JP2018103851A - Non-pressure tire and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-pressure tire in which creep resistance is improved.SOLUTION: A non-pressure tire T comprises: an inside annular part 1; an outside annular part 2 which is provided outside of the inside annular part 1 in a concentric state; and a connection part 3 for connecting the inside annular part 1 and the outside annular part 2. The inside annular part 1, the outside annular part 2 and the connection part 3 comprise respectively, a base material part 11, 21, 31 formed of an elastic material, and a fiber reinforced plastic 12, 22, 32 embedded in the base material part 11, 21, 31, flexure elastic moduli of the fiber reinforced plastics 12, 22 of the inside annular part 1 and the outside annular part 2 are 1 GPa or larger, and a tension elastic modulus of the fiber reinforced plastic 32 of the connection part 3 is 50 GPa or larger.SELECTED DRAWING: Figure 1

Description

  The present invention provides a non-pneumatic tire (non-) including an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. pneumatic tire) and a method for manufacturing the same.

  The pneumatic tire has a load supporting function, a shock absorbing ability from the ground contact surface, and a transmission ability (acceleration, stop, change of direction) such as power. For this reason, many vehicles, particularly bicycles, motorcycles, automobiles, It is used in trucks.

  In particular, these capabilities greatly contributed to the development of automobiles and other motor vehicles. Furthermore, the impact absorbing ability of pneumatic tires is useful for medical equipment and electronic equipment transport carts and other applications.

  Conventional non-pneumatic tires include, for example, solid tires, spring tires, cushion tires, and the like, but do not have the superior performance of pneumatic tires. For example, solid tires and cushion tires support the load by compressing the contact portion, but this type of tire is heavy and stiff, and does not have the ability to absorb shock like a pneumatic tire. Further, in the non-pneumatic tire, it is possible to improve the cushioning property by increasing the elasticity, but there is a problem that the load supporting ability or the durability as the pneumatic tire has is deteriorated.

  As a non-pneumatic tire, for example, Patent Document 1 below includes an attachment body attached to an axle, a ring-like body that surrounds the attachment body from the outside in a tire radial direction, the attachment body, and the ring-like body. And a non-pneumatic tire in which a reinforcing member is embedded in the connecting member, the connecting member being formed of a synthetic resin material.

  Further, Patent Document 2 below describes a non-pneumatic tire using a composite cylinder in which fibers are embedded in a resin base material as a reinforcing element.

  Further, in Patent Document 3 below, an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a plurality of connecting portions that connect the inner annular portion and the outer annular portion, A non-pneumatic tire is described in which an inner annular portion, an outer annular portion, and a connecting portion are formed of a resin material reinforced with reinforcing fibers.

  The non-pneumatic tires described in Patent Documents 1 to 3 are molded of a resin material, and creep due to a continuous load is likely to occur. In particular, when a load is applied to a part of the tire due to parking or the like, the portion may be deformed and may not be restored. There is a concern that the deformation of the tire may affect durability, riding comfort, fuel efficiency, and the like. However, the non-pneumatic tires described in Patent Documents 1 to 3 do not consider any creep resistance.

Japanese Patent Laid-Open No. 2006-88375 Special table 2011-515261 gazette JP2015-120393A

  Accordingly, an object of the present invention is to provide a non-pneumatic tire with improved creep resistance and a method for manufacturing the same.

The above object can be achieved by the present invention as described below.
That is, the non-pneumatic tire of the present invention includes an inner annular portion, an outer annular portion provided concentrically on the outer side of the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. A non-pneumatic tire,
The inner annular portion, the outer annular portion, and the connecting portion include a base material portion made of an elastic material, and a fiber reinforced plastic embedded in the base material portion,
The bending elastic modulus of the fiber reinforced plastic of the inner annular portion and the outer annular portion is 1 GPa or more, and the tensile elastic modulus of the fiber reinforced plastic of the connecting portion is 50 GPa or more.

  According to this configuration, since the inner annular portion and the outer annular portion are reinforced by the fiber reinforced plastic having a high bending elastic modulus, the shape change of the inner annular portion and the outer annular portion can be suppressed, while the connecting portion Is reinforced by a fiber reinforced plastic having a high tensile elastic modulus, so that the positional relationship between the inner annular portion and the outer annular portion can be maintained. As a result, creep resistance can be improved as a whole tire.

