JP7223641B2 - Liner constituent member, resin liner made of liner constituent member, and method for producing resin liner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liner component made of a resin material, a resin liner formed by joining two liner components, and a manufacturing method for manufacturing the resin liner.

The applicant of the present application has proposed a high-pressure tank liner, which is a resin liner obtained by bonding open ends of first and second liner constituent members made of a resin material, and a method of manufacturing the same.

This high-pressure tank liner has first and second liner constituent members which are formed into hollow semi-cylindrical bodies, one end of which is formed with an open end, and a , and flange portions projecting radially outward are formed.

Then, the flange portion of the first liner constituent member and the flange portion of the second liner constituent member are axially pressed by a jig for vibration welding to bring them into contact with each other. By vibrating the member, the contact portion of the flange portion is melted or softened for joining.

After this joining step is completed, the flange portions protruding from the outer peripheral surfaces of the first and second liner constituent members are cut away leaving a minimum necessary portion, and a reinforcing layer made of fiber reinforced resin is formed on the outer peripheral surfaces. Wrapped and covered.

Japanese Patent Application No. 2017-249324

The present invention has been made in relation to the above proposal, and by increasing the amount of expansion of the radially outward diameter of the flange portion before joining to the amount of heat shrinkage that occurs during joining, it is possible to prevent depression during joining. It is an object of the present invention to provide a liner constituent member capable of suppressing and reducing the amount of protrusion of a flange portion from the outer peripheral wall, a resin liner comprising the liner constituent member, and a method for manufacturing the resin liner.

In order to achieve the above object, an embodiment of the present invention has a tubular liner component formed of a resin material and having an opening at an end, and the liner components are connected to each other at the ends of the opening. A liner-constituting member for forming a resin liner by coaxially joining the connecting surfaces to each other, wherein
The liner-constituting portion includes a flange portion protruding radially outward in the vicinity of the connecting surface;
a first diameter-increasing portion whose diameter is increased from the end opposite to the opening toward the opening;
a second enlarged diameter portion connected to the first enlarged diameter portion, gradually expanding in diameter from the first enlarged diameter portion toward the connecting surface side, and formed to have a larger degree of diameter expansion than the first enlarged diameter portion; and the flange portion is formed on the second enlarged diameter portion.

According to the present invention, the liner-constituting member made of a resin material has a cylindrical liner-constituting portion having an opening at its end, and a connecting surface connecting the liner-constituting portions to each other at the end of the opening. is provided so that a resin liner can be configured by joining the connection surfaces coaxially, and the liner-constituting portion includes a flange portion protruding radially outward in the vicinity of the connection surface, and an opening. a first enlarged diameter portion whose diameter is enlarged from the opposite end portion toward the opening portion; and a second enlarged diameter portion formed to be larger in diameter than the portion.

Therefore, when the openings of the liner constituent members are brought into contact with each other and joined together, even if thermal shrinkage occurs due to the heat generated in the contact portion during joining, the second enlarged diameter portion near the contact portion is formed so that the degree of diameter expansion is greater than that of the first diameter expansion portion, it is possible to avoid depression of the liner constituent portion due to thermal contraction.

As a result, depression of the flange portion provided in the second enlarged diameter portion is also avoided, and along with this, when cutting the flange portion after joining, the cutting jig is moved to the minimum clearance with respect to the liner constituent portion. Since it can be cut close to the liner component, compared to the liner component, which tends to sink due to heat shrinkage, the amount of protrusion of the flange portion can be reduced, and the step (flange portion) in the liner component can be suppressed. It becomes possible to perform the covering with the reinforcing layer more reliably and stably.

According to the present invention, the following effects are obtained.

That is, in a liner constituent member made of a resin material and provided with a tubular liner constituent portion having an opening at one end, a flange portion protruding radially outward in the vicinity of a connecting surface and a flange portion protruding toward the opening side A first enlarged diameter portion that expands in diameter, and a second enlarged diameter portion that gradually expands in diameter toward the connecting surface side with respect to the first enlarged diameter portion and is formed to have a greater degree of diameter expansion than the first enlarged diameter portion. When the openings of the liner constituent members are brought into contact with each other and joined together, even if thermal shrinkage occurs due to heat generated in the abutting portions, the first enlarged diameter portion is preliminarily protected. It is possible to prevent the liner-constituting portion from sinking into the first enlarged-diameter portion by the second enlarged-diameter portion formed to have a large diameter-enlarged degree.

