JP2021098430A - Pneumatic tire - Google Patents

Abstract

To provide a pneumatic tire configured so as to suppress strain that is caused in resin of a belt.SOLUTION: A pneumatic tire 10 comprises: a carcass 16; a spiral belt 26 arranged outside in a tire radial direction of the carcass 16 and configured by coating a belt cord 30 spirally wound around in a tire circumferential direction with a resin material 32; a tread 36 arranged outside in a radial direction of the spiral belt 26; a plurality of circumferential main grooves 40 formed in the tread 36 and formed along the tire circumferential direction; and a shear suppressing reinforcement layer 48 arranged along the spiral belt 26, from at least a belt end 26E of the spiral belt 26 to a circumferential main groove 40B outermost in a tire width direction, which is configured to include the belt cord 30, an organic fiber cord extending obliquely with respect to the tire circumferential direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pneumatic tire having a belt with a resin layer.

As a pneumatic tire to be mounted on an automobile, there is a pneumatic tire provided with a belt formed of a resin layer on the outer side of the carcass in the radial direction (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-069745

The vicinity of the tire equatorial plane, in other words, the vicinity of the center in the tire direction, is relatively flat, and both ends in the tire width direction, in other words, the vicinity of the shoulder is curved with a relatively small radius of curvature so as to approach the tire rotation axis toward the outside in the tire width direction. In the vicinity of the end of the belt, the belt has a double curvature including a curvature of curvature in the tire circumferential direction and a curvature of curvature in the tire width direction.

When the pneumatic tire is used for running and the tread touches the ground, the belt on the ground side is deformed linearly in the circumferential direction when viewed from the tire side.
Further, when viewed from the front of the tire, the curved portions on both sides in the width direction of the belt on the ground contact side are deformed in the direction in which the curvature is increased, in other words, the belt is deformed substantially linearly.
Therefore, when the pneumatic tire is used for traveling, the vicinity of the end portion in the width direction of the belt is distorted due to the deformation in the circumferential direction and the deformation in the width direction.

The pneumatic tire of Patent Document 1 has a so-called interlaced layer having a two-layer structure in which reinforcing cords made of organic fiber cords such as steel cords and aramid cords that are inclined and extend in the tire circumferential direction are arranged in the tire circumferential direction. The belt is described, and it is described that a reinforcing layer in which a reinforcing cord is embedded in a resin layer is used for the belt.

In recent years, there is a spiral belt in which a reinforcing cord spirally wound in the tire circumferential direction is embedded in a rubber layer.
In this spiral belt, it is conceivable that the reinforcing cord is embedded in the resin layer. However, in the spiral belt, since the reinforcing cord extends in the tire circumferential direction, the above distortion occurs in the resin between the reinforcing cord and the reinforcing cord. May act repeatedly over a long period of time.

In consideration of the above facts, an object of the present invention is to provide a pneumatic tire capable of suppressing distortion generated in the resin of the belt.

The pneumatic tire according to claim 1 has a carcass straddling from one bead portion to the other bead portion and a belt cord arranged outside the carcass in the tire radial direction and spirally wound in the tire circumferential direction. A spiral belt covered with a resin material, a tread arranged on the radial outer side of the spiral belt, and a plurality of circumferential main grooves formed on the tread and formed along the tire circumferential direction. A tread that is arranged along the spiral belt from at least the belt end of the spiral belt to the outermost peripheral main groove in the tire width direction and includes an organic fiber cord extending inclined with respect to the tire circumferential direction. It has a restraining reinforcing layer.

In the pneumatic tire according to claim 1, a shear suppression reinforcing layer composed of an organic fiber cord is arranged along the spiral belt from at least the belt end of the spiral belt to the outermost circumferential main groove in the tire width direction. Therefore, the shear strain generated at least from the belt end of the spiral belt to the outermost peripheral main groove in the tire width direction can be suppressed by the shear suppression reinforcing layer.