  In the non-pneumatic tire according to the present invention, it is preferable that the inner annular portion, the outer annular portion, and the fiber reinforced plastic of the connecting portion are coupled to each other and integrated.

  According to this configuration, since all the fiber reinforced plastics are integrated, the shape stability of the entire tire is increased, which is advantageous for suppressing permanent deformation.

  In the non-pneumatic tire according to the present invention, it is preferable that the base portion is made of thermosetting polyurethane.

  In the non-pneumatic tire according to the present invention, the thermosetting polyurethane preferably has a tensile modulus of 10 to 100 MPa.

  According to these configurations, the creep resistance can be effectively improved.

The non-pneumatic tire manufacturing method of the present invention includes an inner annular portion, an outer annular portion provided concentrically on the outer side of the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion. And the inner annular portion, the outer annular portion, and the connecting portion are made of a base material portion made of an elastic material, and a fiber reinforced plastic embedded in the base material portion. A method,
Using a mold having an inner annular cavity, an outer annular cavity, and a connecting cavity for molding the inner annular part, the outer annular part, and the connecting part,
Arranging the fiber reinforced plastics having a bending elastic modulus of 1 GPa or more in the inner annular cavity and the outer annular cavity, respectively,
Placing the fiber reinforced plastic having a tensile modulus of 50 GPa or more in the connection cavity;
Filling the inner annular cavity, the outer annular cavity, and the connecting cavity with a raw material liquid of an elastic material;
And solidifying the raw material liquid of the elastic material.

  According to this configuration, since the inner annular portion and the outer annular portion are reinforced by the fiber reinforced plastic having a high bending elastic modulus, the shape change of the inner annular portion and the outer annular portion can be suppressed, while the connecting portion Is reinforced by a fiber reinforced plastic having a high tensile elastic modulus, so that the positional relationship between the inner annular portion and the outer annular portion can be maintained. As a result, creep resistance can be improved as a whole tire.

  Further, in the non-pneumatic tire manufacturing method according to the present invention, before the step of filling the elastic material material liquid, the fiber reinforced plastic disposed in the inner annular cavity and the outer annular cavity, and the connection cavity It is preferable to include a step of combining and integrating the fiber reinforced plastic to be arranged.

  According to this configuration, since all the fiber reinforced plastics are integrated, the shape stability of the entire tire is increased, which is advantageous for suppressing permanent deformation.

Front view showing an example of the non-pneumatic tire of the present invention Front view showing an example of a manufacturing method of a non-pneumatic tire

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an example of a non-pneumatic tire of the present invention. Here, O indicates the axial center, CD indicates the tire circumferential direction, and H indicates the tire cross-sectional height.

  The non-pneumatic tire T of the present invention has a support structure SS that supports a load from a vehicle. However, the non-pneumatic tire T may include a member corresponding to a tread, a reinforcing member, a member for fitting with an axle or a rim, and the like on the outer side (outer peripheral side) and the inner side (inner peripheral side) of the support structure SS. Good.

  As shown in the front view of FIG. 1, the non-pneumatic tire T of the present embodiment includes an inner annular portion 1, an outer annular portion 2 provided concentrically on the outer side, and an inner annular portion 1. And a plurality of connecting portions 3 that connect the outer annular portion 2 to each other.

  The inner annular portion 1 is preferably a cylindrical shape having a constant thickness from the viewpoint of improving uniformity. Moreover, it is preferable to provide the inner peripheral surface of the inner annular portion 1 with irregularities or the like for maintaining fitting properties for mounting with an axle or a rim.

  The thickness of the inner annular portion 1 is preferably 1 to 20% of the tire cross-section height H and more preferably 2 to 10% from the viewpoint of reducing weight and improving durability while sufficiently transmitting force to the connecting portion 3. preferable.

  The inner diameter of the inner annular portion 1 is appropriately determined in accordance with the rim on which the non-pneumatic tire T is mounted and the dimensions of the axle. However, when an alternative to a general pneumatic tire is assumed, 250 to 500 mm is preferable, and 330 to 440 mm is more preferable.

  The width in the tire width direction of the inner annular portion 1 is appropriately determined according to the use, the length of the axle, and the like. However, when an alternative to a general pneumatic tire is assumed, 100 to 300 mm is preferable, and 130 to 250 mm is preferable. More preferred.

