JP2004090700A - Sub tank of fuel tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sub tank of a resin fuel tank. <P>SOLUTION: The sub tank of the fuel tank comprises substantially cylindrical tank ribs protruded upwardly from a bottom surface of a lower tank, and spill preventive walls protruded downwardly from a surface of an upper tank facing the tank ribs and overlapping at least a part of the tank ribs while being separated from the tank ribs in the peripheral direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-tank of a fuel tank disposed inside a fuel tank made of resin, and more particularly to a fuel tank in which fuel in the sub-tank is prevented from spilling when the vehicle body is tilted. The present invention relates to a fuel tank sub-tank that does not interfere and prevents excessive deformation of the fuel tank even when an excessive external force is applied to the fuel tank.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, fuel tanks for automobiles have been formed of various materials such as metals and resins. Among them, a fuel tank formed of a resin material has reinforcing ribs of various shapes provided therein for the purpose of improving strength. Also, by forming these reinforcing ribs in various shapes, various functions are added. As a reinforcing rib to which such a function is added, for example, there is a resin fuel sub-tank disclosed in Japanese Patent Application Laid-Open No. H11-254978.
[0003]
A resin fuel sub-tank (hereinafter, referred to as a sub-tank) disclosed in Japanese Patent Application Laid-Open No. H11-2554978 has a substantially cylindrical shape provided in a fuel tank, and an engine is provided in the sub-tank. A fuel pump for supplying fuel to the fuel cell is provided. In this sub-tank, fuel is retained even when the vehicle body leans when the fuel remaining amount in the fuel tank is low, so the fuel pump in the sub-tank also ensures that the fuel in the tank is It becomes possible to supply.
[0004]
Various shapes have been devised for such a fuel tank sub-tank in order to properly hold the fuel inside the vehicle when the vehicle is tilted. For example, in U.S. Pat. No. 4,526,286, opposed portions of an upper tank wall and a lower tank wall of a fuel tank are protruded into the tank, and each protruding portion is brought into contact at a contact point by a method such as welding to form an internal space. It is disclosed that a sub-tank is constituted by this internal space. According to this sub-tank, since each protruding portion serves as a liquid leakage prevention wall that shuts off the sub-tank and the fuel tank, the fuel is prevented from leaking from the inside of the sub-tank even when the vehicle body is tilted or when sudden braking is performed.
[0005]
Here, the resin fuel tank is usually integrally formed by blow molding. However, when the fuel tank is integrally formed by blow molding, its internal shape is naturally limited, and it has been extremely difficult to form reinforcing ribs of various shapes at desired positions, for example. Further, since a molded product obtained by blow molding is relatively thick, a lightweight fuel tank formed to be thin is desired also from the viewpoint of improving fuel efficiency of a vehicle. Therefore, for example, the upper tank and the lower tank are separately formed by a method such as injection molding or press molding, and the upper tank and the lower tank are air-tightly integrated to form a fuel tank, so that various internal structures can be favorably formed. Thin fuel tanks have been devised.
[0006]
However, when the upper tank and the lower tank are separately formed by injection molding or the like, if the liquid leakage prevention wall having the shape described in US Pat. No. 4,526,286 is separately provided in the upper tank and the lower tank, the opposite liquid leakage prevention is provided. The walls may interfere with each other when assembling the upper tank and the lower tank and may not be properly integrated, and may require extremely high precision in molding. In addition, when the liquid leakage prevention walls interfere with each other, the respective liquid leakage prevention walls are damaged when they are integrated, or stress is concentrated on the fuel tank main body in contact with the liquid leakage prevention walls.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has as its object to provide a sub tank of a resin fuel tank.
[0008]
[Means for Solving the Problems]
A fuel tank according to the present invention for solving the above-mentioned problems is provided inside a resin fuel tank in which an upper tank and a lower tank are airtightly integrated, and at least one of reinforcing ribs formed integrally with the upper tank or the lower tank. A sub-tank of a fuel tank comprising: a substantially cylindrical tank rib protruding upward from a bottom surface of the lower tank; and a sub-tank protruding downward from a surface of the upper tank opposed to the tank rib. The tank ribs are provided with an overwrap spill-prevention wall on at least a part of the tank rib while being separated in the direction.
