JP4091628B2 - Vehicle fuel tank arrangement structure - Google Patents

Description

  The present invention relates to a vehicle fuel tank arrangement structure.

Conventionally, there is the following technique as an arrangement structure of a fuel tank for a vehicle (see, for example, Patent Document 1).
JP-A-6-106999

  According to FIG. 5 of the publication, the above-mentioned conventional technique arranges the fuel tank 1 (the number is cited in the publication, the same applies hereinafter) below the rear seat and under the floor. It is bolted.

  Thus, in a general passenger car, the fuel tank is disposed at the rear of the vehicle, such as below or behind the rear seat, behind the rear axle. In such a fuel tank arrangement structure, the driver does not care about the fuel rocking noise (the sound generated when the fuel in the fuel tank shakes).

  Furthermore, in such a fuel tank arrangement structure, the fuel injected from the fuel injection port on the rear side of the vehicle body is filled into the fuel tank 1 via a filler pipe (not shown). Since there are the fuel tank 1 and the fuel inlet at the rear of the vehicle body, there is no need to pass a filler pipe under the floor.

  In recent years, it has been desired to further increase the vehicle interior space while maintaining the size of the vehicle body. In particular, in a so-called two-box car (engine room + cabin) where there is no partition between the cabin and the trunk room, it is desired to increase the luggage storage space at the rear of the vehicle. However, there is a limit when the fuel tank is arranged at the rear of the vehicle as in the prior art, and it is desired to arrange the fuel tank at a different location from the rear of the vehicle.

  It is an object of the present invention to provide a technology that can change the arrangement of the fuel tank and further widen the vehicle interior space.

The invention according to claim 1 is a vehicle having a cabin between a front axle and a rear axle, and having a driver seat and a passenger seat in the cabin, below the driver seat and the passenger seat and below the floor. A fuel tank is arranged, the floor panel is bulged upward below the driver seat and the passenger seat, and the fuel tank is disposed inside the bulged portion so that the entire length in the front-rear direction is accommodated. pass over the middle cross member between the rear of the left and right sides of the side sill, the dashboard lower toward a middle cross member, through an elongated floor tunnel back and forth in the vehicle width central portion, and the floor tunnel, with respect to the vehicle traveling direction of the floor tunnel and the bulging portion of the right and left sides portions, characterized by being formed integrally with the floor panel.
There is usually space under the driver's or passenger seat of the vehicle. Since the fuel tank has been arranged to make effective use of this space, the space under the rear seat is vacant. Accordingly, the space in the cabin can be further increased by lowering the lower part of the rear seat in the floor panel.

In the invention according to claim 2, the bulging portion includes a front vertical wall portion, a horizontal portion, and a rear vertical wall portion in a side sectional view, and the front vertical wall portion and the rear vertical wall portion are arranged on both left and right sides. The side sill and the floor tunnel are connected to each other.

In the invention according to claim 1, the fuel tank is arranged below the driver seat and the passenger seat and below the floor, and the floor panel is bulged upward below the driver seat and the passenger seat, by arranging to fit the entire fuel tank of the longitudinal direction length towards, by effectively utilizing the space under the driver's seat and front passenger seat, since the arrangement of the fuel tank, is possible to widen the cabin space it can. For this reason, the luggage storage space is also widened.
That is, I'll to effectively utilize free space from under the driver's seat and the passenger seat to the floor, without narrowing the cabin space, and, to ensure a lower surface level (ground clearance) of the fuel tank it can.

Furthermore, it swelled the floor panel upward, so arranged so that the whole fuel tank before-rear direction length inward bulges fit, to obtain a fuel tank of a conventional the same capacity, The fuel tank can be made thinner by the amount of penetration, and as a result, the lower level of the fuel tank can be raised. Therefore, there is no need to cover the lower surface because there is no fear that the fuel tank will be grounded or chipped (lightly hitting a protrusion on the road surface).

  In addition, when there is a driver's seat and a passenger seat in the vicinity of the longitudinal center of the vehicle body, which is the center of gravity of the vehicle body, a heavy fuel tank is placed under these seats, so the vehicle's center of gravity lowers and the vehicle turns The moment of inertia around the center of gravity of the vehicle at times is reduced, and the vehicle motion performance is improved. Moreover, since the fuel tank is arranged in the vicinity of the longitudinal center of the vehicle body, only the front and rear of the vehicle body frame need be changed between the case where the engine is arranged in front of the vehicle body frame and the case where the engine is arranged behind the vehicle body frame. Therefore, the productivity of the body frame is increased.

