JP5968612B2 - tire - Google Patents

Description

  The present invention relates to a tire.

  2. Description of the Related Art Conventionally, as shown in Patent Document 1 below, for example, a tire is known in which a tread tread surface portion is provided with groove portions that are individually opened at both ends of the tread tread surface portion in the tire width direction. The groove portion extends in the tire width direction, and extends from one side of the tire circumferential direction toward the other side in the middle of the tire width direction from one side to the other side in the tire width direction, and thereafter the tire circumferential direction. It extends so as to be reversed from the other side to the one side.

JP 2011-156905 A

  However, the conventional tire has room for improvement in improving drainage.

  This invention is made | formed in view of the situation mentioned above, Comprising: The objective is to provide the tire which can improve drainage.

In order to solve the above problems, the present invention proposes the following means.
The tire according to the present invention is a tire in which a plurality of groove portions that are individually opened at both ends in the tire width direction of the tread tread surface portion are arranged at intervals in the tire circumferential direction on the tread tread surface portion. While the groove portion extends from one side of the tire circumferential direction toward the other side, and extends in the same direction along the tire width direction, the groove portion extends to both ends of the tread tread surface portion in the tire width direction. separately in optimum Rutotomoni, the land portion is defined between the grooves adjacent to each other in the tire circumferential direction, the groove portion, the narrowed portion of the narrow than other portions in the groove is provided, wherein the constriction portion A pair of the groove portions so as to be positioned between both end portions in the tire circumferential direction located at both ends in the tire width direction of the tread tread portion and a central portion in the tire circumferential direction located on the tire equator portion. is arranged, the land portion, the bets Characterized in that it extends continuously over the entire length of the tire width direction of the head tread portion.

According to the present invention, the groove portion extends from one side of the tire circumferential direction toward the other side, and reaches each end of the tread tread surface portion in the tire width direction. It becomes possible to make the water flow smoothly and to be discharged to the outside in the tire width direction, and the drainage can be improved.
In addition, since the narrowed portion is provided in the groove portion, the occupied area of the groove portion in the tread tread surface portion is suppressed, and the land portion partitioned by the tread tread surface portion is secured by the groove portion so that the land portion having high rigidity is secured. Therefore, it is possible to easily secure the cornering force of the tire.
As mentioned above, according to the said tire, drainage can be improved, ensuring a cornering force.

In addition , since the narrow portion is disposed in a pair so as to be positioned between both end portions and the center portion in the tire circumferential direction of the groove portion, a long distance between the pair of narrow portions is ensured, and the tread It is possible to easily increase the rigidity of the land portion at each of the portions separated from each other on the tread surface portion, and it is possible to further ensure the cornering force of the tire.

Further, the tire according to the present invention is a tire in which groove portions that are individually opened at both ends in the tire width direction of the tread tread surface portion are disposed on the tread tread surface portion, and the groove portion is one side in the tire circumferential direction. Extending toward the other side of the tread, and reaching each end in the tire width direction of the tread tread surface portion, and the groove portion is provided with a narrowed portion narrower than other portions in the groove portion, and the narrowed portion The portion of the groove portion is located between both end portions in the tire circumferential direction located at both ends in the tire width direction of the tread tread portion and a central portion in the tire circumferential direction located on the tire equator portion. In the tire plan view when the tire is viewed from the outside in the tire radial direction, the groove width center line in the narrowed portion is the groove width in the end portion and the central portion in the tire circumferential direction. Than the center line, Thailand The inclination angle formed with respect to the reference line extending along the circumferential direction is small, and the wall surface defining the narrowed portion extends from the bottom wall surface facing the outer side in the tire radial direction toward the outer side in the tire radial direction. The paired side wall surfaces may be configured to contact each other when a land portion partitioned by the groove portion into the tread tread surface portion is elastically deformed.

  In this case, in the tire plan view, the groove width center line in the narrowed portion of the groove portion is smaller in inclination angle than the respective groove width center lines in the end portion and the central portion in the tire circumferential direction, and the narrowed portion is The pair of side wall surfaces that are defined are configured to come into contact with each other when the land portion is elastically deformed. Therefore, when the land portion is elastically deformed, for example, during cornering traveling, the pair of side surfaces are formed. When the wall surfaces come into contact with each other, further deformation of the land portion can be restricted, and the cornering force of the tire can be further ensured.

  Further, a plurality of attachment bodies that are attached to the axle, a ring-like body that surrounds the attachment bodies from the outer side in the tire radial direction, and a plurality of pieces disposed along the tire circumferential direction between the attachment body and the ring-like body. And a connecting member for relatively elastically displacing the attachment body and the ring-shaped body, and an outer peripheral surface side of the ring-shaped body that is disposed over the entire circumference, and the tread tread portion is disposed on the outer peripheral surface. And a tread member provided.

  In this case, the connecting member connects the attachment body and the ring-shaped body so as to be relatively elastically displaceable, and the tread member is disposed on the outer peripheral surface side of the ring-shaped body. The deformation of the tread member can be suppressed because it deforms while being displaced following the relative elastic displacement of the ring-shaped body. Thereby, it becomes possible to make it easy to maintain the shape of the groove portion, and it is possible to reliably improve drainage.

  In addition, a visible body whose surface is exposed to the outside is disposed on the wall surface that defines the groove, and the surface of the visible body may have a higher reflection luminance than the tread surface portion.

  In this case, since the surface of the object to be visually recognized has higher reflection luminance than the tread surface portion, visibility from the surroundings can be improved. This makes it possible to easily recognize the presence of a vehicle equipped with the tire from the surroundings, for example, effectively preventing contact between the vehicle and surrounding pedestrians or other vehicles. It is possible to make it easy to ensure safe safety.

  According to the non-pneumatic tire according to the present invention, drainage can be improved.

In one Embodiment which concerns on this invention, it is the schematic perspective view which decomposed | disassembled some non-pneumatic tires. It is the tire side view which looked at the non-pneumatic tire shown in FIG. 1 from the one side of the tire width direction. FIG. 3 is a plan view of the first divided case body of the non-pneumatic tire shown in FIG. 1 viewed from one side in the tire width direction, or a plan view of the second divided case body viewed from the other side in the tire width direction. It is an enlarged view which shows the principal part of FIG. It is a tire top view of the tread member which constitutes the non-pneumatic tire shown in FIG.

