JP5549247B2 - Manufacturing method for assembly of hydrogen filling hose and hose fittings - Google Patents

Description

  The present invention relates to a method of manufacturing an assembly product of a hydrogen filling hose and a hose fitting, and more specifically, while suppressing deformation of the nipple, the hose fitting is firmly fixed to the hydrogen filling hose to provide sealing performance and durability. The present invention relates to a method for manufacturing an assembly product of a hydrogen filling hose and a hose fitting that can improve the performance.

  In recent years, development of fuel cell vehicles and the like has been actively conducted. Along with this, development of a hose that fills hydrogen gas from a hydrogen station to a fuel cell vehicle or the like is also underway. This hydrogen filling hose is required to have excellent hydrogen gas permeability. Further, in order to increase the travel distance of a fuel cell vehicle or the like, it is necessary to fill the fuel tank with hydrogen gas at a high pressure. Therefore, the hydrogen filling hose has a practicality capable of withstanding a high internal pressure of about 70 to 84 MPa. is necessary. In order to improve the pressure resistance of the hose, it is a general technique to reinforce the reinforcing layer, but it is difficult to adopt a metal reinforcing layer due to the problem of hydrogen embrittlement. There is a restriction that it must be used. As an organic fiber-based reinforcing layer, a blade structure or a spiral structure of polyparaphenylene benzbisoxazole (PBO) fiber has been proposed (see Patent Document 1).

  A hose fitting made of a nipple and a socket is attached to the end of the hose. When attaching a hose fitting to a hose, generally hold the end of the hose between the nipple and the socket, pressurize the outer peripheral surface of the socket, deform the socket to reduce its diameter, and crimp it. (See Patent Document 2). Since the hydrogen filling hose as described above is required to have high pressure resistance, it is necessary to appropriately improve the metal fitting resistance (sealability). Therefore, when the socket is crimped on all sides using the die described in FIG. 7 of Patent Document 2, it is necessary to crimp the socket very strongly, and the nipple is easily deformed. In addition, since a part of the hose where the socket is crimped moves (escapes) to both sides in the longitudinal direction of the hose, it is difficult to sufficiently improve the sealing performance between the hose and the hose fitting. If this sealing property is insufficient, the hose near the root of the hose fitting (so-called cover bulge) tends to occur over time, and the durability is lowered.

  When swage swaging is performed using the die described in FIG. 6 of Patent Document 2, most of the volume is reduced without moving a part of the socket swung portion to the opposite end side of the hose. It can be moved to the end side of the hose. Therefore, even if it is small caulking force compared with eight-side caulking, the sealing performance of the hose and the hose fitting can be improved. However, in FIG. 8 of Patent Document 2, the inner peripheral surface of the socket is linearly formed in the hose axial direction along the outer peripheral surface of the hose. Therefore, the nipple is excessively pressurized by the volume of the hose moved to the end portion side of the hose when the socket is caulked, and is easily deformed. In the hydrogen filling hose, a thermoplastic resin having excellent hydrogen gas permeability is used for the inner layer, so that the inner layer is harder than a normal rubber hose. Therefore, the external force acting on the nipple when caulking the socket is increased, and the nipple is more easily deformed.

  In addition, in the structure shown in FIG. 8, the volume of the hose is moved toward the end of the hose when the socket is crimped due to insufficient space between the outer peripheral surface of the nipple and the inner peripheral surface of the socket at the end of the hose. In some cases, sufficient sealing performance cannot be obtained.

JP-A-6-300169 JP-A 63-47593

  An object of the present invention is to provide an assembly product of a hydrogen filling hose and a hose fitting that can improve the sealing performance and durability by firmly fixing the hose fitting to the hydrogen filling hose while suppressing deformation of the nipple. It is in providing the manufacturing method of.

