JP2018193046A - Non-pneumatic tire - Google Patents

Abstract

To provide a non-pneumatic tire capable of keeping an ultraviolet shielding effect.SOLUTION: There is provided a non-pneumatic tire 10 in which a skeleton member 1 is formed from a resin material, where an ultraviolet shielding layer 2 is provided on at least a part of the skeleton member 1, an apparent shear strength X of the ultraviolet shielding layer 2 is 2-42 MPa, and the apparent shear strength X of the ultraviolet shielding layer 2 and a thickness Y of the ultraviolet shielding layer 2 satisfy the following expression (1): Y≤-0.7624×X+48. In expression (1), X represents the apparent shear strength (MPa) of the ultraviolet shielding layer 2, and Y represents the thickness (μm) of the ultraviolet shielding layer 2.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a non-pneumatic tire.

In recent years, in order to avoid the occurrence of punctures, tires that do not need to be filled with pressurized air have been proposed.
For example, in Patent Document 1 below, a ring member including an attachment body attached to an axle, an inner cylinder body that is externally attached to the attachment body, and an outer cylinder body that surrounds the inner cylinder body from the outside in the tire radial direction; A plurality of members disposed along the tire circumferential direction between the inner cylinder body and the outer cylinder body, and a coupling member that relatively elastically displaces both the cylinder bodies. A pneumatic tire is disclosed. Patent Document 1 below discloses that a resin material is preferable as a material of the ring member and the connecting member from the viewpoint of weight reduction.

JP2013-86712A

For non-pneumatic tires in which the skeleton member of the tire such as the ring member and the connecting member is made of a resin material, an ultraviolet shielding paint is applied to the skeleton member in order to improve the weather resistance of the skeleton member made of the resin material. And drying to provide an ultraviolet shielding layer.
However, when an ultraviolet ray shielding layer is provided on a skeleton member made of a resin material, the ultraviolet ray shielding layer cannot withstand the input applied to the non-pneumatic tire, the ultraviolet ray shielding layer cracks, and the ultraviolet ray shielding effect is sufficiently obtained. Therefore, the weather resistance of the non-pneumatic tire could not be sufficiently improved.

  Therefore, the present invention solves the above-described problems and suppresses the occurrence of cracks in the ultraviolet shielding layer in a non-pneumatic tire in which the framework member is made of a resin material and the framework member is provided with an ultraviolet shielding layer. An object of the present invention is to provide a non-pneumatic tire capable of maintaining the ultraviolet shielding effect.

  The gist configuration of the present invention for solving the above problems is as follows.

The non-pneumatic tire of the present invention is a non-pneumatic tire whose skeleton member is made of a resin material,
At least a part of the skeleton member is provided with an ultraviolet shielding layer,
Only the ultraviolet shielding layer and the shear strength X is 2 to 42 MPa,
The non-ultraviolet shielding layer only shear strength X and the ultraviolet shielding layer thickness Y are expressed by the following formula (1):
Y ≦ −0.7624 × X + 48 (1)
[Wherein, X is an ultraviolet shielding layer only shear strength (MPa) and Y is a thickness (μm) of the ultraviolet shielding layer].
In the non-pneumatic tire of the present invention, generation of cracks in the ultraviolet shielding layer is suppressed, and the ultraviolet shielding effect can be maintained.
In the present invention, the shear strength X and the thickness Y of only the ultraviolet shielding layer are measured by the method described in Examples described later. In the present invention, the ultraviolet shielding layer means a layer having a function of shielding at least part of ultraviolet rays.

A non-pneumatic tire according to the present invention includes an attachment body attached to an axle, an inner cylinder that is externally attached to the attachment body, and a ring member that has an outer cylinder that surrounds the inner cylinder from the outside in the tire radial direction, A plurality of members arranged along the tire circumferential direction between the inner cylindrical body and the outer cylindrical body, and connecting members that connect the two cylindrical bodies;
It is preferable that the ultraviolet shielding layer is provided on at least a part of the ring member and the connecting member as the skeleton member. In this case, since the distortion due to input applied to the non-pneumatic tire is large, the effect of suppressing the occurrence of cracks in the ultraviolet shielding layer appears more remarkably.

  In the suitable example of the non-pneumatic tire of this invention, it has a primer layer between the said frame | skeleton member and the said ultraviolet-ray shielding layer. In this case, the ultraviolet shielding layer is difficult to peel off from the skeleton member, so that the ultraviolet shielding effect of the ultraviolet shielding layer can be maintained for a long time.

  In another preferred embodiment of the non-pneumatic tire of the present invention, the ultraviolet shielding layer contains at least one polymer selected from the group consisting of a fluorine-based polymer, an acrylic polymer, a silicon-based polymer, and a urethane-based polymer. In this case, the generation of cracks in the ultraviolet shielding layer is further suppressed, and the ultraviolet shielding effect can be maintained over a long period of time.

