Tank and tank manufacturing method

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] Patent Document 1 below discloses a tank for storing high-pressure hydrogen gas. The tank has a liner with a cylindrical body and dome-shaped side ends. Mouthpieces are attached to both ends of the liner. The outer surfaces of the liner and mouthpieces 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 Patent Document 1, a sheet made of fiber-reinforced resin is wound around a liner. After being wound around the liner and becoming cylindrical, the sheet is then cut into a plurality of notches at the end to form small pieces. These small pieces cover the side edges of the liner. However, a tank that can better cover the liner with a coating 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 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 winding member that contacts the reinforcing piece intersect 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 connecting 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 wound member around the winding object; and a reinforcing step of overlapping a reinforcing piece that is separate from the wound member on the wound member at a portion of the coating layer that covers the flange portion, wherein 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 winding member that contacts the reinforcing piece intersect with each other. [Effects of the Invention]

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

[0009] [Figure 1] FIG. 1 is a cross-sectional view of the tank. [Figure 2] FIG. 2 is a diagram illustrating a method for winding the winding member. [Figure 3] FIG. 3 is an image diagram of the process of overlapping the reinforcing piece onto the wound member. [Figure 4]FIG. 4 is an image diagram of the process of overlapping the reinforcing piece onto the wound member. [Figure 5] FIG. 5 is an image diagram of the process of overlapping the reinforcing piece onto 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 an image diagram of the process of overlapping the reinforcing piece onto 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 an image diagram of the process of overlapping the reinforcing piece onto 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 that constitutes the cushion member, and Fig. 12B is a diagram showing a reinforcing piece that constitutes the cushion member. [Figure 13] Fig. 13A is a diagram showing a reinforcing piece that constitutes the cushion member, and Fig. 13B is a diagram showing a reinforcing piece that constitutes the cushion member. DETAILED DESCRIPTION OF THE INVENTION

[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 by way of preferred embodiments with reference to 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 that is mounted on a fuel cell vehicle and stores hydrogen gas used as fuel gas in the fuel cell vehicle. The gas stored in the tank 10 is not limited to hydrogen gas, but may also 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, but may also be a tank mounted on a vehicle that transports gas, or a tank installed in ground equipment that stores gas.

[0012] The tank 10 includes 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 relatively high hydrogen gas barrier properties. 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 that protrudes 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 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 an axis A. The filament winding device is a device that winds 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 fibers are impregnated with resin. Examples of the fibers include carbon fiber and glass fiber. Examples of the resin include thermosetting resins such as epoxy and polyester. The direction of the fibers contained in the fiber-reinforced resin that constitutes 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 that constitutes the winding member 30 may simply be referred to as the fiber direction of the winding member 30. By winding the winding member 30 around the liner 12, the fiber-reinforced resin is layered, forming the coating layer 16. The coating layer 16 is hardened by applying pressure and heat together with the liner 12.

[0017] [About winding of winding components] FIG. 2 is a diagram illustrating a winding method for the winding member 30. The winding method for the winding member 30 includes hoop winding and helical winding. The winding method for the winding member 30a in FIG. 2 is hoop winding. In a side view of the liner 12, the angle between the axis A and the longitudinal direction of the winding member 30a is approximately 90 degrees. The winding method for 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, the 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, the angle C formed between the axis A and the longitudinal direction of the winding member 30c is smaller than the 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 of the covering layer 16, which is composed of wound members 30 wound by hoop winding. The dome portion 20 and the flange portion 28 are reinforced by a helical layer of the covering layer 16, which is composed of wound members 30 wound by helical winding. The wound members 30 wound by helical winding around the dome portion 20 and the flange portion 28 are 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 contributes very little to reinforcing the cylinder portion 18.

