JP2019156290A - Pneumatic tire - Google Patents

Abstract

To provide a pneumatic tire that can suppress deterioration in readability of a two-dimensional code impressed on thereon even if the pneumatic tire is used for a long period of time.SOLUTION: The pneumatic tire comprises: a sheet-like reinforcing member arranged to be laminated with outside in a tire width direction with respect to a carcass play; and a rubber member provided to contact the outside in the tire width direction with respect to the carcass play and the reinforcing member. On the surface of the rubber member is provided a two-dimensional code in which dot patterns are formed of two kinds of gradation elements formed to be identical to each other by irregularity on the surface. An arrangement range in a tire radial direction in which the two-dimensional code is provided overlaps with an arrangement range in the tire radial direction of the reinforcing member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire including a two-dimensional code stamped on a sidewall portion of the tire.

  In recent years, it has been proposed to provide a two-dimensional code in which information is recorded on a sidewall portion of a pneumatic tire (hereinafter simply referred to as a tire). Since the two-dimensional code can include more information than the one-dimensional code, various information can be included in the two-dimensional code to manage the tire. In particular, it has been proposed to provide a two-dimensional code composed of a pattern of light and shade elements on a tire side surface by marking a tire side surface (sidewall) with a predetermined dot hole pattern (Patent Literature). 1).

  Since the two-dimensional code formed by imprinting a predetermined dot hole pattern on the tire side surface portion does not disappear unless the tire side surface portion is worn, the tire can be managed effectively.

International Publication No. 2005/000714

A pneumatic tire with a plurality of dot holes stamped with such a two-dimensional code can read the two-dimensional code when it is new, but it rolls under a load in an outdoor environment. In some cases, the readability of the two-dimensional code may deteriorate. The reading of the two-dimensional code is reading of the two-dimensional code by a two-dimensional code reader, for example, a portable terminal, and the deterioration of the readability means that reading often increases. The two-dimensional code provided in the pneumatic tire is used by reading information recorded on the two-dimensional code during use of the tire. For this reason, when the tire is used for a long time, the surface of the two-dimensional code is uneven due to the occurrence and development of cracks in the dot holes of the two-dimensional code, making it difficult to distinguish between the light and dark elements and reducing the readability of the two-dimensional code It is not preferable to do. For this reason, it is preferable that a decrease in the readability of the two-dimensional code is suppressed during long-term use of the tire.
In addition, since the dot hole has a shape that is recessed substantially perpendicularly from the surface of the sidewall portion, cracks occur in the dot hole as the tire is used, and in the depth direction of the side rubber, further on the surface of the sidewall portion. Propagation of cracks along the side is not preferable from the viewpoint of durability of the side rubber and, in turn, durability of the pneumatic tire.

  Therefore, an object of the present invention is to provide a pneumatic tire on which a two-dimensional code is engraved, which can suppress a decrease in readability of the two-dimensional code even when the pneumatic tire is used for a long period of time.

One aspect of the present invention is a pneumatic tire,
A pair of annular bead cores;
At least one carcass ply provided to form a toroidal shape between the pair of bead cores;
A sheet-like reinforcing member arranged to be laminated on the outer side in the tire width direction with respect to the carcass ply;
A rubber member provided in contact with the carcass ply and the reinforcing member on the outer side in the tire width direction,
On the surface of the rubber member, there is provided a two-dimensional code in which a dot pattern is formed with two kinds of light and shade elements formed so as to be distinguishable from each other by surface irregularities,
The arrangement range of the tire radial direction in which the two-dimensional code is provided overlaps with the arrangement range of the reinforcing member in the tire radial direction.

The arrangement range of the two-dimensional code is within the arrangement range of the reinforcing member,
A distance A along the tire radial direction between the end of the reinforcing member in the tire radial direction and the end of the two-dimensional code in the tire radial direction; and the end of the reinforcing member in the tire radial direction; At least one of the distances B along the tire radial direction with respect to the inner end of the dimension code in the tire radial direction is 0.5 to 2.5% of the length in the tire radial direction of the arrangement range of the reinforcing member. Preferably there is.

  In the arrangement range of the reinforcing member that overlaps the arrangement range of the two-dimensional code, the thickness of the reinforcing member is preferably 1 mm or more.

  The thickness of the rubber member positioned in the arrangement range of the two-dimensional code is preferably 2.5 mm or more.

