High-pressure tank liner, its manufacturing method, and high-pressure tank

Abstract

To provide a high-pressure tank liner for suppressing a float and a variation of reinforcing fibers of a fiber-reinforced resin layer which is arranged outside the high-pressure tank liner, a manufacturing method thereof, and a high-pressure tank.SOLUTION: A high-pressure tank liner 2 has: a flank part 5 composed of a cylinder body; a diameter-expanded part 9 formed at the flank part 5, and composed of a cylinder body which is expanded in diameter more than an outside diameter of a general part 8 of the flank part 5; and a stair part 12 formed at a step part 11 between the general part 8 of the flank part 5 and the diameter-expanded part 9, and composed of a plurality of steps. A distance D reaching a peripheral face 8a of the general part 8 from an angular part 15 of the step part 11 on the diameter-expanded part 9 side through the angular part 15 of each step 13 constituting the stair part 12 is shorter than a lateral width W of a fiber-reinforced roving 7 which is arranged so as to be extended in a circumferential direction of the flank part 5.SELECTED DRAWING: Figure 4A

Description

[Technical field]

[0001] The present invention relates to a high-pressure tank liner, a manufacturing method thereof, and a high-pressure tank. [Background technology]

[0002] Conventionally, as a so-called high-pressure tank for filling with high-pressure gas, there is known one in which a fiber-reinforced resin layer is formed on the outside of a cylindrical liner (high-pressure tank liner) made of synthetic resin (see, for example, Patent Document 1). This liner is formed by welding together cylindrical halves. The welded portion between the halves has a cylindrical shape with a larger diameter than the outer diameter of the general portion of the body of the liner. As a result, a step is formed on the outer peripheral surface of the liner between the general portion and the welded portion. [Prior art documents] [Patent documents]

[0003] International Publication No. 2019 / 131737 Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional high-pressure tank (see Patent Document 1), when a fiber-reinforced resin layer is formed on the outside of the liner, a roving made of reinforcing fibers is wound around the liner under a certain tension. However, the roving wound around the stepped portion of the liner may cause lifting on the general portion of the liner or cause variations in the strands that form the roving.

[0005] An object of the present invention is to provide a high-pressure tank liner that suppresses lifting and variation of the reinforcing fibers in a fiber-reinforced resin layer provided on the outside of the high-pressure tank liner, a manufacturing method thereof, and a high-pressure tank. [Means for solving the problem]

[0006] The high-pressure tank liner of the present invention, which solves the above-mentioned problems, comprises a body portion consisting of a cylindrical body, an expanded diameter portion consisting of a cylindrical body formed on the body portion and having a diameter larger than the outer diameter of the general portion of the body portion, and a step portion consisting of multiple steps formed in a step portion between the general portion of the body portion and the expanded diameter portion, and is characterized in that the distance from a corner of the step portion on the expanded diameter portion side, passing through the corners of each step that constitutes the step portion, to the peripheral surface of the general portion is shorter than the width of a roving of reinforcing fibers arranged to extend circumferentially of the body portion.

[0007] In addition, the manufacturing method of the high-pressure tank liner of the present invention, which solves the above-mentioned problem, comprises the steps of: joining the flange portions of a pair of liner halves, each having a cylindrical body portion and a flange portion formed at an opening on one end side of the body portion; cutting the joint portion between the flange portions of the liner halves in the circumferential direction of the cylinder to form an expanded diameter portion made of a cylinder having a diameter larger than the outer diameter of the general portion of the body portion; and cutting a step portion formed between the general portion and the expanded diameter portion of the body portion to form a staircase portion consisting of multiple steps, wherein in the step forming step, the step portion is cut so that the distance from a corner of the expanded diameter portion side of the step portion, passing through corners of each step constituting the staircase portion, to the peripheral surface of the general portion is shorter than the width of a roving of reinforcing fibers arranged to extend in the circumferential direction of the body portion.