  Here, the primer layer preferably includes a polyolefin polymer modified with at least one selected from the group consisting of chlorine, acid, and amine. In this case, since the ultraviolet shielding layer is more difficult to peel from the skeleton member, the ultraviolet shielding effect of the ultraviolet shielding layer can be maintained for a longer period.

In the non-pneumatic tire of the present invention, the elastic modulus of the skeleton member is preferably 200 to 1500 MPa. In this case, the durability of the non-pneumatic tire is high, the ride comfort is good, and the effect of suppressing the occurrence of cracks in the ultraviolet shielding layer appears more remarkably.
In the present invention, the elastic modulus of the skeleton member is measured by the method described in Examples described later.

  In another preferred embodiment of the non-pneumatic tire of the present invention, the skeleton member is made of at least one resin material selected from the group consisting of polyamide resin, polyester resin, and polyolefin resin. In this case, the durability against strain input applied to the non-pneumatic tire is good, and the effect of suppressing the occurrence of cracks in the ultraviolet shielding layer appears more remarkably.

  According to the present invention, there is provided a non-pneumatic tire in which a skeleton member is made of a resin material, and the skeleton member is provided with an ultraviolet shielding layer that is difficult to crack, and can maintain an ultraviolet shielding effect. Can do.

It is explanatory drawing of the measuring method of not only an ultraviolet shielding layer but shear strength X. 1 is a schematic perspective view of a part of a non-pneumatic tire in an embodiment according to the present invention. It is the tire side view which looked at the non-pneumatic tire shown in FIG. 2 from the one side of the tire width direction. The top view which looked at the 1st division | segmentation case body by which the one side division | segmentation ring member and the 1st elastic connection board were integrally formed among the non-pneumatic tires shown in FIG. 2 from the one side of the tire width direction, or the other side It is the top view which looked at the 2nd division | segmentation case body in which the division | segmentation ring member and the 2nd elastic connection board were integrally formed from the other side of the tire width direction. It is an enlarged view which shows the principal part of FIG. It is a graph which shows the relationship between the deemed shear strength X and the thickness Y of the ultraviolet shielding layer of the non-pneumatic tire of an Example and a comparative example.

Below, the non-pneumatic tire of this invention is illustrated and demonstrated in detail based on the embodiment.
The non-pneumatic tire of the present invention is a non-pneumatic tire in which the skeleton member is made of a resin material, and an ultraviolet shielding layer is provided on at least a part of the skeleton member.
Here, the tire skeleton member is a member constituting the tire skeleton, more specifically, a member that supports the tread member from the inside of the tire to the outside in order to maintain the shape of the tire tread. Means. For example, it is a ring member (inner cylinder body, outer cylinder body), a connection member (spoke structure), etc. in a non-pneumatic tire.
Moreover, the non-pneumatic tire of this invention should just be provided with the ultraviolet shielding layer in at least one part of the frame member, and the ultraviolet shielding layer does not need to be provided in a part of the frame member. The ultraviolet shielding layer may be in direct contact with the skeleton member, but another layer, for example, a primer layer described later may be interposed between the ultraviolet shielding layer and the skeleton member.

In the non-pneumatic tire of the present invention, the only shearing strength X of the ultraviolet shielding layer is 2 to 42 MPa, and the shearing strength X of only the ultraviolet shielding layer is equal to the thickness Y of the ultraviolet shielding layer. The following formula (1):
Y ≦ −0.7624 × X + 48 (1)
[Wherein, X is an ultraviolet shielding layer only shear strength (MPa) and Y is a thickness (μm) of the ultraviolet shielding layer].

  As shown in Examples and Comparative Examples described later, the present inventor makes various kinds of ultraviolet shielding layers in which the deemed shear strength X and the thickness Y are changed, and generates cracks (durability) in the ultraviolet shielding layers. evaluated. As a result, only the ultraviolet shielding layer, the shear strength X is 2 to 42 MPa, and the ultraviolet shielding layer satisfying the formula (1) is provided on the skeleton member of the non-pneumatic tire, thereby causing the ultraviolet shielding layer to crack. It was found that it can be suppressed. Therefore, according to the present invention, it is assumed that the assumed shear strength X is 2 to 42 MPa, and the ultraviolet shielding layer satisfying the formula (1) is provided on the skeleton member of the non-pneumatic tire to maintain the ultraviolet shielding effect. The durability (weather resistance) of the non-pneumatic tire can be improved.