In order to achieve the above object, the hydrogen filling hose and hose fitting assembly manufacturing method of the present invention includes a hydrogen filling hose and a hose fitting in which a hose fitting consisting of a nipple and a socket is attached to the end of the hydrogen filling hose. In the method of manufacturing an assembly product, the hydrogen filling hose has at least two reinforcing layers coaxially stacked between an inner surface layer and an outer surface layer that are coaxially stacked, and the inner surface layer is at 90 ° C. The gas permeability coefficient of dry hydrogen gas is 1 × 10 ⁻⁸ cc · cm / cm ² · sec. A blade structure in which the outer surface layer is made of a thermoplastic resin and each of the reinforcing layers is braided with polyparaphenylene benzbisoxazole fibers. The portion is sandwiched between the nipple and the socket, and the outer peripheral surface of the socket is pressurized in a continuous state in the circumferential direction, and this pressure is applied to the end portion from the opposite end side of the hydrogen filling hose. By moving toward the side, the socket is reduced in diameter and the annular protrusions provided on the inner peripheral surface of the socket are bitten into the hydrogen filling hose and crimped. On the end side of the hose, a bulging portion is formed by bulging the inner peripheral surface on the outer peripheral side of the annular groove between the annular projections, and the hydrogen filling hose is between the bulging portion and the nipple. In the state of being filled, and is characterized in attaching the hose fitting to the end of the hydrogen filling hose.

Here, the ratio D / B between the tip width B of the annular protrusion and the outer diameter D of the hydrogen filling hose is 6.0 to 11.0, and the ratio between the tip width B and the groove pitch P of the annular groove is A specification in which the ratio P / B is 2.5 to 6.0 can also be adopted. The ratio L / D of the outer diameter D of the hydrogen filling hose to the length L of the socket is 3.0 or more, and the ratio L1 / the length L1 of the socket length L to the length L1 of the portion where the socket is crimped It can also be set as the specification whose L is 0.6-0.8. The compression rate of the hydrogen filling hose at the position of the annular protrusion in the portion where the socket is crimped is, for example, 40% to 55%. Further, the braiding angle of the polyparaphenylene benzbisoxazole fiber is increased as the outer peripheral reinforcing layer, and the braiding angle in the innermost reinforcing layer is set to 43 ° or more and 51 ° or less, A specification in which the braid density coefficient K is set to 1.0 or more and 4.5 or less can also be adopted. The braid density coefficient K is calculated by the following equation (1).
K = (number of PBO fibers constituting reinforcing layer / 2) / (P1 × sinA) (1)
P1 is the braiding pitch of the PBO fibers constituting the reinforcing layer, and A is the braiding angle of the PBO fibers constituting the reinforcing layer.

  Here, when the number of laminated reinforcing layers is 3, the braid angle in the second reinforcing layer from the inner peripheral side is set to 48 ° to 53 °, and the braid angle in the outermost reinforcing layer is set to 53 °. Set between ° and 58 °. When the number of laminated reinforcing layers is two, the braid angle in the outermost reinforcing layer is set to 51 ° to 58 °.

  According to the present invention, when the hose fitting is attached to the end of the hydrogen filling hose having the above specifications, the end of the hose is sandwiched between the nipple and the socket, and the outer peripheral surface of the socket is surrounded. While applying pressure in a continuous state in the direction, this pressure is applied from the opposite end side of the hose toward the end side, and the socket is reduced in diameter and crimped. A part of the hose moves toward the end of the hose without escaping to the opposite end of the hose. And between the bulging part of the socket formed in the edge part side of a hose rather than the crimped part, and the nipple, it will be in the state with which the hose was filled with the high density by the part of the hose which moved. Therefore, the hose fitting is fixed by a hose filled with a high density between the bulging portion of the socket and the nipple in addition to the fixing force at the portion where the socket is crimped. Therefore, it is possible to firmly fix the hose fitting to the hose without suppressing the nipple with excessive force as compared with the conventional case, and to suppress the deformation of the nipple. Accordingly, the sealing performance and durability of the assembly of the hose and the hose fitting are improved.

  Furthermore, since the inner peripheral surface of the bulging portion bulges to the outer peripheral side with respect to the annular groove between the annular projections formed on the inner peripheral surface of the socket, a space for receiving the volume of the hose moved by caulking Is secured. Therefore, the nipple is not excessively pressurized by the volume of the hose that has moved, which is advantageous for suppressing deformation of the nipple.

