Tank and method of manufacturing tank

Abstract

SOLUTION: A tank 10 includes: a liner 12; a nozzle 14 having a cylindrical boss portion 26 that communicates with the inside and outside of the liner and a flange portion 28 that protrudes from the boss portion toward a radial direction of the boss portion; and a coating layer 16 including a wound member 30 wound multiple times around a winding target that includes the liner and the flange portion, wherein a reinforcing piece 32 that is separate from the winding member and overlaps the winding member is provided at a portion of the covering layer that covers the flange portion, and a direction of fiber contained in a fiber-reinforced resin constituting the reinforcing piece and a direction of fiber contained in the fiber-reinforced resin constituting a part in contact with the reinforcing piece in the winding member cross each other.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a tank and a method for manufacturing a tank. [Background technology]

[0002] The following Patent Document 1 discloses a tank for storing high-pressure hydrogen gas. The tank has a liner, which has a cylindrical body and a dome-shaped side end. A nozzle is attached to each end of the liner. The outer surfaces of the liner and the nozzle are covered with a coating layer made of fiber-reinforced resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6549514 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology disclosed in the above Patent Document 1, a sheet made of fiber-reinforced resin is wound around a liner. A plurality of notches are provided at the end of the sheet that is wound around the liner to form a cylindrical shape, forming small pieces. The side ends of the liner are covered with these small pieces. However, a tank that can better cover the liner with a covering layer and a method for manufacturing the tank are desired.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] A first aspect of the present invention is a tank comprising: a liner; a nozzle having a cylindrical boss portion communicating between the inside and outside of the liner and a flange portion protruding from the boss portion in the radial direction of the boss portion; and a coating layer including a winding member wound multiple times around a winding object including the liner and the flange portion, wherein a portion of the coating layer covering the flange portion is provided with a reinforcing piece that is separate from the winding member and is superimposed on the winding member, and the direction of fibers contained in the fiber reinforced resin constituting the reinforcing piece and the direction of fibers contained in the fiber reinforced resin constituting the portion of the winding member that contacts the reinforcing piece intersect with each other.

[0007] A second aspect of the present invention is a method for manufacturing a tank comprising a liner, a nozzle having a cylindrical boss portion communicating between the inside and outside of the liner and a flange portion protruding from the boss portion in the radial direction of the boss portion, and a coating layer including a wound member wound multiple times around a winding object including the liner and the flange portion, the manufacturing method comprising a winding step of winding the winding member around the winding object, and a reinforcing step of overlapping a reinforcing piece separate from the wound member onto the wound member at a portion of the coating layer covering the flange portion, wherein the direction of fibers contained in the fiber reinforced resin constituting the reinforcing piece and the direction of fibers contained in the fiber reinforced resin constituting the portion of the winding member that contacts the reinforcing piece intersect with each other. Effect of the Invention

[0008] The present invention allows for better coverage of the liner with the coating layer. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view of the tank. [Diagram 2] FIG. 2 is a diagram illustrating a method for winding the winding member. [Diagram 3] FIG. 3 is a conceptual diagram of the process of overlapping the reinforcing piece onto the wound member. [Figure 4]FIG. 4 is a conceptual diagram of the process of overlapping the reinforcing piece on the wound member. [Diagram 5] FIG. 5 is a conceptual diagram of the process of overlapping the reinforcing piece on the wound member. [Figure 6] FIG. 6 is a cross-sectional view of the vicinity of the nozzle of the tank. [Figure 7] FIG. 7 is a conceptual diagram of the process of overlapping the reinforcing piece on the wound member. [Figure 8] Fig. 8A is a diagram showing a reinforcing piece, and Fig. 8B is a diagram showing a group of reinforcing pieces. [Figure 9] FIG. 9 is a conceptual diagram of the process of overlapping the reinforcing piece on the wound member. [Figure 10] Fig. 10A is a diagram showing a reinforcing piece, Fig. 10B is a diagram showing a reinforcing piece, and Fig. 10C is a diagram showing a group of reinforcing pieces. [Figure 11] FIG. 11 is a cross-sectional view of the vicinity of the nozzle of the tank. [Figure 12] Fig. 12A is a diagram showing a reinforcing piece constituting the cushion member, and Fig. 12B is a diagram showing a reinforcing piece constituting the cushion member. [Figure 13] Fig. 13A is a diagram showing a reinforcing piece constituting the cushion member, and Fig. 13B is a diagram showing a reinforcing piece constituting the cushion member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tank and a method for manufacturing a tank according to the present invention will be described below with reference to preferred embodiments and the accompanying drawings.