[0008] In addition, a high-pressure tank that solves the above problem comprises a high-pressure tank liner having a body portion consisting of a cylindrical body, an expanded diameter portion consisting of a cylindrical body formed on the body portion and having a diameter larger than the outer diameter of a general portion of the body portion, and a step portion consisting of multiple steps formed in a step portion between the general portion of the body portion and the expanded diameter portion, and a fiber reinforced resin layer arranged to cover the outside of the high-pressure tank liner, wherein a roving of reinforcing fibers that constitutes the fiber reinforced resin layer is arranged to wind around the axis of the high-pressure tank liner around the outer circumferential surface of the high-pressure tank liner, and is wider than the distance from a corner of the expanded diameter portion side of the step portion in the high-pressure tank liner, passing through corners of each step that constitutes the step portion, to the circumferential surface of the general portion. Effect of the Invention

[0009] According to the present invention, it is possible to provide a high-pressure tank liner, a manufacturing method thereof, and a high-pressure tank that suppresses floating and variation of the reinforcing fibers that make up a fiber-reinforced resin layer when forming the fiber-reinforced resin layer on the outside of the high-pressure tank liner. [Brief description of the drawings]

[0010] [Figure 1] 1 is a vertical cross-sectional view of a high-pressure tank according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a partially enlarged cross-sectional view of a portion II in FIG. [Figure 3A] 1 is a longitudinal cross-sectional view of a pair of liner halves used in a manufacturing method for a high-pressure tank liner according to an embodiment of the present invention. FIG. [Figure 3B] FIG. 3B is a partially enlarged cross-sectional view of part IIIb in FIG. 3A. [Figure 3C] 3B is a partially enlarged cross-sectional view of a joint portion where a pair of liner halves shown in FIG. 3A are joined by welding. [Figure 3D] 3D is a partially enlarged cross-sectional view of an expanded diameter portion of the liner 2 formed by performing cutting processing on the joint portion of FIG. 3C. FIG. [Figure 3E] FIG. 3E is a process explanatory diagram for performing step machining on the enlarged diameter portion shown in FIG. 3D. [Figure 4A] FIG. 2 is a partially enlarged cross-sectional view showing a schematic view of a roving wound around a stepped portion of a high-pressure tank liner according to an embodiment of the present invention. [Figure 4B] FIG. 4 is a partially enlarged cross-sectional view showing a schematic view of a roving wound around a stepped portion of a high-pressure tank liner according to a first comparative example. [Figure 4C] FIG. 11 is a partially enlarged cross-sectional view showing a schematic view of a roving wound around a step portion of a high-pressure tank liner according to a second comparative example. [Figure 5A] FIG. 4 is a partially enlarged cross-sectional view of a high-pressure tank liner according to a first modified example. [Figure 5B] FIG. 11 is a configuration explanatory diagram of a high-pressure tank liner according to a second modified example. [Figure 5C]FIG. 11 is a partially enlarged cross-sectional view of a high-pressure tank liner according to a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Next, a mode (embodiment) for carrying out the present invention will be described in detail with reference to the drawings as appropriate. First, the high-pressure tank of this embodiment and the high-pressure tank liner used in this high-pressure tank will be described.

[0012] <High-pressure tank> FIG. 1 is a vertical cross-sectional view of a high-pressure tank 1 according to an embodiment of the present invention. The high-pressure tank 1 of this embodiment is assumed to be mounted on, for example, a fuel cell vehicle and store hydrogen gas to be supplied to a fuel cell system. However, the high-pressure tank 1 is not limited to this and may be used for other high-pressure gases.

[0013] As shown in FIG. 1, the high-pressure tank 1 comprises a high-pressure tank liner 2 (hereinafter, simply referred to as the "liner 2"), which will be described in detail later, a nozzle 3 connected to the liner 2, and a fiber-reinforced resin layer 4 covering the outside of the liner 2 to the nozzle 3.

[0014] The base 3 is assumed to be made of a metal material such as an aluminum alloy. The base 3 has a cylindrical base body 18 having a supply and drainage hole 21 on the inside, and a flange portion 19 formed on one axial end of the base body 18. The supply and drainage hole 21 communicates with the inside of the high-pressure tank 1 at the end where the flange portion 19 is formed. The other end of the supply and drainage hole 21 is connected to a pipe (not shown) that communicates with the fuel cell system or the like.

