JP2005247178A - Vehicular fuel tank disposition structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular fuel tank supporting structure capable of compatibly ensuring the rigidity of a tunnel part, and ensuring the supporting rigidity of a fuel tank by providing a floor frame extending in the longitudinal direction of a vehicle on a floor panel while the fuel tank is disposed in a space of the tunnel part, connecting the floor frame to the tunnel part, and mounting a fuel tank supporting part to a connection part. <P>SOLUTION: In the vehicular fuel tank supporting structure in which a tunnel part 8 is protruded upwardly toward the inside of a cabin from a center part in the vehicle width direction of a floor panel 4 to form a lower side of the cabin, and a fuel tank 40 is disposed in a space in the tunnel part 8 below the floor panel 4, a floor frame 18 extending in the longitudinal direction of the vehicle is provided on the floor panel 4, the floor frame 18 is connected to the tunnel part 8, and a supporting part of the fuel tank 40 is mounted on a connection part 18a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel tank support structure for a vehicle in which a fuel tank is disposed in a vehicle outer space portion of 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 against side collisions, and it is possible to achieve both the rigidity of the tunnel and the tank support rigidity with a simple structure. There was a problem that could not be done.

On the other hand, another structure of the 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. 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 becomes difficult to walk through in the vehicle width direction, making it particularly unsuitable for compact cars, and ensuring the rigidity of the tunnel and the tank support rigidity with a simple structure. There was a problem that could not be.
JP 2000-85382 A Japanese Utility Model Publication No.59-78131

  Therefore, in the present invention, in the case where the fuel tank is arranged in the space inside the tunnel portion, the floor panel is provided with a floor frame extending in the front-rear direction of the vehicle, the floor frame is connected to the tunnel portion, and the connection portion is An object of the present invention is to provide a fuel tank support structure for a vehicle that can achieve both the rigidity of the tunnel portion and the support rigidity of the fuel tank by attaching the support portion of the fuel tank.

The fuel tank arrangement structure for a vehicle according to the present invention is provided with a tunnel portion projecting upward toward the vehicle interior side at the vehicle width direction central portion of the floor panel forming the vehicle compartment lower surface,
A fuel tank support structure for a vehicle in which a fuel tank is disposed in an inner space of the tunnel portion below the floor panel, wherein the floor panel is provided with a floor frame extending in the front-rear direction of the vehicle, and the floor frame is connected to the tunnel And a support portion for the fuel tank is attached to the connecting portion.

  According to the above configuration, since the floor frame as the vehicle body rigid member extending in the front-rear direction of the vehicle is connected to the tunnel portion, the rigidity of the tunnel portion can be secured, and the connection portion (the tunnel portion of the floor frame and Since the fuel tank support portion is attached to the connecting portion of the fuel tank, the support rigidity of the fuel tank can be ensured. In short, it is possible to achieve both of ensuring the rigidity of the tunnel portion and ensuring the support rigidity of the fuel tank.

  In one embodiment of the present invention, the floor frame extends in the front-rear direction of the vehicle for a predetermined length along the side portion of the tunnel portion, and the support portion of the fuel tank is separated by a predetermined interval in the front-rear direction of the vehicle. And a plurality of support portions are attached to the extended portion of the floor frame.

  According to the above configuration, the plurality of fuel tank support portions provided at predetermined intervals in the front-rear direction are attached to the extending portion of the floor frame as the vehicle body rigid member, so that the fuel tank is supported at a plurality of front and rear locations. Thereby, the tank support rigidity can be improved.

  In one embodiment of the present invention, 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 compared to the front portion, and the fuel tank is provided in the tunnel portion. It is formed in a shape corresponding to the vehicle width direction, and the floor frame is connected over both the front portion and the rear portion of the tunnel portion.

  According to the above configuration, the shape of the tunnel portion and the fuel tank can ensure the tank capacity while minimizing the height of the fuel tank in the vertical direction, and can also ensure the vertical comfort in the vehicle interior. The rigidity of the tunnel portion can be ensured by the structure of the floor frame.