[0019] High stress is applied to the base of the flange portion 28 of the nozzle 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 proportion of the portion of the wound member 30 passing over the cylinder portion 18 increases relative to the portion of the wound member 30 passing over the dome portion 20 or the flange portion 28. 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 contributes little 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 illustrating the process of overlapping the reinforcing piece 32 onto the wound member 30. The thin lines attached to the wound member 30 shown in FIGS. 3 to 5 indicate the fiber direction of the wound member 30. The thin lines attached to 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 the 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 wound 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 wound member 30. The width of the reinforcing piece 32 may be wider than the width of the wound member 30. The width of the reinforcing piece 32 may be narrower than the width of the wound member 30.

[0024] The direction of the fibers contained in the fiber reinforced resin that constitutes the reinforcing piece 32 intersects with the direction of the fibers contained in the fiber reinforced resin that constitutes the portion of the winding member 30 that contacts the reinforcing piece 32. Hereinafter, the direction of the fibers contained in the fiber reinforced resin that constitutes 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 the portion of the covering layer 16 that covers the flange portion 28, winding members 30 and reinforcing pieces 32 are alternately laminated. In the portion of the covering layer 16 that covers a part of the dome portion 20 adjacent to the flange portion 28, winding members 30 and reinforcing pieces 32 may also be alternately laminated. The reinforcing pieces 32 are biased toward the inside in the thickness direction of the covering layer 16. The reinforcing pieces 32 are provided in an area that occupies at least half of 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 process 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 around the flange portion 28 once. 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 attached to the reinforcing pieces 36 shown in FIGS. 8A and 8B indicate the direction of the fibers of the reinforcing pieces 36. The reinforcing pieces 36 are formed in a fan shape, and the fibers of the reinforcing pieces 36 are aligned in straight lines parallel to each other. Eight reinforcing pieces 36 are arranged in a row to form a disk-shaped reinforcing piece group 38. It is more preferable that the reinforcing pieces 36 be formed to a size that allows the formation of a cross-sectional shape that forms an equal-tension curved surface in which the tension in each helical layer is constant.

[0029] Third Embodiment FIG. 9 is an image diagram of the process of overlapping reinforcing piece 37 and reinforcing piece 39 on wound member 30. The thin lines attached to wound member 30 shown in FIG. 9 indicate the fiber direction of wound member 30. The thin lines attached to reinforcing piece 37 shown in FIG. 9 indicate the fiber direction of reinforcing piece 37. The thin lines attached to reinforcing piece 39 shown in FIG. 9 indicate the fiber direction of reinforcing piece 39. In the first embodiment, reinforcing piece 32 is overlapped on wound member 30 every time the wound member 30 is wound around flange portion 28 once. In contrast, in this embodiment, as shown in FIG. 9, reinforcing piece 37 and reinforcing piece 39 are overlapped on wound member 30 every time one helical layer covering 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 direction of the fibers of the reinforcing piece 37. The thin lines on the reinforcing piece 39 shown in Figs. 10B and 10C indicate the direction of the fibers 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 shape, 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 nozzle 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] Fiber-reinforced resin has lower strength against a force perpendicular to the direction of the fibers than against a force parallel to the direction of the fibers contained in the fiber-reinforced resin. Therefore, if 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 conventionally been provided between the flange portion 28 and the coating layer 16.

[0034] The rigidity of the resin constituting the cushion member is lower than the rigidity of the nozzle 14 and the coating layer 16. The strength of the resin constituting the cushion member is also lower than the strength of the nozzle 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 nozzle 14 becomes more likely to move, which may damage the nozzle 14 and the coating layer 16.

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

[0036] FIG. 12A is a diagram showing a reinforcing piece 42 that constitutes the cushion member 40. FIG. 12B is a diagram showing a reinforcing piece 44 that constitutes the cushion member 40. The thin lines attached to the reinforcing piece 42 shown in FIG. 12A indicate the direction of the fibers of the reinforcing piece 42. The thin lines attached to the reinforcing piece 44 shown in FIG. 12B indicate the direction of the fibers of the reinforcing piece 44. The reinforcing pieces 42 and 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 aligned linearly and parallel to each other. Eight reinforcing pieces 42 are arranged to form a disk-shaped reinforcing piece group 46. 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 allows the formation of a 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 mouthpiece 14 does not move, and damage to the mouthpiece 14 and the coating layer 16 can be suppressed.