Hereinafter, an embodiment of a non-pneumatic tire according to the present invention will be described with reference to FIGS. 1 to 4. The non-pneumatic tire (tire) 1 may be employed in a small vehicle that travels at a low speed, such as a handle-type electric wheelchair defined in JIS T 9208, for example.
The non-pneumatic tire 1 includes a mounting body 11 attached to an axle (not shown), a ring-shaped body 13 surrounding the mounting body 11 from the outside in the tire radial direction, and a tire between the mounting body 11 and the ring-shaped body 13. A plurality of members are arranged along the circumferential direction, and a connecting member 15 that connects the attachment body 11 and the ring-shaped body 13 so as to be relatively elastically displaceable. And a tread member 16 disposed over the entire surface.

  Here, the attachment body 11, the ring-shaped body 13, and the tread member 16 are each arranged coaxially with the common shaft. Hereinafter, the common axis is referred to as an axis O, a direction along the axis O is referred to as a tire width direction H, a direction orthogonal to the axis O is referred to as a tire radial direction, and a direction around the axis O is a tire circumference. It is called direction. In addition, the attachment body 11, the ring-shaped body 13, and the tread member 16 are disposed such that the center portions in the tire width direction H are aligned with each other.

As shown in FIGS. 1 and 2, the attachment body 11 includes a mounting cylinder portion 17 to which the front end portion of the axle is mounted, an outer ring portion 18 that surrounds the mounting cylinder portion 17 from the outside in the tire radial direction, And a plurality of ribs 19 that connect the mounting cylinder portion 17 and the outer ring portion 18.
The mounting cylinder portion 17, the outer ring portion 18, and the rib 19 are integrally formed of a metal material such as an aluminum alloy. The mounting cylinder portion 17 and the outer ring portion 18 are each formed in a cylindrical shape and arranged coaxially with the axis O. The plurality of ribs 19 are arranged point-symmetrically with respect to the axis O.

A plurality of key groove portions 18a that are recessed toward the inside in the tire radial direction and that extend in the tire width direction H are formed on the outer peripheral surface of the outer ring portion 18 at intervals in the tire circumferential direction. The key groove portion 18a is opened only on one side of both ends in the tire width direction H on the outer peripheral surface of the outer ring portion 18, and the other side is closed.
In the outer ring portion 18, a plurality of hollow holes penetrating in the tire radial direction are arranged at intervals in the tire width direction H in a portion located between the key groove portions 18 a adjacent in the tire circumferential direction. A plurality of hole rows 18c are formed at intervals in the tire circumferential direction. The rib 19 is also formed with a hole 19a penetrating in the tire width direction H.

  In addition, a concave portion 18b that is recessed toward the other side in the tire width direction H and into which the plate material 28 is fitted is formed at the edge corresponding to the key groove portion 18a at one end edge in the tire width direction H of the outer ring portion 18. Has been. A through hole is formed in the plate member 28, and a female screw communicating with the through hole of the plate member 28 fitted in the recess 18b on a wall surface facing the one side in the tire width direction H among the wall surfaces defining the recess 18b. The part is formed. A plurality of these internal thread portions and through holes are formed at intervals in the tire circumferential direction.

  A cylindrical exterior body 12 is externally fitted to the attachment body 11. On the inner peripheral surface of the exterior body 12, a plurality of protrusions 12a that protrude toward the inner side in the tire radial direction and extend over the entire length in the tire width direction H are disposed at intervals in the tire circumferential direction. These protrusions 12 a are fitted into the key groove portions 18 a of the attachment body 11. The exterior body 12 is fixed to the attachment body 11 by screwing a bolt into the female thread portion through the through hole of the plate member 28 fitted in the recess 18b in a state where the protrusion 12a is fitted in the key groove portion 18a. ing. In this state, the protruding portion 12a is formed in the tire width direction H by the plate member 28 and the other wall surface facing the one side located at the other end in the tire width direction H among the wall surfaces defining the recess 18b. It is sandwiched.

Of the wall surfaces defining the key groove portion 18a, the pair of side wall surfaces and the bottom wall surface facing each other in the tire circumferential direction form a right angle. Moreover, a pair of side wall surfaces which stand up from the inner peripheral surface of the exterior body 12 and the top wall surface which faces the inner side in the tire radial direction out of the outer surface of the protruding portion 12a form a right angle. Furthermore, the size of the protrusion 12a and the key groove 18a in the tire circumferential direction is equal to each other.
Further, the ring-shaped body 13 is larger in size in the tire width direction H than the exterior body 12, that is, the width is larger. In the example shown in the figure, the ring-shaped body 13 is formed in a cylindrical shape.

The connecting member 15 connects the outer peripheral surface side of the attachment body 11 and the inner peripheral surface side of the ring-shaped body 13. In the illustrated example, the connecting member 15 is connected to the outer peripheral surface of the exterior body 12 and the ring-shaped body 13. The 1st elastic connection board 21 and the 2nd elastic connection board 22 which mutually connect with the inner peripheral surface are provided.
The connecting member 15 includes a plurality of first elastic connecting plates 21 arranged along the tire circumferential direction at a position in one tire width direction H, and the second elastic connecting plate 22 is a position in the one tire width direction H. A plurality (60 in the illustrated example) are provided along the tire circumferential direction so that a plurality of different tire width directions H are arranged along the tire circumferential direction.
That is, the plurality of first elastic connecting plates 21 are arranged at the same position in the tire width direction H along the tire circumferential direction, and the plurality of second elastic connecting plates 22 are separated from the first elastic connecting plate 21. A plurality of tires are arranged along the tire circumferential direction at the same position in the tire width direction H that is separated in the tire width direction H.

Note that the plurality of connecting members 15 are separately disposed between the exterior body 12 and the ring-shaped body 13 at positions that are point-symmetric with respect to the axis O. All the connecting members 15 have the same shape and size. Further, the width of the connecting member 15 is smaller than the width of the ring-shaped body 13.
The first elastic coupling plates 21 adjacent in the tire circumferential direction are not in contact with each other, and the second elastic coupling plates 22 adjacent in the tire circumferential direction are also in non-contact with each other. Further, the first elastic connecting plate 21 and the second elastic connecting plate 22 adjacent in the tire width direction H are also not in contact with each other.
In addition, the width | variety of each of the 1st elastic connection board 21 and the 2nd elastic connection board 22 is mutually equal. The thicknesses of the first elastic connecting plate 21 and the second elastic connecting plate 22 are also equal to each other.

Here, in the first elastic connecting plate 21, one end 21a connected to the ring-shaped body 13 is located on one side in the tire circumferential direction with respect to the other end 21b connected to the exterior body 12, and the second Of the elastic connecting plate 22, one end 22 a connected to the ring-shaped body 13 is located on the other side in the tire circumferential direction with respect to the other end 22 b connected to the exterior body 12.
Further, the one end portions 21 a and 22 a of the first elastic connecting plate 21 and the second elastic connecting plate 22 in one connecting member 15 are made to have different positions in the tire width direction H on the inner peripheral surface of the ring-shaped body 13. And are connected to the same position in the tire circumferential direction.