It is a side view which illustrates a part of assembly product in a cross section. FIG. 2 is a side view in which the hydrogen filling hose of FIG. 1 is partially cut away. It is a perspective view explaining the braiding angle and braiding pitch of PBO fiber. It is a side view which illustrates a hose metal fitting and a part of hose before crimping in a section. It is explanatory drawing which illustrates the process which crimps a hose metal fitting by making a part of hose metal fitting and a hose into a cross section.

  Hereinafter, a method for producing an assembly product of a hydrogen filling hose and a hose fitting according to the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIG. 1, an assembly 1 manufactured according to the present invention includes a hydrogen filling hose 2 (hereinafter referred to as a hose 2) and a hose fitting 6. The hose fitting 6 includes a nipple 7 and a socket 8.

As illustrated in FIG. 2, the hose 2 has a specification in which at least two reinforcing layers 4 are coaxially laminated between an inner surface layer 3 and an outer surface layer 5 which are coaxially laminated. The inner surface layer 3 has a gas permeability coefficient of 1 × 10 ⁻⁸ cc · cm / cm ² · sec. A blade structure in which the outer layer 5 is made of a thermoplastic resin having a cmHg or less, the outer surface layer 5 is made of a thermoplastic resin, and each of the reinforcing layers 4 is braided with polyparaphenylene benzbisoxazole fibers f (hereinafter referred to as PBO fibers f). It has become. In this embodiment, the three reinforcing layers 4 of the first reinforcing layer 4a, the second reinforcing layer 4b, and the third reinforcing layer 4c are laminated in order from the inner peripheral side. A one-dot chain line CL in FIG. 2 indicates the hose axis.

  The gas permeability coefficient of the inner surface layer 3 is a value measured according to JIS K7126. Examples of the thermoplastic resin that forms the inner surface layer 3 include nylon, polyacetal, and ethylene vinyl alcohol copolymer. Thus, by using a resin having good hydrogen gas barrier properties, excellent hydrogen gas permeability can be obtained. The inner diameter of the inner surface layer 3 is, for example, about 4.5 mm to 12.0 mm, and the layer thickness is set to about 0.5 mm to 2.0 mm.

  Examples of the thermoplastic resin forming the outer surface layer 5 include polyurethane and polyester. The layer thickness of the outer surface layer 5 is set to about 0.2 mm to 1.0 mm, for example.

  In the reinforcement layer 4, the braiding angle of the PBO fiber f is larger as the reinforcement layer 4 on the outer peripheral side. In this embodiment, the braid angle A1 of the PBO fibers f in the first reinforcement layer 4a, the braid angle A2 of the PBO fibers f in the second reinforcement layer 4b, and the braid angle A3 of the PBO fibers f in the third reinforcement layer 4c are A1 < A2 <A3. And braiding angle A1 in the 1st reinforcement layer 4a is set to 43 degrees or more and 51 degrees or less.

  In each reinforcing layer 4, the braid density coefficient K of the PBO fiber f is set to 1.0 or more and 4.5 or less. The braid density coefficient K is calculated by the above equation (1). FIG. 3 shows the braiding angle A and the braiding pitch P1 of the PBO fiber f in more detail. A one-dot chain line CL in FIG. 3 is a hose axis.

  With this structure, the inner peripheral reinforcing layer 4 is more easily changed in the radial direction by the internal pressure, and the internal pressure is efficiently transmitted from the inner peripheral first reinforcing layer 4a to the outer peripheral third reinforcing layer 4c. be able to. Therefore, the specific reinforcing layer 4 does not overload the internal pressure, and the internal pressure is dispersed in all the reinforcing layers 4 so that a high reinforcing effect can be obtained. Therefore, the pressure resistance of the hose 2 can be greatly improved, and the pressure resistance required for the hydrogen filling hose (practicality at an internal pressure of about 70 to 84 MPa) can be cleared.

  In the present invention, the reinforcing layer 4 has two or more layers, and the outer reinforcing layer 4 has a larger braiding angle, and the braiding angle in the innermost first reinforcing layer 4a is 43 ° or more and 51 ° or less. It is desirable that the braid density coefficient K of each reinforcing layer 4 is set to 1.0 or more and 4.5 or less.

