英语翻译To provide a pneumatic tire capable of enhancing the res

英语翻译
To provide a pneumatic tire capable of enhancing the resistance against groove cracking while the water draining performance and the resistance against rib tear are secured.A plurality of circumferentially stretching grooves 50 are formed at the tread surface 11 of this tire,and the groove bottom deepest part center 72 of that one of the grooves 50 which is located between a shoulder rib 41 and a second rib 45 is positioned nearer the second rib 45 than the center line 85 of the groove width W.The groove wall 61 on the side with shoulder rib is connected with the groove bottom deepest part 71 in that condition by the curved surface part 75 on the side with shoulder rib.The groove wall 65 on the side with second rib and the groove wall 61 on the side with shoulder rib are formed so that the angle α of a virtual extension part 80 as virtual tread surface 11 to the groove wall 65 on the side with second rib is smaller than the angle β of the virtual extension part 80 to the groove wall 61 on the side with shoulder rib.As a result,the resistance against groove cracking can be enhanced while the water draining performance and the resistance against rib tear are well secured.

要保证充气轮胎能够充分加强沟道韧性,就要确保其在进行排水时不会发生沟道破裂或挡边撕裂的情况.多数情况下,圆周拉伸沟道50是在该轮胎挤压胎面11处形成的.且在沟道底部的最深中心72（它属于沟道50的一部分）,它处于轴肩挡边41和第二挡边45之间,但被放置于更靠近第二挡边45的位置,而不是沟宽W中心线85的位置.与轴肩挡边处于一边的沟墙61被连接于沟底深中心71处,这样一来,弯面75就与轴肩挡边在一边了.定型与第二挡边处于一边的沟墙65和与轴肩挡边处于一边的沟墙61,这样,虚拟伸展部分80的α角度和沟墙65的虚拟挤压胎面11就小于沟墙61虚拟伸展部分80的β角度了.根据上述操作,就可以在沟道和挡边韧性得以保证的情况下,增强排水的性能.