As a result, depression of the flange portion provided in the second enlarged diameter portion is preferably avoided, and along with this, the flange portion is cut by bringing the cutting jig closer to the liner constituent portion to the minimum clearance. This makes it possible to reduce the amount of protrusion of the flange portion, compared to a liner component that is not provided with the second enlarged diameter portion and is subject to depression due to heat shrinkage.

1 is an overall plan view of a high-pressure tank that is a resin liner according to an embodiment of the present invention; FIG. FIG. 2 is an exploded plan view showing a state before first and second liner constituent members forming the resin liner shown in FIG. 1 are joined; 3A is an enlarged cross-sectional view of the vicinity of the first flange portion of the first liner component, and FIG. 3B is an enlarged cross-sectional view of the vicinity of the second flange portion of the second liner component. 3C is an enlarged cross-sectional view showing a state in which the open ends of the first and second liner constituent members shown in FIGS. 3A and 3B face each other and vibration welding jigs are inserted into the annular concave portions, respectively; FIG. 5 is an enlarged cross-sectional view showing a contacting step in which the open ends of the first and second liner constituent members in FIG. 4 are brought into contact with each other; FIG. FIG. 6 is an enlarged cross-sectional view showing a joining step in which the first and second liner constituent members shown in FIG. 5 are compressed and joined in a direction of approaching each other; FIG. 7 is an enlarged cross-sectional view (a state in which thermal shrinkage is completed) showing a state before cutting off the first and second flange portions of the resin liner shown in FIG. 6 ; FIG. 5 is an enlarged cross-sectional view showing a state in which the bonded first and second flange portions are cut off by a cutting cutter to form land portions and the manufacture of the resin liner is completed; 9A is an enlarged cross-sectional view of first and second liner constituent members having a second enlarged diameter portion according to a first modification, and FIG. 9B is an enlarged cross-sectional view showing a second enlarged diameter portion according to a second modification. FIG. 4 is an enlarged cross-sectional view of first and second liner constituent members.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a liner constituent member according to the present invention and a resin liner 10 comprising the liner constituent member will be described in detail below with reference to the accompanying drawings, with reference to preferred embodiments in relation to the method of manufacturing the liner constituent member. Here, a case will be described in which the first and second liner constituent members 12 and 14, which are liner constituent members, are joined to form a high-pressure tank, which is the resin liner 10. FIG.

First, the first and second liner constituent members 12 and 14 constituting the resin liner 10 will be described with reference to FIGS. 1 and 2. FIG.

The first and second liner constituent members 12 and 14 are formed to have substantially the same shape by, for example, performing injection molding using a molten resin material with an injection molding machine (not shown), and are hollow semi-cylindrical members. formed into a shape. An open end (opening, connection surface) 16 is formed at one end of the first and second liner constituent members 12 and 14, and a closed end 18 is formed at the other end so as to gradually reduce in diameter. It is formed. That is, the first and second liner constituent members 12 and 14 are formed in a bottomed tubular shape with one end side open. It should be noted that the first and second liner constituent members 12 and 14 are not limited to being cylindrical as described above, and may be, for example, cylinders having a polygonal cross-section.

1 to 3B, the first and second liner constituent members 12 and 14 initially protrude radially outward from the outer peripheral wall (liner constituent portion) 34 in the vicinity of the open end 16 thereof. A first and second flange portion (flange portion) 20, 22 are formed, respectively, protruding by an amount H1 (see FIGS. 3A and 3B).

The first and second flange portions 20 and 22 are annularly formed at positions slightly closer to the closed end 18 (in the directions of arrows A1 and B1) from the end surface of the open end 16, and radially outward from the outer peripheral wall 34. an extending bottom portion 24, a side portion 26 extending substantially perpendicularly to the outer peripheral end of the bottom portion 24 toward the closed end 18 (directions of arrows A1 and B1), the outer peripheral wall 34, the bottom portion 24 and and an annular recess 28 surrounded by sides 26 . The bottom portion 24 is formed substantially perpendicular to the axis C (see FIGS. 1 and 2) of the first and second liner components 12 and 14 and substantially parallel to the open end 16 .

The side portion 26 is formed substantially parallel to the outer peripheral wall 34, and as shown in FIGS. 3A and 3B, the side portion 26 has a diameter gradually increasing in the direction away from the bottom portion 24 (directions of arrows A1 and B1). A tapered surface 30 inclined outward is formed, and the tapered surface 30 facilitates the insertion and removal of vibration welding jigs 44a and 44b (see FIGS. 4 to 6) into and from the annular recess 28. As shown in FIG.