  When the braid angle A1 in the innermost first reinforcing layer 4a is less than 43 °, the amount of change in the radial direction due to the internal pressure becomes excessive, and when it exceeds 51 °, it becomes excessively small. Further, when the braid density coefficient of each reinforcing layer 4 is less than 1.0, the reinforcing effect is small, and when it exceeds 4.5, the flexibility is lowered and the internal pressure is difficult to be transmitted to all the reinforcing layers 4. . Therefore, it is preferable to set the braid angle A1 in the innermost first reinforcing layer 4a and the braid density coefficient K of each reinforcing layer 4 within the above ranges.

  When the reinforcing layer 4 has three layers, in order to efficiently transmit the internal pressure sequentially from the first reinforcing layer 4a on the inner peripheral side to the second reinforcing layer 4b and the third reinforcing layer 4c on the outer peripheral side, The braid angle A2 in the reinforcing layer 4b is set to 48 ° to 53 °, and the braid angle A3 in the third reinforcing layer 4c is set to 53 ° to 58 °. This is because it is difficult to disperse the internal pressure in each reinforcing layer 4 even if the difference in braid angle between the upper and lower adjacent reinforcing layers 4 is too small or too large.

  For the same reason, when the number of laminated reinforcing layers 4 is two, the braid angle in the inner peripheral side reinforcing layer 4 is set to 43 ° to 51 ° and the braid angle in the outer peripheral side reinforcing layer 4 is set. Is set to 51 ° or more and 58 ° or less.

  In the present invention, since the reinforcing layer 4 is formed of the PBO fiber f, the problem of hydrogen embrittlement can be avoided. Moreover, since it can endure the use internal pressure of about 70-84 MPa, sufficient practicality and safety | security which fill a fuel cell vehicle etc. with hydrogen gas from a hydrogen station can be ensured.

  The wire diameter of the PBO fiber f is, for example, about 0.1 mm to 0.3 mm. In this embodiment, the wire diameters of the PBO fibers f in all the reinforcing layers 4 are the same, but they can be different. For example, the diameter of the reinforcing layer 4 on the outer peripheral side can be increased.

  The layer thickness of each reinforcing layer 4 is set to about 0.2 mm to 1.5 mm, for example. In this embodiment, all the reinforcing layers 4 have the same layer thickness, but may have different layer thicknesses.

  A protective layer made of organic fibers can also be provided between the outermost third reinforcing layer 4 c and the outer surface layer 5. The protective layer may be constituted by braiding organic fibers or may be constituted by winding in a spiral shape. This cushioning property of the protective layer is advantageous in preventing damage and breakage since the reinforcing layer 4 is protected when the metal fitting is fastened to the hose 2. Examples of the organic fiber include an aramid fiber, a polyester fiber, and a nylon fiber.

  The nipple 7 is formed with a retaining projection 7b spaced from the hose axis CL in a portion where the hose 2 is fitted. The shape and number of the retaining protrusions 7b are appropriately determined. An engaging projection 7a is provided at a position in the middle of the nipple 7 in the direction of the hose axis CL.

  The socket 8 is formed with a plurality of annular protrusions 9a spaced from each other in the direction of the hose axis CL on the inner peripheral surface. The cross section of the annular protrusion 9a is trapezoidal, and an annular groove 9b is formed between adjacent annular protrusions 9a. The front end of the socket 8 is an engaging portion 8a, and the engaging portion 8a and the engaging protrusion 7a of the nipple 7 are engaged.

  An annular bulging portion 8b that is continuous in the circumferential direction is formed between the portion 8c in which the socket 8 is crimped and the engaging portion 8a. The inner peripheral surface of the bulging portion 8b bulges more outward than the annular groove 9b. A step g between the inner peripheral surface (outermost peripheral position) of the bulging portion 8b and the annular groove 9b is, for example, 1.9 mm to 2.2 mm. Between the bulging portion 8b and the outer peripheral surface of the nipple 7, the hose 2 (the inner surface layer 3, the reinforcing layer 4, and the outer surface layer 5) is closely packed.

