JP2021195026A - Pneumatic tire and tire set - Google Patents

Abstract

To inhibit incorrect attachment of a pneumatic tire to a vehicle.SOLUTION: A pneumatic tire 10 includes a tread 2 formed with circumferential grooves 10 extending in a tire circumferential direction. The circumferential groove 10 is defined by a first side wall surface 10a located at one side in a tire width direction TW; a second side wall surface 10b located at the other side in the tire width direction TW; and a bottom wall surface 10c which is continuous with inner ends as seen in a tire radial direction TR of the first side wall surface 10a and the second side wall surface 10b. A color of the first side wall surface 10a is different from a color of rubber forming the tread 2 and a color of the second side wall surface 10b.SELECTED DRAWING: Figure 1

Description

The present invention relates to pneumatic tires and tire sets.

Pneumatic tires include a tread with a circumferential groove extending in the circumferential direction of the tire. The circumferential groove is defined by a pair of side wall surfaces located at intervals in the tire width direction and a bottom wall surface connected to the inner end in the tire radial direction of each of the pair of side wall surfaces. The pneumatic tire disclosed in Patent Document 1 is provided with an identification line on the side wall surface of the circumferential groove for the purpose of discriminating the degree of wear of the tread. The identification line is formed in a color different from that of the rubber constituting the tread.

Japanese Unexamined Patent Publication No. 2014-125119

When mounting pneumatic tires on a vehicle, it may be necessary to pay attention to the placement of the pneumatic tires inside and outside the vehicle. However, in Patent Document 1, since nothing is considered about the arrangement of the pneumatic tire, the tire may be erroneously mounted in an incorrect arrangement with respect to the vehicle. Therefore, the pneumatic tire of Patent Document 1 has room for improvement in terms of measures against erroneous mounting on a vehicle.

An object of the present invention is to make it possible to suppress erroneous mounting of pneumatic tires on a vehicle.

One aspect of the present invention comprises a tread in which a circumferential groove extending in the tire circumferential direction is formed, and the circumferential groove is a first side wall surface located on one side in the tire width direction and the other side in the tire width direction. It is defined by a second side wall surface located in the tire and a bottom wall surface connected to the inner end of each of the first side wall surface and the second side wall surface in the tire radial direction, and the color of the first side wall surface is the tread. Provided is a pneumatic tire different from the color of the constituent rubber and the color of the second side wall surface.

In this embodiment, the color of the first side wall surface located on one side in the tire width direction is different from the color of the rubber constituting the tread and the color of the second side wall surface. Therefore, it is possible to easily determine the correctness of the arrangement of the pneumatic tires depending on whether or not the color of the first side wall surface can be seen from the outside of the vehicle in the mounted state on the vehicle. Therefore, it is possible to prevent the erroneous mounting of the pneumatic tire on the vehicle. In addition, workability when mounting pneumatic tires on the vehicle can be improved.

The tread defines the tire rotation direction when the vehicle moves forward.

In this embodiment, since the tire rotation direction is determined, when all the pneumatic tires are mounted in the correct arrangement (orientation) with respect to the inside and outside of the vehicle, the first side wall surface is visually observed from the outside on one of the left and right sides of the vehicle. On the other hand, the second side wall surface can be visually recognized from the outside. That is, since the correctness of the arrangement of the pneumatic tires can be easily determined depending on whether the color of the circumferential groove seen from the outside of the vehicle is different on the left and right, it is possible to suppress the incorrect mounting of the pneumatic tires on the vehicle.

The tread is arranged so that the first side wall surface is located inside in the vehicle width direction and the second side wall surface is located outside in the vehicle width direction.

In this embodiment, the arrangement of the pneumatic tires is defined for the inside and outside of the vehicle. Therefore, when all the pneumatic tires are installed in the correct arrangement for the vehicle, only the first side wall surface is visually observed from the outside on either the left or right side of the vehicle. can. That is, since the correctness of the arrangement of the pneumatic tire can be easily determined by whether or not the color of the first side wall surface can be seen, it is possible to suppress the incorrect mounting of the pneumatic tire on the vehicle.

The color of the second side wall surface is the same as the color of the rubber of the tread.

