lower tunnel members 52 and 56 to further improve the tank capacity and the tank rigidity. You may comprise so that.

  In the figure, 59 is a dash cross member, arrow F indicates the front of the vehicle, and arrow R indicates the rear of the vehicle. Further, FIG. 4 shows a seat arrangement state in which the front seat 9 on the passenger seat side is slid rearward after the seat cushion 14 of the rear seat 10 is folded upright on the seat back 15 side.

  As described above, the fuel tank support structure for a vehicle according to the above-described embodiment is provided with the tunnel portion 8 projecting upward toward the inside of the passenger compartment 2 at the center in the vehicle width direction of the floor panel 4 that forms the lower surface of the passenger compartment 2. A fuel tank support structure for a vehicle in which a fuel tank 40 is disposed in a space inside the tunnel portion 8 below the floor panel 4, and the floor panel 4 is orthogonal to the tunnel portion 8 (however, substantially orthogonal And a lower tunnel member 52 (see FIG. 7) for connecting the open side of the tunnel portion 8 in the vehicle width direction at a position corresponding to the cross member 30. The fuel tank 40 is supported by the lower tunnel member 52.

  According to this configuration, the fuel tank 40 is supported by the lower tunnel member 52 at a position corresponding to the portion of the cross member 30 that has improved the vehicle body rigidity, particularly the vehicle body rigidity against a side collision. The support rigidity is ensured, and it is advantageous for side collision, and the protection performance of the fuel tank 40 can be ensured.

  A plurality of the cross members are provided apart from each other in the front-rear direction of the vehicle, and lower tunnel members 52, 56 (see FIGS. 7 and 9) are provided corresponding to the plurality of cross members 30, 31, respectively. The fuel tank 40 is supported by a plurality of lower tunnel members 52, 56 spaced apart from each other by a predetermined distance.

  According to this configuration, the fuel tank 40 is supported by the plurality of lower tunnel members 52 and 56 that are provided at a predetermined interval in the front-rear direction and connect the open side of the tunnel portion 8 in the vehicle width direction. The support rigidity of the tank 40 can be improved.

  Moreover, the tunnel portion 8 includes a front portion having a large width in the vehicle width direction (see the wide portion 8a) and a rear portion having a narrow width in the vehicle width direction as compared to the front portion (see the narrow portion 8c). As shown in FIG. 5, the fuel tank 40 is formed in a shape in the vehicle width direction corresponding to the tunnel portion 8.

  According to this configuration, the shape of the tunnel portion 8 and the fuel tank 40 can ensure the tank capacity while minimizing the vertical height of the fuel tank 40 as much as possible. Ensuring comfort in the vertical direction can be achieved.

In short, it is possible to achieve the support rigidity of the fuel tank 40, the tank capacity of the fuel tank 40, and the comfort in the vertical direction.
Further, the cross member 30 is disposed corresponding to at least a front portion (see the wide portion 8a) having a large width in the vehicle width direction of the tunnel portion 8.
According to this configuration, when the width of the tunnel portion 8 in the vehicle width direction is large, there is a general tendency that it is disadvantageous against a side collision. However, since the cross member 30 is provided corresponding to this portion, The rigidity of the vehicle body is improved, which is advantageous against a side collision, and the safety can be improved.

  As shown in this embodiment, when the cross member 30 described above extends in the vehicle width direction across the wide portion 8a of the tunnel portion 8, the rigidity of the wide portion 8a can be improved.

In addition, the cross member 31 is disposed corresponding to the rear portion (see the narrow portion 8c) of the tunnel portion 8 having a narrow width in the vehicle width direction.
According to this configuration, it is possible to improve the rigidity of the vehicle body against the side collision and the support rigidity of the fuel tank 40. In particular, when the plurality of cross members 30 and 31 that are separated in the front-rear direction of the vehicle are disposed corresponding to both the front portion and the rear portion of the tunnel portion 8, the vehicle body rigidity is further improved.