  The nipple 7 and the socket 8 are made of a material that hardly causes hydrogen embrittlement (for example, SUS316L).

  In order to manufacture the assembly product 1 by attaching the hose fitting 6 to the end portion of the hose 2, a caulking device 10 illustrated in FIG. 5 is used. The caulking device 10 includes an annular base 11, a die 12, a pressure member 13, and a pressure drive unit 14. The die 12 is an annular body having a through hole 12a and is divided in the circumferential direction. A tapered portion 12b is formed in the through hole 12a.

  A procedure for manufacturing the assembly product 1 will be exemplified below.

  First, as illustrated in FIG. 4, the engaging protrusion 7 a of the nipple 7 and the engaging portion 8 a of the socket 8 are assembled, and both are engaged by crimping from the outer peripheral side of the engaging portion 8 a. Next, the end of the hose 2 is fitted between the nipple 7 and the socket 8 so as to be sandwiched. The tip surface of the hose 2 is set in contact with the nipple 7 (engagement protrusion 7a) so that no gap is generated in the direction of the hose axis CL.

  Next, as illustrated in FIG. 5, the tip end portion of the hose fitting 6 is protruded, and the die 12 is externally fitted to the end portion of the hose 2 into which the hose fitting 6 is fitted. That is, the end portion of the hose 2 fitted with the hose fitting 6 is inserted into the through hole 12a of the die 12 and set in a state of being set. In this state, the opposite end portion side (the lower side in FIG. 5) of the hose 2 of the hose fitting 6 is located at the tapered portion 12b.

  Next, a plate-like pressure member 13 is interposed on the tip side of the hose fitting 6, and the hose fitting 6 is pressed to the opposite end side of the hose 2 by the pressure applied by the pressure driving unit 14. Accordingly, the hose fitting 6 is guided along with the hose 2 by the tapered portion 12b and is pushed into the through hole 12a. Since the taper portion 12b is reduced in diameter in the direction in which the hose fitting 6 is pushed, the outer peripheral surface of the socket 8 is pressurized from the opposite end side to the end side of the hose 2. Become. That is, the outer peripheral surface of the socket 8 is pressurized in a circumferentially continuous state by being guided by the taper portion 12b, and this pressurization is performed from the opposite end portion side to the end portion side of the hose 2. . In this way, the assembly product 1 illustrated in FIG. 1 is manufactured.

  By this pressurization, the socket 8 is reduced in diameter, and the annular projection 9a bites into the hose 2 and is swaged. A protruding portion 8b is formed.

  The portion of the hose 2 that is pressurized with the caulking of the socket 8 does not escape to the opposite end side of the hose 2, and a part thereof moves toward the end side of the hose 2. Therefore, between the bulging portion 8b and the outer peripheral surface of the nipple 7, the hose 2 is filled with high density by the moved hose 2 portion.

  The hose fitting 6 is fixed by the hose 2 filled with high density between the bulging portion 8 b and the outer peripheral surface of the nipple 7 in addition to the fixing force at the portion 8 c where the socket 8 is crimped. Therefore, the hose fitting 6 can be firmly fixed to the hose 2 without tightening with an excessive force as compared with the conventional case, and the sealing performance can be improved while suppressing the deformation of the nipple 7. Further, since the inner peripheral surface of the bulging portion 8b bulges to the outer peripheral side than the annular groove 9b, an appropriate space for receiving the volume of the hose 2 moved by caulking is secured. Accordingly, the volume of the moved hose 2 is easily received, and the nipple 7 is not excessively pressurized by the volume of the moved hose 2, which is more advantageous for suppressing the deformation of the nipple 7. ing.

  In this way, the hose 2 and the hose fitting 6 are firmly fixed as compared with the conventional case, so that the occurrence of problems such as a cover bulge is suppressed and the durability is improved.

  The ratio D / B between the tip width B of the annular protrusion 9a and the outer diameter D of the hose 2 is preferably set to 6.0 to 11.0. When D / B is less than 6.0, it is difficult to obtain sufficient sealing properties. When D / B exceeds 11.0, the surface pressure of the crimped portion 8c becomes excessive, and adverse effects are likely to occur.