[0015] A threaded portion 21a that meshes with a threaded portion 17a formed on the cylindrical portion 17 of the liner 2, which will be described later, is formed on the inner peripheral surface of the supply and drainage hole 21 at one end of the nozzle body 18. An O-ring (not shown) is attached between the tip end of the cylindrical portion 17 of the liner 2 and the inner peripheral surface of the supply and drainage hole 21.

[0016] A cylindrical collar 22 made of a metal material is disposed inside the supply and drainage hole 21. The collar 22 extends from one end supported by the inner circumferential surface of the supply and drainage hole 21 toward the liner 2 and is fitted into the cylindrical portion 17 of the liner 2.

[0017] In this embodiment, the fiber-reinforced resin layer 4 is assumed to be obtained by winding a prepreg, in which reinforcing fibers have been previously impregnated with a matrix resin, around the outer peripheral surfaces of the liner 2 and the nozzle 3, and then hardening the matrix resin.

[0018] In this embodiment, the reinforcing fibers are assumed to be belt-shaped rovings 7 (see FIG. 2) formed by bundling together a plurality of strands each made of a plurality of carbon fiber filaments. However, the reinforcing fibers are not limited to these, and for example, aramid fibers, boron fibers, alumina fibers, silicon carbide fibers, etc. may also be used.

[0019] The matrix resin in this embodiment is assumed to be, for example, a cured product of a thermosetting resin such as an epoxy resin, a phenol resin, an unsaturated polyester resin, or a polyimide resin. The method for forming the fiber reinforced resin layer 4 is not limited to the above-mentioned method using prepregs. Therefore, the fiber reinforced resin layer 4 may be formed, for example, by impregnating unresined reinforcing fibers wound around the liner 2 with a matrix resin and curing the impregnated fibers.

[0020] <High pressure tank liner> The liner 2 is a hollow body made of a thermoplastic resin. Examples of the thermoplastic resin include, but are not limited to, polyamide resin and polyethylene resin. The liner 2 of this embodiment includes a cylindrical body 5 and head portions 6 that are integrally formed on both ends of the body 5. The body portion 5 is configured to include a general portion 8 that is formed with a predetermined outer diameter and occupies most of the axial (Ax) direction of the body portion 5, and an expanded diameter portion 9 that is formed in the center of the body portion 5 in the axial (Ax) direction and has a larger diameter than the general portion 8.

[0021] The expanded diameter portion 9 is formed by cutting a joint 36 (see Figure 3C) which joins the ends of a pair of liner halves 31 (see Figure 3A) by welding, as will be explained in detail in the "Manufacturing method of a high-pressure tank liner" described later.

[0022] FIG. 2 is a partially enlarged cross-sectional view of a portion II in FIG. 2, a step portion 11 formed between the general portion 8 and the expanded diameter portion 9 of the body portion 5 has a staircase portion 12 made up of multiple steps formed from the general portion 8 side toward the expanded diameter portion 9 side. Incidentally, although the number of steps of the staircase portion 12 in this embodiment is two, as described later, the number of steps of the staircase portion 12 can also be three or more.

[0023] Furthermore, in such a staircase portion 12, of the multiple steps 13 that constitute this staircase portion 12, the rising surfaces 14 of the other steps 13b, except for the first step 13a that is formed closest to the general portion 8, are inclined surfaces. In this embodiment, the rising surface 14 corresponds to a surface portion corresponding to a riser portion rising from a so-called tread surface in a staircase structure in which the general portion 8 is the lower floor and the enlarged diameter portion 9 is the upper floor. The rising surface 14 in this embodiment is inclined so as to gradually move away from the axis of the cylinder (see symbol Ax in FIG. 1) from the general portion 8 side toward the enlarged diameter portion 9 side. In FIG. 2, reference numeral 4 denotes a fiber-reinforced resin layer, and reference numeral 7 denotes a roving extending in the circumferential direction of the body portion 5 on the stepped portion 12 and shown in its cross section.

[0024] As shown in Figure 2, the stepped portion 12 is formed so that the distance D from the corner 15 on the enlarged diameter portion 9 side of the step portion 11, through the corner 15 of the step portion 13 formed between the enlarged diameter portion 9 and the general portion 8, to the peripheral surface 8a of the general portion 8 is shorter than the width W of the roving 7.