  In the illustrated example, in each of the first elastic connecting plate 21 and the second elastic connecting plate 22, intermediate portions 21c and 22c positioned between the one end portions 21a and 22a and the other end portions 21b and 22b are arranged in the tire circumferential direction. A plurality of curved portions 21d to 21f and 22d to 22f that are curved are formed along the direction in which the connecting plates 21 and 22 extend in a side view of the tire 1 when the tire 1 is viewed from the tire width direction H. In each of the connecting plates 21 and 22, among the plurality of bending portions 21d to 21f and 22d to 22f, the bending directions of the bending portions 21d to 21f and 22d to 22f adjacent to each other in the extending direction are opposite to each other. It has become.

The plurality of curved portions 21d to 21f formed on the first elastic connecting plate 21 are a first curved portion 21d curved so as to project toward the other side in the tire circumferential direction, a first curved portion 21d, and one end portion. 21a and a second curved portion 21e curved so as to project toward one side in the tire circumferential direction, and located between the first curved portion 21d and the other end 21b and the tire circumference And a third bending portion 21f that is curved so as to project toward one side of the direction.
The plurality of curved portions 22d to 22f formed on the second elastic connecting plate 22 are a first curved portion 22d curved so as to project toward one side in the tire circumferential direction, a first curved portion 22d, and one end portion. 22a and the second curved portion 22e curved so as to protrude toward the other side in the tire circumferential direction, and located between the first curved portion 22d and the other end 22b and the tire circumference And a third curved portion 22f curved so as to project toward the other side of the direction.
In the illustrated example, the first bending portions 21d and 22d have a larger radius of curvature in the tire side view than the second bending portions 21e and 22e and the third bending portions 21f and 22f. The first curved portions 21d and 22d are disposed at the center of the first elastic connecting plate 21 and the second elastic connecting plate 22 in the extending direction.

  Further, the lengths of the two elastic connecting plates 21 and 22 are equal to each other, and the other end portions 21b and 22b of the two elastic connecting plates 21 and 22 are, as shown in FIG. Thus, the same angle (for example, 20 ° or more and 135 °) on one side and the other side in the tire circumferential direction centering on the axis O from the position facing the one end portions 21a, 22a in the tire radial direction on the outer peripheral surface of the exterior body 12. It is connected to each position separated by degrees. Further, the first bending portions 21d and 22d, the second bending portions 21e and 22e, and the third bending portions 21f and 22f of the first elastic connecting plate 21 and the second elastic connecting plate 22 are mutually in the tire circumferential direction. The opposite direction is the same and the size is the same.

Thereby, the shape of each connecting member 15 in the side view of the tire extends along the tire radial direction and passes through the one end portions 21a and 22a of both connecting plates 21 and 22, as shown in FIG. The line is symmetrical with respect to the virtual line L.
Further, in each of the elastic connecting plates 21 and 22, the one end side portion extending from the central portion in the extending direction to the one end portions 21a and 22a is more than the other end side portion extending from the central portion to the other end portions 21b and 22b. The thickness is increased. Thereby, while suppressing the increase in the weight of the connecting member 15 and ensuring the flexibility of the connecting member 15, the strength of the one end side portion where a large load is easily applied to the first and second elastic connecting plates 21 and 22 is increased. Can be increased. In addition, these one end side parts and other end side parts are smoothly connected without a level | step difference.

Here, in the present embodiment, the exterior body 12, the ring-shaped body 13, and the plurality of connecting members 15 are integrally formed.
Furthermore, in the present embodiment, the exterior body 12 is divided into a one-side divided exterior body 25 located on one side in the tire width direction H and a second-side divided exterior body 26 located on the other side in the tire width direction H. ing. Further, as shown in FIG. 1, the ring-shaped body 13 includes a one-side divided ring-shaped body 23 located on one side in the tire width direction H and a second-side divided ring shape located on the other side in the tire width direction H. The body 24 is divided. In the illustrated example, the exterior body 12 and the ring-shaped body 13 are each divided at the center in the tire width direction H.

The one-side split exterior body 25 and the one-side split ring-shaped body 23 are formed integrally with the first elastic connecting plate 21, and the other-side split exterior body 26 and the other-side split ring-shaped body 24 are second elastically connected. It is formed integrally with the plate 22.
Furthermore, in this embodiment, the one side division | segmentation exterior body 25, the one side division | segmentation ring-shaped body 23, and the 1st elastic connection board 21, and the other side division | segmentation exterior body 26, the other side division | segmentation ring-shaped body 24, and the 2nd elastic connection board 22 are carried out. Are integrally formed by casting or injection molding.
Hereinafter, the one-side divided outer body 25, the one-side divided ring-shaped body 23, and the first elastic connecting plate 21 are integrally formed as a first divided case body 31, the other-side divided outer body 26, and the other-side divided body. A structure in which the ring-shaped body 24 and the second elastic connecting plate 22 are integrally formed is referred to as a second divided case body 32.

Here, the injection molding may be a general method in which the entire first and second divided case bodies 31 and 32 are simultaneously molded separately, or the first and second divided case bodies 31 and 32. In each, the one side and the other side split outer casings 25 and 26, the one side and the other side split ring bodies 23 and 24, and a part of the first and second elastic connecting plates 21 and 22 remain as inserts. Insert molding for injection molding may be used, or so-called two-color molding or the like may be used.
Further, in each of the first and second divided case bodies 31 and 32, the one side and the other side divided exterior bodies 25 and 26, the one side and the other side divided ring bodies 23 and 24, and the first and second elastic couplings. The plates 21 and 22 may be formed of different materials or the same material. Examples of this material include a metal material and a resin material, but a resin material, particularly a thermoplastic resin is preferable from the viewpoint of weight reduction.
When the entire first and second divided case bodies 31 and 32 are simultaneously injection-molded separately, a plurality of protrusions 12a formed on the exterior body 12 may be used as gate portions.

  In each of the first and second divided case bodies 31 and 32, the center portion of the first and second elastic connecting plates 21 and 22 in the tire width direction H, the center portion of the ring-shaped body 13 in the tire width direction H, and the exterior The center portion of the body 12 in the tire width direction H coincides with each other, the exterior body 12 has a width smaller than that of the ring-shaped body 13, and the widths of the first elastic connection plate 21 and the second elastic connection plate 22. It is equivalent.