In the invention according to claim 2, the bulging portion is constituted by a front vertical wall portion, a horizontal portion, and a rear vertical wall portion in a side sectional view, and the vehicle body is formed by the front vertical wall portion and the rear vertical wall portion . Since the left and right side sills and the floor tunnel are connected to each other, the rigidity of the body frame can be increased.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is front, Rr is rear, L is left, R is right Indicates. The drawings are viewed in the direction of the reference numerals.

FIG. 1 is a schematic side view of a vehicle according to the present invention, and shows a vehicle 1 called a “minivan type”.
The vehicle 1 is a so-called two-box car including an engine room and a cabin, which includes a tailgate and has no partition between the cabin and the trunk chamber. Specifically, the vehicle 1 is equipped with an engine 3 indicated by an imaginary line at the front of a body frame (vehicle body) 2, and has a cabin (vehicle compartment) 6 between a front axle 4 and a rear axle 5, and a driver's seat 7 and a passenger seat 8 (behind the driver's seat 7 in this figure) and under the floor, a fuel tank 9 is arranged, and the fuel tank 9 is covered with a floor panel 11 stretched on the vehicle body frame 2, and the floor panel 11 is a trunk portion 12.
In the figure, 13 is a front wheel, 14 is a rear wheel, and 15 is a rear seat.

FIG. 2 is a plan view of the vehicle body frame according to the present invention, showing a state in which the floor panel 11 is removed. However, for convenience of explanation, only the floor tunnel 16 of the floor panel 11 is indicated by an imaginary line.
The vehicle body frame 2 includes front side frames 21 and 21 extending in the front-rear direction on both sides of the front part, a front cross member 22 spanned between the front parts of the front side frames 21 and 21, and a vehicle of the front side frames 21 and 21. Upper members 23, 23 arranged on the outer side in the width direction and obliquely above and extending in the longitudinal direction of the vehicle body, side sills 24, 24 joined to the rear portions of the upper members 23, 23, and rear side frames extending rearward from the rear portions of the side sills 24, 24 25, 25, a middle cross member 26 spanned between the rear portions of the side sills 24, 24, and a rear cross member 27 spanned between the rear portions of the rear side frames 25, 25 are the main components.

  In addition, the vehicle body frame 2 includes four underfloor reinforcing members (floor frames) 31 to 34 in a substantially parallel beam shape in plan view at the vehicle body longitudinal center and the vehicle width center in order to reinforce the floor panel 11 (see FIG. 1). It was passed through. Specifically, these underfloor reinforcing members 31 to 34 are arranged between the left and right side sills 24 and 24, the front floor frame 31 and the rear floor frame 32, the rear portions of the front side frames 21 and 21, and the middle cross member 26. These are a left side floor frame 33 and a right side floor frame 34 spanned between the two.

The present invention is characterized in that the fuel tank 9 is arranged in a space S1 surrounded by four underfloor reinforcing members 31 to 34 in the front, rear, left and right. That is, the front, rear, left and right sides of the fuel tank 9 were surrounded by the four underfloor reinforcing members 31 to 34.
The floor panel (floor) 11 is reinforced by the underfloor reinforcing members 31 to 34 surrounding the front, rear, left and right of the fuel tank 9. Since the fuel tank 9 is heavy, reinforcing the portion that supports the fuel tank 9 can make the floor rich in rigidity while suppressing an increase in the weight of the entire floor.

  The underfloor reinforcing members 31 to 34 that surround the fuel tank 9 are not limited to the configuration that surrounds the entire front, rear, left, and right of the fuel tank 9, and surround at least one of the front, rear, left, or right of the fuel tank 9. It may be a configuration. For example, (1) a configuration in which the left side of the fuel tank 9 is surrounded by the left side floor frame 33, (2) a configuration in which the left and right side floor frames 33 and 34 surround the left and right of the fuel tank 9, or (3) the front Alternatively, the front, left and right sides of the fuel tank 9 may be surrounded by the left, right, and right side floor frames 31, 33, 34. Even in such a configuration, by reinforcing the portion supporting the fuel tank 9, it is possible to make the floor rich in rigidity while suppressing an increase in the weight of the entire floor.

