WO2024089939A1

WO2024089939A1 - Tire half, tire, method for producing tire half, and method for producing tire

Info

Publication number: WO2024089939A1
Application number: PCT/JP2023/024084
Authority: WO
Inventors: 寛治田中; 崇之藏田
Original assignee: 株式会社ブリヂストン
Priority date: 2022-10-24
Filing date: 2023-06-28
Publication date: 2024-05-02
Also published as: JP2024062296A

Abstract

This tire half comprises: a bead part including an embedded bead core; a knit layer comprising a knit main body which is formed from a first fibrous material, has a network having a turn-back shape continuing in the tire circumferential direction and the tire radial direction, and is endless in the circumferential direction and reinforcing bodies which are formed from a reinforcing fibrous material and knitted into the knit main body so as to be equally spaced along the tire circumferential direction to restrain the knit main body from elongating in the tire radial direction; and a resinous framework formed from a thermoplastic resin and integrated with the portion of the knit layer disposed on the tire-radial-direction outer side thereof and extending from the bead core to a crown part.

Description

Tire half, tire, tire half manufacturing method, and tire manufacturing method

The present invention relates to a tire half, a tire, a tire half manufacturing method, and a tire manufacturing method.

　Publication No. 2016/017508 of the same publication discloses a tire that includes a bead portion in which a bead core having a resin-coated cord is embedded, and a reinforcing layer in which a reinforcing material is coated with a resin material and heat-welded to the bead core, and that extends from the bead portion to the side portion.

In the configuration described in REP 2016/017508, it may be difficult to arrange the reinforcing material evenly in the circumferential direction.

The purpose of this disclosure is to provide technology relating to a tire half body, a tire, a tire half body manufacturing method, and a tire manufacturing method in which reinforcing bodies are evenly distributed in the circumferential direction.

The tire half body of the first embodiment includes a bead portion in which a bead core is embedded, a knitted body formed of a first fiber material and having a folded mesh that is continuous in the tire circumferential direction and the tire radial direction and is endless in the circumferential direction, a knitted layer having a reinforcing body formed of a reinforcing fiber material and woven into the knitted body at equal intervals in the tire circumferential direction and that regulates the elongation of the knitted body in the tire radial direction, and a resin skeleton formed of a thermoplastic resin and in which the knitted layer is integrated and arranged from the bead portion to the crown portion.

The second embodiment of the tire half is the tire half described in the first embodiment, in which the first fiber material is compatible with the thermoplastic resin.

The third embodiment of the tire half is the tire half described in the first or second embodiment, in which the knitted layer is located on the outer side of the tire in the resin skeleton.

The tire of the fourth aspect has a tire frame member formed by a pair of tire halves described in the first or second aspect, an annular belt layer arranged on the tire radial outside of the tire frame member, and a tread layer arranged on the tire radial outside of the resin annular belt.

The fifth aspect of the tire half body manufacturing method includes a primary molding step of forming a primary formed body by integrating an annular bead core with the inner end in the tire radial direction of a knit layer having a knitted body formed of a first fiber material, a folded mesh formed continuously in the tire circumferential direction and the tire radial direction, ends on both sides in the tire radial direction and endless in the tire circumferential direction, and a reinforcing body formed of a reinforcing fiber material and woven into the knitted body at equal intervals in the tire circumferential direction while restricting the elongation of the knitted body in the tire radial direction, and a primary molding step of forming a primary formed body by integrating an annular bead core with the inner end in the tire radial direction of the knitted body. The method includes a fixing step of fixing the bead core of the primary formed body to the inner end of the inner mold in the radial direction on one side surface of the inner mold in the axial direction while hanging the outer end of the primary formed body on the outer peripheral surface of the inner mold in the radial direction of the inner mold, a clamping step of forming a cavity using an outer mold that faces the peripheral surface of the inner mold and the side surface of the inner mold with a gap, and an injection step of injecting a resin material into the cavity from the other side of the inner mold in the axial direction of the inner mold relative to the bead core, and forming a resin skeleton while pressing the primary formed body against the outer mold.

