High-pressure gas tank

Abstract

To provide a high-pressure gas tank capable of suppressing idling of a mouthpiece during filament winding, and capable of suppressing deformation of a liner due to high-pressure gas filled inside a liner, and a manufacturing method therefor.SOLUTION: A mouthpiece 18 of a high-pressure gas tank 10 has a first member 40 located on the inner surface side of a liner 14, and a second member 42 located on the outer surface side of the liner 14 and connected to the first member 40. A rotation restriction structure 56 comprises a first rotation restriction part 58 provided on an inner surface 17 of the liner 14, and a second rotation restriction part 60 provided on the first member 40 so as to be fitted into the first rotation restriction part 58.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to high-pressure gas tanks. In K

Background Art

[0002] A high-pressure gas tank is mounted on a fuel cell vehicle for storing, for example, hydrogen gas to be supplied to a fuel cell system. This type of high-pressure gas tank includes a resin liner having a filling chamber capable of filling gas, a reinforcing layer made of a fiber-reinforced resin that covers the outer surface of the liner to reinforce the liner, and a base attached to an axial end of the liner. The reinforcing layer is generally formed by filament winding. In filament winding, a rotational force is applied to the liner through the base from a shaft fixed to the base, and a plurality of resin-impregnated reinforcing fibers (FRP) are wound around the outer surface of the rotating liner.

[0003] For example, Patent Document 1 discloses a technique for suppressing the idle rotation of the base with respect to the liner during filament winding by fitting a rotation restricting convex portion provided on the outer surface of the liner into a rotation restricting concave portion provided on the flange portion of the base.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the prior art described in Patent Document 1 as described above, there is a risk that the liner may deform so as to fill the gap between the rotation restricting convex portion and the rotation restricting concave portion due to the gas in the filling chamber of the liner.

[0006] ​The present invention has been made in consideration of such problems, and it is possible to suppress the idling of the base with respect to the liner during filament winding, and it is possible to suppress the deformation of the liner due to the gas in the filling chamber of the liner. A high-pressure gas tank K to is provided for the purpose.

Means for Solving the Problems

[0007] One aspect of the present invention is a liner formed by joining a plurality of resin-made divided liners in the axial direction and having a gas filling chamber formed therein, a reinforcing layer formed by winding a plurality of fibers around the outer surface of the liner, and a base provided at an end opening in the axial direction of the liner and having a supply / discharge hole formed for supplying and discharging gas to / from the filling chamber, and a rotation restricting structure for restricting the rotation of the base with respect to the liner around the axis of the liner. The base has a first member located on the inner surface side of the liner and a second member located on the outer surface side of the liner and connected to the first member. The rotation restricting structure includes a first rotation restricting portion provided on the inner surface of the liner and a second rotation restricting portion provided on the first member so as to fit into the first rotation restricting portion. See, the first member has a cylindrical portion inserted into the end opening of the liner. The first rotation restricting portion has a fitting recess provided in a portion of the inner surface of the liner adjacent to the end opening. The second rotation restricting portion has a fitting protrusion provided in a portion of the cylindrical portion located on the inner surface side of the liner and fitting into the fitting recess. The liner has a dome portion that tapers inward in the axial direction of the liner, and an annular concave wall portion that depresses inward in the axial direction of the liner from the reduced-diameter end of the dome portion and has the end opening formed at the center. The annular concave wall portion includes an annular inclined portion that extends so as to incline inward in the axial direction of the liner from the reduced-diameter end of the dome portion toward the inner diameter side of the liner, an annular connecting portion that extends inward in the diameter direction of the liner from the extending end of the annular inclined portion, and a cylindrical convex portion that protrudes outward in the axial direction of the liner from the extending end of the annular connecting portion. The second rotation restricting portion is formed so as to straddle the cylindrical convex portion and the annular connecting portion It is a high-pressure gas tank.