In one embodiment of the present invention, the support portion of the fuel tank is attached to the vehicle body via a tunnel member that connects the lower open side of the tunnel portion in the vehicle width direction.
According to the above configuration, since the support portion of the fuel tank is attached to the vehicle body via the above-described tunnel member, both improvement in the rigidity of the tunnel portion and improvement in the tank support rigidity can be achieved.

In one embodiment of the present invention, a cross member extending in the vehicle width direction perpendicular to the tunnel portion is provided at an upper portion of the floor panel, and a fuel tank support portion is connected to the cross member. It is a thing.
According to the above configuration, since the support portion of the fuel tank is connected to the cross member as the vehicle body rigidity member, the side collision rigidity, the vehicle body rigidity, and the tank support rigidity can be improved.

In one embodiment of the present invention, a plurality of the cross members are provided apart from each other in the front-rear direction of the vehicle, and a plurality of support portions of the fuel tank are connected to the plurality of cross members.
According to the above configuration, even if the fuel tank is formed long in the front-rear direction of the vehicle corresponding to the space in the tunnel portion below the floor panel, the fuel tank is supported at a plurality of front and rear positions corresponding to the plurality of cross members. The fuel tank can be stably supported.

  In one embodiment of the present invention, a seat for an occupant is provided above the floor panel, and the seat is attached to a position corresponding to the extension portion of the floor frame.

The above-mentioned passenger seat may be set as a rear seat.
According to the above configuration, since the above-described seat is attached to the position corresponding to the extension portion of the floor frame, it is possible to secure the seat support rigidity together with the tank support rigidity.

  In one embodiment of the present invention, the front end of the floor frame is connected to the rear end of the front frame, and the branch portion branched from the connection portion is connected to the side sill.

  According to the above configuration, since the branch point of the floor frame is connected to the side sill, it is possible to improve the floor rigidity and the torsional rigidity of the vehicle body, and the impact at the time of frontal collision of the vehicle and offset collision from the frontal direction. Since the load is transmitted to the side sill via the front frame and the branch portion, it is advantageous also for a normal collision.

  According to the present invention, in the case where the fuel tank is arranged in the space inside the tunnel portion, the floor panel is provided with the floor frame extending in the front-rear direction of the vehicle, the floor frame is connected to the tunnel portion, and the connection portion is Since the support portion of the fuel tank is attached, there is an effect that both the rigidity of the tunnel portion and the support rigidity of the fuel tank can be ensured.

  For the purpose of ensuring both the rigidity of the tunnel part and the support rigidity of the fuel tank, the floor panel is provided with a floor frame extending in the front-rear direction of the vehicle, the floor frame is connected to the tunnel part, and the connection part is This was achieved by installing a fuel tank support.

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 part.

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 5, the tunnel portion 8 extends in the front-rear direction of the vehicle 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 5, 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 space 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 11 in the front seat 9 is the rear seat occupant Y. (See FIG. 2).

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).
By the way, as shown in FIGS. 1 and 2, a pair of left and right front side frames 17 and 17 (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 17 and 17 are provided along the lower surface of the dash lower panel 3 along the lower part of the floor panel 4, and the front ends of the pair of left and right floor frames 18 and 18 are integrated with the rear end of the front side frame 17. Connected to.

The pair of left and right floor frames 18, 18 are formed in a substantially bilaterally symmetric structure. That is, the floor frame 18 is formed so as to have a connecting portion 18a connected to the lower surface open side of the tunnel portion 8 as shown in FIGS.
More specifically, the above-described floor frame 18 has an offset portion 18b that is offset inward in the vehicle width direction from the rear end portion of the front side frame 17, and the wide portion 8a of the tunnel portion 8 from the rear end of the offset portion 18b. An extension part 18c (this extension part 18c substantially corresponds to the connection part 18a) extending in the longitudinal direction of the vehicle for a predetermined length along the side part of the part 8b, the narrow part 8c, and the slim part 8d; An extending portion 18d that extends from the rear end of the extending portion 18c upward and to the rear side frame 19 while being curved outward in the vehicle width direction is provided.