  Even if the formula (1) is satisfied, if only the ultraviolet shielding layer and the shear strength X is less than 2 MPa or more than 42 MPa, the occurrence of cracks in the ultraviolet shielding layer cannot be suppressed. Only the shielding layer and the shear strength X are set to 2 to 42 MPa. Here, the non-ultraviolet shielding layer-only shear strength X is preferably 3 MPa or more, and preferably 36 MPa or less, from the viewpoint of suppressing the occurrence of cracks in the ultraviolet shielding layer.

In the present invention, the non-ultraviolet shielding layer only shear strength X is measured using a coating strength tester “SAICS DN-GS type” manufactured by Daipura Wintes Co., Ltd., and more specifically, shown in FIG. as such, the ultraviolet shielding layer 2 provided on the frame member 1 when the cutting by the cutting edge 3, regards a value that measures the horizontal force F _H in accordance with the cutting edge 3, which corresponds to the inclination of the horizontal force F _H Shear strength X.
Here, the non-ultraviolet shielding layer shear strength X is an index of the hardness of the ultraviolet shielding layer 2. Therefore, the ultraviolet shielding layer 2 satisfying the formula (1) is soft and thin, can withstand input applied to the non-pneumatic tire, and can suppress the generation of cracks.

  The thickness Y of the ultraviolet shielding layer is not particularly limited, but is preferably 5 μm or more, more preferably 20 μm or more, and preferably 60 μm or less, more preferably 50 μm or less. When the thickness Y of the ultraviolet shielding layer is within this range, the ultraviolet rays can be sufficiently shielded and the durability is also good.

  The non-pneumatic tire of the present invention preferably has a primer layer between the skeleton member and the ultraviolet shielding layer. By providing a primer layer between the skeleton member and the ultraviolet shielding layer, the ultraviolet shielding layer becomes difficult to peel off from the skeleton member, so that the ultraviolet shielding effect by the ultraviolet shielding layer can be maintained over a long period of time. Durability can be further improved.

  In the non-pneumatic tire of the present invention, the ultraviolet shielding layer preferably contains at least one polymer selected from the group consisting of a fluorine-based polymer, an acrylic polymer, a silicon-based polymer, and a urethane-based polymer. When the ultraviolet shielding layer contains at least one of a fluorine-based polymer, an acrylic polymer, a silicon-based polymer, and a urethane-based polymer, it is possible to further suppress the occurrence of cracks in the ultraviolet shielding layer.

Such an ultraviolet shielding layer is prepared by, for example, dissolving at least one polymer selected from the group consisting of a fluorine-based polymer, an acrylic polymer, a silicon-based polymer, and a urethane-based polymer in an organic solvent to prepare a coating material for forming an ultraviolet shielding layer. Then, the ultraviolet shielding layer-forming coating material can be applied to the skeleton member, or the skeleton member can be immersed in the ultraviolet shielding layer-forming coating material and dried.
When a primer layer is provided between the skeleton member and the ultraviolet shielding layer, a primer layer forming paint is applied to the skeleton member, or the skeleton member is immersed in the primer layer forming paint and dried. After the primer layer is formed on the surface, the ultraviolet shielding layer-forming coating material is applied on the primer layer, or the skeleton member with the primer layer is immersed in the ultraviolet shielding layer-forming coating material and dried. Thus, an ultraviolet shielding layer can be provided on the skeleton member.
Here, the application method, the dipping method, the drying method, the drying conditions, and the like are not particularly limited, and can be appropriately set according to the properties of the coating material and the skeleton member used.

The ultraviolet shielding layer is a polymer composition obtained by adding an inorganic ultraviolet shielding agent such as titanium oxide or zinc oxide to the polymer described above, or an organic ultraviolet absorber such as benzotriazole or benzophenone, or a benzotriazole to the polymer. It can be formed using a polymer obtained by copolymerizing a reactive monomer such as a monomer based on benzophenone, or a polymer obtained by copolymerizing a hindered amine based reactive monomer.
The ultraviolet shielding layer-forming coating material can also be prepared by mixing a main agent and a curing agent containing or forming the polymer and a diluent.
In addition, as the coating material for forming the ultraviolet shielding layer, a commercially available product can be used. Examples of the main agent include trade names “Supura # 001” and “Supura # 005” manufactured by Mikuni Paint Co., Ltd. Examples of the curing agent include trade names “D02-375” and “D13-491” manufactured by Mikuni Paint Co., Ltd., and examples of the diluent include trade names “# 202FB thinner” manufactured by Mikuni Paint Co., Ltd. Can be mentioned.
The shear strength X and the thickness Y without the ultraviolet shielding layer are appropriately determined by adjusting the type of the coating material for forming the ultraviolet shielding layer, the coating amount of the coating material, and the solid content concentration in the coating material. Can be adjusted.