[0011] [First embodiment] [Tank configuration] 1 is a cross-sectional view of a tank 10. The tank 10 is, for example, a hydrogen gas tank mounted on a fuel cell vehicle and storing hydrogen gas to be used as fuel gas in the fuel cell vehicle. The gas stored in the tank 10 is not limited to hydrogen gas, and may be natural gas or the like. The tank 10 is not limited to a tank mounted on a fuel cell vehicle that uses gas as fuel, and may be a tank mounted on a vehicle that transports gas, or a tank installed in ground equipment that stores gas.

[0012] The tank 10 comprises a liner 12 filled with high-pressure gas, a pair of nozzles 14 attached to both ends of the liner 12, and a coating layer 16 covering the outer circumferential surface of the liner 12.

[0013] The liner 12 is formed from, for example, polyamide, high-density polyethylene, or the like, which has a relatively high hydrogen gas barrier property. The liner 12 has a cylinder portion 18, a pair of dome portions 20 formed on both ends of the cylinder portion 18, and an attachment portion 22 to which the nozzle 14 is attached. An opening 24 is formed in the attachment portion 22.

[0014] The nozzle 14 has a cylindrical boss portion 26 and a flange portion 28 protruding from the boss portion 26 in the radial direction of the boss portion 26. The boss portion 26 is connected to an opening 24 of the liner 12, and communicates between the inside and the outside of the liner 12.

[0015] The coating layer 16 covers the outer surface of the cylinder portion 18 , the outer surface of the dome portion 20 , and the outer surface of the flange portion 28 .

[0016] The liner 12 is attached to a filament winding device (not shown) so as to be rotatable about the axis A. The filament winding device is a device for winding a winding member 30 (see FIG. 2) made of a strip-shaped fiber-reinforced resin around the liner 12. The fiber-reinforced resin is a tape-shaped fiber bundle in which the fibers are impregnated with resin. For example, carbon fiber, glass fiber, etc. are used as the fibers. For the resin, epoxy, polyester, etc., which are thermosetting resins, are used. The direction of the fibers contained in the fiber-reinforced resin constituting the winding member 30 is along the longitudinal direction of the winding member 30. Hereinafter, the direction of the fibers contained in the fiber-reinforced resin constituting the winding member 30 may be simply referred to as the direction of the fibers of the winding member 30. The fiber-reinforced resin is laminated by winding the winding member 30 around the liner 12, and the coating layer 16 is formed. The coating layer 16 is pressurized and heated together with the liner 12 to harden.

[0017] [About winding the winding components] FIG. 2 is a diagram for explaining a winding method of the winding member 30. There are hoop winding and helical winding as winding methods of the winding member 30. The winding method of the winding member 30a in FIG. 2 is hoop winding. In a side view of the liner 12, an angle between the axis A and the longitudinal direction of the winding member 30a is approximately 90 degrees. The winding method of the winding members 30b and 30c in FIG. 2 is helical winding. The winding member 30b does not pass over the flange portion 28 of the nozzle 14. On the other hand, the winding member 30c passes over the flange portion 28. In a side view of the liner 12, an angle B between the axis A and the longitudinal direction of the winding member 30b is smaller than 90 degrees. In a side view of the liner 12, an angle C formed between the axis A and the longitudinal direction of the winding member 30c is smaller than an angle B formed between the axis A and the longitudinal direction of the winding member 30b. Hereinafter, the angle formed between the axis A and the longitudinal direction of the winding member 30 may be simply referred to as the angle of the winding member 30.

[0018] The cylinder portion 18 is reinforced by a hoop layer formed of the wound member 30 wound by hoop winding in the covering layer 16. The dome portion 20 and the flange portion 28 are reinforced by a helical layer formed of the wound member 30 wound by helical winding in the covering layer 16. The wound member 30 wound by helical winding around the dome portion 20 and the flange portion 28 is also wound by helical winding around the cylinder portion 18. Therefore, the covering layer 16 covering the cylinder portion 18 includes a hoop layer and a helical layer. However, the helical layer covering the cylinder portion 18 makes almost no contribution to the reinforcement of the cylinder portion 18.

[0019] High stress is applied to the base of the flange portion 28 of the base 14. For this reason, it is conceivable to increase the number of turns of the winding member 30 that passes over the flange portion 28 compared to the number of turns of the winding member 30 that does not pass over the flange portion 28, thereby increasing the strength of the coating layer 16 that covers the flange portion 28.

