WO2019244788A1

WO2019244788A1 - Tire

Info

Publication number: WO2019244788A1
Application number: PCT/JP2019/023638
Authority: WO
Inventors: 鈴木　隆弘; 正之有馬
Original assignee: 株式会社ブリヂストン
Priority date: 2018-06-18
Filing date: 2019-06-14
Publication date: 2019-12-26
Also published as: JP2019217843A

Abstract

This tire is provided with: a tire skeleton member formed by including a carcass; a tread formed from a rubber material; a resin reinforcement body which is provided between the tire skeleton member and the tread, and is formed from a resin material, and in which a reinforcement cord wound in the tire circumferential direction is embedded. In the resin reinforcement body, outer regions each of which is a 25% region from the corresponding outer end in the tire width direction, have an average thickness dimension that is larger than the average thickness dimension of a center region which is the remaining region.

Description

tire

The present disclosure relates to a tire.

The tire disclosed in Patent Document 1 has an annular belt outside the tire frame member, and the annular belt is formed by spirally winding a resin-coated cord formed by coating a reinforcing cord with a resin. Is formed.

JP 2014-210487 A

タイヤ In the tire as described above, in order to improve the cornering power, it is conceivable to increase the thickness of the belt by increasing the thickness of the resin-coated cord to increase the rigidity. However, there is a problem that simply increasing the thickness of the belt deteriorates ride comfort.

The present disclosure aims to improve cornering power while suppressing a decrease in ride comfort.

The tire according to the first aspect is provided with a tire frame member including a carcass, a tread formed of a rubber material, and a resin material provided between the tire frame member and the tread. And a resin reinforcement body in which a reinforcement cord wound in the tire circumferential direction is embedded, wherein the resin reinforcement body is located outside in the tire width direction when the entire tire width direction of the resin reinforcement body is taken as 100%. A tire in which an average thickness dimension of an outer region which is a region 25% from an end is larger than an average thickness size of a central region which is another region.

タイヤ In the tire according to the first aspect, a resin reinforcement body made of a resin material and embedded with a cord wound in the tire circumferential direction is provided between the tire frame member and the tread. Thereby, the rigidity of (the crown portion of) the tire frame member is increased.

Here, the resin reinforcing body is formed such that the average thickness dimension of the outer region (the region 25% from the outer end in the width direction) is larger than the average thickness size of the central region (the region other than the outer region). ing. For this reason, the outer portion of the crown portion in the tire width direction is mainly increased in rigidity, and as a result, the cornering power is improved. Further, compared to a mode in which the overall thickness of the resin reinforcement in the tire width direction is increased, the rigidity of the central portion in the tire width direction in the crown portion is suppressed, and as a result, the reduction in ride comfort is suppressed. .

According to the present disclosure, it is possible to improve cornering power while suppressing a decrease in ride comfort.

It is a sectional view (cross section which passes along a tire rotation axis) showing a tire concerning an embodiment. It is an expanded sectional view showing the resin reinforcement of a 1st embodiment. It is a sectional perspective view showing an example of a manufacturing method of a belt (spiral belt layer). It is an expanded sectional view showing the resin reinforcement of a 2nd embodiment, (A) shows the section in the manufacturing process, and (B) shows the section in the tire completion state. It is sectional drawing which shows the resin reinforcement of 3rd Embodiment.

Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the drawings. In the drawings, an arrow R direction indicates a tire radial direction, and an arrow W direction indicates a tire width direction. The tire radial direction means a direction orthogonal to the tire rotation axis (not shown). The tire width direction means a direction parallel to the tire rotation axis. The tire width direction can also be referred to as the tire axial direction. In the drawings, CL indicates the tire equatorial plane.

[First Embodiment]
The tire 10 according to the first embodiment will be described with reference to FIGS.

タイヤ As shown in FIG. 1, the tire 10 includes a pair of bead portions 20 in which the bead cores 12 are embedded. A carcass 16 composed of one carcass ply 14 straddles between one bead portion 20 and the other bead portion 20. FIG. 1 shows the shape of the tire 10 in a natural state before air filling.