In this embodiment, since the color of the second side wall surface is the same as the color of the rubber of the tread, it is not necessary to color the second side wall surface by applying paint or the like. Therefore, when manufacturing a pneumatic tire, the step of coloring the second side wall surface is unnecessary, so that the productivity can be improved.

The color of the second side wall surface is different from the color of the rubber of the tread.

In this embodiment, since the color of the second side wall surface is different from the color of the rubber of the tread, it is possible to improve the distinctiveness of whether or not the second side wall surface is visible from the outside of the vehicle. Therefore, it is possible to improve the workability of determining the incorrect mounting of the pneumatic tire on the vehicle.

Another aspect of the present invention comprises a tread in which a circumferential groove extending in the tire circumferential direction is formed, and the circumferential groove is a first side wall surface located on one side in the tire width direction and the other side in the tire width direction. It is defined by a second side wall surface located on the side and a bottom wall surface connected to the inner end of each of the first side wall surface and the second side wall surface in the tire radial direction, and the color of the first side wall surface is the tread. Provided is a tire set comprising a plurality of pneumatic tires different from the color of the rubber constituting the tire and the color of the second side wall surface, and the color of the first side wall surface of the plurality of pneumatic tires is different from each other.

In this embodiment, the color of the first side wall surface located on one side in the tire width direction is different from the color of the rubber constituting the tread and the color of the second side wall surface. It is possible to suppress the erroneous installation of. Further, the colors of the first side wall surfaces of the plurality of pneumatic tires are different from each other. Therefore, during tire rotation for the purpose of uniform wear, the arrangement of a plurality of pneumatic tires with respect to the vehicle can be controlled by color, so that one of the plurality of pneumatic tires is excessively worn. Accidental installation can be suppressed.

In the present invention, it is possible to suppress erroneous mounting of pneumatic tires on a vehicle.

Sectional drawing of the pneumatic tire which concerns on 1st Embodiment of this invention. FIG. 1 is a partially developed view showing the tread of the pneumatic tire of FIG. FIG. 3 is an enlarged cross-sectional view of part III of FIG. The schematic diagram which shows the mounting state to a vehicle. The cross-sectional view which shows the part of the pneumatic tire of 2nd Embodiment. The partial development view which shows the tread of the pneumatic tire of 3rd Embodiment. The schematic diagram which shows the state after rotation of the pneumatic tire of 4th Embodiment. The schematic which shows the recommended rotation sheet.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 shows a pneumatic tire (hereinafter, simply referred to as “tire”) 1 according to the first embodiment of the present invention. As shown in FIG. 1, the tire 1 includes a tread 2, a pair of sidewalls 3A, 3B, and a pair of bead portions 4A, 4B.

The tread 2 has a cylindrical shape, extends in the tire width direction TW, and extends in the tire circumferential direction. Of the tread 2, the tread surface located on the outermost side of the tire radial TR is formed with an annular circumferential groove 10 recessed toward the tire radial inner TRi and extending in the tire circumferential direction. A plurality of circumferential grooves 10 are provided at intervals in the tire width direction TW.

The sidewalls 3A and 3B are annular, respectively, connected to both ends of the TW in the tire width direction of the tread 2, and extend to the inner TRi in the tire radial direction. In the present specification, the boundaries between the tread 2 and the sidewalls 3A and 3B are tangential portions that are in contact with the top of the inner peripheral surface of the tread 2 and are drawn so as to extend in the tire width direction TW.

The bead portions 4A and 4B are annular, respectively, and are connected to the inner ends of the tire radial TRs of the sidewalls 3A and 3B, respectively. The bead portions 4A and 4B are fitted to the rims of wheels (not shown), respectively.

The tire 1 having the above basic structure is assembled to a wheel and mounted on the vehicle 20 via the wheel (see FIG. 4). When the tire 1 is mounted on the vehicle 20, the circumferential groove 10 of the present embodiment includes a coloring portion 15 for confirming the placement of the tire 1 in order to suppress the mounting of the tire 1 in a different arrangement from the designated one. .. The mounting of the tire 1 on the vehicle 20 includes the mounting of the tire 1 on the wheel.

