WO2019244851A1 - Pneumatic tire - Google Patents

Abstract

A pneumatic tire comprising a pair of bead cores, a carcass straddling from one side of the pair of bead cores to the other side, a resin belt, and a tread formed on the outside of the resin belt in the tire radial direction. The resin belt: is formed using resin-coated cords, being cords coated in resin, that are spirally wound on the outside of the carcass in the tire radial direction; has a belt main body wherein the resin of resin-coated cords adjacent in the tire width direction is integrally bonded; and has an inclined wound section that is formed on the outside of the belt main body in the tire width direction and is wound having a gap between same and the belt main body in the tire width direction.

Description

Pneumatic tire

The present disclosure relates to a pneumatic tire including a resin belt configured to include a spirally wound cord.

Japanese Patent Application Laid-Open No. 2013-244930 discloses that as a pneumatic tire to be mounted on an automobile, two or more inclined resin belt plies configured to include a cord inclined outward in the tire radial direction of the carcass with respect to the tire circumferential direction. And a resin belt having a plurality of layers including a reinforcing layer and the like disposed outside the inclined resin belt ply in the tire radial direction.

Since a pneumatic tire is provided with two or more inclined resin belt plies and a reinforcing layer, it is possible to secure in-plane shear rigidity and the like necessary for reinforcing a crown portion of a carcass. Since the number of layers is large, it is difficult to reduce the weight of the tire.
In recent years, needs such as weight reduction of pneumatic tires have been increasing, and pneumatic tires corresponding thereto have been demanded.

The present disclosure has been made in consideration of the above-described facts, and has as its object to provide a pneumatic tire that secures in-plane shear rigidity and that meets the need for weight reduction.

The pneumatic tire according to the present disclosure includes a pair of bead cores, a carcass straddling from one of the pair of bead cores to the other, and a resin-coated cord formed by coating a cord with a resin on a tire radial outside of the carcass. A belt body portion formed by being spirally wound and integrally joining the resins of the resin-coated cords adjacent to each other in the tire width direction; and the belt formed outside the belt body portion in the tire width direction. It comprises a resin belt having a main body portion and an inclined winding portion wound at an interval in the tire width direction, and a tread formed on the resin belt in the tire radial direction outside.

This pneumatic tire has a resin belt on the outside of the carcass in the tire radial direction. With the resin belt, in-plane shear rigidity can be ensured and the weight can be reduced. The resin belt is formed by spirally winding a resin-coated cord formed by coating a cord with a resin, and the resins of the resin-coated cords adjacent in the tire width direction are integrally joined. It has a belt body and an inclined winding portion formed outside the belt body in the tire width direction and wound around the belt body at an interval in the tire width direction. Since the inclined winding portion is wound around the belt main body at an interval in the tire width direction, the rigidity is lower than that of the belt main body.
Accordingly, by reducing the rigidity of the resin belt on the outer side in the tire width direction, the rigidity difference on the outer side of the resin belt in the tire width direction can be reduced.
Thereby, stress concentration on the outer side in the tire width direction of the resin belt can be suppressed.

As described above, according to the pneumatic tire of the present invention, it is possible to secure in-plane shear rigidity and reduce the weight.

It is a sectional view along the tire rotation axis showing the pneumatic tire concerning a 1st embodiment of the present invention. It is an expanded sectional view showing the neighborhood of the shoulder of the pneumatic tire concerning a 1st embodiment. It is the top view which looked at the arrangement state of the 1st slope winding part and the 2nd slope winding part of the resin coat cord of the pneumatic tire concerning a 1st embodiment from the tire radial direction. It is the top view seen from the tire radial direction which shows the reinforcement member which covers the 2nd inclined winding part of the pneumatic tire concerning a 2nd embodiment. It is an expanded sectional view showing near a shoulder of a pneumatic tire concerning a modification. It is an expanded sectional view showing near a shoulder of a pneumatic tire concerning a comparative example. It is the top view which looked at the state of the winding end part of the resin coating cord of the pneumatic tire concerning a comparative example from the tire radial direction.

<First embodiment>
A pneumatic tire 10 according to one embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the pneumatic tire 10 of the present embodiment is, for example, a so-called run flat radial tire used for a passenger car, and includes a pair of bead portions 20 in which a bead core 12 is embedded. Has a carcass 16 extending from one side to the other side.
The carcass 16 is formed as one carcass ply 14.