The floor tunnel 16 extends from the dashboard lower 35 to the middle cross member 26 in a longitudinally elongated tunnel passing through the vicinity of the center of the vehicle width, that is, a tunnel extending in the front-rear direction at the lateral center of the cabin 6 (see FIG. 1). It is. For this reason, the floor tunnel 16 passes above the fuel tank 9.
By the way, the vehicle 1 is a front engine / front wheel drive type vehicle (FF vehicle) and does not pass the propeller shaft through the floor tunnel 16. The floor tunnel 16 in this case is provided for the purpose of increasing the rigidity of the floor panel 11.
In the figure, 36 is a front damper housing, and 37 and 37 are side outriggers.

  FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. The floor panel 11 is bulged upward below the driver seat 7 and the passenger seat 8, and the bulged portion 41 covers the upper portion of the fuel tank 9. It shows that. The bulging portion 41 includes a front vertical wall portion 43 extending obliquely upward and rearward from the front seat floor portion 42 in a side sectional view, a horizontal portion 44 extending substantially horizontally rearward from the front vertical wall portion 43, and a horizontal portion 44. And a rear vertical wall portion 45 extending obliquely downward and rearward and continuing to the rear seat floor portion 46.

FIG. 4 is a perspective view of an essential part of the vehicle body frame according to the present invention and shows the periphery of the bulging portion 41 of the floor panel 11.
The floor panel 11 is formed by integrally forming a floor tunnel 16 projecting toward the cabin side (upward in the drawing) and bulging portions 41 and 41 on both sides of the floor tunnel 16. Since the side sills 24, 24 on both sides are connected by the front / rear vertical wall portions 43, 45 of the bulging portions 41, 41, the rigidity of the body frame 2 is increased.

  FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 2. The floor panel 11 is stretched between the left and right side sills 24, 24, the floor tunnel 16 is passed between the driver seat 7 and the passenger seat 8. A fuel tank 9 is arranged below the passenger seat 8 and below the floor, and at least a part (the upper center portion) of the fuel tank 9 bulges upward, and the upper bulging portion 9a enters the floor tunnel 16. It shows that.

Moreover, this figure shows about following (1)-(3).
(1) Four underfloor reinforcing members 31 to 34 (only two on the left and right are shown in the figure) attached to the lower surface of the floor panel 11 are extended to a level L below the lower surface 9 b of the fuel tank 9. Since the lower surface 9b of the fuel tank 9 is higher than the lower surfaces of the underfloor reinforcing members 31 to 34, there is no concern that the fuel tank 9 is grounded. It should be noted that at least one of the four underfloor reinforcing members 31 to 34 only needs to extend below the lower surface 9 b of the fuel tank 9.

  (2) The engine exhaust pipe 47 is placed along the left side floor frame (underfloor reinforcing member) 33, and the exhaust pipe 47 and the fuel tank 9 are separated by the left side floor frame 33. The heat of the exhaust pipe 47 can be shielded by the left side floor frame 33 to reduce heat conduction to the fuel tank 9.

  (3) It shows that the engine fuel pipe 48 is placed along the right side floor frame (underfloor reinforcement member) 34. The fuel pipe 48 can be concentrated in the vicinity of the fuel tank 9 and shortened. Reference numeral 49 denotes a fuel pipe stay.

Next, the effect | action of the arrangement structure of the fuel tank for vehicles is demonstrated based on FIG.1 and FIG.6.
As shown in FIG. 1, a vehicle 1 having two rows of front and rear seats generally has a front seat (driver's seat 7 and front passenger seat 8) in the vicinity of the longitudinal center of the body frame 2, and the center of gravity of the vehicle body is located at this position. . Since the heavy fuel tank 9 is disposed below the driver's seat 7 and the passenger seat 8, the fuel tank 9 is at a low position near the center of gravity of the vehicle body. As a result, the center of gravity of the vehicle 1 is lowered, the moment of inertia around the center of gravity of the vehicle during turning is reduced, and the vehicle motion performance is improved.