[0020] The angle of the wound member 30 passing over the flange portion 28 is relatively small. As the angle of the wound member 30 becomes smaller, the ratio of the portion of the wound member 30 passing over the cylinder portion 18 to the portion of the wound member 30 passing over the dome portion 20 or the flange portion 28 becomes larger. As the number of turns of the wound member 30 passing over the flange portion 28 increases, the volume of the helical layer covering the cylinder portion 18 increases, even though the helical layer covering the cylinder portion 18 makes almost no contribution to reinforcing the cylinder portion 18.

[0021] The tank 10 of this embodiment includes a reinforcing piece 32 at a portion of the covering layer 16 that covers the flange portion 28. The reinforcing piece 32 is overlapped with the winding member 30.

[0022] 3 to 5 are conceptual diagrams of the operation of overlapping the reinforcing piece 32 on the wound member 30. The thin lines on the wound member 30 shown in Figs. 3 to 5 indicate the fiber direction of the wound member 30. The thin lines on the reinforcing piece 32 shown in Figs. 3 to 5 indicate the fiber direction of the reinforcing piece 32. As shown in Figs. 3 to 5, each time the wound member 30 is wound once around the flange portion 28, the reinforcing piece 32 is attached to a portion of the wound member 30 that passes over the flange portion 28. The reinforcing piece 32 may be attached in advance to the portion of the wound member 30 that passes over the flange portion 28.

[0023] The reinforcing piece 32 is made of fiber-reinforced resin. The longitudinal dimension of the reinforcing piece 32 is sufficiently smaller than the longitudinal dimension of the winding member 30. The longitudinal dimension of the reinforcing piece 32 is larger than the diameter D of the boss portion 26 of the nozzle 14 and smaller than the diameter E of the flange portion 28 of the nozzle 14 (see FIG. 3). The longitudinal dimension of the reinforcing piece 32 may be the same as the diameter E of the flange portion 28 of the nozzle 14 (see FIG. 3). The longitudinal dimension of the reinforcing piece 32 may be larger than the diameter E of the flange portion 28 of the nozzle 14 and smaller than the diameter F of the liner 12 (see FIG. 3). The width of the reinforcing piece 32 is approximately the same as the width of the winding member 30. The width of the reinforcing piece 32 may be wider than the width of the winding member 30. The width of the reinforcing piece 32 may be narrower than the width of the winding member 30.

[0024] The direction of the fibers contained in the fiber reinforced resin constituting the reinforcing piece 32 intersects with the direction of the fibers contained in the fiber reinforced resin constituting the portion of the wound member 30 that contacts the reinforcing piece 32. Hereinafter, the direction of the fibers contained in the fiber reinforced resin constituting the reinforcing piece 32 may be referred to as the direction of the fibers of the reinforcing piece 32.

[0025] 6 is a cross-sectional view of the vicinity of the nozzle 14 of the tank 10. In a portion of the covering layer 16 covering the flange portion 28, the winding member 30 and the reinforcing piece 32 are alternately laminated. In a portion of the covering layer 16 covering a part of the dome portion 20 adjacent to the flange portion 28, the winding member 30 and the reinforcing piece 32 may also be alternately laminated. The reinforcing piece 32 is biased toward the inside in the thickness direction of the covering layer 16. The reinforcing piece 32 is provided in an area that is at least half the thickness of the covering layer 16.

[0026] This makes it possible to reduce the number of turns of the wound member 30 passing over the flange portion 28 while maintaining the strength of the coating layer 16 that covers the flange portion 28. As a result, the volume of the helical layer that covers the cylinder portion 18 can be reduced.

[0027] Second Embodiment FIG. 7 is an image diagram of the operation of overlapping the reinforcing piece 36 on the wound member 30. The thin lines attached to the wound member 30 shown in FIG. 7 indicate the fiber direction of the wound member 30. The thin lines attached to the reinforcing piece 36 shown in FIG. 7 indicate the fiber direction of the reinforcing piece 36. In the first embodiment, the reinforcing piece 32 is overlapped on the wound member 30 every time the wound member 30 is wound once around the flange portion 28. In contrast, in the present embodiment, as shown in FIG. 7, the reinforcing piece 36 is overlapped on the wound member 30 every time one helical layer covering the flange portion 28 is formed.