Hereinafter, the configuration of the tread 2 will be described more specifically. In the present specification, the inside of the tire width direction TW means the tire equatorial line CL side. The outside of the tire width direction TW means the direction away from the tire equatorial line CL, and in the tire 1 of FIG. 1, it is the left side on the sidewall 3A side in FIG. 1 and the sidewall 3B side in FIG. There is a right side. Further, in the present specification, the left side on the sidewall 3A side in FIG. 1 is one side of the tire width direction TW, and the right side on the sidewall 3B side in FIG. 1 is the other side of the tire width direction TW.

As shown in FIGS. 1 and 2, the tread 2 has a plurality of (five in the present embodiment) ribs arranged side by side in the tire width direction TW by a plurality of (four in the present embodiment) circumferential grooves 10. (Land part) 11 is provided. In the following description, among the plurality of circumferential grooves 10, 10A, 10B, 10C, and 10D may be referred to in order from the leftmost side in FIGS. 1 and 2 to the right side. Further, among the plurality of ribs 11, 11A, 11B, 11C, 11D, 11E may be referred to in order from the leftmost side in FIGS. 1 and 2 to the right side.

The rib 11A is a shoulder rib formed on the left TWa in the tire width direction with respect to the circumferential groove 10A. The rib 11B is a quarter rib formed between the circumferential grooves 10A and 10B. The rib 11C is a center rib formed between the circumferential grooves 10B and 10C. The rib 11D is a quarter rib formed between the circumferential grooves 10C and 10D. The rib 11E is a shoulder rib formed on the right TWb in the tire width direction with respect to the circumferential groove 10D.

The ribs 11A to 11E are formed with narrow grooves 12A to 12E that are recessed from the outside to the inside of the tire radial direction TR and extend in the tire width direction TW, respectively. The narrow grooves 12A to 12E of the present embodiment are formed so that the tire rotation direction RD when the vehicle is moving forward exhibits the directional pattern designated upward in FIG.

Specifically, a plurality of narrow grooves 12A to 12E are provided at intervals in the tire circumferential direction. The narrow groove 12C formed in the rib 11C includes a first groove and a second groove having different inclination directions. These are inclined in the direction opposite to the tire rotation direction RD from the tire equatorial line CL side toward the outside of the tire width direction TW. The narrow grooves 12A, 12B, 12D, 12E formed in the ribs 11A, 11B, 11D, and 11E are inclined in the direction opposite to the tire rotation direction RD from the tire equatorial line CL side toward the outside of the tire width direction TW, respectively. is doing. The narrow grooves 12A to 12C located on the left side TWa in the tire width direction from the tire equatorial line CL and the fine grooves 12E to 12C located on the right side TWb in the tire width direction from the tire equatorial line CL are axes of symmetry of the tire equatorial line CL. As axisymmetric.

FIG. 4 shows a state in which the vehicle 20 is viewed from above in the vertical direction. In the tire 1 provided with the narrow grooves 12A to 12E as described above, the rib 11A located on the left side in FIG. 2 is located on the left side of the vehicle width direction CW, and the rib 11E located on the right side in FIG. 2 is the vehicle width direction CW. It needs to be mounted on the vehicle 20 so that it is located on the right side. That is, for the two tires 1A and 1B located on the left side in FIG. 4, the rib 11A is located outside the vehicle width direction CW and the rib 11E is located inside the vehicle width direction CW. It will be installed. Further, regarding the two tires 1C and 1D located on the right side in FIG. 4, the rib 11A is located inside the vehicle width direction CW and the rib 11E is located outside the vehicle width direction CW. It will be installed. As a result, when the vehicle 20 moves forward, the tire 1 rotates in the designated tire rotation direction (direction) RD. The inside of the vehicle width direction CW means the side of the vehicle center line CCL, and the outside of the vehicle width direction CW means the direction away from the vehicle center line CCL.

As shown in FIGS. 1 and 3, the coloring portion 15 is provided so as to be located on the left side (one side) TWa of the plurality of circumferential grooves 10 in the tire width direction. However, the coloring portion 15 may be provided in only one of the plurality of circumferential grooves 10A to 10D. More specifically, it is as follows.