  Furthermore, since the fuel tank 9 is disposed in the vicinity of the longitudinal center of the vehicle body, only the front and rear of the vehicle body frame 2 need be changed between when the engine 3 is disposed in front of the vehicle body frame 2 and when it is disposed behind the vehicle body frame 2. Therefore, the productivity of the body frame 2 is increased.

  The above description is summarized as follows.
  In the present invention, as shown in FIGS. 1 to 5, a driver seat 7 and a passenger seat 8 that are provided in the cabin 6. The fuel tank 9 is disposed below the floor 11 and below the floor 11, and below the driver seat 7 and the passenger seat 8. The panel 11 is bulged upward (see FIGS. 3 and 4) and burns inwardly of the bulged portions 41, 41. The fuel tank 9 is arranged so that the entire length in the front-rear direction can be accommodated (see FIGS. 3 and 4). As a result, the fuel tank 9 is arranged by effectively using the space under the driver's seat 7 and the passenger seat 8. The space in the cabin 6 can be expanded. For this reason, the luggage storage space also becomes wide .
  That is, the vacant space from under the driver's seat 7 and the passenger seat 8 to the floor 11 is effectively used. As a result, the space in the cabin 6 is not reduced and the bottom surface of the fuel tank 9 is reduced. A bell (ground clearance) can be secured.

  Further, the floor panel 11 is bulged upward and the fuel is inwardly of the bulged portions 41, 41. Since the tank 9 is arranged so that its entire length in the front-rear direction can be accommodated, As a result, the fuel tank 9 can be made thin as much as it is inserted. The lower surface level of the fuel tank 9 can be raised. Therefore, the fuel tank 9 There is no need to cover the lower surface because there is no worry of chipping (light hitting on the road surface).

  Furthermore, in the present invention, as shown in FIGS. Because the left and right side sills 24, 24 and the floor tunnel 16 are connected The rigidity of the body frame 2 can be increased.

6 (a) and 6 (b) are operation explanatory views of the vehicle fuel tank arrangement structure according to the present invention.
As shown in (a), the space below the driver's seat 7 and the passenger seat 8 is usually an empty space. The fuel tank 9 was arranged by effectively using this empty space. Conventionally, a fuel tank has been arranged below the rear seat 15 and under the floor. Since the arrangement of the fuel tank 9 has been changed, the space under the rear seat 15 is vacant. Accordingly, the floor panel 11 can be lowered below the rear seat 15. Alternatively, a large space S2 can be secured under the rear seat 15. Normally, this space S2 can be used effectively as a luggage storage space.

  (B) shows the state in which the rear seat 15 is completely folded up to the height of the floor panel 11 and stored in the space S2. The height of the floor panel 11 is the same low level as the upper surface of the side sill 24. Since the height of the seat back 15a of the rear seat 15 that is tilted forward is substantially the same as that of the trunk portion 12, a wide rear storage space S3 can be secured in the rear portion of the vehicle 1 very easily. Therefore, it is not necessary to remove the rear seat 15 in order to expand the rear storage space S3.

FIG. 7 is a side sectional view showing a fuel tank mounting example (first example) according to the present invention. The fuel tank 9 is placed on the vehicle body reinforcing subframe 51, bolted with a band 54, and further subframe 51 is mounted. Is coupled to the vehicle body frame 2.
The fuel tank 9 is disposed with a predetermined gap δ between the fuel tank 9 and the floor panel 11. By providing the gap δ, air is interposed, so that sound insulation is enhanced, and fuel oscillation noise (sound generated by shaking the fuel in the fuel tank) or the like is not easily transmitted to the cabin 6. Therefore, the habitability of the cabin 6 is enhanced.

FIG. 8 is a bottom view showing a fuel tank mounting example (first example) according to the present invention.
The sub frame 51 includes a cross member portion 52 that spans the left and right side outriggers 37, 37 of the vehicle body frame 2, and left and right beam portions 53 that extend from the cross member portion 52 to the rear and are coupled to the rear floor frame 32. 53.

