Pneumatic tire

Patent metadata

Field	Value
Publication number	US-11072206-B2
Application number	US-201816233294-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Jan 17, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A pneumatic tire has a plurality of main grooves extending in a tire circumferential directions and a plurality of land lines defined by the plurality of main grooves, on a tread face. At least one of the plurality of land lines protrudes outward in a tire diametrical direction from a profile line. A void ratio of a first area positioned on one side of a center of a width of the at least one land line is larger than a void ratio of a second area positioned on the other side. A protruding height of the second area from the profile line is larger than a protruding height of the first area.

First claim

What is claimed is:

1. A pneumatic tire comprising:
a tread face;
a plurality of main grooves extending in a tire circumferential direction in the tread face; and
a plurality of land lines defined by the plurality of main grooves on the tread face,
wherein at least one of the plurality of land lines protrudes outward in a tire diametrical direction from a profile line,
a void ratio of a first area positioned on one side of a center of a width of the at least one land line is larger than a void ratio of a second area positioned on the other side of a center of a width of the at least one land line;
a protruding height of the second area from the profile line is larger than a protruding height of the first area,
wherein the at least one land line has a void-less area extending in the tire circumferential direction and
a position where the second area has a largest protruding height from the profile line is provided in a central portion of the void-less area in a width direction;
wherein a top face of the first area is formed in an arc shape protruding inward in the tire diametrical direction in a section along a tire meridian and a top face of the second area is formed in an arc shape protruding outward in the tire diametrical direction in the section along the tire meridian, and
an edge positioned on one side of the at least one land line is tapered outward in the tire diametrical direction.

2. The pneumatic tire according to claim 1 , wherein a height of an edge positioned on one side of the at least one land line is different from a height of an edge positioned on the other side of the land line.

3. The pneumatic tire according to claim 2 , wherein the height of the edge included in the second area is larger than the height of the edge included in the first area.

4. The pneumatic tire according to claim 1 , wherein the at least one land line is a rib having a notch open only on one side.

5. The pneumatic tire according to claim 1 , wherein the at least one land line is a center land line passing through a tire equator or a mediate land line positioned on an outer side of the center land line in a tire width direction.

6. The pneumatic tire according to claim 1 , wherein a top face of the first area and a top face of the second area are each formed in an arc shape protruding outward in the tire diametrical direction in a section along a tire meridian.

7. The pneumatic tire according to claim 1 , wherein the at least one land line has a notch, the notch having a first end open to one of the plurality of main grooves and a second end closed within the at least one land line, and
wherein the notch is not formed in the void-less area.

Assignees

• Toyo Tire & Rubber Co
• Toyo Tire Corp

Inventors

• Sakamoto Sachio

Classifications

• B60C11/03

  Tread patterns · CPC title

• B60C11/1376 Primary

  Three dimensional block surfaces departing from the enveloping tread contour · CPC title

• B60C2011/0381

  Blind or isolated grooves · CPC title

• B60C11/0306

  Patterns comprising block rows or discontinuous ribs · CPC title

• B60C11/0083 Primary

  characterised by the curvature of the tyre tread · CPC title