The primer layer preferably contains a polyolefin polymer modified with at least one selected from the group consisting of chlorine, acid, and amine (hereinafter sometimes referred to as “modified polyolefin polymer”). When the primer layer contains the modified polyolefin-based polymer, the ultraviolet shielding layer is more difficult to peel from the skeleton member, so that the ultraviolet shielding effect by the ultraviolet shielding layer can be further maintained, and the durability of the tire is further improved. Can be made.
In addition, a commercial item can be utilized as the said coating material for primer layer formation, for example, the brand name "0-1707 primer UN-2" by Mikuni Paint Co., Ltd. can be used.
Further, the thickness of the primer layer is not particularly limited, and can be appropriately adjusted by adjusting the coating amount of the primer layer-forming paint and the solid content concentration in the paint, for example.

  In the non-pneumatic tire of the present invention, the elastic modulus of the skeleton member is preferably 200 to 1500 MPa, and more preferably 250 to 1400 MPa. If the elastic modulus of the skeleton member is 200 MPa or more, the durability of the non-pneumatic tire is improved, and if the elastic modulus of the skeleton member is 1500 MPa or less, the riding comfort of the non-pneumatic tire is improved. Moreover, if the elastic modulus of the skeleton member is in the range of 200 to 1500 MPa, the effect of suppressing the occurrence of cracks in the ultraviolet shielding layer appears more remarkably.

In the non-pneumatic tire of the present invention, the skeleton member is preferably made of at least one resin material selected from the group consisting of polyamide resin, polyester resin, and polyolefin resin. When the skeleton member is formed of a polyamide resin, a polyester resin, or a polyolefin resin, durability against strain input applied to the non-pneumatic tire is improved.
The polyamide resin, polyester resin, and polyolefin resin may be a thermoplastic elastomer having a hard segment and a soft segment. Examples of the thermoplastic elastomer include a polyamide-based thermoplastic elastomer (TPA) and a polyester-based thermoplastic elastomer (TPC). ) And polyolefin-based thermoplastic elastomers (TPO).
The resin material may contain additives such as heat-resistant agents, anti-aging agents, antistatic agents, crystal nucleating agents, plasticizers, colorants, weathering agents, reinforcing materials, flame retardants, and the like. The content of the skeleton member is preferably 10% by mass or less, and the content of the resin material in the skeleton member is preferably 90% by mass or more.

A non-pneumatic tire according to the present invention includes an attachment body attached to an axle, an inner cylinder that is externally attached to the attachment body, and a ring member that has an outer cylinder that surrounds the inner cylinder from the outside in the tire radial direction, A plurality of connecting members arranged between the inner cylindrical body and the outer cylindrical body along the tire circumferential direction to connect the cylindrical bodies, and the ring member and the connection as the skeleton member It is preferable that the ultraviolet shielding layer is provided on at least a part of the member. Since such a non-pneumatic tire has a large strain due to input, the effect of suppressing the occurrence of cracks in the ultraviolet shielding layer appears more remarkably.
Hereinafter, a non-pneumatic tire according to a preferred embodiment of the present invention will be described in detail with reference to FIGS.

  The non-pneumatic tire 10 according to the present embodiment includes an attachment body 11 attached to an axle (not shown), an inner cylinder body 12 and an inner cylinder body 12 that are externally mounted on the attachment body 11, and surrounds the outer side in the tire radial direction. A plurality of ring members 14 having a cylindrical body 13 and an inner cylindrical body 12 and an outer cylindrical body 13 are disposed along the tire circumferential direction, and the cylindrical bodies 12 and 13 are relatively elastic. A connecting member 15 that is displaceably connected, and a tread member 16 that is disposed on the outer peripheral surface side of the outer cylindrical body 13 over the entire periphery thereof are provided.

  Here, the attachment body 11, the inner cylinder body 12, the outer cylinder 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 referred to as a tire circumferential direction. In addition, the attachment body 11, the inner cylinder body 12, the outer cylinder 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.

  Of the ring member 14, the outer cylindrical body 13 is larger in size in the tire width direction H than the inner cylindrical body 12, that is, the width is larger. 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 on the inner peripheral surface of the inner cylindrical body 12 at intervals in the tire circumferential direction. ing.

As shown in FIGS. 2 and 3, 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 mounting body 11. A plurality of ribs 19 that connect the cylindrical portion 17 and the outer ring portion 18 are provided.
The mounting cylinder part 17, the outer ring part 18, and the rib 19 are integrally formed of, for example, a metal material such as an aluminum alloy or a resin material such as polypropylene. The mounting cylinder portion 17 and the outer ring portion 18 are each formed in a cylindrical shape and are 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 18 a 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. The protrusions 12a of the inner cylinder 12 of the ring member 14 are fitted into these key groove portions 18a.
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. In addition, a pair of side wall surfaces rising from the inner peripheral surface of the inner cylindrical body 12 and a top wall surface facing the inner side in the tire radial direction out of the outer surface of the protruding portion 12a form a right angle. The sizes of the protrusion 12a and the key groove 18a in the tire circumferential direction are equal to each other.