The reinforcing member is a first rubber member different from the rubber member,
Regarding the rubber hardness according to JIS K6253-3, it is preferable that the first rubber member is harder than the rubber member of the sidewall portion of the pneumatic tire.

A bead filler rubber member positioned outside the bead core in the tire radial direction and disposed so as to be surrounded by the carcass ply;
Regarding the rubber hardness according to JIS K6253-3, it is preferable that the first rubber member is softer than the bead filler rubber member.

The surface of the sidewall portion of the pneumatic tire has a smooth region not having a ridge,
The region of the sidewall portion provided with the two-dimensional code is preferably surrounded by the smooth region.

  When the cross-sectional height along the tire radial direction from the innermost position in the tire radial direction of the bead core to the maximum tire outer diameter position is SH, the two-dimensional code starts from the innermost position in the tire radial direction of the bead core. The distance H along the tire radial direction to the center position in the tire radial direction is preferably 70% or less of the cross-sectional height SH.

  It is preferable that the two-dimensional code is provided on each of the sidewall portions on both sides in the tire width direction of the pneumatic tire.

  ADVANTAGE OF THE INVENTION According to this invention, even if it uses a pneumatic tire for a long term, the fall of the readability of a two-dimensional code can be suppressed.

It is a figure which shows an example of a structure of the pneumatic tire of one Embodiment. (A), (b) is a figure explaining the example of the two-dimensional code of one Embodiment.

Hereinafter, the pneumatic tire of this embodiment will be described in detail.
In the present specification, the tire width direction is a direction parallel to the rotation axis of the pneumatic tire. The outer side in the tire width direction is the side away from the tire equator line CL (see FIG. 1) representing the tire equator plane in the tire width direction. The inner side in the tire width direction is the side closer to the tire equator line CL in the tire width direction. The tire circumferential direction is a direction that rotates around the rotation axis of the pneumatic tire as the center of rotation. The tire radial direction is a direction orthogonal to the rotation axis of the pneumatic tire. The outer side in the tire radial direction refers to the side away from the rotation axis. The inner side in the tire radial direction refers to the side approaching the rotation axis.

  The distances A and B, the arrangement ranges R1 and R2, the cross-sectional height SH, and the distance H, which will be described later in this specification, are dimensions measured in a no-load state in which a tire is assembled on a specified rim and a specified internal pressure is applied. Here, the specified rim refers to “applied rim” defined in JATMA, “Design Rim” defined in TRA, or “Measuring Rim” defined in ETRTO. The specified internal pressure refers to the “maximum air pressure” specified by JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” specified by TRA, or “INFLATION PRESSURES” specified by ETRTO.

  In the embodiment described below, a two-dimensional code is stamped on the sidewall portion. The engraving referred to in the present embodiment refers to a mode in which laser light is focused on the surface of the side wall portion to concentrate energy, and the side rubber member is locally heated and incinerated to form a plurality of minute dot holes on the surface. It includes forming a two-dimensional code by imprinting irregularities on the member by another means.

  The two-dimensional code referred to in the present embodiment is a one-dimensional code having information only in the horizontal direction (a matrix display system code having information in two directions with respect to a bar code. As the two-dimensional code, for example, a QR code is used. (Registered trademark), data matrix (registered trademark), Maxicode, PDF-417 (registered trademark), 16K code (registered trademark), 49 code (registered trademark), Aztec code (registered trademark), SP code (registered trademark), Includes Vericode (registered trademark) and CP code (registered trademark).

(Pneumatic tire)
FIG. 1 is a diagram illustrating an example of a configuration of a pneumatic tire 10 (hereinafter simply referred to as a tire 10) of the present embodiment. FIG. 1 shows a profile cross section on one side in the tire width direction with respect to the tire equator line CL.

  The tire 10 includes a tread portion 10T having a tread pattern, a pair of bead portions 10B on both sides in the tire width direction, and a pair of side portions provided on both sides of the tread portion 10T and connected to the pair of bead portions 10B and the tread portion 10T. Wall part 10S. The tread portion 10T is a portion in contact with the road surface. The sidewall portion 10S is a portion provided so as to sandwich the tread portion 10T from both sides in the tire width direction. The bead portion 10B is a portion that is connected to the sidewall portion 10S and is located on the inner side in the tire radial direction with respect to the sidewall portion 10S.