[0009]
According to this configuration, since the tank rib and the spill prevention wall are arranged while being spaced apart in the circumferential direction, the tank rib and the spill prevention wall do not interfere with each other, and the upper tank and the lower tank can be favorably integrated with each other. Thus, stress concentration on the tank rib, the spill prevention wall and the fuel tank main body due to the interference is avoided.
[0010]
Further, since the spill prevention wall overlaps at least a part of the tank rib, the tank rib and the spill prevention wall do not have a gap in the axial direction even though the tank rib and the spill prevention wall are not in contact with each other. With this configuration, the fuel is prevented from leaking from the gap between the tank rib and the spill prevention wall even at the time of incline, sudden braking, or the like.
[0011]
Preferably, the spill prevention wall overlaps at least a part of the tank rib on an inner circumferential side in a circumferential direction.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The sub-tank of the fuel tank according to the present invention is disposed inside a resin fuel tank in which the upper tank and the lower tank are hermetically integrated, and includes at least a part of a reinforcing rib integrally formed on the upper tank or the lower tank. This is a sub-tank of the configured fuel tank.
[0013]
As described above, the resin fuel tank is usually formed integrally by blow molding, but the fuel tank of the present invention is formed by integrating the upper tank and the lower tank formed by injection molding or the like. It forms a tank. With the fuel tank having such a configuration, it is possible to easily form reinforcing ribs of various shapes inside the fuel tank.
[0014]
The fuel tank holds the fuel therein, and since the fuel is easily volatilized, the upper tank and the lower tank need to be hermetically integrated. In order to airtightly integrate the upper tank and the lower tank, for example, a method is used in which a flange is provided at the joint between the upper tank and the lower tank, the joint is widened, and then integrated by known means. . As the known integrating means, for example, welding, bonding, screwing with a bolt, and the like can be mentioned. When the upper tank and the lower tank are integrated by screwing with bolts, it is necessary to further arrange a sealing material such as an O-ring in a gap between the upper tank and the lower tank in order to secure airtightness.
[0015]
In the fuel tank sub-tank of the present invention, the upper tank or the lower tank is integrally formed with a reinforcing rib. At least a part of the reinforcing rib constitutes a sub tank of the fuel tank. In the present invention, the fuel tank is made of resin, and therefore has a lower rigidity than a metal fuel tank. Therefore, reinforcing ribs are provided in the fuel tank to improve the rigidity of the fuel tank. The reinforcing rib can be provided in a portion of the fuel tank to which external force is applied, a portion where stress is concentrated, or the like, and can be provided in the upper tank or the lower tank.
[0016]
In the fuel tank of the present invention, the sub tank has a substantially cylindrical tank rib projecting upward from the bottom surface of the lower tank.
[0017]
As described above, the sub-tank holds the fuel well even when the vehicle body is tilted when the remaining fuel amount in the fuel tank is low, and the fuel pump in the fuel tank also provided in the sub-tank supplies the fuel in the tank. It is a reliable supply. The sub-tank is formed inside the fuel tank, and has a structure in which the fuel tank and the inside of the sub-tank are partially connected by an oil passage. The fuel in the fuel tank flows into the sub-tank through the oil passage, and the fuel is held in the sub-tank. However, the fuel tank and the sub-tank are separated by the wall surface of the sub-tank. For this reason, when the fuel level of the fuel in the fuel tank is different when the fuel tank is tilted, the water level of the fuel held in the sub-tank is maintained even when the fuel level in the fuel tank becomes very low. Is similar to the water level. Therefore, even when the vehicle is tilted, the supply of the fuel to the fuel pump disposed in the sub tank is performed well.
[0018]
The shape of such a sub-tank can take various cylindrical shapes such as a substantially prismatic shape, a substantially cylindrical shape, and a substantially spiral pillar shape. In any case, the sub-tank is integrated with the lower tank at least at the bottom thereof. Thus, a portion integrated with the lower tank becomes a tank rib. Further, in the fuel tank sub-tank of the present invention, the sub-tank is constituted by a tank rib and a spill-prevention wall described later. Therefore, the tank rib, which is the lower tank side portion of the sub tank, protrudes upward from the bottom surface of the lower tank, and the upper end is opened to form an open end.
[0019]
In the fuel tank sub-tank of the present invention, the upper tank is provided with a spill prevention wall. The spill prevention wall has a shape that protrudes downward from a surface of the upper tank facing the tank rib and overlaps at least a part of the tank rib while being spaced apart from the tank rib in the circumferential direction.