The carcass ply 14 is formed by coating a plurality of cords (not shown) extending in the radial direction of the tire 10 with a coating rubber (not shown). That is, the 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 has the bead core 12 folded back in the tire radial direction. A portion of the carcass ply 14 that extends from one bead core 12 to the other bead core 12 is called a main body portion 14A, and a portion that is folded back from the bead core 12 is called 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. Note that, in the tire 10, a portion inside the tire radial direction from the tire radial outer end 18 </ b> A of the bead filler 18 is a bead portion 20.

An inner liner 22 made of a rubber material 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.

The tire core member 25, which forms the skeleton of the tire 10, is formed by the bead core 12, the carcass 16, the bead filler 18, the inner liner 22, and the side rubber layer 24.

It can be said that the tire frame member 25 includes a pair of bead portions 20, a pair of side portions, and a crown portion. The side part is a part that forms the side part of the tire 10 and is gently curved so as to protrude outward from the bead part 20 toward the crown part in the tire rotation axis direction. The crown portion is a portion that connects the pair of side portions to each other in the tire width direction, and is a portion that supports a tread 36 described later.

(belt)
An annular belt 26 is arranged outside the crown portion of the tire frame member 25, in other words, outside the carcass 16 in the tire radial direction. The belt 26 is joined to the outer peripheral surface of the carcass 16. As shown in FIGS. 2 and 3, the belt 26 is formed by spirally winding a resin-coated cord 34 in which two reinforcing cords 30 are covered with a resin 32. The method of manufacturing the belt 26 will be described later.

It is preferable that the reinforcing cord 30 of the belt 26 is thicker than the cord of the carcass ply 14 and has high strength (tensile strength). The reinforcing cord 30 of the belt 26 can be composed of 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 “1 × 5” steel cord 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.

(tread)
A tread 36 made of a rubber material is disposed outside the belt 26 in the tire radial direction via a cushion rubber (not shown). As the rubber material used for the tread 36, a conventionally 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 (width dimension measured along the tire width direction) of the belt 26 is 75% or more with respect to the contact width TW of the tread 36 measured along the tire width direction. In addition, it is preferable that the width BW of the belt 26 be 110% or less with respect to the contact width TW.

Here, the contact width TW of the tread 36 means that the tire 10 is mounted on a standard rim specified in JATMA YEAR BOOK (2018 edition, Japan Automobile Tire Association Standard), and the applicable size and ply rating in JATMA YEAR BOOK 100% internal pressure of the air pressure (maximum air pressure) corresponding to the maximum load capacity (bold load in the internal pressure-load capacity correspondence table), so that the rotation axis is parallel to the horizontal flat plate in the stationary state It is the one when placed and the 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.

(Resin plate)
As shown in an enlarged manner in FIG. 2, a resin plate 35 is joined to an outer portion in the width direction of the belt 26 (in FIG. 1, illustration of the resin plate 35 is omitted). A total of four resin plates 35 are provided, each of which is provided in an annular shape around the tire rotation axis, similarly to the belt 26. That is, the resin plate 35 is arranged with the tire radial direction as the plate thickness direction. The four resin plates 35 are provided on the outer side in the tire radial direction and the inner side in the tire radial direction on one side in the width direction of the belt 26 (left side in FIG. 2), and on the other side in the width direction of the belt 26 (right side in FIG. 2). It is joined to each of four locations on the tire radial outside and the tire radial inside. Specifically, the resin plate 35 is joined to the resin 32 portion of the belt 26 by welding. The position of the outer end of the resin plate 35 in the tire width direction substantially coincides with the position of the outer end of the belt 26 in the tire width direction. Therefore, the resin plate 35 has no portion protruding outward in the tire width direction with respect to the belt 26.
Note that, in the present embodiment, the structure in which the resin plate 35 does not protrude outward in the tire width direction with respect to the belt 26 is illustrated. Alternatively, the belt 26 may protrude outward in the tire width direction. In this case, the effect of reducing the widthwise rigidity step at the belt end is exhibited.