The tire manufacturing method of the sixth aspect includes a joining step of joining a pair of tire halves manufactured by the tire half manufacturing method described in the fifth aspect, a belt layer arrangement step of arranging an annular belt layer on the tire radially outer side of the tire frame member manufactured by the joining step, and a tread layer arrangement step of arranging a tread layer on the tire radially outer side of the belt layer of the tire frame member.

This disclosure provides technology relating to a tire half body, a tire, a tire half body manufacturing method, and a tire manufacturing method in which reinforcing bodies are evenly distributed in the circumferential direction.

FIG. 1 is a cross-sectional view of a tire of the present disclosure. FIG. 2 is a cross-sectional view illustrating a skeletal member according to the present disclosure. FIG. 2 is a diagram illustrating a primary molded body according to the present disclosure. FIG. 4 is an enlarged view of a portion 3A in FIG. 3, illustrating the structure of a knitted layer of a primary molded body of the present disclosure. FIG. 2 is a diagram for explaining the manufacturing process of a tire according to the present disclosure, showing a state in which a primary molded body is placed in an inner mold. FIG. 2 is a diagram illustrating the manufacturing process of a tire according to the present disclosure, illustrating how a primary molded body is placed over an inner mold. FIG. 2 is a diagram for explaining a manufacturing process of a tire according to the present disclosure, showing a gate portion. FIG. 2 is a diagram illustrating a manufacturing process of a tire according to the present disclosure, and illustrates how resin is injected into a cavity to form a frame member.

Below, an example of an embodiment of the present disclosure will be described with reference to the drawings. Note that in each drawing, the same or equivalent components and parts are given the same reference symbols. Also, the dimensional ratios in the drawings have been exaggerated for the convenience of explanation and may differ from the actual ratios.

In addition, the arrow R in each figure indicates the radial direction of the tire 10, the arrow W indicates the width direction (axial direction) of the tire 10, and the arrow θ indicates the circumferential direction of the tire 10. In this disclosure, the "outside of the tire" refers to the outside in both the tire radial direction and the tire width direction, and coincides with the direction in which the arrows R and W point in each figure.

In this disclosure, thermoplastic resins (including thermoplastic elastomers) refer to polymeric compounds that soften and flow with increasing temperature and become relatively hard and strong when cooled. In this specification, polymeric compounds that soften and flow with increasing temperature and become relatively hard and strong when cooled and have rubber-like elasticity are defined as thermoplastic elastomers, and polymeric compounds that soften and flow with increasing temperature and become relatively hard and strong when cooled and do not have rubber-like elasticity are defined as non-elastomer thermoplastic resins.

Thermoplastic resins (including thermoplastic elastomers) include polyolefin thermoplastic elastomers (TPO), polystyrene thermoplastic elastomers (TPS), polyamide thermoplastic elastomers (TPA), polyurethane thermoplastic elastomers (TPU), polyester thermoplastic elastomers (TPC), and dynamically crosslinked thermoplastic elastomers (TPV), as well as polyolefin thermoplastic resins, polystyrene thermoplastic resins, polyamide thermoplastic resins, and polyester thermoplastic resins.

(composition)
1 and 2 show a tire 10 according to the present disclosure. The tire 10 according to the present disclosure includes a tire frame member 17 having a pair of bead portions 12, a side portion 14 extending from the bead portions 12 to the radially outer side of the tire 10, and a crown portion 16 (outer peripheral portion) connecting a radially outer end of the tire 10 of one side portion 14 to a radially outer end of the tire 10 of the other side portion 14. The tire frame member 17 includes a belt layer 32 formed of a resin cord member 26 on the radially outer side of the tire 10, and a tread layer 30 on the radially outer side of the belt layer 32, thereby forming the tire 10.

In this disclosure, the radial direction, width direction, and circumferential direction of the tire half body 17A coincide with the radial direction, width direction, and circumferential direction of the tire 10, as shown in FIG. 1.

FIG. 2 is a cross-sectional view taken along the width direction of the tire 10, showing an example of the configuration of the tire 10 according to this embodiment.

As shown in FIG. 2, the belt layer 32 is formed by wrapping the resin cord member 26 around the outer periphery of the tire frame member 17 in the circumferential direction of the tire 10 and joining it to the tire frame member 17. The resin cord member 26 is also formed by joining adjacent portions of the resin cord member 26 in the width direction of the tire 10. The resin cord member 26 is formed by coating the cord member with a coating resin layer.