The floor frame 18 extends in the vehicle front-rear direction along the side of the tunnel portion 8 on the lower surface of the floor panel 4, and the above-described extension portion 18 d is joined and fixed to the rear side frame 19.
Further, a branch frame 20 is provided as a branch portion branched from a connection portion α between the rear end of the front side frame 17 and the front end of the floor frame 18, and the branch frame 20 is aligned with the front side frame 17 as shown in FIG. Are extended in the vehicle front-rear direction, and the extended rear portion is curved outward in the vehicle width direction so that the side sill 21 (specifically, the side sill shown in FIGS. Connected to the inner 22).

  The side sill 21 described above is a vehicle body rigid member that is joined to the left and right ends of the floor panel 4 and extends in the front-rear direction of the vehicle. The side sill 21 includes a side sill inner 22 and a side sill rain as shown in FIGS. A side sill closed section 25 is formed between the side sill inner 22 and the side sill outer 24 and extends in the front-rear direction of the vehicle.

  By the way, as shown in FIG. 2, an exhaust pipe 27 is disposed below the floor panel 4 as an exhaust passage for exhausting exhaust gas from the engine 26 (see FIG. 1) to the rear of the vehicle.

As shown in FIG. 2, a pre-silencer 28 is interposed in the middle of the exhaust pipe 27 described above, and a main silencer 29 is attached to the rear end of the exhaust pipe 27.
On the other hand, as shown in FIGS. 1 and 3, the floor panel 4 corresponding to the wide portion 8 a of the tunnel portion 8 extends to the side sill inners 22 and 22 in the left and right side sills 21 and 21 across the tunnel portion 8. A cross member 30 (so-called No. 2 cross member) is provided as a vehicle body rigid member extending in the width direction.

  At a position separated from the cross member 30 in the longitudinal 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 22 and 22 on the left and right side sills 21 and 21, respectively. Cross members 31 and 31 (so-called No. 2.5 cross members) are provided as vehicle body rigid members that connect the narrow portions 8c and 8c. Here, each of the cross members 30 and 31 described above is provided so as to be orthogonal to the tunnel portion 8.

  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 21 and the left and right sides of the kick-up portion 5 The above-mentioned rear side frames 19 and 19 are attached to the lower left and right of the rear floor panel 6, 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 19 and 19. Member) 33 is attached. The cross members 32 and 33 and the rear side frame 19 described above are all vehicle body rigid members.

  As shown in FIGS. 3 and 5, the above-described rear seat 10 as a seat for the rear seat occupant Y is provided above the floor panel 4 and the rear floor panel 6. The rear seat 10 is an extension portion 18 d of the floor frame 18. Installed in the corresponding position. That is, the two seat brackets 34, 34 are attached to the panel portion corresponding to the extension 18d of the floor frame 18 and the vertical direction, and the two seat brackets 34, 34 are also attached to the rear side frame 19 and the panel portion corresponding to the vertical direction. The rear seat 10 is attached to the seat brackets 34 by being attached.

On the other hand, as shown in FIGS. 3 and 5, each front seat 9 is attached to each cross member 30, 31 having a closed cross-sectional structure spaced apart from the front and rear via a seat bracket 35 and a seat slide rail 36. It is configured.
In the figure, 37 is a front wheel, 38 is a rear wheel, and 39 is an instrument panel.

  FIG. 6 shows the structure of the 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 the shape of the wheel direction corresponding to the tunnel portion 8.

  That is, as shown in the figure, the fuel tank 40 is formed with a wide portion 40a having a large width in the vehicle width direction at a 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 below the floor panel 4, as shown in FIGS. 1-3. In this case, the upper half 40U (see FIG. 6) of the fuel tank 40 is located in the tunnel portion 8, and the lower part 40L (see FIG. 6) is located outside the lower surface of the floor panel 4 outside the vehicle. It is arranged to do.

Next, the support structure of the fuel tank 40 will be described with reference to FIGS. 4, 6, 7, and 8.
7 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 8 is a cross-sectional view taken along line BB in FIG.
In the fuel tank 40 described above, concave portions 40g and 40h (see FIG. 6) are formed corresponding to the wide portion 40a and the narrow portion 40c. Furthermore, a tunnel member inner 50 having a hat-shaped cross section is bonded and fixed to the lower surface of the wide portion 8a of the tunnel portion 8 so as to correspond to the recess 40g. The tunnel member inner 50 is a member for connecting the open side upper portion 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. The tunnel member inner 50 and the tunnel member inner 50 are connected to each other. A closed section 51 extending in the vehicle width direction is formed therebetween.