クラウン The crown portion of the tire frame member 25 is reinforced by the belt 26 and the resin plate 35. In other words, the tire 10 includes the resin reinforcement 31 that reinforces the tire frame member 25, and the resin reinforcement 31 includes the belt 26 and the resin plate 35.

As described above, the belt 26 is formed by spirally winding the resin-coated cords 34 having the same cross section (rectangular cross section in the present embodiment), so that the thickness dimension of the belt 26 is in the width direction of the belt 26. Is substantially constant irrespective of the position. Therefore, the thickness dimension of the resin reinforcing body 31 is thicker in the portion where the resin plate 35 is joined than in the portion where the resin plate 35 is not joined. That is, it can be said that the resin reinforcing body 31 includes a thin portion where the resin plate 35 is not joined and a pair of thick portions where the resin plate 35 is joined.

幅 The width W1 of the resin plate 35 is preferably 12.5 to 25.0% of the width BW of the belt 26.

厚み The thickness of the belt 26 and the thickness of the resin plate 35 are the same. Therefore, the thickness of the thick portion is set to be about three times the thickness of the thin portion. However, the thickness dimension of the belt 26 and the thickness dimension of the resin plate 35 are not limited to substantially the same, and may be appropriately changed according to the required rigidity. However, the thickness of the thick portion relative to the thickness of the thin portion is preferably 150 to 400%.

は As the resin material constituting the resin plate 35, for example, the same resin material as the resin 32 of the belt 26 can be used. However, the present invention is not limited to this. The resin plate 35 only needs to be able to be welded to the resin 32 of the belt 26. In some cases, a resin material having the same kind of resin material but different in hardness may be used, or a resin material different from the resin 32 may be used. A resin material may be used.

(Tire manufacturing method)
Next, an example of a method for manufacturing the tire 10 will be described.

First, an unvulcanized tire frame member 25 (tire case) including an inner liner 22, a bead core 12, a bead filler 18, a carcass ply 14, and a side rubber layer 24 is formed on the outer periphery of a known tire forming drum (not shown). I do.

Next, the separately formed resin reinforcing member 31 is arranged radially outside the tire frame member 25 on the tire building drum, and the tire frame member 25 is expanded to expand the outer peripheral surface of the tire frame member 25, in other words, the outer periphery of the carcass 16. The surface is pressed against the inner peripheral surface of the resin reinforcing body 31.

Next, an unvulcanized tread 36 is attached to the outer peripheral surface of the belt 26 in the same manner as a general pneumatic tire. Thereby, a raw tire is completed.

Lastly, the green tire is vulcanized and molded in a vulcanization mold in the same manner as a general pneumatic tire. Thereby, the tire 10 is completed.

(Method of Manufacturing Resin Reinforcement 31)
Next, an example of a method for manufacturing the resin reinforcement 31 will be described with reference to FIG.

First, the code supply device 42, the heating device 50, the pressing roller 60, and the cooling roller 70 are movably disposed near the belt forming drum 40.

The cord supply device 42 includes a reel 43 around which the resin-coated cord 34 is wound, and a guide member 44 for guiding the resin-coated cord 34 unwound from the reel 43 to the outer periphery of the belt forming drum 40. Have been. The guide member 44 has a cylindrical shape, and the resin-coated cord 34 passes through the inside thereof. Further, the resin-coated cord 34 is sent out from the mouth 46 of the guide member 44 toward the outer peripheral surface of the belt forming drum 40.

The heating device 50 blows hot air onto the resin-coated cord 34 to heat and melt the blown portion. In the present embodiment, air heated by a heating wire (not shown) is blown out from the outlet 52 by an airflow generated by a fan (not shown), and the blown hot air is blown against the resin-coated cord 34. ing. The configuration of the heating device 50 is not limited to the above configuration, and may be any configuration as long as the thermoplastic resin can be heated and melted. For example, a hot iron may be brought into contact with the side surface of the resin-coated cord 34 to heat and melt the side surface, may be heated and melted by radiant heat, or may be heated and melted by irradiating infrared rays.