A tread layer 30 made of rubber, a material with better abrasion resistance than the resin material that constitutes the tire frame member 17, is arranged on the radially outer side of the belt layer 32 of the tire 10.

The cord member to be resin-coated in the resin cord member 26 is composed of a monofilament (single wire) of metal fiber or organic fiber, or a multifilament (twisted wire) made of twisted fibers. Examples of the resin cord member 26 include a monofilament (single wire) made of a single metal cord, and a multifilament (twisted wire) made of twisted multiple metal cords.

In FIG. 2, the cross-sectional shape of the resin cord member 26 (the shape of the cross section perpendicular to the longitudinal direction of the resin cord member 26) is approximately rectangular, but the resin cord member 26 according to this embodiment is not limited to this and can have various shapes, such as an approximately parallelogram.

The tread layer 30 is a portion provided on the peripheral surface 52C, which is the outer peripheral surface of the tire 10, and is formed by wrapping a material such as rubber around the belt on the radial outside of the tire 10.

As shown in FIG. 2, the tire frame member 17 includes a pair of tire halves 17A having a bead portion 12 and a resin frame 20 formed by injection molding a thermoplastic resin integrally with a side portion 42 and a half-width crown portion 44. The pair of tire halves 17A are formed by facing each other and joining them at the tire equatorial plane as shown in FIG. 1.

As shown in FIG. 2, the tire half body 17A has the bead portion 12, the knitted layer 41, and the resin skeleton 20 in which the knitted layer 41 is disposed radially outside the tire 10 from the bead core 18 to the crown portion 44 and integrated with the bead portion 12. The resin skeleton 20 is formed of a thermoplastic resin. In the resin skeleton 20 of this embodiment, the knitted layer 41 and the bead core 18 are integrated as a primary molded body 34, which will be described later, and then integrated with the resin skeleton 20.

As shown in FIG. 2, an annular bead core 18 made of a resin-coated steel cord is embedded in the bead portion 12. As an example, the bead core 18 has a substantially rectangular cross section.

Also, as shown in FIG. 2, the tire half 17A has a rubber layer 24 formed on the outer side in the width direction of the tire 10 from the bead portion 12 to the crown portion 44. This rubber layer 24 protects the tire half 17A from sunlight and the like when the tire 10 is mounted on a wheel, improving weather resistance.

(Primary molded body 34)
3 is a diagram showing a primary molded body 34 included in a tire half body 17A according to the present disclosure. As shown in FIG. 3, the primary molded body 34 includes a knitted body 36, a knitted layer 41 including a reinforcing body 40, and a bead core 18.

As shown in Figures 3 and 4, the knitted body 36 is formed from a thread-like first fiber material 38, has a folded mesh that is continuously formed in the circumferential direction and radial direction of the tire 10, has ends on both radial sides of the tire 10, and is endless in the circumferential direction of the tire 10. In other words, the knitted body 36 is a member formed by knitting the first fiber material 38 into a ring shape, and has elasticity in the radial and circumferential directions (the up-down and left-right directions in Figure 4).

Furthermore, as described below, the first fiber material 38 is formed from a material that is compatible with the resin skeleton 20 and the resin coating of the bead core 18. Specifically, it is a material such as a polyester-based thermoplastic elastomer, and the same type of resin as the resin skeleton 20 is preferably used. In this disclosure, compatibility refers to the property of materials of different components easily mixing with each other in a molten state.

As shown in Figures 3 and 4, the reinforcing body 40 is a thread-like member formed of a reinforcing fiber material, extending in the tire radial direction, and evenly distributed in the tire circumferential direction by being woven in the circumferential direction of the tire 10 in the knitted body 36, and restricts the elongation of the knitted body 36 in the radial direction of the tire 10. In addition, the reinforcing fiber material is formed of a material that is not compatible with the resin skeleton 20, as described later. Specifically, a material having a higher softening temperature and higher tensile strength than the first fiber material 38, such as aramid fiber or steel cord, is used. In addition, the reinforcing fiber material is not limited to a single material, and may be an artificial resin such as aramid fiber, or a fiber body in which a resin of the same type as the first fiber material 38 is coated on steel cord, etc. The shape and number of the reinforcing body 40 are appropriately determined according to the specifications of the tire 10 to be manufactured. In addition, the above-mentioned even distribution is sufficient if the multiple reinforcing bodies 40 are approximately equally spaced from each other when viewed macroscopically. The reinforcing members 40 are preferably arranged at approximately 10 pieces/mm to 60 pieces/mm in the circumferential direction of the tire.