And the edge of the tire width direction H of each of the one-side divided ring-shaped body 23 and the other-side divided ring-shaped body 24 is connected by, for example, welding, fusion, or adhesion. Of these, in the case of welding, for example, hot plate welding or the like may be employed.
Further, the edges in the tire width direction H of the one-side divided outer package 25 and the other-side divided outer package 26 are separated from each other in the tire width direction H. Thereby, it is prevented that a burr | flash arises in the internal peripheral surface of the exterior body 12 externally fitted by the attachment body 11. FIG.

Further, the first divided case body 31 and the second divided case body 32 have the same shape and the same size as shown in FIG. 3 in a state before the connection of the 31, 32 as described above.
And when connecting as described above, each connecting member 15 in the tire circumferential direction of each of the first divided case body 31 and the second divided case body 32 is line-symmetric as described above in the tire side view. While aligning the positions of the ring-shaped bodies 13 of the first divided case body 31 and the second divided case body 32, the two divided case bodies 31, 32 are oriented in the tire width direction H opposite to each other. The ends in the tire width direction H are butted together and connected.

  The tread member 16 is formed in a cylindrical shape, and integrally covers the outer peripheral surface side of the ring-shaped body 13 over the entire region. In the illustrated example, the inner peripheral surface of the tread member 16 extends over the entire region and the outer peripheral surface of the ring-shaped body 13. Close to. The tread member 16 is made of, for example, vulcanized rubber obtained by vulcanizing natural rubber and / or a rubber composition, or a thermoplastic material. Examples of the thermoplastic material include a thermoplastic elastomer or a thermoplastic resin. Examples of the thermoplastic elastomer include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), styrene-based thermoplastic elastomer (TPS), and urethane as defined in JIS K6418. Examples thereof include a thermoplastic elastomer (TPU), a crosslinked thermoplastic rubber (TPV), and other thermoplastic elastomers (TPZ). Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, and polyamide resin. From the viewpoint of wear resistance, it is preferable to form the tread member 16 from vulcanized rubber.

Further, in the tread tread surface portion 16a provided on the outer peripheral surface of the tread member 16, groove portions 41 that are individually opened are disposed at both ends in the tire width direction H of the tread tread surface portion 16a. In the illustrated example, the entire outer peripheral surface of the tread member 16 is a tread tread surface portion 16a, and a plurality of groove portions 41 are arranged on the tread tread surface portion 16a at intervals in the tire circumferential direction.
In the present embodiment, as shown in FIG. 5, the groove portion 41 extends from one side of the tire circumferential direction toward the other side while reaching the both ends in the tire width direction H of the tread surface 16 a. Yes. In the illustrated example, the groove 41 extends from the other side in the tire width direction H toward one side while extending from one side in the tire circumferential direction toward the other side.

  Furthermore, in the present embodiment, the groove portion 41 is provided with a narrowed portion 41a that is narrower than the other portions in the groove portion 41. The narrowed portion 41a includes, in the groove portion 41, both end portions 41b in the tire circumferential direction located at both ends in the tire width direction H of the tread tread surface portion 16a, and a central portion 41c in the tire circumferential direction located on the tire equator portion CL. A pair is arranged so as to be positioned between the two. A central portion 41 c in the tire circumferential direction of the groove portion 41 crosses the tire equator portion CL in the tire width direction H. Further, both end portions 41b in the tire circumferential direction of the groove portion 41 are arranged so as to sandwich the central portion 41c in the tire circumferential direction in the tire width direction H, and the groove width of these both end portions 41b and the groove width of the central portion 41c. Are equivalent to each other. The pair of narrowed portions 41a are arranged so as to sandwich the tire equator portion CL in the tire width direction H.

In the example shown here, the narrowed portion 41a is separately provided at the end portion 41b and the central portion 41c in the tire circumferential direction of the groove portion 41 via a pair of connecting portions 41d and 41e that sandwich the narrowed portion 41a in the tire circumferential direction. It is connected.
Of the pair of connection portions 41d and 41e, the first connection portion 41d that connects the end portion 41b in the tire circumferential direction of the groove portion 41 and the narrowed portion 41a is gradually narrowed from the end portion 41b toward the narrowed portion 41a. It has become. Here, of the wall surfaces defining the first connection portion 41d, the pair of side wall surfaces extending from the bottom wall surface facing the outer side in the tire radial direction toward the outer side in the tire radial direction are the outer sides in the tire width direction H. Or facing inward. Of the pair of side wall surfaces, the side wall surface facing the outside in the tire width direction H protrudes toward the outside in the tire width direction H, so that the first connection portion 41d is narrowed from the end portion 41b. The width gradually decreases toward the portion 41a.

  In the illustrated example, the pair of side wall surfaces that define the first connecting portion 41d are stepped on the pair of side wall surfaces that define the end portion 41b and the pair of side wall surfaces that define the narrowed portion 41a. It is connected smoothly. Of the pair of side wall surfaces defining the first connection portion 41d, the side wall surface facing the outside in the tire width direction H and the pair of side wall surfaces defining the end portion 41b in the tire width direction H. The side wall surface facing outward is connected to form a curved shape that protrudes toward the inner side in the tire width direction H in a plan view of the tire when the non-pneumatic tire 1 is viewed from the outer side in the tire radial direction. Yes.

  Of the pair of connection portions 41d and 41e, the second connection portion 41e that connects the central portion 41c in the tire circumferential direction of the groove portion 41 and the narrowed portion 41a gradually increases from the central portion 41c toward the narrowed portion 41a. It is narrow. Here, the pair of side wall surfaces that define the second connection portion 41e face the outer side or the inner side in the tire width direction H. In the present embodiment, of the pair of side wall surfaces in the tire width direction H. The side wall surface facing inwardly protrudes toward the inner side in the tire width direction H, whereby the second connecting portion 41e gradually becomes narrower from the central portion 41c toward the narrowed portion 41a.

  In the illustrated example, the pair of side wall surfaces that define the second connecting portion 41e are stepped on the pair of side wall surfaces that define the central portion 41c and the pair of side wall surfaces that define the narrowed portion 41a. It is connected smoothly. Of the pair of side wall surfaces defining the second connection portion 41e, the side wall surface facing the inside in the tire width direction H and the pair of side wall surfaces defining the center portion 41c are in the tire width direction H. The side wall surface facing inward is connected so as to form a curved shape that protrudes outward in the tire width direction H in the tire plan view.