The circumferential groove 10 is defined by a first side wall surface 10a located on the left side TWa in the tire width direction, a second side wall surface 10b located on the right side TWb in the tire width direction, and a bottom wall surface 10c located on the inner TRi in the tire radial direction. Has been done.

The first side wall surface 10a and the second side wall surface 10b are located at intervals in the tire width direction TW and extend in the tire radial direction TR, respectively. The first side wall surface 10a constitutes a wall of ribs 11A to 11D located on the left side TWa of the circumferential groove 10A to 10D in the tire width direction. The second side wall surface 10b constitutes a wall of ribs 11B to 11E located on the right TWb in the tire width direction of the circumferential grooves 10A to 10D. The side wall surfaces 10a and 10b of the present embodiment are continuous with the outer surface 11a of the rib 11 via a connecting radius portion 10d having a predetermined curvature, respectively.

The bottom wall surface 10c is connected to the inner end of each of the side wall surfaces 10a and 10b in the tire radial direction TR, and extends in the tire width direction TW. The bottom wall surface 10c of the present embodiment is continuous with the side wall surfaces 10a and 10b, respectively, via a connecting radius portion 10e having a predetermined curvature.

The groove width GW of the circumferential groove 10, that is, the distance of the tire width direction TW from the first side wall surface 10a to the second side wall surface 10b is set to 5 mm or more and 25 mm or less. If the groove width GW is made excessively narrow, drainage cannot be ensured, and when the circumferential groove 10 is viewed from the outside of the tire width direction TW, it becomes difficult to visually recognize the first side wall surface 10a or the second side wall surface 10b. .. If the groove width GW is made excessively wide, the area of the rib 11 that touches the road surface cannot be secured. In order to prevent these inconveniences, it is preferable to set the groove width GW within the above-defined range.

The colored portion 15 constitutes the outer surface of the first side wall surface 10a. The colored portion 15 is formed with a color different from the color of the rubber constituting the outer surface 11a of the rib 11. More preferably, the colored portion 15 is formed with a color that makes it easy to distinguish the rib 11 from the outer surface 11a in consideration of lightness and saturation. For example, since the rubber color of the outer surface 11a is generally black, white, red, blue, green, yellow, brown, purple, silver, gold, and a pale color can be used as the color of the colored portion 15. ..

The colored portion 15 is not provided on the portion of the circumferential groove 10 other than the first side wall surface 10a, that is, the second side wall surface 10b and the bottom wall surface 10c. Therefore, the color of the second side wall surface 10b and the bottom wall surface 10c is the same color as the outer surface 11a of the rib 11 (generally black).

The colored portion 15 is composed of an ink layer composed of an identification color ink (paint) applied to the outer surface of the green tire before vulcanization. As the color ink, an ink having a predetermined viscosity and a predetermined solid content can be used. However, the colored portion 15 is not limited to the ink layer, and may be a colored rubber layer colored with a pigment or a dye. Further, the coloring portion 15 may be provided after the vulcanization molding of the tire 1.

The colored portion 15 of the present embodiment is provided on the entire surface of the annular first side wall surface 10a including the connection radius portions 10d and 10e connected to the first side wall surface 10a. That is, the coloring portion 15 is provided from the outer end to the inner end of the tire radial direction TR of the first side wall surface 10a including the connection radius portions 10d and 10e.

However, a plurality of colored portions 15 may be provided intermittently with respect to the first side wall surface 10a at intervals in the tire circumferential direction. Further, the coloring portion 15 may be provided only on a part of the tire radial direction TR of the first side wall surface 10a. Further, the coloring portion 15 may not be provided in the connection radius portions 10d and 10e.

When the colored portion 15 is provided only on a part of the tire radial TR on the first side wall surface 10a, the dimension (height) of the tire radial TR on the first side wall surface 10a including the connection radius portions 10d and 10e, that is, the groove depth. The ratio of the dimension (width) of the tire radial direction TR of the colored portion 15 to the GD (for example, 8 mm) is preferably 50% or more. This is because if the width of the colored portion 15 is excessively narrowed, it becomes difficult to identify the colored portion 15 from the outside of the TW in the tire width direction.

