| 摘要 |
PURPOSE:To make pattern noise into white noise as well as improve the uniformity by arraying plural block columns on the tire ground plane and plural pitches with different pitch lengths on the block columns respectively. CONSTITUTION:On the ground plane of a tire, at least two block columns A, B are placed along the tire circumference in the cross direction of the tire to the surface center line M of a tread. At least two kinds of pitches 1, 2 with different pitch lengths PL, PS are arrayed on the block columns A, B respectively. On the respective block columns A, B, the ratio of the length PL of the longest pitch 1 to the length PS of the shortest pitch 2 is set more than 1.30. The entire ground plane is divided equally into 12 in the tire circumference as well as the area ratio of the maximum area to the minimum area in the actual ground contact area of each partition is set less than 1.30. |
