| 摘要 |
PURPOSE:To improve traveling performance of a heavy duty tire on ice and snow by providing sipes having orientation in the rotating direction and being inclined in the circumferential direction in a block of a tread central area from inner side to the outer end thereof so as to be opened to grooves. CONSTITUTION:A block 15 is partitioned by four circumferential grooves 13 formed in a zigzag shape and lateral grooves 14, thus block rows 16a to 16e being formed. In the block rows 16b to 16d in the central area, a plurality of trapezoidal sipes 18 having orientation in the tire rotational direction are formed so as to be opened to circumferential grooves 13. In this case, the sipes 18 in the block 16c are connected in the inner side 15a of the block 15 and the sipes 18 in the blocks 16b, 16d are spaced between each other, in the inner side of the block 15. With this arrangement, the sipes 18 are grounded in such a way that the sipes on the inner side 15a are grounded in advance, so that it is possible to improve cutting of water film and water discharge and also traveling performance on ice and snow. |
