| 摘要 |
PROBLEM TO BE SOLVED: To provide a heavy duty pneumatic tire capable of improving partial wear resistance by making a raised bottom part in a lug groove, mitigating concentration of stress to the raised bottom part, and restraining generation of cracks caused by fatigue of tread rubber. SOLUTION: The raised bottom part 14 whose height is 30 to 80% of the depth of the lug groove 12 is formed in the groove.At least two sipes 15 extended to the length direction of the lug groove 12 are created at each raised bottom part 14.At least two sipes 16 are created at the position facing to the top of the raised bottom part 14 in each block 13.Alternatively, a groove wall angle of the lug groove 12 to the tread face is changed continuously from 80 to 90 degree to make the width of the lug groove 12 widest at the top of the raised bottom part 14. COPYRIGHT: (C)2004,JPO |