FIG. 9 is an exploded perspective view showing a fuel tank mounting example (first example) according to the present invention.
In order to attach the fuel tank 9 to the vehicle body frame 2, first, the fuel tank 9 is mounted on the subframe 51, two bands 54, 54 are hung on the left and right upper portions of the fuel tank 9, and these bands 54, 54 are connected to the subframe 51. The frame 51 is coupled with bolts 55 (... indicates a plurality, the same shall apply hereinafter). Next, the subframe 51 is applied to the lower surface of the side outrigger 37 and the lower surface of the rear floor frame 32, and is coupled by bolts 56.

  In this way, the vehicle body reinforcing subframe 51 with the fuel tank 9 assembled in advance is attached to the vehicle body frame 2, so that the assemblability is better than when assembled separately. Moreover, since the fuel tank 9 is assembled to the subframe 51, the width dimension of the fuel tank 9 can be brought close to the vehicle width dimension of the body frame 2 without being restricted by the framework of the body frame 2. As a result, the tank capacity can be increased. Furthermore, since the vehicle body frame 2 is reinforced by the sub-frame 51, the rigidity of the vehicle body frame 2 is increased. The sub-frame 51 on which the fuel tank 9 is placed can protect the lower surface of the fuel tank 9.

10 (a) and 10 (b) are modified views of the arrangement structure of the vehicle fuel tank according to the present invention, (a) is a schematic side view of the vehicle, and (b) is a plan view of the vehicle body frame according to the present invention. FIG.
The vehicle 1 of this modification is a so-called hybrid type vehicle using both the engine 3 and the electric motor 61 as a driving power source. The electric motor 61 is disposed in the vicinity of the engine 3 and the rear seat 15 is provided below. A power supply source (for example, a battery or a fuel cell) 62 of the electric motor 61 is arranged in the above. Specifically, since the fuel tank 9 is disposed below the driver seat 7 and the passenger seat 8 and under the floor, the space below the rear seat 15 is vacant. The wide space S2 under the rear seat 15 was effectively utilized as a power supply source storage space.

As a result, a special space for arranging the power supply source 62 is not necessary. Therefore, a cabin space equivalent to that of the vehicle in which the fuel tank is arranged under the conventional rear seat 15 can be easily secured.
Moreover, since the power supply source 62 is housed in the space S2 below the rear seat 15, the conventional body frame 2 can be used as it is, and productivity is increased.
Furthermore, since both the fuel tank 9 and the power supply source 62 are arranged on the floor portion, the center of gravity of the vehicle is low.
Other configurations are the same as the configurations shown in FIGS. 1 to 9 described above, and the same reference numerals are given and description thereof is omitted.

  FIG. 11 is a side sectional view showing a fuel tank mounting example (second example) according to the present invention. The floor panel 11 is bulged upward below the driver's seat 7 and the passenger's seat 8, and its bulged portion. 41 shows that the upper part of the fuel tank 9 was covered. The bulging portion 41 includes a front vertical wall portion 43 extending obliquely upward and rearward from the front seat floor portion 42 in a side sectional view, a horizontal portion 44 extending substantially horizontally rearward from the front vertical wall portion 43, and a horizontal portion 44. And a rear vertical wall portion 45 extending obliquely downward and rearward and continuing to the rear seat floor portion 46.

  This figure also shows that the fuel tank 9 is placed on the subframe 51, and is covered with a sound insulation plate 58 and bolted, and the subframe 51 is bolted to the lower part of the vehicle body frame 2. That is, a sound insulating plate 58 is attached below the floor below the driver's seat 7 and the passenger seat 8 with a predetermined gap δ from the floor 11, and the fuel tank 9 is disposed below the sound insulating plate 58, thereby The tank 9 is attached to the vehicle body side via a sound insulating plate 58.

  The shape of the sound insulating plate 58 is arbitrary, preferably a shape that covers the entire upper surface of the fuel tank 9, and more preferably a shape that covers the entire fuel tank 9. Further, as the material of the sound insulating plate 58, the same material as the floor panel 11, a general steel plate, a sound absorbing material, or the like may be set as appropriate.

The double structure with a predetermined gap δ between the floor panel 11 and the sound insulation plate 58 provides good sound insulation, and fuel oscillation noise (sound generated when the fuel in the fuel tank 9 sways) or the like is generated in the cabin 6. It is difficult to communicate. Therefore, the habitability of the cabin 6 is enhanced.
By the way, the fuel tank 9 has the upper surface 9c applied to the sound insulating plate 58. For this reason, the height from the floor panel 11 to the fuel tank 9 can be reduced.