[0020]
In the fuel tank sub-tank of the present invention, since the tank rib is overlapped by the spill prevention wall, the opening end of the tank rib is surrounded by the spill prevention wall, so that the sub tank and the fuel tank are more reliably connected. As a result, the fuel is prevented from leaking to the outside of the sub-tank from the opening end even when the fuel tank is inclined.
[0021]
Further, the spill prevention wall does not necessarily have to overlap the entire circumference of the tank rib. For example, when the sub-tank is provided at the end of the fuel tank and the sub-tank and the wall surface of the fuel tank are close to each other, the wall surface of the fuel tank may exhibit the same effect as the spill prevention wall. . In this case, it is possible to overlap only the portion of the tank rib except for this portion with the spill prevention wall.
[0022]
The shape of the spill prevention wall can be formed in a shape corresponding to the shape of the tank rib. For example, when the shape of the sub-tank is substantially cylindrical, the shape of the tank rib, which is a part of the sub-tank integrated with the lower tank, is also substantially cylindrical. In this case, the shape of the spill prevention wall is a shape in which a substantially cylindrical tank rib is overlapped on the inner circumferential side or the outer circumferential side in order to overlap the tank rib while being spaced apart from the tank rib in the circumferential direction, that is, slightly larger than the tank rib. It is formed in a substantially cylindrical shape that is substantially similar to the shape of the tank rib having a slightly smaller diameter.
[0023]
Further, for example, when the shape of the sub tank is substantially a spiral column, the shape of the tank rib is also substantially a spiral column, and the shape of the spill prevention wall is substantially similar to the tank rib having a diameter slightly larger or slightly smaller than the tank rib. It will be formed in a columnar shape. By arranging the spill prevention wall in the circumferential direction apart from the tank rib, interference between the spill prevention wall and the tank rib is avoided, and damage during production of the fuel tank is suppressed. Further, since the spill prevention wall and the tank rib do not abut, the precision required for molding is relatively low. Further, since the positioning of the upper tank and the lower tank when they are integrated can be performed by the spill prevention wall and the tank rib, the manufacturing process of the fuel tank is simplified.
[0024]
Here, the higher the height of the spill prevention wall is, the larger the portion overlapping the tank rib is, and a better spill prevention effect is exhibited. The higher the height of the tank rib, the better the spill prevention effect. On the other hand, for example, when an external force in the height direction is applied to the fuel tank, as the height of the tank rib or the height of the spill prevention wall is larger, the deformation in the height direction of the fuel tank is interfered by the tank rib or the spill prevention wall. . In this case, if the external force applied to the fuel tank in the height direction becomes excessive, stress may concentrate on a specific portion of the fuel tank due to the interference, and the fuel tank may be damaged. Therefore, the height of the tank rib and the height of the spill prevention wall are appropriately set in consideration of the external force applied to the fuel tank.
[0025]
In the fuel tank sub-tank of the present invention, the spill prevention wall preferably overlaps at least a part of the tank rib on the inner circumferential side in the circumferential direction. When the spill prevention wall overlaps on the inner circumferential side of the tank rib, even when the fuel level in the sub tank is higher than the height of the tank rib, leakage of fuel from the gap between the tank rib and the spill prevention wall is more reliable. Is suppressed.
[0026]
Further, the spill prevention wall is not limited to being disposed only on the outer peripheral side or the inner peripheral side in the circumferential direction of the tank rib, but may be disposed on both the outer peripheral side and the inner peripheral side. In this case, the tank rib is overlapped by the spill prevention wall at two locations on the inner peripheral side and the outer peripheral side, and leakage of the fuel from the sub tank is further suppressed.
[0027]
Further, a break start portion may be provided at a predetermined position of the opening end of the tank rib. The break start portion is a portion provided at least at the opening end of the tank rib, and is formed in a shape that is easier to break than other portions of the tank rib. This break start portion may be formed by cutting out a part of the tank rib from the predetermined position of the opening end toward the bottom surface of the lower tank, or a portion that is partially thinner from the predetermined position of the opening end toward the bottom surface of the lower tank. Can be formed, and the present invention is not limited to this, and various known methods can be used.
[0028]
As described above, increasing the height of the tank rib can further prevent the fuel from leaking from the inside of the sub tank, but on the other hand, when an external force is applied in the height direction of the fuel tank, Deformation may be hindered. By providing a break start portion at a predetermined position of the opening end of the tank rib, a large external force acts on the fuel tank, and when the fuel tank itself deforms, the break start portion of the tank rib breaks at the same time. Therefore, the interference of the tank ribs with the deformation of the fuel tank is avoided, and the concentration of stress on a specific portion is suppressed.