  The tire 10 includes a carcass ply 12, a belt 14, and a bead core 16 as a skeleton material, and further includes a reinforcing member 28. The tread rubber member 18, the side rubber member 20, the rim cushion rubber member 24, and the inner liner rubber member 26 are mainly provided around the skeleton material and the reinforcing member 28. The tire 10 further includes a bead filler rubber member 22.

  The carcass ply 12 is formed of a carcass ply material that is wound around a pair of annular bead cores 16 to form a toroidal shape between the pair of bead cores 16 and organic fibers are covered with rubber. The carcass ply 12 is wound around the bead core 16 and extends outward in the tire radial direction. On the tire equator line CL on the outer side in the tire radial direction of the carcass ply 12, a laminated belt 14 composed of two belt members 14a and 14b is provided. The belt 14 is configured by a member in which a rubber is coated on a steel cord disposed at a predetermined angle, for example, 20 to 30 degrees with respect to the tire circumferential direction, and the lower belt material 14a is replaced with the upper belt material 14b. The width in the tire width direction is longer than that. The inclination directions of the steel cords of the two-layer belt materials 14a and 14b are opposite to each other. For this reason, belt material 14a, 14b serves as a crossing layer, and controls expansion of carcass ply 12 by the filled air pressure.

A tread rubber member 18 is provided on the outer side in the tire radial direction of the belt 14, and side rubber members 20 are connected to both ends of the tread rubber member 18 to form a sidewall portion 10 </ b> S together with the reinforcing member 28. A rim cushion rubber member 24 is provided at the inner end in the tire radial direction of the side rubber member 20 and is in contact with a rim on which the tire 10 is mounted. The bead core 16 has a bead that is sandwiched between a portion of the carcass ply 12 before being wound around the bead core 16 and a portion of the carcass ply 12 after being wound around the bead core 16 on the outer side in the tire radial direction of the bead core 16. A filler rubber member 22 is provided. A sheet-like reinforcing member 28 is disposed on the outer side in the tire width direction of the portion of the carcass ply 12 after being wound around the bead core 16 so as to be laminated on the carcass ply 12. An inner liner rubber member 26 is provided on the inner surface of the tire 10 facing the tire cavity region filled with air surrounded by the tire 10 and the rim.
In addition, a two-layer belt cover 30 that covers the belt 14 from the outer side in the tire radial direction of the belt 14 and is coated with rubber is provided between the belt member 14b and the tread rubber member 18. The belt cover 30 may be provided as necessary and is not essential. The number of layers of the belt cover 30 is not limited to two, and may be one or three.
A two-dimensional code 40 (indicated by a thick line in FIG. 1) is provided on the surface of the sidewall portion 10S of the tire 10 as described above.

(Two-dimensional code)
2A and 2B are diagrams illustrating an example of the two-dimensional code 40 according to the embodiment.
As shown in FIG. 1, the two-dimensional code 40 is stamped on the surface of the side rubber member 20 of the sidewall portion 10S. According to one embodiment, the two-dimensional code 40 is formed on the surface of the side rubber member 20 on both side wall portions 10S on both sides in the tire width direction. According to another embodiment, it is formed on the surface of the side rubber member 20 of any one of the sidewall portions 10S.
The two-dimensional code 40 is obtained by forming a dot pattern with two kinds of light and dark elements formed so as to be distinguishable from each other by surface irregularities. The two-dimensional code 40 of the present embodiment concentrates the laser beam on the surface of the sidewall portion 10S to concentrate the energy and locally heats and burns the side rubber member 20 to form minute dot holes 40a (FIG. 2B). ) See)). The dot hole 40a is, for example, a conical hole, the diameter on the tread surface is, for example, 0.1 to 1.0 mm, the depth is, for example, 0.3 to 1.0 mm, and further 0.5 to 0. .8 mm.
As shown in FIG. 2A, the two-dimensional code 40 has a structure in which one dot hole 40a (concave portion) is provided in the unit cell region of the dark region among the unit cells that divide the light and dark elements of the two-dimensional code 40. Has been. That is, the two-dimensional code 40 corresponds to a plurality of rectangular unit cell areas of the same size divided in a lattice shape so that one dot hole 40a forms one unit cell area having a dark gray element. The dot hole 40a is arranged. In FIG. 2A, the dark area of the unit cell area is indicated by a black area.