When the colored portion 15 is provided only on a part of the tire radial direction TR of the first side wall surface 10a, the coloring portion 15 may be provided on the outer diameter side of the first side wall surface 10a or on the inner diameter side of the first side wall surface 10a. May be done. When the colored portion 15 is provided on the outer diameter side, the colored portion 15 can be easily identified when the circumferential groove 10 is viewed from the outside of the tire width direction TW. When the colored portion 15 is provided on the inner diameter side, the colored portion 15 can be identified even when the tire 1 which has been used for a certain period of time and the tread 2 has been worn to some extent is rotated. When the colored portion 15 is provided on the entire surface of the first side wall surface 10a, both effects can be obtained.

When the tire 1 configured in this way is mounted in the correct arrangement (orientation) with respect to the vehicle 20, the first side wall surface 10a can be visually recognized when the tire 1 is viewed from the right outer side of the left and right sides of the vehicle 20, and the first side wall surface 10a can be seen from the left outer side. Looking at the tire 1, the second side wall surface 10b can be visually recognized. That is, when the circumferential groove 10 is viewed from the right outer side of the vehicle 20, the colored portion 15 can be visually recognized, and when the circumferential groove 10 is viewed from the left outer side of the vehicle 20, the colored portion 15 cannot be visually recognized. Therefore, it is possible to easily determine whether the tire 1 is arranged correctly or not depending on whether the color of the circumferential groove 10 seen from the outside of the vehicle 20 is different on the left and right.

The pneumatic tire 1 configured in this way has the following features.

The color of the first side wall surface 10a located on one side of the tire width direction TW is different from the color of the rubber constituting the tread 2 and the color of the second side wall surface 10b located on the other side of the tire width direction TW. Therefore, it is possible to easily determine whether the tire 1 is arranged correctly or not depending on whether or not the color of the first side wall surface 10a can be seen from the outside of the vehicle 20 in the mounted state on the vehicle 20. Therefore, it is possible to prevent the tire 1 from being erroneously mounted on the vehicle 20. In addition, workability when mounting the tire 1 on the vehicle 20 can be improved. Moreover, when the mounting of the tire 1 on the vehicle 20 is automated by a machine, the color of the first side wall surface 10a can be identified by image analysis, so that the correctness determination of the arrangement of the tire 1 can be automated.

The tire rotation direction RD when the vehicle is moving forward is defined. Therefore, when all the tires 1 are mounted in the correct arrangement (orientation) with respect to the inside and outside of the vehicle 20, the first side wall surface 10a can be visually recognized from the outside on one side of the left and right sides of the vehicle 20, and the second side wall surface 10a can be visually recognized from the outside on the other side. 10b can be visually observed. That is, since the correctness of the arrangement of the tire 1 can be easily determined depending on whether the color of the circumferential groove 10 seen from the outside of the vehicle 20 is different on the left and right, it is possible to suppress the erroneous mounting of the tire 1 on the vehicle 20.

The color of the second side wall surface 10b is the same as the rubber color of the tread 2. Therefore, it is not necessary to color the second side wall surface 10b by applying a paint or the like. Therefore, when the tire 1 is manufactured, the step of coloring the second side wall surface 10b is unnecessary, so that the productivity can be improved.

(Second Embodiment)
FIG. 5 shows a circumferential groove 10 formed in the tire 1 of the second embodiment. The tire 1 of the second embodiment is different from the tire 1 of the first embodiment in that the side wall surfaces 10a and 10b defining the circumferential groove 10 are provided with the colored portions 15 and 16, respectively, and the other configurations are the first. 1 It is the same as the tire 1 of the embodiment.

Specifically, the configuration of the coloring portion 15 formed on the first side wall surface 10a is the same as that of the first embodiment. The bottom wall surface 10c is not provided with a colored portion.

The colored portion 16 constitutes the outer surface of the second side wall surface 10b. The color of the colored portion 16 is different from the colored portion 15 of the first side wall surface 10a in that the color of the colored portion 16 is different from the rubber color of the outer surface 11a of the rib 11 and the color of the colored portion 15 of the first side wall surface 10a. Other configurations are the same as those of the colored portion 15 of the first side wall surface 10a.