The carcass ply 14 is formed by coating a plurality of cords (not shown) extending in the radial direction of the pneumatic tire 10 with a coating rubber (not shown). That is, the pneumatic tire 10 of the present embodiment is a so-called radial tire. The cord material of the carcass ply 14 is, for example, PET, but may be another known material.

The end portion of the carcass ply 14 in the tire width direction has the bead core 12 folded back in the tire radial direction. In the carcass ply 14, a portion extending from one bead core 12 to the other bead core 12 is referred to as a main body portion 14A, and a portion folded from the bead core 12 is referred to as a folded portion 14B.

Bead fillers 18 whose thickness gradually decreases from the bead core 12 to the outside in the tire radial direction are disposed between the main body portion 14A and the folded portion 14B of the carcass ply 14. In the pneumatic tire 10, a portion of the bead filler 18 from the tire radial outer end 18 </ b> A to the tire radial direction inside is a bead portion 20.

An inner liner 22 made of rubber is arranged inside the tire of the carcass 16, and a side rubber layer 24 made of a rubber material is arranged outside the carcass 16 in the tire width direction.
On the inner side of the tire of the inner liner 22, the reinforcing rubber extends from a position overlapping the tire radial outer end 18A of the bead filler 18 in the tire width direction to a position overlapping the inclined winding portion 26B of the resin belt 26 described later in the tire radial direction. A layer 28 is provided.

[Resin belt]
A resin belt 26 is disposed outside the crown portion of the carcass 16, in other words, outside the carcass 16 in the tire radial direction, and the resin belt 26 is in close contact with the outer peripheral surface of the carcass 16.

As shown in FIG. 2, the resin belt 26 is formed by spirally winding a resin-coated cord 34 formed by covering a plurality of (two in this embodiment) reinforcing cords 30 with a resin 32. I have.
The resin belt 26 is manufactured by welding the resin-coated cords 34 adjacent to each other with a heater (not shown) while spirally winding the resin-coated cords 34 around the outer peripheral surface of a resin-belt forming drum (not shown).

The resin-coated cord 34 has an inner peripheral surface 34A that forms an inner surface in the tire radial direction, and an outer peripheral surface 34B that forms an outer surface in the tire radial direction.
The resin belt 26 includes a belt body 26A to which the resin 32 of the resin-coated cords 34 adjacent in the tire width direction are integrally joined, and a belt body 26A formed outside the belt body 26A in the tire width direction. And an inclined winding portion 26B wound at intervals in the tire width direction.
Further, a tread 36 is formed outside the resin belt 26 in the tire radial direction.

As shown in FIG. 3, the inclined winding portion 26B is a first inclined winding that is gradually separated outward from the resin-coated cord 34 on the outer side in the tire width direction of the belt body 26A in the tire width direction and is wound in the tire circumferential direction. A second inclined winding having a winding end portion 34E that is continuously wound around the winding portion 26B1 and the first inclined winding portion 26B1 in the tire circumferential direction, and gradually approaches the first inclined winding portion 26B1. And a turning portion 26B2.
Further, the winding end portion 34E has an end surface 34E1 orthogonal to the winding direction of the second inclined winding portion 26B2 and the outer peripheral surface 34B.

Specifically, the inclined winding portions 26B are formed on both outer sides of the belt body 26A in the tire width direction.
In the present embodiment, the first inclined winding portion 26B1 is disposed in the tire circumferential direction so as to gradually separate outward from the resin-coated cord 34 located at the outer end in the tire width direction of the belt body 26A in the tire width direction. It is wound in a range of about one round.
The second inclined winding portion 26B2 is continuously wound around the first inclined winding portion 26B1 in a range of about 1/4 of the tire circumferential direction along the tire circumferential direction. Has a winding end portion 34 </ b> E that gradually approaches.

In other words, the first inclined winding portion 26B1 is wound in the tire circumferential direction while being separated from the end in the tire width direction of the belt body 26A to the outside in the tire width direction.
Further, since the second inclined winding portion 26B2 is wound along the tire circumferential direction continuously from the first inclined winding portion 26B1, the direction of the first inclined winding portion 26B1 when viewed from the tire radial direction. It is wound so as to return relatively to. Thus, the winding end portion 34E approaches the first inclined winding portion 26B1.

The winding end 34E of the second inclined winding portion 26B2 is joined to the first inclined winding portion 26B1.
Specifically, since the second inclined winding portion 26B2 is wound close to the first inclined winding portion 26B1 as described above, the tire at the winding end 34E of the second inclined winding portion 26B2 is used. The inner surface in the width direction is in contact with the outer surface in the tire width direction of the first inclined winding portion 26B1, and is joined by welding.
As a means for this bonding, bonding may be performed using an adhesive, instead of welding.