[0029]
Here, the predetermined position of the open end refers to a predetermined position where the tank rib is likely to break. For example, when the shape of the tank rib is a substantially prismatic shape, it is preferable to set this corner portion to a predetermined position. When the shape of the tank rib is a substantially cylindrical shape, a plurality of positions selected at equal intervals or randomly are set to the predetermined positions. It is preferable that In any case, it is preferable that this predetermined position is provided in many cases in order to facilitate the breaking of the tank rib, and in order to facilitate the formation of the tank rib and to keep the shape of the sub-tank in a normal use condition, it is small. Preferably, it is provided. Further, in order to suppress the leakage of fuel from the inside of the sub tank, it is preferable that the predetermined position is provided in a small number. Further, in this case, when the break start portion is formed by notching, the break start portion needs to be provided in a portion which is overlapped by the spill prevention wall, and is preferably provided in a short and small shape. Therefore, the predetermined position can be appropriately set according to the rigidity of the material forming the fuel tank, the shape of the sub tank or the fuel tank, or the shape of the spill prevention wall.
[0030]
Further, a break guide portion can be provided on the surface of the upper tank facing the break start portion. The fracture guide portion has a structure for breaking the tank rib from the fracture start portion when an external force in the height direction is applied to the fuel tank. The break guide portion is formed in a shape corresponding to the shape of the break start portion, and is formed in a shape capable of guiding the tank rib broken from the break start portion to a position not interfering with the upper tank. For this reason, when the external force becomes large and the tank rib is pressed against the upper tank, the break start portion is pressed by the break guide portion and the break starts. Further, when the external force becomes excessive, the rupture starting from the rupture start portion proceeds, and the sub-tank is ruptured while being guided by the rupture guide so as not to interfere with the upper tank.
[0031]
With this configuration, the fuel tank is formed of a resin material having a relatively high elasticity, the fuel tank itself has a structure that can be easily deformed, and even when the height of the tank rib is formed high, the height of the fuel tank is reduced. This prevents the tank rib from obstructing the directional deformation. Therefore, the deformation of the fuel tank becomes favorable.
[0032]
Here, in order to prevent interference between the fractured portions, it is preferable that the guidance by the fracture guide portion is performed toward the outside of the sub tank. In addition, in order to induce the fracture toward the outside of the sub-tank, it is desirable that the fracture guide portion is inserted into the inside of the sub-tank at the time of deformation.
[0033]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0034]
(Example 1)
The tab tank of the fuel tank of the first embodiment is an example in which the sub-tank has a substantially prismatic shape, and the spill prevention wall overlaps the inner circumferential side of the tank rib in the circumferential direction. FIG. 1 is a schematic cross-sectional view of a fuel tank having a sub tank according to the first embodiment.
[0035]
The sub tank 1 according to the first embodiment is disposed inside a fuel tank 2. The fuel tank 2 includes an upper tank 3 and a lower tank 4. The upper tank 3 is a member made of resin and formed into a hollow box shape by injection molding, and a flat upper flange portion 6 is provided on the outer peripheral edge of the opening 5 of the upper tank 3. The lower tank 4 is a member made of the same material as the upper tank 3 and formed by the same injection molding as the upper tank 3. A flat lower flange portion 8 corresponding to the upper flange portion 6 is provided on the outer peripheral edge of the opening 7 of the lower tank 4. Is formed. After the upper tank 3 and the lower tank 4 are separately formed, the upper flange portion 6 and the lower flange portion 8 are welded and integrated.
[0036]
A tank rib 10 is formed on the bottom surface 9 of the lower tank 4. The tank rib 10 has a substantially prismatic shape extending above the bottom surface 9 of the lower tank 4, and an upper end side is open to form an open end 11. A fuel pump (not shown) is accommodated in a space inside the tank rib 10. The tank rib 10 partially communicates with the fuel tank 2 via an oil passage (not shown), and the fuel in the fuel tank 2 flows into the tank rib 10 via the oil passage.