  Here, at the edge of one side in the tire width direction H in the outer ring portion 18, a recess 18 b that is recessed toward the other side in the tire width direction H and into which the plate material 28 is fitted is located at a position corresponding to the key groove portion 18 a. Is formed. 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.

Then, the ring member 14 is bolted through the through hole of the plate member 28 fitted in the recess 18b in a state where the inner cylinder 12 is fitted on the attachment body 11 and the protrusion 12a is fitted in the key groove 18a. Is fixed to the attachment body 11 by screwing into the female thread portion. 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.
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.

The tread member 16 is formed in a cylindrical shape, and integrally covers the outer peripheral surface side of the outer cylindrical body 13 of the ring member 14 over the entire region. The tread member 16 is made of, for example, vulcanized rubber obtained by vulcanizing a rubber composition containing natural rubber or the like, or a thermoplastic material. Examples of the thermoplastic material include a thermoplastic elastomer or a thermoplastic resin. Examples of the thermoplastic elastomer include an amide-based thermoplastic elastomer (TPA), an ester-based thermoplastic elastomer (TPC), an olefin-based thermoplastic elastomer (TPO), and a styrene-based thermoplastic elastomer (TPS) defined in JIS K 6418. , Urethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), or other thermoplastic elastomer (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. When the tread member 16 is formed of vulcanized rubber, it is preferable to improve the adhesion between the outer cylinder 13 and the tread member 16 by applying an epoxy adhesive to the outer peripheral surface of the outer cylinder 13.

The connecting member 15 includes a first elastic connecting plate 21 and a second elastic connecting plate 22 that connect the inner cylinder 12 and the outer cylinder 13 in the ring member 14 to each other.
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 connection 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 connection plates 22 are separated from the first elastic connection 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 inner cylinder 12 and the outer cylinder 13 in the ring member 14 at positions that are point-symmetric with respect to the axis O. All the connecting members 15 have the same shape and size. Furthermore, the width of the connecting member 15 in the tire width direction is smaller than the width of the outer cylinder 13 in the tire width direction.

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.
Note that the widths in the tire width direction of the first elastic connecting plate 21 and the second elastic connecting plate 22 are equal to each other. The thicknesses of the first elastic connecting plate 21 and the second elastic connecting plate 22 in the tire side view are also equal to each other.

Here, in the first elastic connecting plate 21, one end 21 a connected to the outer cylinder 13 is located on one side in the tire circumferential direction from the other end 21 b connected to the inner cylinder 12, and Of the two elastic connecting plates 22, one end 22 a connected to the outer cylinder 13 is located on the other side in the tire circumferential direction with respect to the other end 22 b connected to the inner cylinder 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 outer cylindrical 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, 22c positioned between the one end portions 21a, 22a and the other end portions 21b, 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 elastic connecting plates 21 and 22 extend when the tire 1 is viewed from the side of the tire when viewed from the tire width direction H. In each of the connecting plates 21 and 22, the bending directions of the bending portions 21d to 21f and 22d to 22f adjacent to each other in the extending direction among the plurality of bending portions 21d to 21f and 22d to 22f 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 protrude toward the other side in the tire circumferential direction, a first curved portion 21d, and one end portion. Between the second curved portion 21e, which is located between the first curved portion 21d and the other end portion 21b, and between the first curved portion 21d and the other end portion 21b. And a third curved portion 21f that is curved so as to project toward one side in the tire circumferential 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 located between the second curved portion 22e, which is curved so as to protrude toward the other side in the tire circumferential direction, and between the first curved portion 22d and the other end 22b, and A third curved portion 22f that is curved so as to project toward the other side in the tire circumferential direction.
In the illustrated example, the first bending portions 21d and 22d have a larger radius of curvature in a 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 arranged at the center in the extending direction of the first elastic connecting plate 21 and the second elastic connecting plate 22.

  Further, the lengths of both elastic connecting plates 21 and 22 are equal to each other. Further, as shown in FIG. 5, the other end portions 21b and 22b of the both elastic connecting plates 21 and 22 are connected to the one end portions 21a and 22a and the tire radial direction on the outer peripheral surface of the inner cylindrical body 12 as viewed from the side of the tire. Are respectively connected to respective positions separated from each other by the same angle (for example, 20 ° or more and 135 ° or less) on one side and the other side in the tire circumferential direction around the axis O. In addition, the first curved portions 21d and 22d, the second curved portions 21e and 22e, and the third curved portions 21f and 22f of the first elastic connecting plate 21 and the second elastic connecting plate 22 are mutually connected to the tire. The direction of protrusion in the circumferential direction is opposite and the size is the same.

