Pneumatic radial tire for passenger vehicles

Patent metadata

Field	Value
Publication number	US-10214052-B2
Application number	US-201113695399-A
Country	US
Kind code	B2
Filing date	Mar 22, 2011
Priority date	Apr 30, 2010
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A run-flat tire of the present invention is a pneumatic radial tire for passenger vehicles which has a carcass composed of plies of radially arranged cords toroidally extending between a pair of bead portions, and the a W/L ratio of the section width W to the outer diameter L of the tire is 0.25 or less.

First claim

The invention claimed is:

1. A tire-ring assembly formed by assembling a pair of bead portions of a passenger vehicle pneumatic radial tire with a rim, the tire-rim assembly comprising:
a carcass composed of plies of radially arranged cords toroidally extending between the pair of bead portions; and
a belt,
wherein a W/L ratio of a section width W to an outer diameter L of the tire is 0.25 or less,
an air volume of the tire is 15000 cm 3 or more, and
W is equal to or larger than 145 mm,
wherein the tire-rim assembly is inflated under pressure and filled only with gas,
wherein the passenger vehicle pneumatic radial tire is a tubeless tire,
wherein an aspect ratio of the passenger vehicle pneumatic radial tire is greater than or equal to 50 and less than 70,
wherein W and D satisfy:
0.30<W/D<0.52, where D represents a rim diameter of the tire,
wherein the rim diameter of the tire is greater than or equal to 457.2 mm and less than or equal to 533.4 mm, and
wherein the outer diameter of the tire is greater than or equal to 642.1 mm and less than or equal to 725.9 mm.

2. The tire-rim assembly according to claim 1 , wherein the W/L ratio is 0.24 or less.

3. The tire-rim assembly according to claim 1 , further comprising a reinforcement member composed of cords extending in a tire width direction at a crown portion of the carcass on the outer side in a tire radial direction.

4. The tire-rim assembly according to claim 3 ,
wherein the belt including a plurality of belt layers and a tread are sequentially disposed on the reinforcement member on the outer side in the tire radial direction, and
the reinforcement member has a length in a tire width direction corresponding to 50% to 100% of a length of a belt layer having a maximum length in the tire width direction among the belt layers.

5. The tire-rim assembly according to claim 3 ,
wherein a belt composed of a plurality of belt layers and a tread are sequentially disposed on the reinforcement member on the outer side in the tire radial direction,
a plurality of main grooves extending along a tire equator are provided in the tread, and
the reinforcement member is disposed at a position corresponding to an outermost main groove in the tire width direction.

6. The tire-rim assembly according to claim 5 , wherein a length of the reinforcement member in the tire width direction is 20 mm or more longer than a groove width of the outermost main groove in the tire width direction.

7. The tire-rim assembly according to claim 3 , wherein the reinforcement member has an out-of-plane bending stiffness of 6 N/mm or more, and has a tensile strength specified in JIS Z 2241 of 1255 kPa or more.

8. The tire-rim assembly according to claim 1 , wherein a size of the tire is one of 165/55R21, 155/55R19, 165/55R20, 165/65R19, 175/55R21, 165/55R19, 175/55R20, 175/65R19, 145/50R19, 145/55R19, and 145/60R18.

Assignees

• Kuwayama Isao
• Bridgestone Corp

Inventors

• Kuwayama Isao

Classifications

• B60C3/04 Primary

  characterised by the relative dimensions of the section, e.g. low profile (B60C3/06 takes precedence) · CPC title

• Y10T152/10855

  Characterized by the carcass, carcass material, or physical arrangement of the carcass materials · CPC title

• B60C9/28

  characterised by the belt or breaker dimensions or curvature relative to carcass (B60C9/30 takes precedence) · CPC title

• B60C9/2009

  comprising plies of different materials · CPC title

• B60C2009/2048

  characterised by special physical properties of the belt plies · CPC title