[0028] Fig. 8A is a diagram showing a reinforcing piece 36. Fig. 8B is a diagram showing a reinforcing piece group 38. The thin lines on the reinforcing piece 36 shown in Figs. 8A and 8B indicate the direction of the fibers of the reinforcing piece 36. The reinforcing piece 36 is formed in a fan shape, and the fibers of the reinforcing piece 36 are aligned parallel to each other in a straight line. A disk-shaped reinforcing piece group 38 is formed by arranging eight reinforcing pieces 36. It is more preferable that the reinforcing piece 36 is formed to a size that allows the formation of a cross-sectional shape that becomes an equal tension curved surface in which the tension of each layer of the helical layer is constant.

[0029] Third embodiment FIG. 9 is an image diagram of the operation of overlapping the reinforcing piece 37 and the reinforcing piece 39 on the wound member 30. The thin lines attached to the wound member 30 shown in FIG. 9 indicate the fiber direction of the wound member 30. The thin lines attached to the reinforcing piece 37 shown in FIG. 9 indicate the fiber direction of the reinforcing piece 37. The thin lines attached to the reinforcing piece 39 shown in FIG. 9 indicate the fiber direction of the reinforcing piece 39. In the first embodiment, the reinforcing piece 32 is overlapped on the wound member 30 every time the wound member 30 is wound around the flange portion 28 once. In contrast, in the present embodiment, as shown in FIG. 9, the reinforcing piece 37 and the reinforcing piece 39 are overlapped on the wound member 30 every time one helical layer covering the flange portion 28 is formed.

[0030] Fig. 10A is a diagram showing a reinforcing piece 37. Fig. 10B is a diagram showing a reinforcing piece 39. Fig. 10C is a diagram showing a reinforcing piece group 41. The thin lines on the reinforcing piece 37 shown in Figs. 10A and 10C indicate the fiber direction of the reinforcing piece 37. The thin lines on the reinforcing piece 39 shown in Figs. 10B and 10C indicate the fiber direction of the reinforcing piece 39.

[0031] The reinforcing pieces 37 are formed in a rectangular shape, and the fibers of the reinforcing pieces 37 are aligned parallel to each other in a straight line. The reinforcing pieces 39 are formed in an isosceles triangle, and the fibers of the reinforcing pieces 39 are aligned parallel to each other in a straight line. A disk-shaped reinforcing piece group 41 is formed by arranging 30 reinforcing pieces 37 and 30 reinforcing pieces 39 alternately.

[0032] [Fourth embodiment] 11 is a cross-sectional view of the vicinity of the cap 14 of the tank 10. In this embodiment, a cushion member 40 is provided between the flange portion 28 and the covering layer 16.

[0033] The fiber reinforced resin has a lower strength against a force that is pulled in a direction perpendicular to the direction of the fibers than against a force that is pulled in a direction parallel to the direction of the fibers contained in the fiber reinforced resin. Therefore, when a sharp member comes into contact with the fiber reinforced resin, the fiber reinforced resin may be damaged. The outer peripheral edge of the flange portion 28 of the nozzle 14 has a sharp shape. Therefore, a resin cushion member has been provided between the flange portion 28 and the coating layer 16 in the past.

[0034] The rigidity of the resin constituting the cushion member is lower than the rigidity of the ferrule 14 and the coating layer 16. In addition, the strength of the resin constituting the cushion member is lower than the strength of the ferrule 14 and the coating layer 16. When a compressive load acts on the cushion member, the cushion member may deform or buckle. If the cushion member deforms or buckles, the ferrule 14 becomes more likely to move, and this may damage the ferrule 14 and the coating layer 16.

[0035] In place of the conventional resin cushion member, in this embodiment, a fiber-reinforced resin cushion member 40 is provided between the flange portion 28 and the covering layer 16.

[0036] FIG. 12A is a diagram showing a reinforcing piece 42 constituting the cushion member 40. FIG. 12B is a diagram showing a reinforcing piece 44 constituting the cushion member 40. The thin lines on the reinforcing piece 42 shown in FIG. 12A indicate the direction of the fibers of the reinforcing piece 42. The thin lines on the reinforcing piece 44 shown in FIG. 12B indicate the direction of the fibers of the reinforcing piece 44. The reinforcing piece 42 and the reinforcing piece 44 are made of fiber-reinforced resin. The reinforcing piece 42 is formed in a fan shape, and the fibers of the reinforcing piece 42 are arranged in parallel to each other in a straight line. A disk-shaped reinforcing piece group 46 is formed by arranging eight reinforcing pieces 42. The reinforcing piece 44 is formed in a disk shape, and the direction of the fibers of the reinforcing piece 44 is along the circumferential direction of the reinforcing piece 44.

