Airless tire

Patent metadata

Field	Value
Publication number	US-10189310-B2
Application number	US-201615332173-A
Country	US
Kind code	B2
Filing date	Oct 24, 2016
Priority date	Oct 23, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

An airless tire includes a tread ring, a hub and a spoke. The tread ring includes a tread rubber layer, a first reinforcing cord layer on radial direction inner side of the tread layer, a second reinforcing cord layer on radial direction inner side of the first cord layer, and a shear rubber layer between the cord layers, the cord layers have array layers including reinforcing cords, and topping rubber portions covering the array layers, each topping portion has an inner portion adjacent to the shear layer, and an outer portion, and the topping portion(s) has the inner portion formed of a composition including a rubber component which includes a butadiene rubber in content rate of 10 to 100% by mass, an α, β-unsaturated carboxylic acid metal salt in amount of 10 to 80 parts by weight with respect to 100 parts by mass of the component, and a peroxide.

First claim

What is claimed is:

1. An airless tire comprising:
a tread ring having a cylindrical form and a ground contact surface;
a hub positioned on a radial direction inner side of the tread ring and configured to be fixed to an axle; and
a spoke structure connecting the tread ring and the hub,
wherein the tread ring includes a tread rubber layer, a first reinforcing cord layer, a second reinforcing cord layer and a shear rubber layer such that the tread rubber layer has the ground contact surface, the first reinforcing cord layer is positioned on a radial direction inner side of the tread rubber layer, the second reinforcing cord layer is positioned on a radial direction inner side of the first reinforcing cord layer, and the shear rubber layer is positioned between the first reinforcing cord layer and the second reinforcing cord layer, the first reinforcing cord layer comprises a first array layer comprising a plurality of first reinforcing cords, and a first topping rubber portion covering the first array layer, the second reinforcing cord layer comprises a second array layer comprising a plurality of second reinforcing cords, and a second topping rubber portion covering the second array layer, each of the first topping rubber portion and the second topping rubber portion has an inner topping rubber portion adjacent to the shear rubber layer, and an outer topping rubber portion, and at least one of the first topping rubber portion and the second topping rubber portion has the inner topping rubber portion formed of a rubber composition comprising a rubber component such that the rubber component comprises a butadiene rubber in a content rate in a range of 10 to 100% by mass, an α,β-unsaturated carboxylic acid metal salt in an amount in a range of 10 to 80 parts by weight with respect to 100 parts by mass of the rubber component, and a peroxide.

2. The airless tire according to claim 1 , wherein each of the first topping rubber portion and the second topping rubber portion has the inner topping rubber portion.

3. The airless tire according to claim 2 , wherein at least one of the first topping rubber portion and the second topping rubber portion has the outer topping rubber portion formed of a rubber composition comprising a rubber component such that the rubber component comprises a butadiene rubber in a content rate in a range of 10 to 100% by mass, an α,β-unsaturated carboxylic acid metal salt in an amount in a range of 10 to 80 parts by weight of with respect to 100 parts by mass of the rubber component, and a peroxide.

4. The airless tire according to claim 3 , wherein each of the first topping rubber portion and the second topping rubber portion has the outer topping rubber portion.

5. The airless tire according to claim 4 , wherein each of the first topping rubber portion and the second topping rubber portion has the inner and outer topping rubber portions having the rubber compositions which have a same rubber composition.

6. The airless tire according to claim 5 , wherein the first reinforcing cord layer has a coating thickness To, by which the outer topping rubber portion protrudes to a radial direction outer side from an outer surface of the first reinforcing cords, in a range of 2.0 mm or less.

7. The airless tire according to claim 2 , wherein the shear rubber layer is formed of a rubber composition comprising a rubber component such that the rubber component comprises a butadiene rubber in a content rate in a range of 10 to 100% by mass, an α,β-unsaturated carboxylic acid metal salt in an amount in a range of 10 to 80 parts by weight with respect to 100 parts by mass of the rubber component, and a peroxide.