A two-dimensional code 40 shown in FIG. 2A is a QR code (registered trademark), and includes a dot pattern region 42 in which a dot pattern is formed with two types of light and dark elements. Around the dot pattern area 42, a blank area 44 surrounded by the same light element as the light element among the light and dark elements is provided. The blank area 44 is an area defined as a quiet zone in the QR code (registered trademark), and is an area necessary for reading the QR code (registered trademark). The thickness of the blank area 44 surrounding the dot pattern area 42 is preferably 4 to 5 times the size of the unit cell area in the dot pattern area 42, for example. For example, the thickness w of the blank area 44 is preferably 4% to 25% of the maximum dimension among the two dimensions in the rectangular shape of the dot pattern area 42.
Since the two-dimensional code 40 shown in FIG. 2A is a QR code (registered trademark), the dot pattern region 42 displays a data cell region 42a displaying a QR code (registered trademark) data cell and a cut-out symbol. The cut-out symbol area 42b.

In the tire 10, the reinforcing member 28 is disposed as described above in order to reinforce the rigidity of the sidewall portion 10S. Further, the arrangement range R1 in the tire radial direction where the two-dimensional code 40 is provided overlaps the arrangement range R2 in the tire radial direction of the reinforcing member 28. In the present embodiment, the reinforcing member 28 is disposed, and the two-dimensional code 40 is stamped on the portion where the thickness of the sidewall portion 10S is increased. For this reason, even if the tire 10 rolls under load and the dot hole is deformed in accordance with the rolling, the deformation is reduced by the side rubber member 20 and the reinforcing member 28, and the deflection and distortion around the dot hole are increased. Suppress. For this reason, micro cracks are hardly generated around the dot holes, and the progress of the cracks is also suppressed. Therefore, the unevenness on the surface of the two-dimensional code 40 is changed with the long-term use of the tire, so that it is rarely difficult to identify the light and dark elements, and a decrease in the readability of the two-dimensional code 40 is suppressed.
On the other hand, when the arrangement range R1 of the two-dimensional code 40 does not overlap with the arrangement range R2 of the reinforcing member 28, the sidewall portion 10S has a small thickness, and thus the sidewall portion 10S has an effect of reducing the deformation of the dot holes. Becomes smaller and the microcracks tend to progress in the depth direction of the dot holes. Further, since the thickness of the sidewall portion 10S is small, the microcracks easily reach the carcass ply 12 that is the tire frame material located inside the side rubber member 20 due to the progress in the depth direction of the microcracks. From the viewpoint of durability of the tire 10, it is not preferable that the microcracks reach the carcass ply 12 that is the tire frame material.

  The reinforcing member 28 is a rubber member (first rubber member) that does not have reinforcing fibers such as organic fibers and metal fibers. For this reason, the reinforcing member 28 can be arranged in a wide range in the tire radial direction without excessively increasing the tire weight as compared with other reinforcing members having reinforcing fibers, and the sidewall portion 10S is arranged in the tire radial direction. Can be reinforced in a wide range of. As shown in FIG. 1, the reinforcing member 28 is disposed adjacent to the outer side in the tire width direction in the portion of the carcass ply 12 after being wound. Further, the outer end of the bead filler rubber member 22 in the tire radial direction is located within the arrangement range R2 of the reinforcing member 28.

The arrangement range R1 of the two-dimensional code 40 only needs to overlap at least a part of the arrangement range with the arrangement range R2 of the reinforcing member 28, but it is possible to increase the effect of suppressing an increase in deflection and distortion around the dot hole. According to an embodiment, the entire arrangement range R1 overlaps with the arrangement range R2 of the reinforcing member 28, that is, the arrangement range R1 of the two-dimensional code 40 is within the arrangement range R2 of the reinforcing member 28. preferable. Here, as shown in FIG. 1, the reinforcing member 28 has a shape in which the thickness gradually decreases at the end portion in the tire radial direction, and therefore the portion of the sidewall portion 10 </ b> S that overlaps the end portion of the reinforcing member 28. The thickness of the reinforcing member 28 is small, and the effect of suppressing the increase in deflection and distortion around the dot holes at both ends in the tire radial direction of the reinforcing member 28 is small compared to the portion between both ends in the tire radial direction. In this embodiment, in order to ensure the effect of suppressing the occurrence of cracks, the arrangement position along the tire radial direction of the blank region 44 of the two-dimensional code 40 is further determined by the tire diameter of the ends 28A and 28B of the reinforcing member 28. It is preferable that the arrangement position of the two-dimensional code 40 is determined so as not to overlap with the direction position.
Further, in the above-described embodiment, the distance A along the tire radial direction between the end 28A on the outer side in the tire radial direction of the reinforcing member 28 and the end 40A on the outer side in the tire radial direction of the two-dimensional cord 40, and the reinforcing member At least one of the distances B along the tire radial direction between the end 28B inside the tire radial direction 28 and the end 40B inside the tire radial direction of the two-dimensional code 40 is the length in the tire radial direction of the arrangement range R2 of the reinforcing member 28 It is preferable that the length is 0.5 to 2.5%, and it is more preferable that both the distances A and B are in the above range. Thereby, the effect of suppressing the occurrence of cracks in the two-dimensional code 40 and suppressing the deterioration of the readability is ensured.
Examples of ranges of distances A and B that satisfy the above range can include 2 to 10 mm, respectively.