[0037] The cushion member 40 is formed by alternately stacking the reinforcing piece groups 46 and the reinforcing pieces 44. As a result, the fiber direction of the reinforcing pieces 42 of the reinforcing piece group 46 intersects with the fiber direction of the reinforcing pieces 44. This makes it possible to form the cushion member 40 with relatively high hardness and strength. Therefore, even when a compressive load is applied to the cushion member 40, deformation and buckling of the cushion member 40 are suppressed. As a result, the base 14 does not move, and damage to the base 14 and the coating layer 16 can be suppressed.

[0038] Instead of the reinforcing piece 42 constituting the cushion member 40 shown in FIG. 12A, a group of reinforcing pieces 41 shown in FIG. 10C of the third embodiment may be used.

[0039] The cushion member 40 may be formed of a reinforcing piece different from the reinforcing piece 42 and the reinforcing piece 44. FIG. 13A is a diagram showing a reinforcing piece 48 constituting the cushion member 40. The thin lines on the reinforcing piece 48 shown in FIG. 13A indicate the direction of the fibers of the reinforcing piece 48. FIG. 13B is a diagram showing a reinforcing piece 50 constituting the cushion member 40. The thin lines on the reinforcing piece 50 shown in FIG. 13B indicate the direction of the fibers of the reinforcing piece 50. The reinforcing piece 48 and the reinforcing piece 50 are made of fiber-reinforced resin. The reinforcing piece 48 and the reinforcing piece 50 have the same shape. The reinforcing piece 48 is formed in a disk shape, and the fibers of the reinforcing piece 48 are aligned parallel to each other in a straight line. The reinforcing piece 50 is formed in a disk shape, and the fibers of the reinforcing piece 50 are aligned parallel to each other in a straight line.

[0040] The cushion member 40 is formed by overlapping the reinforcing pieces 48 and 50 alternately so that the fiber direction of the reinforcing pieces 48 and the fiber direction of the reinforcing pieces 50 intersect.

[0041] The fiber reinforced resin constituting each of the reinforcing pieces 42, 44, 48, and 50 does not have to have fibers extending in one direction. These fiber reinforced resins may have one fiber crossing another fiber to form a woven fabric.

[0042] In addition to the above disclosure, the following notes are also disclosed.

[0043] (Appendix 1) The tank (10) includes a liner (12), a cap (14) having a cylindrical boss portion (26) that communicates between the inside and outside of the liner, a flange portion (28) that protrudes from the boss portion in the radial direction of the boss portion, and a coating layer (16) including a wound member (30) wound multiple times around a winding target including the liner and the flange portion, and a reinforcing piece (32) that is separate from the wound member and overlaps the wound member is provided at a portion of the coating layer that covers the flange portion, and the direction of the fibers contained in the fiber reinforced resin that constitutes the reinforcing piece and the direction of the fibers contained in the fiber reinforced resin that constitutes the portion of the wound member that contacts the reinforcing piece intersect with each other. With this configuration, the number of turns of the winding member that passes over the flange portion can be reduced while maintaining the strength of the coating layer that covers the flange portion. Therefore, the volume of the helical layer that covers the cylinder portion can be reduced, which can contribute to cost reduction.

[0044] (Appendix 2) In the tank described in Appendix 1, the liner may have a cylinder portion (18) and a pair of dome portions (20) formed on both ends of the cylinder portion, and the cap may be provided on at least one of the dome portions. With this configuration, the volume of the helical layer covering the cylinder portion can be reduced.

[0045] (Appendix 3) In the tank described in Supplementary Note 1 or 2, the wound member and the reinforcing piece may be alternately laminated in the portion of the covering layer that covers the flange portion. With this configuration, even if the number of turns of the wound member that passes over the flange portion is reduced, the strength of the covering layer that covers the flange portion can be maintained.

[0046] (Appendix 4) In the tank described in Supplementary Note 1 or 2, the reinforcing piece may be biased toward the inner side in the thickness direction of the covering layer. With this configuration, even if the number of turns of the winding member passing over the flange portion is reduced, the strength of the covering layer covering the flange portion can be maintained.

[0047] (Appendix 5) In the tank described in Supplementary Note 4, the reinforcing piece may be provided in an area that is at least half the thickness of the covering layer. With this configuration, even if the number of turns of the winding member that passes over the flange portion is reduced, the strength of the covering layer that covers the flange portion can be maintained.