8. The airless tire according to claim 7 , wherein the tread ring is formed such that the inner topping rubber portion and the shear rubber layer have the rubber compositions which have a same rubber composition.

9. The airless tire according to claim 2 , wherein each of the array layer of the first reinforcing cords and the array layer of the second reinforcing cords has a sum of cross-sectional areas of reinforcing cords in a range of 2 to 100 mm 2 when the cross-sectional areas of the reinforcing cords are measured in a width of 5 cm in a width direction cross section perpendicular to a cord length direction.

10. The airless tire according to claim 3 , wherein the shear rubber layer is formed of a rubber composition comprising a rubber component such that the rubber component comprises a butadiene rubber in a content rate in a range of 10 to 100% by mass, an α,β-unsaturated carboxylic acid metal salt in an amount in a range of 10 to 80 parts by weight with respect to 100 parts by mass of the rubber component, and a peroxide.

11. The airless tire according to claim 10 , wherein the tread ring is formed such that the inner topping rubber portion and the shear rubber layer have the rubber compositions which have a same rubber composition.

12. The airless tire according to claim 3 , wherein each of the array layer of the first reinforcing cords and the array layer of the second reinforcing cords has a sum of cross-sectional areas of reinforcing cords in a range of 2 to 100 mm 2 when the cross-sectional areas of the reinforcing cords are measured in a width of 5 cm in a width direction cross section perpendicular to a cord length direction.

13. The airless tire according to claim 3 , wherein the shear rubber layer is formed of a rubber composition comprising a rubber component such that the rubber component comprises a butadiene rubber in a content rate in a range of 10 to 100% by mass, an α,β-unsaturated carboxylic acid metal salt in an amount in a range of 10 to 80 parts by weight with respect to 100 parts by mass of the rubber component, and a peroxide.

14. The airless tire according to claim 4 , wherein the first reinforcing cord layer has a coating thickness To, by which the outer topping rubber portion protrudes to a radial direction outer side from an outer surface of the first reinforcing cords, in a range of 2.0 mm or less.

15. The airless tire according to claim 14 , wherein the second reinforcing cord layer has a coating thickness Ti, by which the outer topping rubber portion protrudes to a radial direction inner side from an outer surface of the second reinforcing cords, in a range of 2.0 mm or less.

16. The airless tire according to claim 4 , wherein the second reinforcing cord layer has a coating thickness Ti, by which the outer topping rubber portion protrudes to a radial direction inner side from an outer surface of the second reinforcing cords, in a range of 2.0 mm or less.

17. The airless tire according to claim 5 , wherein the second reinforcing cord layer has a coating thickness Ti, by which the outer topping rubber portion protrudes to a radial direction inner side from an outer surface of the second reinforcing cords, in a range of 2.0 mm or less.

18. The airless tire according to claim 1 , wherein the shear rubber layer is formed of a rubber composition comprising a rubber component such that the rubber component comprises a butadiene rubber in a content rate in a range of 10 to 100% by mass, an α-β-unsaturated carboxylic acid metal salt in an amount in a range of 10 to 80 parts by weight with respect to 100 parts by mass of the rubber component, and a peroxide.

19. The airless tire according to claim 18 , wherein the tread ring is formed such that the inner topping rubber portion and the shear rubber layer have the rubber compositions which have a same rubber composition.

20. The airless tire according

Assignees

• Sumitomo Rubber Ind

Inventors

• Iwamura Wako
• Sugiya Makoto
• Terakawa Katsumi
• Shiga Kazuyoshi

Classifications

• B60C1/0016

  Compositions of the tread · CPC title

• B60C9/18

  Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers · CPC title

• B60C7/00 Primary

  Non-inflatable or solid tyres (B60C1/00 takes precedence) · CPC title

• B60B2900/121

  Resisting forces · CPC title

• B60C7/14

  using springs · CPC title