Pneumatic tire
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.
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.
2. 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.
3. 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.