Tire

Patent metadata

Field	Value
Publication number	US-10836213-B2
Application number	US-201415031360-A
Country	US
Kind code	B2
Filing date	Jul 7, 2014
Priority date	Oct 29, 2013
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A passenger vehicle pneumatic tire comprising: a carcass; and inclined belt layers and a circumferential belt layer, wherein: the inclined belt layers include at least two inclined belt layers having different tire widthwise widths; an inclination angle θ1 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the widest width and an inclination angle θ2 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the narrowest width satisfy correlations that 30°≤θ1≤85°, 10°≤θ2≤30°, and θ1>θ2; and a tire widthwise width W1 of the inclined belt layer having the widest width and a tire widthwise width W2 of the inclined belt layer having the narrowest width satisfy a correlation that W2≤0.6W1.

First claim

The invention claimed is:

1. A passenger car pneumatic radial tire comprising:
a carcass toroidally extending between a pair of bead portions; and
inclined belt layers having cords inclined with respect to a tire circumferential direction and a circumferential belt layer having cords extending along the tire circumferential direction or inclined with respect to the tire circumferential direction at an angle of 5° or less, the inclined belt layers and the circumferential belt layer being disposed on a tire radial outer side of a crown portion of the carcass, wherein:
the inclined belt layers include at least two inclined belt layers having different tire widthwise widths;
an inclination angle θ 1 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the widest width and an inclination angle θ 2 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the narrowest width satisfy correlations that
30°≤θ 1 ≤85°,
10°≤θ 2 ≤30°, and
θ 1 >θ 2 ;

a tire widthwise width W 1 of the inclined belt layer having the widest width and a tire widthwise width W 2 of the inclined belt layer having the narrowest width satisfy a correlation that
W 2 ≤0.6W 1 ;

when the internal pressure of the tire is 250 kPa or more, a ratio of a sectional width SW to an outer diameter OD of the tire is 0.26 in the case where the sectional width SW of the tire is less than 165 mm, and the sectional width SW and an outer diameter OD of the tire satisfy a relation expression that OD≥2.135×SW+282.3 in the case where the sectional width SW of the tire is 165 mm or more,
the inclined belt layers consist of only the widest-width inclined belt layer and the narrowest-width inclined belt layer, and
the tire widthwise width W 3 of the circumferential belt layer is 90% or more and 115% or less of a tread width TW.

2. The passenger vehicle pneumatic tire according to claim 1 , wherein the tire satisfies a correlation that W 2 ≥0.25W 1 .

3. The passenger car pneumatic radial tire according to claim 1 , wherein the circumferential belt layer is disposed on the tire radial outer side of the inclined belt layers.

4. The passenger car pneumatic radial tire according to claim 1 , wherein the tire widthwise width W 1 of the inclined belt layer having the widest width is 90% or more and 115% or less of the tread width TW.

5. The passenger car pneumatic radial tire according to claim 1 , wherein the cords of the circumferential belt layer either are aramid cords or are hybrid cords of aramid and nylon.

6. The passenger car pneumatic radial tire according to claim 1 , wherein the circumferential belt layer includes two circumferential belt layer circumferentially continuous parts and on a circumferential outer side of the inclined belt layer, an axial end portion of one of the circumferential belt layer parts and the other circumferential belt layer part overlap in the tire radial direction at the tire equatorial plane so as to form a circumferentially continuous overlapping portion.

Assignees

• Bridgestone Corp

Inventors

• Kuwayama Isao

Classifications

• B60C9/2009 Primary

  comprising plies of different materials · CPC title

• B60C2009/2016

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

• Y10T152/10792

  Structure where each bias angle reinforcing cord ply has no opposingly angled ply · CPC title

• B60C9/22

  the plies being arranged with all cords disposed along the circumference of the tyre · CPC title

• B60C9/30

  asymmetric to the midcircumferential plane of the tyre · CPC title