The color that can be used as the coloring portion 16 is the same as the color that can be used as the coloring portion 15. Among them, the colored portions 15 and 16 are set to different colors in a combination having good distinguishability. For example, the colored portion 15 is red and the colored portion 16 is blue.

When the tire 1 configured in this way is mounted in the correct arrangement (orientation) with respect to the vehicle 20, the colored portion 15 can be visually recognized by looking at the circumferential groove 10 from the right outer side of the vehicle 20, and the peripheral direction is seen from the left outer side of the vehicle 20. Looking at the directional groove 10, the colored portion 16 can be visually recognized. That is, the correctness of the arrangement of the tire 1 can be easily determined depending on whether or not the color of the circumferential groove 10 seen from the outside of the vehicle 20 is different on the left and right. Therefore, the same actions and effects as those of the first embodiment can be obtained.

Moreover, in the second embodiment, since the color of the second side wall surface 10b is different from the rubber color of the tread 2, it is possible to improve the distinctiveness of whether or not the second side wall surface 10b is visible from the outside of the vehicle 20. .. Further, since the colors of the colored portions 15 and 16 are different, there is no misunderstanding. Therefore, it is possible to improve the workability of determining that the tire 1 is erroneously mounted on the vehicle 20.

(Third Embodiment)
FIG. 6 shows the tire 1 of the third embodiment. The tire 1 of the third embodiment is different from the tire 1 of the first embodiment in that the narrow grooves 12A to 12E are formed in the ribs 11A to 11E of the tread 2 so as to exhibit an asymmetric pattern.

Specifically, as shown in FIG. 6, the tread 2 includes a plurality of ribs (land portions) 11A to 11E juxtaposed in the tire width direction TW by the circumferential grooves 10A to 10D. The ribs 11A to 11E are formed with narrow grooves 12A to 12E that are recessed from the outside to the inside of the tire radial direction TR, respectively. A plurality of these are provided at intervals in the tire circumferential direction.

The narrow groove 12A formed in the rib 11A includes a first groove and a second groove having different widths in the tire circumferential direction. These are inclined upward to the right from the left side to the right side in the tire width direction TW in FIG. The narrow grooves 12B formed in the ribs 11B include a first groove inclined upward to the right from the left end of the tire width direction TW of the rib 11B and a second groove inclined downward to the left from the right end of the tire width direction TW of the rib 11B. To prepare for. The narrow groove 12C formed in the rib 11C includes a first portion inclined upward to the right from the left end of the tire width direction TW of the rib 11C, and a second portion extending in the tire circumferential direction from the right end of the first portion. The narrow groove 12D formed in the rib 11D extends in the tire circumferential direction at the center of the tire width direction TW of the rib 11D. The narrow groove 12E formed in the rib 11E extends substantially in the tire width direction TW.

The tread 2 in which the fine grooves 12A to 12E having different shapes are formed for the individual ribs 11A to 11E has an asymmetrical shape as a whole (asymmetric pattern). Therefore, in the tread 2, the first side wall surface 10a is located inside the vehicle width direction (vehicle center line CCL side) CWi, and the second side wall surface 10b is located outside the vehicle width direction (side away from the vehicle center line CCL) CWo. The arrangement is defined so that it does. In other words, with respect to the vehicle 20 shown in FIG. 4, the rib 11A located on the left side in FIG. 6 is located on the inner CWi in the vehicle width direction, and the rib 11E located on the right side in FIG. 6 is located on the outer CWo in the vehicle width direction. The arrangement of the tire 1 is specified. That is, the ribs 11A are located on the inner CWi in the vehicle width direction, and the ribs 11E are located on the outer CWo in the vehicle width direction, so that the four tires 1A to 1D are mounted on the vehicle 20. However, the tire 1 is not specified in the tire rotation direction, and rotation in either the first rotation direction RD1 or the second rotation direction RD2 is permitted.

Of the treads 2 having such an asymmetric pattern, each of the circumferential grooves 10 is provided with a colored portion 15 for confirming the arrangement of the tire 1. Similar to the first embodiment shown in FIG. 3, the coloring portion 15 is provided so as to be located on the left side (one side) TWa of the plurality of circumferential grooves 10 in the tire width direction. However, the coloring portion 15 may be provided in only one of the plurality of circumferential grooves 10A to 10D.

