| 摘要 |
PURPOSE:To secure rationally the drain off power in circumferential direction and the drainage in lateral direction by forming center longitudinal grooves and longitudinal grooves arranged in a straight line and in the circumferential direction, and, by forming center lateral and shoulder lateral grooves crossing the line to the tire center obliquely. CONSTITUTION:Center blocks 21 are formed on the center of a tire being linked together over the full length of the circumference. Center lateral grooves 22, which obliquely cross the line to the tread center at an angle of alpha, are formed on both sides of this blocks 21 making zigzag patterns by shifting their phases in the circumferential direction. Longitudinal center grooves 23 are formed on both sides of the blocks 21 in a straight line over the full length of the circumference, and, side longitudinal grooves 24 are formed on the outer side of the longitudinal grooves 23, then, side lateral grooves 25 link the longitudinal grooves 23 and 24 mutually. Shoulder blocks 27 are formed on the outer side of the longitudinal grooves 24 and their shapes are represented by the longitudinal grooves 24 and shoulder lateral grooves 28, and besides, grooves 29 are formed at the outer side edges. |