  The inner annular portion 1 includes a base material portion 11 made of an elastic material and an annular fiber reinforced plastic 12 embedded in the base material portion 11. The fiber reinforced plastic 12 functions as a reinforcing layer. The width of the fiber reinforced plastic 12 in the tire width direction is the same as the width of the inner annular portion 1 in the tire width direction.

  The fiber reinforced plastic 12 of the inner annular portion 1 has a bending elastic modulus of 1 GPa or more. The fiber reinforced plastic 12 preferably has a flexural modulus of 7 GPa or less. When the bending elastic modulus of the fiber reinforced plastic 12 is less than 1 GPa, the creep resistance of the inner annular portion 1 becomes insufficient. The flexural modulus in the present invention is a value obtained by performing a bending test according to JIS K7171 and dividing the stress difference at 0.05% to 0.25% strain by the strain difference.

  The tensile modulus of the inner annular portion 1 excluding the fiber reinforced plastic 12 is preferably 1 to 30 MPa from the viewpoint of reducing weight, improving durability, and wearing properties while sufficiently transmitting force to the connecting portion 3. 10 MPa is more preferable. In addition, the tensile modulus in this embodiment is a value of a tensile stress when the tensile test is performed according to JIS K7312 and the elongation is 10%.

  The outer annular portion 2 is preferably cylindrical with a constant thickness from the viewpoint of improving uniformity.

  The thickness of the outer annular portion 2 is preferably 1 to 20% of the tire cross-section height H, and preferably 2 to 10% from the viewpoint of reducing weight and improving durability while sufficiently transmitting the force from the connecting portion 3. More preferred.

  The inner diameter of the outer annular portion 2 is appropriately determined according to its use. However, when an alternative to a general pneumatic tire is assumed, 420 to 750 mm is preferable, and 480 to 680 mm is more preferable.

  The width of the outer annular portion 2 in the tire width direction is appropriately determined according to the use, the length of the axle, and the like. However, when an alternative to a general pneumatic tire is assumed, 100 to 300 mm is preferable, and 130 to 250 mm is preferable. More preferred.

  The outer annular portion 2 includes a base material portion 21 made of an elastic material and an annular fiber reinforced plastic 22 embedded in the base material portion 21. The fiber reinforced plastic 22 functions as a reinforcing layer. The width of the fiber reinforced plastic 22 in the tire width direction is the same as the width of the outer annular portion 2 in the tire width direction.

  The fiber reinforced plastic 22 of the outer annular portion 2 has a bending elasticity of 1 GPa or more. The fiber reinforced plastic 22 preferably has a bending elasticity of 7 GPa or less. When the flexural modulus of the fiber reinforced plastic 22 is less than 1 GPa, the creep resistance of the outer annular portion 2 becomes insufficient.

  The tensile modulus of the outer annular portion 2 excluding the fiber reinforced plastic 22 is preferably 1 to 30 MPa from the viewpoint of reducing weight, improving durability, and wearing properties while sufficiently transmitting force to the connecting portion 3. 10 MPa is more preferable.

  The connecting portion 3 connects the inner annular portion 1 and the outer annular portion 2, and a plurality of connecting portions 3 are provided so as to be independent from each other in the tire circumferential direction CD with an appropriate interval therebetween. The connecting portion 3 is preferably provided regularly in the tire circumferential direction CD from the viewpoint of improving uniformity.

  The number of connecting portions 3 of the entire tire is preferably 10 to 80, and 40 to 60 from the viewpoint of reducing weight, improving power transmission, and improving durability while sufficiently supporting the load from the vehicle. More preferred. FIG. 1 shows an example in which 40 connecting portions 3 are provided.

  Examples of the shape of each connecting portion 3 include a plate-like body and a columnar body. In this embodiment, an example of a plate-like body is shown. These connecting portions 3 extend in a tire radial direction or a direction inclined from the tire radial direction in a front view. In the present invention, in the front view, the extending direction of the connecting portion 3 is preferably within ± 30 ° in the tire radial direction, and more preferably within ± 15 ° in the tire radial direction. In FIG. 1, the connection part 3 shows the example extended in the tire radial direction.