[0008] Another aspect of the present invention is a liner formed by joining a plurality of resin-made divided liners in the axial direction and having a gas filling chamber formed therein and a reinforcing layer formed by winding fibers around the outer surface of the liner a plurality of times, a base provided at an end opening in the axial direction of the liner and having a supply / discharge hole formed therein for supplying and discharging gas to / from the filling chamber, and a rotation restricting structure for restricting rotation of the base with respect to the liner about the axis of the liner. The base includes a first member located on the inner surface side of the liner and a second member located on the outer surface side of the liner and connected to the first member. The rotation restricting structure includes a first rotation restricting portion provided on the inner surface of the liner and a second rotation restricting portion provided on the first member so as to fit into the first rotation restricting portion. The first member has a cylindrical portion inserted into the end opening of the liner. The first rotation restricting portion has a fitting recess provided in a portion of the inner surface of the liner adjacent to the end opening. The second rotation restricting portion has a fitting protrusion provided in a portion of the cylindrical portion located on the inner surface side of the liner and fitting into the fitting recess. The liner has a dome portion that tapers outward in the axial direction of the liner, and an annular wall portion that extends inward in the axial direction of the liner from the tapered end of the dome portion and has the end opening formed at the center. The annular wall portion includes an annular inclined portion that extends inward in the radial direction of the liner from the tapered end of the dome portion, an annular connecting portion that extends inward in the radial direction of the liner from the extending end of the annular inclined portion, and a cylindrical protrusion that protrudes outward in the axial direction of the liner from the extending end of the annular connecting portion. The second rotation restricting portion is formed so as to straddle the cylindrical protrusion and the annular connecting portion, and the first member and the second member sandwich the liner in the axial direction of the liner is a high-pressure gas tank in there is.

Effects of the Invention

[0009] According to the present invention, since the rotation restricting structure (the first rotation restricting portion and the second rotation restricting portion) is provided, it is possible to suppress the idling of the base with respect to the liner during filament winding. Further, the first rotation restricting portion and the second rotation restricting portion are located on the inner surface side rather than the outer surface side of the liner. Therefore, the liner is not deformed by the gas in the filling chamber of the liner toward the gap between the first rotation restricting portion and the second rotation restricting portion. Accordingly, it is possible to suppress the deformation of the liner due to the gas in the filling chamber of the liner.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0011] Hereinafter, preferred embodiments of the high-pressure gas tank and its manufacturing method according to the present invention will be described with reference to the accompanying drawings.

[0012] The high-pressure gas tank 10 according to the present embodiment shown in FIG. 1 is, for example, a fuel tank (hydrogen tank) mounted on a fuel cell vehicle. When the high-pressure gas tank 10 is mounted on a fuel cell vehicle, the high-pressure gas tank 10 is filled with hydrogen gas at high pressure. The hydrogen gas is supplied to the anode of a fuel cell (or a fuel cell stack) mounted on the fuel cell vehicle.

[0013] The high-pressure gas tank 10 may be a tank applied to other than fuel cell vehicles. The high-pressure gas tank 10 may be a fuel gas tank for storing a fuel gas other than hydrogen gas, or a gas tank used for a facility for filling the fuel gas into the fuel gas tank, or a gas tank used for transporting the gas. The high-pressure gas tank 10 may be a tank for storing compressed natural gas or liquefied petroleum gas.

[0014] The high-pressure gas tank 10 includes a liner 14 in which a filling chamber 12 for high-pressure gas is formed inside, a reinforcing layer 16 covering the liner 14, and two caps 18 provided at both axial ends of the liner 14.

[0015] The liner 14 is made of, for example, high-density polyethylene (HDPE) resin exhibiting hydrogen barrier properties. In this case, since the HDPE resin is inexpensive and easy to process, there is an advantage that the liner 14 can be manufactured at low cost and easily. Further, since the HDPE resin is excellent in strength and rigidity, it is suitable for the liner 14 of the high-pressure gas tank 10.

[0016] End openings 20 to which the caps 18 are attached are formed at both axial ends of the liner 14. The liner 14 is formed by joining a plurality of resin-made split liners 15 in the axial direction. In the present embodiment, the liner 14 is formed by joining two split liners 15 having a symmetric shape. That is, in the present embodiment, each split liner 15 is an end split liner 22 having an axial end of the liner 14 to which the cap 18 is attached.

[0017] The liner 14 may be formed by joining three or more divided liners 15 in the axial direction. In this case, the liner 14 will have two end divided liners 22 located at both ends in the axial direction and one or more intermediate divided liners having a cylindrical shape located in the middle.