[0048] (Appendix 6) In the tank according to claim 1 or 2, one of the plurality of reinforcing pieces may be in contact with an outer surface of the flange portion. With this configuration, damage to the winding member can be suppressed.

[0049] (Appendix 7) The tank described in Supplementary Note 6 may further include another reinforcing piece that is overlapped with and in contact with the first reinforcing piece, and the direction of the fibers contained in the fiber reinforced resin constituting the first reinforcing piece may cross the direction of the fibers contained in the fiber reinforced resin constituting the other reinforcing piece at a portion where the first reinforcing piece and the other reinforcing piece are in contact with each other. With this configuration, it is possible to improve the strength of the cushion member provided between the covering layer and the flange portion.

[0050] (Appendix 8) A method for manufacturing a tank including a liner, a cap having a cylindrical boss portion communicating between the inside and outside of the liner, a flange portion protruding from the boss portion in the radial direction of the boss portion, and a coating layer including a wound member wound multiple times around a winding object including the liner and the flange portion, the method includes a winding step of winding the wound member around the winding object, and a reinforcing step of overlapping a reinforcing piece separate from the wound member on the wound member at a portion of the coating layer that covers the flange portion, the direction of the fibers included in the fiber reinforced resin that constitutes the reinforcing piece and the direction of the fibers included in the fiber reinforced resin that constitutes the portion of the winding member that contacts the reinforcing piece intersect with each other. According to this method, the number of turns of the winding member that passes over the flange portion can be reduced while maintaining the strength of the coating layer that covers the flange portion. Therefore, the volume of the helical layer that covers the cylinder portion can be reduced.

[0051] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0052] 10...Tank 12...Liner 14... Base 16... Coating layer 18: Cylinder section 20: Dome section 26: Boss portion 28: Flange portion 30... Winding member 32... Reinforcing piece

Claims

1. Raina and a nozzle having a cylindrical boss portion that communicates with an inside and an outside of the liner and a flange portion that protrudes from the boss portion in a radial direction of the boss portion; a covering layer including a wound member wound a plurality of times around a winding target including the liner and the flange portion; Equipped with a reinforcing piece that is separate from the winding member and overlaps the winding member is provided in a portion of the covering layer that covers the flange portion, A tank, wherein a direction of fibers contained in the fiber reinforced resin constituting the reinforcing piece and a direction of fibers contained in the fiber reinforced resin constituting the portion of the wound member that contacts the reinforcing piece intersect with each other.

2. 2. The tank according to claim 1, The liner has a cylinder portion and a pair of dome portions formed on both ends of the cylinder portion, The tank, wherein the cap is provided on at least one of the dome portions.

3. The tank according to claim 1 or 2, The tank, wherein the winding member and the reinforcing piece are alternately laminated in a portion of the covering layer that covers the flange portion.

4. The tank according to claim 1 or 2, The reinforcing piece is located unevenly on the inner side in the thickness direction of the covering layer.

5. The tank according to claim 4, A tank, wherein the reinforcing piece is provided over an area that is at least half the thickness of the covering layer.

6. The tank according to claim 1 or 2, A tank, wherein one of the plurality of reinforcing pieces is in contact with an outer surface of the flange portion.

7. 7. The tank according to claim 6, Further comprising another reinforcing piece overlapping the first reinforcing piece and contacting the first reinforcing piece, A tank in which, at the portion where the one reinforcing piece and the other reinforcing piece are in contact with each other, the direction of the fibers contained in the fiber reinforced resin constituting the one reinforcing piece intersects with the direction of the fibers contained in the fiber reinforced resin constituting the other reinforcing piece.

8. Raina and a nozzle having a cylindrical boss portion that communicates with an inside and an outside of the liner and a flange portion that protrudes from the boss portion in a radial direction of the boss portion; a covering layer including a wound member wound a plurality of times around a winding target including the liner and the flange portion; A method for manufacturing a tank comprising: a winding step of winding the winding member around the winding target; a reinforcing step of overlapping a reinforcing piece, which is separate from the wound member, on the wound member at a portion of the covering layer that covers the flange portion; having A method for manufacturing a tank, wherein the direction of fibers contained in the fiber reinforced resin constituting the reinforcing piece and the direction of fibers contained in the fiber reinforced resin constituting the portion of the winding member that contacts the reinforcing piece intersect with each other.

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