Pneumatic tire

Patent metadata

Field	Value
Publication number	US-9227466-B2
Application number	US-201113996763-A
Country	US
Kind code	B2
Filing date	Nov 25, 2011
Priority date	Dec 24, 2010
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A pneumatic tire which uses, as an inner liner layer, a laminated sheet obtained by laminating an air permeation preventing layer, made of any one of a thermoplastic resin and a thermoplastic elastomer composition containing a blend of the thermoplastic resin and an elastomer, and a tie rubber layer, and which has high durability to prevent development of a crack in the tie rubber layer that occurs around a splice portion of the laminated sheet after the tire starts to be used. In the pneumatic tire, a sagged portion is formed by a concavo-convex structure in the air permeation preventing layer at least between points P and Q in a shape that a length La of a straight line connecting points P and Q and a length Lb of the air permeation preventing layer actually passing through points P and Q satisfy a relationship of (1.03×La)≦Lb≦(1.5×La).

First claim

The invention claimed is:

1. A pneumatic tire comprising:
one of a thermoplastic resin and a thermoplastic elastomer composition containing a blend of the thermoplastic resin and an elastomer for an air permeation preventing layer, such that a concavo-convex structure, including at least one of a concave portion and a convex portion, is formed in the air permeation preventing layer at least between a point P and a point Q in such a shape that a length La of a straight line connecting the point P and the point Q and a length Lb of the air permeation preventing layer actually passing through the point P and the point Q satisfy a relationship of (1.03×La)≦Lb≦(1.5×La), where the point P is a point at which a perpendicular line extending from a cavity-side end A of a splice portion of the air permeation preventing layer to the air permeation preventing layer on a non-cavity side intersects the air permeation preventing layer on the non-cavity side, and the point Q is a point at a position on the air permeation preventing layer away from the cavity-side end A of the splice portion of the air permeation preventing layer by 25 mm in a first direction of a tire circumferential direction toward a position where the air permeation preventing layer on the non-cavity side is exposed.

2. A pneumatic tire comprising:
one of a thermoplastic resin and a thermoplastic elastomer composition containing a blend of the thermoplastic resin and an elastomer for an air permeation preventing layer, such that a concavo-convex structure, including at least one of a concave portion and a convex portion, is formed in the air permeation preventing layer between a point A and a point R in such a shape that a length Xa of a straight line connecting the point A and the point R and a length Xb of the air permeation preventing layer actually passing through the point A and the point R satisfy a relationship of (1.02×Xa)≦Xb≦(1.5×Xa), where the point R is a point at a position on the air permeation preventing layer away from a cavity-side end A of a splice portion of the air permeation preventing layer by 25 mm in a tire circumferential direction opposite to a first direction of the tire circumferential direction which is toward a position where the air permeation preventing layer on a non-cavity side is exposed.

3. A pneumatic tire comprising:
one of a thermoplastic resin and a thermoplastic elastomer composition containing a blend of the thermoplastic resin and an elastomer for an air permeation preventing layer, such that the air permeation preventing layer comprises
a concavo-convex structure, including at least one of a concave portion and a convex portion, formed in the air permeation preventing layer at least between a point P and a point Q in such a shape that a length La of a straight line connecting the point P and the point Q and a length Lb of the air permeation preventing layer actually passing through the point P and the point Q satisfy a relationship of (1.03×La)≦Lb≦(1.5×La), where the point P is a point at which a perpendicular line extending from a cavity-side end A of a splice portion of the air permeation preventing layer to the air permeation preventing layer on a non-cavity side intersects the air permeation preventing layer on the non-cavity side, and the point Q is a point at a position on the air permeation preventing layer away from the cavity-side end A of the splice portion of the air permeation preventing layer by 25 mm in a first direction of a tire circumferential direction toward a position where the air permeation preventing layer on the non-cavity side is exposed; and
a concavo-convex structure, including at least one of a concave portion and a convex portion, formed in the air permeation preventing layer between a point A and a point R in such a shape that a length Xa of a straight line connecting the point A and the point R and a length Xb of the air permeation preventing layer actually passing through the point A and the point R satisfy a relationship of (1.02×Xa)≦Xb≦(1.5×Xa), where the point R is a point at a position on the air permeation preventing layer away from a cavity-side end A of a splice portion of the air permeation preventing layer by 25 mm in a tire circumferential direction opposite to the first direction.