Here, the resin-coated cord 34 will be specifically described.
The reinforcing cord 30 of the resin-coated cord 34 is preferably thicker than the cord of the carcass ply 14 and has a large strength (tensile strength). The reinforcing cord 30 of the resin belt 26 can be constituted by a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (stranded wire) obtained by twisting these fibers. The reinforcing cord 30 of the present embodiment is a steel cord. As the reinforcing cord 30, for example, a steel cord of “1 × 5” having a diameter of 0.225 mm can be used, but a steel cord having another conventionally known structure can also be used.

(4) As the resin 32 for covering the reinforcing cord 30, a rubber material constituting the side rubber layer 24 and a resin material having a higher tensile modulus than a rubber material constituting the tread 36 described later are used. As the resin 32 that covers the reinforcing cord 30, a thermoplastic resin having elasticity, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used. Considering the elasticity during running and the moldability during manufacturing, it is desirable to use a thermoplastic elastomer.

Examples of the thermoplastic elastomer include polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), and polyester-based thermoplastic elastomer (TPC). And dynamically crosslinked thermoplastic elastomers (TPV).

Further, examples of the thermoplastic resin include a polyurethane resin, a polyolefin resin, a vinyl chloride resin, and a polyamide resin. Further, as the thermoplastic resin material, for example, the deflection temperature under load (under a load of 0.45 MPa) specified in ISO75-2 or ASTM D648 is 78 ° C. or more, and the tensile yield strength specified in JIS K7113 is 10 MPa. As described above, a material having a tensile elongation at break specified in JIS K 7113 of 50% or more and a Vicat softening temperature (A method) specified in JIS K 7206 of 130 ° C. or more can be used.

引 張 The tensile modulus of elasticity of the resin 32 that covers the reinforcing cord 30 (defined by JIS K7113: 1995) is preferably 50 MPa or more. The upper limit of the tensile modulus of the resin 32 covering the reinforcing cord 30 is preferably 1000 MPa or less. The tensile modulus of the resin 32 covering the reinforcing cord 30 is particularly preferably in the range of 200 to 500 MPa.

In addition, it is preferable that the thickness of the resin-coated cord 34 of this embodiment is larger than the diameter of the reinforcing cord 30. In other words, it is preferable that the reinforcing cord 30 is completely embedded in the resin 32. When the pneumatic tire 10 is for a passenger vehicle, the thickness dimension of the resin belt 26 is preferably set to 0.70 mm or more.

ト A tread 36 is disposed outside the resin belt 26 in the tire radial direction. As the rubber material used for the tread 36, a conventionally well-known rubber material is used. A groove 37 for drainage is formed in the tread 36. Further, the tread 36 has a conventionally known pattern.

幅 It is preferable that the width BW of the resin belt 26 measured along the tire axial direction is 75% or more with respect to the contact width TW of the tread 36 measured along the tire axial direction. Note that the upper limit of the width BW of the resin belt 26 is preferably set to 110% with respect to the contact width TW.

Here, the contact width TW of the tread 36 means that the pneumatic tire 10 is mounted on a standard rim stipulated in JATMA YEAR BOOK (2018 edition, Japan Automobile Tire Association Standard) and the applicable size in JATMA YEAR BOOK. Fills with 100% internal pressure of the air pressure (maximum air pressure) corresponding to the maximum load capacity (the bold load in the internal pressure-load capacity correspondence table) in the ply rating, and the rotation axis is parallel to the horizontal flat plate in a stationary state And a mass corresponding to the maximum load capacity is added. When the TRA standard and the ETRTO standard are applied at the place of use or the place of manufacture, the respective standards are followed.

樹脂 Further, the in-plane shear rigidity of the resin belt 26 is preferably equal to or greater than that of a steel cord covered with rubber.

[Action, effect]
(Comparative example)
Here, a pneumatic tire 110 of a comparative example will be described with reference to FIGS. The same components as those of the first embodiment will be described by adding 100 to the reference numerals.

As shown in FIGS. 6 and 7, the resin belt 126 is welded by contacting side surfaces of all the resins 132 adjacent to each other in the tire axial direction up to the winding end portion 134E of the resin-coated cord 134.
Therefore, the end portion 134E of the resin-coated cord 134 has a step at the end surface 134E1 of the winding end portion 134E in the tire circumferential direction. In other words, a member corresponding to the thickness of the resin belt 126 does not exist before the end surface 134E1 of the winding end portion 134E in the winding direction.