Here, in the present embodiment, the groove 41 is point-symmetric with respect to the symmetry center C on the tire equator CL in the tire plan view.
In the tire plan view, in the groove portion 41, the groove width center line La in the narrowed portion 41a is closer to the tire circumferential direction than the groove width center lines Lb and Lc in the end portion 41b and the central portion 41c in the tire circumferential direction. The inclination angle θ formed with respect to the reference line Ls extending along the axis is small. Further, in the illustrated example, the groove width center line Lb of the end portion 41b in the tire circumferential direction of the groove portion 41 has a larger inclination angle θ than the groove width center line Lc of the central portion 41c in the tire circumferential direction. Yes.

The plurality of groove portions 41 configured as described above are formed in the same shape and size, and the groove portions 41 adjacent to each other in the tire circumferential direction are not open to each other.
And the center part 41c of the tire circumferential direction in the groove part 41 is on the other side of the tire circumferential direction with respect to the groove part 41 and the narrowed part 41a in the groove part 41 located on one side of the tire circumferential direction with respect to the groove part 41. A plurality of groove portions 41 are arranged on the tread tread surface portion 16a so as to be sandwiched in the tire width direction H by the narrow portion 41a in the groove portion 41 located.

The tread surface 16a is provided with a land portion 42 defined by a groove portion 41. In the illustrated example, the land portion 42 is defined between the groove portions 41 adjacent to each other in the tire circumferential direction. A plurality are arranged in the circumferential direction. The land portions 42 extend from one side in the tire circumferential direction toward the other side, respectively, and reach the both ends in the tire width direction H of the tread tread surface portion 16a. The tire extends from the other side in the tire width direction H toward the one side while extending from the side toward the other side.
The land portion 42 includes a pair of circumferential end small land portions 42a disposed between both ends 41b in the tire circumferential direction among the groove portions 41 adjacent to each other in the tire circumferential direction, and a central portion in the tire circumferential direction. The central small land portion 42b disposed between 41c and the pair of peripheral end small land portions 42a and the central small land portion 42b are connected to each other, and the peripheral end small land portion 42a and the central small land portion 42b are connected to each other. A narrower pair of connecting small land portions 42c are integrally connected.

Here, the pair of side wall surfaces that define the narrowed portion 41a of the groove portion 41 are configured to contact each other when the land portion 42 partitioned by the groove portion 41 into the tread tread surface portion 16a is elastically deformed. Yes. Further, in the present embodiment, the pair of side wall surfaces that define the narrowed portion 41a are configured to approach or abut each other when the non-pneumatic tire 1 is grounded on a flat road surface under normal conditions. . Here, the normal condition means that the load is equal to that of the vehicle to which the non-pneumatic tire 1 is applied, and the flat road surface means an ideal smooth road surface.
In the illustrated example, of the pair of narrowed portions 31a of the groove portion 41, the narrowed portion 41a located on one side in the tire circumferential direction is between the land portions 42 adjacent to each other in the tire circumferential direction with the groove portion 41 interposed therebetween. Among these, it is located between the central small land portion 42b in the land portion 42 located on one side in the tire circumferential direction and the peripheral end small land portion 42a in the land portion 42 located on the other side in the tire circumferential direction. . Further, of the pair of narrowed portions 41a, the narrowed portion 41a located on the other side in the tire circumferential direction has a tire circumferential direction among the land portions 42 adjacent to each other in the tire circumferential direction with the groove 41 interposed therebetween. It is located between the peripheral end small land portion 42a in the land portion 42 located on one side and the central small land portion 42b in the land portion 42 located on the other side in the tire circumferential direction.

Moreover, in this embodiment, the to-be-viewed body 43 with the surface exposed to the outside is disposed on the tread tread portion 16a. The visible body 43 is disposed on the tire equator portion CL over the entire length in the tire circumferential direction. In the illustrated example, a plurality of the visible bodies 43 are arranged on the tread tread surface portion 16a in the tire circumferential direction, and among the visible bodies 43 adjacent to each other in the tire circumferential direction, circumferential end portions in the tire circumferential direction are adjacent to each other. The objects to be visually recognized 43 are continuously arranged over the entire length in the tire circumferential direction by being shifted in the tire width direction H and overlapping each other in the tire circumferential direction.
The visible body 43 extends in the tire circumferential direction so as to be inclined with respect to the tire equator CL in the tire plan view, and the length L along the tire circumferential direction of the visible body 43 is, for example, It may be about 35% or less of the total length of the tread tread surface portion 16a along the tire circumferential direction.

The visible body 43 is disposed on the wall surface that defines the groove 41. The visible body 43 is disposed on the bottom wall surface facing the outer side in the tire radial direction among the wall surfaces defining the groove portion 41, and the surface of the visible body 43 faces the outer side in the tire radial direction. In the example shown in the figure, the visible body 43 is disposed on the bottom wall surface of the central portion 41c and the second connecting portion 41e of the groove portion 41, and the outer peripheral edge of the visible body 43 is the groove portion in the tire plan view. 41 extends along the outer peripheral edge of the bottom wall surface of the central portion 41c and the second connecting portion 41e.
The visible body 43 is disposed in an arrangement recess 44 that is formed on the bottom wall surface and opens toward the outer side in the tire radial direction (opening direction of the arrangement recess). The back surface opposite to the front surface is formed in a sheet shape that is fixed to the bottom surface (not shown) that faces the outer side in the tire radial direction among the wall surfaces that define the arrangement recess 44. And the to-be-viewed body 43 is formed in the same shape and size as the arrangement | positioning recessed part 44 in the said tire planar view (front view seen from the opening direction), and the outer periphery of the to-be-viewed body 43 and the inner periphery of the arrangement | positioning recessed part 44 Are in contact with each other over the entire circumference.

The visible body 43 is fixed to the bottom surface of the placement recess 44 by, for example, adhesion, and the surface of the visible body 43 is flush with the bottom wall surface of the groove 41. The adhesion may be, for example, vulcanization adhesion or adhesion with an adhesive, and this adhesion may be performed at the time of vulcanization molding of the tread member 16, and the tread member 16 and the object to be viewed 43 are connected. You may carry out after forming separately.
And the surface of the to-be-viewed body 43 has higher reflection luminance than the tread surface portion 16a.

As described above, according to the non-pneumatic tire 1 according to the present embodiment, the groove portion 41 extends in the tire width direction H of the tread tread surface portion 16a while extending from one side in the tire circumferential direction toward the other side. Since both ends reach each other, it is possible to make the water in the groove portion 41 flow smoothly and easily drain to the outside in the tire width direction H when the non-pneumatic tire 1 travels, and improve drainage. be able to.
Further, since the narrowed portion 41a is provided in the groove portion 41, it is possible to reduce the occupied area of the groove portion 41 in the tread tread surface portion 16a, and the land portion 42 partitioned by the groove portion 41 into the tread tread surface portion 16a. It is possible to secure the size of the land portion 42 with high rigidity, and to easily ensure the cornering force of the non-pneumatic tire 1.
As mentioned above, according to the said non-pneumatic tire 1, drainage can be improved, ensuring a cornering force.