4. The pneumatic tire according to claim 1 wherein
the concavo-convex structure designed to be formed in the air permeation preventing layer is formed when the pneumatic tire is manufactured by cure-molding using a bladder, by using a concavity-convexity shaping member between the bladder and the air permeation preventing layer, the concavity-convexity shaping member being made of at least a material selected from rubber, resin, and metal.

5. The pneumatic tire according to claim 1 , wherein the concavo-convex structure is formed in the air permeation preventing layer inside regions covering a width of at least 60 mm respectively from both ends, in a tire widthwise direction, of one of belt layers with the largest belt width toward bead parts.

6. The pneumatic tire according to claim 1 , wherein the length La of the straight line connecting the point P and the point Q and the length Lb of the air permeation preventing layer satisfy a relationship of (1.04×La)≦Lb≦(1.3×La).

7. The pneumatic tire according to claim 2 , wherein the length Xa of the straight line connecting the point A and the point R and the length Xb of the air permeation preventing layer satisfy a relationship of (1.03×Xa)≦Xb≦(1.3×Xa).

8. The pneumatic tire according to claim 2 , wherein the concavo-convex structure designed to be formed in the air permeation preventing layer is formed when the pneumatic tire is manufactured by cure-molding using a bladder, by using a concavity-convexity shaping member between the bladder and the air permeation preventing layer, the concavity-convexity shaping member being made of at least a material selected from rubber, resin, and metal.

9. The pneumatic tire according to claim 3 , wherein the concavo-convex structure designed to be formed in the air permeation preventing layer is formed when the pneumatic tire is manufactured by cure-molding using a bladder, by using a concavity-convexity shaping member between the bladder and the air permeation preventing layer, the concavity-convexity shaping member being made of at least a material selected from rubber, resin, and metal.

10. The pneumatic tire according to claim 2 , wherein the concavo-convex structure is formed in the air permeation preventing layer inside regions covering a width of at least 60 mm respectively from both ends, in a tire widthwise direction, of one of belt layers with the largest belt width toward bead parts.

11. The pneumatic tire according to claim 3 , wherein the concavo-convex structure is formed in the air permeation preventing layer inside regions covering a width of at least 60 mm respectively from both ends, in a tire widthwise direction, of one of belt layers with the largest belt width toward bead parts.

12. The pneumatic tire according to claim 4 , wherein the concavo-convex structure is formed in the air permeation preventing layer inside regions covering a width of at least 60 mm respectively from both ends, in a tire widthwise direction, of one of belt layers with the largest belt width toward bead parts.

13. The pneumatic tire according to claim 2 , wherein the length La of the straight line connecting the point P and the point Q and the length Lb of the air permeation preventing layer satisfy a relationship of (1.04×La)≦Lb≦(1.3×La).

14. The pneumatic tire according to claim 3 , wherein the length La of the straight line connecting the point P and th

Assignees

• Endo Toyoaki
• Hashimura Yoshiaki
• Seto Hideki
• Matsuda Jun
• Hara Yuichi
• Yokohama Rubber Co Ltd

Inventors

• Endo Toyoaki
• Hashimura Yoshiaki
• Seto Hideki
• Matsuda Jun
• Hara Yuichi

Classifications

• B29D2030/0683

  Additional internal supports to be positioned inside the tyre, as emergency supports for run-flat tyres · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• B32B2605/08

  Cars · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• B60C2005/145

  made of laminated layers · CPC title