  The left and right lower end portions of the tunnel member inner 50 are also joined to the floor panel 4 on the side of the tunnel portion 8, and the extended portion of the floor frame 18 is disposed below the floor panel 4 and the tunnel member inner 50. 18c is bonded and fixed.

  The front support portion 40G (see FIG. 6) of the above-described fell tank 40 is connected to the floor via the lower tunnel member 52 that connects the lower open side of the tunnel portion 8 in the vehicle width direction at a position corresponding to the cross member 30. The frame 18 is detachably attached to the extending portion 18c.

  In this embodiment, the nut 53 is welded and fixed in advance within the closed cross section of the floor frame 18, and bolts 54 that are tightened to the nut 53 from below are used to connect the left and right ends of the lower tunnel member 52 to a pair of left and right floors. Removably attached to the extended portions 18c and 18c of the frames 18 and 18.

  Further, as shown in FIG. 8, a 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. The tunnel member inner 55 is a member for connecting the open side upper portion 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 the tunnel member inner 55 is connected to the tunnel member inner 55. A closed section 56 extending in the vehicle width direction is formed therebetween.

  The left and right lower end portions of the tunnel member inner 55 are also joined to the floor panel 4 on the side of the tunnel portion 8, and the extending portion of the floor frame 18 is disposed below the floor panel 4 and the tunnel member inner 55. 18c is bonded and fixed.

  And the support part 40H (refer FIG. 6) of the rear side of the above-mentioned fell tank 40 is via the lower tunnel member 57 which connects the downward open side of the tunnel part 8 in the vehicle width direction in the position corresponding to the cross member 31. The floor frame 18 is detachably attached to the extending portion 18c.

  In this embodiment, a nut 58 is welded and fixed in advance within the closed section of the floor frame 18, and bolts 59 that are tightened to the nut 58 from below are used to connect the left and right ends of the lower tunnel member 57 to a pair of left and right floors. Removably attached to the extended portions 18c and 18c of the frames 18 and 18.

  In short, the extending portion 18c of the floor frame 18 is connected to at least the front portion (see the wide portion 8a) and the rear portion (see the narrow portion 8c) of the tunnel portion 8, and the fuel tank 40 As shown in FIG. 6, a plurality of support portions 40G, 40H are provided at a predetermined interval in the vehicle front-rear direction, and the plurality of support portions 40G, 40H serve as a vehicle body via lower tunnel members 52, 57 at corresponding positions. The floor frame 18 is detachably attached to the extending portion 18c.

  The fuel tank 40 described above is formed so as to extend in the front-rear direction of the vehicle corresponding to the shape of the tunnel portion 8, so in this embodiment, it is also provided on the front side and the rear side of the lower tunnel members 52, 57 described above. As shown in FIGS. 2 and 4, further lower tunnel members 60 and 61 are provided, and these lower tunnel members 60 and 61 are attached to the extending portion 18 c of the floor frame 18 using attachment members such as bolts and nuts. The lower tunnel members 60 and 61 are configured to support the lower surfaces of the slim portions 40f and 40d of the fuel tank 40.

As shown in FIGS. 7 and 8, a fibrous sheet-like seal member 62 having heat resistance is interposed between the upper surface of the fuel tank 40 and the lower surface of the tunnel portion 8 and the lower surfaces of the tunnel member inners 50 and 55. It is installed.
Instead of the bottom structure of the fuel tank 40 shown in FIGS. 7 and 8, as shown in FIG. 9, the recesses 63 and 63 (however, in FIG. 9 the portions corresponding to the lower tunnel members 52 and 57 of the fuel tank 40 are not provided. Only one side is shown), and the front and rear recesses 63, 63 are supported by the lower tunnel members 52, 57, and the lower tunnel members 52, 57 are configured not to protrude downward from the lower deck of the fuel tank 40. The tunnel members 52 and 57 may be easily processed and the fuel tank 40 itself may be improved in rigidity.