[0025] As shown in FIG. 1, the head portion 6 is a flattened, bowl-shaped body that gradually decreases in diameter as it moves away from the body portion 5 side toward the outside in the axial (Ax) direction. The head portion 6 has a recess 16 in the radial center that is recessed to correspond to the shape of the flange portion 19 of the base 3 . Further, the cylindrical portion 17 is formed in the center of the recess 16 so as to protrude toward the supply and drainage hole 21 of the nozzle 3. The threaded portion 17a which meshes with the threaded portion 21a of the supply and drainage hole 21 is formed on the outer circumferential surface of the cylindrical portion 17.

[0026] <Manufacturing method for high-pressure tank liners> Next, a method for manufacturing the liner 2 (see FIG. 1) will be described. Fig. 3A is a longitudinal cross-sectional view of a pair of liner halves 31 used in the manufacturing method of the liner 2 (see Fig. 1) according to this embodiment. Fig. 3B is a partially enlarged cross-sectional view of part IIIb of Fig. 3A. Fig. 3C is a partially enlarged cross-sectional view of a joint 36 at which the pair of liner halves 31 shown in Fig. 3A are joined by welding. Fig. 3D is a partially enlarged cross-sectional view of an expanded diameter portion 6 of the liner 2 formed by cutting the joint 36 in Fig. 3C. Fig. 3E is a process explanatory diagram for performing step machining on the expanded diameter portion 6 shown in Fig. 3D.

[0027] The manufacturing method of the liner 2 (see Figure 1) of this embodiment, as shown in Figures 3A to 3E, is mainly composed of a preparation process of the liner halves 31, a joining process of joining the liner halves 31 together by welding, and a cutting process of cutting the joints 36 between the integrated liner halves 31.

[0028] As shown in FIG. 3A, in the preparation step, a pair of liner halves 31 are prepared. The liner half 31 has substantially the same shape as the liner 2 shown in FIG. 1 obtained by dividing it into two at the axial center, except that it has a flange portion 32 which will be described next. Such a liner half 31 can be formed by injection molding or blow molding.

[0029] As shown in FIG. 3B, on the sides of the openings 33 where the liner halves 31 face each other, a flange portion 32 and a protruding end portion 34 having a melting margin 35, which will be described in detail later, are formed. The flange portion 32 is an annular body coaxial with the body portion 5 and integrally formed with the body portion 5 so as to protrude radially outward from the body portion 5 of the liner half body 31 . The flange portion 32 is formed with a circumferential groove 32a.

[0030] This circumferential groove 32a is formed to extend in the circumferential direction on a flange surface portion 32b rising from the peripheral surface of the body portion 5 of the liner half body 31. In other words, the circumferential groove 32a is formed on the flange surface portion 32b farther away from the opening 33 of the liner half body 31 out of a pair of flange surface portions 32b formed to be aligned in the axial direction of the liner half body 31. A pressing jig (not shown) is fitted into the circumferential groove 32a. Then, as shown in Fig. 3A, the pressing jig presses the liner halves 31 arranged so that their openings 33 face each other with a predetermined load.

[0031] As shown in FIG. 3B, the protruding end portion 34 is an annular body coaxial with the body portion 5 and integrally formed with the end surface of the liner half body 31 on the opening 33 side. The outer diameter of the protruding end 34 is set to be larger than the outer diameter of the body portion 5 in the liner half body 31 and smaller than the outer diameter of the flange portion 32 . The inside diameter of the protruding end 34 is set to be the same as the inside diameter of the liner half 31 . The thickness of the protruding end portion 34 of the liner half body 31 in the axial direction Ax is greater than a melting allowance 35 when the liner half bodies 31 are welded together, which will be described later.

[0032] Next, in the process of joining the liner halves 31 together, the melting portions 35 of the protruding ends 34 shown in FIG. 3B are heated and melted to join the liner halves 31 together. In this embodiment, methods of melting the melting margin 35 include heating the protruding end 34 with a heater and utilizing frictional heat between the liner halves 31. Incidentally, frictional heat between the liner halves 31 can be generated by pressing the liner halves 31 together with a predetermined load using the pressing jig (not shown) and causing relative displacement by vibration or the like.

