JP2015101214A - Fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel tank inhibiting or preventing fuel leakage in fuel discharge.SOLUTION: In a fuel tank 10, projecting parts 28, 30 projecting to a side of a heat insulation layer 20 from a fuel tank body 16 and an insulator 22 are formed at a gap 24 between the fuel tank body 16 and the heat insulation layer 20 and a gap 26 between the heat insulation layer 20 and the insulator 22 so as to surround a hole-forming area in a bottom surface view. When a hole 46 for extracting fuel is formed in the hole-forming area, even when gasoline 18 invades into the gaps 24, 26 from the hole 46, the gasoline is banked up by the projecting parts 28, 30 because the gaps 24, 26 are blocked by the projecting parts 28, 30, and therefore the gasoline is prevented from being more spread inside the gaps 24, 26.

Description

  The present invention relates to a fuel tank for a vehicle.

  Conventionally, when a vehicle is to be discarded, a hole is made in the bottom wall of a fuel tank attached to the vehicle with a puncture tool, and fuel remaining in the fuel tank is discharged to the outside from the hole and collected. Has been done. At this time, the bottom wall of the fuel tank is provided with a marking or the like indicating the hole forming position and a recess or the like for guiding the tool so that the hole can be formed at an appropriate predetermined position. For example, see Patent Document 1).

JP 2004-9827 A JP 2009-18775 A JP 2003-118403 A

  Incidentally, some recent fuel tanks have a three-layer structure in which a heat insulating layer and an insulator layer are laminated on the outside of the tank body in order to suppress an increase in fuel temperature. In the fuel tank having such a three-layer structure, when the fuel is discharged from the hole, the fuel enters and diffuses into the gap between the tank body and the heat insulating layer, or the gap between the heat insulating layer and the insulator, There was a risk that the fuel recovery efficiency would decrease.

  The present invention has been made in view of the above problems, and an object thereof is to provide a fuel tank that suppresses or prevents fuel from entering and diffusing into a gap between layers stacked on the fuel tank when the fuel is discharged. And

  In order to solve the above-described problem, the fuel tank according to claim 1 is provided with a plurality of stacked layers made of different materials constituting a bottom wall of the fuel tank and at least one gap between the adjacent layers. And at least a dam provided around the hole forming region for removing fuel in a bottom view.

  In the fuel tank, fuel is discharged from the inside of the fuel tank to the outside through the hole by punching the hole forming region of the bottom wall with a puncture tool. At this time, the fuel may enter and diffuse through the gaps between the plurality of stacked layers constituting the bottom wall. However, in this fuel tank, since at least one gap between the plurality of layers constituting the bottom wall is provided with a weir portion surrounding the periphery of the hole forming region in the bottom view, the fuel that has entered the gap is not It is blocked or prevented from diffusing by the part.

  According to a second aspect of the present invention, in the fuel tank according to the first aspect, the dam portion is a convex portion formed to project from at least one of the layers constituting the gap toward the other layer.

  In this fuel tank, a convex portion is formed so as to protrude from at least one layer constituting the gap toward the other layer around the hole forming region in the bottom view. Therefore, when the hole formation region of the fuel tank is drilled with a puncture tool, the fuel that has entered the gap formed with the projection from the hole is blocked by the projection and is prevented from spreading outside the projection. Is prevented.

  A fuel tank according to a third aspect is the fuel tank according to the first or second aspect, wherein the weir portion is a concave portion provided in the layer and recessed downward in the direction of gravity.

  According to this fuel tank, a recess is formed in the layer that is recessed downward in the direction of gravity around at least the hole forming region in the bottom view. Therefore, when the hole forming region of the fuel tank is drilled with a puncture tool, the fuel that has entered from the hole into the gap between the layer formed with the recess and the layer facing the recess is accommodated in the recess, and the outside of the recess It is suppressed or prevented from diffusing.

  The fuel tank according to claim 4 is the fuel tank according to any one of claims 1 to 3, wherein the weir portion is an adhesive that closes the gap.

  According to this fuel tank, at least one gap between the layers is closed with the adhesive around the hole forming region in the bottom view. Therefore, when the hole forming region of the fuel tank is drilled with the puncture tool, the fuel that has entered the gap between the layers from the hole is blocked by the adhesive, and is prevented or prevented from diffusing outside the adhesive.

  According to a fifth aspect of the present invention, there is provided a fuel tank for removing fuel in a bottom view in at least one gap between a plurality of layers made of different materials constituting a bottom wall of the fuel tank and a gap between the adjacent layers. A gap closing member provided in a region including the hole forming region.

  According to this fuel tank, since the gap closing member is provided in the region including the hole forming region for fuel extraction in the bottom view in the gap between the layers, when the hole is formed in the bottom wall of the fuel tank, The hole passes through the center of the gap closing member. As a result, the gap closing member is located in the portion of the gap facing the hole. Therefore, the fuel cannot enter the gap between the layers provided with the gap closing member, and the fuel is suppressed or prevented from diffusing into the gap.