In such a resin belt 126, a large rigidity step occurs at the winding end portion 134 </ b> E of the resin belt 126 due to the step of the end surface 134 </ b> E <b> 1 of the winding end portion 134 </ b> E of the resin-coated cord 134.
In other words, since the adjacent resin-coated cords 134 are all welded to the winding end 134E, a portion at the end of the end surface 134E1 of the winding end 134E in the winding direction for suppressing the rigidity step is provided. The member does not exist. For this reason, the rigidity sharply decreases at the site.
As described above, in the present comparative example, the rigidity sharply decreases at the positions of the winding ends 134E on both outer sides in the tire width direction of the resin belt 126, and a large rigidity step occurs.

In the pneumatic tire 110 using the resin belt 126 in this comparative example, the stress concentration on the outer side in the tire radial direction of the resin belt 126 is conspicuous. It becomes uneven in the direction, and as a result, the ride quality deteriorates.

On the other hand, the pneumatic tire 10 according to the present embodiment has the following operation and effects.
In the present embodiment, as shown in FIG. 3, an inclined winding portion 26B is formed on the outer side of the resin belt 26 in the tire width direction, and the inclined winding portion 26B is formed on the outer end of the belt body 26A on the tire width direction. It is wound in the tire circumferential direction so as to gradually separate outward from the resin coating cord 34 located in the tire width direction, and is wound with a space between the belt main body portion 26A and the inclined winding portion 26B. I have.
In other words, a portion where the resin-coated cord 34 does not exist is formed between the belt body 26A and the inclined winding portion 26B.
Thereby, the rigidity of the inclined winding portion 26B of the resin belt 26 in the tire width direction becomes smaller than that of the belt main body portion 26A.
Thus, the rigidity step is reduced outside the resin belt 26 in the tire width direction, so that stress concentration on the resin belt 26 outside the tire width direction can be suppressed.
The resin belt 26 is formed by spirally winding a resin-coated cord 34 formed by coating a plurality of (two in the present embodiment) reinforcing cords 30 with a resin 32, so that the in-plane It is possible to secure the shear rigidity and reduce the weight.

The inclined winding portion 26B is wound along the tire circumferential direction continuously from the first inclined winding portion 26B1 and the first inclined winding portion 26B1, and the gap between the first inclined winding portion 26B1 and the first inclined winding portion 26B1 is provided. And a second inclined winding portion 26B2 having a gradually approaching winding end portion, whereby the first inclined winding portion 26B1 is located ahead of the end surface 34E1 of the winding end portion 34E in the belt winding direction. Therefore, the rigidity step in the tire circumferential direction near the end face 34E1 is reduced.
Further, since the second inclined winding portion has a winding end portion that gradually approaches the first inclined winding portion, the first inclined winding portion and the second inclined winding portion have a tire width. In the portions adjacent to each other in the direction, the rigidity step of the resin belt in the tire circumferential direction is reduced, and the stress on the inclined winding portion 26B can be dispersed.
As a result, it is possible to suppress the variation in the rotational resistance of the tire and improve the riding comfort when the vehicle is running.

Further, by joining the winding end portion 34E of the second inclined winding portion 26B2 to the first inclined winding portion 26B1, it is possible to suppress displacement of the winding end portion 34E of the wound resin-coated cord 34. it can.

<Second embodiment>
Next, a pneumatic tire 10 according to a second embodiment of the present invention will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the pneumatic tire 10 according to the second embodiment has a winding end 34E including a reinforcing member 35 that covers a tire radial outside 34B of the winding end 34E.
In the present embodiment, the reinforcing member 35 is a layer including a fiber or a cord.
The reinforcing member 35 covers a predetermined dimension from the end surface 34E1 of the outer peripheral surface 34B of the winding end portion 34E and a width dimension larger than the width of the resin-coated cord 34 in the tire width direction, and extends in the winding direction of the end surface 34E1. It is a planar layer having a predetermined thickness and a length dimension capable of covering at least a part of the outer peripheral surface 34B of the first inclined winding portion 26B1 disposed ahead.
In the present embodiment, the reinforcing member 35 is a rectangular layer whose length is set in the winding direction of the resin-coated cord.

Specifically, a part of the outer peripheral surface 34B of the winding end portion 34E of the second inclined winding portion 26B2 and the outer peripheral surface of the first inclined winding portion 26B1 arranged in a direction in which the end surface 34E1 of the winding end portion 34E faces. A part of 34B is covered with the reinforcing member 35.