[0018] The two divided liners 15 have the same configuration as each other. The divided liner 15 has a hollow body portion 24 having a substantially cylindrical shape, a dome portion 26 whose diameter gradually decreases from the body portion 24 toward the outside in the axial direction of the liner 14, and an annular concave wall portion 28 that is recessed inward in the axial direction of the divided liner 15 from the reduced-diameter end portion of the dome portion 26.

[0019] In this embodiment, the inner diameter and the outer diameter of the body portion 24 are substantially constant. Note that the inner diameter and the outer diameter of the body portion 24 may be tapered so as to decrease or increase in diameter toward the dome portion 26.

[0020] As shown in FIG. 2, the annular concave wall portion 28 has an annular inclined portion 30, an annular connecting portion 32, and a cylindrical convex portion 34. The annular inclined portion 30 extends so as to incline inward in the axial direction of the liner 14 from the reduced-diameter end portion of the dome portion 26 toward the inside in the radial direction of the liner 14. The annular connecting portion 32 extends inward in the radial direction of the liner 14 from the extending end portion (the end portion inward in the axial direction of the liner 14) of the annular inclined portion 30. The cylindrical convex portion 34 protrudes outward in the axial direction of the liner 14 from the extending end portion (the end portion inward in the radial direction of the liner 14) of the annular connecting portion 32. The inner hole of the cylindrical convex portion 34 forms the end opening 20 of the liner 14.

[0021] In FIG. 1, the reinforcing layer 16 is formed of a fiber-reinforced resin (FRP) in which a resin base material is impregnated with reinforcing fibers. That is, the reinforcing layer 16 is a laminate formed by winding impregnated fibers (filaments. Hereinafter, simply referred to as "fibers 36") impregnated with resin a plurality of times by filament winding and then curing the resin by heating, for example. Examples of FRP include CFRP, GFRP, and the like.

[0022] The base 18 is a cylindrical member formed with supply and discharge holes 38 for supplying and discharging high-pressure gas to and from the liner 14, and is made of, for example, metal. The two bases 18 are similarly configured to each other. Note that the base 18 may be provided only at one end in the axial direction of the liner 14.

[0023] As shown in FIG. 2, the base 18 has a first member 40 located on the inner surface side of the liner 14 and a second member 42 connected to the first member 40 so as to be located on the outer surface side of the liner 14. The first member 40 includes a cylindrical tubular portion 44 inserted through the end opening 20.

[0024] The tubular portion 44 is formed longer than the cylindrical convex portion 34. One end of the tubular portion 44 is located outside the liner 14. The other end of the tubular portion 44 is located on the inner surface side (inside the filling chamber 12) of the liner 14. The outer peripheral surface of the tubular portion 44 is in contact with the inner peripheral surface of the cylindrical convex portion 34. A male thread 46 is provided on a portion of the outer peripheral surface of the tubular portion 44 that is axially outward of the liner 14 with respect to the cylindrical convex portion 34.

[0025] The second member 42 has a cylindrical boss portion 48 and a flange portion 50 provided on the boss portion 48. An annular convex wall portion 52 protruding radially inward is provided on the inner surface of the boss portion 48. A female thread 54 that engages with the male thread 46 of the first member 40 is provided on the inner surface of the boss portion 48 on the filling chamber 12 side with respect to the convex wall portion 52. That is, the first member 40 and the second member 42 are connected to each other by screwing (threaded connection) of the male thread 46 and the female thread 54. The boss portion 48 is in contact with the outer surface of the annular connection portion 32 and the outer surface of the cylindrical convex portion 34.

[0026] The flange portion 50 protrudes radially outward from the boss portion 48 and extends in a ring shape. The flange portion 50 is in contact with the outer surface of the annular inclined portion 30. Further, the outer surface of the flange portion 50 that faces axially outward of the liner 14 is flush with the outer surface of the dome portion 26.

