Heavy load tire

Patent metadata

Field	Value
Publication number	US-9789732-B2
Application number	US-201414762651-A
Country	US
Kind code	B2
Filing date	Feb 5, 2014
Priority date	Feb 6, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A first belt layer includes a cord extending at an inclination angle of greater than 45° with respect to the tire circumferential direction, a second belt layer includes a cord extending in the tire circumferential direction, and a third belt layer includes a cord extending at an inclination angle of 30° or less in the opposite direction from the cord of the first belt layer with respect to the tire circumferential direction. The belt layers are arranged in order, with the first belt layer furthest inward in the tire radial direction, on the outer circumferential side of a crown region of a carcass extending toroidally between a pair of bead portions. The third belt layer width w 3 is 80% or more of the tread width w, and w 2 <w 1 <w 3 , where w 1 is the first belt layer width, and w 2 is the second belt layer width.

First claim

The invention claimed is:

1. A heavy load tire comprising:
a first belt layer comprising a cord extending at an inclination angle of greater than 45° with respect to a tire circumferential direction;
a second belt layer comprising a cord extending either in the tire circumferential direction or a direction different from the tire circumferential direction by less than 10°; and
a third belt layer comprising a cord extending at an inclination angle of 30° or less in an opposite direction from the cord of the first belt layer with respect to the tire circumferential direction;
a carcass extending toroidally between a pair of bead portions; and
a tread rubber having a ground contacting tread width w between tread edges, wherein
the first belt layer, second belt layer, and third belt layer are arranged in order, with the first belt layer furthest inward in a tire radial direction, on an outer circumferential side of a crown region of the carcass,
a width w 1 of the third belt layer is 80% or more of the tread width w, and
w 2 <w 1 <w 3 , where w 1 is a width of the first belt layer, and w 2 is a width of the second belt layer,
wherein the carcass is directly adjacent to the first belt layer in the tire radial direction,
wherein the first belt layer is directly adjacent to the second belt layer in the tire radial direction,
wherein the second belt layer is directly adjacent to the third belt layer in the tire radial direction,
wherein the inclination angle of the cord in the third belt layer with respect to the tire circumferential direction is 25° or less,
the inclination angle of the cord in the first belt layer with respect to the tire circumferential direction is 55° or less, and
the width w 1 of the first belt layer is 100% or less of the tread width w, and
wherein the width w 1 of the first belt layer is 85% or more of the tread width w.

2. The heavy load tire of claim 1 , wherein the width w 3 of the third belt layer is 90% or more of the tread width w.

3. The heavy load tire of claim 1 , further comprising, outward in the tire radial direction from the third belt layer, a fourth belt layer comprising a cord extending at an inclination with respect to the tire circumferential direction.

4. The heavy load tire of claim 3 , wherein the cord in the fourth belt layer extends at an inclination angle in an opposite direction from the cord of the third belt layer with respect to the tire circumferential direction.

5. The heavy load tire of claim 4 , wherein the inclination angle of the cord in the fourth belt layer with respect to the tire circumferential direction is 70° or less.

6. The heavy load tire of claim 5 , wherein the inclination angle of the cord in the fourth belt layer with respect to the tire circumferential direction is 15° or more and 55° or less.

7. The heavy load tire of claim 3 , wherein the fourth belt layer has a width w 4 and the width w 4 of the fourth belt layer is 20% or more of the tread width w.

8. The heavy load tire of claim 7 , wherein the width w 4 of the fourth belt layer is 30% or more of the tread width w.

9. The heavy load tire of claim 3 , wherein the width w 4 of the fourth belt layer is less than the width w 2 of the second belt layer.

10. The heavy load tire of claim 3 , wherein the width w 4 of the fourth belt layer is 70% or less of the tread width w.

11. The heavy load tire of claim 10 , wherein the width w 4 of the fourth belt layer is 55% or less of the tread width w.

12. The heavy load tire of claim 1 , wherein the width w 2 of the second belt layer is 90% or less of the tread width w.

13. The heavy load tire of claim 12 , wherein the width w 2 of the second belt layer is 85% or less of the tread width w.

14. The heavy load tire of claim 13 , wherein the width w 2 of the second belt layer is 50% or more of the tread width w.

15. The heavy load tire of claim 1 , wherein the width w 3 of the third belt layer is 105% or less of the tread width w.

16. The heavy load tire of claim 1 , wherein the cord in the second layer extends in a wave pattern.

17. The heavy load tire of claim 1 , wherein the inclination angle of the cord in the third belt layer with respect to the tire circumferential direction is 10° or more.

18. The heavy load tire of claim 1 , wherein the inclination angle of the cord in the second belt layer with respect to the tire circumferential direction is 5° or less.

Assignees

• Bridgestone Corp

Inventors

• Mori Yosuke

Classifications

• B60C2009/229

  characterised by the course of the cords, e.g. undulated or sinusoidal · CPC title

• B60C11/04

  in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag (B60C11/12, B60C11/13 take precedence) · CPC title

• B60C9/2006 Primary

  consisting of steel cord plies only · CPC title

• B60C9/28

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

• B60C2200/06

  for heavy duty vehicles · CPC title