[0037]
In the upper tank 3, at a position facing the tank rib 10, a spill prevention wall 12 having a shape protruding downward from the surface of the upper tank 3 is formed. The spill prevention wall 12 is arranged while being spaced apart from the tank rib 10 in the circumferential direction, and overlaps the entire inner periphery of the tank rib 10 in the circumferential direction. The sub-tank 1 of the fuel tank 2 according to the first embodiment of the present invention is constituted by the tank rib 10 and the spill prevention wall 12.
[0038]
In the sub-tank 1 of the fuel tank 2 of the first embodiment, the tank rib 10 is overlapped by a spill prevention wall 12 over the entire circumference. Therefore, even when the fuel level in the sub tank 1 exceeds the tank rib 10 such as when the vehicle is tilted or when the vehicle is suddenly braked, the leakage of the fuel from the sub tank 1 is suppressed by the spill prevention wall 12.
[0039]
Since the tank rib 10 and the spill prevention wall 12 are arranged while being separated from each other, it is possible to prevent the tank rib 10 and the spill prevention wall 12 from interfering with each other during manufacturing.
[0040]
(Example 2)
The tab tank of the fuel tank according to the second embodiment has a sub-tank formed on the end side of the fuel tank, the sub-tank and the wall surface of the fuel tank are close to each other, and the spill prevention wall is formed in a portion except for the close-contact portion. Other than that, it was formed in the same manner as in Example 1. FIG. 2 is a schematic cross-sectional view of a fuel tank having a sub tank according to the second embodiment.
[0041]
The fuel tank 14 having the sub tank 13 of the second embodiment has an upper flange portion 15 and a lower flange portion 16 having the same shape as the first embodiment, and the upper flange portion 15 and the lower flange portion 16 are the same as those of the first embodiment. , The upper tank 17 and the lower tank 18 are integrated.
[0042]
In the second embodiment, the tank rib 19 is formed on the end side of the lower tank 18 in close proximity to the wall surface 20 of the fuel tank 14 and has the same shape as that of the first embodiment. The spill prevention wall 21 is formed in the upper tank 17 at a position facing the tank rib 19. The spill prevention wall 21 is arranged while being spaced apart from the tank rib 19 in the circumferential direction, and overlaps with a portion of the tank rib 19 other than a portion close to the lower tank 18 on the inner circumferential side in the circumferential direction.
[0043]
In the sub-tank 13 of the fuel tank 14 according to the second embodiment, the tank rib 19 and the wall surface 20 of the fuel tank 14 are formed close to each other. Therefore, even when the fuel level in the sub-tank 13 exceeds the tank rib 19 when the vehicle is tilted or when the vehicle is suddenly braked, the sub-tank 13 from the portion of the sub-tank 13 on the side close to the wall surface 20 of the fuel tank 14 may be used. The outflow of fuel is suppressed by the wall surface 20 of the fuel tank 14. Further, since the portion of the sub-tank 13 that is not close to the wall surface 20 of the fuel tank 14 is overlapped by the spill-prevention wall 21, the outflow of the fuel from the sub-tank 13 in the overlapped portion is spilled. This is suppressed by the prevention wall 21.
[0044]
(Example 3)
The tab tank of the fuel tank according to the third embodiment is the same as the fuel tank of the third embodiment except that a break start portion is provided at the opening end of the tank rib, and a break guide portion is provided on the surface of the upper tank facing the break start portion. This is formed in the same manner as 1. FIG. 3 is a schematic cross-sectional view of the fuel tank having the sub-tank of the third embodiment, and FIG. 4 is a schematic cross-sectional view of the fuel tank having the sub-tank of the third embodiment when an external force is applied.
[0045]
In the sub-tank 23 of the fuel tank 22 of the third embodiment, the open end portions 25 of the substantially prismatic corners of the tank rib 24 are each formed to be thin and constitute a fracture start portion 26. In the upper tank 27, a fracture guide portion 28 is formed on a surface of the tank rib 24 facing the fracture start portion 26. The fracture guide portion 28 has a shape in which a substantially quadrangular pyramid that protrudes in the direction of the fracture start portion 26 and is opened while the upper tank 27 side is curved more than the lower tank 29 side is cut by a plane parallel to the bottom surface. The break guide portion 28 is disposed on the outer peripheral side of the spill prevention wall 30 in the circumferential direction.