[0027] As shown in Fig. 1, in such a high-pressure gas tank 10, rotation restricting structures 56 for restricting the rotation of the base 18 with respect to the liner 14 centered on the axis of the liner 14 are provided at both axial ends of the liner 14. The rotation restricting structure 56 includes a first rotation restricting portion 58 provided on the inner surface 17 (the inner surface at the axial end of the liner 14) of the liner 14 (each end-partitioned liner 22), and a second rotation restricting portion 60 provided on the first member 40 of the base 18 so as to fit into the first rotation restricting portion 58. The first rotation restricting portion 58 and the second rotation restricting portion 60 located on one end side of the high-pressure gas tank 10 are configured in the same manner as the first rotation restricting portion 58 and the second rotation restricting portion 60 located on the other end side of the high-pressure gas tank 10.

[0028] As shown in Figs. 2 and 3, the first rotation restricting portion 58 is provided at a portion of the inner surface 17 of the liner 14 adjacent to the end opening 20. The first rotation restricting portion 58 has a plurality (for example, six) of fitting recesses 62 extending radially outward from the end opening 20 of the liner 14. In Fig. 3, the plurality of fitting recesses 62 are provided at equal intervals in the circumferential direction of the liner 14 when viewed from the axial direction of the liner 14 (in a cross section perpendicular to the axis of the liner 14). Each fitting recess 62 is formed in a rectangular shape when viewed from the axial direction of the liner 14. The fitting recesses 62 are provided so as to straddle the cylindrical convex portion 34 and the annular connecting portion 32 (see Fig. 2).

[0029] In Figs. 2 and 3, the second rotation restricting portion 60 is provided at a portion of the cylindrical portion 44 located on the inner surface side (filling chamber 12) of the liner 14. The second rotation restricting portion 60 has a plurality (for example, six) of fitting protrusions 64 protruding radially outward from the other end of the cylindrical portion 44 so as to be inserted (fitted) into the fitting recesses 62. That is, the first member 40 is an integrally formed product having the cylindrical portion 44 and the plurality of fitting protrusions 64. Therefore, the first member 40 and the second member 42 sandwich the cylindrical convex portion 34, which is the inner peripheral wall portion of the end opening 20 of the liner 14, from the axial direction of the liner 14 by screw connection.

[0030] As shown in FIG. 3, the fitting convex portion 64 is formed in a shape corresponding to the fitting concave portion 62. That is, the fitting convex portions 64 are provided at equal intervals in the circumferential direction of the cylindrical portion 44 when viewed from the axial direction of the liner 14. Each fitting convex portion 64 is formed in a rectangular shape when viewed from the axial direction of the liner 14. The number, shape, position, size, etc. of the fitting concave portion 62 and the fitting convex portion 64 can be set as appropriate.

[0031] Next, a method for manufacturing the high-pressure gas tank 10 will be exemplified.

[0032] As shown in FIG. 4, the method for manufacturing the high-pressure gas tank 10 includes a preparation step, a base attachment step, a joining step, and a reinforcing layer formation step.

[0033] In the preparation step (step S1), two end split liners 22 having an end opening 20 in the axial direction of the liner 14 to which the base 18 is attached among the plurality of split liners 15 are prepared. The base attachment step is performed for each end split liner 22.

[0034] In the base attachment step (step S2 in FIG. 4), as shown in FIG. 5, a first member 40 forming the base 18 is inserted into the end opening 20 of the end split liner 22 from the inner surface side of the end split liner 22. As a result, a part of the first member 40 is located on the inner surface side of the end split liner 22. At this time, a plurality of fitting convex portions 64 are fitted into a plurality of fitting concave portions 62 provided on the inner surface 17 of the end split liner 22. Thereby, the relative rotation between the first member 40 and the split liner 15 is restricted.

[0035] Subsequently, a second member 42 forming the base 18 is connected to the first member 40 so as to be located on the outer surface side of the end split liner 22. That is, the female screw 54 of the second member 42 is screwed to the male screw 46 of the first member 40. Thereby, the cylindrical convex portion 34 (the inner peripheral wall portion of the end opening 20) is clamped between the first member 40 and the second member 42.

[0036] In the joining step (step S3 in FIG. 4), as shown in FIG. 6, the body portions 24 of one end-portion divided liner 22 and the body portions 24 of the other end-portion divided liner 22 are butted against each other, and the butted portion is joined around the circumference. Thereby, the liner 14 in which the end-portion divided liners 22 are integrated is formed. In the joining step, various methods such as arc welding such as TIG welding, laser welding, and welding can be adopted. When the liner 14 is divided into three or more parts, an intermediate liner is arranged and joined between the two end-portion divided liners 22.