  In addition, since the pair of narrowed portions 41a are disposed so as to be positioned between both end portions 41b and the central portion 41c in the tire circumferential direction, the tire width direction between the pair of narrowed portions 41a. It is possible to secure long distances in the tire circumferential direction and the tire circumferential direction, and to easily increase the rigidity of the land portion 42 at each portion separated in the tread tread surface portion 16a, and to improve the cornering force of the non-pneumatic tire 1 It can be made easier to secure.

  Further, in the tire plan view, in the groove portion 41, the groove width center line La in the narrowed portion 41a is more inclined than the groove width center lines Lb and Lc in the end portion 41b and the center portion 41c in the tire circumferential direction. Since the pair of side wall surfaces defining θ and the narrowed portion 41a are configured to contact each other when the land portion 42 is elastically deformed, the non-pneumatic tire 1 is subjected to cornering traveling, for example. When the land portion 42 is elastically deformed, the pair of side wall surfaces come into contact with each other so that further deformation of the land portion 42 can be restricted, and the cornering force of the non-pneumatic tire 1 can be further increased. It can be easily secured.

  The connecting member 15 connects the attachment body 11 and the ring-shaped body 13 so as to be relatively elastically displaceable, and the tread member 16 is disposed on the outer peripheral surface side of the ring-shaped body 13. Since 16 is deformed while displacing following the relative elastic displacement between the attachment body 11 and the ring-shaped body 13, the amount of deformation of the tread member 16 can be suppressed. Thereby, it becomes possible to make it easy to maintain the shape of the groove part 41, and to improve drainage reliably.

Moreover, since the reflective luminance is higher than the tread tread surface portion 16a on the surface of the visually recognizable body 43, visibility from the surroundings can be improved. As a result, it becomes possible to easily recognize the presence of the vehicle on which the non-pneumatic tire 1 is mounted from the surroundings, for example, effectively preventing contact between the vehicle and the surrounding pedestrians or other vehicles. Therefore, it is possible to easily ensure good safety.
Further, since the tread member 16 is disposed on the outer peripheral surface side of the ring-shaped body 13 over the entire circumference thereof, it is possible to easily secure the surface area of the body 43 to be viewed disposed on the tread tread surface portion 16a. Thus, the visibility can be easily improved.
Furthermore, as described above, since the deformation amount of the tread member 16 is suppressed, it is possible to make it difficult to separate the visually-recognized body 43 from the tread tread surface portion 16a, and the visibility can be improved with certainty.

  Moreover, in this embodiment, since the inner peripheral surface of the tread member 16 is in close contact with the outer peripheral surface of the ring-shaped body 13 over the entire area, the tread member 16 is supported by the ring-shaped body 13 from the inner side in the tire radial direction. Thus, it becomes possible to suppress the tread member 16 from being bent and deformed in the tire width direction H during traveling, and it is possible to make it difficult to separate the visible body 43 from the tread tread surface portion 16a.

In addition, when the length L along the tire circumferential direction of the visible body 43 is about 35% or less of the total length along the tire circumferential direction of the tread tread surface portion 16a, the visible body 43 is It is possible to suppress bending and deformation in the tire circumferential direction, and it is possible to make it difficult to separate the visible body 43 from the tread surface portion 16a. In addition, when the length L along the tire circumferential direction of the visible body 43 is greater than about 35% of the total length along the tire circumferential direction of the tread tread surface portion 16a, the visible body 43 extends in the tire circumferential direction. There is a possibility that it is difficult to suppress the bending deformation.
Further, when the non-pneumatic tire 1 is mounted on a low-weight vehicle such as the small vehicle and travels at a low speed, the tread member 16 is not easily deformed and deformed during travel. 43 can be made more difficult to detach from the tread surface 16a.

  Further, since the visible body 43 is disposed on the wall surface that defines the groove portion 41, it is possible to make it difficult to bring the visible body 43 into contact with the road surface during traveling. It can be made more difficult to separate from the surface portion 16a.

Furthermore, since the visible body 43 is disposed on the bottom wall surface, the visible body 43 can be easily seen from the traveling direction of the non-pneumatic tire 1 and visibility from the surroundings can be improved. It can certainly be improved.
Here, since the bottom wall surface is less likely to be distorted and deformed during traveling as compared with the side wall surface of the groove portion 41, the object to be viewed 43 is disposed on the bottom wall surface as described above, so that the object to be viewed is provided. 43 can be made more difficult to detach from the tread surface 16a.

In addition, since the visible body 43 is arranged in the arrangement recess 44, it is possible to suppress the volume of the groove 41 from being reduced due to the arrangement of the visible body 43. The drainage property of the non-pneumatic tire 1 can be easily ensured.
Furthermore, since the visible body 43 is formed in the same shape and size as the arrangement recess 44, for example, when the water flows in the groove 41, the visible body 43 receives water pressure from the outer peripheral edge thereof. It is possible to make it easier to suppress the movement of the object to be visually recognized 43, and it is possible to make it difficult to separate the visible body 43 from the tread surface 16a.

In addition, among the visible bodies 43 adjacent to each other in the tire circumferential direction, the circumferential end portions in the tire circumferential direction are shifted from each other in the tire width direction H and overlap each other in the tire circumferential direction. It becomes possible to arrange | position the to-be-viewed body 43 continuously in a tire peripheral direction, and can improve visibility still more reliably.
In addition, since a plurality of the visible bodies 43 are disposed in the tire circumferential direction on the tread tread portion 16a, even if a part of the plurality of the visible bodies 43 is detached, other visible bodies 43 makes it easy to ensure visibility. For example, when one visible object is continuously arranged in the tire circumferential direction over the same range as the plurality of visible objects 43, for example. In comparison, visibility can be easily ensured.

  Moreover, in this embodiment, the 1st division | segmentation exterior body 25, the 1st division | segmentation ring-shaped body 23, and the 1st division | segmentation exterior body 26 and the other side division | segmentation exterior body 26 in which the 1st elastic connection board 21 was integrally formed. A split ring-shaped body 24 and a second split case body 32 in which the second elastic connecting plate 22 is integrally formed. Therefore, when assembling the non-pneumatic tire 1, both ends of each of the plurality of connecting members 15 are provided. Since the first and second divided case bodies 31 and 32 need only be attached to the mounting body 11 without connecting the parts 21a, 22a, 21b and 22b to the mounting body 11 and the ring-shaped body 13 separately, Time can be shortened.