  The thickness of the connecting portion 3 in the tire circumferential direction CD is such that the tire cross-section height is increased from the viewpoint of reducing weight, improving durability, and improving lateral rigidity while sufficiently transmitting the force from the inner annular portion 1 and the outer annular portion 2. 1-30% of the length H is preferable, and 1-20% is more preferable.

  The width of the connecting portion 3 in the tire width direction is appropriately determined depending on the application and the like, but is preferably 100 to 300 mm, and more preferably 130 to 250 mm when an alternative to a general pneumatic tire is assumed.

  The connecting portion 3 includes a base material portion 31 made of an elastic material and a fiber reinforced plastic 32 embedded in the base material portion 31. The fiber reinforced plastic 32 functions as a reinforcing layer. The width of the fiber reinforced plastic 32 in the tire width direction is the same as the width of the connecting portion 3 in the tire width direction.

  In the present embodiment, the fiber reinforced plastic 32 is embedded only in four of the plurality of connecting portions 3, but the present invention is not limited to this. It is preferable to embed the fiber reinforced plastic 32 in three or more connecting portions 3, and the fiber reinforced plastic 32 may be embedded in all the connecting portions 3. The plurality of fiber reinforced plastics 32 are preferably provided at equal intervals in the tire circumferential direction CD in consideration of balance.

  The fiber reinforced plastic 32 of the connection part 3 has a tensile elastic modulus of 50 GPa or more. The fiber reinforced plastic 32 preferably has a tensile modulus of 300 GPa or less. When the tensile elastic modulus of the fiber reinforced plastic 32 is less than 50 GPa, the creep resistance of the connecting portion 3 becomes insufficient. The tensile modulus in the present invention is a value obtained by conducting a tensile test according to JIS K7312 and dividing the stress difference at 5% to 10% strain by the strain difference.

  The tensile modulus of the connecting portion 3 excluding the fiber reinforced plastic 32 is preferably 1 to 30 MPa from the viewpoint of reducing the weight, improving the durability, and improving the lateral rigidity while sufficiently transmitting the force from the inner annular portion 1. 2-10 MPa is more preferable.

  The non-pneumatic tire T is integrally formed of an elastic material as a whole except for the fiber reinforced plastics 11, 21, and 31. The elastic material in the present invention refers to a material having a tensile modulus calculated from a tensile stress at 10% elongation by a tensile test according to JIS K7312 and 100 MPa or less. The elastic material of the present invention preferably has a tensile elastic modulus of 10 to 100 MPa, more preferably 20 to 80 MPa from the viewpoint of imparting adequate rigidity while obtaining sufficient durability. Examples of the elastic material used as the base material include thermoplastic elastomers, crosslinked rubbers, and other resins.

  Examples of the thermoplastic elastomer include polyester elastomer, polyolefin elastomer, polyamide elastomer, polystyrene elastomer, polyvinyl chloride elastomer, polyurethane elastomer and the like. Rubber materials constituting the crosslinked rubber material include natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IIR), nitrile rubber (NBR), hydrogenated nitrile rubber (hydrogenated NBR). And synthetic rubbers such as chloroprene rubber (CR), ethylene propylene rubber (EPDM), fluorine rubber, silicon rubber, acrylic rubber, and urethane rubber. These rubber materials may be used in combination of two or more as required.

  Examples of other resins include thermoplastic resins and thermosetting resins. Examples of the thermoplastic resin include polyethylene resin, polystyrene resin, and polyvinyl chloride resin, and examples of the thermosetting resin include epoxy resin, phenol resin, polyurethane resin, silicon resin, polyimide resin, and melamine resin.

  Of the above elastic materials, a polyurethane resin is preferably used from the viewpoint of moldability / workability and cost. In addition, as an elastic material, you may use a foaming material, The thing which foamed said thermoplastic elastomer, crosslinked rubber, and other resin can also be used.

  Examples of the fiber reinforced plastics 12, 22, and 32 include carbon fiber reinforced plastic and glass fiber reinforced plastic. The reinforcing layer made of carbon fiber reinforced plastic can be easily formed by using a sheet-like intermediate member obtained by impregnating a thermosetting resin into a cloth (woven fabric) of carbon fibers.