[0037] In the reinforcing layer forming step (step S4 in FIG. 4), as shown in FIG. 7, while rotating the liner 14 by applying a rotational force centered on the axis of the liner 14 to the base 18, a plurality of fibers 36 are wound around the outer surface of the liner 14 to form the reinforcing layer 16. Specifically, in the reinforcing layer forming step (filament winding step), for example, the shaft 102 of the filament winding device 100 is rotated with the shaft 102 fixed to both bases 18 (first members 40). Then, since the relative rotation between the first member 40 and the liner 14 is restricted by the rotation restricting structure 56, the rotational force (torque) transmitted from the shaft 102 to the first member 40 is efficiently transmitted to the liner 14. That is, the idling of the base 18 with respect to the liner 14 is suppressed. Thereby, the high-pressure gas tank 10 is manufactured.

[0038] The present embodiment has the following effects.

[0039] According to the present embodiment, since the rotation restricting structure 56 (the first rotation restricting portion 58 and the second rotation restricting portion 60) is provided, the idling of the base 18 with respect to the liner 14 during filament winding can be suppressed. Further, the first rotation restricting portion 58 and the second rotation restricting portion 60 are located on the inner surface side rather than the outer surface side of the liner 14. Therefore, the liner 14 is not deformed toward the gap between the first rotation restricting portion 58 and the second rotation restricting portion 60 by the gas (high-pressure gas) in the filling chamber 12 of the liner 14. Accordingly, the deformation of the liner 14 due to the gas in the filling chamber 12 of the liner 14 can be suppressed.

[0040] The first member 40 has a cylindrical portion 44 that is inserted into the end opening 20 of the liner 14. The first rotation restricting portion 58 is provided at a portion of the inner surface 17 of the liner 14 adjacent to the end opening 20. The second rotation restricting portion 60 is provided at a portion of the cylindrical portion 44 located on the inner surface side of the liner 14.

[0041] According to such a configuration, it is possible to suppress the increase in size of the base 18.

[0042] The cylindrical portion 44 is formed in a cylindrical shape. The first rotation restricting portion 58 has a fitting recess 62 that extends radially outward from the end opening 20. The second rotation restricting portion 60 has a fitting projection 64 that projects radially outward from the cylindrical portion 44 so as to be inserted into the fitting recess 62. A plurality of fitting recesses 62 and fitting projections 64 are provided in the circumferential direction of the cylindrical portion 44.

[0043] According to such a configuration, by fitting the fitting projection 64 into the fitting recess 62, it is possible to effectively suppress the idling of the base 18 with respect to the liner 14 during filament winding. Further, the rotational force acting on the base 18 during filament winding can be efficiently transmitted to the liner 14.

[0044] The first member 40 and the second member 42 sandwich the liner 14 in the axial direction of the liner 14 by screw connection.

[0045] According to such a configuration, the base 18 can be fixed to the liner 14 in the axial direction and the circumferential direction of the liner 14.

[0046] The liner 14 has a dome portion 26 that tapers in diameter outward in the axial direction of the liner 14, and an annular concave wall portion 28 that is recessed inward in the axial direction of the liner 14 from the diameter-reduced end of the dome portion 26 and has an end opening 20 formed at the center. The annular concave wall portion 28 includes an annular inclined portion 30 that extends so as to be inclined inward in the axial direction of the liner 14 from the diameter-reduced end of the dome portion 26 toward the inner diameter of the liner 14, an annular connecting portion 32 that extends inward in the diameter direction of the liner 14 from the extended end of the annular inclined portion 30, and a cylindrical convex portion 34 that protrudes outward in the axial direction of the liner 14 from the extended end of the annular connecting portion 32. The second rotation restricting portion 60 is formed so as to straddle the cylindrical convex portion 34 and the annular connecting portion 32.

[0047] According to such a configuration, it is possible to shorten the axial length of the high-pressure gas tank 10.