  That is, by forming the above-mentioned concave portion 63, a concave rib extending in the vehicle width direction is formed at the portion where the concave portion 63 is formed, and the tank rigidity can be improved.

  2, 64 is a dash cross member, 65 in FIG. 4 is a center pillar attached to the side sill 21 at a position corresponding to the cross member 31 (so-called No. 2.5 cross member), and arrow F in FIG. A forward direction is indicated, and an arrow R indicates the rear side of the vehicle. FIG. 5 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 embodiment has a tunnel portion that protrudes upward toward the inside of the vehicle compartment 2 at the center in the vehicle width direction of the floor panel 4 that forms the lower surface of the vehicle compartment 2. 8, a fuel tank support structure for a vehicle in which a fuel tank 40 is disposed in the inner space of the tunnel portion 8 below the floor panel 4. The floor panel 4 has a floor extending in the front-rear direction of the vehicle. A frame 8 is provided, the floor frame 18 is connected to the tunnel portion 8, and a support portion 40G of the fuel tank 40 is attached to the connection portion 18a.

  According to this configuration, since the floor frame 18 as a vehicle body rigid member extending in the front-rear direction of the vehicle is connected to the tunnel portion 8, the rigidity of the tunnel portion 8 can be secured, and the connection portion 18a (floor frame) Since the support part 40G of the fuel tank 40 is attached to the 18 tunnel parts 8), the support rigidity of the fuel tank 40 can be ensured. In short, it is possible to achieve both of ensuring the rigidity of the tunnel portion 8 and ensuring the support rigidity of the fuel tank 40.

  The floor frame 18 is extended in the front-rear direction of the vehicle by a predetermined length along the side portion of the tunnel portion 8, and the support portions 40G, 40H of the fuel tank 40 are spaced apart by a predetermined interval in the front-rear direction of the vehicle. A plurality of support portions 40G and 40H are attached to the extending portion 18c of the floor frame 18.

  According to this configuration, the support portions 40G and 40H of the fuel tank 40, which are provided at a predetermined interval in the front-rear direction, are attached to the extending portion 18c of the floor frame 18 as a vehicle body rigid member. It is supported at a plurality of locations in the front and rear, thereby improving the tank support rigidity.

  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). The fuel tank 40 is formed in a shape in the vehicle width direction corresponding to the tunnel portion 8, and the floor frame 18 is connected to both the front portion and the rear portion of 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 reducing the height of the fuel tank 40 in the vertical direction as much as possible. The comfort of the vertical direction can be ensured, and the rigidity of the tunnel portion 8 can be ensured by the structure of the floor frame 18. Further, the height of the tunnel portion 8 in the vertical direction can be reduced as much as possible by the shape of the tunnel portion 8 and the fuel tank 40 described above, so that walk-through in the vehicle width direction is facilitated.

Further, the support portion 40G of the fuel tank 40 is attached to the vehicle body via a lower tunnel member 52 that connects the lower open side of the tunnel portion 8 in the vehicle width direction.
According to this configuration, since the support portion 40G of the fuel tank 40 is attached to the vehicle body via the lower tunnel member 52 described above, both the rigidity of the tunnel portion 8 and the tank support rigidity can be improved.

  In addition, a cross member 30 extending in the vehicle width direction perpendicular to the tunnel portion 8 is provided on the floor panel 4, and a support portion 40G of the fuel tank 40 is connected to the cross member 30. It is a thing.

According to this configuration, since the support portion 40G of the fuel tank 40 is connected to the cross member 30 as the vehicle body rigidity member, it is possible to improve the side collision rigidity, the vehicle body rigidity, and the tank support rigidity.

  A plurality of the cross members 30, 31 are provided apart from each other in the longitudinal direction of the vehicle, and a plurality of support portions 40G, 40H of the fuel tank 40 are connected to the plurality of cross members 30, 31. .

  According to this configuration, even if the fuel tank 40 is formed long in the front-rear direction of the vehicle corresponding to the space in the tunnel portion 8 below the floor panel 4, the fuel at the front and rear portions corresponding to the plurality of cross members 30, 31. Since the tank 40 is supported, the fuel tank 40 can be stably supported.