In the present embodiment, the reinforcing member 35 is connected to the winding end 34E in a range from 0 mm to 40 mm.
Specifically, the reinforcing member 35 covers the outer peripheral surface 34B of the winding end 34E by about 10 mm from the end surface 34E1. The side opposite to the winding end 34E of the reinforcing member 35 covers a part of the outer peripheral surface 34B of the first inclined winding portion 26B1 arranged in the direction in which the end surface 34E1 of the winding end 34E faces.

In this way, by covering the winding end 34E and the first inclined winding portion 26B1 with the reinforcing member 35, the end surface 34E1 of the winding end 34E and the outside of the first inclined winding portion 26B1 in the tire width direction are formed. Is covered from the tire radial direction outside.
Thereby, the rigidity step of the winding end portion 34E of the resin belt 26 can be further reduced.

<Modification>
Next, a pneumatic tire 10 according to a modified example will be described. Note that the same components as those of the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIG. 5, the pneumatic tire 10 according to the modified example includes a resin layer 33 that is disposed inside the resin belt 26 in the tire radial direction and that is integrally joined to a resin-coated cord 34.

Specifically, a resin layer 33 made of only a resin material is provided between the resin belt 26 and the carcass 16, and the resin material forming the resin layer 33 and the resin 32 of the resin belt 26 are joined by welding. It is integrated.

In manufacturing the resin belt 26 of this modified example, a cylindrical resin layer 33 is arranged on the outer periphery of a resin belt forming drum (not shown), and the resin coating cord 34 is formed by melting the surface of the resin 32 on the outer peripheral surface of the resin layer 33. Is spirally wound. Thus, the resin layer 33 and the resin 32 of the resin-coated cord 34 can be integrated by joining, for example, by welding.

In the pneumatic tire 10 of this modification, the resin layer 33 is integrated with the resin belt 26 and the resin portion is thickened, so that the in-plane shear rigidity of the resin belt 26 can be further increased. Further, since the resin-coated cords 34 adjacent to each other are joined by welding not only between the side surfaces but also via the resin layer 33, high joining strength can be obtained.

(4) The same resin material as the resin 32 of the resin belt 26 can be used as the resin material forming the resin layer 33, but the resin layer 33 only needs to be welded to the resin 32 of the resin belt 26. For example, the same resin material as the resin 32 but different in hardness may be used, and a different resin material from the resin 32 may be used.

Although not shown, the resin layer 33 has a width wider than the width of the resin belt 26 around which the resin-coated cord 34 is spirally wound, and protrudes from the end of the resin-coated cord 34 in the tire width direction. It may be something.
With this configuration, a portion of only the resin whose rigidity is lower than that of the resin belt 26 is formed at the end of the resin belt 26 made of the highly rigid resin-coated cord 34, and the rigidity difference is easily reduced. The portion of the resin belt 26 projecting outward in the tire width direction from the second inclined winding portion 26B2, which is the end portion in the tire width direction, and the resin coating cord 34 of the resin layer 33 are covered with, for example, two layers. You may.

In the present modification, the resin-coated cord 34 is spirally wound around the outer peripheral surface of the annular resin layer 33, so that the resin-coated cord 34 is directly wound around the outer peripheral surface of the resin belt forming drum. When the resin-coated cord 34 formed by winding is removed from the outer peripheral surface of the resin belt forming drum, the inclined winding portion 26B is arranged at a predetermined position.

[Other embodiments]
As described above, one embodiment of the present invention has been described. However, the embodiment of the present invention is not limited to the above, and other than the above, various modifications can be made without departing from the gist of the present invention. Of course.

In the above-described embodiment and modifications, the second inclined winding portion 26B2 is wound so as to approach the first inclined winding portion 26B1, but the performance such as the riding comfort set for the pneumatic tire 10 is taken into consideration. Then, the second inclined winding portion 26B2 may be wound in parallel with the first inclined winding portion 26B1. Further, the second inclined winding portion 26B2 may be wound further away from the first inclined winding portion 26B1, or the second inclined winding portion 26B2 may be brought closer to the first inclined winding portion 26B1. Even if it is wound, the winding end portion 34E may not be joined to the first inclined winding portion 26B1.