[0048] In the embodiment shown in FIG. 8 (first modification), the first rotation restricting portion 58 has a fitting recess 70 formed on the inner surface 17 of the liner 14, and the second rotation restricting portion 60 includes a fitting convex portion 72 that fits into the fitting recess 70. The fitting recess 70 and the fitting convex portion 72 have a polygonal outer shape when viewed from the axial direction of the liner 14. In the example of FIG. 8, the fitting recess 70 and the fitting convex portion 72 are formed in a square shape (rectangular shape) when viewed from the axial direction of the liner 14. The outer shape of the fitting recess 70 and the fitting convex portion 72 when viewed from the axial direction of the liner 14 is not limited to a square shape, but is preferably a polygonal shape having 4 or more and 8 or less corners.

[0049] In this case, since the fitting recess 70 and the fitting convex portion 72 have a polygonal outer shape when viewed from the axial direction of the liner 14, it is possible to suppress the idling of the base 18 with respect to the liner 14 during filament winding.

[0050] In the embodiment shown in FIG. 9 (second modification), the liner 14 is not provided with the annular concave wall portion 28, and a base 74 is provided at the diameter-reduced end of the dome portion 26. Further, the second member 76 of the base 74 does not include the flange portion 50 described above.

[0051] In this case, since the contact area between the base 74 and the reinforcing layer 16 can be reduced, it is possible to effectively suppress the rubbing between the base 74 and the reinforcing layer 16 during repeated use of the high-pressure gas tank 10, which may cause both to wear and become a starting point for fracture.

[0052] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

[0053] Summarizing the above embodiments, it is as follows.

[0054] The above-described embodiment is a high-pressure gas tank (10) comprising: a liner (14) in which a plurality of resin-made split liners (15) are joined in the axial direction and a gas filling chamber (12) is formed inside; a reinforcing layer (16) formed by winding a plurality of fibers (36) around the outer surface of the liner; a base (18, 74) provided at an end opening (20) in the axial direction of the liner and having a supply / discharge hole (38) formed therein for supplying / discharging gas to / from the filling chamber; and a rotation restricting structure (56) for restricting the rotation of the base with respect to the liner about the axis of the liner. The base has a first member (40) located on the inner surface side of the liner and a second member (42, 76) located on the outer surface side of the liner and connected to the first member. The rotation restricting structure includes a first rotation restricting portion (58) provided on the inner surface (17) of the liner and a second rotation restricting portion (60) provided on the first member so as to fit into the first rotation restricting portion.

[0055] In the above high-pressure gas tank, the first member may have a cylindrical portion (44) inserted into the end opening of the liner, the first rotation restricting portion may be provided at a portion of the inner surface of the liner adjacent to the end opening, and the second rotation restricting portion may be provided at a portion of the cylindrical portion located on the inner surface side of the liner.

[0056] In the above high-pressure gas tank, the cylindrical portion is formed in a cylindrical shape. The first rotation restricting portion has a fitting recess (62) extending radially outward from the end opening. The second rotation restricting portion has a fitting protrusion (64) protruding radially outward from the cylindrical portion so as to be inserted into the fitting recess. A plurality of the fitting recesses and the fitting protrusions may be provided in the circumferential direction of the cylindrical portion.

[0057] In the above high-pressure gas tank, the first rotation restricting portion has a fitting recess (70) formed on the inner surface of the liner. The second rotation restricting portion has a fitting protrusion (72) that fits into the fitting recess. The fitting recess and the fitting protrusion may have a polygonal outer shape when viewed from the axial direction of the liner.

[0058] In the above high-pressure gas tank, the first member and the second member may sandwich the liner in the axial direction of the liner by screw connection.

[0059] In the above high-pressure gas tank, the liner has a dome portion (26) whose diameter decreases toward the outside in the axial direction of the liner, and an annular concave wall portion (28) that is recessed from the diameter-reduced end portion of the dome portion toward the inside in the axial direction of the liner and has the end opening formed at the center. The annular concave wall portion includes an annular inclined portion (30) extending so as to be inclined toward the inside in the axial direction of the liner from the diameter-reduced end portion of the dome portion toward the inside in the radial direction of the liner, an annular connecting portion (32) extending from the extended end portion of the annular inclined portion toward the inside in the radial direction of the liner, and a cylindrical convex portion (34) protruding from the extended end portion of the annular connecting portion toward the outside in the axial direction of the liner. The second rotation restricting portion may be formed so as to straddle the cylindrical convex portion and the annular connecting portion.

