Pneumatic tire

Patent metadata

Field	Value
Publication number	US-10239351-B2
Application number	US-201214375033-A
Country	US
Kind code	B2
Filing date	Oct 25, 2012
Priority date	Feb 21, 2012
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

[Solution] The tire 2 includes adhesive sheet layers 28. Each adhesive sheet layer 28 includes an interposed portion 58 and a protruding portion 60. The interposed portion 58 is interposed between a base layer 32 and a cap layer 34 of a tread 4. The protruding portion 60 is layered over a carcass 12. The adhesive sheet layers 28 are obtained by a rubber composition being crosslinked. The rubber composition contains a tackifier. A width W1 of the interposed portion 58 is preferably greater than or equal to 5 mm, and preferably not greater than 20 mm. A width W2 of the protruding portion 60 is preferably greater than or equal to 10 mm, and preferably not greater than 20 mm. A thickness of each adhesive sheet layer 28 is preferably greater than or equal to 0.5 mm, and preferably not greater than 2.0 mm. A ratio of an adhesive strength of each adhesive sheet layer 28 to an adhesive strength of the cap layer 34 is preferably greater than or equal to 1.30.

First claim

The invention claimed is:

1. A pneumatic tire comprising:
a tread including a base layer, and a cap layer that is disposed outward of the base layer in a radial direction and is layered over the base layer;
a pair of sidewalls that extend inward from ends, respectively, of the tread in the radial direction;
a pair of beads that are disposed inward of the sidewalls, respectively, in the radial direction;
a carcass that is extended, along the tread and the sidewalls, on and between both the beads;
a pair of adhesive sheet layers disposed such that a portion of each adhesive sheet layer is interposed between the base layer and the cap layer, and a remaining portion of each adhesive sheet layer is layered over the carcass in a region inward of each sidewall in an axial direction; and
a belt disposed outward of the carcass in the radial direction,
wherein, in an axial direction, an inner end of each adhesive sheet layer is disposed outwardly of the corresponding end of the belt,
wherein a thickness of each adhesive sheet layer is greater than or equal to 0.5 mm, and not greater than 2.0 mm, and
wherein each adhesive sheet layer has a constant thickness.

2. The tire according to claim 1 , wherein a width of the portion of each adhesive sheet layer interposed between the base layer and the cap layer is greater than or equal to 5 mm, and not greater than 20 mm.

3. The tire according to claim 1 , wherein a width of the portion of each adhesive sheet layer which is layered over the carcass is greater than or equal to 10 mm, and not greater than 20 mm.

4. The tire according to claim 1 , wherein a ratio of an adhesive strength of each adhesive sheet layer to an adhesive strength of the cap layer is greater than or equal to 1.30.

5. The tire according to claim 4 , wherein the ratio of an adhesive strength of each adhesive sheet layer to an adhesive strength of the cap layer is greater than or equal to 1.50.

6. The tire according to claim 1 , wherein, in a measurement under conditions that an initial strain is 10%, a dynamic strain is ±2%, a frequency is 10 Hz, a deformation mode is tension, and a temperature is 30° C., a loss tangent tan δ is less than or equal to 0.30, and a complex elastic modulus E* is greater than or equal to 10.5 in the cap layer.

7. The tire according to claim 1 , wherein a rubber composition of the adhesive sheet layers contains a tackifier.

8. The tire according to claim 7 , wherein an amount of the tackifier with respect to 100 parts by mass of a base rubber of the adhesive sheet layer is greater than or equal to 5 parts by mass.

9. A pneumatic tire comprising:
a tread including a base layer, and a cap layer that is disposed outward of the base layer in a radial direction and is layered over the base layer;
a pair of sidewalls that extend radially inward from opposite ends of the tread;
a pair of beads that are disposed radially inward of the sidewalls;
a carcass extending along the tread and the sidewalls, on and between both the beads;
a belt between the carcass and cap layer of the tread, the belt having a first edge and a second edge spaced from the first edge in an axial direction; and
a pair of adhesive sheet layers, each adhesive sheet layer having a first portion disposed between the base layer and the cap layer, and a second portion over the carcass in each sidewall,
wherein each adhesive sheet layer is spaced from the belt in a direction extending from an equator of the tire to one of the beads so that the adhesive sheet layers do not overlap the belt,
wherein an interposed portion of each adhesive sheet layer is between the base layer and the cap layer, and a remaining portion of each adhesive sheet layer is layered over the carcass in a region inward of each sidewall in an axial direction, and
wherein a width of the remaining portion is equal to or greater than a width of the interposed portion.

10. The tire according to claim 9 , wherein each adhesive sheet layer has a constant thickness.

11. The tire according to claim 9 , wherein each adhesive sheet has a first end and a second end, a distance from the first end to the second end defining a width of each adhesive sheet,
wherein each adhesive sheet has a bottom surface contacting the base layer and the carcass in each sidewall and a top surface contacting the cap layer, a distance between the bottom surface and top surface defining a thickness of each adhesive sheet, and
wherein the width of each adhesive sheet is greater than the thickness of each adhesive sheet.

12. The tire according to claim 9 , wherein the width of the remaining portion is greater than or equal to 10 mm, and not greater than 20 mm.

13. The tire according to claim 12 , wherein the width of adhesive sheet is 40 mm, the width of the remaining portion is 20 mm and the width of the interposed portion is 20 mm.

Assignees

• Sumitomo Rubber Ind

Inventors

• Oba Ryo
• Utsumi Daisuke
• Hayashi Norio

Classifications

• B60C11/0008

  characterised by the tread rubber · CPC title

• B60C2011/0091

  built-up by narrow strip winding · CPC title

• B60C2011/0033

  Thickness of the tread · CPC title

• B60C2013/045

  comprising different sidewall rubber layers · CPC title

• B60C11/005 Primary

  with cap and base layers · CPC title