As described above, the knitted body 36 may be formed by any knitting method as long as it is stretchable in the radial and circumferential directions of the tire 10, but as an example, it is formed by stockinette knitting. In other words, the primary molded body 34 in this disclosure has a so-called inlay structure in which a reinforcing fiber material is woven into the knitted body 36.

The shape of the knitted fabric body 36 is determined appropriately according to the specifications of the tire 10 to be manufactured, but is shaped to be disposed in the resin skeleton 20 from the bead core 18 to the crown portion 44 (see also Figures 5 and 8).

The resin coating of the bead core 18 and the knitted body 36 are made of materials that are compatible with each other, and the knitted body 36 and the resin coating of the bead core 18 can be welded together. For this reason, the bead core 18 in this embodiment is welded to the inner end of the knitted body 36 in the radial direction of the tire 10.

Next, the tire half body manufacturing method and tire manufacturing method according to the present disclosure will be described with reference to Figures 3 to 8 as appropriate. The tire half body manufacturing method according to the present disclosure includes a primary molding process, a fixing process, a mold clamping process, and an injection process.

(Primary molding process)
In the primary molding step, an annular bead core 18 is integrated with an inner end of the knitted layer 41 in the radial direction of the tire 10 to form a primary molded body.

(Fixation process)
5 is a diagram for explaining the state in which the primary formed body is arranged on the inner die 52 expanding in the radial direction. In the fixing process, the radially outer end of the primary formed body of the primary formed body is hung on the radially outer peripheral surface 52C of the inner die 52, and more specifically, as shown in FIG. 5, the primary molded body 34 is placed so as to cover the inner die 52 formed into a cylindrical shape by arranging a plurality of parts in the circumferential direction from one side in the axial direction (the right side in FIG. 5, the lower side in FIG. 6) to the other side in the axial direction (the left side in FIG. 5, the upper side in FIG. 6). In addition, the bead core 18 is located on one side in the axial direction of the inner die 52. As shown in Figure 5, the primary formed body is not fixed on the other axial side, and the primary molded body 34 is placed over the inner die 52 as the knitted body 36 shrinks in the axial and radial directions of the inner die 52, and remains aligned with the wall surface of the inner die 52 (the radial outer side of the circumferential surface 52C and the side surface 52S).

Note that on one axial side (inner side) of the inner mold 52, multiple slide molds 54 that can move further axially from the side surface 52S of the inner mold 52 toward one axial side are provided with gaps in the tire circumferential direction. As shown in FIG. 6, the slide mold 54 is recessed toward one axial side, and the bead core 18 is disposed in the recess of the slide mold 54. Note that, as shown in FIG. 7, in the portion of the inner mold 52 in the tire circumferential direction where the slide mold 54 is not disposed, the bead core 18 is disposed with a gap between it and the inner mold 52.

Although not shown in FIG. 5, an outer die 56 is disposed opposite the inner die 52 on one axial side of the inner die 52, covering the radial and axial sides of the inner die 52 and forming a gap.

(Mold clamping process)
Next, in the mold clamping process, a cavity C is formed using a peripheral surface 52C of the inner mold 52 and an outer mold 56 that faces the side surface 52S of the inner mold 52 with a gap therebetween. More specifically, from the state shown in FIG. 5, an outer mold 56 that covers the radial direction and one axial side of the inner mold 52 is brought closer to the inner mold 52 from one axial side, and a cavity C that is a gap is formed between the side surface 52S and peripheral surface 52C of the inner mold 52 and an inner surface 56I of the outer mold 56. In addition, by moving the slide mold 54 to one axial side in the state where the cavity C is formed, the bead core 18 is pressed against the inner surface 56I of the outer mold 56 as shown in FIG. 6. This cavity C has a shape equivalent to that of the tire half body 17A according to the present disclosure, and the tire half body 17A is formed by pouring a molten thermoplastic resin into the cavity C as described later.