According to one embodiment, in the arrangement range R2 of the reinforcing member 28 that overlaps the arrangement range R1 of the two-dimensional code 40, the thickness of the reinforcing member 28 is preferably 1 mm or more. If the thickness of the reinforcing member 28 is less than 1 mm, cracks generated in the two-dimensional cord 40 may develop and reach the carcass ply 12.
The distance between the bottom of the dot hole 40a and the carcass ply 12 is preferably 2.5 mm or more. The magnitude of this distance is easily secured when the thickness of the reinforcing member 28 is 1 mm or more.
Preferably, the thickness of the reinforcing member 28 is 1.1 to 1.5 mm in the arrangement range R2 of the reinforcing member 28 that overlaps the arrangement range R1 of the two-dimensional code 40.
In the arrangement range R2 of the reinforcing member 28, the ratio of the thickness of the reinforcing member 28 to the thickness of the side rubber member 20 is, for example, 0.2 to 0.6.

  According to one embodiment, the thickness of the side rubber member 20 located in the arrangement range R1 of the two-dimensional code 40 is preferably 2.5 mm or more. Since the side rubber member 20 has such a thickness, the effect of suppressing the occurrence of cracks and the development of cracks is reduced by reducing the deflection and strain acting on the dot holes 40a. A decrease in the readability of the generated two-dimensional code 40 can be suppressed.

According to one embodiment, the reinforcing member 28 is a first rubber member that is different from the side rubber member 20. With respect to rubber hardness (durometer hardness) in accordance with JIS K6253-3, the first rubber member is a side rubber member. It is preferably harder than the rubber member of the wall portion. Since the reinforcing member 28 has such rubber hardness, a sufficient effect of reinforcing the rigidity of the sidewall portion 10S can be obtained. In the present specification, the durometer hardness means a durometer hardness at 20 ° C. measured using a type A durometer in a durometer hardness test specified in JIS K6253-3.
In this embodiment, regarding the rubber hardness according to JIS K6253-3, when the rubber hardness of the sidewall portion 10S is Hs1 and the rubber hardness of the reinforcing member 28 is Hs2, it may be 1.3Hs1 <Hs2. More preferred.

According to one embodiment, as described above, it is preferable to further include a bead filler rubber member 22 located outside the bead core in the tire radial direction and disposed so as to be surrounded by a portion where the carcass ply is wound. In this embodiment, it is preferable that the first rubber member is softer than the bead filler rubber member 22 with respect to the rubber hardness according to JIS K6253-3. Thereby, in the portion of the tire 10 that extends from the bead portion 10B to the sidewall portion 10S, the rigidity distribution can be made favorable.
In this embodiment, regarding the rubber hardness in accordance with JIS K6253-3, when the rubber hardness of the reinforcing member 28 is Hs2 and the rubber hardness of the bead filler rubber member 22 is Hs3, 0.95Hs3> Hs2. Is more preferable.

  According to one embodiment, the surface of the sidewall portion 10S has a smooth region having no ridge, and the region of the sidewall portion 10S provided with the two-dimensional code 40 is surrounded by the smooth region. preferable. Specifically, the two-dimensional code 40 is preferably stamped on a smooth region where no ridge is formed, not on the ridge pattern region formed on the sidewall portion 10S. When the two-dimensional code 40 is engraved in the smooth region, a dark element is formed by the dot hole 40a, and a light element is formed by the smooth region without the dot hole 40a and the ridge. Can be emphasized. For this reason, it is preferable from the point of the improvement of the readability of the two-dimensional code 40 that the two-dimensional code 40 is imprinted in a smooth area.