Further, since the first and second divided case bodies 31 and 32 are provided, for example, the both end portions 21a, 22a, 21b, and 22b of the connecting member 15 and the attachment body 11 and the ring-shaped body 13 are connected to a fastening member or the like. The weight can be reduced as compared with the case of connecting using the.
Further, a plurality of first elastic connecting plates 21 are arranged along the tire circumferential direction at a position in one tire width direction H, and the second elastic connecting plates 22 are arranged around the tire circumference at other tire width direction H positions. Since a plurality are arranged along the direction, it is possible to prevent the adjacent connecting members 15 from interfering with each other in the tire circumferential direction, and it is possible to prevent the number of arrangement members from being limited.

  Further, in the first elastic connecting plate 21, one end 21 a connected to the ring-shaped body 13 is located on one side in the tire circumferential direction with respect to the other end 21 b connected to the exterior body 12, and second elastic Of the connecting plate 22, one end 22 a connected to the ring-shaped body 13 is located on the other side in the tire circumferential direction with respect to the other end 22 b connected to the exterior body 12. When an external force is applied to the first elastic connecting plate 21, the first elastic connecting plate 21 and the second elastic connecting plate 22 can be easily elastically deformed. Comfort can be ensured.

  Further, in each of the first divided case body 31 and the second divided case body 32, the tire among the first elastic connecting plate 21 and the second elastic connecting plate 22 is provided between the ring-shaped body 13 and the exterior body 12. In the side view, only one of a plurality extending in a certain direction is provided, and the other extending in the other direction is not provided, so that the exterior body 12, the ring-shaped body 13, and the connecting member 15 are formed. In this case, first, the exterior body 12, the ring-shaped body 13, and the connecting member 15 are integrally formed by forming the first and second divided case bodies 31 and 32 that are simple in structure and can be easily formed. This non-pneumatic tire 1 can be formed easily and reliably as compared with the case where the case body having a complicated structure is formed.

Moreover, since the 1st, 2nd division | segmentation case bodies 31 and 32 are each integrally formed by casting or injection molding, this non-pneumatic tire 1 can be formed still more easily.
In addition, as described above, in each of the divided case bodies 31 and 32, only one of the elastic connecting plates 21 and 22 is disposed between the ring-shaped body 13 and the exterior body 12. In addition, when the divided case bodies 31 and 32 are integrally formed by casting or injection molding, it becomes possible to easily make the molten metal or molten resin easily reach every corner of the mold, and the structure of the mold. It is also possible to suppress the complexity of the tire, and the non-pneumatic tire 1 can be formed more easily and reliably.

  Further, since the connecting member 15 is formed symmetrically with respect to the virtual line L in the tire side view, the spring constant along one side in the tire circumferential direction and the other side of the non-pneumatic tire 1 are along. It becomes possible to suppress the difference between the spring constant and good maneuverability.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the visible body 43 is disposed on the bottom wall surface of the central portion 41c and the second connection portion 41e of the groove portion 41, but is not limited thereto. You may arrange | position at the bottom wall surface etc. in the edge part 41b of a tire circumferential direction.
In the above-described embodiment, the visually-recognized body 43 is disposed on the bottom wall surface of the groove portion 41, but may be disposed on the side wall surface of the groove portion 41 instead.

  Moreover, in the said embodiment, although the to-be-viewed body 43 shall be formed in the sheet | seat shape of the same shape and the same size as the arrangement | positioning recessed part 44 in the said tire planar view, it is set as the other structure arrange | positioned in the arrangement | positioning recessed part 44. For example, the visually-recognized body 43 may be formed smaller than the arrangement recess 44 in the tire plan view, and may not be formed in a sheet shape. Moreover, the arrangement | positioning recessed part may be formed in the side wall surface of the groove part 41, Furthermore, the said arrangement | positioning recessed part 44 does not need, and the to-be-viewed body 43 is directly on the wall surface which defines the groove part 41, for example by adhesion | attachment etc. It may be fixed.

  Further, in the above embodiment, the visible body 43 is disposed on the wall surface that defines the groove portion 41, but is not limited thereto, and is disposed on the top surface of the land portion 42, for example. May be.

Moreover, in the said embodiment, among the to-be-viewed bodies 43 adjacent to the tire circumferential direction, the circumferential ends of the tire circumferential direction are shifted from each other in the tire width direction H and overlap each other in the tire circumferential direction. However, they do not have to overlap each other in the tire circumferential direction.
Furthermore, in the said embodiment, although the to-be-viewed body 43 shall be arrange | positioned in multiple numbers by the tire circumferential direction, one may be sufficient.
Furthermore, in the above-described embodiment, the visible body 43 is continuously disposed over the entire length in the tire circumferential direction, but is not limited thereto. For example, the visible body may be intermittently disposed on the tread tread surface portion over the entire length in the tire circumferential direction.
Further, the visible object 43 may not be provided.

  Moreover, in the said embodiment, the groove part 41 is extended toward the one side from the other side of the tire width direction H in which the key groove part 18a is closed, extending toward the other side from the one side of a tire circumferential direction. However, the present invention is not limited to this. For example, the groove portion extends from one side in the tire circumferential direction toward the other side while the key groove portion 18a opens from one side in the tire width direction H. It may extend toward the other side.

Moreover, in the said embodiment, although the narrow part 41a shall be connected to the edge part 41b and center part 41c of the tire circumferential direction via the connection parts 41d and 41e in the groove part 41, instead of this, for example, The narrow portion may directly connect the end portion and the center portion in the tire circumferential direction.
Furthermore, in the said embodiment, although a pair of side wall surface which defines the constriction part 41a shall be comprised so that it may contact | abut mutually when the land part 42 elastically deforms, it is not restricted to this.
Furthermore, in the embodiment, in the tire plan view, the groove width center line La in the narrowed portion 41a of the groove portion 41 is the groove width center lines Lb and Lc in the end portion 41b and the center portion 41c in the tire circumferential direction. However, the present invention is not limited to this. Further, the groove width center line of the narrowed portion may not extend with respect to the reference line, and may extend along the tire circumferential direction.

  Moreover, in the said embodiment, the narrow part 41a is arrange | positioned as a pair so that it may be located between the both ends 41b of a tire circumferential direction among the said groove parts 41, and the center part 41c of a tire circumferential direction. However, it is not limited to this. For example, the narrowed portion may constitute both end portions of the groove portion in the tire circumferential direction, and may be opened individually at both ends in the tire width direction H of the tread tread surface portion 16a. Further, for example, the stenosis part may not be a pair, but may be one or three or more.