In other words, in this disclosure, the radial direction, width direction, and circumferential direction of the inner mold 52 coincide with the radial direction, width direction, and circumferential direction of the tire 10, as shown in FIG. 1.

In the state shown in FIG. 6, a gate portion 58 for injecting thermoplastic resin (described later) is formed on one axial side of the inner mold 52, radially inward from the bead core 18.

As shown in FIG. 6, the knitted fabric body 36 of the primary molded body 34 is stretched in the axial and radial directions of the inner mold 52 while hung on the inner mold 52, so a contracting force acts on it, and it comes into contact with the inner mold 52 from the side surface 52S to the peripheral surface 52C inside the cavity C.

(Injection process)
Next, from the state shown in Fig. 6, molten thermoplastic resin is injected into the cavity C through the gate portion 58. In this case, since the gate portion 58 is provided radially inward of the bead cores 18 in the inner die 52, the knitted body 36 is pressed against the inner surface 56I of the outer die 56 in the cavity C by the molten thermoplastic resin injected through the gate portion 58, as shown in Fig. 8. Then, with the knitted body 36 pressed against the inner surface 56I of the outer die 56, the thermoplastic resin cools, forming the tire half body 17A in the cavity C.

In the tire half 17A of the present disclosure, as shown in FIG. 8, the knitted fabric body 36 is cooled in the cavity C while being pressed against the inner surface 56I of the outer mold 56. Therefore, the knitted fabric body 36 is integrated with the formed resin skeleton 20 in a state where it is located on the outer side of the tire. More specifically, in the side portion 42 of the resin skeleton 20 (one axial side of the resin skeleton 20), it is preferable that the knitted fabric body 36 is integrated with the resin skeleton 20 in a state where it is located on one axial side of a position 0.5 times the thickness of the side portion 42 of the resin skeleton 20. In addition, in the crown portion 16 of the tire 10 (radially outward of the resin skeleton 20), it is preferable that the knitted fabric body 36 is integrated with the resin skeleton 20 in a state where it is located radially outward of a position 0.5 times the thickness of the crown portion 16 of the resin skeleton 20.

Also, as shown in FIG. 8, the knitted body 36 is pressed against the inner surface 56I of the outer mold 56 in the cavity C, so that the knitted body 36 is integrated in a state in which it spreads outward in the radial direction of the tire 10 and outward in the circumferential direction of the tire 10. In other words, the reinforcing body 40 woven into the knitted body 36 is integrated with the resin skeleton 20 in a state in which it spreads out in the circumferential direction of the tire 10 of the tire half body 17A.

The above steps produce the tire half 17A disclosed herein.

Next, the tire manufacturing method will be described. The tire manufacturing method according to the present disclosure includes a rubber layer arrangement process, a joining process, a belt layer arrangement process, and a tread layer arrangement process.

(Rubber layer arrangement process)
In the rubber layer disposing step, a rubber layer 24 is disposed on one widthwise side of the pair of tire halves 17A manufactured by the above-described steps.

(Joining process)
In the joining process, in a pair of tire halves 17A on which the rubber layer 24 has been arranged by the above-mentioned process, end portions corresponding to the tire equatorial plane on the inner side in the width direction (opposite the direction in which the side portion 42 is formed) are joined together. As an example of a joining method, the other sides of the tire halves 17A are welded together via a resin material to form the tire frame member 17 as shown in FIG.

(Belt layer arrangement process)
In the belt layer disposing step, a circular belt layer 32 is disposed on the radially outer side of the tire 10 of the tire frame member 17 manufactured in the joining step. The belt layer 32 can be formed by winding the resin cord member 26 around the crown portion 44 of the tire frame member 17.

(Tread layer arrangement process)
In the tread layer disposing step, an annular tread layer is disposed on the radially outer side of the tire 10 of the tire frame member 17 manufactured in the belt layer disposing step.

