| 摘要 |
PURPOSE:To keep the best rigid balance of a block so as to prevent unbalanced abrasion by drawing virtual lines from the position of obtuse angle formed by a couple of circumferential notch channel and inclined transverse channel with partition the block, and arranging a couple of notch channels on the center portion between the respective virtual lines. CONSTITUTION:The tread portion of a tyre is partitioned into numerous land portion lines 30 formed thereon by numerous circumferential main channels 10. And numerous blocks 40 are formed by each of the circumferential channels 10 and numerous inclined transverse channels 20 which face and intersect each of the circumferential main channels 10. On one block 404 for example, a couple of notch channels 50 is arranged from both sides toward the center of the block 40 in the respective center portions P1, P2 of the circumferential distance L1, L2 between respective virtual lines 70, 71 drawed parallel to the axial direction from the obtuse angle portions 60, 61 of each of the intersections where each of the circumferential main channels 103, 104 intersects each of the inclined transverse channels 204, 208. |
