Pneumatic tire, and method of manufacturing pneumatic tire

1. A pneumatic tire comprising:

a cylindrical annular structure that is disposed around a rotational axis and that has an outer surface and an inner surface, wherein the annular structure is made of a single metal plate member;

a carcass portion at least a part of which is disposed on an outer side of the annular structure in a direction parallel to the rotational axis, the carcass portion having a cord covered by rubber;

a rubber layer having an inner surface disposed so as to face the outer surface of the annular structure, the rubber layer including a tread portion; and

at least one fiber so as to suppress generation of a gas space between the annular structure and the rubber layer, a diameter of the at least one fiber being not less than 0.03 mm and not greater than 1.00 mm; wherein

the outer surface of the annular structure and the inner surface of the rubber layer are in contact with each other;

the fiber is disposed on a contact surface between the outer surface of the annular structure and the inner surface of the rubber layer;

at least a part of the carcass portion is disposed so as to face the inner surface of the annular structure; and

the at least one fiber is disposed between the annular structure and the carcass portion so as to suppress generation of a gas space between the annular structure and the carcass portion.

2. The pneumatic tire according to claim 1 , wherein a plurality of fibers are disposed between the annular structure and the rubber layer.

3. The pneumatic tire according to claim 1 , wherein a plurality of the fibers are disposed between the annular structure and the carcass portion.

4. The pneumatic tire according to claim 1 , wherein at least one of the fibers is disposed in a 100 mm square region on a surface of the annular structure, and five or more of the fibers are not disposed in a 10 mm square region on the surface of the annular structure.

5. The pneumatic tire according to claim 1 , wherein a linear density of the at least one fiber is not less than 1×10 −6 g/mm and not greater than 1×10 −4 g/mm.

6. The pneumatic tire according to claim 1 , wherein the annular structure has a plurality of through holes that penetrate the outer surface and the inner surface.

7. The pneumatic tire according to claim 1 , wherein the at least one fiber is disposed so as to surround the rotational axis.

8. The pneumatic tire according to claim 1 , wherein the at least one fiber is disposed so as to be in parallel with the rotational axis.

9. The pneumatic tire according to claim 1 , wherein:

a distance between adjacent fibers is set to be 10 mm or more and 50 mm or less,

one or more and four or less of the fibers are disposed in a 100 mm square region on the outer surface of the annular structure, and

a linear density of the at least one fiber is 1×10 −6 g/mm or more and 1×10 −4 g/mm or less.

10. The pneumatic tire according to claim 1 , wherein the at least one fiber is a thread-like member formed by arranging and twisting at least one of natural fiber or chemical fiber.

11. The pneumatic tire according to claim 1 , wherein the at least one fiber is a thread-like member formed by arranging and twisting at least one of natural fiber or chemical fiber.

12. The pneumatic tire according to claim 1 , wherein a dimension of the at least one fiber is identical or larger than a dimension of the annular structure in the direction parallel to the rotational axis.

13. A pneumatic tire, comprising:

a cylindrical annular structure that is disposed around a rotational axis and that has an outer surface and an inner surface, wherein the annular structure is made of a single metal plate member;

a carcass portion having an outer surface disposed so as to face the inner surface of the annular structure, the carcass portion having a cord covered by rubber;

a rubber layer having an inner surface disposed so as to face the outer surface of the annular structure, the rubber layer including a tread portion; and

at least one fiber so as to suppress generation of a gas space between the annular structure and the carcass portion; wherein:

the inner surface of the annular structure and the outer surface of the carcass portion are in contact with each other; and

the at least one fiber is disposed on a contact surface between the inner surface of the annular structure and the outer surface of the carcass portion.

14. The pneumatic tire according to claim 13 , wherein a plurality of fibers are disposed between the annular structure and the carcass portion.

15. The pneumatic tire according to claim 13 , wherein at least one of the fibers is disposed in a 100 mm square region on a surface of the annular structure, and five or more of the fibers are not disposed in a 10 mm square region on the surface of the annular structure.

16. The pneumatic tire according to claim 13 , wherein a linear density of the at least one fiber is not less than 1×10 −6 g/mm and not greater than 1×10 −4 g/mm, and

a diameter of the at least one fiber is not less than 0.03 mm and not greater than 1.00 mm.

17. The pneumatic tire according to claim 13 , wherein the annular structure has a plurality of through holes that penetrate the outer surface and the inner surface.

18. The pneumatic tire according to claim 13 , wherein the at least one fiber is disposed so as to surround the rotational axis.

19. The pneumatic tire according to claim 13 , wherein the at least one fiber is disposed so as to be in parallel with the rotational axis.

20. The pneumatic tire according to claim 13 , wherein the at least one fiber has a dimension less than a dimension of the annular structure in the direction parallel to the rotational axis and a dimension of the annular structure in a direction around the rotational axis, and a plurality of the fibers are disposed at an equal density in both the direction parallel to the rotational axis and the direction around the rotational axis.

21. The pneumatic tire according to claim 13 , wherein:

a distance between adjacent fibers is set to be 10 mm or more and 50 mm or less,

one or more and four or less of the fibers are disposed in a 100 mm square region on the inner surface of the annular structure,

a linear density of the at least one fiber is 1×10 −6 g/mm or more and 1×10 −4 g/mm or less, and

a diameter of the at least one fiber is 0.03 mm or more and 1.00 mm or less.

22. The pneumatic tire according to claim 13 , wherein a dimension of the at least one fiber is identical or larger than a dimension of the annular structure in the direction parallel to the rotational axis.

23. A pneumatic tire comprising:

a cylindrical annular structure that is disposed around a rotational axis and that has an outer surface and an inner surface, wherein the annular structure is made of a single plate member;

a carcass portion at least a part of which is disposed on an outer side of the annular structure in a direction parallel to the rotational axis, the carcass portion having a cord covered by rubber, and at least a part of the carcass portion being disposed so as to face the inner surface of the annular structure;

a rubber layer having an inner surface disposed so as to face the outer surface of the annular structure, the rubber layer including a tread portion;

a first fiber so as to suppress generation of a gas space between the annular structure and the rubber layer; and

a second fiber so as to suppress generation of a gas space between the annular structure and the carcass portion; wherein

the outer surface of the annular structure and the inner surface of the rubber layer are in contact with each other;

the inner surface of the annular structure and the outer surface of the carcass portion are in contact with each other;

the first fiber is disposed on a contact surface between the outer surface of the annular structure and the inner surface of the rubber layer; and

the second fiber is disposed on a contact surface between the inner surface of the annular structure and the outer surface of the carcass portion.