Tire

Patent metadata

Field	Value
Publication number	US-12030343-B2
Application number	US-202217886488-A
Country	US
Kind code	B2
Filing date	Aug 12, 2022
Priority date	Aug 25, 2021
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

A tread of a tire can include a cap layer and a base layer. A loss tangent of the cap layer at 30° C. may be not greater than 0.30, and a loss tangent of the base layer at 30° C. may be less than the loss tangent of the cap layer at 30° C. The base layer can be inward of a reference end of the tread in an axial direction A fixing layer can be between the cap layer and a carcass in a radial direction. A first end of the fixing layer can be outward of an end of the base layer in the axial direction, or a position of the first end of the fixing layer can coincide with a position of the end of the base layer in the axial direction. Adhesiveness of the fixing layer can be higher than adhesiveness of the cap layer.

First claim

What is claimed is:

1. A tire comprising:
a tread;
a pair of sidewalls inward of the tread in a radial direction so as to be continuous with ends of the tread;
a pair of beads inward of the sidewalls in the radial direction;
a carcass inward of the tread and the pair of sidewalls so as to extend on and between one of the beads and another of the beads;
a belt between the tread and the carcass in the radial direction, the belt including multiple belt cords aligned with each other;
an inner liner inward of the carcass;
a pair of fixing layers spaced from each other in an axial direction; and
a band between the tread and the belt in the radial direction, the band comprising a helically wound band cord,
wherein the tread has a circumferential groove formed therein, and a groove depth of the circumferential groove being not greater than 7.0 mm,
wherein the tread comprises a cap layer and a base layer covered by the cap layer,
wherein a loss tangent of the cap layer at 30° ° C. is not greater than 0.30, and a loss tangent of the base layer at 30° C. is less than the loss tangent of the cap layer at 30° C.,
wherein the base layer is inward of a reference end of the tread in the axial direction,
wherein each said fixing layer is between the cap layer and the carcass in the radial direction,
wherein a first end of the fixing layer is outward of an end of the base layer in the axial direction, or a first position of the first end of the fixing layer coincides with a second position of the end of the base layer in the axial direction,
wherein adhesiveness of each said fixing layer is higher than adhesiveness of the cap layer,
wherein the band is a full band in which both ends oppose each other across an equator plane,
wherein each of the fixing layers directly contacts the cap tread at a first side of the fixing layer and directly contacts the carcass at a second side of the fixing layer opposite the first side,
wherein a distance from the reference end of the tread to the end of the base layer is not less than 5 mm and not greater than 15 mm,
wherein a distance from the first end of the fixing layer to the end of the base layer is not greater than 5 mm, and
wherein the first position of the first end of the fixing layer coincides with the second position of the end of the base layer in the axial direction.

2. The tire according to claim 1 , wherein a first portion of each said fixing layer directly contacts the carcass at the second side of the fixing layer and a second portion of each said fixing layer does not directly contact the carcass at the second side of the fixing layer.

3. The tire according to claim 1 , wherein each said fixing layer is formed of a rubber composition having a Mooney viscosity (ML 1+4) of not less than 45 and not greater than 80.

4. The tire according to claim 1 , wherein a ratio of the adhesiveness of each said fixing layer to the adhesiveness of the cap layer is not less than 1.30.

5. A tire comprising:
a tread;
a pair of sidewalls inward of the tread in a radial direction so as to be continuous with ends of the tread;
a pair of beads inward of the sidewalls in the radial direction;
a carcass inward of the tread and the pair of sidewalls so as to extend on and between one of the beads and another of the beads,
a belt between the tread and the carcass in the radial direction, the belt including multiple belt cords aligned with each other;
an inner liner inward of the carcass; and
a pair of fixing layers spaced from each other in an axial direction,
wherein the tread has a circumferential groove formed therein, and a groove depth of the circumferential groove being not greater than 7.0 mm,
wherein the tread comprises a cap layer and a base layer covered by the cap layer,
wherein a loss tangent of the cap layer at 30° C. is not greater than 0.30, and a loss tangent of the base layer at 30° C. is less than the loss tangent of the cap layer at 30° ° C.,
wherein the base layer is inward of a reference end of the tread in the axial direction,
wherein each said fixing layer is between the cap layer and the carcass in the radial direction,
wherein a first end of the fixing layer is outward of an end of the base layer in the axial direction, or a first position of the first end of the fixing layer coincides with a second position of the end of the base layer in the axial direction,
wherein adhesiveness of each said fixing layer is higher than adhesiveness of the cap layer,
wherein a distance from the reference end of the tread to the end of the base layer is not less than 5 mm and not greater than 15 mm,
wherein a distance from the first end of the fixing layer to the end of the base layer is not greater than 5 mm, and
wherein the first position of the first end of the fixing layer coincides with the second position of the end of the base layer in the axial direction.

6. The tire according to claim 5 , comprising a band between the tread and the belt in the radial direction, the band comprising a helically wound band cord,
wherein the band is a full band in which both ends oppose each other across an equator plane.

7. The tire according to claim 5 , comprising a pair of insulations between the carcass and the inner liner,
wherein a first end of each of the insulations is inward of an end of the belt in the axial direction, and
wherein a second end of each of the insulations is outward of a corresponding one of the beads in the radial direction.

8. The tire according to claim 5 , wherein each said fixing layer is formed of a rubber composition having a Mooney viscosity (ML 1+4) of not less than 45 and not greater than 80.

9. The tire according to claim 5 , wherein each said fixing layer is non-planar in shape in a side sectional view of the tire.

10. The tire according to claim 5 , wherein a second end of the fixing layer is in a zone from a third position distant from an end of the cap layer over 5 mm in an inward direction to a fourth position distant from the end over 10 mm in an outward direction.

11. The tire according to claim 10 , wherein a position of the second end of the fixing layer coincides with a position of the end of the cap layer in the axial direction, or the second end of the fixing layer is disposed outwardly of the end of the cap layer in the axial direction, and a distance from the end of the cap layer to the second end of the fixing layer is not greater than 5 mm.

12. The tire according to claim 5 , wherein each of the fixing layers directly contacts the cap tread at a first side of the fixing layer and directly contacts the carcass at a second side of the fixing layer opposite the first side.

13. The tire according to claim 12 , wherein a first portion of each said fixing layer directly contacts the carcass at the second side of the fixing layer and a second portion of each said fixing layer does not directly contact the carcass at the second side of the fixing layer.

14. The tire according to claim 5 , wherein a ratio of the adhesiveness of each said fixing layer to the adhesiveness of the cap layer is not less than 1.30.

15. The tire according to claim 14 , wherein the ratio of the adhesiveness of each said fixing layer to the adhesiveness of the cap layer is not less than 1.50.

16. The tire according to claim 5 , wherein a thickness of each said fixing layer is constant.

17. The tire according to claim 16 , wherein the thickness of each said fixing layer is not less than 0.5 mm and not greater than 2.0 mm.

Assignees

• Sumitomo Rubber Ind

Inventors

• Omori Chisato
• Osawa Takuya

Classifications

• B60C2011/0033

  Thickness of the tread · CPC title

• B60C9/18

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

• B60C9/023

  built up from narrow strips, individual cords or filaments, e.g. using filament winding · CPC title

• Y02T10/86

  Optimisation of rolling resistance, e.g. weight reduction · CPC title

• B60C2009/1857

  radially above the belt plies · CPC title