  Further, the ratio P / B between the tip width B and the groove pitch P is preferably set to 2.5 to 6.0. If P / B is less than 2.5, it is difficult to obtain sufficient sealing properties. If P / B exceeds 6.0, the surface pressure of the crimped portion 8c becomes excessive, and adverse effects are likely to occur.

  The ratio L / D between the outer diameter D of the hose 2 and the length L of the socket 8 is preferably set to 3.0 or more. When L / D is less than 3.0, it becomes difficult to obtain sufficient sealing properties. The ratio L / D is more preferably 3.0 to 4.0 from the characteristics of the hose (flexibility and ease of handling).

  The ratio L1 / L between the length L of the socket 8 and the length L1 of the portion 8c to which the socket 8 is crimped is preferably set to 0.6 to 0.8. If L1 / L is less than 0.6, it is difficult to obtain a sufficient sealing property, and if L1 / L is more than 0.8, it is difficult to secure a sufficient space for the bulging portion 8b.

  The compression rate Cr of the hose 2 at the position of the annular protrusion 9a of the portion 8c where the socket 8 is crimped is preferably 40% to 55%. The compression ratio Cr is a value calculated by (thickness of the peripheral wall of the hose 2 after crimping / thickness of the peripheral wall of the hose 2 before crimping) × 100 (%). The position at which the compression rate Cr is measured is the position where the hose 2 is most compressed.

  When the compression ratio Cr is less than 40%, the volume of the hose 2 that moves toward the end portion of the hose 2 is reduced, so that it is difficult to ensure sufficient sealing performance. On the other hand, when the compressibility Cr is more than 55%, the pressurized hose 2 (outer surface layer 5, reinforcing layer 4, inner surface layer 3) is liable to be damaged and the durability may be adversely affected.

  For the same type of hose having the structure illustrated in FIG. 2, hose fittings having different specifications as shown in Table 1 are caulked by the method illustrated in FIG. Test samples (Examples 1 to 8) of assembly products were produced. The breaking pressure was evaluated for each test sample, and the results are shown in Table 1. The level difference g in Table 1 is the level difference between the inner peripheral surface (outermost peripheral position) of the bulging portion of the socket and the annular groove.

The specifications of the hose are as follows.
Inner layer: material is nylon, inner diameter is 8.0 mm, layer thickness is 1.0 mm.
Outer surface layer: Material is polyester, outer diameter 16.0 mm, layer thickness 0.8 mm.
Reinforcing layer: Three layers are laminated with a blade structure of PBO fiber having a wire diameter of 0.15 mm.

  The first reinforcing layer 4a (innermost circumferential layer) has a braid angle A1 of 46 °, a braid density coefficient K of 2.0, 96 fibers, and a braid pitch P1 of 33.0 mm.

  The second reinforcing layer 4b has a braid angle A2 of 51 °, a braid density coefficient K of 2.0, 96 fibers, and a braid pitch P1 of 30.5 mm.

  The third reinforcing layer 4c has a braid angle A3 of 56 °, a braid density coefficient K of 2.0, 96 fibers, and a braid pitch P1 of 28.5 mm.

[Destruction pressure]
This evaluation was performed according to the method described in JIS B 8362. As a hydrogen filling hose, the practical use with an internal pressure of about 70 to 84 MPa was assumed, and an evaluation was performed in consideration of a safety factor of about four times the working pressure.

  From the results of Table 1, as a hydrogen filling hose, Examples 1 to 8 are sufficiently resistant to practical use with an internal pressure of 70 MPa, and Examples 3 to 8 have pressure resistance (breaking pressure) that can sufficiently withstand practical use of an internal pressure of 84 MPa. It was confirmed that In addition, the failure mode of Examples 1-3 was metal fitting removal, and the failure modes of Examples 4-8 were hose rupture.

  Moreover, about the said Example 4, the following impact resistance was evaluated.

[Shock resistance]
This evaluation was performed with reference to an impact pressure test defined in JIS B8360. The number of impulses until the hose was broken by applying a pressure of 84 MPa × 100% with a trapezoidal wave with a cycle of 0.4 Hz to the hose of the test sample with oil having an oil temperature of 85 ° C. was measured.