[0033] In this joining process, as shown in Fig. 3C, a pressing jig (not shown) presses the liner halves 31 against each other with a predetermined load, causing the molten material 35a of the melting margin 35 (see Fig. 3B) to flow in a direction intersecting the pressing direction (axis Ax direction) of the liner halves 31 against each other. As a result, the molten material 35a of the liner halves 31 melt together at the welding surfaces 36a shown by the imaginary lines (two-dot chain lines). Then, as the molten material 35a cools, the liner halves 31 are integrated and connected together at the welding surfaces 36a.

[0034] Next, in a cutting process for cutting the integrated liner halves 31 together, as shown in FIG. 3D, the flange portion 32 (indicated by an imaginary line (two-dot chain line)) at the joint 36 is removed by cutting, leaving behind its base portion 32c. The expanded diameter portion 9 of the liner 2 is formed at the remaining root portion 32c.

[0035] In this cutting process, as shown in Fig. 3E, a step portion 11 formed between the general portion 8 and the expanded diameter portion 9 of the body portion 5 is cut to form a stepped portion 12 consisting of multiple steps. Specifically, as shown in the upper diagram of Fig. 3E, a rotating tool having a truncated cone-shaped cutting tool head 37 approaches the step portion 11 along the axial direction Ax of the body portion 5.

[0036] Then, the cutting tool head 37 starts cutting the step portion 11 as shown in the middle diagram of Fig. 3E. At this time, the height of the first step 13a in the staircase portion 12 is determined by the distance of the cutting tool head 37 from the general portion 8 of the trunk portion 5.

[0037] Next, as shown in the lower diagram of Figure 3E, the cutting tool head 37 continues cutting further to form a multi-step staircase portion 12 consisting of a first step portion 13a and a step portion 13b having an inclined rising surface 14.

[0038] As shown in FIG. 2, the high-pressure tank 1 is manufactured by winding a reinforcing fiber roving 7 around the body 5 of the liner 2, which includes such a stepped portion 12. As described above, the distance D of the stepped portion 12 is shorter than the width W of the roving 7. Then, such a stepped portion 12 is formed in the expanded diameter portion 9, completing a series of manufacturing steps for the liner 2 (see FIG. 1) of this embodiment.

[0039] <Action and effect> Next, the effects of the high-pressure tank liner 2 and its manufacturing method, as well as the high-pressure tank 1 of this embodiment, will be described. Fig. 4A is a partially enlarged cross-sectional view showing a schematic view of the roving 7 as a reinforcing fiber wound around the stepped portion 12 of the liner 2 according to the embodiment. Fig. 4B is a partially enlarged cross-sectional view showing a schematic view of the roving 7 as a reinforcing fiber wound around the stepped portion 11 of the liner 40a according to the first comparative example. Fig. 4C is a partially enlarged cross-sectional view showing a schematic view of the roving 7 as a reinforcing fiber wound around the stepped portion 11 of the liner 40b according to the second comparative example.

[0040] Here, a liner 40a according to a first comparative example and a liner 40b according to a second comparative example will be described first. As shown in FIG. 4B, the liner 40a of the first comparative example is formed in the same manner as the liner 2 of this embodiment, except that the step portion 12 (FIG. 4A) consisting of multiple steps is not formed in the step portion 11 between the general portion 8 and the expanded diameter portion 9.

[0041] When the roving 7 is wound around the stepped portion 11 of the liner 40a, the roving 7 generates a floating L on the general portion 8 side of the liner 40a. In addition, in the liner 40a, when the roving 7 with a predetermined tension is wound around the stepped portion 11, the corners 15 of the enlarged diameter portion 9 may get between the strands (not shown) that form the roving 7, causing the strands to vary.

[0042] Also, as shown in FIG. 4C, the liner 40b of the second comparative example is configured such that a chamfered portion 15a (surface C) is formed in a portion corresponding to the corner portion 15 (see FIG. 4B) of the liner 40a of the first comparative example (see FIG. 4B).

[0043] When the roving 7 is wound around the step portion 11 of such a liner 40b, as with the liner 40a (see Figure 4B) of the first comparative example, a floating L will occur in the roving 7 on the general portion 8 side of the liner 40b, and it is also possible that the corners 15 of the step portion 11 will cause variation in the strands (not shown).

