OFF-ROAD PNEUMATIC TIRE

摘要

An off-road pneumatic tire has a tread having an outer surface forming a tread surface, the tread including a body and multiple blocks projecting from the body substantially outward in radial direction. The blocks have a center block group, a pair of shoulder block groups and a pair of middle block groups. The center group includes center blocks at interval in circumferential direction on plane of equator. Each shoulder group includes shoulder blocks at interval in the circumferential direction on an edge of the tread surface. Each middle group includes middle blocks at interval in the circumferential direction between the center and one shoulder groups. The center group has units each having first, second, third and fourth center blocks in the order of the first, second, third and fourth blocks in the circumferential direction.

主权项

1. An off-road pneumatic tire, comprising:
a tread having an outer surface forming a tread surface, the tread including a body and a plurality of blocks projecting from the body substantially outward in a radial direction, wherein the plurality of blocks has a center block group, a pair of shoulder block groups and a pair of middle block groups, the center block group includes a plurality of center blocks positioned at an interval in a circumferential direction on a plane of an equator, each of the shoulder block groups includes a plurality of shoulder blocks positioned at an interval in the circumferential direction on an edge of the tread surface, each of the middle block groups includes a plurality of middle blocks positioned at an interval in the circumferential direction between the center block group and one of the shoulder block groups, the center block group has a plurality of units each comprising a first center block, a second center block, a third center block and a fourth center block positioned in an order of the first, second, third and fourth center blocks in the circumferential direction, each of the units has an interval D1 from the first center block to the second center block such that the interval D1 is larger than an interval D2 from the second center block to the third center block and that the interval D2 is smaller than an interval D3 from the third center block to the fourth center block, the second center block has a width which is larger than a width of the first center block, and each of the first center block and the fourth center block comprises a single block comprising a large block and each of the second center block and the third center block comprises a twin block comprising two small blocks parallel-aligned in an axial direction such that the large big block has an area of a surface which is larger than an area of a surface of each of the small blocks.