  As described above in detail, according to the present invention, when fuel is taken out from the fuel tank, it is possible to suppress or prevent the fuel from diffusing into gaps between a plurality of layers constituting the bottom wall of the fuel tank.

It is a figure which shows the bottom part of the fuel tank and fuel extraction apparatus which concern on 1st Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the state before fuel extraction of the fuel tank which concerns on 1st Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the fuel extraction operation state of the fuel tank which concerns on 1st Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the state before fuel extraction of the fuel tank which concerns on 2nd Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the fuel extraction operation state of the fuel tank which concerns on 2nd Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the state before fuel extraction of the fuel tank which concerns on 3rd Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the fuel extraction operation state of the fuel tank which concerns on 3rd Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the state before fuel extraction of the fuel tank which concerns on 4th Embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the state before fuel extraction of the fuel tank which concerns on 5th Embodiment of this invention.

[First Embodiment]
A fuel tank according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing a bottom of a fuel tank and a fuel extraction device according to the present embodiment, and FIGS. 2 and 3 respectively show a state before the fuel extraction operation and a fuel extraction operation state of the fuel tank according to the present embodiment. It is principal part sectional drawing. Note that the gaps in the drawings of the following embodiments are exaggerated for convenience of explanation.

  As shown in FIG. 1, a fuel tank 10 for storing fuel such as gasoline of a vehicle constitutes a closed space 14 with a wall (not shown) including a bottom wall 12 and stores gasoline 18 as fuel therein. It is.

  As shown in FIG. 1, the fuel tank 10 includes a fuel tank body 16, a heat insulating layer 20 made of a porous body disposed outside the fuel tank body 16, and an insulator disposed outside the heat insulating layer 20. And a three-layer structure.

  Further, as shown in FIG. 2, in the bottom wall 12 of the fuel tank 10, gaps 24 and 26 are formed between the fuel tank main body 16 and the heat insulating layer 20, and between the heat insulating layer 20 and the insulator 22, respectively. The fuel tank main body 16 is formed with a convex portion 28 so as to surround a hole forming region HA described later in a bottom view. The convex portion 28 is a convex portion having a triangular cross section in which the hole forming region HA side is a vertical wall surface and the opposite side is an inclined surface. Moreover, the height of the convex part 28 is larger than the width | variety of the clearance gap 24, and the clearance gap 24 is obstruct | occluded by arrange | positioning so that the front-end | tip may bite into the heat insulation layer 20. FIG.

  Similarly, a convex portion 30 is formed on the insulator 22 so as to surround the periphery of a hole forming region HA described later in a bottom view. The convex portion 30 is also a convex portion having a triangular cross section similar to the convex portion 28, and the height of the convex portion 30 is larger than the width of the gap 26, and the tip thereof is arranged to bite into the heat insulating layer 20, The gap 26 is closed.

  Further, as shown in FIG. 1, the insulator 22 is provided with a water draining hole 32 on the outer side (opposite to the hole forming area HA) than the convex part 30.

  On the insulator 22, a marker indicating the hole forming area HA is formed when the fuel tank 10 is drilled with a puncture tool 38, which will be described later, at the time of disassembly. Therefore, the user can drill at an appropriate position (hole forming area HA) in the fuel tank 10 by drilling with the puncture tool 38 at the position of the marker.

  On the other hand, as shown in FIG. 1, a fuel extraction device 34 for extracting gasoline 18 from the fuel tank 10 is disposed on a table 36 with casters and an upper portion of the table 36, and a drill blade is provided on the surface, and a drill is driven by a motor. A puncture tool 38 that is possible, a box-shaped fuel receiving portion 40 that is provided at the base portion of the puncture tool 38 and accommodates gasoline 18 flowing down from the hole, and the gasoline 18 once accommodated in the fuel receiving portion 40 is stored in the storage tank 42. A feeding tube 44.

  The operation of the fuel tank 10 thus configured will be described.

  When the gasoline 18 is extracted from the fuel tank 10 such as when the vehicle is dismantled, the fuel extraction device 34 is moved to the lower side of the fuel tank 10 provided at the lower portion of the vehicle, and the fuel tank 10 (insulator 22) is moved by the puncture tool 38. The bottom wall 12 of the fuel tank 10 is drilled by the puncture tool 38 at the position of the marker indicating the hole forming area HA provided on the bottom wall 12).

  As a result, as shown in FIG. 3, the puncture tool 38 passes through the insulator 22, the heat insulating layer 20, and the fuel tank main body 16, and the tip enters the closed space 14. As a result, the gasoline 18 is discharged from the gap between the hole 46 formed in the fuel tank 10 and the puncture tool 38 to the outside of the tank, and once stored in the fuel receiver 40, it is transferred to the storage tank 42 via the tube 44. Is done.