[0044] Incidentally, in conventional liners (see, for example, Patent Document 1), the welding surface 36a (see FIG. 3C) is often meandering due to processing errors. Therefore, of the step portions 11 formed at both ends of the enlarged diameter portion 9 in the axial Ax direction, one end side is formed with a chamfered portion 15a (see FIG. 4B), and the other is formed as a corner portion 15 (see FIG. 4B) with the step portion 11 left as it is.

[0045] In contrast, in the liner 2 of this embodiment, the distance D of a stepped portion 12 consisting of a plurality of steps is shorter than the width W of the roving 7, as shown in FIG. 4A. According to such a liner 2, the roving 7 under a predetermined tension on the stepped portion 12 is supported at three points: the corner 15 on the expanded diameter portion 9 side, the peripheral surface 8a of the general portion 8, and the corner 15 of the first step 13a that constitutes the stepped portion 12. As a result, the reaction force that the tensioned roving 7 receives from the liner 2 side is distributed to these three points, suppressing the dispersion of the strands (not shown). In addition, with such a liner 2, a stepped portion 12 consisting of multiple steps is formed in the expanded diameter portion 9, thereby reducing the floating L of the roving 7 at the step between the general portion 8 and the expanded diameter portion 9 of the liner 2.

[0046] In addition, in the liner 2 of this embodiment, the rising surface 14 is an inclined surface, so that the corners 15 of the steps 13b other than the first step 13a are obtuse angles, and the wedge effect of the corners 15 entering between the strands (not shown) forming the roving 7 is reduced compared to the liner 40a (see FIG. 4B) according to the first comparative example. This makes it possible to more reliably suppress the variation of the strands (not shown). Moreover, since the liner 2 of this embodiment has an inclined rising surface 14, the floating L of the roving 7 with respect to the liner 2 at the step portion 11 is further reduced.

[0047] Although the present embodiment has been described above, the present invention is not limited to the above embodiment and can be embodied in various forms. In the above embodiment, the liner 2 having the stepped portion 12 with two steps and the high-pressure tank 1 having this liner 2 are exemplified (see FIG. 2). However, the number of steps of the stepped portion 12 of the liner 2 is not limited to this and may be three or more. FIG. 5A is a partially enlarged cross-sectional view of the liner 2 according to the first modified example. As shown in FIG. 5A, the liner 2 according to the first modified example is formed in the same manner as the liner 2 (see FIG. 1) of the above embodiment, except that the number of steps of the stepped portion 12 is three. According to the liner 2 of the first modified example, the support points of the roving 7 (see Figure 2) relative to the liner 2 are further increased in accordance with the number of stages, thereby further suppressing the floating L (see Figure 4A) of the roving 7 (see Figure 4A) relative to the liner 2 and the variation in the strands.

[0048] Fig. 5B is a structural explanatory diagram of the liner 2 according to the second modified example. Fig. 5B is a development diagram showing the cross section and the circumferential surface of the liner 2 on the same plane. Note that the size and shape of the waviness Ud shown in Fig. 5B are exaggerated for the convenience of explaining this modified example, and are different from the actual size and shape. As shown in FIG. 5B, the stepped portions 12 of the liner 2 according to the second modified example are alternately formed on one end side and the other end side of the expanded diameter portion 9 in the axial Ax direction along the circumferential direction Cd of the expanded diameter portion 9. In Fig. 5B, the symbol Ud denotes a ripple formed at one end and the other end of the expanded diameter portion 9 in the axial Ax direction by the meandering of the welding surface 36a. That is, the ripple Ud is formed by the expanded diameter portion 9 meandering along the circumferential direction Cd of the expanded diameter portion 9. At one end and the other end of the expanded diameter portion 9 in the axial Ax direction, portions where the first step portion 13a is formed and portions where it is not formed appear alternately according to the period of the ripple Ud. As a result, in the liner 2 according to the second modified example, the stepped portions 12 are formed alternately along the circumferential direction Cd. According to the liner 2 of the second modified example, the step portion 12 formed on one end or the other end of the expanded diameter portion 9 makes it possible to suppress the floating L (see Figure 4A) of the roving 7 (see Figure 4A) and the variation of the strands (not shown).