[0060] The above-described embodiment is a method for manufacturing a high-pressure gas tank including a liner formed by axially joining a plurality of resin-made divided liners and having a gas filling chamber formed therein. The method includes: a preparation step of preparing an end divided liner (22) having an end opening in the axial direction of the liner to which a base is to be attached among the plurality of divided liners; a base attachment step of disposing a first member forming the base on the inner surface side of the end divided liner and disposing a second member forming the base on the outer surface side of the end divided liner, and connecting the first member and the second member to each other; a joining step of forming the liner by joining and integrating the plurality of divided liners; and a reinforcing layer forming step of forming a reinforcing layer by applying a rotational force centered on the axis of the liner to the base and winding a plurality of fibers around the outer surface of the liner while rotating the liner. In the base attachment step, a second rotation restricting portion provided on the first member is fitted into a first rotation restricting portion provided on the inner surface of the end divided liner so that rotation of the base with respect to the liner centered on the axis of the liner is restricted.

[0061] In the above-described method for manufacturing a high-pressure gas tank, in the base attachment step, the second member may be screwed to the first member to sandwich the liner between the first member and the second member in the axial direction of the liner.

Explanation of Reference Numerals

[0062] 10... High-pressure gas tank 12... Filling chamber 14... Liner 15... Divided liner 16... Reinforcing layer 17... Inner surface 18, 74... Base 20... End opening 22... End divided liner 26... Dome portion 28... Annular concave wall portion 30... Annular inclined portion 32... Annular connection portion 34... Annular convex portion 36... Fiber 38... Supply / discharge hole 40... First member 42, 76... Second member 44... Cylindrical portion 56... Rotation restricting structure 58…First rotation restricting section 60…Second rotation restricting section 62, 70…Fitting concave portions 64, 72…Fitting convex portions

Claims

1. A liner in which a plurality of resin-made divided liners are joined in the axial direction and a gas filling chamber is formed inside, A reinforcing layer formed by winding a plurality of fibers around the outer surface of the liner, A base provided at an end opening in the axial direction of the liner and having a supply / discharge hole formed for supplying and discharging gas to / from the filling chamber, A high-pressure gas tank comprising a rotation restricting structure for restricting rotation of the base with respect to the liner about the axis of the liner, The base, A first member located on the inner surface side of the liner, A second member located on the outer surface side of the liner and connected to the first member, The rotation restricting structure, A first rotation restricting portion provided on the inner surface of the liner, A second rotation restricting portion provided on the first member so as to fit into the first rotation restricting portion, The first member has a cylindrical portion inserted into the end opening of the liner, The first rotation restricting portion has a fitting recess provided in a portion of the inner surface of the liner adjacent to the end opening, The second rotation restricting portion has a fitting projection provided in a portion of the cylindrical portion located on the inner surface side of the liner and fitting into the fitting recess, The liner, A dome portion whose diameter decreases toward the outside in the axial direction of the liner, An annular concave wall portion that depresses inward in the axial direction of the liner from the diameter-reduced end of the dome portion and has the end opening formed at the center, The annular concave wall portion, An annular inclined portion extending so as to be inclined inward in the axial direction of the liner from the diameter-reduced end of the dome portion toward the inside in the radial direction of the liner, An annular connecting portion extending inward in the radial direction of the liner from the extending end of the annular inclined portion, A cylindrical convex portion protruding outward in the axial direction of the liner from the extending end of the annular connecting portion, The second rotation restricting portion is formed so as to straddle the cylindrical convex portion and the annular connecting portion. A high-pressure gas tank.

2. The high-pressure gas tank according to claim 1, The cylindrical portion is formed in a cylindrical shape, The fitting recess extends radially outward from the end opening, The fitting projection protrudes radially outward from the cylindrical portion so as to be inserted into the fitting recess, A plurality of the fitting recesses and the fitting projections are provided in the circumferential direction of the cylindrical portion. A high-pressure gas tank.

3. The high-pressure gas tank according to claim 1, A high-pressure gas tank in which the fitting concave portion and the fitting convex portion have a polygonal outer shape when viewed from the axial direction of the liner.

4. The high-pressure gas tank according to any one of claims 1 to 3, wherein the first member and the second member sandwich the liner in the axial direction of the liner by screw connection.

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