[0038] Instead of the reinforcing pieces 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 reinforcing pieces different from the reinforcing pieces 42 and 44. FIG. 13A is a diagram showing a reinforcing piece 48 that constitutes the cushion member 40. The thin lines attached to 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 that constitutes the cushion member 40. The thin lines attached to 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 linearly and parallel to each other. The reinforcing piece 50 is formed in a disk shape, and the fibers of the reinforcing piece 50 are aligned linearly and parallel to each other.

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

[0041] The fibers of the fiber reinforced resin constituting each of the reinforcing pieces 42, 44, 48, and 50 do not have to extend 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 additional notes are also disclosed.

[0043] (Appendix 1) The tank (10) includes a liner (12), a nozzle (14) having a cylindrical boss (26) connecting the interior and exterior of the liner with each other and a flange (28) protruding radially from the boss, and a coating layer (16) including a wound member (30) wound multiple times around a winding target including the liner and the flange. A reinforcing piece (32) separate from the wound member and overlapping the wound member is provided in the portion of the coating layer covering the flange, and the fiber-reinforced resin constituting the reinforcing piece has a fiber orientation that intersects with the fiber orientation of the fiber-reinforced resin constituting the portion of the wound member that contacts the reinforcing piece. This configuration reduces the number of turns of the wound member passing over the flange while maintaining the strength of the coating layer covering the flange. This reduces the volume of the helical layer covering the cylinder, ultimately contributing 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 nozzle 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, the strength of the covering layer that covers the flange portion can be maintained even if the number of turns of the wound member that passes over the flange portion is reduced.

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

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

[0048] (Appendix 6) In the tank described in Supplementary Note 1 or 2, one of the plurality of reinforcing pieces may be in contact with the 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 that constitutes the first reinforcing piece may intersect the direction of the fibers contained in the fiber-reinforced resin that constitutes the other reinforcing piece at the location where the first reinforcing piece and the other reinforcing piece are in contact with each other. This configuration can 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 nozzle having a cylindrical boss connecting the interior and exterior of the liner and a flange protruding radially from the boss, and a coating layer including a wound member wound multiple times around a winding target including the liner and the flange, the method comprising: a winding step of winding the wound member around the winding target; and a reinforcing step of overlapping a reinforcing piece, separate from the wound member, with the wound member at a portion of the coating layer covering the flange, the fiber-reinforced resin constituting the reinforcing piece and the fiber-reinforced resin constituting the portion of the winding member that contacts the reinforcing piece. This method reduces the number of turns of the wound member over the flange while maintaining the strength of the coating layer covering the flange. This reduces the volume of the helical layer covering the cylinder.

[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... Cap 16... Coating layer 18...Cylinder section 20...Dome section 26...Boss portion 28...Flange portion 30... Winding member 32... Reinforcement piece

Claims

1. With Lina, a nozzle having a cylindrical boss portion that communicates the inside and 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 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; The reinforcing piece is provided in plurality, In a portion of the covering layer that covers the flange portion, the winding member is disposed between one of the reinforcing pieces and another of the reinforcing pieces in a thickness direction of the covering layer.

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 nozzle is provided on at least one of the dome portions.

3. 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.

4. With Lina, a nozzle having a cylindrical boss portion that communicates the inside and 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 winding member, on the winding member at a portion of the covering layer that covers the flange portion; and 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; The reinforcing piece is provided in plurality, A method for manufacturing a tank, wherein the winding member is arranged between one of the reinforcing pieces and another of the reinforcing pieces in the thickness direction of the coating layer in a portion of the coating layer that covers the flange portion.

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