| 摘要 |
PURPOSE:To aim at enhancing the performance of a tire and preventing roads from being damaged, by forming cuts around spike driving holes in a several number formed in a tread section to locally relax the rigidity of the tread section so that the spikes are inclined only when force due to slip is brought about. CONSTITUTION:In a tire formed with a several number of driving holes 3 for planting spikes 2 on the tread section T of the tire, a plurality of cuts 4 are formed in the tread section T around the driving holes 3 to locally relax the rigidity of the tread section T. In this arrangement, the cuts 4 are arranged so that they are independent from each other and each driving hole 3, for example, intervanes between them in the fore-and-aft direction of the tread section T. Further, the shape of the cuts 4 is circular. Further more, the depth (h) of the cuts 4 is preferably in a range 25-50% of the depth H of the driving holes 5. Further, in the case of that the cuts 4 are arrayed annularly, the included angle (d) of each cut 4 is preferably less than 75 deg.., measuring from the center of the spike 2. |
