# US 9,004,129 B2 · Pneumatic tire

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- Number: US 9,004,129 B2
- Document ID: US9004129B2
- Status: Granted
- Kind: B2
- Application number: 13/737,574
- Filed: 2013-01-09
- Published: 2013-07-11
- Granted: 2015-04-14
- Earliest claimed: 2012-01-10
- Assignees: The Yokohama Rubber Co., Ltd.
- Applicants: The Yokohama Rubber Co., Ltd.
- Inventors: Yoshifumi Koishikawa
- Web page: https://patentgrep.com/patent/US9004129B2

## CPC

- B60C 19/00: Tyre parts or constructions not otherwise provided for
- B60C 5/14: with impervious liner or coating on the inner wall of the tyre
- B60C 2005/145: {made of laminated layers}
- B60C 2005/147: {characterised by the joint or splice}
- Y10T 152/10495: Pneumatic tire or inner tube
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A pneumatic tire in which an inner liner including a film mainly made of thermoplastic resin is attached to an inside of the tire via a tie rubber sheet, on an inner side of a carcass layer, and which has a lap-splice portion where end portions of the film in a tire circumferential direction overlap each other in a tire widthwise direction with tie rubber therebetween. A section of the film on a tire cavity side in the lap-splice portion has a portion where the film is thin over part or entirety of the width in the tire widthwise direction before the lap-splice portion, or a film thickness in the lap-splice portion is smaller than a film thickness in a portion other than the lap-splice portion. Thus, the pneumatic tire has no crack developing around the lap-splice portion of an inner liner layer after running, and has excellent durability.

## Claims

### Claim 1

A pneumatic tire comprising:
a carcass layer; and
an inner liner including a film including a thermoplastic resin that is attached to an inside of the tire via a tie rubber sheet on an inner side of the carcass layer, the inner liner having a lap-splice portion where end portions of the film in a tire circumferential direction overlap each other in a tire widthwise direction with tie rubber therebetween, a section of the film on a tire cavity side in the lap-splice portion having a portion where the film is thin over part or entirety of the width in the tire widthwise direction before the lap-splice portion, a circumferential-direction overlap length of the lap-splice portion being 3 to 30 mm, a tire-circumferential-direction length of the portion where the film is thin being 0.1 to 10 mm, and a thickness of the portion where the film is thin being 20% to 80% of a thickness of the film.

### Claim 2 (depends on 1)

The pneumatic tire according to claim 1, wherein
the film is thin over part of the width in the tire widthwise direction before the lap-splice portion; and
the portion where the film is thin exists at least in a region between a belt end portion and a tip of a bead filler portion in a cross section along a tire meridian line.

### Claim 3 (depends on 1)

The pneumatic tire according to claim 1, wherein
the film is thin over the entirety of the width in the tire widthwise direction before the lap-splice portion.