Tire

Patent metadata

Field	Value
Publication number	US-11633993-B2
Application number	US-202117197891-A
Country	US
Kind code	B2
Filing date	Mar 10, 2021
Priority date	Mar 24, 2020
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

A tire 2 includes a tread 4 , a pair of sidewalls 6 , a pair of beads 10 , a carcass 12 , a belt 14 , an inner liner 20 , and a pair of insertion layers 22 disposed between the carcass 12 and the inner liner 20 . Each insertion layer 22 is disposed between an end of the belt 14 and an end PB of the bead 10 . Each insertion layer 22 has a volume resistivity of less than 10 8 Ω·cm. A complex elastic modulus of the insertion layer 22 is equivalent to or higher than a complex elastic modulus of the inner liner 20 . A thickness of each sidewall 6 at a maximum width position PW is not greater than 5.0 mm.

First claim

What is claimed is:

1. A tire comprising:
a tread coming into contact with a road surface;
a pair of sidewalls disposed inwardly of the tread in a radial direction so as to be continuous with ends of the tread;
a pair of beads disposed inwardly of the sidewalls in the radial direction, the pair of beads having ring-shaped cores;
a carcass extended on and between one of the beads and another of the beads so as to be disposed inwardly of the tread and the sidewalls;
a belt disposed between the tread and the carcass in the radial direction;
an inner liner disposed inwardly of the carcass; and
a pair of insertion layers disposed between the carcass and the inner liner, wherein the carcass comprises a carcass ply,
the carcass ply comprises a ply body extended on and between one of the cores and another of the cores, and a pair of turned-up portions continuous with the ply body so as to be turned up around the cores, respectively, from an inner side toward an outer side in an axial direction;
the insertion layers are each disposed between an end of the belt and an end of a corresponding one of the beads,
the insertion layers each have a volume resistivity of less than 10 8 Ω·cm,
a complex elastic modulus of each insertion layer is equivalent to or higher than a complex elastic modulus of the inner liner, and
a thickness of each sidewall at a maximum width position is not greater than 5.0 mm.

2. The tire according to claim 1 , wherein a thickness of each insertion layer is not less than 0.2 mm and not greater than 1.0 mm.

3. The tire according to claim 1 , wherein the complex elastic modulus of each insertion layer is not less than 4.0 MPa.

4. The tire according to claim 1 ,
wherein an outer end of each insertion layer is disposed inwardly of the end of the belt in the axial direction, and
wherein an overlapping length over which each insertion layer and the belt overlap each other is not greater than 20 mm.

5. The tire according to claim 1 , wherein an inner end of each insertion layer is disposed inwardly of the end of a corresponding one of the beads in the radial direction.

6. The tire according to claim 1 , wherein an end of each turned-up portion is disposed inwardly of the maximum width position in the radial direction.

7. The tire according to claim 1 ,
wherein the carcass ply comprises multiple cords aligned with each other, and topping rubber covering the cords, and
wherein a material of each insertion layer is the same as a material of the topping rubber.

8. The tire according to claim 1 , wherein a ratio of the complex elastic modulus of each insertion layer to the complex elastic modulus of the inner liner is not greater than 4.9.

9. The tire according to claim 8 , wherein a ratio of the complex elastic modulus of each insertion layer to the complex elastic modulus of the inner liner is not less than 1.1.

10. The tire according to claim 1 ,
wherein the carcass comprises the one carcass ply,
wherein each bead comprises an inner apex disposed outwardly of a corresponding one of the cores in the radial direction, and an outer apex disposed outwardly of the inner apex in the radial direction,
wherein each turned-up portion is disposed between the outer apex and the inner apex, and
wherein an outer end of the outer apex corresponds to the end of each bead.

11. The tire according to claim 10 , wherein an inner end of each insertion layer is disposed inwardly of the end of a corresponding one of the beads in the radial direction.

12. The tire according to claim 10 , wherein an end of each turned-up portion is disposed inwardly of the maximum width position in the radial direction.

13. The tire according to claim 10 , wherein a height of the inner apex is not less than 5 mm and not greater than 20 mm.

14. The tire according to claim 10 , wherein a ratio of a turned-up portion height to a cross-sectional height is not less than 0.18 and not greater than 0.25.

15. The tire according to claim 10 , wherein an overlapping length over which each insertion layer and the belt overlap each other is not greater than 20 mm.

16. The tire according to claim 10 ,
wherein an outer end of each insertion layer is disposed inwardly of the end of the belt in the axial direction, and
wherein an overlapping length over which each insertion layer and the belt overlap each other is not greater than 30 mm.

17. The tire according to claim 16 , wherein an overlapping length over which each insertion layer and the belt overlap each other is not greater than 20 mm.

18. A tire comprising:
a tread coming into contact with a road surface;
a pair of sidewalls disposed inwardly of the tread in a radial direction so as to be continuous with ends of the tread;
a pair of beads disposed inwardly of the sidewalls in the radial direction, the pair of beads having ring-shaped cores;
a carcass extended on and between one of the beads and another of the beads so as to be disposed inwardly of the tread and the sidewalls;
a belt disposed between the tread and the carcass in the radial direction;
an inner liner disposed inwardly of the carcass; and
a pair of insertion layers disposed between the carcass and the inner liner, wherein the carcass comprises a carcass ply,
the carcass ply comprises a ply body extended on and between one of the cores and another of the cores, and a pair of turned-up portions continuous with the ply body so as to be turned up around the cores, respectively, from an inner side toward an outer side in an axial direction;
the insertion layers are each disposed between an end of the belt and an end of a corresponding one of the beads,
the insertion layers each have a volume resistivity of less than 10 8 Ω·cm,
a complex elastic modulus of each insertion layer is equivalent to or higher than a complex elastic modulus of the inner liner, and
a thickness of each sidewall at a maximum width position is not greater than 5.0 mm,
wherein a ratio of the complex elastic modulus of each insertion layer to the complex elastic modulus of the inner liner is not greater than 4.9 and not less than 1.1,
wherein a thickness of each insertion layer is not less than 0.2 mm and not greater than 1.0 mm,
wherein an outer end of each insertion layer is disposed inwardly of the end of the belt in the axial direction, and
wherein an overlapping length over which each insertion layer and the belt overlap each other is not greater than 20 mm.

19. The tire according to claim 18 , wherein an inner end of each insertion layer is disposed inwardly of the end of a corresponding one of the beads in the radial direction.

20. The tire according to claim 18 , wherein an end of each turned-up portion is disposed inwardly of the maximum width position in the radial direction.

Assignees

• Sumitomo Rubber Ind

Inventors

• Kikuchi Hiroshi
• Osawa Takuya
• Uno Hiroki
• Yagyu Kentaro

Classifications

• B60C15/0009

  features of the carcass terminal portion · CPC title

• B60C9/18

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

• B60C2015/009

  Height of the carcass terminal portion defined in terms of a numerical value or ratio in proportion to section height · CPC title

• B60C15/0036

  with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width · CPC title

• B60C2013/006

  Modulus; Hardness; Loss modulus or "tangens delta" · CPC title