When the tire 1 configured in this way is mounted on the vehicle 20 in the correct arrangement, only the first side wall surface 10a can be visually recognized from the outside on either the left or right side of the vehicle 20. That is, when the circumferential groove 10 is viewed from the outside of the vehicle 20, the colored portion 15 can be visually recognized. Therefore, it is possible to easily determine whether the tire 1 is arranged correctly or not depending on whether or not the color of the first side wall surface 10a can be seen. Therefore, the same actions and effects as those of the first embodiment can be obtained.

(Modified example of the third embodiment)
The tread 2 may be arranged so that the side wall surface 10a is located on the outer side CWo in the vehicle width direction and the side wall surface 10b is located on the inner side CWi in the vehicle width direction. That is, the tire for the vehicle 20 shown in FIG. 4 so that the rib 11A located on the left side in FIG. 6 is located on the outer CWo in the vehicle width direction and the rib 11E located on the right side in FIG. 6 is located on the inner CWi in the vehicle width direction. The arrangement of 1 may be specified. In this case, when mounted on the vehicle 20 in the correct arrangement, only the second side wall surface 10b can be visually recognized from the outside. That is, when the circumferential groove 10 is viewed from the outside of the vehicle 20, the colored portion 15 cannot be visually recognized. Therefore, even in this case, since the correctness of the arrangement of the tire 1 can be easily determined, the same operation and effect as those of the first embodiment can be obtained.

As described above, in the case of the tire 1 having an asymmetric pattern, if all the tires 1 are mounted on the vehicle 20 in the correct arrangement, only the first side wall surface 10a or the second side wall surface 10b can be seen from the outside on either the left or right side of the vehicle 20. It can be seen visually. Therefore, since the correctness of the arrangement of the tire 1 can be easily determined depending on whether or not the color of the first side wall surface 10a can be seen, it is possible to suppress the erroneous mounting of the tire 1 on the vehicle 20.

(Other Modifications of the Third Embodiment)
Similar to the second embodiment shown in FIG. 5, the tire 1 of the third embodiment may be provided with colored portions 15 and 16 having different colors on the side wall surfaces 10a and 10b defining the circumferential groove 10. In this case, since it is possible to easily determine whether the tire 1 is arranged correctly or not depending on whether or not the colors of the circumferential grooves 10 seen from the outside of the vehicle width direction CW are all the same, the tire 1 is erroneously mounted on the vehicle 20. Can be suppressed. Moreover, since the distinctiveness can be improved as in the second embodiment, the workability of determining the erroneous mounting of the tire 1 on the vehicle 20 can be improved.

(Fourth Embodiment)
FIG. 7 shows a state in which the tire 1 of the fourth embodiment used for a certain period of time in the arrangement shown in FIG. 4 is rotated. In this fourth embodiment, four tires 1A to 1D are configured as a set of tires. The tire rotation is performed for one purpose of equalizing the wear of the tires 1A to 1D.

The individual tires 1A to 1D have the same configuration as the tire 1 of the third embodiment, have the colored portion 15 only on the first side wall surface 10a as shown in FIG. 3, and have an asymmetric pattern as shown in FIG. Tread 2 is provided. Of the four tires 1A to 1D, the colors of the colored portion 15 of the first side wall surface 10a included in each of the four tires 1A to 1D are all different. For example, the color of the colored portion 15 of the tire 1A is red, the color of the colored portion 15 of the tire 1B is blue, the color of the colored portion 15 of the tire 1C is green, and the color of the colored portion 15 of the tire 1D is. It is yellow. However, the colors of the colored portions 15 of the tires 1A to 1D can be changed as needed as long as they have a color scheme that is easy to identify.

FIG. 8 shows a recommended rotation table 25 for tires 1A to 1D. This recommended rotation table 25 describes the arrangement when newly mounting the unused tires 1A to 1D and the arrangement when rotating the tires 1A to 1D which have been used for a certain period of time. Next to each of the tires 1A to 1D, the color of the colored portion 15 is described instead of the reference numeral.