Thereby, as shown in FIG. 5, the shape of each connecting member 15 in the side view of the tire extends along the tire radial direction and passes through one end portions 21 a and 22 a of both connecting plates 21 and 22. The line L is line symmetric.
In each of the elastic connecting plates 21 and 22, the one end side portion extending from the center portion in the extending direction to the one end portions 21a and 22a is more than the other end side portion extending from the center portion to the other end portions 21b and 22b. The thickness is also increased. Thereby, while suppressing the increase in the weight of the connecting member 15 or ensuring the flexibility of the connecting member 15, the strength of the one end side portion where the first and second elastic connecting plates 21 and 22 are likely to be subjected to a large load 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.

  In this embodiment, the ring member 14 and the plurality of connecting members 15 are integrally formed. Furthermore, in this embodiment, as shown in FIG. 2, the ring member 14 includes a one-side split ring member 23 located on one side in the tire width direction H and the other side located on the other side in the tire width direction H. It is divided into a split ring member 24. In the illustrated example, the ring member 14 is divided at the center in the tire width direction H.

The one-side split ring member 23 is formed integrally with the first elastic connecting plate 21, and the other-side split ring member 24 is formed integrally with the second elastic connecting plate 22.
Further, in the present embodiment, the one-side split ring member 23 and the first elastic connecting plate 21, and the other-side split ring member 24 and the second elastic connecting plate 22 are integrally formed by casting or injection molding, respectively. .
Hereinafter, a structure in which the one-side split ring member 23 and the first elastic connecting plate 21 are integrally formed is referred to as a first split case body 31, and the other-side split ring member 24 and the second elastic connecting plate 22 are integrally formed. This is referred to as a second divided case body 32.

Here, the injection molding may be a general method in which each of the first and second divided case bodies 31 and 32 is molded simultaneously at the same time, or the first and second divided case bodies 31 and 32. In each of 32, one side, the other side split ring members 23, 24, and one of the first and second elastic connecting plates 21, 22 may be insert molding, and the other may be insert molding, or the so-called so-called insert molding. Two-color molding or the like may be used.
In each of the first and second split case bodies 31 and 32, the one side and the other side split ring members 23 and 24 and the first and second elastic connecting plates 21 and 22 are formed of different materials. Alternatively, the same material may be used. 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.
In addition, when each of the first and second divided case bodies 31 and 32 is simultaneously injection-molded separately, a plurality of protrusions 12a formed on the inner cylindrical body 12 may be used as a gate portion.

  In each of the first and second divided case bodies 31 and 32, the center part of the first and second elastic connecting plates 21 and 22 in the tire width direction H, the center part of the outer cylinder 13 in the tire width direction H, The central part of the inner cylinder 12 in the tire width direction H coincides with each other, the inner cylinder 12 is smaller in width than the outer cylinder 13, and the first elastic connecting plate 21 and the second elastic connecting plate 22 It is equivalent to each width.

Then, the edges in the tire width direction H of the outer cylinder 13 of the one-side split ring member 23 and the outer cylinder 13 of the other-side split ring member 24 are connected by, for example, welding, fusion, or adhesion. Has been. Of these, in the case of welding, for example, hot plate welding or the like may be employed.
Further, the ends in the tire width direction H of the inner cylinder 12 of the one-side split ring member 23 and the inner cylinder 12 of the other-side split ring member 24 are separated in the tire width direction H. Thereby, it is prevented that the burr | flash generate | occur | produces in the internal peripheral surface of the inner cylinder 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. 4 in a state before the connection between the 31 and 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, the outer casings 13 of the first split case body 31 and the second split case body 32 of the split case bodies 31 and 32 are oriented in the tire width direction H opposite to each other. The non-pneumatic tire 10 is obtained by abutting and connecting end edges in the tire width direction H.

  According to the non-pneumatic tire 10 according to the present embodiment, the first divided case body 31 in which the one-side divided ring member 23 and the first elastic connecting plate 21 are integrally formed, the other-side divided ring member 24 and the second elastic member. Since the connecting plate 22 is provided with the second divided case body 32 integrally formed, when assembling the non-pneumatic tire 10, both end portions 21a, 22a, 21b, and 22b 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 attachment body 11 without being connected to the inner cylinder body 12 and the outer cylinder body 13 separately, the manufacturing time can be shortened.

Further, since the first and second divided case bodies 31 and 32 are provided, for example, both end portions 21a, 22a, 21b, and 22b of the connecting member 15, the inner cylinder body 12 and the outer cylinder body 13 are connected to the fastening member. The weight can be reduced as compared with the case of connecting with the like.
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.