Further, the winding range of the first inclined winding portion 26B1 and the second inclined winding portion 26B2 in the tire circumferential direction is such that the first inclined winding portion 26B1 is about one turn in the tire circumferential direction, and the second inclined winding portion 26B1 is the second inclined winding portion. It has been described that the portion 26B2 is about １ ／ of the tire circumferential direction.
However, the present invention is not limited thereto, and the first inclined winding portion 26B1 may have a length of about half a circumference in the tire circumferential direction, and the second inclined winding portion 26B2 may have a length of about a half circumference in the tire circumferential direction.
The winding range of the first and second inclined winding portions in the tire circumferential direction is determined by the type of the pneumatic tire to be manufactured (comfort-oriented tire or sports-oriented tire, etc.) or the riding comfort required for the pneumatic tire to be manufactured. It is not limited to the characteristics, and can be appropriately set in consideration of straight running stability, handling characteristics, fuel consumption characteristics, and the like.

In addition, the size of the space formed between the first inclined winding portion 26B1 and the belt body 26A, and the size of the space formed between the first inclined winding portion 26B1 and the second inclined winding portion 26B2. Can be appropriately dimensioned in consideration of the rigidity step set outside the resin belt 26 in the tire width direction.

Further, although the winding ends 34E arranged on both sides on the outer side in the tire width direction are illustrated and described as being arranged in the tire circumferential direction, the winding ends 34E are arranged at positions shifted from each other in the tire circumferential direction. You may. For example, it may be shifted by 180 ° in the tire circumferential direction.

Further, the reinforcing member 35 is a layer that covers the winding end portion 34E and the first inclined winding portion 26B1, and has been described as a rectangular shape. However, the shape of the layer is not limited to the rectangular shape, and may be another shape.
In addition, the reinforcing member 35 covers a part of each of the winding end 34E and the first inclined winding part 26B1, but the reinforcing member 35 covers the entire inclined winding part 26B including the part. It may be.

Although the reinforcing member 35 is described as a layer that covers the winding end 34E and the first inclined winding portion 26B1, it may be a resin body that is connected to the end surface 34E1 of the winding end 34E.

In the above embodiments and modifications, the pneumatic tire 10 has been described as a run-flat tire, but a normal pneumatic tire without a reinforcing rubber layer specific to a run-flat tire may be used.

In the above embodiment and the modified example, the resin-coated cord 34 used when manufacturing the resin belt 26 is obtained by covering the two reinforcing cords 30 with the resin 32. However, the resin-coated cord 34 may be one in which one reinforcing cord 30 is covered with the resin 32, or three or more reinforcing cords 30 may be covered with the resin 32.

The resin-coated cord 34 of the above embodiment and the modified example has a rectangular cross-sectional shape, and as shown in FIG. 2, the inner peripheral surface 34A on the carcass 16 side (the lower side in the drawing) and the tread 36 side (the upper side in the drawing). Although the outer peripheral surface 34B is not displaced in the width direction of the resin belt, the cross section of the resin-coated cord 34 is not limited to a rectangle, and the inner peripheral surface 34A on the carcass side and the outer peripheral surface 34B on the tread 36 side are The resin belt may be displaced in the width direction (for example, the cross-sectional shape is a parallelogram).

The disclosure of Japanese Patent Application No. 2018-115414 filed on June 18, 2018 is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards mentioned herein are to the same extent as if each individual document, patent application, and technical standard were specifically and individually stated to be incorporated by reference. Incorporated herein by reference.

Claims (5)

A pair of bead cores,
A carcass straddling from one of the pair of bead cores to the other,
On the outside of the carcass in the tire radial direction, a resin-coated cord formed by coating a cord with a resin is spirally formed and the resin of the resin-coated cords adjacent in the tire width direction is integrally formed. A belt body to be joined;
A resin belt having an inclined winding portion formed outside the belt main body in the tire width direction and wound at an interval in the tire main body and the tire width direction,
A tread formed on the tire belt outer side in the tire radial direction of the resin belt,
Pneumatic tire with. A first inclined winding portion that is gradually separated outward in the tire width direction from the resin-coated cord on the outer side in the tire width direction of the belt body and is wound in the tire circumferential direction; 2. A second inclined winding portion having a winding end portion wound continuously along the tire circumferential direction following the inclined winding portion and gradually approaching the gap between the first inclined winding portion. A pneumatic tire according to claim 1. The pneumatic tire according to claim 2, wherein the winding end is joined to the first inclined winding part. The pneumatic tire according to claim 2 or 3, further comprising a reinforcing member that covers a radially outer side of the winding end. The pneumatic tire according to any one of claims 1 to 4, further comprising a resin layer disposed inside the resin belt in the tire radial direction and integrally joined with the resin-coated cord.

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