| 摘要 |
PROBLEM TO BE SOLVED: To suppress falling of blocks in a pneumatic tire by satisfying specified relation between a twisting center axis in a radial direction of a tire, with a spacing between end faces of widthwise blocks, and satisfying specified relation between the twisting center axis in widthwise direction of the tire, with a spacing between an operation surface in a radial direciton of the tire and the bottoms of the sipes. SOLUTION: Sipes 24 each twisted by a specified angle from a surface part 28 to a bottom part 30 are arranged in a block 18. A rotary axis is arranged, in a plan view from an operation surface 26, within a range indicated by the following formula: 0.2W<=P1 <=0.8W from a side surface 20 to a side surface 22, where P1 is a position of the rotary axis in a plan view, W is width of the block 18 in a B direction. The rotary axis is arranged, in a side view from the side surface 20 from the operation surface 26 to the bottoms of the sipes in a C direction, within a range indicated by the following formula: 0.2F<=P2 <=0.6F, where P2 is a position of the rotary shaft in the side view, and F is the depth of the sipe 24 in the C direction. Rigidity of small blocks 18a to 18d is thus increased, while falling of the blocks 18a to 18d is prevented. |