The pressing roller 60 is for pressing a resin-coated cord 34 described later against the outer peripheral surface of the belt forming drum 40, and is capable of adjusting the pressing force F. Further, the roller surface of the pressing roller 60 is processed to prevent the resin material in a molten state from adhering. The pressing roller 60 is rotatable. When the resin-coated cord 34 is pressed against the outer periphery of the belt forming drum 40, the pressing roller 60 is driven to rotate in the rotation direction (the direction of the arrow A) of the belt forming drum 40. It has become.

The cooling roller 70 is disposed downstream of the pressing roller 60 in the rotation direction of the belt forming drum 40, and cools the resin coating cord 34 while pressing the resin coating cord 34 against the outer peripheral surface of the belt forming drum 40. is there. Like the pressing roller 60, the cooling roller 70 is capable of adjusting the pressing force, and has been subjected to processing for preventing adhesion of a molten resin material to the roller surface. Further, the cooling roller 70 is rotatable similarly to the pressing roller 60, and when the resin-coated cord 34 is pressed against the outer peripheral surface of the belt forming drum 40, the rotation direction of the belt forming drum 40 (arrow A) Direction). The cooling roller 70 is configured such that a liquid (for example, water) flows through the inside of the roller, and a member (the resin-coated cord 34 in the present embodiment) that comes into contact with the roller surface by heat exchange of the liquid. Can be cooled. When the resin material in the molten state is naturally cooled, the cooling roller 70 may be omitted.

Next, the belt forming drum 40 is rotated in the direction of arrow A, and the resin-coated cord 34 is sent out from the mouth 46 of the cord supply device 42 toward the outer peripheral surface of the belt forming drum 40.

Then, while the hot air is blown out from the outlet 52 of the heating device 50 toward the resin-coated cord 34 and heated to melt the surface of the resin 32, the resin-coated cord 34 is attached to the belt forming drum 40 while Is pressed against the outer peripheral surface of the belt forming drum 40 by the pressing roller 60. The resin-coated cord 34 is deformed (deformed by crushing) so that the side portion swells in the tire rotation axis direction by the pressing roller 60, and the side surfaces of the resin 32 adjacent in the tire rotation axis direction come into contact with each other. Weld.
Thereafter, the molten portion of the resin 32 contacts the cooling roller 70 and is solidified, and the welding of the adjacent resin-coated cords 34 is completed.

In this manner, the resin-coated cord 34 is spirally wound around the outer peripheral surface of the belt forming drum 40 and pressed against the outer peripheral surface, whereby the belt 26 is formed on the outer peripheral surface of the belt forming drum 40.

As described above, the belt 26 is formed by spirally winding a resin-coated cord 34 in which two reinforcing cords 30 are covered with a coating resin 32.

Next, the four resin plates 35 are joined to the belt 26 by welding. Thereby, the resin reinforcement 31 is formed (see FIG. 2). The joining method by welding is not particularly limited, but for the resin plate 35 on the outer side in the tire radial direction, after the belt 26 is formed on the belt forming drum 40, the resin plate 35 is welded to the belt 26 before being removed from the belt forming drum 40. Is preferred.

(Effect)
Next, the operation and effect of the tire 10 of the present embodiment will be described.

In the tire 10 of the present embodiment, a resin in which a reinforcing cord 30 wound in the tire circumferential direction is embedded between a tire frame member 25 including the carcass 16 and a tread 36 formed of a rubber material. A reinforcing body 31 is provided. Thereby, the crown portion of the tire frame member 25 is reinforced.

Here, in the resin reinforcing body 31, the average thickness of the outer region OR (the region 25% from the outer end in the width direction) is larger than the average thickness of the central region CR (the region other than the outer region OR). It is formed as follows. For this reason, the outer portion of the crown portion in the tire width direction is mainly increased in rigidity, and as a result, the cornering power is improved. Further, compared to a mode in which the overall thickness of the resin reinforcing body 31 in the tire width direction is increased, the rigidity of the central portion in the tire width direction in the crown portion is suppressed, and as a result, the reduction in ride comfort is suppressed. I have.