The shear-suppressing reinforcing layer according to claim 1 extends in the tire circumferential direction because the organic fiber cord extends in an inclined manner with respect to the tire circumferential direction, in other words, the organic fiber cord extends in an interlaced manner with respect to the belt cord. The effect of suppressing the shear distortion in the tire circumferential direction generated in the spiral belt can be enhanced as compared with the case where the spiral belt extends in the direction parallel to the tire or in the direction perpendicular to the tire circumferential direction.

The invention according to claim 2 is the first aspect of the pneumatic tire according to claim 1, wherein the shear suppression reinforcing layer includes a plurality of the organic fiber cords inclined upward to the right with respect to the tire circumferential direction. The layer and the second layer including the plurality of organic fiber cords inclined to the left with respect to the tire circumferential direction are laminated.

The first layer containing a plurality of organic fiber cords inclined upward to the right with respect to the tire circumferential direction and the second layer containing a plurality of organic fiber cords inclined upward to the left with respect to the tire circumferential direction Since the laminated shear-suppressing reinforcing layer is an interlaced layer in which expansion and contraction in the tire circumferential direction is suppressed, the tension in the tire circumferential direction and the tension in the tire circumferential direction are compared with the case where all the organic fiber cords are inclined in the same direction. The deformation suppressing effect is high for both compressions.
Organic fiber cords tend to have weaker compressive strength than tensile strength. For example, kink is likely to occur. Therefore, by interlacing the organic fiber cords with each other in the shear suppression reinforcing layer, the organic fiber cords become stronger against compression. Become

According to the third aspect of the present invention, in the pneumatic tire according to the first or second aspect, the shear suppressing reinforcing layer is arranged on the carcass side of the spiral belt.

When a pneumatic tire is used for running and the spiral belt is deformed due to contact with the road surface, at the stepping part of the tire, due to the diameter difference between the inner peripheral part of the spiral belt and the outer peripheral part, the inner peripheral part of the spiral belt is formed. Tensile force acts.

By arranging the shear suppression reinforcing layer on the carcass side of the spiral belt, in other words, on the inner peripheral side of the spiral belt, the inner peripheral portion of the spiral belt can be suppressed from extending in the tire circumferential direction. Therefore, the shear strain in the tire circumferential direction can be suppressed.

As described above, the pneumatic tire of the present invention has an excellent effect that the strain generated in the resin of the belt can be suppressed.

It is sectional drawing along the tire rotation axis which shows the pneumatic tire which concerns on one Embodiment of this invention. (A) is a cross-sectional view showing a shear-suppressing reinforcing layer, and (B) is a plan view schematically showing a shear-suppressing reinforcing layer. It is explanatory drawing explaining the distortion which occurs in the spiral belt of the ground contact part of a tread. It is sectional drawing along the tire rotation axis which shows the pneumatic tire which concerns on another embodiment.

The pneumatic tire 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 shows the shape of the pneumatic tire 10 attached to the standard rim 19 in a natural state before being filled with air (internal pressure = atmospheric pressure).
As shown in FIG. 1, the pneumatic tire 10 of the present embodiment is, for example, a so-called radial pneumatic tire used in a passenger car, includes a pair of bead portions 20 in which a bead core 12 is embedded, and one bead portion 20. A carcass 16 composed of one carcass ply 14 straddles between the bead portion 20 and the other bead portion 20.

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 coated rubber (not shown). That is, the pneumatic tire 10 of the present embodiment is a so-called radial pneumatic tire. The material of the cord of the carcass ply 14 is, for example, PET, but other conventionally known materials may be used.

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

The cross-sectional shape of the main body 14A of the carcass ply 14 in the pneumatic tire 10 of the present embodiment is the same cross-sectional shape as that of a conventional general pneumatic tire, and the radius around the tire equatorial plane CL is substantially constant and flat. Yes, the radius is gradually decreasing near the shoulder.

A bead filler 18 whose thickness gradually decreases from the bead core 12 toward the outside in the tire radial direction is arranged between the main body portion 14A and the folded-back portion 14B of the carcass ply 14. In the pneumatic tire 10 of the present embodiment, the bead portion 20 is a portion of the bead filler 18 inside the tire radial direction from the outer end 18A in the tire radial direction.