  According to one embodiment, when the cross-sectional height along the tire radial direction from the innermost position in the tire radial direction of the bead core 16 to the tire maximum outer diameter position is SH (see FIG. 1), the tire of the bead core 16 The distance H along the tire radial direction from the innermost position in the radial direction to the center position M (see FIG. 1) in the tire radial direction of the two-dimensional code 40 is preferably 70% or less of the sectional height SH. . When the two-dimensional code 40 is engraved in a region where the distance H exceeds 70% of the cross-sectional height SH, the distortion caused by the flexural deformation becomes extremely large and cracks are likely to be generated in the dot holes 40a, and the cracks are also likely to progress. . In particular, the distance H is preferably 40% or less of the cross-sectional height SH.

  According to one embodiment, the two-dimensional code is preferably provided on each of the sidewall portions on both sides in the tire width direction of the pneumatic tire. Even when the tire 10 is mounted on the vehicle, the two-dimensional code 40 stamped on the side wall portion 10S on one side can be reliably read.

(Conventional example, comparative example, example)
In order to confirm the effect of the tire 10, a tire in which a two-dimensional code 40, specifically, a QR code (registered trademark) was imprinted on the sidewall portion 10S was manufactured. A tire 10 (tire size 195 / 65R15 91H) provided with a two-dimensional code 40 was mounted on a rim 15 × 6J. After irradiating the tire with ozone under the condition of ozone concentration of 100 pphm, the above concentration was performed while running an indoor drum (speed: 120 km / hour) by a low pressure test (XL: air pressure 160 kPa, load 100% LI) in accordance with FMVSS139. The ozone irradiation was performed at predetermined time intervals and allowed to run for 1.5 hours. This test reproduces deterioration of a tire due to long-term use of the tire.
For each of the conventional example, the comparative example, and the example, ten tires provided with the two-dimensional code 40 were prepared and the above test was performed.

The two-dimensional code 40 is read by a two-dimensional code reader, and the evaluation is A when the two-dimensional code 40 can be read without any problem when a predetermined illumination light is applied to the two-dimensional code 40 from a predetermined direction. Although it was able to be read, the case where it was able to be read by changing the method of applying illumination light for 1-2 tires was evaluated as B, and the method of applying illumination light was changed for 3-4 tires. The case where the reading can be performed is evaluated as C, the case where 5 to 6 tires are read by changing the method of applying illumination light is evaluated as D, and the case where the reading is performed is evaluated for 7 to 10 tires. Was evaluated as E, and evaluation F was defined as the case where at least one of the 10 tires could not be read. Evaluations A to E are acceptable and evaluation F is unacceptable.
Tables 1 to 3 below show the specifications and evaluation results.

In the following Tables 1 to 3, the two-dimensional code 40 is a side wall portion of a QR code (registered trademark) having a dot hole depth of 0.8 mm and a length of a unit cell for dividing a light and shade element of 0.6 mm. A 10S smooth surface was engraved.
Except for the specifications shown in Tables 1 to 3, it was as follows. The length of the arrangement range R2 of the reinforcing member 28 was 50 mm. In the comparative example, the arrangement range R1 of the two-dimensional code 40 is the outer side in the tire radial direction of the arrangement range of the reinforcing member. In Example 10, the two-dimensional code was imprinted in the ridge pattern region.
“Overlap of arrangement range” in the table means whether or not there is an overlap between the arrangement range of the two-dimensional code and the arrangement range of the reinforcing member. In the table, the distances A and B are positive numbers when the end in the tire radial direction of the two-dimensional code is within the arrangement range of the reinforcing member, and negative numbers when the end of the two-dimensional code is outside the arrangement range of the reinforcing member. It showed in. In the table, “thickness of the reinforcing member” means the thickness of the reinforcing member in the arrangement range of the reinforcing member 28 that overlaps the arrangement range of the two-dimensional code 40. In the table, “the thickness of the side rubber member” means the thickness of the side rubber member at the position where the two-dimensional code 40 is disposed. In the table, in the columns “Hs1 and Hs2 Magnitude Relationship” and “Hs3 and Hs2 Magnitude Relationship”, more specific magnitude relationships are indicated in parentheses as appropriate. In the table, “presence / absence of smooth region” means presence / absence of a smooth region surrounding the two-dimensional code 40.