{Circle around (2)} The resin plate 35 is joined to the belt 26 (spiral belt layer) of the resin reinforcing member 31, so that the thickness of the resin reinforcing member 31 outside in the tire width direction is increased. That is, since the resin reinforcing member 31 can be formed by adding the resin plate 35 made of resin to the belt 26, manufacturing is easy.

Further, in the region W1 of the belt 26 where the resin plate 35 is joined and the thickness dimension is increased, when the entire belt width direction of the belt 26 in the tire width direction is 100%, the area W1 is 12. The region is 5 to 25.0%. As described above, since the region to which the resin plate 35 is joined is set to an appropriate region, the improvement in cornering power and the securing of riding comfort are appropriately balanced.

{Circle around (2)} The resin reinforcement 31 is formed such that the average thickness of the outer region OR is 1.5 times (more preferably, 2 times or more) the average thickness of the central region CR. That is, since the ratio of the average thickness dimension of the outer region OR and the central region CR of the resin reinforcing body 31 is set to a certain value or more, a significant effect can be obtained.

Further, since the tensile elasticity of the resin 32 covering the reinforcing cord 30 is set to 50 MPa or more and the thickness is set to 0.7 mm or more, the in-plane shear rigidity of the belt 26 in the tire width direction is sufficiently ensured. be able to.

Further, since the width BW of the belt 26 is set to 75% or more of the contact width TW of the tread 36, the rigidity near the shoulder 39 can be increased.

(Modification of First Embodiment)
In the above description, the example in which the resin-coated cords 34 adjacent to each other in the belt width direction are joined by welding has been described.

In the above description, the example in which the resin plate 35 is joined to the resin 32 of the belt 26 by welding has been described.

In the above description, an example was described in which the resin-coated cord 34 used in manufacturing the belt 26 was formed by coating two reinforcing cords 30 with the resin 32. However, the resin-coated cord 34 is one reinforcing cord 30. May be coated with the resin 32, or three or more reinforcing cords 30 may be coated with the resin 32.

[Second embodiment]
Next, a second embodiment of the present disclosure will be described.

タイヤ The tire of the second embodiment is different from the first embodiment in the configuration of the resin reinforcing body 31. Since the configuration other than the resin reinforcement 31 is substantially the same, a description will be given with reference to FIG. Hereinafter, a method of manufacturing the resin reinforcement 31 of the second embodiment will be described, and the structure thereof will be described.

First, similarly to the first embodiment, a belt 26T shown in FIG. 4A is formed by spirally winding a resin-coated cord 34 in which two reinforcing cords 30 are covered with a resin 32 for covering. I do. However, the resin-coated cord 34 of the second embodiment is formed to have a larger vertical dimension (a direction that coincides with the tire radial direction when the tire is completed) than the resin-coated cord 34 of the first embodiment, and has a substantially square cross section. It has been.

Next, the outer peripheral surface (outer surface in the tire radial direction) and the inner peripheral surface of the belt 26T are cut to reduce the thickness dimension of the belt 26 at the central portion in the width direction. Thus, the belt 26 shown in FIG. 4B is formed. The belt 26 is formed such that the average thickness of the outer region OR is twice or more the average thickness of the center region CR. In the second embodiment, the belt 26 corresponds to the “resin reinforcement” of the present disclosure. That is, the resin reinforcing body 31 does not include the resin plate 35 but includes only the belt 26 (spiral belt layer, a resin-coated cord 34 spirally wound).

(Effect)
Next, the operation and effect of the present embodiment will be described.

Also in the second embodiment, in the resin reinforcement 31, the average thickness of the outer region OR (the region 25% from the outer end in the width direction) is larger than the average thickness of the central region CR (the region other than the outer region OR). Is also formed to be large. For this reason, the outer portion of the crown portion in the tire width direction is mainly increased in rigidity, and as a result, the cornering power is improved. In addition, compared to a mode in which the entire thickness of the resin reinforcement body 31 in the tire width direction is increased, the rigidity of the central portion in the tire width direction in the crown portion is suppressed, and as a result, the reduction in ride comfort is suppressed. I have.