  Further, a rear seat 10 for a rear seat occupant is provided above the floor panel 4, and the rear seat 10 is attached to a position corresponding to the extension 18 d of the floor frame 18.

  According to this configuration, the above-described rear seat 10 is attached to the position corresponding to the extension portion 18d of the floor frame 18, so that the support rigidity of the rear seat 10 can be ensured together with the tank support rigidity.

  In addition, the front end of the floor frame 18 is connected to the rear end of the front side frame 17, and the branch frame 20 branched from the connection portion α is connected to the side sill 21.

  According to this configuration, since the branch frame 20 of the floor frame 18 is connected to the side sill 21, it is possible to improve the floor rigidity and the torsional rigidity of the vehicle body, as well as the frontal collision of the vehicle and the offset collision from the frontal direction. Since the impact load at the time is transmitted to the side sill 21 via the front side frame 17 and the branch frame 20, it is advantageous also for a normal collision.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The front portion having a large width in the vehicle width direction of the tunnel portion of the present invention corresponds to the wide portion 8a of the embodiment,
Similarly,
The rear part with a narrow width in the vehicle width direction corresponds to the narrow part 8c,
The tunnel members correspond to the lower tunnel members 52 and 57, the occupant seats correspond to the rear seats 10,
The front frame corresponds to the front side frame 17,
The branching unit corresponds to the branching frame 20,
The tunnel member corresponds to the lower tunnel members 52 and 57, and the fuel tank corresponds to the fuel tank 40.
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 perspective view which abbreviate | omits a floor panel, a tunnel part, and a rear floor panel, and shows a vehicle body structure. The top view shown in the state which made the passenger seat a seat arrangement. The perspective view of 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. Sectional drawing which shows the other Example of the bottom part structure of a fuel tank.

Explanation of symbols

2 ... Vehicle compartment 4 ... Floor panel 8 ... Tunnel part 8a ... Wide part (front)
8c: Narrow part (rear part)
10 ... Rear seat (seat)
17 ... Front side frame (front frame)
18 ... Floor frame 18a ... Connection part 18c ... Extension part 18d ... Extension part 20 ... Branch frame (branch part)
21 ... Side sill 30,31 ... Cross member 40 ... Fuel tank (fuel tank)
40G, 40H ... support part 52, 57 ... lower tunnel member (tunnel member)
α ... Connection

Claims (8)

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 arranged in the space in the tunnel portion below the floor panel,
The floor panel is provided with a floor frame extending in the longitudinal direction of the vehicle,
A fuel tank support structure for a vehicle, wherein the floor frame is connected to the tunnel portion, and a fuel tank support portion is attached to the connection portion. The floor frame extends in the front-rear direction of the vehicle for a predetermined length along the side portion of the tunnel portion,
A plurality of support portions of the fuel tank are provided at predetermined intervals in the longitudinal direction of the vehicle,
The fuel tank support structure for a vehicle according to claim 1, wherein a plurality of support portions are attached to the extending portion of the floor frame. 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,
3. The fuel tank support structure for a vehicle according to claim 1, wherein the floor frame is connected to both the front portion and the rear portion of the tunnel portion. The fuel tank support structure for a vehicle according to any one of claims 1 to 3, wherein the support portion of the fuel tank is attached to the vehicle body via a tunnel member that connects a lower open side of the tunnel portion in the vehicle width direction. . The upper part of the floor panel is provided with a cross member extending in the vehicle width direction perpendicular to the tunnel portion,
The fuel tank support structure for a vehicle according to any one of claims 1 to 4, wherein a support portion of a fuel tank is connected to the cross member. A plurality of the cross members are provided apart in the longitudinal direction of the vehicle,
6. The fuel tank support structure for a vehicle according to claim 5, wherein a plurality of support portions of the fuel tank are connected to the plurality of cross members. The vehicle fuel tank support structure according to any one of claims 1 to 6, wherein a seat for an occupant is provided above the floor panel, and the seat is attached to a position corresponding to an extension of the floor frame. The fuel tank support structure for a vehicle according to any one of claims 1 to 7, wherein a front end of the floor frame is connected to a rear end of the front frame, and a branch portion branched from the connection portion is connected to a side sill. .

Images