  At this time, part of the gasoline 18 that flows down from the closed space 14 through the gap between the hole 46 and the puncture tool 38 enters the gap 24 between the fuel tank body 16 and the heat insulation layer 20 and the gap 26 between the heat insulation layer 20 and the insulator 22. To do. However, the gap 24 is closed by forming the convex portion 28 that protrudes from the fuel tank main body 16 toward the heat insulating layer 20 so as to surround the hole forming area HA (hole 46) in the bottom view. The gasoline 18 that has entered the gap 24 cannot diffuse to the outside of the convex portion 28. That is, the gasoline 18 that has entered the gap 24 is blocked by the convex portion 28.

  Similarly, in the gasoline 18 that has entered the gap 26, the protrusions 30 that protrude from the insulator 22 to the heat insulating layer 20 so as to surround the hole formation area HA (hole 46) in the bottom view block the gap 26. Therefore, it cannot be diffused to the opposite side of the convex portion 30 and is dammed up.

  As a result, the gasoline 18 having entered the gap 26 is reliably prevented from entering the outside of the convex portion 30 and scattering from the drain hole 32 to the lower portion.

  Thus, in the fuel tank 10, the diffusion of the gasoline 18 in the gaps 24 and 26 can be suppressed when the gasoline 18 is extracted.

  In the present embodiment, the protrusions 28 and 30 are formed so as to protrude from the fuel tank body 16 and the insulator 22, respectively.

[Second Embodiment]
A fuel tank according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 and FIG. 5 are cross-sectional views showing the main parts of the fuel tank according to the present embodiment before and after the fuel is extracted. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Specifically, since only the points where the heat insulating layer 20 and the insulator 22 are provided with the concave portions in place of the convex portions 28 and 30 are different, only those portions will be described.

  As shown in FIG. 4, the heat insulating layer 20 of the fuel tank 50 includes a recess 52 that includes a hole forming area HA and has a diameter wider than the range of the hole forming area HA and is recessed downward in the direction of gravity. Yes.

  Further, as shown in FIG. 4, the insulator 22 of the fuel tank 50 has a convex portion 54 that includes a hole forming area HA, has a diameter wider than the hole forming area HA, and is bent outward. Yes. As a result, the insulator 22 is formed with a recessed portion 56 that is recessed in the downward direction of gravity in the same shape as the recessed portion 52 on the gap 26 side.

  The operation of the fuel tank 50 configured as described above will be described.

  As shown in FIG. 5, when the hole 46 is formed in the hole formation area HA of the fuel tank 50 by the puncture tool 38, a part of the gasoline 18 flowing out from the gap between the hole 46 and the puncture tool 38 is part of the gap 24. , 26. Since the gasoline 18 that has entered the gap 24 is accommodated in the recess 52, the gasoline 18 is prevented from diffusing inside the gap 24. Further, since the gasoline 18 that has entered the gap 26 is also temporarily stored in the recess 56, it is suppressed from diffusing into the gap 26.

  In this manner, in the fuel tank 50, the diffusion of the gasoline 18 in the gaps 24 and 26 can be suppressed or prevented when the gasoline 18 is extracted.

  In the present embodiment, the recesses 52 and 56 are formed in a range including the hole forming area HA in the bottom view, but may be formed only around the hole forming area HA.

[Third Embodiment]
A fuel tank according to a third embodiment of the present invention will be described with reference to FIGS. FIGS. 6 and 7 are cross-sectional views showing the main parts of the fuel tank according to the present embodiment before the fuel extraction operation and the fuel extraction operation, respectively. The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the fuel tank 60 according to the present embodiment is obtained by forming the concave portions 56 of the second embodiment on the one provided with the convex portions 28 and 30 of the first embodiment. As shown in FIG. 6, the concave portion 56 of the insulator 22 is formed inside the convex portion 30.

  The operation of the fuel tank 60 configured as described above will be described.

  As shown in FIG. 7, when the hole 46 is formed in the hole formation area HA of the fuel tank 60 by the puncture tool 38, a part of the gasoline 18 flowing out from the gap between the hole 46 and the puncture tool 38 is part of the gap 24. , 26.

  Here, since the gap 24 is closed around the hole forming area HA (hole 46) in the bottom view by the protruding portion 28 formed to protrude from the fuel tank main body 16 to the heat insulating layer 20 side, The gasoline 18 that has entered cannot diffuse to the outside of the convex portion 28. That is, the gasoline 18 that has entered the gap 24 is blocked by the convex portion 28.

  On the other hand, since the gasoline 18 that has entered the gap 26 is accommodated in the recess 56, it is suppressed from diffusing in the gap 26. Further, even if it overflows from the concave portion 56 and further enters the gap 26, it is blocked by the convex portion 30 that closes the gap 26.