  Next, a method for manufacturing the non-pneumatic tire T according to the present invention will be described. The method for manufacturing the non-pneumatic tire T uses a mold 9 having an inner annular cavity C1, an outer annular cavity C2, and a connecting cavity C3 for molding the inner annular portion 1, the outer annular portion 2, and the connecting portion 3, respectively. The fiber reinforced plastics 12 and 22 having a bending elastic modulus of 1 GPa or more are arranged in the inner annular cavity C1 and the outer annular cavity C2 in a ring shape, and the fiber reinforced plastic having a tensile elastic modulus of 50 GPa or more in the connection cavity C3. 32, a step of filling the inner annular cavity C1, the outer annular cavity C2, and the connecting cavity C3 with the raw material liquid of the elastic material, and a step of solidifying the raw material liquid of the elastic material.

  FIG. 2 is a plan view of a mold 9 used for manufacturing the non-pneumatic tire T. FIG. The inner annular cavity C1, the outer annular cavity C2, and the connecting cavity C3 have a cylindrical inner peripheral mold member 91, a cylindrical outer peripheral mold member 92, a disk-shaped bottom mold member 93, and a sector fan shape. It is formed by a core-type member 94 and a disk-shaped upper surface type member (not shown). In FIG. 2, the fiber reinforced plastic 12 is disposed in the inner annular cavity C1, the fiber reinforced plastic 22 is disposed in the outer annular cavity C2, and the fiber reinforced plastic 32 is disposed in the connection cavity C3.

  By the above-described steps, the inner annular portion 1, the outer annular portion 2 provided concentrically outside the inner annular portion 1, and the connecting portion 3 that couples the inner annular portion 1 and the outer annular portion 2 to each other are provided. In the pneumatic tire T, the inner annular portion 1, the outer annular portion 2, and the connecting portion 3 are embedded in the base material portions 11, 21, 31 and the base material portions 11, 21, 31 made of an elastic material. Fiber reinforced plastics 12, 22, and 32, the bending elastic modulus of the fiber reinforced plastics 12 and 22 in the inner annular portion 1 and the outer annular portion 2 is 1 GPa or more, and the tensile strength of the fiber reinforced plastic 32 in the connecting portion 3 A non-pneumatic tire T having an elastic modulus of 50 GPa or more can be manufactured. The integrally formed non-pneumatic tire T is removed from the mold 9 in the tire width direction.

  Further, in the method of manufacturing the non-pneumatic tire T, the fiber reinforced plastics 12 and 22 disposed in the inner annular cavity C1 and the outer annular cavity C2 and the connection cavity C3 are disposed before the step of filling the raw material liquid of the elastic material. It is preferable to include a step of combining and integrating the fiber reinforced plastic 32. Specifically, the annular fiber reinforced plastic 12 and the annular fiber reinforced plastic 22 are connected and integrated by a flat fiber reinforced plastic 32, and the integrated fiber reinforced plastics 12, 22, and 32 are as shown in FIG. It is preferable to arrange in the mold 9.

[Other Embodiments]
(1) The fiber reinforced plastic 12 of the inner annular portion 1 and the fiber reinforced plastic 22 of the outer annular portion 2 preferably include fibers extending in the tire circumferential direction CD and fibers extending in the tire width direction. Moreover, it is preferable that the fiber reinforced plastic 32 of the connection part 3 contains the fiber extended in the extension direction (tire radial direction in the example of FIG. 1) of the connection part 3, and the fiber extended in a tire width direction.

  (2) The non-pneumatic tire T may further include an intermediate annular portion provided concentrically outside the inner annular portion 1 and inside the outer annular portion 2. The intermediate annular portion may include a base material portion made of an elastic material and a fiber reinforced plastic embedded in the base material portion.

  Examples and the like specifically showing the configuration and effects of the present invention will be described below. Permanent deformation rate was used as an index of creep resistance. The amount of compression when a constant load (500 N) was applied to the produced simulated tire for 22 hours and the amount of residual strain after 1 hour after unloading were measured, and the amount of residual strain / compression was determined as the permanent deformation rate (%). Calculated as The smaller the permanent deformation rate, the better the creep resistance.

Comparative Examples and Examples Comparative Examples 1 to 3 and Examples 1 to 9 were made by changing the combinations of the fiber reinforced plastic of the inner annular part and the outer annular part and the fiber reinforced plastic of the connecting part as shown in Table 1. . The evaluation results are shown in Table 1.