  In addition, one end 21 a connected to the outer cylinder 13 in the first elastic connecting plate 21 is located on one side in the tire circumferential direction from the other end 21 b connected to the inner cylinder 12, and the second Of the elastic connecting plate 22, one end 22 a connected to the outer cylinder 13 is located on the other side in the tire circumferential direction with respect to the other end 22 b connected to the inner cylinder 12. When an external force acts on the tire 10, the first elastic connecting plate 21 and the second elastic connecting plate 22 can be easily elastically deformed. Comfort can be ensured.

  Furthermore, in each of the 1st division | segmentation case body 31 and the 2nd division | segmentation case body 32, between the outer cylinder body 13 and the inner cylinder body 12, inside the 1st elastic connection board 21 and the 2nd elastic connection board 22, When the ring member 14 and the connecting member 15 are formed, only one of a plurality extending in a certain direction is disposed and the other extending in the other direction is not disposed in a side view of the tire. A case in which the ring member 14 and the connecting member 15 are formed integrally by forming the first and second divided case bodies 31 and 32 which are simple and easy to form, and the structure is complicated. This non-pneumatic tire 10 can be formed easily and reliably compared to the case of forming a body.

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 10 can be formed still more easily.
Moreover, 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 outer cylinder body 13 and the inner cylinder body 12. Thus, 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 inside the mold, and It is also possible to suppress the structure from becoming complicated, and the non-pneumatic tire 10 can be formed more easily and reliably.

  Further, since the connecting member 15 is formed symmetrically with respect to the virtual line L in a side view of the tire, the spring constant along one side in the tire circumferential direction and the spring along the other side in the non-pneumatic tire 10 It is possible to suppress the difference between the constant and the 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, 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.
In the above-described embodiment, a configuration in which the first elastic connecting plate 21 and the second elastic connecting plate 22 are provided as the connecting member 15, respectively. 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 with 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 inner cylinder 12 and the outer cylinder 13.

Further, each of the other end portions 21b and 22b of the first elastic connecting plate 21 and the second elastic connecting plate 22 is, for example, the axis O in the tire radial direction on the outer peripheral surface of the inner cylindrical body 12 instead of the embodiment. It may be connected to each of the positions opposite to each other with each other, or on the outer peripheral surface of the inner cylinder 12 to the one end portions 21a, 22a of the first elastic connecting plate 21 and the second elastic connecting plate 22. You may connect with the position etc. which oppose in a tire radial direction.
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 outer cylindrical 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 inner cylinder 12 of the one-side split ring member 23 and the inner cylinder 12 of the other-side split ring member 24.
Further, three or more ring members 14 may be divided in the tire width direction H or may not be divided.
Furthermore, 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.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

<Measurement of shear strength X without UV shielding layer only>
Using a coating strength tester “SAICS DN-GS type” manufactured by Daipura Wintes Co., Ltd., the horizontal speed of the cutting blade is 1.0 μm / sec, and the vertical speed of the cutting blade is 0.5 μm / sec. at a temperature 25 ° C., measured horizontal force F _H for cutting the ultraviolet shielding layer by cutting, the inclination of the horizontal force F _H, and that no shear strength X only ultraviolet shielding layer.

<Measurement method of thickness Y of ultraviolet shielding layer>
The cross section of the ultraviolet shielding layer was observed with an SEM (scanning electron microscope), and the thickness Y of the ultraviolet shielding layer was measured. Specifically, in SEM, a thickness that can be observed in a visual field expanded to an area / visual field of 25 μm × 20 μm or 150 μm × 120 μm was measured at N = 4, and the average was defined as thickness Y.

<Measuring method of elastic modulus of skeleton member>
According to JIS K 7161, the elastic modulus (tensile elastic modulus) of the skeleton member was measured.

<Production of non-pneumatic tire>
A non-pneumatic tire having a structure shown in FIGS. 2 to 5 was produced by using a polyamide-based thermoplastic elastomer (trade name “XPA9068F1” manufactured by Ube Industries, Ltd.) for the ring member and the connecting member. The tire size is a bicycle tire having an outer diameter of 20 inches (wheel size Φ340 mm, width 40 mm). Table 2 shows the elastic modulus of the frame member (ring member and connecting member) of the produced non-pneumatic tire.

  On the ring member and the connecting member of the produced non-pneumatic tire, a primer layer-forming coating material containing chlorine-modified polyolefin (Mikuni Paint Co., Ltd., trade name “0-1707 Primer UN-2”, modified with chlorine) A primer layer was formed by applying and drying (including a polyolefin-based polymer).