12 is a cross-sectional view taken along the line 12-12 in FIG. 11. The floor panel 11 is stretched between the left and right side sills 24, 24, the floor tunnel 16 is passed between the driver seat 7 and the passenger seat 8, and the driver seat 7 A fuel tank 9 is arranged below the passenger seat 8 and below the floor, and at least a part (the upper center portion) of the fuel tank 9 bulges upward, and the upper bulging portion 9a enters the floor tunnel 16. It shows that.
This figure also shows that the entire upper surface of the fuel tank 9 is covered with a sound insulating plate 58.

FIG. 13 is a side sectional view showing a fuel tank mounting example (third example) according to the present invention. The configuration of the third example is characterized in that a sound absorbing material (for example, glass wool) 59 is filled in the gap δ between the floor panel 11 and the sound insulating plate 58. If it is a double structure in which the sound absorbing material 59 is interposed, the sound insulation is further enhanced.
About another structure, it is the same as the structure of embodiment shown in the said FIGS. 1-12, attaches | subjects the same code | symbol and abbreviate | omits the description.

FIG. 14 is a perspective view showing a fuel tank, a fuel filling system, a brake system, and a parking brake system according to the present invention.
The fuel filling system 70 for filling the fuel tank 9 fills the fuel tank 9 with the fuel injected from the fuel inlet 71 provided on the rear side portion of the vehicle 1 via the filler pipe 72. This air is discharged to the vicinity of the fuel inlet 71 through the breather pipe 73. The present invention is characterized in that the filler pipe 72 and the breather pipe 73 are piped from the fuel inlet 71 to the fuel tank 9 through the floor tunnel 16 indicated by an imaginary line.

  The brake system 80 operates the booster (master power) 82 with the brake pedal 81, thereby causing the front brakes 86, 86 of the front wheels 13, 13 from the master cylinder 83 via the two front brake fluid pipes 84, 85. The hydraulic pressure is applied to the rear brake 89 of the rear wheels 14 and 14 via the two rear brake fluid pipes 87 and 88.

The parking brake system 90 transmits the operating force of the hand brake lever 91 to the rear brakes 89 of the rear wheels 14 and 14 via the two parking brake wires 92 and 93.
The present invention is characterized in that the rear brake fluid pipes 87 and 88 and the parking brake wires 92 and 93 are passed through the floor tunnel 16.

FIG. 15 is a side sectional view showing the relationship between a floor tunnel and a fuel tank, a fuel filling system, a brake system, and a parking brake system according to the present invention. A hand brake lever 91 is disposed in the vicinity of the fuel tank 9, and this hand brake is shown. The parking brake wires 92 and 93 connected to the lever 91 are drawn into the floor tunnel 16.
This figure also shows that the filler pipe 72, breather pipe 73, rear brake fluid pipes 87 and 88, and parking brake wires 92 and 93 extend to the rear portion of the floor panel 11 after passing through the floor tunnel 16.

  16 is a cross-sectional view taken along the line 16-16 in FIG. 15 and shows that the filler pipe 72, the breather pipe 73, the rear brake fluid pipes 87 and 88, and the parking brake wires 92 and 93 are passed through the floor tunnel 16.

  FIG. 17 is a main part plan view showing the relationship between the floor tunnel and the fuel tank, the fuel filling system, the brake system, and the parking brake system according to the present invention. The filler pipe 72 connected to the rear part of the fuel tank 9 and the fuel tank 9 This shows that the breather pipe 73 connected to the upper part, the rear brake fluid pipes 87 and 88 bypassing the side of the fuel tank 9 from the front of the vehicle, and the parking brake wires 92 and 93 are arranged in the floor tunnel 16.

  Next, based on FIG. 14, the effect | action by having passed the filler pipe 72, the breather pipe 73, the rear brake fluid pipes 87 and 88, and the parking brake wires 92 and 93 through the floor tunnel 16 is demonstrated.

