| CPC B60C 11/0302 (2013.01) [B60C 11/0332 (2013.01); B60C 11/12 (2013.01); B60C 2011/0341 (2013.01); B60C 2011/036 (2013.01); B60C 2011/0381 (2013.01); B60C 2011/1213 (2013.01); B60C 2200/04 (2013.01)] | 14 Claims |
|
1. A pneumatic tire, comprising:
a plurality of first inclined main grooves that extend while inclining to one side with respect to a tire circumferential direction and open to a tire equatorial plane and a tire ground contact edge on the one side;
a plurality of second inclined main grooves that extend while inclining to an other side in the tire circumferential direction and open to the tire equatorial plane and a tire ground contact edge on the other side;
a plurality of first land portions that are defined by a pair of the first inclined main grooves adjacent to each other and by one of the second inclined main grooves, the plurality of first land portions extending from the tire equatorial plane to the tire ground contact edge on the one side; and
a plurality of second land portions that are defined by a pair of the second inclined main grooves adjacent to each other and by one of the first inclined main grooves, the plurality of second land portions extending from the tire equatorial plane to the tire ground contact edge on the other side,
the plurality of first land portions being arrayed adjacent to each other in the tire circumferential direction,
the plurality of second land portions being arrayed adjacent to each other in the tire circumferential direction,
the first land portions and the second land portions being arrayed in a staggered manner along the tire equatorial plane,
the first land portions and the second land portions each comprising a plurality of through grooves that extend therethrough and open to the pair of the first inclined main grooves or the pair of the second inclined main grooves respectively, and a plurality of blocks defined by the through grooves,
the plurality of through grooves having a straight shape and an inclination of all of the through grooves in each of the first land portions or the second land portions on a same side of the tire equatorial plane inclining toward a same direction with respect to the tire circumferential direction,
the blocks in each of the first land portions and the second land portions comprising center blocks, including an innermost center block that is defined as a block closest to the tire equatorial plane and an outer center block that is defined outward in a tire width direction of the innermost center block, and a shoulder block defined as a block closest to the tire ground contact edge,
the innermost center blocks comprising an edge portion that comprises a first notch portion opening to a connection portion of one of the first inclined main grooves or one of the second inclined main grooves,
in each of the first land portions and the second land portions, a ratio of a ground contact area of the innermost center block to a sum of ground contact areas of center blocks being in a range of 0.30 or more and 0.50 or less, wherein
the first notch portion in the innermost center block of the second land portions forms a terminating end of the first inclined main grooves, and the first notch portion in the innermost center block of the first land portions forms a terminating end of the second inclined main grooves,
the outer center block in each of the first land portions and the second land portions comprising an edge portion that comprises a second notch portion opening to a connection portion of one of the through grooves in each of the first land portions and the second land portions with one of the first inclined main grooves or with one of the second inclined main grooves,
an extension length Wn of the first notch portion of all of the innermost center blocks having a relationship 0.30≤Wn/Wb1′≤0.50 with respect to a width Wb1′ of the innermost center block at a position where the first notch portion is disposed, and
an extension length Wn of the second notch portion of all of the outer center blocks having a relationship 0.30≤Wn/Wb1′≤0.50 with respect to a width Wb1′ of the outer center block at a position where the second notch portion is disposed, the extension length Wn of the first and second notch portions being measured as an extension distance of the first and second notch portions in a direction of the width Wb1′ of the innermost and outer center blocks, and the width Wb1′ of the innermost and outer center blocks being defined as a maximum width of the innermost and outer center blocks in a direction orthogonal to an extension direction of the first and second inclined main grooves.
|