Pneumatic radial tire having six block rows
AssigneeThe Yokohama Rubber Co., Ltd.
InventorTomoyuki Matsumura
Life of this patent
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Abstract
A pneumatic radial tire, wherein five main grooves extending in the circumferential direction of a tire are provided on a tread to divide into and form land portions of six rows, each land portion is divided into block rows constituted by a plurality of blocks by means of a plurality of subgrooves extending in the direction of width of the tire, and an area ratio of the blocks is set at a relationship of 1:0.9 to 1.1:1.8 to 2.2 from the block row of the shoulder side to the block row of the center side, in a region between ends of a belt layer having a maximum width embedded in said tread.
Claims7
A pneumatic radial tire, comprising:
- five main grooves provided on a tread and extending in a tire circumferential direction to divide the tread into six rows of land portions;
- and
- a plurality of subgrooves provided on the tread and extending in a tire width direction to divide each of the land portions into a plurality of blocks,
- wherein the tread consists of six block rows including a first block row at each shoulder side, a second block row adjacent to the first block row toward a center side and a third block row adjacent to the second block row toward the center side;
- wherein an area ratio of the blocks of the first block row to the blocks of the second block row to the blocks of the third block row is set at a relationship of 1:0.9 to 1.1:1.8 to 2.2 in a region between ends of a belt layer having a maximum width embedded in the tread;
- and wherein the ratio of a groove area to a tread area is set within the range of 15% to 35%.
Dependencies are inferred from the claim text.