  As described above, in the fuel tank 60, diffusion of the gasoline 18 from the gaps 24 and 26 can be suppressed when the gasoline 18 is extracted from the fuel tank 60. In particular, since the recess 56 is provided on the insulator 22 side, it is possible to reliably prevent the gasoline 18 from diffusing from the gap 26 and leaking from the drain hole 32.

[Fourth Embodiment]
A fuel tank according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view of the main part showing a state before the fuel is extracted from the fuel tank according to the present embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, the fuel tank 70 is formed by closing the gap 24 by connecting the fuel tank body 16 and the heat insulating layer 20 around the hole forming area HA in a bottom view with a double-sided tape 72. . Similarly, the gap 26 is closed by connecting the heat insulating layer 20 and the insulator 22 with a double-sided tape 74 around the hole forming area HA in the bottom view.

  The operation of the fuel tank 70 configured as described above will be described.

  When the hole 46 is formed in the hole forming area HA of the fuel tank 70 by the puncture tool 38, a part of the gasoline 18 flowing out from the gap between the hole 46 and the puncture tool 38 enters the gaps 24 and 26. The gasoline 18 that has entered the gaps 24 and 26 is blocked by double-sided tapes 72 and 74 that close the gaps 24 and 26.

  Therefore, in the fuel tank 70, the diffusion of the gasoline 18 from the gaps 24 and 26 can be suppressed or prevented when the gasoline 18 is extracted from the fuel tank 70. Further, the weir portion of the present invention can be easily formed without changing the conventional shapes of the constituent members such as the fuel tank main body 16, the heat insulating layer 20, and the insulator 22.

  In this embodiment, a double-sided tape is used, but other adhesives may be used as long as the gaps 24 and 26 can be closed.

[Fifth Embodiment]
A fuel tank according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view of the main part showing a state before the fuel is extracted from the fuel tank according to the present embodiment. The same components as those in the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, in the fuel tank 80, circular patches 82 and 84 having a diameter larger than the diameter of the hole forming area HA are arranged in the gaps 24 and 26 in the area including the hole forming area HA in the bottom view. It is a thing.

  The operation of the fuel tank 80 configured as described above will be described.

  When the hole 46 is formed in the hole forming area HA of the fuel tank 70 by the puncture tool 38, the hole 46 passes through the central portions of the patches 82 and 84. As a result, the portions facing the hole 46 in the gaps 24 and 26 are blocked by the patches 82 and 84. Therefore, the patches 82 and 84 prevent a part of the gasoline 18 flowing out from the gap between the hole 46 and the puncture tool 38 from entering the gaps 24 and 26.

  That is, the fuel tank 80 can prevent the gasoline 18 from diffusing in the gaps 24 and 26 when the gasoline 18 is extracted.

  In the series of embodiments, the projections 28 and 30, the recesses 52 and 56 and the double-sided tapes 72 and 74 are shown, but at least one of these or any combination thereof is also included in the present invention. For example, a fuel tank or the like in which all of the convex portions 28 and 30 and the concave portions 52 and 56 are combined.

  Further, in the fuel tank of the series of embodiments, the fuel tank having the three-layer structure of the fuel tank body 16, the heat insulating layer 20, and the insulator 22 has been described. However, the present invention can be applied to any fuel tank having a plurality of layers. is there.

  Furthermore, in the fuel tank according to the series of embodiments, the protrusions 28 and 30 and the patches 82 and 84 completely close the gaps 24 and 26. However, the gaps 24 and 26 may be narrowed.

10, 50, 60, 70 80 Fuel tank 12 Bottom wall 16 Fuel tank body 18 Gasoline (fuel)
20 Thermal insulation layer (outer layer)
22 Insulator (outer layer)
24, 26 Clearance 28, 30 Convex part (weir part)
52, 56 Recess (weir)
72, 74 Double-sided tape (weir, adhesive)
82, 84 patch (gap closing member)

Claims (5)

A plurality of layers made of different materials constituting the bottom wall of the fuel tank;
A dam provided in at least one gap between the adjacent layers, at least around the hole forming region for fuel removal in a bottom view;
With fuel tank.   2. The fuel tank according to claim 1, wherein the dam portion is a convex portion formed to protrude from at least one of the layers constituting the gap toward the other layer.   3. The fuel tank according to claim 1, wherein the weir portion is a concave portion provided in the layer and recessed in a downward direction of gravity.   The fuel tank according to claim 1, wherein the dam portion is an adhesive that closes the gap. A plurality of layers made of different materials constituting the bottom wall of the fuel tank;
A gap closing member provided in a region including a hole forming region for fuel removal in a bottom view in at least one of the gaps between the adjacent layers;
With fuel tank.

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