An inner liner 22 made of rubber is arranged inside the pneumatic tire of the carcass 16. On the other hand, on the outer side of the carcass 16 in the tire width direction, the bead portion 20 and the side rubber layer 24A forming the outer surface of the side portion 24 are arranged.

In the present embodiment, the tire case 25 is composed of the bead core 12, the carcass 16, the bead filler 18, the inner liner 22, and the side rubber layer 24A. In other words, the tire case 25 is a pneumatic tire skeleton member forming the skeleton of the pneumatic tire 10.

(Spiral belt)
A spiral belt 26 for restraining the outer peripheral portion of the carcass 16 and obtaining a tag effect is arranged on the outside of the crown portion of the carcass 16, in other words, the outside of the carcass 16 in the tire radial direction. The spiral belt 26 of the present embodiment is formed almost entirely flat when viewed in a cross section along the rotation axis, in other words, the central portion in the tire width direction is formed in a straight line parallel to the tire rotation axis. However, both ends in the tire width direction have a smaller radius of curvature than the central part in the tire width direction, and are curved inward in the tire radial direction.

The spiral belt 26 of the present embodiment is formed by spirally winding a resin-coated cord 34 in which a plurality of (two in the present embodiment) belt cords 30 are coated with a resin material 32. Therefore, the belt cord 30 is substantially parallel to the tire circumferential direction (strictly speaking, the belt cord 30 is inclined by several degrees in the tire circumferential direction). Further, when the spiral belt 26 is viewed in a plan view, the belt cords 30 are arranged in parallel with each other.

It is preferable to use a belt cord 30 that is thicker than the cord of the carcass ply 14 and has a large strength (tensile strength). The belt cord 30 of the spiral belt 26 can be composed of a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (twisted wire) obtained by twisting these fibers. The belt cord 30 of this embodiment is a steel cord. As the belt 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.

For the resin material 32 that covers the belt cord 30, a rubber material that constitutes the side rubber layer 24A and a resin material that has a higher tensile elastic modulus than the rubber material that constitutes the tread rubber layer 36A that constitutes the tread 36 described later is used. Can be done. As the resin material 32 for coating the belt cord 30, an elastic thermoplastic resin, 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). , Dynamic cross-linked thermoplastic elastomer (TPV) and the like.

Examples of the thermoplastic resin include polyurethane resin, polyolefin resin, vinyl chloride resin, and polyamide resin. Further, as the thermoplastic resin material, for example, the deflection temperature under load (at 0.45 MPa load) specified in ISO75-2 or ASTM D648 is 78 ° C. or higher, and the tensile yield strength specified in JIS K7113 is 10 MPa. As described above, those having a tensile fracture elongation of 50% or more specified in JIS K7113 and a Bikat softening temperature (method A) specified in JIS K7206 of 130 ° C. or more can be used.

The tensile elastic modulus (specified in JIS K7113: 1995) of the resin material 32 covering the belt cord 30 is preferably 100 MPa or more. Further, the upper limit of the tensile elastic modulus of the resin material 32 covering the belt cord 30 is preferably 1000 MPa or less. The tensile elastic modulus of the resin material 32 that covers the belt cord 30 is particularly preferably in the range of 200 to 700 MPa.

The thickness of the spiral belt 26 of the present embodiment is preferably larger than the diameter dimension of the belt cord 30, in other words, the belt cord 30 is preferably completely embedded in the resin material 32. When the pneumatic tire 10 is for a passenger car, the thickness of the spiral belt 26 is preferably 0.70 mm or more.

(tread)
A tread rubber layer 36A made of an elastic material such as rubber constituting the tread 36 is arranged on the outer side of the spiral belt 26 in the tire radial direction. The tread rubber layer 36A extends beyond the ground contact end 36E of the tread 36 toward the side portion 24, and also forms an outer surface of the shoulder portion (also referred to as a buttress portion) 38.