Further, an ultraviolet shielding layer was formed by applying and drying an ultraviolet shielding layer-forming coating composition shown in Table 1 on the prepared primer layer. In addition, about the example from which thickness differs even if it uses the coating material of the same mixing | blending, the coating amount of the coating material was adjusted respectively and the ultraviolet-ray shielding layer was formed. Table 2 shows the type of paint used, as well as the shear strength X and thickness Y not only of the formed ultraviolet shielding layer. FIG. 6 shows the relationship between the deemed shear strength X and the thickness Y of each ultraviolet shielding layer.
The non-pneumatic tire provided with the ultraviolet shielding layer was tested for adhesion of the ultraviolet shielding layer by the following method. The results are shown in Table 2.

<Adhesion test of UV shielding layer>
For each test tire, a hemispherical protrusion with a diameter of 20 mm was attached to the drum durability tester, and UV shielding was performed when traveling at 40 km / h under a load of 700 N in an environment of 25 ° C. and a humidity of 50% RH. The adhesion of the ultraviolet shielding layer was evaluated by measuring the distance traveled until the layer cracked.
In addition, about the result, the case where the traveling distance of each test tire exceeded 5000 km was evaluated as A, and the case where it was less than 5000 km was evaluated as B.

* 1 Main agent 1: Mikuni Paint Co., Ltd., trade name "Supra # 001", thermoplastic polyurethane main agent * 2 Main agent 2: Mikuni Paint Co., Ltd., trade name "Supura # 005", thermoplastic polyurethane main agent * 3 Curing agent 1: Mikuni Paint Co., Ltd., trade name “D02-375”, thermoplastic polyurethane curing agent * 4 Curing agent 2: Mikuni Paint Co., Ltd., trade name “D13-491”, thermoplastic polyurethane curing agent * 5 Diluent : Product name “# 202FB Thinner” manufactured by Mikuni Paint Co., Ltd.

  From the results shown in FIG. 6 and Table 2, the non-ultraviolet shielding layer-only shear strength X is 2 to 42 MPa, and the non-ultraviolet shielding layer-only shear strength X and thickness Y satisfy the formula (1). It can be seen that the occurrence of cracks in the ultraviolet shielding layer is suppressed, the adhesion (durability) of the ultraviolet shielding layer is improved, and the ultraviolet shielding effect can be maintained.

  1: frame member, 2: ultraviolet shielding layer, 3: cutting edge, 10: non-pneumatic tire, 11: attachment body, 12: inner cylinder body, 12a: protrusion, 13: outer cylinder body, 14: ring member 15: connecting member, 16: tread member, 17: mounting tube portion, 18: outer ring portion, 18a: key groove portion, 18b: recess, 18c: row of holes, 19: ribs, 19a: meat hole, 21: first 1 elastic connection plate (connection member), 22: second elastic connection plate (connection member), 21a, 22a: one end, 21b, 22b: other end, 21c, 22c: intermediate portion, 21d-21f, 22d-22f : Curved part, 23: one side split ring member, 24: other side split ring member, 28: plate material, 31: first split case body, 32: second split case body, H: tire width direction, L: virtual line , O: Line

Claims (7)

The skeleton member is a non-pneumatic tire made of a resin material,
At least a part of the skeleton member is provided with an ultraviolet shielding layer,
Only the ultraviolet shielding layer and the shear strength X is 2 to 42 MPa,
The non-ultraviolet shielding layer only shear strength X and the ultraviolet shielding layer thickness Y are expressed by the following formula (1):
Y ≦ −0.7624 × X + 48 (1)
A non-pneumatic tire characterized by satisfying: [wherein X is an ultraviolet shielding layer only shear strength (MPa) and Y is a thickness (μm) of the ultraviolet shielding layer]. The non-pneumatic tire includes an attachment body attached to an axle, an inner cylinder exteriorly mounted on the attachment body, a ring member having an outer cylinder body surrounding the inner cylinder body from an outer side in a tire radial direction, A plurality of members arranged along a tire circumferential direction between a cylindrical body and the outer cylindrical body, and a connecting member that connects the two cylindrical bodies;
The non-pneumatic tire according to claim 1, wherein the ultraviolet shielding layer is provided on at least a part of the ring member and the connecting member as the skeleton member.   The non-pneumatic tire according to claim 1 or 2, further comprising a primer layer between the skeleton member and the ultraviolet shielding layer.   The non-air according to any one of claims 1 to 3, wherein the ultraviolet shielding layer includes at least one polymer selected from the group consisting of a fluorine polymer, an acrylic polymer, a silicon polymer, and a urethane polymer. Enter tire.   The non-pneumatic tire according to claim 3 or 4, wherein the primer layer includes a polyolefin polymer modified with at least one selected from the group consisting of chlorine, acid, and amine.   The non-pneumatic tire according to any one of claims 1 to 5, wherein the elastic modulus of the skeleton member is 200 to 1500 MPa.   The non-pneumatic tire according to any one of claims 1 to 6, wherein the skeleton member is made of at least one resin material selected from the group consisting of a polyamide resin, a polyester resin, and a polyolefin resin.

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