As shown in FIG. 2, the side portion 26 is formed with a cutout portion 32 so as to cut out a portion of the end on the side of the closed end 18 (directions of arrows A1 and B1). For example, when vibration welding is performed, rotation is prevented by engaging a rotation-stopping jig.

An annular recess 28 is formed between the outer peripheral wall 34 of the first and second liner components 12, 14 and the sides 26 of the first and second flange portions 20, 22, as shown in FIGS. 3A-3B. When the first liner constituent member 12 and the second liner constituent member 14 are joined by vibration welding, tip portions 46 (FIG. 4) of vibration welding jigs 44a and 44b, which will be described later, are contained therein. ) are inserted respectively. Therefore, the width and depth of the annular recess 28 are set to dimensions that allow insertion of the distal ends 46 of the vibration welding jigs 44a and 44b.

The outer peripheral walls 34 of the first and second liner constituent members 12 and 14 are formed with a substantially uniform plate thickness, and are formed so as to gradually expand radially outward from the closed end 18 toward the open end 16 . A first enlarged diameter portion 36 extending at a first angle θ1 from the closed end 18 toward the open end 16 (directions of arrows A2 and B2), and the other end 36a of the first enlarged diameter portion 36 is open. and a second enlarged diameter portion 38 extending at a second angle θ2 toward the end 16 (directions of arrows A2 and B2).

The first enlarged diameter portion 36 extends, for example, from the closed end 18 to a position on the closed end 18 side (in the direction of arrows A1 and B1) by a predetermined distance with respect to the first and second flange portions 20 and 22. The first angle θ1 is set at, for example, 1 to 2° or less with respect to an imaginary line C1 substantially parallel to the axes C of the first and second liner constituent members 12 and 14 .

This first angle .theta.1 is a draft required when the first and second liner constituent members 12 and 14 are removed from the mold during molding. As a result, the first enlarged diameter portion 36 extends from one end to the other end such that the outer diameter and the inner peripheral diameter of the other end 36a on the second enlarged diameter portion 38 side (directions of arrows A2 and B2) are maximized. diameter.

The second enlarged diameter portion 38 extends from the other end 36a side of the first enlarged diameter portion 36 to the bottom surface (flat surface) 24a of the bottom portion 24 of the first and second flange portions 20 and 22, and the second angle θ2 is , defined with respect to an imaginary line C1 substantially parallel to the axes C of the first and second liner constituent members 12 and 14 with the other end 36a of the first enlarged diameter portion 36 as a base point, and larger than the first angle θ1 It is set by an angle (θ1<θ2). In other words, the diameter expansion rate (diameter expansion degree) of the second diameter expansion portion 38 is larger than the diameter expansion rate (diameter expansion degree) of the first diameter expansion portion 36 .

In this manner, the second enlarged diameter portion 38 is formed so as to increase in diameter from one end to the other end so that the outer and inner diameters of the first and second flange portions 20 and 22 are maximized. ing.

Also, the second angle θ2 is set by the first expansion when the second expanded diameter portion 38 is deformed radially inward due to heat shrinkage after the first and second liner constituent members 12 and 14 are joined by vibration welding. The angle is set so as not to collapse radially inward with respect to the other end 36 a of the diameter portion 36 .

Specifically, the diameter D of the first and second liner components 12, 14, the thickness T of the outer peripheral wall 34, and the rigidity of the first and second flange portions 20, 22 shown in FIGS. Since the amount of radially inward depression during contraction is different, the second angle θ2 and the second expanded diameter are determined based on the diameter D, the thickness T of the outer peripheral wall 34, and the rigidity of the first and second flange portions 20 and 22. The axial length of the portion 38 is set.

For example, when the diameter D of the first and second liner constituent members 12, 14 is large, the thickness T of the outer peripheral wall 34 is thin, or the rigidity of the first and second flange portions 20, 22 is low, the second 2. Since the amount of deformation (the amount of depression) due to thermal contraction of the expanded diameter portion 38 increases, the second angle θ2 is set large. In this case, since the amount of deformation (the amount of depression) due to thermal contraction of the second enlarged diameter portion 38 is small, it can be dealt with by setting the second angle θ2 small.

Further, in other words, as shown in FIGS. 3A and 3B, the angle θ3 formed by the second enlarged diameter portion 38 and the open end 16 is set to be 90° or more (θ3≧90° ).

