tire

Abstract

A tire including a tread is provided, wherein the tire weight G (kg) is proportional to the maximum load capacity W of the tire. L (kg) ratio (G / W L ) is 0.0150 or less, wherein the tread has three or more rubber layers composed of a rubber composition containing a rubber component, and wherein the rubber composition of at least one of the three or more rubber layers has a tan δ at 30°C of 0.15 or more, and the complex elastic modulus (E*) of the rubber composition of at least one of the three or more rubber layers at 30°C is 30 ) is 5.0MPa or above.

Claims

1. A tire comprising a tread, in, Tire weight G (kg) and the maximum load capacity W of the tire L (kg) ratio (G / W L ) is less than 0.0150, wherein the tread has three or more rubber layers composed of a rubber composition containing a rubber component, The rubber composition of at least one of the three or more rubber layers has a tan δ at 30°C (tan δ at 30°C) of 0.15 or more, and the rubber composition of at least one of the three or more rubber layers has a complex elastic modulus (E*) at 30°C of 30 ) is 5.0 MPa or more, The tread comprises at least a first layer on the tread surface and a second layer adjacent to the radially inner side of the first layer, and the rubber composition of the first layer has a complex elastic modulus (E*) at 30°C. 30 ) is greater than the complex elastic modulus (E*) of the rubber composition of the second layer at 30°C 30 ).

2. The tire according to claim 1, wherein The rubber composition has a tan δ at 0° C. of 0.35 or greater.

3. The tire according to claim 1 or 2, wherein: A ratio of tan δ of the rubber composition at 30° C. to the tire weight G (kg) (30° C. tan δ / G) is greater than 0.

010.

4. The tire according to claim 1 or 2, wherein: The rubber composition has a specific gravity of 1.270 or less.

5. The tire according to claim 1 or 2, wherein: The content of the reinforcing filler is 110 parts by mass or less based on 100 parts by mass of the rubber component.

6. The tire according to claim 1 or 2, wherein: The rubber component contains 20% by mass or more of a butadiene rubber having a glass transition temperature of -14°C or lower.

7. The tire according to claim 1 or 2, wherein: The rubber composition has a tan δ at 30° C. of 0.28 or less.

8. The tire according to claim 1 or 2, wherein: The G / W L The complex elastic modulus (E*) of the rubber composition at 30°C 30 ) ratio ((G / W L ) / E* 30 ) is less than 0.00190.

9. The tire according to claim 1 or 2, wherein: The rubber composition has a tan δ at 30° C. of 0.15 to 0.28, and a tan δ / G at 30° C. of the rubber composition of 0.015 or more.

10. The tire according to claim 1 or 2, wherein: The content of silica is 50 to 110 parts by mass based on 100 parts by mass of the rubber component, and is 60% by mass or more based on 100% by mass in total of silica and carbon black.

11. The tire according to claim 1 or 2, wherein: The rubber component contains 20% to 50% by mass of a butadiene rubber having a glass transition temperature of -14°C or lower and 10% to 80% by mass of a styrene-butadiene rubber.

12. The tire according to claim 1 or 2, wherein: The tread has a land portion separated by a plurality of circumferential grooves, and Wherein, when the distance between the extension line of the land portion and the extension line of the deepest part of the groove bottom of the circumferential groove is defined as H, The rubber layer composed of the rubber composition is provided on at least a portion of a region extending from the outermost surface of the land portion to a distance H inward in the radial direction.

13. The tire according to claim 12, wherein: There are two or more rubber layers in a region extending radially inwardly from an outermost surface of the land portion to a distance H, and at least one of the two or more rubber layers is formed from the rubber composition.

14. The tire according to claim 1 or 2, wherein: The tread includes at least a first layer on the tread surface, a second layer adjacent to the radial inner side of the first layer, and a third layer adjacent to the radial inner side of the second layer, and wherein the tan δ of the rubber composition of the first layer at 30°C is greater than the tan δ of the rubber composition of the second layer at 30°C and the tan δ of the rubber composition of the third layer at 30°C.

15. The tire according to claim 1 or 2, wherein: The tread comprises at least a first layer on the tread surface, a second layer adjacent to the radially inner side of the first layer, and a third layer adjacent to the radially inner side of the second layer, wherein the rubber composition of the first layer has a complex elastic modulus (E*) at 30°C. 30 ) is greater than the complex elastic modulus (E*) of the rubber composition of the second layer at 30°C 30 ) and the complex elastic modulus (E*) of the rubber composition of the third layer at 30°C 30 ).

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