As can be seen from the comparison between the conventional example and the comparative example and Examples 1 to 11, the two-dimensional code arrangement range and the reinforcing member arrangement range overlap, so that the two-dimensional code readability is improved.
As can be seen from a comparison between Example 3 and Example 4, when the thickness of the reinforcing member is 1 mm or more, the readability of the two-dimensional code is greatly improved.
As can be seen from the comparison between Example 4 and Example 5, when the side rubber member has a thickness of 2.5 mm or more, the readability of the two-dimensional code is improved.
As can be seen from a comparison between Example 10 and Example 5, the two-dimensional code is surrounded by a smooth region, so that the readability is greatly improved.
As can be seen from the comparison between Example 11 and Example 5, when the arrangement position of the two-dimensional code satisfies H <0.7SH, the readability of the two-dimensional code is greatly improved.

  The pneumatic tire of the present invention has been described in detail above. However, the pneumatic tire of the present invention is not limited to the above-described embodiment or examples, and various improvements and modifications can be made without departing from the gist of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 Pneumatic tire 10T Tread part 10S Side wall part 10B Bead part 12 Carcass ply 14 Belts 14a and 14b Belt material 16 Bead core 18 Tread rubber member 20 Side rubber member 22 Bead filler rubber member 24 Rim cushion rubber member 26 Inner liner rubber member 28 Reinforcement Members 28A, 28B Tire radial end 30 of reinforcing member Belt cover 40 Two-dimensional code 40A, 40B Two-dimensional code radial end 42 Dot pattern area 42a Data cell area 42b Cutout symbol area 44 Blank area

Claims (9)

A pair of annular bead cores;
At least one carcass ply provided to form a toroidal shape between the pair of bead cores;
A sheet-like reinforcing member arranged to be laminated on the outer side in the tire width direction with respect to the carcass ply;
A rubber member provided in contact with the carcass ply and the reinforcing member on the outer side in the tire width direction,
On the surface of the rubber member, there is provided a two-dimensional code in which a dot pattern is formed with two kinds of light and shade elements formed so as to be distinguishable from each other by surface irregularities,
The pneumatic tire is characterized in that an arrangement range in the tire radial direction provided with the two-dimensional code overlaps with an arrangement range in the tire radial direction of the reinforcing member. The arrangement range of the two-dimensional code is within the arrangement range of the reinforcing member,
A distance A along the tire radial direction between the end of the reinforcing member in the tire radial direction and the end of the two-dimensional code in the tire radial direction; and the end of the reinforcing member in the tire radial direction; At least one of the distances B along the tire radial direction with respect to the inner end of the dimension code in the tire radial direction is 0.5 to 2.5% of the length in the tire radial direction of the arrangement range of the reinforcing member. The pneumatic tire according to claim 1, wherein   The pneumatic tire according to claim 1 or 2, wherein a thickness of the reinforcing member is 1 mm or more in the arrangement range of the reinforcing member that overlaps the arrangement range of the two-dimensional code.   The pneumatic tire according to any one of claims 1 to 3, wherein a thickness of the rubber member positioned in the arrangement range of the two-dimensional code is 2.5 mm or more. The reinforcing member is a first rubber member different from the rubber member,
5. The pneumatic according to claim 1, wherein the first rubber member is harder than a rubber member of a sidewall portion of the pneumatic tire with respect to rubber hardness in accordance with JIS K6253-3. tire. A bead filler rubber member positioned outside the bead core in the tire radial direction and disposed so as to be surrounded by the carcass ply;
The pneumatic tire according to claim 5, wherein the first rubber member is softer than the bead filler rubber member with respect to rubber hardness according to JIS K6253-3. The surface of the sidewall portion of the pneumatic tire has a smooth region not having a ridge,
The pneumatic tire according to any one of claims 1 to 6, wherein an area of the sidewall portion provided with the two-dimensional code is surrounded by the smooth area.   When the cross-sectional height along the tire radial direction from the innermost position in the tire radial direction of the bead core to the maximum tire outer diameter position is SH, the two-dimensional code starts from the innermost position in the tire radial direction of the bead core. The pneumatic tire according to any one of claims 1 to 7, wherein a distance H along a tire radial direction to a center position in the tire radial direction is 70% or less of the cross-sectional height SH.   The pneumatic tire according to any one of claims 1 to 8, wherein the two-dimensional code is provided in each of sidewall portions on both sides in the tire width direction of the pneumatic tire.

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