Pneumatic tire

Patent metadata

Field	Value
Publication number	US-9724970-B2
Application number	US-201414520720-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Nov 29, 2013
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

There is provided an pneumatic tire including a pair of left and right beads each including a bead core and a bead filler, and a carcass ply extending between the pair of beads, wherein the carcass ply is wound up around the bead core from the outside to the inside in the widthwise direction of the tire, and an end portion of the wind-up portion of the carcass ply is provided with notches at a plurality of positions in the circumference direction of the tire.

First claim

What is claimed is:

1. A pneumatic tire comprising:
a pair of left and right beads each including a bead core and a bead filler;
a carcass ply extending between the pair of beads, and
an inner liner arranged on an inner peripheral side of the carcass ply, wherein
the carcass ply is wound up around the bead core from outside to inside in the widthwise direction of the tire, and an end portion of the wind-up portion of the carcass ply is provided with notches at a plurality of positions in a circumference direction of the tire,
the inner liner is wound up around the bead core from the inside to the outside in the widthwise direction of the tire, and both end portions of the inner liner extend in between the bead cores and the carcass ply, and
the inner liner is a gas barrier rubber layer which does not comprise cords which does not comprise carcass cords.

2. The pneumatic tire according to claim 1 , wherein the notch have a V-shape.

3. The pneumatic tire according to claim 1 , wherein the notch are provided so as to satisfy relationships of H=0.5 h to 1.0 h and W=0.3 P to 1.0 P, where H is a height of the notch in the radial direction of the tire, W is a width in the circumference direction of the tire, P is an array pitch of the notches in the tire circumference direction, and h is a wind-up height of the carcass ply with reference to the position of a nominal rim diameter.

4. The pneumatic tire according to claim 1 , wherein the end portion of the wind-up portion of the carcass ply has a repeated shape having an amplitude in the radial direction of the tire, and the repeated shape includes depressions formed by the notches and projections between the notches.

5. The pneumatic tire according to claim 1 , further comprising a rubber chafer around the bead core, where the rubber chafer is arranged so as to cover at least the end portion of the wind-up portion of the carcass ply.

Assignees

• Toyo Tire & Rubber Co

Inventors

• Tomitaka Yu

Classifications

• B60C2015/009

  Height of the carcass terminal portion defined in terms of a numerical value or ratio in proportion to section height · CPC title

• B60C15/0009 Primary

  features of the carcass terminal portion · CPC title

• B60C15/0072

  with ply reverse folding, i.e. carcass layer folded around the bead core from the outside to the inside · CPC title