| CPC B60C 11/1236 (2013.01) [B60C 11/0306 (2013.01); B60C 11/1204 (2013.01); B60C 2011/1213 (2013.01); B60C 2011/129 (2013.01)] | 19 Claims |
|
1. A pneumatic tire comprising:
a center block row provided in a center area of a tread surface,
the center block row including a plurality of center blocks arranged along a tire circumferential direction; and
two inner main grooves, each located adjacent to a respective side in the tire width direction of the plurality of center blocks, wherein
the plurality of center blocks includes a plurality of first center blocks and a plurality of second center blocks arranged alternately along the tire circumferential direction,
the plurality of first center blocks and the plurality of second center blocks have convex polygonal shapes on the tread surface,
the convex polygonal shape formed by each second center block has a same number of sides as, but a different shape than, the convex polygonal shape formed by each first center block,
each first center block and each second center block has one or more sipes,
a number n of sipes included in each second center block is greater than a number m of sipes included in each first center block,
a longitudinal direction of each first center block is inclined to one side along a tire circumferential direction and to one side along a tire width direction,
a longitudinal direction of each second center block is inclined to the one side along the tire circumferential direction and to the one side along the tire width direction,
each second center block has a plurality of the sipes,
the plurality of the sipes include two sipes located on outermost sides in the tire circumferential direction,
one of the two sipes has a sipe depth that gradually increases from a first side to a second side in the tire width direction,
the other of the two sipes has a sipe depth that gradually increases from the second side to the first side in the tire width direction, and
each sipe included in each of the plurality of center blocks consists of:
a first sipe portion which opens to one of the two inner main grooves and extends toward the one side along the tire circumferential direction and toward the one side along the tire width direction;
a second sipe portion which opens to the other of the two inner main grooves and extends toward the one side along the tire circumferential direction and toward the one side along the tire width direction; and
a third sipe portion which extends toward a different direction from extend directions of the first sipe portion and the second sipe portion to connect the first sipe portion and the second sipe portion.
|