As a result, the outer peripheral walls 34 of the first and second liner constituent members 12 and 14 are arranged so that the other end 36a of the first enlarged diameter portion 36 and one end of the second enlarged diameter portion 38 are in a state before they are joined to each other. A boundary portion between the two connected and having different inclination angles is formed in a stepped shape.

On the other hand, as shown in FIGS. 1 and 2, the closed end 18 is formed at its top with a recess 40 recessed toward the open end 16 (in the directions of arrows A2 and B2), and at the center of its bottom. A boss portion 42 is provided that protrudes toward the side away from the open end 16 (directions of arrows A1 and B1). The boss portion 42 protrudes axially outward from the top portion of the closed end 18, and a valve portion (not shown) is attached to the boss portion 42, whereby the high-pressure tank, which is the resin liner 10, is manufactured.

Next, a case of manufacturing the resin liner 10 from the first and second liner constituent members 12 and 14 configured as described above will be described.

First, as shown in FIG. 4, the open end 16 of the first liner component 12 and the open end 16 of the second liner component 14 face each other, are separated from each other by a predetermined distance in the axial direction, and are aligned coaxially. Arrange them so that they form a shape. Then, the tip portions 46 of a pair of vibration welding jigs 44a, 44b are inserted into the annular recesses 28 of the first and second liner constituent members 12, 14, respectively. The tip portion 46 is in surface contact with the bottom surface 24 a of the bottom portion 24 formed substantially parallel to the open end 16 .

Also, if necessary, the first and second liner constituent members 12 can be adjusted by engaging a detent jig (not shown) with the notch 32 (see FIG. 2) of the first and second flanges 20 and 22 . , 14 in the rotational direction.

Next, the pair of vibration welding jigs 44a and 44b are axially urged so that the first flange portion 20 of the first liner constituent member 12 and the second flange portion 22 of the second liner constituent member 14 are brought together. The first liner constituent member 12 and the second liner constituent member 14 are brought closer to each other by pressing them in the axial direction (the arrow X direction) in the approaching direction. As a result, as shown in FIG. 5, a contacting step is performed in which the open end 16 of the first liner component 12 and the open end 16 of the second liner component 14 are brought into contact.

At this time, the tip portions 46 of the vibration welding jigs 44a and 44b press the bottom surface 24a of the bottom portion 24, thereby reliably moving the first and second liner constituent members 12 and 14 in the axial direction (the arrow X direction). It becomes possible to press them, and it becomes possible to bring them into contact with each other while applying an even pressing force to the open ends 16 .

Next, in a state in which the first liner constituent member 12 and the second liner constituent member 14 are pressed toward each other by vibration welding jigs 44a and 44b shown in FIG. One of the vibration welding jigs 44a inserted into the first liner component member 12 is vibrated along the radial direction (the arrow Y direction).

As a result, as shown in FIG. 6, frictional heat is generated at the contacting portions of the first liner constituent member 12 and the second liner constituent member 14, and the contacting portions are softened or melted and pressed toward each other. The open ends 16 of the first and second liner components 12, 14 are compressed. That is, a heating step is performed to heat the contact portions of the first and second liner constituent members 12 and 14 .

At this time, part of the softened or melted resin material flows toward the inner peripheral side and the outer peripheral side of the outer peripheral wall 34 as a result of this compression.

Further, instead of vibrating one vibration welding jig 44a as described above, the other vibration welding jig 44b inserted into the second liner constituent member 14 is moved in the diametrical direction of the second liner constituent member 14. You may make it vibrate along.

Then, as shown in FIGS. 6 and 7, after a predetermined time has passed since the start of vibration by the vibration welding jigs 44a and 44b, the vibration is stopped and the vibration welding jigs 44a and 44b are moved into the annular recess 28. As shown in FIGS. At the same time, the softened or melted resin material at the joining portion is cooled and solidified, so that the contact portion (open end) between the first liner component 12 and the second liner component 14 is formed. 16) are bonded to complete the resulting bonding process of bond 48. FIG.

At this time, in the vicinity of the joint 48 of the first and second liner constituent members 12 and 14, heat shrinkage occurs due to cooling of the frictional heat generated during the vibration welding, causing deformation inward in the radial direction. (see the two-dot chain line shape in FIG. 7), the inclination angle ( Since the second enlarged diameter portion 38 has a large second angle θ2), even if it is deformed radially inward due to heat shrinkage, it is It is avoided that the diameter becomes small and sinks.

