Pneumatic tire and method of manufacturing pneumatic tire

Patent metadata

Field	Value
Publication number	US-11458778-B2
Application number	US-201816004266-A
Country	US
Kind code	B2
Filing date	Jun 8, 2018
Priority date	Feb 21, 2012
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

A pneumatic tire is provided with a carcass layer and a sidewall rubber disposed on an outer side in a tire width direction of the carcass layer. Additionally, the pneumatic tire is provided with a resin coating applied on a predetermined region of a sidewall portion. Additionally, a minimum value of a wall thickness t of a rubber of the sidewall portion in the region applied with the resin coating is in a range of 0.05 mm≤t≤4.0 mm. Additionally, a thickness of the resin coating is in a range of 20 μm or more and 300 μm or less.

First claim

What is claimed is:

1. A pneumatic tire comprising a carcass layer, and a sidewall rubber disposed on an outer side in a tire width direction of the carcass layer, the pneumatic tire comprising
a resin coating applied on a predetermined region A of a sidewall portion, a minimum value of a wall thickness t of the sidewall rubber in the region A applied with the resin coating being in a range of 0.05 mm≤t≤4.0 mm;
wherein the resin coating is formed from a stacked plurality of coating layers, and the coating layers includes a lowermost layer formed from a coating composition having an adhesion with respect to the sidewall rubber, an intermediate layer formed from a urethane resin coating composition having a strength, and a top surface layer formed from a silicon resin coating composition having a luster.

2. The pneumatic tire according to claim 1 , wherein a breaking elongation of the sidewall rubber is in a range of 200% or more and 380% or less.

3. The pneumatic tire according to claim 1 , wherein an additive amount of an antioxidant to the sidewall rubber is in a range of 0.1 parts by weight or more and 2.0 parts by weight or less.

4. The pneumatic tire according to claim 1 , comprising a tire notation attached by printing on a surface of one or more region of the region A coated with the resin coating.

5. The pneumatic tire according to claim 1 , wherein a dynamic friction coefficient of a surface of the region A coated with the resin coating is 0.5 or less.

6. The pneumatic tire according to claim 1 , comprising a convex and concave portion on the region A applied with the resin coating.

7. The pneumatic tire according claim 1 , wherein a coating layer of an outermost layer that constitutes the resin coating and a coating layer on a lower layer of the outermost layer have mutually differing colors.

8. The pneumatic tire according to claim 1 , wherein the carcass layer has an end folded to the outer side in the tire width direction, and the end of the carcass layer is disposed in a position away from the region A applied with the resin coating, wherein the end of the carcass layer is defined as an edge of a carcass ply wound up in the tire radial direction.

9. The pneumatic tire according to claim 1 , wherein the thickness of the resin coating at a splice portion of the carcass layer is thinner than the thickness of the resin coating at another portion of the region A.

10. The pneumatic tire according to claim 1 , comprising a cylindrical annular structure made of metal and disposed surrounding a periphery in the tire radial direction of the carcass layer.

11. The pneumatic tire according to claim 1 , wherein the carcass layer is formed from aramid fibers.

12. The pneumatic tire according to claim 1 , wherein a thickness of the resin coating is in a range of 110 μm or more and 300 μm or less.

13. The pneumatic tire according to claim 1 , wherein the region A comprises a plurality of regions A including three rows of regions disposed at the predetermined intervals in the tire radial direction.

14. The pneumatic tire according to claim 1 , wherein the wall thickness t of the sidewall rubber in an entirety of the region A applied with the resin coating is in a range of 0.05 mm≤t≤4.0 mm.

15. A pneumatic tire comprising a carcass layer, and a sidewall rubber disposed on an outer side in a tire width direction of the carcass layer, the pneumatic tire comprising
a resin coating applied on a predetermined region A of a sidewall portion, a minimum value of a wall thickness t of the sidewall rubber in the region A applied with the resin coating being in a range of 0.05 mm≤t≤4.0 mm, wherein
the resin coating is formed from a stacked plurality of coating layers, individual layers of the stacked plurality coating layers being formed of different materials, and a dynamic friction coefficient of a surface of the region A coated with the resin coating is 0.5 or less; and
a thickness of the resin coating is in a range of 20 μm or more and 300 μm or less.

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Tanno Atsushi
• Matsuda Jun

Classifications

• B29D30/0662

  Accessories, details or auxiliary operations · CPC title

• B60C1/0025

  Compositions of the sidewalls · CPC title

• B29D2030/728

  Decorating or marking the sidewalls after tyre vulcanization · CPC title

• B60C13/02

  Arrangement of grooves or ribs · CPC title

• B60C13/002 Primary

  Protection against exterior elements · CPC title