Pneumatic tire

Patent metadata

Field	Value
Publication number	US-2016272007-A1
Application number	US-201415029333-A
Country	US
Kind code	A1
Filing date	Jul 1, 2014
Priority date	Oct 29, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

A pneumatic tire includes a tread portion, carcass, inclined belt, and circumferential belt. The inclined belt is formed by inclined belt layer(s) including cords inclined relative to the tire circumferential direction. A circumferential main groove is provided in the tread portion. The inclined belt includes a high-angle inclined belt layer in which the cords are at an inclination angle of 35° to 90° relative to the tire circumferential direction. In at least one tread half portion, an edge of the high-angle inclined belt layer in the tire width direction is positioned further outward in the tire width direction than the circumferential main groove disposed furthest outward in the tire width direction. The interval in the tire width direction from the edge to the center of the circumferential main groove is 0.2W 1 to 0.35W 1 , where W 1 is the width of the high-angle inclined belt layer in the tire width direction.

First claim

1 . A pneumatic tire comprising:
a pair of bead portions; a tread portion; a carcass extending between the pair of bead portions; an inclined belt provided at an outer side of a crown portion of the carcass in a tire radial direction and formed by one or more inclined belt layers including cords that are inclined relative to a tire circumferential direction; and a circumferential belt provided at the outer side of the crown portion of the carcass in the tire radial direction and formed by one or more circumferential belt layers including cords that extend along the tire circumferential direction; wherein one or more circumferential main grooves extending along the tire circumferential direction are formed on a surface of the tread portion; as the one or more inclined belt layers, the inclined belt includes a high-angle inclined belt layer in which the cords are at an inclination angle of 35° or more to 90° or less relative to the tire circumferential direction; and in at least one tread half portion, an edge of the high-angle inclined belt layer in a tire width direction is positioned further outward in the tire width direction than a circumferential main groove disposed furthest outward in the tire width direction, and an interval in the tire width direction from the edge to a center of the circumferential main groove is 0.2W 1 or more to 0.35W 1 or less, where W 1 is a width of the high-angle inclined belt layer in the tire width direction.

2 . The pneumatic tire of claim 1 , wherein the circumferential belt has a higher tire circumferential direction rigidity per unit width in a central region including a tire equator than in a region on an outer side of the central region in the tire width direction.

3 . The pneumatic tire of claim 2 , comprising two of the circumferential belt layers in the central region and one of the circumferential belt layers in a region on an outer side of the central region in the tire width direction.

4 . The pneumatic tire of claim 1 , wherein
as the one or more inclined belt layers, the inclined belt further includes a low-angle inclined belt layer in which the cords are at an inclination angle that is smaller than the inclination angle of the cords in the high-angle inclined belt layer and is 30° or less relative to the tire circumferential direction; and a width of the low-angle inclined belt layer in the tire width direction is 0.6W 1 or less.

5 . The pneumatic tire of claim 4 , wherein as the inclined belt layers, the inclined belt includes only one layer of the high-angle inclined belt layer and one layer of the low-angle inclined belt layer.

6 . The pneumatic tire of claim 1 ,
wherein X is 700 or less when X=Ymn, where Y is Young's modulus of the cords in the one or more circumferential belt layers in GPa, m is the number of layers of the one or more circumferential belt layers, and n is the number of cords implanted per 50 mm.

Assignees

• Bridgestone Corp

Inventors

• Hatanaka Shintaro
• Kuwayama Isao

Classifications

• B60C2011/0353

  characterised by width · CPC title

• B60C2009/2019

  comprising cords at an angle of 30 to 60 degrees to the circumferential direction · CPC title

• B60C2009/2016

  comprising cords at an angle of 10 to 30 degrees to the circumferential direction · CPC title

• B60C15/00

  Tyre beads, e.g. ply turn-up or overlap · CPC title

• B60C2009/2266

  Density of the cords in width direction · CPC title