Next, as shown in FIG. 7, the cutting cutter 50 is approached from the outer peripheral side of the resin liner 10 to which the first and second liner constituent members 12, 14 are joined, and the first and second flange portions 20, A portion of 22 is excised. The cutting cutter 50 is formed with a predetermined width along the axial direction of the resin liner 10 so as to cover the first and second flange portions 20 and 22, and the cutter surface 50a is formed substantially flat.

Then, the cutting cutter 50 is arranged so that the cutter surface 50a faces the first and second flange portions 20 and 22 and is substantially parallel to the axis C of the resin liner 10, and the first and second flange portions are cut. 20, 22 and cut at the position of the cutting line CL. This cutting line CL is set based on a position where the cutter surface 50a can maintain a predetermined clearance with respect to the outer peripheral wall 34 of the resin liner 10 .

Along with this cutting, as shown in FIG. 8, most of the side portions 26 and bottom portions 24 of the first and second flange portions 20, 22 are excised, and the first and second flange portions 20, 22, The joint portion 48 that flows outward and protrudes from the outer peripheral wall 34 is integrated to form a land portion 52 that protrudes with a residual protrusion amount (protrusion height) H2 with respect to the outer peripheral wall 34, and the resin liner 10 shown in FIG. is obtained.

The resin liner 10 is used, for example, as a high-pressure tank (high-pressure vessel), and the corners of the remaining land portions 52 of the first and second flange portions 20 and 22 are processed to obtain a circular cross-sectional shape. An arc-shaped R portion 54 is formed, and a reinforcing layer (not shown) made of fiber reinforced resin such as carbon fiber reinforced plastic (CFRP) is wound and covered. Instead of the R portion 54 described above, for example, a C portion having a corner chamfered at about 45° may be provided.

At this time, as shown in FIG. 8, the residual protrusion amount H2 of the land portion 52 (the first and second flange portions 20, 22) with respect to the outer peripheral wall 34 does not have the second enlarged diameter portion 38, for example. Since it is suppressed compared to the residual protrusion amount H3 of the resin liner 10' (H2<H3), the reinforcing layer is suppressed from being caught on the land portion 52, and the R portion 54 also prevents the reinforcing layer from being damaged. be done.

Also, the first and second liner constituent members 12 and 14 are not limited to being formed in the same shape as described above, but may be formed in different shapes and joined together.

Furthermore, the first and second liner constituent members 12 and 14 constituting the resin liner 10 are not limited to being joined by vibration welding. Vibration welding and infrared welding may be combined. Alternatively, the first and second liner constituent members 12 and 14 may be joined by hot plate welding.

Furthermore, the second enlarged diameter portion 38 provided on the outer peripheral wall 34 of the first and second liner constituent members 12, 14 has a tapered shape inclined at a second angle θ2 with respect to the imaginary line C1 substantially parallel to the axis C. For example, it may have an arcuate cross-section that gradually expands toward the open end 16 (in the directions of arrows A2 and B2). In other words, the cross-sectional shape is not particularly limited as long as it gradually expands toward the open end 16 (in the directions of arrows A2 and B2).

Furthermore, when the second enlarged diameter portion 38 is formed to extend from the other end 36a of the first enlarged diameter portion 36 to the bottom portions 24 of the first and second flange portions 20 and 22 as described above, For example, like the second enlarged diameter portion 60 shown in FIG. , or the other end may be formed to extend to the open end 16 like the second enlarged diameter portion 70 shown in FIG. 9B.

That is, the diameter D of the first and second liner components 12, 14, the thickness T of the outer peripheral wall 34, and the rigidity of the first and second flanges 20, 22 determine the diameter of the second enlarged diameter portions 38, 60, 70. length can be set appropriately.

As described above, in the present embodiment, in the resin liner 10 configured by joining the open ends 16 of the first and second liner constituent members 12 and 14, the first and second liner constituent members 12, 14 has a first enlarged diameter portion 36 formed on the closed end 18 side (directions of arrows A1 and B1) and the other end 36a of the first enlarged diameter portion 36 connected to the open end 16 side ( and a second enlarged diameter portion 38 extending in the direction of arrows A2 and B2), and the second angle θ2 of the second enlarged diameter portion 38 is larger than the first angle θ1 of the first enlarged diameter portion 36. In the vicinity of the open end 16 of the second enlarged diameter portion 38, first and second flange portions 20 and 22 projecting radially outward are provided, respectively.