[0046]
In the sub-tank 23 of the fuel tank 22 of the third embodiment, when an external force acts from the bottom 31 of the lower tank 29 toward the upper tank 27, the lower tank 29 is pressed toward the upper tank 27 and deformed. At this time, the tank rib 24 in the lower tank 29 is pressed toward the upper tank 27. Therefore, the break guide portion 28 formed in the upper tank 27 is inserted into the tank rib 24, and the break start portion 26 of the tank rib 24 comes into contact with the break guide portion 28. Since the upper tank 27 side of the break guide portion 28 has a shape that is more open than the lower tank 29 side, when the external force becomes excessive and insertion of the break guide portion 28 into the sub-tank 23 proceeds, as shown in FIG. The opening end side 25 of the tank rib 24 is forcibly opened, and the tank rib 24 is broken from the break start portion 26. On the other hand, since the guide surface 32 of the break guide portion 28 also has a curved shape in which the upper tank 27 side is opened more than the lower tank 29 side, the side surface of the tank rib 24 has a shape corresponding to the curved shape of the guide surface 32. It is regulated and guided to a position that does not interfere with the upper tank 27. Since the breaking and the guide are performed at the same time, the tank rib 24 breaks while being guided so as not to interfere with the upper tank 27. Therefore, even when an excessive external force acts on the fuel tank 22 and the fuel tank 22 is deformed, the tank ribs 24 are prevented from interfering with the deformation of the upper tank 27 and the lower tank 29, and the sub-tank 23 is connected to the outer shell of the upper tank 27. Is prevented from being applied to the upper tank 27 and the lower tank 29.
[0047]
Further, since the sub-tank 23 of the fuel tank 22 of the third embodiment has the tank rib 24 overlapped by the spill prevention wall 30 as in the first embodiment, leakage of fuel from the inside of the sub-tank 23 is suppressed. Furthermore, since the tank rib 24 and the spill prevention wall 30 are arranged apart from each other, it is possible to prevent the tank rib 24 and the spill prevention wall 30 from interfering with each other.
[0048]
【The invention's effect】
As described above, according to the fuel tank sub-tank of the present invention, since the tank rib is overlapped by the spill prevention wall, the fuel level in the sub-tank when the vehicle is tilted or when the vehicle is suddenly braked is reduced. Even in the case where the height exceeds the height, the leakage of fuel from inside the sub tank is suppressed.
[0049]
Further, since the tank rib formed on the lower tank and the spill prevention wall formed on the upper tank are arranged while being spaced apart in the circumferential direction, even when the upper tank and the lower tank are assembled and integrated, the tank rib and Contact with the upper tank is avoided, and damage to the fuel tank during manufacturing is suppressed. Further, since the tank rib and the spill prevention wall do not contact each other, the formation of the tank rib and the spill prevention wall does not require very high precision. Therefore, the fuel tank can be easily formed, and the man-hour and cost required for manufacturing can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a fuel tank having a sub tank according to a first embodiment of the present invention.
FIG. 2 is a schematic sectional view of a fuel tank having a sub tank according to a second embodiment of the present invention.
FIG. 3 is a schematic sectional view of a fuel tank having a sub tank according to a third embodiment of the present invention.
FIG. 4 is a schematic sectional view of a fuel tank having a sub-tank according to a third embodiment of the present invention when an external force acts.
[Explanation of symbols]
1: Sub tank 2: Fuel tank 3: Upper tank 4: Lower tank 6: Upper flange 8: Lower flange 10: Tank rib 11: Open end 12: Spill prevention wall 13: Sub tank 14: Fuel tank 15: Upper flange 16: Lower flange Part 17: Upper tank 18: Lower tank 19: Tank rib 21: Spill prevention wall 22: Fuel tank 23: Sub tank 24: Tank rib 25: Open end 26: Break start part 27: Upper tank 28: Break guide part 29: Lower tank 30: Spill prevention wall

Claims (2)

A fuel tank sub-tank, which is disposed inside a resin fuel tank in which an upper tank and a lower tank are air-tightly integrated, and includes at least a part of a reinforcing rib formed integrally with the upper tank or the lower tank. ,
The sub-tank has a substantially cylindrical tank rib projecting upward from a bottom surface of the lower tank, and an at least part of the tank rib projecting downward from a surface of the upper tank facing the tank rib and being circumferentially separated from the tank rib. A fuel tank sub-tank comprising a burlap spill-prevention wall; The fuel tank sub-tank according to claim 1, wherein the spill prevention wall overlaps at least a part of the tank rib on an inner circumferential side in a circumferential direction.

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