The ground contact end 36E means an end portion of the ground contact width TW described below. The ground contact width TW of the tread 36 means that the pneumatic tire 10 is attached to the standard rim specified in the JATMA YEAR BOOK (2019 edition, Japan Automobile Pneumatic Tire Association standard), and the applicable size ply in the JATMA YEAR BOOK. Fill the internal pressure with 100% of the air pressure (maximum air pressure) corresponding to the maximum load capacity (internal pressure-load capacity correspondence table in bold) in the rating so that the rotation axis is parallel to the horizontal flat plate in a stationary state. It is the one when the mass corresponding to the maximum load capacity is added. If the TRA standard or ETRTO standard is applied at the place of use or manufacturing, the respective standards will be followed.

As an example, the shoulder portion 38 of the present embodiment refers to a region between the ground contact end 36E and the 77% position of the cross-sectional height SH of the pneumatic tire 10.

As the rubber material used for the tread rubber layer 36A, conventionally known ones are used. The tread 36 is formed with circumferential main grooves 40A and 40B extending along the tire circumferential direction. As the pattern of the tread 36, a conventionally known pattern can be used, and a lateral groove (not shown) or the like may be formed.

The width BW of the spiral belt 26 measured along the tire axial direction is preferably 75% or more of the ground contact width TW of the tread 36 measured along the tire axial direction. The upper limit of the width BW of the spiral belt 26 is preferably 110% with respect to the ground contact width TW.

The tread 36 is formed with circumferential main grooves 40A and 40B extending in the circumferential direction inside the ground contact end 36E in the tire width direction.

The belt end 26E of the spiral belt 26 may be covered with a layer containing an organic fiber cord or the like, if necessary.

(Shear suppression reinforcement layer)
On the carcass 16 side of the spiral belt 26, in the present embodiment, a shear suppression reinforcing layer 48 is provided between the spiral belt 26 and the carcass 16. The shear suppression reinforcing layer 48 is a reinforcing layer that suppresses shear distortion in the tire circumferential direction of the spiral belt 26, and can be rephrased as a belt reinforcing layer. Further, the shear suppressing reinforcing layer 48 can increase the in-plane rigidity of the spiral belt 26.
The shear suppression reinforcing layer 48 is arranged in a region extending from at least the belt end 26E of the spiral belt 26 to the outermost circumferential main groove 40B (groove end portion on the shoulder side) in the tire width direction. In other words, the shear suppression reinforcing layer 48 is arranged on the shoulder side of the spiral belt 26 at a portion having a small radius of curvature of curvature and having a double curvature.
The shear suppression reinforcing layer 48 may be provided beyond the circumferential main groove 40B toward the tire equatorial plane CL side, or may be arranged up to the other belt end 26E (not shown in FIG. 1). ..

As shown in FIGS. 2 (A) and 2 (B), the shear suppression reinforcing layer 48 is formed by coating a plurality of cords 48B extending so as to increase to the left with respect to the tire circumferential direction with an elastic material 48A. It is a so-called interlaced layer in which the layer 50 of No. 1 and the second layer 52 formed by coating a plurality of cords 48B extending upwardly inclined with respect to the tire circumferential direction with an elastic material 48A are laminated. Either the first layer 50 or the second layer 52 may be within the tire radial direction.

The inclination angle θ1 of the code 48B of the first layer 50 with respect to the tire circumferential direction and the inclination angle θ2 of the code 48B of the second layer 52 with respect to the tire circumferential direction are preferably set within the range of 30 to 60 °.

When a resin is used for the elastic material 48A used for the shear suppression reinforcing layer 48, the same type of resin as the resin material 32 coated with the belt cord 30 can be used, and a resin different from the resin material 32 should be used. You can also. As an example, as the resin used for the elastic material 48A, a resin having a higher tensile elastic modulus than the resin material 32 coated with the belt cord 30 can be used. When rubber is used as the elastic material 34A, a rubber having a higher tensile elastic modulus than the resin material 32 coated with the belt cord 30 can be used as the rubber. When a resin is used for the elastic material 48A, it can be fused with the resin material 32 coated with the belt cord 30.

An organic fiber cord is used for the cord 48B used for the shear suppression reinforcing layer 48. As an example of the material of the organic fiber cord, known organic materials used for tires such as PET (polyethylene terephthalate), aromatic polyamide, aliphatic polyamide, rayon and the like can be mentioned.