  The “fiber reinforced plastic of the annular portion” in Table 1 is a type of fiber reinforced plastic of the inner annular portion and the outer annular portion, and “fiber reinforced plastic of the connection portion” is a type of fiber reinforced plastic of the connection portion. “Glass 1” means a glass fiber reinforced plastic, and the glass fiber reinforced plastic used is a laminate of seven layers of glass fibers, and has a tensile elastic modulus of 175 GPa and a bending elastic modulus of 3 GPa. “Glass 2” means a glass fiber reinforced plastic different from “Glass 1”, and the glass fiber reinforced plastic used is a laminate of two glass fibers with a tensile modulus of 70 GPa and bending. The elastic modulus is 1.5 GPa. “Carbon 1” means a carbon fiber reinforced plastic. The carbon fiber reinforced plastic used is a laminate of seven layers of carbon fibers, and has a tensile modulus of 230 GPa and a flexural modulus of 5 GPa.

  Further, “bonding of fiber reinforced plastic” in Table 1 represents whether or not the fiber reinforced plastics of the inner annular portion, the outer annular portion, and the connecting portion are bonded to each other. If it is combined, “Yes” is set. If not combined, “No” is set.

  From the results in Table 1, the following can be understood. The non-pneumatic tires of Examples 1 to 9 had improved creep resistance as compared with Comparative Example 1 in which no fiber reinforced plastic was embedded. In addition, the non-pneumatic tires of Comparative Example 2 and Comparative Example 3 in which the fiber reinforced plastics were embedded only in the inner annular portion and the outer annular portion had substantially the same creep resistance as Comparative Example 1. Thereby, it turns out that creep resistance improves by embedding fiber reinforced plastic in all of an inner side annular part, an outer side annular part, and a connection part.

DESCRIPTION OF SYMBOLS 1 Inner ring part 2 Outer ring part 3 Connection part 11 Base material part 12 Fiber reinforced plastic 21 Base material part 22 Fiber reinforced plastic 31 Base material part 32 Fiber reinforced plastic T Non-pneumatic tire

Claims (6)

A non-pneumatic tire comprising an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a connecting portion that connects the inner annular portion and the outer annular portion,
The inner annular portion, the outer annular portion, and the connecting portion include a base material portion made of an elastic material, and a fiber reinforced plastic embedded in the base material portion,
The non-pneumatic tire characterized in that the bending elastic modulus of the fiber reinforced plastic of the inner annular portion and the outer annular portion is 1 GPa or more, and the tensile elastic modulus of the fiber reinforced plastic of the connecting portion is 50 GPa or more. .   2. The non-pneumatic tire according to claim 1, wherein the fiber reinforced plastics of the inner annular portion, the outer annular portion, and the connecting portion are joined together.   The non-pneumatic tire according to claim 1, wherein the base material portion is made of a thermosetting polyurethane.   The non-pneumatic tire according to claim 3, wherein the thermosetting polyurethane has a tensile elastic modulus of 10 to 100 MPa. An inner annular portion, an outer annular portion concentrically provided on the outer side of the inner annular portion, and a connecting portion connecting the inner annular portion and the outer annular portion, the inner annular portion and the outer annular portion. And the connecting part is a method of manufacturing a non-pneumatic tire comprising a base part made of an elastic material and a fiber reinforced plastic embedded in the base part,
Using a mold having an inner annular cavity, an outer annular cavity, and a connecting cavity for molding the inner annular part, the outer annular part, and the connecting part,
Arranging the fiber reinforced plastics having a bending elastic modulus of 1 GPa or more in the inner annular cavity and the outer annular cavity, respectively,
Placing the fiber reinforced plastic having a tensile modulus of 50 GPa or more in the connection cavity;
Filling the inner annular cavity, the outer annular cavity, and the connecting cavity with a raw material liquid of an elastic material;
And a step of solidifying the raw material liquid of the elastic material. Prior to the step of filling the raw material liquid of the elastic material, the fiber reinforced plastic disposed in the inner annular cavity and the outer annular cavity and the fiber reinforced plastic disposed in the connection cavity are combined and integrated. The method for producing a non-pneumatic tire according to claim 5, further comprising a step.

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