[Modification of Second Embodiment]
In the above description, an example in which the thickness dimension of the central portion in the width direction is reduced by cutting both the outer surface and the inner surface of the belt 26 has been described. For example, even if only the outer surface is cut without cutting the inner surface. Good. Further, for example, only the inner surface may be cut without cutting the outer surface.

[Third embodiment]
Next, a third embodiment of the present disclosure will be described.

タイヤ The tire of the third embodiment is different from the first and second embodiments in the configuration of the resin reinforcing body 31. Since the configuration other than the resin reinforcement 31 is substantially the same, only the resin reinforcement 31 of the third embodiment will be described with reference to FIG.

では In the third embodiment, the resin reinforcement 31 is formed by integral formation by injection molding. Therefore, the shape and size of the resin reinforcing body 31 can be determined by the shape and size of the mold used for injection molding.

The resin reinforcing body 31 is formed such that the thickness dimension gradually decreases from the outer side in the width direction to the center side in the width direction. Therefore, the resin reinforcement 31 cannot be clearly divided into a portion having a large thickness and a portion having a small thickness. However, by changing the shape of the mold used for injection molding, the resin reinforcing body 31 may be formed so that a thick portion (thick portion) and a small portion (thin portion) can be clearly distinguished. . In this case, when the total width of the resin reinforcement 31 is set to 100%, it is preferable that the thick portion be a region of 12.5 to 25.0% from the widthwise outer end of the resin reinforcement 31.

(Effect)
Also in the third embodiment, in the resin reinforcement 31, the average thickness of the outer region OR (the region 25% from the outer end in the width direction) is larger than the average thickness of the central region CR (the region other than the outer region OR). Is also formed to be large. For this reason, the outer portion of the crown portion in the tire width direction is mainly increased in rigidity, and as a result, cornering power is improved. In addition, compared to a mode in which the overall thickness of the resin reinforcement body 31 in the tire width direction is increased, the rigidity of the central portion in the tire width direction in the crown portion is suppressed, and as a result, the reduction in ride comfort is suppressed. I have.

ため Further, since the resin reinforcement 31 is integrally formed, unlike the resin reinforcement 31 of the first or second embodiment, there is no bonding interface existing between the resin-coated cords 34. Therefore, there is no fear of cracking based on the bonding interface of the resin reinforcement 31.

[Supplemental explanation]
As described above, one embodiment of the present disclosure has been described. However, the present disclosure is not limited to the above, and it goes without saying that various other modifications can be made without departing from the scope of the present invention. It is.

In the above description, an example has been described in which the belt 26 has a shape extending linearly in the tire width direction when viewed in a cross section passing through the tire rotation axis. However, the shape of the belt 26 may be such that the central portion in the tire width direction is convex outward in the tire radial direction when viewed in a cross section passing through the tire rotation axis.

In the above description, the example in which the tire 10 is a general pneumatic tire has been described. However, a run-flat tire in which side portions are reinforced with reinforcing rubber may be used.

The disclosure of Japanese Patent Application No. 2018-115207 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

A tire frame member including a carcass,
A tread made of rubber material,
Provided between the tire frame member and the tread, a resin reinforcement body embedded with a reinforcement cord formed of a resin material and wound in the tire circumferential direction,
With
The resin reinforcing member has an average thickness dimension of an outer region that is a region that is 25% from an outer end portion in the tire width direction when the entirety of the resin reinforcing member in the tire width direction is 100%. Greater than the average thickness dimension,
tire.
The resin reinforcing body,
A spiral belt layer formed by spirally winding a resin-coated cord formed by coating the reinforcing cord with a resin in the tire circumferential direction,
An additional member made of resin added to the spiral belt layer,
By adding the additional member to the spiral belt layer, the thickness of the outer portion of the resin reinforcement in the tire width direction is increased,
The tire according to claim 1.
The region of the spiral belt layer where the additional member is joined is 12.5 to 25 from the outer end of the spiral belt layer in the tire width direction when the entirety of the spiral belt layer in the tire width direction is 100%. 0.0% area,
The tire according to claim 2.
In the resin reinforcement, the average thickness of the outer region is 1.5 times or more the average thickness of the central region.
The tire according to any one of claims 1 to 3.