As an example, the radially outer end of the knitted layer 41 extends to the crown portion 16 of the tire frame member 17 and overlaps with the belt layer 32. The amount of overlap with the belt layer 32 is preferably 5 mm or more from the end of the belt layer 32 in the width direction of the tire 10 toward the center in the width direction of the tire 10. The knitted layer 41 may also extend to the center in the width direction of the tire 10.

The above steps result in the tire 10 of this embodiment.

Next, the actions and effects obtained by the tire half 17A, tire 10, tire half manufacturing method, and tire manufacturing method of this disclosure will be described.

(Action and Effects)
The resin skeleton 20 of the tire half body 17A of this embodiment is formed by integrating a knitted layer 41 having a knitted body 36 with reinforcing members 40 evenly spaced around the tire 10, and the knitted layer 41 is integrated with the knitted body 36 using a thermoplastic resin.

As a result, with this tire half body 17A, the reinforcing members 40 can be arranged on the resin skeleton 20 in an evenly spaced manner in the circumferential direction of the tire 10, improving the durability of the tire half body 17A.

In addition, the resin skeleton 20 of this tire half body 17A has a knitted layer 41 that is arranged on the radial outside of the tire 10 in the resin skeleton 20 and integrated with the tire 10, and whose radial expansion is restricted by reinforcing members 40 that are evenly distributed around the tire 10. Therefore, the shape of the knitted layer 41 of the resin skeleton 20 of this tire half body 17A is unlikely to change even if the internal pressure of the tire 10 increases.

As a result, this tire half body 17A can improve the durability of the resin skeleton 20 compared to a tire half body 17A in which the knitted fabric layer 41 is positioned radially outside the tire 10 in the resin skeleton 20 and is not integrated.

In addition, in the tire half body 17A of this embodiment, the first fiber material 38 is compatible with the thermoplastic resin. As a result, according to the resin skeleton 20 of this tire half body 17A, the knitted fabric main body 36 is compatible and integrated with the resin skeleton 20 while melting, which reduces the possibility that the knitted fabric layer 41 will peel off from the resin skeleton 20, reducing the durability of the resin skeleton 20.

The tire 10 of this embodiment also has a pair of tire halves 17A, an annular belt layer 32 arranged on the radial outside of the pair of tire halves 17A, and a tread layer 30 arranged on the radial outside of the belt layer 32.

This tire 10 has the tire half body 17A of this embodiment. As a result, with this tire 10, it is possible to obtain a tire 10 in which the durability of the resin skeleton 20 is less likely to decrease, compared to a tire that does not have the tire half body 17A described in the embodiment.

In addition, according to the tire half body manufacturing method of this embodiment, the knitted layer 41 having the reinforcing members 40 evenly distributed in the circumferential direction is woven into the knitted body 36 having a folded mesh that is continuous in the circumferential and radial directions, so the knitted layer 41 is easy to stretch in the circumferential direction. Therefore, the primary formed body with the integrated knitted layer 41 can be easily manufactured by placing it on the inner mold 52 in the fixing process.

As a result, this tire half-body manufacturing method can reduce the effort required to manufacture a tire half-body 17A having a resin skeleton 20 with reinforcing members 40 evenly distributed in the circumferential direction.

In addition, in this tire half manufacturing method, the resin material is injected into the cavity C from one side in the axial direction relative to the bead core 18, so the knitted layer 41 is integrated with the resin skeleton 20 while being pressed against the inner surface 56I of the outer mold 56. As a result, the resin skeleton 20 formed by this tire half manufacturing method is integrated with the knitted layer 41 in a state in which the knitted layer is stretched outward in the radial and width directions of the tire half 17A. Therefore, even if the internal pressure of the tire 10 having the tire half 17A formed by this tire half manufacturing method increases, the shape of the knitted layer 41 is less likely to change.

As a result, this manufacturing method for the tire half 17A can provide a tire half 17A that improves the durability of the resin skeleton 20 compared to a manufacturing method for the tire half 17A in which the resin material is not injected into the cavity C from one axial side of the bead core 18.

In addition, the tire manufacturing method of this embodiment can reduce the effort required to manufacture a tire 10 having a tire half 17A that has a resin skeleton 20 with reinforcing members 40 evenly distributed in the circumferential direction.