  A floor tunnel 16 passes through the position of the fuel tank 9. The floor tunnel 16 protrudes from the floor surface toward the cabin 6 and has relatively high rigidity. Since the filler pipe 72 and the breather pipe 73 are piped to the fuel tank 9 through the space of the floor tunnel 16 as described above, the piping is easy. Similarly, since the piping of the rear brake fluid pipes 87 and 88 and the wiring of the parking brake wires 92 and 93 are wired through the space of the floor tunnel 16, the piping and wiring are easy.

Moreover, since the filler pipe 72, the breather pipe 73, the rear brake fluid pipes 87 and 88, and the parking brake wires 92 and 93 are in the floor tunnel 16, they pass above the floor surface, regardless of the traveling state. Do not worry about grounding or chipping (light hitting on the road surface).
In addition, attachment stays (not shown) of the filler pipe 72, the breather pipe 73, the rear brake fluid pipes 87, 88, and the parking brake wires 92, 93 can be integrated.

  In the above-described embodiment and modification of the present invention, whether the propeller shaft is passed through the floor tunnel 16 is arbitrary.

1 is a schematic side view of a vehicle according to the present invention. It is a top view of the body frame concerning the present invention. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a principal part perspective view of the vehicle body frame which concerns on this invention. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is operation | movement explanatory drawing of the arrangement structure of the fuel tank for vehicles which concerns on this invention. It is side surface sectional drawing which shows the fuel tank attachment example (1st example) which concerns on this invention. It is a bottom view which shows the fuel tank attachment example (1st example) which concerns on this invention. It is a disassembled perspective view which shows the fuel tank attachment example (1st example) which concerns on this invention. It is a modification figure of the arrangement structure of the fuel tank for vehicles which concerns on this invention. It is side surface sectional drawing which shows the fuel tank attachment example (2nd example) which concerns on this invention. 12 is a sectional view taken along line 12-12 of FIG. It is side surface sectional drawing which shows the fuel tank attachment example (3rd example) which concerns on this invention. 1 is a perspective view showing a fuel tank, a fuel filling system, a brake system, and a parking brake system according to the present invention. It is side surface sectional drawing which shows the relationship between the floor tunnel which concerns on this invention, a fuel tank, a fuel filling system, a brake system, and a parking brake system. FIG. 16 is a cross-sectional view taken along line 16-16 in FIG. 15. It is a principal part top view which shows the relationship between the floor tunnel which concerns on this invention, a fuel tank, a fuel filling system, a brake system, and a parking brake system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 4 ... Front axle, 5 ... Rear axle, 6 ... Cabin, 7 ... Driver's seat, 8 ... Passenger seat, 9 ... Fuel tank, 9a ... A part of fuel tank (upper bulge part), 11 ... Floor (Floor panel), 12 ... trunk portion, 16 ... floor tunnel, 24 ... side sill, 31-34 ... front / rear / left side / right side floor frame as under-floor reinforcing member, 41 ... bulge portion, 47 ... exhaust Pipe 48, fuel pipe 51, body frame reinforcing subframe 58 58 sound insulation plate 59 sound absorbing material 61 electric motor 62 electric power source 72 filler pipe 73 breather pipe 84 85 87, 88 ... brake fluid pipe, 92, 93 ... parking brake wire, S1, S2, S4 ... space, S3 ... rear space, δ ... gap.

Claims (2)

In a vehicle having a cabin between the front axle and the rear axle, and having a driver seat and a passenger seat in the cabin,
A fuel tank is arranged below the driver seat and the passenger seat and under the floor,
The floor panel is bulged upward below the driver seat and the passenger seat,
The fuel tank is disposed inside the bulging portion so that the entire length in the front-rear direction is accommodated,
The middle cross member is bridged between the rear parts of the left and right side sills on the vehicle body,
From the dashboard lower to the middle cross member, through the floor tunnel elongated in the front and rear near the center of the vehicle width,
The floor tunnel and the arrangement structure of the a bulge portion, the vehicle fuel tank, characterized in that formed integrally with the floor panel of the left and right side portions with respect to the vehicle traveling direction of the floor tunnel. The bulging portion is composed of a front vertical wall portion and a horizontal portion and a rear vertical wall portion in a side cross-sectional view, these front vertical wall portion and the rear vertical wall, the said right and left sides of the side sills floor tunnel The vehicle fuel tank arrangement structure according to claim 1, wherein the two are connected to each other.

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