[0049] In the above embodiment, the stepped portion 12 of the liner 2 is formed at both ends of the cylindrical body of the expanded diameter portion 9 in the axial direction Ax (see FIG. 2). The stepped portion 12 of the liner 2 may be formed at least on one end side of the cylindrical body of the expanded diameter portion 9 in the axial direction. FIG. 5C is a partially enlarged cross-sectional view of the liner 2 according to the third modified example. 5C, in the liner 2 according to the third modification, the stepped portion 12 is formed only on one end side in the axial direction Ax of the cylindrical body of the expanded diameter portion 9. In addition, a chamfered portion 15a (surface C) is formed on the other end side of the expanded diameter portion 9. According to the liner 2 of the third modified example, the stepped portion 12 formed on one end side can suppress the floating L (see FIG. 4A) of the roving 7 (see FIG. 4A) and the variation of the strands (not shown). In addition, the chamfered portion 15a (C surface) formed on the other end side reduces the load on the filament (not shown). [Explanation of symbols]

[0050] 1. High pressure tank 2 High Pressure Tank Liner 4 Fiber-reinforced resin layer 5. Torso 7. Roving 8 General section of the torso 8a General area periphery 9 Enlarged diameter of the body 11 Step 12 Stairs 13 Step section 13a First step 13b Other steps 14 Step surface 15 Corner 31 Liner half 32 Flange part of liner half 33 Opening of liner half 36 Joint between flanges Ax High pressure tank liner axis D Distance W Roving width

Claims

1. A cylindrical body portion; an expanded diameter portion formed in the body portion and having a cylindrical body with a diameter larger than an outer diameter of a general portion of the body portion; A step portion having a plurality of steps formed in a step portion between the general portion and the expanded diameter portion of the body portion; It has A high-pressure tank liner characterized in that the distance from a corner of the step portion on the expanded diameter side, through the corners of each step that constitutes the staircase portion, to the peripheral surface of the general portion is shorter than the width of a reinforcing fiber roving arranged to extend circumferentially of the body portion.

2. 2. The high-pressure tank liner according to claim 1, wherein the stepped portion is formed on at least one end side of the enlarged diameter portion in the axial direction of the cylindrical body.

3. 2. The high-pressure tank liner according to claim 1, wherein the step portions are alternately formed on one end side and the other end side of the enlarged diameter portion in the axial direction of the cylindrical body of the enlarged diameter portion along the circumferential direction of the enlarged diameter portion.

4. 4. The high-pressure tank liner according to claim 1, wherein, of the multiple steps constituting the staircase portion, except for a first step formed closest to the general portion, the other steps have a rising surface that rises in a direction away from the axis of the cylindrical body and is formed as an inclined surface that gradually rises away from the axis of the cylindrical body as it moves from the general portion side to the expanded diameter portion side.

5. a step of joining together flange portions of a pair of liner halves each having a cylindrical body portion and a flange portion formed at an opening on one end side of the body portion; a step of cutting a joint between the flange portions of the liner half bodies in a circumferential direction of a cylindrical body to form an expanded diameter portion having a diameter larger than an outer diameter of a general portion of the body portion; a step of cutting a step portion formed between the general portion and the expanded diameter portion of the body portion to form a step portion having a plurality of steps; having a step of forming the stepped portion such that the distance from a corner of the stepped portion on the expanded diameter side, through the corners of each step that constitutes the stepped portion, to the peripheral surface of the general portion is shorter than the width of a reinforcing fiber roving arranged to extend circumferentially of the body portion.

6. a high-pressure tank liner having a body portion made of a cylindrical body, an expanded diameter portion formed on the body portion and made of a cylindrical body with a diameter larger than an outer diameter of a general portion of the body portion, and a step portion consisting of multiple steps formed in a step portion between the general portion of the body portion and the expanded diameter portion; A fiber reinforced resin layer disposed so as to cover the outside of the high pressure tank liner; Equipped with a roving of reinforcing fibers constituting the fiber-reinforced resin layer is arranged so as to wind around the outer peripheral surface of the high-pressure tank liner around the axis of the high-pressure tank liner, and is wider than the distance from a corner of the stepped portion of the high-pressure tank liner on the side of the expanded diameter portion, through the corners of each step constituting the staircase portion, to the peripheral surface of the general portion.

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