(Modification)
In the above description, the first fiber material 38 is compatible with the thermoplastic resin constituting the tire half body 17A, but the technology according to the present disclosure is not limited to this. For example, even if the first fiber material 38 is not compatible with the thermoplastic resin, it is possible to obtain the tire half body 17A in which the reinforcing members 40 are evenly distributed in the circumferential direction of the tire 10, as in the above embodiment.

In the above description, the bead core 18 is resin-coated and welded to the knitted body 36 to form the primary molded body 34, but the technology of the present disclosure is not limited to this. For example, even if the bead core 18 does not have a resin coating and the knitted body 36 and the bead core 18 are not welded, the knitted body 36 is sandwiched between the bead core 18 and the outer mold 56 in the fixing process and the mold clamping process. This allows the tire half 17A and the knitted body 36 to be integrated, and even in this case, as in the above embodiment, a tire half 17A in which the reinforcing members 40 are evenly distributed in the circumferential direction of the tire 10 can be obtained.

In the above description, the knitted body 36 is integrated with the tire half body 17A while positioned on the outer side of the tire, but the technology according to the present disclosure is not limited to this. For example, the gate portion 58 may be provided radially outward of the bead core 18, and the thermoplastic resin may be injected from the outer side of the tire than the knitted layer 41, so that the knitted layer 41 is integrated with the tire inside. Even in this case, it is possible to obtain a tire half body 17A in which the reinforcing members 40 are evenly distributed in the circumferential direction of the tire 10, as in the above embodiment.

　The above describes the embodiments of the present disclosure with reference to the attached drawings, but it is clear that a person with ordinary knowledge in the technical field to which this disclosure pertains can conceive of various modifications and applications within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure.

The disclosure of Japanese Patent Application No. 2022-170195, filed on October 24, 2022, is incorporated herein by reference in its entirety.
All publications, patent applications, and standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or standard was specifically and individually indicated to be incorporated by reference.

Claims

a bead portion in which a bead core is embedded;
a knitted layer including: a knitted body formed of a first fiber material, having a folded mesh that is continuous in the tire circumferential direction and the tire radial direction, and being endless in the circumferential direction; and a reinforcing body formed of a reinforcing fiber material, knitted into the knitted body at equal intervals in the tire circumferential direction, and restricting elongation of the knitted body in the tire radial direction;
a resin skeleton formed of a thermoplastic resin, the knitted fabric layer being integrally disposed from the bead portion to the crown portion;
A tire half comprising:
The first fiber material is compatible with the thermoplastic resin.
The tire half of claim 1 .
The knitted layer is located on the outer side of the tire in the resin skeleton.
The tire half of claim 1 .
A tire frame member formed by a pair of tire half bodies according to any one of claims 1 to 3;
a circular belt layer disposed on an outer side of the tire frame member in the tire radial direction;
A tread layer disposed on the outer side of the belt layer in the tire radial direction;
A tire having
a knitted body formed of a first fiber material, having a folded-back mesh formed continuously in the tire circumferential direction and the tire radial direction, having ends on both sides in the tire radial direction and being endless in the tire circumferential direction; and a reinforcing body formed of a reinforcing fiber material, knitted into the knitted body at equal intervals in the tire circumferential direction and restricting extension of the knitted body in the tire radial direction, and a primary formed body is formed by integrating an annular bead core with an inner end portion in the tire radial direction of a knitted layer having the knitted body;
While holding the bead core of the primary formed body at an end portion on the inside in the radial direction of the inner mold, the knitted layer is placed along a wall surface of the inner mold;
forming a cavity using an outer mold opposed to the wall surface of the inner mold with a gap therebetween;
A resin material is injected into the cavity from a position inside the inner mold in the tire axial direction relative to the bead core, and a resin skeleton is formed while pressing the primary molded body against the outer mold.
A method for manufacturing half tyres.
A pair of tire halves manufactured by the tire half manufacturing method according to claim 5 are joined together,
a circular belt layer is disposed on an outer side in the tire radial direction of the tire frame member manufactured by the joining;
a tread layer disposed on the tire frame member radially outward of the belt layer.