  As a result, it was confirmed that the hose and the hose fitting were not damaged until the number of impulses was 467,000, and had excellent impact resistance.

DESCRIPTION OF SYMBOLS 1 Assembly product 2 Hydrogen filling hose 3 Inner surface layer 4 Reinforcement layer 4a 1st reinforcement layer 4b 2nd reinforcement layer 4c 3rd reinforcement layer 5 Outer surface layer 6 Hose metal fitting 7 Nipple 7a Engagement protrusion 7b Stopping protrusion 8 Socket 8a Engagement Part 8b bulging part 8c crimped part 9a annular projection 9b annular groove 10 crimping device 11 base 12 die 12a through hole 12b taper part 13 pressure member 14 pressure drive part f PBO fiber

Claims (7)

In a method for manufacturing a hydrogen filling hose and hose fitting assembly in which a hose fitting comprising a nipple and a socket is attached to the end of the hydrogen filling hose, the hydrogen filling hose has an inner surface layer and an outer surface that are coaxially laminated. At least two reinforcing layers are coaxially laminated with each other, and the inner layer has a gas permeability coefficient of 1 × 10 ⁻⁸ cc · cm / cm ² · sec. A blade structure in which the outer surface layer is made of a thermoplastic resin and each of the reinforcing layers is braided with polyparaphenylene benzbisoxazole fibers. The portion is sandwiched between the nipple and the socket, and the outer peripheral surface of the socket is pressurized in a continuous state in the circumferential direction, and this pressure is applied to the end portion from the opposite end side of the hydrogen filling hose. By moving toward the side, the socket is reduced in diameter and the annular protrusions provided on the inner peripheral surface of the socket are bitten into the hydrogen filling hose and crimped. On the end side of the hose, a bulging portion is formed by bulging the inner peripheral surface on the outer peripheral side of the annular groove between the annular projections, and the hydrogen filling hose is between the bulging portion and the nipple. In the state of being filled, the assembly product manufacturing method of the hydrogen filling hose and the hose fittings, characterized in that attaching a hose fitting to the end of the hydrogen filling hose.   The ratio D / B between the tip width B of the annular protrusion and the outer diameter D of the hydrogen filling hose is 6.0 to 11.0, and the ratio P / of the tip width B and the groove pitch P of the annular groove The method for producing an assembly product of a hydrogen filling hose and a hose fitting according to claim 1, wherein B is 2.5 to 6.0. The ratio L / D of the outer diameter D of the hydrogen filling hose to the length L of the socket is 3.0 or more, and the ratio L1 / the length L1 of the socket length L to the length L1 of the portion where the socket is crimped L is 0.6-0.8, The manufacturing method of the assembly product of the hose for hydrogen filling and hose metal fittings of Claim 1 or 2. The assembly of the hydrogen filling hose and hose fitting according to any one of claims 1 to 3, wherein the compression rate of the hydrogen filling hose at the position of the annular projection in the portion where the socket is crimped is 40% to 55%. Product manufacturing method. The braiding angle of the polyparaphenylene benzbisoxazole fiber is increased as the outer peripheral reinforcing layer, and the braiding angle in the innermost reinforcing layer is set to 43 ° to 51 °, and the braid density of each reinforcing layer The manufacturing method of the assembly product of the hose for hydrogen filling and hose metal fittings in any one of Claims 1-4 which set the coefficient to 1.0 or more and 4.5 or less.   The number of layers of the reinforcing layer is three, the braid angle in the second reinforcing layer from the inner peripheral side is set to 48 ° to 53 °, and the braid angle in the outermost reinforcing layer is set to 53 ° to 58 °. The method for manufacturing an assembly product of the hydrogen filling hose and the hose fitting according to any one of claims 1 to 5.   The assembly product of a hydrogen filling hose and a hose fitting according to any one of claims 1 to 5, wherein the number of layers of the reinforcing layer is two, and the braiding angle in the outermost reinforcing layer is set to 51 ° or more and 58 ° or less. Manufacturing method.

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