Therefore, when the open ends 16 of the first and second liner constituent members 12 and 14 were brought into contact with each other and joined by vibration welding, the contact portion heated by the frictional heat generated by the welding was cooled and thermal contraction occurred. Even in such a case, by increasing the inclination angle of the second enlarged diameter portion 38 in the vicinity of the contact portion, the outer peripheral wall 34 can be prevented from sinking even if the outer peripheral wall 34 is deformed radially inward due to the thermal contraction. be able to.

As a result, when the first and second flange portions 20 and 22 provided in the vicinity of the open end 16 are cut by the cutting cutter 50 after the first and second liner constituent members 12 and 14 are joined, the first The second enlarged diameter portion 38 (outer peripheral wall 34), which is not recessed radially inwardly with respect to the enlarged diameter portion 36 and is maintained substantially parallel to the axis C of the resin liner 10, is cut with a minimum clearance. The cutter 50 can be approached for cutting.

As a result, depression of the first and second liner constituent members 12 and 14 at the time of bonding is suppressed, so that the first and second flange portions 20 and 22 (land portion 52) are more stable than the conventional resin liner 10'. By suppressing the step (land portion 52) with respect to the outer peripheral wall 34, the covering with the reinforcing layer can be performed more reliably and stably.

In addition, by suppressing the depression of the outer peripheral wall 34 of the resin liner 10, for example, when the resin liner 10 is applied to a high-pressure tank, it is possible to sufficiently secure the internal volume without reducing it. can.

The liner constituent member, the resin liner 10 made of the liner constituent member, and the method for manufacturing the resin liner 10 according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, other configurations are possible.

DESCRIPTION OF SYMBOLS 10... Resin liner 12... First liner constituent member 14... Second liner constituent member 16... Open end 20... First flange portion 22... Second flange portion 24... Bottom portion 26... Side portion 28... Annular concave portion 34... Peripheral wall 36 ... First enlarged diameter portion 38, 60, 70 ... Second enlarged diameter portion 48 ... Joint portion 52 ... Land portion

Claims (6)

It has a cylindrical liner-constituting part formed of a resin material and having an opening at an end, and a connection surface connecting the liner-constituting parts to each other is provided at the end of the opening, and the connection surfaces are coaxial with each other. A liner-constituting member that constitutes a resin liner by joining in a shape,
The liner-constituting portion includes a flange portion protruding radially outward in the vicinity of the connecting surface;
a first diameter-increasing portion whose diameter is increased from the end opposite to the opening toward the opening;
A second portion connected to the first diameter-enlarged portion, gradually expanding in diameter from the first diameter-enlargement portion toward the connecting surface side, and formed to have a greater degree of diameter expansion than the first diameter-enlargement portion. an enlarged diameter portion, wherein the flange portion is formed on the second enlarged diameter portion. The liner component of claim 1, wherein
The liner constituent member, wherein an angle formed by the second enlarged diameter portion and the connection surface is set to 90° or more. The liner component according to claim 1 or 2,
The flange portion is surrounded by a bottom portion protruding radially outward of the liner-constituting portion, a side portion connecting to the bottom portion and extending in a direction away from the connecting surface, and the bottom portion and the side portion. and an annular recess, wherein the bottom portion has a plane substantially parallel to the connecting surface. A resin liner formed by joining two liner-constituting members formed of a resin material and having openings at their ends,
A connecting surface for connecting the liner-constituting parts of the liner-constituting member is provided at an end of the opening,
The resin liner has a diameter-enlarged portion that gradually expands in diameter toward the connection surface in the vicinity of the opening, and the angle between the diameter-enlarged portion and the connection surface is set to 90° or more. . A method for manufacturing a resin liner, wherein the resin liner is obtained by joining two liner constituent members formed of a resin material and having openings at their ends, the method comprising:
A connection surface for connecting the liner constituent members is provided at an end of the opening,
In the vicinity of the opening, a diameter-enlarging portion that gradually expands in diameter toward the connection surface is provided,
a heating step of heating the connection surface;
an abutment step of abutting one connection surface and the other connection surface;
a joining step of joining the heated connection surfaces in contact with each other;
has
A method for manufacturing a resin liner, wherein the angle formed by the enlarged diameter portion and the connecting surface is reduced by heat. The liner component of claim 1, wherein
A liner-constituting member that constitutes a high-pressure vessel by winding a covering reinforcing layer made of a fiber-reinforced resin around the liner-constituting portion.

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