In each tire 1 constituting the tire set, the color of the first side wall surface 10a located on one side of the tire width direction TW is different from the color of the rubber constituting the tread 2 and the color of the second side wall surface 10b. , It is possible to suppress erroneous mounting on the vehicle 20 as in the third embodiment.

Further, the colors of the first side wall surfaces 10a of the tires 1A to 1D are different from each other. Therefore, since the arrangement of the plurality of tires 1A to 1D with respect to the vehicle 20 can be managed by color, it is possible to suppress erroneous mounting in which any one of the plurality of tires 1A to 1D is excessively worn. For example, it is possible to suppress erroneous mounting in which the arrangement before rotation and the arrangement after rotation are in the same position. Moreover, when the mounting of the tire 1 on the vehicle 20 is automated by a machine, the color of the first side wall surface 10a can be identified by image analysis, so that the correctness determination of the arrangement of the tire 1 can be automated.

The pneumatic tire 1 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

For example, even in the tire 1 having the directional patterns shown in the first embodiment and the second embodiment, four tires are set as a set of tires as in the fourth embodiment, and the colored portions 15 and 16 of the respective tires 1 are used. May be different colors to form the recommended rotation table 25.

The tread 2 is not limited to a rib pattern having a rib 11 extending in the tire circumferential direction, and in addition to the circumferential groove 10, a plurality of lateral grooves extending in the tire width direction TW are provided at intervals in the tire circumferential direction, and the circumferential groove 10 is provided. It may be composed of a block pattern partitioned by a tire and a lateral groove.

The tire 1 is not limited to the directional pattern in which the tire rotation direction RD is specified and the asymmetric pattern in which the internal / external arrangement of the vehicle 20 is specified, and is a directional asymmetric pattern in which both the directional and the internal / external arrangement of the vehicle are specified. You may. Further, the tire 1 may have a general-purpose pattern in which neither the directionality nor the arrangement inside and outside the vehicle is specified.

1,1A ~ 1D Pneumatic tire 2 Tread 3A, 3B Side wall 4A, 4B Bead part 10,10A-10D Circumferential groove 10a First side wall surface 10b Second side wall surface 10c Bottom wall surface 10d, 10e Connection radius part 11,11A ~ 11E Rib 11a Outer surface 12A ~ 12E Fine groove 15, 16 Colored part 20 Vehicle 25 Recommended rotation table CL Tire equatorial line TW Tire width direction TWa Tire width direction left side (one side)
TWb tire width direction right side (other side)
TR tire radial direction TRi tire radial direction inside TRo tire radial direction outside RD tire rotation direction CW vehicle width direction CCL vehicle center line

Claims (6)

Equipped with a tread with a circumferential groove extending in the tire circumferential direction,
The circumferential groove is a tire having a first side wall surface located on one side in the tire width direction, a second side wall surface located on the other side in the tire width direction, and the first side wall surface and the second side wall surface. It is defined by the bottom wall surface that connects to the inner end in the radial direction.
The color of the first side wall surface is different from the color of the rubber constituting the tread and the color of the second side wall surface.
Pneumatic tires. The pneumatic tire according to claim 1, wherein the tread is a tire rotation direction when the vehicle is moving forward. The air according to claim 1 or 2, wherein the tread is arranged so that the first side wall surface is located inside in the vehicle width direction and the second side wall surface is located outside in the vehicle width direction. Tires with tread. The pneumatic tire according to any one of claims 1 to 3, wherein the color of the second side wall surface is the same as the color of the rubber of the tread. The pneumatic tire according to any one of claims 1 to 3, wherein the color of the second side wall surface is different from the color of the rubber of the tread. Equipped with a tread with a circumferential groove extending in the tire circumferential direction,
The circumferential groove is a tire having a first side wall surface located on one side in the tire width direction, a second side wall surface located on the other side in the tire width direction, and the first side wall surface and the second side wall surface. It is defined by the bottom wall surface that connects to the inner end in the radial direction.
The color of the first side wall surface includes a plurality of pneumatic tires different from the color of the rubber constituting the tread and the color of the second side wall surface.
The color of the first side wall surface of the plurality of pneumatic tires is different from each other.
Tire set.

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