Further, the bending direction of the bending portions 21d to 21f in the first elastic connecting plate 21 and the bending direction of the bending portions 22d to 22f in the second elastic connecting plate 22 are not limited to the above-described embodiment, and may be changed as appropriate.
Moreover, in the said embodiment, although the structure provided with the 1st elastic connection board 21 and the 2nd elastic connection board 22 each as the connection member 15 was shown, it replaced with this and the 1st connection member 15 is 1st. A configuration may be adopted in which a plurality of elastic connecting plates 21 and a plurality of second elastic connecting plates 22 are provided in different positions in the tire width direction H.
A plurality of connecting members 15 may be provided along the tire width direction H between the exterior body 12 and the ring-shaped body 13.

In addition, the other end portions 21b and 22b of the first elastic connecting plate 21 and the second elastic connecting plate 22 are, for example, sandwiching the axis O in the tire radial direction on the outer peripheral surface of the exterior body 12 instead of the embodiment. It may be connected to each position opposite to each other, or, on the outer peripheral surface of the exterior body 12, the one end portions 21 a and 22 a of the first elastic connecting plate 21 and the second elastic connecting plate 22 may be connected in the tire radial direction. You may connect with the position etc. which oppose by.
Further, instead of the above-described embodiment, the one end portions 21a and 22a of both the connecting plates 21 and 22 may be connected to the inner peripheral surface of the ring-shaped body 13 at different positions in the tire circumferential direction.

Furthermore, it is not necessary to provide a gap in the tire width direction H between the one-side divided outer package 25 and the other-side divided outer package 26.
Further, the exterior body 12 and the ring-shaped body 13 may be divided into three or more in the tire width direction H, or may not be divided.
Further, the first and second divided case bodies 31 and 32 are not limited to the above embodiment, and may be formed by, for example, cutting.

Moreover, in the said embodiment, although the exterior body 12, the ring-shaped body 13, and the some connection member 15 shall be integrally formed, it is not restricted to this, After forming each separately, mutually It may be connected. Furthermore, the exterior body 12 may be formed integrally with the attachment body 11.
In the above embodiment, the connecting member 15 connects the outer peripheral surface of the exterior body 12 and the inner peripheral surface of the ring-shaped body 13 to each other. You may change suitably to the other structure which connects a surrounding surface side. For example, in a configuration without the exterior body 12, the connecting member 15 may connect the outer peripheral surface of the attachment body 11 and the inner peripheral surface of the ring-shaped body 13 to each other.

  In the above embodiment, the present invention is applied to a so-called non-pneumatic tire. However, the present invention is not limited to this. For example, the present invention is applied to a so-called pneumatic tire that is suitably used for an automobile such as a road vehicle. May be. Even in this case, as in the above-described embodiment, when the tire is grounded on a flat road surface under normal conditions, the pair of side wall surfaces that define the narrowed portion are configured to be close to or in contact with each other. May be. Note that the normal conditions for a pneumatic tire are, when the tire is a so-called pneumatic tire, the load and the internal pressure, respectively, according to the industry standard for each region where the tire is produced or used (for example, “JATMA Year in Japan”). The maximum load of a single wheel (maximum load capacity) and the corresponding air pressure in the application size described in “Book”, “TRA Year Book” in the United States, “ETRTO Standard Manual” in Europe, etc.), and the rim, It means to make a standard rim (or “Approved Rim”, “Recommended Rim”) in the application size described in the industry standard. Further, the tread tread surface portion in the pneumatic tire refers to a contact surface of the tread portion with a specified internal pressure and a specified load specified in the industry standard.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

1 Non-pneumatic tire (tire)
DESCRIPTION OF SYMBOLS 11 Attachment body 13 Ring-shaped body 15 Connecting member 16 Tread member 16a Tread tread part 41 Groove part 41a Narrow part 41b End part 41c Center part 43 Subject to be seen CL Tire equatorial part H Tire width direction La, Lb, Lc Groove width center line Ls Reference line θ Inclination angle

Claims (4)

In the tread tread portion, a tire is provided with a plurality of groove portions that are individually opened at both ends in the tire width direction of the tread tread portion, with an interval in the tire circumferential direction,
While the plurality of groove portions extend from one side to the other side in the tire circumferential direction, and extend in the same direction along the tire width direction, the plurality of groove portions in the tire width direction of the tread tread surface portion. Itaru across each other Rutotomoni, partition the land portions between the grooves adjacent to each other in the tire circumferential direction,
The groove portion is provided with a narrowed portion narrower than other portions in the groove portion,
The narrowed portion is located between both ends in the tire circumferential direction located at both ends in the tire width direction of the tread tread surface portion and a central portion in the tire circumferential direction located on the tire equator portion of the groove portion. A pair is arranged so as to
The land portion extends continuously over the entire length of the tread tread surface portion in the tire width direction . In the tread surface portion, a tire is provided with groove portions that are individually opened at both ends in the tire width direction of the tread surface portion,
While the groove portion extends from one side of the tire circumferential direction toward the other side, it reaches each of both ends of the tread tread surface portion in the tire width direction,
The groove portion is provided with a narrowed portion narrower than other portions in the groove portion,
The narrowed portion is located between both ends in the tire circumferential direction located at both ends in the tire width direction of the tread tread surface portion and a central portion in the tire circumferential direction located on the tire equator portion of the groove portion. A pair is arranged so as to
In the tire plan view when the tire is viewed from the outside in the tire radial direction, the groove width center line in the narrowed portion of the groove portion is more tire than the groove width center lines in the end portion and the central portion in the tire circumferential direction. The inclination angle made with respect to the reference line extending along the circumferential direction is small,
Of the wall surfaces defining the constricted portion, a pair of side wall surfaces extending from the bottom wall surface facing the outer side in the tire radial direction toward the outer side in the tire radial direction is partitioned into the tread tread surface portion by the groove portion. A tire characterized by being configured to contact each other when the land portion is elastically deformed. The tire according to claim 1 or 2,
An attachment attached to the axle;
A ring-shaped body surrounding the mounting body from the outside in the tire radial direction;
A plurality of connection members disposed along the tire circumferential direction between the attachment body and the ring-shaped body, and a connection member that relatively elastically displaces the attachment body and the ring-shaped body;
And a tread member provided on the outer peripheral surface side of the ring-shaped body over the entire periphery thereof and provided with the tread tread surface portion on the outer peripheral surface. The tire according to any one of claims 1 to 3,
On the wall surface that defines the groove, a visible body whose surface is exposed to the outside is disposed,
The tire according to claim 1, wherein the surface of the object to be visually recognized has higher reflection luminance than the tread surface portion.

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