| 摘要 |
PURPOSE: To attain high gripping force and shearing rigidity in all road surfaces by disposing a plurality of sipes whose plane shapes are of I shape over the whole surface of a tread other than a groove part closely to each other alternately longitudinally and latitudinally. CONSTITUTION: A plurality of sipes 2 whose plane shapes are of I shape over the whole surface of a tread other than a groove part are disposed closely to each other alternately longitudinally and latitudinally. The respective sipes 2, whose dimensions are small in the horizontal direction and whose side shapes are in a rectangle, are engraved deeply. The ends of the respective sipes 2 are formed into a hollow cylindrical shape 8, thus avoiding shear stress concentration, and assisting in improving the flexibility of hinge-shape jointed parts 7. The hinge-shaped jointed parts 7 are arranged in a zigzag form on any of longitudinal, lateral and diagonal block lines, so they work like an accordion curtain, tend to expand and contract easily in the horizontal direction, and generates large drag against lateral inclination, longitudinal crack and buckling, thus exhibiting high shearing rigidity.
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