A passenger seat (refer to the front seat 9) is provided in the passenger compartment 2, and the seat (refer to the front seat 9) is attached to the cross members 30 and 31.
According to the above configuration, the support rigidity of the fuel tank 40 by the lower tunnel members 52 and 56 provided corresponding to the cross members 30 and 31, and the support rigidity member of the front seat 9 attached to the cross members 30 and 31 Can be achieved.

  Further, as shown in the above embodiment, the tunnel front member 50 (FIG. 7) is formed on the vehicle outer side of the wide portion 8a (front portion) and the narrow portion 8c (rear portion) of the tunnel portion 8 along the shape of the tunnel portion 8. If the tunnel rear member 54 (see FIG. 9) is provided, the strength of both the front and rear portions of the tunnel portion 8 can be increased without obstructing the vertical living space of the passenger compartment 2.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The cross member of the present invention corresponds to the cross member 30 or / and the cross member 31 of the embodiment,
Similarly,
The tunnel member corresponds to the lower tunnel member 52 or / and the lower tunnel member 56,
The fuel tank corresponds to the fuel tank 40,
The front part with a large width in the vehicle width direction of the tunnel part corresponds to the wide part 8a,
The rear part with a narrow width in the vehicle width direction corresponds to the narrow part 8c,
The passenger seat corresponds to the front seat 9,
The present invention is not limited to the configuration of the above-described embodiment.

The top view which shows the fuel tank support structure of the vehicle of this invention. The side view which shows the fuel tank support structure of a vehicle. The perspective view of the principal part of FIG. The top view shown in the state which made the passenger seat a seat arrangement. The perspective view of a fuel tank. The DD sectional view taken on the line of FIG. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. The elements on larger scale of FIG. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1. The CC sectional view taken on the line of FIG. The principal part enlarged side view of FIG. The side view which shows the other Example of the bottom part structure of a fuel tank.

2 ... Vehicle compartment 4 ... Floor panel 8 ... Tunnel part 8a ... Wide part (front)
8c: Narrow part (rear part)
9 ... Front seat (seat)
30, 31 ... Cross member 40 ... Fuel tank (fuel tank)
52, 56 ... Lower tunnel member (tunnel member)

Claims (3)

A tunnel portion projecting upward toward the vehicle interior side is provided in the vehicle width direction center portion of the floor panel forming the vehicle interior lower surface,
A fuel tank support structure for a vehicle in which a fuel tank is disposed in a space in a tunnel portion below the floor panel,
The floor panel is provided with a plurality of cross members extending in the vehicle width direction perpendicular to the tunnel portion and spaced apart in the vehicle front-rear direction .
Tunnel member connecting the open side of the tunnel portion in the vehicle width direction is provided at a position corresponding to the plurality of cross members,
The fuel tank is supported by a plurality of the tunnel members spaced at a predetermined interval in the front-rear direction ,
The tunnel portion includes a front portion having a large width in the vehicle width direction, and a rear portion having a narrow width in the vehicle width direction as compared with the front portion.
The fuel tank is formed in a shape in the vehicle width direction corresponding to the tunnel portion,
A front seat and a rear seat disposed behind the front seat are provided in the vehicle interior,
The front seat is disposed above the front portion having a large width in the vehicle width direction of the tunnel portion and is attached to the cross member, while the rear seat is smaller than the rear portion having a narrow width in the vehicle width direction of the tunnel portion. Is further disposed above the slim part having a smaller width in the vehicle width direction,
The front portion having a large width in the vehicle width direction of the tunnel portion extends to a position overlapping the front seat in the vehicle width direction in plan view.
Above the fuel tank in the tunnel portion, a tunnel front member and a tunnel rear member extending in the vehicle width direction by forming a closed cross section with the tunnel portion are provided,
The fuel tank support structure for a vehicle, wherein the tunnel member supports the fuel tank by connecting the tunnel front member and the tunnel rear member below the fuel tank. The vehicle fuel tank support structure according to claim 1, wherein the cross member is disposed corresponding to at least a front portion of the tunnel portion having a large width in the vehicle width direction . The fuel tank support structure for a vehicle according to claim 1 or 2, wherein the cross member is disposed corresponding to a rear portion having a narrow width in the vehicle width direction of the tunnel portion .

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