The shear suppression reinforcing layer 48 can be adhered to the spiral belt 26 and the carcass ply 14 by using an adhesive. Further, when the elastic material 48A of the shear suppression reinforcing layer 48 is a thermoplastic resin, it can be welded to the resin material 32 of the spiral belt 26.

(Action, effect)
Next, the action and effect of the pneumatic tire 10 of the present embodiment will be described.
FIG. 3 is an explanatory diagram for explaining the distortion generated by the spiral belt 26 of the ground contact portion (the portion in contact with the road surface G shown in FIG. 1) 36C of the tread 36. In FIG. 3, the ground contact portion 36C is viewed in a plan view from the outside of the tire (road surface side), the tire rotation direction is the direction indicated by the arrow R, and the traveling direction of the vehicle is the direction indicated by the arrow F.

The spiral belt 26 of the present embodiment is curved in the tire circumferential direction in the vicinity of the shoulder portion 38, in other words, in the vicinity of the belt end 26E, and is also curved in the tire width direction intersecting the tire circumferential direction, and is double. It has a curvature.

When the pneumatic tire 10 is used for traveling, the curved portion of the spiral belt 26 is linearly deformed by the ground contact, and the spiral belt 26 is deformed from the linear shape to the curved shape to become the spiral belt 26 of the ground contact portion. As shown in FIG. 3, a portion T on which a tensile force in the tire circumferential direction acts and a portion C on which a compressive force in the tire circumferential direction acts are generated on the stepping side and the kicking side near the belt end.
When such a tensile force and a compressive force in the tire circumferential direction act on the spiral belt 26, shear strain in the tire circumferential direction occurs in the belt.

The range from the belt end 26E to the outermost circumferential main groove 40B in the tire width direction is the portion where the spiral belt 26 has a double curvature, and during running, the spiral belt 26 has shear distortion in the tire circumferential direction. Is a part that is particularly likely to occur.

In the pneumatic tire 10 of the present embodiment, since the shear suppression reinforcing layer 48 is arranged in the portion of the spiral belt 26 where the shear strain is likely to occur, the shear strain generated in the spiral belt 26 can be effectively suppressed.

In the pneumatic tire 10 of the present embodiment, since the shear suppression reinforcing layer 48 arranged inside the spiral belt 26 in the tire radial direction is an interlaced layer in which the cords 48B are interlaced, it is compared with the case where the cords 48B are not interlaced. Therefore, the deformation suppressing effect can be enhanced with respect to tension and compression, and the deformation of the spiral belt 26 can be effectively suppressed. That is, the shear suppression reinforcing layer 48 formed as an interlaced layer has a suitable configuration for suppressing the shear strain of the spiral belt 26.

Therefore, in the resin material 32 of the spiral belt 26 arranged from the belt end 26E to the outermost circumferential main groove 40B in the tire width direction, cracks extending along the tire circumferential direction due to shear strain in the tire circumferential direction occur. Can be effectively suppressed.

Since there is a diameter difference between the inner peripheral surface and the outer peripheral surface of the spiral belt 26, the pneumatic tire 10 is used for running, and the spiral belt 26 is curved to linear on the stepping side due to contact with the road surface. When deformed to, a tensile force acts on the inner portion of the spiral belt 26 in the radial direction of the tire.

In the pneumatic tire 10 of the present embodiment, since the shear suppression reinforcing layer 48 arranged inside the spiral belt 26 in the tire radial direction is an interlaced layer that is strong against both tension and compression, the tension acting on the spiral belt 26 is applied. It can receive the force and effectively suppress the deformation of the spiral belt 26.

By making the shear suppression reinforcing layer 48 a composite material composed of the elastic material 48A and the cord 48B, the spiral belt is compared with the case where the composite material is not used, in other words, the case where the resin alone or the rubber alone is used. The effect of suppressing the shear strain of 26 can be enhanced.

In the pneumatic tire 10 of the present embodiment, the cord 48B extends in an inclined manner with respect to the tire circumferential direction, in other words, the cord 48B extends in an interlaced manner with respect to the belt cord 30. The effect of suppressing the shear distortion in the tire circumferential direction generated in the spiral belt 26 can be enhanced as compared with the case where the spiral belt 26 extends in the parallel direction or in the direction perpendicular to the tire circumferential direction, in other words, in the tire width direction. The inclination angles θ1 and θ2 of the code 48B with respect to the tire circumferential direction are appropriately selected so as to suppress the shear distortion of the spiral belt 26 in the tire circumferential direction.

The cord 48B may be inclined with respect to the tire circumferential direction as needed, and may not be inclined with respect to the tire circumferential direction as long as the shear distortion in the tire circumferential direction can be suppressed, in other words, the cord. 48B may be parallel to the tire circumferential direction or may be parallel to the tire width direction. Further, the cord 48B may be provided as needed, and the shear suppressing reinforcing layer 48 may be composed of only the elastic material 48A as long as the shear strain in the tire circumferential direction can be suppressed.

[Other Embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be variously modified and implemented within a range not deviating from the gist thereof. Is.

The shear suppression reinforcing layer 48 may be provided from the belt end 26E to the tire equatorial plane CL side beyond the circumferential main groove 40BA on the shoulder side, and is provided from one belt end 26E to the other belt end 26E (in FIG. 1). It may be arranged up to (not shown). As a result, the shear distortion of the spiral belt 26 can be suppressed even inside the tire width direction (tire equatorial plane CL side) with respect to the circumferential main groove 40B on the shoulder side.

Further, in the above embodiment, the shear suppressing reinforcing layer 48 is provided only on the carcass 16 side of the spiral belt 26, but as shown in FIG. 4, the shear suppressing reinforcing layer 48 is provided on the carcass 16 side of the spiral belt 26 and the tread. It may be provided on both sides, and although not shown, the shear suppression reinforcing layer 48 may be provided only on the tread side of the spiral belt 26.

The shear suppression reinforcing layer 48 of the above embodiment includes a first layer 50 formed by coating a plurality of cords 48B extending in an upwardly inclined direction with respect to the tire circumferential direction with an elastic material 48A, and the tire circumferential direction. On the other hand, the configuration was such that a second layer 52 formed by coating a plurality of cords 48B extending upward to the left with an elastic material 48A was laminated, but the cords 48B inclined upward to the right with respect to the tire circumferential direction. A plurality of cords 48B extending in the direction of the tire and a plurality of cords 48B extending in an upwardly inclined direction with respect to the tire circumferential direction may be overlapped and coated with the elastic material 48A, or may be coated with the elastic material 48A. The configuration may not be (that is, code 48B only).

In the above embodiment, an example in which the present invention is applied to a tire for a passenger car has been described, but the present invention can also be applied to tires of other types other than a passenger car, such as a tire for a bus, a tire for a truck, and a tire for a heavy load.

10 ... Pneumatic tire, 16 ... Carcass, 26 ... Spiral belt, 26A ... Belt end, 30 ... Belt cord, 32 ... Resin material, 36 ... Tread, 40B ... Outermost circumferential main groove in tire width direction, 48 ... Shearing Suppressive reinforcement layer, 48A ... elastic material, 48B ... cord, 50 ... first layer, 52 ... second layer

Claims (3)

A carcass that straddles one bead part to the other bead part,
A spiral belt arranged on the outer side of the carcass in the tire radial direction and having a belt cord spirally wound in the tire circumferential direction coated with a resin material.
A tread arranged on the radial outer side of the spiral belt and
A plurality of circumferential main grooves formed on the tread and formed along the tire circumferential direction,
A shearing that is arranged along the spiral belt from at least the belt end of the spiral belt to the outermost peripheral main groove in the tire width direction and includes an organic fiber cord extending in an inclined direction with respect to the tire circumferential direction. With a restraining reinforcement layer,
Pneumatic tires with. The shear suppression reinforcing layer includes a first layer containing a plurality of the organic fiber cords inclined upward to the right with respect to the tire circumferential direction, and a plurality of the organic fibers inclined upward to the left with respect to the tire circumferential direction. The pneumatic tire according to claim 1, wherein a second layer including a cord is laminated. The pneumatic tire according to claim 1 or 2, wherein the shear suppressing reinforcing layer is arranged on the carcass side of the spiral belt.

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